US3732753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydraulic transmission control
Assignee: Motors Liquidation Co
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Filing: 1972-01-07
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Granted: 1973-05-15
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Expires: 1992-01-07
Abstract
Abstract A closed loop control for an automotive vehicle transmission includes a hydraulically driven rotary valve for selectively connecting feed and exhaust hydraulic lines to the transmission brakes and clutches thereby selecting an operational mode of the transmission according to the rotational position of the valve. An electrical transducer produces a signal corresponding to the valve position. A control circuit responsive to the position of a manually controlled range selector, a transmission output speed signal and an input torque signal generates a voltage according to the desired operational mode and compares this voltage to that from the rotary valve position sensor. A control signal is generated according to the difference in these voltages which control signal actuates a proportional solenoid valve which in turn controls the position of a spool valve. The spool valve then hydraulically operates the rotary valve to move it to a position determined by the control signal so that the new position will be consistent with the operating mode selected by the control circuit.
Inventors
- 👤 H Olsen
- 👤 I Mountain
- 👤 R Petry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:39
CPC Classifications
F; F16; F16H; F16H63/00; F16H63/02; B; B60; B60W; B60W10/00; B60W10/04; B60W10/10; B60W10/11; F16H61/00; F16H61/02; F16H61/0262; F16H61/0276
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve posiTionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a manually operated range selector switch, means for sensing the transmission output speed and a transmission input parameter and producing signals corresponding thereto, and an electrical circuit for generating the desired mode signal as a function of the selector switch position, the speed signal and the input parameter signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in signals, and hydraulic valve means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode so that the valve position signal and the desired mode signal are substantially matched.
Claim 2
Dependent Claim
177 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve posiTionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a manually operated range selector switch, means for sensing the transmission output speed and a transmission input parameter and producing signals corresponding thereto, and an electrical circuit for generating the desired mode signal as a function of the selector switch position, the speed signal and the input parameter signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in signals, and hydraulic valve means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode so that the valve position signal and the desired mode signal are substantially matched.
Claim 3
Dependent Claim
231 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve positionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal having a discrete voltage corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a range selecting circuit having a manually operated range selector switch for producing a range signal having a voltage corresponding to the selected range, each range encompassing one or more modes, means for sensing and producing signals according to the transmission input torque and output speed, and an electrical circuit for producing a desired mode signal as a function of the range signal and the relative values of the torque and speed signals such that the desired mode signal has a discrete voltage for each desired mode which is substantially equal to the voltage of the corresponding valve position signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in the signals, and means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode so that the valve position signal and the desired mode signal are substantially matched.
Claim 4
Dependent Claim
231 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve positionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal having a discrete voltage corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a range selecting circuit having a manually operated range selector switch for producing a range signal having a voltage corresponding to the selected range, each range encompassing one or more modes, means for sensing and producing signals according to the transmission input torque and output speed, and an electrical circuit for producing a desired mode signal as a function of the range signal and the relative values of the torque and speed signals such that the desired mode signal has a discrete voltage for each desired mode which is substantially equal to the voltage of the corresponding valve position signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in the signals, and means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode so that the valve position signal and the desired mode signal are substantially matched.
Claim 5
Dependent Claim
310 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve positionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a manually operated range selector switch, means for sensing the transmission output speed and a transmission input parameter and producing signals corresponding thereto, and an electrical circuit for the desired mode signal as a function of the selector switch position, the speed signal and the input parameter signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in the signals, the control signal achieving a norm when the compared signals are substantially equal, means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode including a solenoid valve responsive to the control signal for regulating hydraulic pressure according to the value of the control signal, and a spool valve having a regulating section acted upon by the regulated pressure from the solenoid valve for assuming a neutral regulating position when the control signal is at a steady state norm and for shifting the spool valve in either direction when the control signal departs from the norm, and the spool valve further having a control section for selectively connecting line pressure and exhaust to the rotary valve for rotatably driving the rotary valve when the spool valve is shifted and for locking the rotary valve in one position when the spool valve is in a neutral position, so that the rotary valve is driven to a position corresponding to the desired mode.
Claim 6
Dependent Claim
310 words
An electrohydraulic control for an automatic transmission operable in several modes comprising a closed loop control circuit including a hydraulically driven rotary valve positionable for selection of any one of several modes, an electrical sensor connected with the rotary valve for producing an electrical valve position signal corresponding to the selected mode, electrical mode selection means for producing a signal corresponding to a desired mode including a manually operated range selector switch, means for sensing the transmission output speed and a transmission input parameter and producing signals corresponding thereto, and an electrical circuit for the desired mode signal as a function of the selector switch position, the speed signal and the input parameter signal, means for comparing the desired mode signal to the valve position signal and for producing a control signal according to the difference in the signals, the control signal achieving a norm when the compared signals are substantially equal, means responsive to the control signal for effecting rotation of the rotary valve to the position corresponding to the desired mode including a solenoid valve responsive to the control signal for regulating hydraulic pressure according to the value of the control signal, and a spool valve having a regulating section acted upon by the regulated pressure from the solenoid valve for assuming a neutral regulating position when the control signal is at a steady state norm and for shifting the spool valve in either direction when the control signal departs from the norm, and the spool valve further having a control section for selectively connecting line pressure and exhaust to the rotary valve for rotatably driving the rotary valve when the spool valve is shifted and for locking the rotary valve in one position when the spool valve is in a neutral position, so that the rotary valve is driven to a position corresponding to the desired mode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |