Power window switch which incorporates express up/down and
Contents
1. e detecting changes in the impedance of said transducer f generating an electrical control signal indicative of said changes in impedance and g modulating a driver signal with said control signal and applying said driver signal to said motor and energizing said motor and varying the motor speed according to the level of modulation of said driver signal 9 The method defined in claim 8 wherein said step of energizing said motor includes latching said motor on at maximum speed when said impedance is decreased below a predetermined threshold 10 A variable speed vehicle window power lift system comprising a a force transducer responsive to increasing user manual pressure on an input member to provide a decreasing electrical impedance b circuit means connected to an onboard vehicle power source and operative to produce a control signal indica tive of said decreasing impedance c a power switching circuit connected to an onboard vehicle power source and having its input connected to receive said control signal and operative to provide a power signal modulated according to said control sig nal d a moveable vehicle window including structure oper able for guiding window movement e a bi directional motor and lift linkage connected to said window and driven by said motor said motor operative upon energization by said power signal to lower and raise said vehicle window wherein said motor is increased in sp2. 6a which acts upon a bar 34 which presses on devices 26 28 Alternatively the devices 26 28 may be acted upon directly by the user s finger as shown in FIG 6b It will be under stood that other types of actuators may be employed as for example by eliminating rocker 30 and applying user force directly to bar 34 In one embodiment of the invention devices 26 28 comprise a force sensitive resistive device which provides decreasing electrical resistance with increasing pressure from bar 34 In another embodiment of the invention as will be described hereinafter in greater detail a variable capaci 5 857 061 3 tor is employed to provide an increased capacitance with increased force input The force versus impedance signal characteristics of the devices 26 28 are indicated graphically at 36 in FIG 2 Referring to FIG 2 The devices 26 28 are connected along line 38 to a voltage divider network 40 The voltage divider network 40 is operative to sense the variable imped ance of the devices 26 28 and to convert it to a voltage signal increasing with force as indicated graphically at 44 and provided at the output line 46 A low level force signal is indicated at 44 and a high force level signal is indicated at 44 in the graphical representation of the voltage 44 The output of the voltage divider 40 is connected along line 46 to the input of the comparator 48 which receives at another input along line 42 the output of a triang
3. and when installed would have an appear ance similar to that shown in FIGS 6a and 6b The embodiment 100 is formed by substitution for the voltage divider 40 in the system of FIG 2 the circuit shown in FIGS 7a and 7b when the variable impedance devices 26 28 comprise a force sensitive variable capacitance switch Referring to FIGS 7a and 7b the circuit receives power at connector terminals 71 and provides through capacitor network comprising capacitors C5 through and the power supply voltage V at 5 volts DC The variable capacitance type devices 26 28 of the embodiment 100 are connected from line 38 at terminals J2 The output signal 44 from the voltage divider 40 comprising a voltage propor tional to force applied to the capacitive switch devices 26 28 is connected through terminal J3 along line 46 to the input of comparator 48 The impedance of the force sensitive capacitor devices 26 28 is measured in a voltage divider circuit The voltage divider is comprised of a reference capacitor C3 and the switch 26 28 capacitor to be measured connected in series The capacitors are simultaneously charged and the voltage at the point where the capacitors are connected together junction 102 indicates the impedance of the capacitor of the devices 26 28 The logic uses a four step process to measure the capacitive impedance Device U1 comprises a square wave oscillator which provides an output at pin 3 thereof to the input
