Separation type air conditioner
Contents
1. 40 45 50 55 60 65 10 remote controller unit each comprise control means requiring DC power and in which one of said indoor unit and outdoor unit comprises a DC source device for supplying DC power to each of said control means the electric power of said DC source device being supplied through said two wire connection to the other of said indoor and outdoor units and to said remote controller unit 4 The separated unit type air conditioner as claimed in claim 3 in which said remote controller unit and said other of said indoor unit and outdoor unit in which said DC source device is not provided each comprise cir cuits for non polarizing signals received over said two wire connection 5 The separated unit type air conditioner as claimed in claim 4 in which each of said circuits for non polariz ing said signals comprises a full wave rectifier circuit 6 The separated unit type air conditioner as claimed in claim 3 further comprising direct current blocking means provided between said two wire connection and each of said first and second means 7 The separated unit type air conditioner as claimed in claim 3 in which said units which receive DC power from said DC source device each comprise filter cir cuits for receiving DC power from said two wire con nection and providing said DC power to said control means 8 The separated unit type air conditioner as claimed in claim 1 in which said first means carries data tr2. the microcomputer 201 outputs data to the transmitter 20F The data is modulated with a 50 KHz signal to produce the tone burst signal The tone burst signal after being amplified is applied through the DC blocking circuit 20E and the connecting terminals 20A and 20B to the control signal lines 113 The data is arranged as shown in FIG 11 to include a start bit 1 bit modulated with a frequency of 41 7 KHz followed by address bits 2 bits for specifying an address at a signal destination and data bits a predetermined number of bits As an example if the address bits specify the mi crocomputer 51 in the indoor electronic controller 5 the transmitting signal received through the control signal lines 113 and the connecting terminals 5A and 5B i e the receiving signal of the indoor electronic control ler 5 is applied to the receiver 5H through the full wave rectifier 5C after the DC voltage component has been removed by the DC blocking circuit 5G In the receiver 5H the signal is demodulated by a tone decoder imple mented for instance with a PLL phase synchronization IC The output of the receiver 5H is applied to the mi crocomputer 5I In the microcomputer 51 the levels 1 and 0 of the data bits of the above described data are inverted and the start bit and the address bits are added to the data bits thus inverted to provide new data which is returned to the microcomputer 201 in re mote controller 20 In th
3. control lines may be of a type used for ordinary low voltage wiring e It can be readily detected by periodic signal trans mission and reception between the microcomputers 201 51 and 151 whether or not the pairs of control signal lines 113 and 114 are short circuited or broken A counter measure against noise which may affect the control signal lines 113 and 114 will now be de scribed The control signals and the air conditioning data are transmitted between the units 1 10 and 20 through the lines 113 and 114 In an air conditioner of this type the lines 113 and 114 are usually installed adjacent to the power lines 101 and 102 and switches 25 40 45 65 8 and relays are used to control the inputs and outputs of these units Accordingly the transmission signals are liable to be adversely affected by noise from the power lines switches and relays as a result of which erroneous signals might be transmitted between the units In order to eliminate this difficulty it is necessary to employ error control at the time of signal transmission For this purpose an inversion return comparison system may be employed in the invention This system will be de scribed In this system the transmission data is provided ac cording to a modulation system as shown in FIG 10 The transmission data is composed of a start bit ST address bits AD for identifying the signal trans mitting unit and the signal receiving unit and d
4. each constituted by an insulating transformer having primary and secondary coils a photo coupler or a high pass filter 20F 5F and 15F are transmitters 20H 5H and 15H receivers 201 51 and 151 microcom puters 20J 57 and 15J clock circuits 20K an operation key input circuit 20L a display unit for displaying the 4 526 010 5 and off states of the power source tempera ture set for a room 5K and 15K sensor and switch input circuits 5L 15L control output circuits 15M a source unit composed of an AC power transformer a rectifier circuit and a constant voltage control circuit and Vo designates a DC source Each of the microcomputers 201 51 and 151 may be of a type TMS 1000 integrated circuit manufactured by Texas Instruments Co or an 8085AIC type manufac tured by INTEL Co The arrangement and operation of 10 such a microcomputer are described in the user s man ual MSC 85 TM User s Manual January 1978 pub lished by INTEL Co An on off switch 21 for starting and stopping the air conditioner and a room temperature setting unit 22 for setting a room temperature to a desired value are con nected to the operation key input circuit 20K The sensor and switch input circuit 5K operates to receive temperature signals from the sensors 7 and 8 in FIG 3 and to receive on off data from the switch 9 for detecting whether or not current is flowing for operat ing the motor 4 In the con
5. 3 is also an explanatory diagram showing the arrangement in FIG 2 in more detail In FIGS 2 and 3 reference numeral 1 designates an indoor unit 10 an outdoor unit 20 a re mote controller 101 a three phase or single phase electric power line coupled to the indoor unit 1 102 a three phase or single phase electric power line cou pled to the outdoor unit 10 105 refrigerant piping con nected between the indoor unit 1 and the outdoor unit 10 113 a pair of control signal lines connected between the indoor unit 1 and the remote controller 20 and 114 of a pair of control signal lines between the indoor unit and the outdoor unit The indoor unit 1 as shown in FIG 3 includes a heat exchanger 2 a line flow fan 3 for supplying air to the heat exchanger 2 a fan motor 4 connected to the power line 101 to rotate the fan 3 an indoor electronic control ler 5 for transmitting control signals through the pairs of control signal lines 113 and 114 to the remote controller 20 and an outdoor electronic controller and receiving control signals therefrom to control the on off opera tion of the fan motor 4 for instance The indoor unit further includes a partition 6 a suction air temperature controller 7 connected to the electronic controller 5 and a blowing air temperature sensor 8 connected to the electronic controller 5 The outdoor unit 10 includes a heat exchanger 11 a propeller fan 12 for supplying air to the heat exchanger 11 a fan moto
6. INN 30694 GNIS mode LIWSNVUL i WNOIS S OL SNI 132 ewa MOON N 3433334 i 02 OL LIWSNVYL X TWNOIS NAS yol 3413934 LINN Y OL TWNOIS gt 102 NI NO SI LZ HIM cl S Oz ONIN LINN G DEL Old TOHINO3 AN NOILINSODSY NOLLINDO93H NOI LINOOO3H 4 526 010 Sheet 6 of 7 U S Patent Jul 2 1985 5 M T SI NYJ 262 Nyd HOI 9015 HOOULNG 4 i NOLLIN90934 ISNI JOL OL 3531 193916 LINSNVYL ohn ISNI MEE FUEREN HIIM 1 WOOY SuVEWOD 51 Foe org JEL I 4 526 010 Sheet 7 of 7 U S Patent Jul 2 1985 71 WOI ZL 3015 gel 913 WNOIS S9GAWONYOV AMH OZ OL TYNOIS 9 0 LIWSNVYL S9GSIMONYOV LIWSNV YL 491 AAO OL IMONYOV LIWSNVYL EL 4 526 010 1 SEPARATION TYPE AIR CONDITIONER BACKGROUND OF THE INVENTION The present invention relates to an improved separat ed unit type air conditioner in which the compressor the heat exchangers the air blowing devices a
7. MARY OF THE INVENTION Accordingly an object of the invention is to elimi nate all of the above described difficulties accompany ing a conventional separated unit type air conditioner More specifically an object of the invention is to pro vide an improved separated unit type air conditioner 5 20 25 40 45 50 55 2 for which cables used for its control signal lines readily available and the wiring of the cables can be readily and correctly achieved without affecting the appearance of a house or room in which the air condi tioner is installed Another object of the invention is to provide an im proved separated unit type air conditioner in which transmission of control signals between plural units forming the air conditioner is carried out through a single pair of control signal lines A further object of the invention is to provide an improved separated unit type air conditioner which can be installed without taking into account the polarities of signal input terminals of a plurality of units forming the air conditioner and installed separately A still further object of the invention is to provide an improved separated unit type air conditioner in which even though a single pair of control signals is employed no data transmission and reception error is caused A particular object of the invention is to provide a separated unit type air conditioner in which a single pair of control signal lines i
8. United States Patent Sato et al 54 SEPARATION TYPE AIR CONDITIONER 75 Inventors Yasuo Sato Akio Fukushima Toshiro Kaise all of Shizuoka Yoshiyuki Honda Hyogo Kazuho Uemura Hyogo Manabu Fujii Hyogo all of Japan Mitsubishi Denki Kabushiki Kaisha Tokyo Japan 21 Appl No 258 492 22 Filed Apr 28 1981 130 Foreign Application Priority Data 30 1980 JP Japan 55 57427 Dec 2 1980 JP Japan 55 170160 51 Int F25B 49 00 52 SUIS Andenne 62 126 62 180 340 870 39 371 34 58 Field of Search 62 180 126 127 125 236 51 94 340 870 39 870 19 825 57 825 05 371 34 73 Assignee 56 References Cited U S PATENT DOCUMENTS 3 303 470 2 1967 Brixner et 340 825 57 3 562 729 2 1971 Hurd 340 870 39 3 717 858 2 1973 Hadden 340 870 39 11 Patent Number 4 526 010 4 Date of Patent Jul 2 1985 3 805 234 4 1974 371 34 4 127 845 11 1978 Dansbach et al 340 825 5 1 1980 Alsenz 236 51 OTHER PUBLICATIONS MCS 85 User s Manual Intel Corporation 3065 Bow ers Avenue Santa Clara Calif 95051 Jan 1978 Phase Locked Loop Data Book Exar Integrated Sys tems Inc P O Box 62229 Sunnyvale Calif 94088 Nov 1979 4 183 223 Primary Exam
