US3752011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for controlling a power transmission
Assignee: Motors Liquidation Co
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Filing: 1971-10-18
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Granted: 1973-08-14
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Expires: 1991-10-18
Abstract
Abstract In a transmission having a torque converter and a gear set wherein a ratio shift is accomplished by disengaging a brake or clutch and engaging another, a smooth shift is effected by controlling the clutch or brake pressures as a function of continuously computed values of turbine torque, turbine acceleration, and instantaneous gear ratio. These three parameters are computed by electronic analog circuitry from measured values of engine speed, turbine speed and transmission output speed. A logic circuit responsive to shift command, turbine speed and output speed conditions the analog circuit for operation. The analog output signal is converted to pressure by a solenoid valve.
Inventors
- 👤 G Casey
- 👤 J Cogswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/06; F16H61/061; F16H59/00; F16H59/36; F16H59/38; F16H2059/385; F16H59/46; F16H2059/465; F16H2059/467; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19149; Y10T74/19153
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
141 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change and an output member comprising continuously determining the input torque of one of the fluid drive members, the acceleration of the driven member and the instantaneous gear ratio, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 2
Independent Claim
141 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change and an output member comprising continuously determining the input torque of one of the fluid drive members, the acceleration of the driven member and the instantaneous gear ratio, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 3
Independent Claim
159 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change and an output member comprising sensing the speeds of the input member, the driven member and the output member, continuously determining from the sensed speeds the input torque of the driven member, the acceleration of the driven member and the instantaneous gear ratio, applying a shift signal to request a change to a desirEd ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, the driven member input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 4
Independent Claim
159 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change and an output member comprising sensing the speeds of the input member, the driven member and the output member, continuously determining from the sensed speeds the input torque of the driven member, the acceleration of the driven member and the instantaneous gear ratio, applying a shift signal to request a change to a desirEd ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, the driven member input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 5
Independent Claim
141 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a turbine, and a multiratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantnaeous gear ratio, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the pressure on the ratio selecting means during the ratio changer as a function of the ratio comparison, the turbine input torque and the turbine acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 6
Independent Claim
141 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a turbine, and a multiratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantnaeous gear ratio, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the pressure on the ratio selecting means during the ratio changer as a function of the ratio comparison, the turbine input torque and the turbine acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 7
Independent Claim
149 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a turbine, and a multi-ratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying a shift signal to signal a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the pressure on the ratio selecting means during the ratio change according to the integral of the quantity comprising the turbine acceleration plus the turbine input torque times a function of the ratio comparison to smoothly bring the instanteous gear ratio to a value substantially consistent with the desired ratio.
Claim 8
Independent Claim
149 words
A method of controlling a ratio change in a transmission having a fluid drive means including an input member and a turbine, and a multi-ratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying a shift signal to signal a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, and variably controlling the pressure on the ratio selecting means during the ratio change according to the integral of the quantity comprising the turbine acceleration plus the turbine input torque times a function of the ratio comparison to smoothly bring the instanteous gear ratio to a value substantially consistent with the desired ratio.
Claim 9
Independent Claim
168 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multiratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining the turbine input torque as a function of the speed of the input member and the turbine, continuously determining the turbine acceleration as a function of turbine speed, continuously determining the instantaneous gear ratio as the ratio of turbine speed to output member speed, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and variably controlling the pressure on the ratio selecting means during the ratio change as a function of the ratio comparison, the turbine input torque and the turbine acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 10
Independent Claim
168 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multiratio gear train including pressure responsive ratio selecting means and an output member comprising sensing the speeds of the input member, the output member and the turbine, continuously determining the turbine input torque as a function of the speed of the input member and the turbine, continuously determining the turbine acceleration as a function of turbine speed, continuously determining the instantaneous gear ratio as the ratio of turbine speed to output member speed, applying a shift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and variably controlling the pressure on the ratio selecting means during the ratio change as a function of the ratio comparison, the turbine input torque and the turbine acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 11
Independent Claim
233 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multi-ratio gear train including an output member, and a pair of selectively engageable, pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, comprising the steps of sensing the speeds of the input member, the output member and the turbine, continuously determining from tHe sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying an upshift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, variably controlling the pressure on the engaging device during the ratio change as a function of the ratio comparison, the turbine input torque and the turbine acceleration to thereby gradually increase the torque capacity of the engaging device to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio, rapidly disengaging the other device in response to turbine deceleration which occurs as a result of the increased torque capacity of the engaging device, and increasing the pressure on the engaging device to effect complete engagement thereof when the instantaneous gear ratio reaches a prescribed value which is close to the desired ratio.