4. time to prevent overrunning of the desired window position Thus in this mode of operation it has been desired to have a slower rate of raising and lowering to enable accurate window positioning On the other hand when it is necessary to provide an immediate raising or lowering of the window for example to prevent intrusion or entry of wind smoke dust or rain it is desired to retain the higher rate of raising or lowering It thus has been desired to provide a way or means of varying the rate of raising or lowering vehicle windows which is simple and easy for the operator to use and of course a way to accomplish this function which is low in cost and easily installed in mass production of vehicles BRIEF SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle powered window lift control system which has a variable rate of raising and lowering the vehicle windows and which is readily and easily controllable by the vehicle operator It is a further object of the present invention to provide a variable vehicle powered window lift system which has the rate of raising or lowering increased by the vehicle operator pressing on a button or control input device or switch with greater force It is a further object of the present invention to provide a variable vehicle powered window lift control system in which the rate of raising and lowering of the window is increased by the operator changing the impedance
5. 2 N 2 3 N3 y 0973 4 N5 0915 N6 OUT6 TiN T7 GND op 1 5 857 061 Sheet 5 of 9 Jan 5 1999 U S Patent 820 NMOG In t 914 90A 2I 20 21 99 Vin YOLVYUVIWOD sn AV 139 H3WIL NO H21V1 en ven df H21V1 UOL1VBVdWOO NOILINAS SS3UgX3 U S Patent Jan 5 1999 Sheet 6 of 9 5 857 061 NORMAL FUNCTION WINDOW MOVES UP WI NDOW MOVES DOWN O EB SSES yea 0 ND E gd D PE ae Se aes JN7O copo 1 21 2 Er U7A 1 0 2 01 13 O 1 eere f 0787 0 eremum UIW O FIG 5q WINDOW MOVES UP WINDOW MOVES DOWN JN7O xad nT ol i APPROX Ul 14 OH s o SEC JN80 7 0 6 3 APPROX MEE Sg 3 0 SEC U4 2 l APPROX APPROX JN84 O 30SEC 3 0 SEC 1 EXPRESS FUNCTION FIG 5b U S Patent Jan 5 1999 Sheet 7 of 9 5 857 061 100 A m U S Patent Jan 5 1999 Sheet 8 of 9 5 857 061 JI 5 857 061 Sheet 9 of 9 Jan 5 1999 U S Patent 8 914 236 TY 3wil 096 Occ ooe 0 2 2 081 061 06 09 o 5 857 061 1 POWER WINDOW SWITCH WHICH INCORPORATES EXPRESS UP DOWN AND WINDOW MOTOR SPEED CONTROL FEATURES USING A FORCE SENSITIVE RES
6. 30 associated with the individual device Alternatively the driver may apply finger pressure directly to the devices 26 28 as shown in FIG 6b Such force sensitive resistance devices are known and commercially available such as that supplied by Interlink Electronics Inc Camorillo Calif and shown and described in U S Pat No 5 302 936 Referring to FIGS 3a and 35 the signal processing of the circuitry is set forth below with respect to various modes of operation of the powered window lift system of the embodi ment 10 As applied pressure increases on PID 1 or PID 2 the voltage at junction 68 increases U 2 amplifies this signal and produces an increasing voltage at U8B 5 This signal combined with the output from the 1 kHz triangle wave oscillator inputted at USB 6 yields a pulse width modulated signal at U8b 7 This voltage controls the duty cycle of the signal produced at U 8 B 7 Then this PWM signal controls the gate of the U 9 Mosfet producing this same signal at U 10 5 This PWM signal is seen on the relay at U 10 5 Also this PWM signal is seen by the motor and the speed will increase proportionately in response to the applied PID pressure and the window speed controlled by the motor speed will follow exactly When PID1 is pressed the voltage at junction 70 decreases proportionately with the applied force When this 10 15 35 40 45 50 55 60 65 4 voltage falls below Vlpgr which in the pr
7. ISTOR OR CAPACITOR BACKGROUND OF THE INVENTION The present invention relates to an automotive control device and in particular a control employed on a vehicle to enable the vehicle operator to control servo motors operative to raise and lower the windows in the vehicle Typically motor vehicles have a pushbutton or rocker actuated switch provided on a console commonly mounted on the inside of the door to enable the vehicle operator or passengers to selectively activate motors for raising or lowering a particu lar window or any combination of windows The window motors are each activated by a relay energized by the operator pushing the button on the console Heretofore with relays energizing the window motors the motor could only be operated at full voltage from the onboard vehicle power supply or left in the off state e g the switch was on off device It has been desired to provide a way or means of providing a variation in the speed or rate at which a window is raised or lowered Where it is desired to set the window at a certain position or opened only a relatively small amount for providing a desired amount of ventilation it has been found difficult to accurately position the window because of the relatively high rate at which the motor raises and lowers the window In such instances the vehicle operator or passenger as the case may be would experience difficulty in energizing the motor for a sufficiently limited
