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US3792631A Expired / Lapsed US ⏱️ 0.0 years remaining

Speed ratio comparator unit for control system of automotive automatic transmission

Assignee: Nissan Motor Co Ltd
•
Filing: 1972-01-10
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Granted: 1974-02-19
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Expires: 1992-01-10
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Abstract

Abstract An electronic control device used in an automatic transmission of an automotive vehicle having a plurality of forward gear ratios, for generating a plurality of corresponding synchronized signals when the automatic transmission is in a synchronized condition between the engine speed and the vehicle speed multiplied by one of the gear ratios at which ratio shifting of the transmission is to be effected. In the control device, the engine speed is detected at an output shaft of the engine, while the vehicle speed is detected at a driven shaft of the engine and is multiplied by the particular gear ratio selected to be shifted thereto. These two signals are then converted into respective d.c. voltages and subsequently compared with each other by a set of voltage dividers. These voltage dividers render in turn a set of corresponding transistors when the divided voltage assumes a predetermined level dictating that the automatic transmission is in the synchronized condition. With at least one of the transistors rendered conductive, a set of corresponding relays are actuated to switch-over its contacts to generate one of the synchronized signals at a correspondingly different output terminal through a governor switch. When the automatic transmission is in an a synchronized condition, on the other hand, the control device generates at its another terminal through the governor switch a throttle control signal indicating that the throttle valve should be opened or closed to make the engine speed change to be synchronized speed in the particular running condition.

Inventors

  • 👤 Y Mori

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 10:25
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/0403; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 319 words
In an electronic control device for synchronized gear shifting in a variable speed transmission for a vehicle driven by an engine, in which means are provided for generating a first d.c. voltage proportional to the speed of rotation of an output shaft of the transmission and second d.c. voltage proportional to the speed of rotation of an output shaft of the engine, respectively, the combination comprising, a d.c. energy source, a first switch providing a first asynchronous signal when open, a second switch connected in series with said first switch, said second switch providing a synchronous signal for a particular gear ratio of the transmission when open with said first switch being closed, said second switch providing a second asynchronous signal when closed with said first switch being closed, said first asynchronous signal indicating that the engine speed is below a synchronous speed for the particular gear ratio, said second asynchronous signal indicating that the engine speed is above the synchronous speed, a governor switch electrically connecting said d.c. energy source with said first switch when closed, a voltage divider system electrically connected to said d.c. voltage generating means and including at least a first resistor, a second resistor and a third resistor interconnected in series, said resistors having predetermined resistance ratios, a first transistor having its emitter grounded and its base electrically connected between said first and second resistors of said voltage divider, a second transistor having its emitter grounded and its base electrically connected between said second and third resistors of said voltage divider, a first solenoid coil electrically connected at one end to said d.c. energy source and at the other end to the collector of said first transistor for actuating said first switch, and a second solenoid coil electrically connected at one end to said d.c. energy source and at the other end to the collector of said second transistor for actuating said second switch.
Claim 2
Dependent Claim 319 words
In an electronic control device for synchronized gear shifting in a variable speed transmission for a vehicle driven by an engine, in which means are provided for generating a first d.c. voltage proportional to the speed of rotation of an output shaft of the transmission and second d.c. voltage proportional to the speed of rotation of an output shaft of the engine, respectively, the combination comprising, a d.c. energy source, a first switch providing a first asynchronous signal when open, a second switch connected in series with said first switch, said second switch providing a synchronous signal for a particular gear ratio of the transmission when open with said first switch being closed, said second switch providing a second asynchronous signal when closed with said first switch being closed, said first asynchronous signal indicating that the engine speed is below a synchronous speed for the particular gear ratio, said second asynchronous signal indicating that the engine speed is above the synchronous speed, a governor switch electrically connecting said d.c. energy source with said first switch when closed, a voltage divider system electrically connected to said d.c. voltage generating means and including at least a first resistor, a second resistor and a third resistor interconnected in series, said resistors having predetermined resistance ratios, a first transistor having its emitter grounded and its base electrically connected between said first and second resistors of said voltage divider, a second transistor having its emitter grounded and its base electrically connected between said second and third resistors of said voltage divider, a first solenoid coil electrically connected at one end to said d.c. energy source and at the other end to the collector of said first transistor for actuating said first switch, and a second solenoid coil electrically connected at one end to said d.c. energy source and at the other end to the collector of said second transistor for actuating said second switch.

References Cited (Backward Citations)

US3068715A Cited
US2952346A Cited
US3335830A Cited
US3417640A Cited
US3446097A Cited
US3439564A Cited
US3545307A Cited
US3478851A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-02-18 1977-08-20 1978-02-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-02-18 1981-08-20 1982-02-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-02-18 1985-08-20 1986-02-19 $7700.00 Window Closed / Lapsed

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