Control for a motor vehicle drive having an automatic transmissi

Details Control for a motor vehicle drive having an automatic transmissi Control for a motor vehicle drive having an automatic transmissi

1992-08-28

1994-08-09

Braun, Leslie A.

Interrelated power delivery controls, including engine control

Transmission control

Engine controlled by transmission

3644241, B60K 4106

Patent

active

053355687

ABSTRACT:
A motor vehicle drive has an engine and an automatic transmission. A control for the motor vehicle drive includes an engine control for controlling a variable influencing torque of the engine and a transmission control for controlling shifting events of the transmission and for transmitting an intervention signal initiating a shifting event to the engine control. The transmission control includes a first device for ascertaining a current transmission input torque, a memory for storing torque values being maximally allowable during a shifting event, as a function of engine rpm and shifting type, a second device for comparing the current transmission input torque with the maximum allowable torque value at any given time and ascertaining a proportion by which the engine torque is to be varied during the shifting event, and a pulse former circuit for converting the proportion into a pulse modulated signal to be transmitted to the engine control as a control signal for controlling a variation in the engine torque during the shifting event.

REFERENCES:
patent: 4228700 (1980-10-01), Espenschied et al.
patent: 4403527 (1983-09-01), Mohl et al.
patent: 4594666 (1986-06-01), Cornell
patent: 4648040 (1987-03-01), Cornell et al.
patent: 4663714 (1987-05-01), Cornell et al.
patent: 4945481 (1990-07-01), Iwatsuki et al.
patent: 4968999 (1990-11-01), Fodale et al.
patent: 5029087 (1991-07-01), Cowan et al.

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