8. US005857061A TRIANGLE WAVE United States Patent Patent Number 5 857 061 Chang et al 4 Date of Patent Jan 5 1999 54 POWER WINDOW SWITCH WHICH 56 References Cited INCORPORATES EXPRESS UP DOWN AND WINDOW MOTOR SPEED CONTROL PON FEATURES USING SENSITIVE 3 710 050 1 1973 Richards 180 111 RESISTOR OR CAPACITOR 3 830 018 8 1974 Arai et al 49 28 DXX Primary Examiner David Martin Attorney Agent or Firm Roger A Johnston Pier Milwaukee James E Hansen 57 ABSTRACT Oak Creek Ruth E Hubbell Milwaukee Lewis J Gohde Sussex Asystem for enabling a vehicle operator to control the speed Edward J Waisatosa orrate of raising and lowering of a powered lift window The Richard p Baumann Franksville actuator or switch includes a pressure responsive variable Peter J McGinnis B 25 okfield one impedance device comprising a variable resistance in one M Klumb Richfield all of Wis embodiment and a variable capacitance in another embodi ment Increasing force directly on the variable impedance 73 Assignee Eaton Corporation Cleveland Ohio device by the user s finger or an actuator decreases the impedance which is sensed by a voltage divider which outputs a voltage which increases with increasing force This 21 Appl No 789 048 latter voltage is compared with the output of a triangle wave 22 Filed Jan 28 1997 o
9. ator FIG 6b is a view of the force sensitive variable imped ance switch directly actuated by the user FIG 7a is the left hand portion of an electrical schematic divided along parting line A A of an alternate embodiment of the invention of FIG 2 employing a variable capacitance FIG 7b is the right hand portion of the schematic of FIG 4a divided along parting line A A and FIG 8 is a timing diagram for the outputs of the various devices of the circuit of FIGS 7a and 7b DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS 1 6a and 6b the system of the present invention is indicated generally at 10 and has a control console 12 on a vehicle door 14 with a window 16 raised and lowered in tracks 18 20 by motorized mechanism indi cated generally at 22 connected to a window channel 24 At least one and typically for a driver s door a plurality of user input controls or variable impedance devices 26 28 are provided on console 12 Each of the devices indicated generally at 26 28 may have an actuator 30 which is directly acted upon or receives a force input from the vehicle operator or driver s hand or fingers such as for example a pushbutton type not shown actuator provided on the con sole 12 The actuator 30 imparts a force on one of the pressure responsive variable impedance devices 26 28 situ ated on a base or supporting structure 32 which forms a part of console 12 A rocker type actuator 30 is shown in FIG
10. eed as said user s manual pressure on said input member increases and f timing means operative to latch said motor on at maximum speed when said impedance is decreased below a predetermined threshold 11 The system defined in claim 10 wherein said timing means is operative to latch said motor for a predeter mined time period
11. esent practice of the invention is chosen as 9 volts the relay comparator 72 Is activated U 7 A 1 goes high and U 1 13 goes low thus energizing U 10 relay coil 78 through pin 7 thereof The motor speed responds to the PWM signal and the window moves up at a speed determined by the amount of force applied at the PID The motor speed increases with increas ing duty cycle When the voltage at junction 70 falls below V 25 which in the present practice of the invention is chosen as 5 volts the express function comparator 74 is activated the output of U 3 A 1 goes low then the timed latch on function 76 is energized US timing sequence starts pro ducing a 12 volt pulse of a 3 second duration at U 5 3 This inverts at U 1 14 and energizes the U 10 relay coil 78 at pin 7 In addition that signal from U 3A pulls the diode D5 low and starts another timing sequence out of U 4 3 of a 3 second duration This signal then gates the U 9 Mosfet for that 3 second duration When Mosfet is on the signal at U 10 5 is grounded Therefore a full 12 volts is applied across the motor leads yielding maximum win dow speed in the up direction thus the express up mode is activated Referring to FIG 4 when U 9 grounds pin 5 of relay U 10 one side of the motor is at ground potential at one of pins 1 and 8 of U 10 and if either up coil 78 or down coil 80 is energized by U 1 full voltage is then applied fro
12. le and hold circuit and U6 drives J3 as a low impedance load without discharging C4 When STB C is high five volts is applied in pin 12 of US and US outputs to C4 STB C is high when STB B is high because U4 forms a set reset latch The next clock pulse toggles U2 to reset to 0 0 C4 is a storage element and stores the voltage generated by the force on the capacitive devices 26 28 and thus provides an output proportional to the force Referring to Table II the states of the devices are shown for the four states 0 0 0 1 1 0 and 1 1 of U2 The timing of the outputs of the various devices of the circuit of FIGS 7a and 7b is illustrated in graphical form in FIG 8 TABLE II FIGS 7a amp 7b Ur Ur Us STB A 5 STB C Lo 00 Y4Lo 5 6 Hi Hi Lo Lo 01 510 13 Hi Lo Hi Lo 5 857 061 7 TABLE II continued FIGS 7a amp 7b U2 U3 05 STB A STB B STB C lo 1 0 Y6 Lo 12 Hi Lo Hi Hi lo 14 Y7 Lo Lo Lo Lo The values of capacitance resistance and the device type designations are given in Table III for the circuit of FIGS 7a and 7b TABLE III FIGS 7a amp 7b R Ohms C ufds U Type 1 10K 5 1 001 50 v 1 LM 555 2 10K 590 2 01 50v 2 74HC163 3 150 pf 50 v 3 74HC138 4 01 50v 4 74HC00 5 10 35 5 74HC4066 6 1 50 v 6 TLC272 7 1 50 8 1 50v 9 1 50v 10 1 50 11 1 50 v The present invention thus provides a simple and effective relatively l
13. le wave oscillator 50 having an output as shown graphically at 52 in FIG 2 The output of the comparator 48 along line 54 is indicated graphically as a series of pulses shown in solid outline at 56 for the voltage signal 44 for a low force input and in dashed line at 58 for the voltage signal 44 for a high force input as compared with the output signal 52 of the triangle wave oscillator The output of this variable imped ance devices 26 28 is thus converted to a pulse modulated PWM signal The output of the comparator 48 along line 54 is con nected to the input of a power driver device or driver 60 such as a Mosfet device which provides a modulated driver signal along its output line 62 to a bi directional motor relay 64 which operates the window lift motor 66 Referring to FIGS 3a and 35 in the embodiment 10 of the invention the variable impedance devices 26 28 comprise separate variable resistance force sensitive resistors PID1 and PID2 comprising resistors R1 and R2 respectively connected in parallel and having the resistance values R1 R2 in the present practice of the invention of about 3 4 kilo ohms in the fully actuated state i e with maximum force applied thereto Devices PID1 and PID2 are preferably formed of force transducer ink with polymer film conduc tors Referring to FIG 6a the devices 26 28 have a force impressed thereon by switch actuator 34 and rocker 12 upon the driver pushing on the rocker actuator
14. m pin 4 of U 10 to the opposite side of the motor through the other of pins 1 and 8 When PID 2 is pressed the voltage at junction 80 decreases proportionately with the applied force When this voltage falls below V 1 i e 9 volts the relay com parator 72 i e U 7 B 7 goes high and U 1 11 goes low thus energizing U 10 relay coil 80 through pin 2 thereof The motor polarity is thus reversed the motor speed responds to the PWM signal from U 9 and pin 5 and the window moves down at a speed determined by the amount of force applied at the PID The motor speed increases with increasing duty cycle When the voltage at junction 80 falls below V 2 which in the present practice of the invention is chosen as 5 volts then comparator 74 by U 3 B sends out a pulse triggering the U 6 timing sequence of 3 second duration This signal inverts at U 1 10 and energizes the U 10 relay coil 80 for that 3 second duration In addition that signal from U 3 B 7 pulls the diode D6 low and starts another timing sequence out of U 4 3 of a 3 second duration This signal then gates the U 9 Mosfet for that 3 second duration When Mosfet is on the signal at U 10 5 is grounded grounding one side of the motor through pin 8 Therefore a full 12 volts is applied across the motor leads through pin 1 of U 10 yielding maximum window speed in the down direction thus the express down mode is activated The timing of the outpu
