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Automatic transmission system for vehicles

  • US 4,662,494 A
  • Filed: 02/19/1985
  • Issued: 05/05/1987
  • Est. Priority Date: 02/16/1984
  • Status: Expired due to Fees
First Claim
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1. An automatic transmission system for vehicles having a friction clutch coupled to an internal combustion engine, a speed-change-gear type transmission coupled to said clutch, a first actuator for operating said clutch in response to an electric signal, a second actuator for operating said transmission in response to an electric signal, and means for producing first and second control signals for controlling the operations of said clutch by ON/OFF conditions and of said transmission by gear change positions, respectively, in response to a command signal from an operating unit, said system comprising:

  • a first detecting means for detecting the amount of depression of an accelerator pedal;

    a second detecting means for detecting the gear change position of said transmission;

    a decision means responsive to the outputs of said first and second detecting means for discriminating whether or not the amount of depression of the accelerator pedal is below a predetermined amount of depression and the gear change position of said transmission is in either the first or reverse gear position; and

    a first control means for controlling the slip rate of said clutch in accordance with the amount of depression of the accelerator pedal in order to allow very low speed vehicle operation, instead of controlling the ON/OFF condition of said clutch by said first control signal, when it is discriminated that the amount of depression of the accelerator pedal is below the predetermined amount of depression and the gear change position of said transmission is in either the first or reverse gear position.

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