9. and data receiving means for receiv ing data from the other units The outdoor unit includes an outdoor heat exchanger an air blowing motor an air blowing fan and a compressor As in the other two units the outdoor unit is provided with a single pair of 60 65 third connecting terminals The outdoor unit further includes third control means for receiving a signal from a temperature sensor to provide control outputs to drive the air blowing motor and the compressor data trans mitting means connected between the third connecting terminals and the third control means in this case the remote controller unit and the indoor unit and data receiving means for receiving data from the other units A single pair of control signal lines is electrically con nected to each of the first second and third connecting terminals through which data transmission and recep tion is carried out between the units 4 526 010 3 Each data transmitting means may include modula tor for high frequency modulating transmitted data on the control signal lines DC power source may be provided in one of the indoor unit and the outdoor unit for supplying DC power to each of the control means with DC power being supplied through the control signal lines to the other units In the one of the indoor and outdoor units in which the DC power source is not provided and in the remote control unit there are pro vided circuits for non polarizing the signal
10. ans mission again when said data has not been received correctly and when incorrect reception of data is de tected a predetermined number of times operates to stop operation of said air conditioner and to inform a user of an abnormal condition 9 A separated unit type air conditioner as claimed in claim 1 wherein each of said indoor unit outdoor unit and remote controller unit include both said first means and said second means 10 A separated unit type air conditioner as claimed in claim 9 said air conditioner including a temperature sensor for providing a temperature signal representing sensed temperature wherein said indoor unit includes an indoor heat exchanger an air blowing motor an air blowing fan and a first of said control means for receiv ing said temperature signal and providing a control output to drive said air blowing motor said outdoor unit includes an outdoor heat exchanger an air blowing motor an air blowing fan a compressor and a second of said control means for receiving said temperature signal and providing control outputs to drive said air blowing motor and compressor and said remote controller unit includes a power switch room temperature setting means and a third of said control means for receiving signals from said power switch and room temperature setting means to provide predetermined control out puts
11. ata bits DT DT which are obtained by encoding the con trol signal and air conditioning data as described above with reference to FIG 11 FIG 12 is an explanatory diagram illustrating a pro cedure of transmitting data from the unit 5 to the unit 15 The unit 5 transmits the start bit ST the address bits AD representative of the signal transmission to the unit 15 from the unit 5 and the data bits DT Upon reception of this signal the unit 15 returns to the unit 5 the data bits DT which are obtained by inverting the levels 1 and 0 of the data bits DT received to gether with the start bit and address bits AD indicat ing signal transmission to the unit 5 from the unit 15 If in this case the address bits AD are so set as to be the complement of 1 with respect to the address bits AD the return data can be obtained by inverting the levels 1 and 0 of all the bits except for the start bit In this manner data inversion can be readily achieved Then in the unit 5 the returned data and the original data transmitted therefrom are subjected to exclusive logical addition to check whether or not the transmis sion has been carried out correctly confirmation signal C is transmitted to the unit 15 to inform the unit 15 of the comparison result i e coincidence or non coincidence In the case of coincidence the unit 5 trans mits a coincidence signal to the unit 15 in response to which the uni
12. cular sets of program instructions What is claimed is 1 A separated unit type air conditioner having an indoor unit an outdoor unit and a remote controller unit which are provided at three different positions the improvement comprising communication means for transmitting information between any two of said units over a two wire connection said communication means comprising first means at a first of said any two units for transmit ting binary data onto said two wire connection together with a binary second address identifying data transmission to a second of said any two units second means at said second unit for inverting said second address to form a first address identifying data transmission to said first unit for inverting said data to form inverted data and for transmitting said first address and inverted data onto said two wire connection said first means comparing said data and inverted data to determine if said data was received correctly at said second unit 2 The separated unt type air conditioner as claimed in claim 1 in which each of said first and second means comprises a modulator for high frequency modulating wherein said binary data inverted data and first and second addresses are transmitted in the form of a high frequency modulated signal on said two wire connec tion 3 The separated unit type air conditioner as claimed in claim 1 wherein said indoor unit outdoor unit and _ 5 20 25 30 35
13. e remote controller 20 the data 4 526 010 7 thus returned is compared with original data trans mitted in response to which 1 bit signal is produced indicating that signal transmission and reception should be ended or signal transmission should be carried out again Each time the microcomputer 5I receives the 1 bit signal one data transmission and reception opera tion is completed In this manner microcomputer 51 supplies an output signal for instance to rotate or stop the fan motor 4 cf FIG 3 In the case also where the microcomputer 5I of the indoor electronic controller 5 or the microcomputer 151 of the outdoor electronic controller 15 operates as the signal transmitting side the operation is similar to that described above As described above according to the invention wir ing connections between the indoor unit 1 the indoor electronic controller 5 the outdoor unit 10 the out door electronic controller 15 and the remote controller 20 achieved with the pairs of control signal lines 113 and 114 only Suitable cables for the control signal lines 113 and 114 are readily available and the wiring can be readily and correctly achieved The use of such control signal lines is effective in that it is easy to insert them into a conduit tube when it is required to bury them in the wall of the room or house Furthermore the use of the control signal lines does not detract from appear ance of the room or ho
14. ed unit type air conditioner FIG 2 is an explanatory diagram showing the ar rangement of a preferred embodiment of a separated unit type air conditioner according to the invention FIG 3 is also an explanatory diagram showing the air conditioner in FIG 2 in more detail FIG 4 is a block diagram showing specific electrical circuits of a remote controller an indoor electronic controller and an outdoor electronic controller in FIG 3 FIG 5 through FIG 9 are explanatory diagrams illustrating various ways of connecting a pair of control signal lines FIG 10 is a diagram showing an example of a signal or a control signal transmitted mutually between the remote controller the indoor electronic controller and the outdoor electronic controller in FIG 4 FIG 11 diagram showing the arrangement of data in transmitting data according to a control system according to the invention FIG 12 is an explanatory diagram showing a proce dure of data transmission and FIG 13 is a flow chart and timing diagram indicating operations of microcomputers of controllers in the cir cuits of FIG 4 20 25 30 35 45 55 60 65 4 DESCRIPTION OF THE PREFERRED EMBODIMENTS preferred embodiment of the invention will be described with reference to FIGS 2 through 12 FIG 2 is an explanatory diagram showing the arrangement of an example of a separate type air conditioner con structed according to the invention FIG
15. hermostat and various protecting device not shown in the outdoor unit to the electronic controller in the indoor unit A multiconductor cable having ten to twenty conductors is employed for the control signal lines 103 and a multiconductor cable having five to ten conductors is employed for the control signal lines 104 However appropriate multiconductor cables espe cially the multiconductor cable having ten to twenty conductors used as the control signal lines 103 are not readily available commercially Even if a multiconduc tor cable is available the presence of the multiconduc tor cable may be rather unsightly The appearance of the house or room may be maintained unchanged by locating the cable in the walls of the house However in this case it is difficult to insert the cable into a conduit tube and accordingly the entire wiring operation is considerably difficult In addition the employment of the multiconductor cable for the control signal lines 104 increases the time required for the installation and is liable to cause errors in the wiring since it is laid be tween the indoor unit and the outdoor unit Furthermore the conventional air conditioner is dis advantageous in that where a sensor not shown is added to the outdoor unit in order to save energy or to control the air conditioner so that the occupants of the room feel comfortable at all times it is necessary to increase the number of control signal lines 104 SUM
16. iner Harry Tanner Attorney Agent or Firm Sughrue Mion Zinn Macpeak and Seas 57 ABSTRACT A separated unit type air conditioner including indoor outdoor and remote controller units all of which are provided at different locations Each of the units is provided with a single pair of connecting terminals to which a control device such as a microcomputer is coupled Data transmission between units is carried out on a single pair of connecting terminals utilizing a high frequency modulated signal DC power supply is provided in one of the indoor or outdoor units which supplies DC power to the other units upon the single pair of control lines 10 Claims 13 Drawing Figures U S Patent Jul 2 1985 Sheet 1067 4 526 010 FIG 1 PRIOR ART 101 REMOTE CONTROLLER 13 REMOTE CONTROLLER U S Patent Jul 2 1985 Sheet 2 of 7 4 526 010 Neo a a ee ee U S Patent Jul 2 1985 Sheet3of7 4 526 010 U S Patent 2 1985 Shet4of7 4 526 010 FIG 10 3msec 1 sec 1 O 0 1 0 1 1 0 1 aj DATA BITS ADDRESS a Bits FIG 1 START ADDRESS DATA BIT BITS BITS mm UNIT 5 ST AD DT TRANSMIT UNIT 15 TRANSMIT RECEIVE Aaen Ty PRANS INVERSION 8006 TRANS TRANS 4 526 010 Sheet 5 of 7 U S Patent 112 1985 481 913 SL L
17. nd the expansion valves are suitably and separately provided in an indoor unit and an outdoor unit and a remote con troller for these units is provided at a location different from those of the indoor and outdoor units A conventional air conditioner of this general type is shown in FIG 1 In FIG 1 reference numeral 1 desig nates an indoor unit 10 an outdoor unit 20 a remote controller 101 a three phase or single phase electric power line coupled to the indoor unit 102 a three phase or single phase electric power line coupled to the outdoor unit 103 control signal lines extending between the indoor unit 1 and the remote controller 20 104 control signal lines between the indoor unit 1 and the outdoor unit 10 and 105 refrigerant piping extending between the indoor unit and the outdoor unit In general in the conventional air conditioner a number of control signal lines 103 are laid between an electronic controller not shown including a mi crocomputer provided in the indoor unit and the remote controller 20 including various operating switches keys and light emitting elements for display In addition a number of control signal lines 104 are connected be tween the indoor unit and the outdoor unit which are used to control a compressor an air blower and various operating valves not shown in the outdoor unit using the outputs of the electronic controller in the indoor unit and to input the signals of a temperature control t
18. ol signals In this case a tone burst signal FIG 10 modulated with a 50 KHz signal is employed as the control signal The DC voltage of the DC source unit 15M is applied to the control signal lines 113 and 114 through the filter 15D However it is not applied to the inputs and out puts of the transmitters 20F 5F and 15F and the receiv ers 20H 5H and 15H as it is blocked by the DC block ing circuits 20E 5E and 15E and 20G 5G and 15G The DC voltage Vo is applied through the control signal lines 113 and 114 and the connecting terminals 20A 5A 20B and 5B to the electronic circuits in the remote controller 20 and the indoor electronic controller In this connection the connecting terminals 20A and 5A and 20B and 5B are non poliarized because of the provi sion of the full wave rectifiers 20C and 5C The trans mitting and receiving signals are removed by the filters 20D and 5D If necessary the DC voltage is applied after being made into a constant voltage The remote controller 20 is used to control the indoor and outdoor electronic controllers 5 and 15 or the indoor and outdoor units 1 and 10 at a distance The microcomputer 201 is operated according to the input which is set by the operation key input circuit 20K When the input set by the operation key input circuit 20 is changed or when a predetermined period of time has elapsed after an input change for instance when a per iod of time set by a timer not shown has elapsed
19. oller 20 and the outdoor electronic controller 15 or the outdoor unit 100 More specifically the control signal lines are con nected between the connecting terminals 20A 20B and 5A 5B and between the connecting terminals 5A 5B and 15A 15B in FIG 5 In FIG 6 the lines are con nected between the connecting terminal 20A 20B and 15A 15B and between the connecting terminals 15A 15B and 5A 5B In FIG 7 the lines are connected between the connecting terminals 20A 20B and 5A 15B In FIG 8 the lines are connected between the connecting terminals 20A 20B and 15B 5B and be tween the connecting terminals 5A 5B and 15B 15A In FIG 9 the lines are connected between the connect ing terminals 20A 20B and 5B 5A and between the 20 25 35 45 50 55 60 65 6 connecting terminals 5B and 15 158 The lines can be connected in other manners The operation of the circuits of the air conditioner as shown in FIG 4 will now be described The microcomputers 201 51 and 151 are driven by the clock circuits 20J 5J and 15J including ceramic oscilla tion elements The operation thereof is effected with inputs from the operation key input circuit 20 and the sensor and switch input circuits 5K and 15 the out puts to the display unit 201 the control output circuits 5L and 15L and the transmitting and receiving signals of the transmitters 202 5F and 15F and the receivers 20H 5H and 15H i e the contr