Claim 12
Independent Claim
233 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multi-ratio gear train including an output member, and a pair of selectively engageable, pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, comprising the steps of sensing the speeds of the input member, the output member and the turbine, continuously determining from tHe sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying an upshift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, variably controlling the pressure on the engaging device during the ratio change as a function of the ratio comparison, the turbine input torque and the turbine acceleration to thereby gradually increase the torque capacity of the engaging device to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio, rapidly disengaging the other device in response to turbine deceleration which occurs as a result of the increased torque capacity of the engaging device, and increasing the pressure on the engaging device to effect complete engagement thereof when the instantaneous gear ratio reaches a prescribed value which is close to the desired ratio.
Claim 13
Independent Claim
223 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multi-ratio gear train including an output member and a pair of selectively engageable, pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, comprising the steps of sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying a downshift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, variably controlling the pressures on the devices during the ratio change as a function of the ratio comparison, the turbine input torque, the turbine acceleration and the speed of the output member for thereby gradually decreasing the torque capacity of the disengaging device and then increasing the torque capacity of the engaging device to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio, increasing the pressure on the engaging device to effect complete engagement thereof when the instantaneous gear ratio reaches a prescribed value which is close to the desired ratio.
Claim 14
Independent Claim
223 words
A method of controlling a ratio change in a transmission having a torque converter including an input member and a turbine, and a multi-ratio gear train including an output member and a pair of selectively engageable, pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, comprising the steps of sensing the speeds of the input member, the output member and the turbine, continuously determining from the sensed speeds the turbine input torque, the turbine acceleration and the instantaneous gear ratio, applying a downshift signal to request a change to a desired ratio, continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison, variably controlling the pressures on the devices during the ratio change as a function of the ratio comparison, the turbine input torque, the turbine acceleration and the speed of the output member for thereby gradually decreasing the torque capacity of the disengaging device and then increasing the torque capacity of the engaging device to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio, increasing the pressure on the engaging device to effect complete engagement thereof when the instantaneous gear ratio reaches a prescribed value which is close to the desired ratio.
Claim 15
Dependent Claim
170 words
A control for effecing a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change, and an output member comprising sensing means for sensing the speeds of the input member, the driven member and the output member, means for continuously determining from the sensed speed the input torque of the driven member, the acceleration of the driven member and the instantaneous gear ratio, means for applying a shift signal to request a change to a desired ratio, means for continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and means for variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, the driven member input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 16
Dependent Claim
170 words
A control for effecing a ratio change in a transmission having a fluid drive means including an input member and a driven member, and a multiratio gear train including engageable variable torque capacity torque transmitting means for effecting a ratio change, and an output member comprising sensing means for sensing the speeds of the input member, the driven member and the output member, means for continuously determining from the sensed speed the input torque of the driven member, the acceleration of the driven member and the instantaneous gear ratio, means for applying a shift signal to request a change to a desired ratio, means for continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and means for variably controlling the torque capacity of the torque transmitting means during the ratio change as a function of the ratio comparison, the driven member input torque and the driven member acceleration to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 17
Dependent Claim
260 words
A control for effecting a ratio change in a transmission having a torque converter including an input member and a turbine, and a multiratio gear train including an output member and a pair of selectively engageable pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, and pressure regulating means responsive to a control signal for controlling the pressure on the devices, comprising means for sensing the speeds of the input member, the output member and the turbine and providing electrical signals representing the speeds, a circuit responsive to the input member and turbine speed signals for continuously determining the turbine input torque, a circuit responsive to the turbine speed signal for continuously determining the turbine acceleration, a circuit responsive to the turbine speed signal and the output member speed signal for continuously determining the instantaneous gear ratio as the ratio of the turbine speed to the output member speed, means for applying a shift signal to request a change to a desired ratio, a circuit for continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and a circuit for providing the control signal and therefore variably controlling the pressure on the devices during the ratio change according to the integral of the quantity comprising the turbine acceleration plus the turbine input torque times a function of the ratio comparison to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
Claim 18
Dependent Claim
260 words
A control for effecting a ratio change in a transmission having a torque converter including an input member and a turbine, and a multiratio gear train including an output member and a pair of selectively engageable pressure responsive torque transmitting devices having variable torque capacities wherein a ratio change is effected by engaging one of the devices and disengaging the other of the devices, and pressure regulating means responsive to a control signal for controlling the pressure on the devices, comprising means for sensing the speeds of the input member, the output member and the turbine and providing electrical signals representing the speeds, a circuit responsive to the input member and turbine speed signals for continuously determining the turbine input torque, a circuit responsive to the turbine speed signal for continuously determining the turbine acceleration, a circuit responsive to the turbine speed signal and the output member speed signal for continuously determining the instantaneous gear ratio as the ratio of the turbine speed to the output member speed, means for applying a shift signal to request a change to a desired ratio, a circuit for continuously comparing the instantaneous gear ratio with the desired ratio to determine the ratio comparison and a circuit for providing the control signal and therefore variably controlling the pressure on the devices during the ratio change according to the integral of the quantity comprising the turbine acceleration plus the turbine input torque times a function of the ratio comparison to smoothly bring the instantaneous gear ratio to a value substantially consistent with the desired ratio.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |