Shift control system for engine mounted automobile automatic transmissions专利检索-电液伺服作动器致动器机电学专利检索查询-专利查询网

Shift control system for engine mounted automobile automatic transmissions

阅读：111发布：2024-01-15

专利汇可以提供Shift control system for engine mounted automobile automatic transmissions专利检索，专利查询，专利分析的服务。并且A shift control system for engine mounted automobile automatic transmissions comprising a low speed forward drive ratio one-way clutch provided to obtain the required gear shifting engagement of a gear train, friction engagement means with hydraulic servo units for providing intermediate speed and high speed forward ratios, and electro-hydraulic control means for generating electrical signals corresponding to the driving conditions of the automobile to control the operations of the one-way clutch and the friction engagement means, whereby when the automobile is driven with the engine output torque lower than a predetermined value, a shift is effected directly from the high speed forward drive ratio to the low speed forward drive ratio to permit the automobile to coast at the low speed forward drive ratio under the overrunning condition.，下面是Shift control system for engine mounted automobile automatic transmissions专利的具体信息内容。

权利要求

1. A shift control system for engine mounted automobile automatic transmissions comprising a one-way clutch for establishing a low speed forward drive ratio in the transmission, friction engagement means with hydraulic servos for establishing an intermediate speed forward drive ratio and a high speed forward drive ratio, a hydraulic pressure source for supplying hydraulic pressures to said friction engagement elements, shift valves for distributing the hydraulic pressures to said friction engagement elements to establish a selected one of said drive ratios, engine torque responsive electrical signal generating means, means for generating a parameter electrical signal which varies as a function of an engine parameter relating to a driving condition of the automobile shift point computing circuits for receiving said parameter signal generating electrical signals to operate said shift vaLves to establish said selected drive ratio according to said parameter signal, and a shift point modification circuit for modifying the shift point computed by said shift point computing circuits according to said electrical signals generated when the engine torque is lower than a predetermined value, whereby when the automobile is driven with the engine torque lower than said predetermined value, a shift is effected directly from the high speed forward drive ratio to the low speed forward drive ratio to thereby permit the automobile to coast at the low speed forward drive ratio under the overrunning condition.

2. A shift control system for engine mounted automobile automatic transmissions according to claim 1, wherein said shift valves comprise a first shift valve to distribute a hydraulic pressure to the hydraulic servo for establishing said intermediate speed forward drive ratio, and a second shift valve to distribute a hydraulic pressure to the hydraulic servo for establishing said high speed forward drive ratio.

3. A shift control system for engine mounted automobile automatic transmissions according to claim 1, wherein said parameter generating means including means for generating vehicle speed responsive electrical signals.

4. A shift control system for engine mounted automobile automatic transmissions according to claim 2, wherein said parameter generating means including means for generating vehicle speed responsive electrical signals.

5. A shift control system for engine mounted automobile automatic transmissions according to claim 4, wherein when the vehicle decelerates while being driven at the high speed forward drive ratio with the engine torque lower than said predetermined value, said shift point modification circuit comes into operation to cause said first shift valve to exhaust the hydraulic pressure supply to the hydraulic servo for establishing the intermediate speed forward drive ratio prior to or at the instant said second shift valve exhausts the hydraulic pressure supply to the hydraulic servo for establishing the high speed forward drive ratio, whereby the vehicle speed is directly reduced from the high speed forward drive ratio to the low speed forward drive ratio to permit the automobile to coast at the low speed forward drive ratio under the overrunning condition.

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Shift control system for engine mounted automobile automatic transmissions

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