20. r 13 connected to the power line 102 to rotate the fan 12 a compressor 14 for compressing the refrigerant not shown which flows between the in door unit 1 and the heat exchanger 2 through the refrig erant piping 105 an outdoor electronic controller 15 for transmitting control signals to the indoor electronic controller 5 and to the remote controller 20 through the pairs of control signal lines 113 and 114 and receiving control signals therefrom to control the on off opera tions of the fan motor 13 and the compressor a capillary tube 16 and a heat exchanger refrigerant temperature sensor 17 and an outdoor air temperature sensor 18 which are connected to the electronic controller 15 As is apparent from FIGS 2 and 3 in the air condi tioner of the invention transmission and reception of the control signals between the indoor unit 1 the out door unit 10 and the remote controller 20 are carried out through the pairs of control signal lines 113 and 114 FIG 4 is a block diagram showing examples of spe cific circuits of the remote controller 20 the indoor electronic controller 5 and the outdoor electronic con troller 15 in FIG 3 In FIG 4 reference characters 20A 5A and 15A and 20B 5B and 15B designate the connecting terminals of the pairs of control signal lines 113 and 114 respectively 20C and 5C are full wave rectifiers 20D 5D and 15D are filters 20E 5E and 15E and 20G 5G and 15G designate direct current blocking circuits
21. s received on the respective connecting terminals to which the con trol signal lines are connected This is preferably imple mented by full wave rectifier circuits Direct current blocking means is then provided at the connecting ter minal sides of the data transmitting means and the data receiving means of each of the units Filter circuits may be also provided in each of the units To transmit data between any two of these three units the first second and third control means perform an inversion return comparison in which for data trans mission and control a data receiving side returns data by inverting logic levels 1 and 0 of the received data The data transmitting side then compares the data thus returned with the original transmitted data and outputs one of a coincidence signal and non coinci dence signal according to the results of the comparison When a transmission error is detected a predetermined number of times the control means operates to stop operation of the air conditioner and to inform the user of the abnormal condition The foregoing objects and other objects as well as characteristic features of the invention will become more apparent from the following detailed description and the appended claims when read in conjunction with the accompanying drawings BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings FIG 1 is an explanatory diagram showing the ar rangement of a conventional separat
22. s used to supply electric power from a DC source provided in one of the indoor unit and outdoor unit to the other and to a remote con troller In accordance with these and other objects of the invention there is provided a separated unit type air conditioner having an indoor unit an outdoor unit and a remote controller unit which are provided at three different locations The remote controller unit includes a power switch and a temperature setting means The remote controller unit is provided with a single pair of first connecting terminals first control means for re ceiving signals from the power switch and the room temperature setting means to provide predetermined control outputs data transmitting means connected between the first control means and the first connecting terminals to transmit data to the other units in this case the indoor unit and the outdoor unit and data receiv ing means for receiving data from the other units The indoor unit includes an indoor heat exchanger an air blowing motor and an air blowing fan The indoor unit is provided with a single pair of second connecting terminals second control means for receiving a signal from a temperature sensor to provide a control output to drive the air blowing motor data transmitting means interconnected between the second control means and the second connecting terminals to transmit data to the other units in this case the remote controller unit and the outdoor unit
