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 Method for controlling AMT system start from stop operation

Details
Inventors: Speranza, Donald;
Assignee: Eaton Corporation (Cleveland, OH)
Primary Examiner: Bonck; Rodney H.
Assistant Examiner: Lorence; Richard M.
Attorney, Agent or Firm: Rowe; D. A., Gordon; H. D.

A method for controlling an AMT system (10) is provided including sensing vehicle start from stop operation and providing closed loop control of both the clutch operator (30) and the fuel control (26) during such operation. A function (E) of the difference between actual (N) and desired (A) engine speed is calculated and compared to a reference (REF), and if greater than the reference, fuel supply to the engine (14) is not permitted to increase.

DETAILED DESCRIPTION In accordance with the present invention, the drawbacks of the prior art have been overcome or minimized by providing a control system, preferably an electronic control system, and control method, for automatic/semiautomatic mechanical transmission systems wherein clutch engagement, throttle setting, gear selection and shift decisions are made and/or executed based upon measured and/or calculated parameters including at least input signals indicative of engine speed and throttle position.
Other inputs/parameters, such as signals indicative of transmission input shaft speed, transmission output shaft speed, rate of change of throttle position, condition of the master clutch, currently engaged gear ratio, operation of the vehicle brakes, and the like are also utilized to make decisions for control of the AMT system.
The predetermined logic rules or programs by which the various input signals are processed include a method for detecting a start from stop operation, for calculating an error value (E) which is a function of engine speed and throttle position, for manipulating the clutch to minimize the value of the error value (E) and, if the magnitude of the error value (E) exceeds a predetermined reference value, preventing further increase in the supply of fuel to the engine while the magnitude of the error value (E) exceeds the reference.
Preferably, as disclosed in above-mentioned U.
S.
Pat.
No.
4,081,065, the control method will act to minimize the error value (E) where (E) is represented by the equation: E=N-A+K(dN/dt) where N=the engine speed dN/dt=the acceleration of the engine A=the throttle position K=a weighting factor E=error If the error (E) is positive, the actuator operates to engage the clutch.
If the error value (E) is negative, the actuator operates to disengage the clutch.
This control equation is operative only when the clutch is to be engaged.
To disengage the clutch, either additional control signals such as may be supplied by a switch are used; or the value of A is made small or zero by other means



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