15. ng window movement and e a bi directional motor and a lift linkage connected to said window and driven by said motor said motor operative upon said energization to lower and raise said vehicle window wherein said motor is increased in speed as said user s finger pressure on said input member increases 10 15 25 30 35 40 45 50 55 8 2 The system defined claim 1 wherein said control signal is pulse width modulated 3 The system defined in claim 1 wherein said window motor includes a bi directional relay 4 The system defined in claim 1 wherein said amplifier includes a Mosfet device 5 The system defined in claim 1 wherein said force transducer includes a polymer film with carbon interspersed therein and said decreasing impedance comprises decreasing resistance 6 The system defined in claim 1 wherein said decreasing impedance comprises generating increasing capacitance 7 The system defined in claim 1 wherein said force transducer provides a decreasing resistance 8 A method of varying the speed of raising and lowering vehicle powered window lift comprising a guiding a vehicle window for movement in a generally vertical direction b engaging said window with lifting structure c connecting said lifting structure to an electrically energized motor d providing a force transducer and decreasing the impedance thereof in response to increasing user applied force thereto
16. of a counter device U2 which counts for valid states and then repeats The outputs QA and QB of U2 are inputted to a one of eight decoder U3 such that when the most significant bit goes high QA and drive the least significant bit and it rotates through states 4 5 6 and 7 by forcing them low 10 15 20 25 30 40 50 55 60 65 6 The four steps of the process are generated by the fol lowing digital logic Oscillator U1 provides a clock pulse to the counter U2 The first two outputs of the counter which counts in binary from zero to three are connected to the first two inputs of U3 a 3 8 decoder which generates four separate sequential pulses The first and third pulse are inverted by U4 and labeled STB A and STB C on the schematic The second and fourth pulses set and reset respectively a flip flop formed by the two remaining gates of U4 This generates the charging control pulse labeled STB B on the schematic In the first step of the impedance measuring process control pulse STB A activates analog switches in U5 which are connected to both ends of the capacitor divider This causes both capacitors to be completely discharged In the second step the signal STB A is off and STB B is on The analog switches discharging the divider are now off and the STB B signal activates the analog switch in 1 5 which connects five volts to the capacitor divider thus charging the capacitors In
17. of the input device or switch by increased pressure The present invention employs in one embodiment a device which employs variable resistance sensitive to the applied force which resistance is decreased by the user manually pressing harder or with greater force on the input 10 15 20 40 45 50 55 60 65 2 device or switch which change in resistance is electrically detected to modulate the speed of the powered window lift motor In another embodiment increasing user pressure on the input device or switch increases the capacitance of the force sensitive switch which is electrically detected to modulate the window lift motor speed BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a diagram of the powered window lift control system of the present invention installed in a vehicle door FIG 2 is a block diagram of the system of FIG 1 employing a force sensing variable resistive switch FIG 3a is the lefthand portion of an electrical schematic of the system of FIG 2 divided along parting line A A FIG is the righthand portion of the schematic of FIG 3a divided along parting line A A FIG 4 is a schematic of the motor relay for the system of FIG 2 FIG 5a is a timing diagram of the output of various circuit components of FIGS 3a and 35 FIG 5b is a timing diagram similar to FIG 5a for the express function FIG 6a is a view of the force sensitive variable imped ance switch with actu