23. t 15 carries out the control operation according to the data which has been previously re ceived On the other hand in the case of non coinci dence the unit 5 transmits a non coincidence signal to the unit 15 and then transmits data again When the unit 15 receives the non coincidence signal the previously received data is eliminated from the unit 15 and the unit 15 is maintained in the previous state until data is trans mitted thereto from the unit 5 If the data transmission error is present repeatedly more than a predetermined number of times there may be a problem such as a short circuit or breakage of the signal lines In this case the air conditioner is stopped and for instance a lamp is turned on to inform the user of the occurrence of trouble The inversion return comparison system has been described with respect to the units 5 and 15 However it is similarly applicable to other combinations of the units including the remote controller As is apparent from the above description in the inversion return comparison system of the invention it is unnecessary to add error detection bits to the trans mitting and receiving data and the error check can be achieved merely by calculating the exclusive logical sum of the data Thus the procedure is simple and yet the reliability of data transmission is very high Further more the system is advantageous in that the inversion 4 526 010 9 operation can simplified by se
24. trol output circuit 5L the output is applied to a relay coil to turn open and close the relay contacts thereof to control thereby the operation of the fan motor 4 as shown in FIG 4 The sensor and switch input circuit 15 operates to receive temperature signals from the sensors 17 and 18 in FIG 3 and to receive on off data from a high voltage or overcurrent detecting switch 19 for detecting whether or not the air conditioner is operating nor mally The output of the control output circuit 15L is ap plied to two relay coils as seen in FIG 4 so that the operations of the fan motor 13 and the compressor 14 are controlled according to the on off operations of the relay contacts Each of the receivers 20H and 15H may a type XR 567 integrated circuit manufactured by EXAR Co The arrangement and operation of the receiver are described in a publication entitled Phase Locked Loop Data Book November 1979 published by that com pany In the transmitters 20F 5F and 15F the digital sig nal s high level is modulated with a high frequency transformer not shown so that it can be properly re ceived by the receiver The above described pairs of control signal lines 113 and 114 can be connected in various manners as shown in FIGS 5 through 9 In these figures reference nu meral 115 designates a pair of control signal lines which instead of one pair of control signal lines 113 and 114 are connected between the remote contr
25. tting address bits described above As the transmission data and the in verted return data use the same format the data trans mission and the data inversion and return operations can incorporated into the same procedure In general the air conditioner of this type employs an ordinary 4 bit 1 chip microcomputer the program memory capacity of which is usually 1 000 to 2 000 bytes In order to im prove comfort and security and to economically use energy the data transmitting and receiving program s capacity is greatly limited Thus if the transmission error control according to the inversion return compar ison system having the above described effects or mer its is applied to the air conditioner as described above a two wire system separated unit type air conditioner control system can be implemented without a corre sponding lowering in the comfort level afforded by the system In FIG 13 is a flow chart and timing diagram show ing in detail the operations of the microcomputer 201 51 and 151 of the controllers 20 5 and 15 respectively as described above To program the microcomputers 201 5 and 151 the information from the flow chart can be translated directly into program steps with the precise form of the steps of course being determined by the particular type of microcomputer chosen Program steps of a conventional nature may further be included if desired and the invention is not limited to the use of any parti
26. use The embodiment of the invention shown in FIG 4 has the following additional effects a Since the connecting terminals 20A and 15 and the connecting terminals 20B 5B and 15B are non polarized no polarity wiring error can occur b As wiring of the pairs of control signal lines 113 and 114 between the connecting terminals 20 and 15 and the connecting terminals 20B 5B and 15B can be carried out in various combinations as shown in FIGS 5 through 9 the degrees of freedom in the instal lation position of the remote controller are large There fore during inspection and maintenance for instance the remote controller 20 can be moved near the outdoor unit 10 the outdoor electronic controller 15 for rewir ing or to test the mutual operation thereof with ease and with high accuracy c Many pieces of information data can be transmit ted and received without increasing the number of con trol signal lines 113 and 114 d As direct current is supplied to the remote con troller 20 from the DC source unit 15M of the indoor or outdoor electronic controller 5 or 15 it is unnecessary to provide a power source for the remote controller 20 thereby permitting miniaturization of the remote con troller 20 In this case the pairs of signal control lines 113 and 114 are used to feed direct current to the remote controller 20 However it is unnecessary to increase the maximum voltage rating of these lines as the signal
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