18. ow cost technique for enabling the vehicle opera tor to control the rate or speed of raising or lowering of a vehicle powered window lift by the amount of pressure or force the operator applies to the switch or rocker button typically located on a console on the vehicle door The user input device utilizes a pressure responsive variable impedance switch or input device which in one embodiment comprises a pressure sensitive variable resistance device and in another embodiment comprises a pressure responsive variable capacitance Although the present invention has been described here inabove with respect to the illustrated embodiments it will be understood that the invention is capable of modification and variation and is limited only by the scope of the following claims We claim 1 A variable speed vehicle window power lift system comprising a a force transducer responsive to increasing user finger pressure on an input member to provide a decreasing electrical impedance b a signal generating circuit connected to an onboard vehicle power source and operative to produce a con trol signal indicative of said change in impedance c a power amplifier circuit connected to an onboard vehicle power source and having its input connected to receive said control signal and operative to provide a power driver signal modulated according to said con trol signal d a movable vehicle window including structure opera tive for guidi
19. scillator and the output of the comparator is a pulse width modulated signal with pulse width proportional to applied 51 H02P 7 29 force The pulses are applied to power device Mosfet 52 U S Cl enn 388 829 388 840 318 280 which modulates the duty cycle 46 of the current to the 318 446 49 140 window lift mechanism drive motor to give variable motor 58 Field of Search 318 280 300 speed 318 445 489 49 31 139 140 280 388 800 841 915 11 Claims 9 Drawing Sheets 26 28 36 DRIVER S FORCE HAND 2 5 58 40 38 N I r VOLTAGE 84 DIVIDE 44 wee P 52 V 44 4 N FORCE EXPRESS FUNCTION COMPARATOR RELAY COMPARATOR OSCILLATOR 62 66 WINDOW MOTOR BI DIRECTIONAL RELAY U S Patent Jan 5 1999 Sheet 1 of 9 5 857 061 FIG Gb 5 857 061 Sheet 2 of 9 Jan 5 1999 U S Patent 2 914 YOLOW MOQGNIM 99 29 44 NO H21V1 09 9 32803 v9 AV 138 18 24 YOLVYEVIWOD NOLLONn 3 SS3UdX3 YOLVYUVdIWOD AV 134 SBM IA 111250 32803 3AVA JI9NYIYL i T YOLY UV d WOO abe v dp JOVLIOA 8v Ov YOLVNIIYV HOLIMS S 5 857 061 Sheet 3 of 9 Jan 5 1999 U S Patent FIG U S Patent Jan 5 1999 Sheet 4 of 9 5 857 061
20. t of the various devices of the circuit of FIGS and 3b is shown graphically in FIGS 5 and 5b for the different modes of operation described above The values of resistances capacitances and the integrated circuit device designations for the circuit of FIGS and 3b are given in Table I below 5 857 061 5 TABLEI FIGS 3a and 3b R Ohms C ufds U Type D Type 1 PID1 1 0 1 ULN2003 1 16 v Z 2 PID2 2 0 2 LT1013 2 24 7 3 4 4K 3 0 1111013 3 115 v Z 4 6 0K 4 04 6LT1013 4 24 7 5 10K 5 04 4 1CM7555 5 IN4148 6 5 1K 6 0 5 1CM7555 6 IN4148 7 10K 7 0 6 1 7555 7 IN4148 8 10K 8 04 191 11013 8 IN4145 9 10K 9 0 7B 6LT1013 9 IN4148 0 10K 10 01 8A 4LT1013 1 14K 11 1 8B 6LT1013 2 54 9 RFPSONOS 3 10K 10 EP2 Relay 4 10 Meg 5 10 Meg 6 51 7 10 8 36K 9 10 Meg 20 5 1K 21 10K 22 10K 23 7K 24 320K 25 320K 26 10K 27 9K 28 3K Referring to FIGS 7a and 7b an alternate embodiment of the invention indicated generally at 100 is illustrated wherein the variable impedance devices 26 28 comprise a force responsive variable capacitance Variable capacitance switches are known in the art as for example the device described in U S Pat No 5 559 665 may be employed or any other suitable variable capacitance switch may be used The variable capacitance device is of relatively thin flat configuration
21. the third step STB B remains on due to the flip flop and STB C is on A buffer amplifier U6 is connected to the junction of the capacitive divider and its output is connected to one of the analog switches of U5 This switch is activated by STB C which samples the voltage and stores the value on C 4 The output is buffered by another amplifier In the fourth step STB C is turned off and the flip flop U4 is reset which deactivates STB B The whole process is then repeated The combination of the analog switch activated by STB C C4 and the buffer amplifier is called a sample and hold circuit The output is a de voltage which is proportional to the impedance of the capacitance of the devices 26 28 to be measured The clock gates the output states and the output of U3 is low only when 01 is low As the outputs of U2 are changing clock pulses from UI hold U3 in the low or off state When STB A is high this enables pins 5 and 6 of US which goes high and shorts C3 and the capacitance of devices 26 28 to ground and discharges them When STB B is high this causes US to supply the 5 volts from pin 2 of US to C3 which is in series with the capacitance of devices 26 28 thus forming a voltage divider which has the voltage therefrom applied to U6 which is a high input impedance buffer providing a low impedance output to the comparator through terminals J3 and along line 26 U6 US and C4 form a samp
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