Method for controlling the operating sequences of a motor vehicl

Details Method for controlling the operating sequences of a motor vehicl Method for controlling the operating sequences of a motor vehicl

1994-09-01

1996-04-09

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477109, 477121, B60K 4104

Patent

active

055056717

ABSTRACT:
The invention is directed to a method for controlling the operating sequences in a motor vehicle equipped with an internal combustion engine to which amounts of fuel and air are supplied for influencing the engine torque. Furthermore, the motor vehicle includes an automatic transmission having a ratio which can be changed. The overrun operation of the motor vehicle is detected in dependence upon the position of an accelerator pedal actuated by the driver and in dependence upon a comparison of the rpm of the engine and/or the input and/or the output rpm of the transmission to at least one threshold value. The fuel quantity is at least reduced compared to normal operation when an overrun is detected. The essence of the invention is that, when overrun operation of the vehicle is detected, a downshift operation of the transmission is triggered in dependence upon the further comparison of the rpm of the engine and/or the input and/or output rpms of the transmission to at least the above-mentioned threshold value or a further threshold value. In this way, the braking torque of the engine acting at the transmission output is significantly increased within a short time. Furthermore, the downshift operation can be configured to more comfortable by a short-term increase of the engine torque.

REFERENCES:
patent: 4258591 (1981-03-01), Eckert et al.
patent: 4311123 (1982-01-01), Glockler et al.
patent: 5054450 (1991-10-01), Oota et al.
patent: 5146891 (1992-09-01), Nakazawa et al.
patent: 5186080 (1993-02-01), Simon, Jr. et al.
patent: 5249484 (1993-10-01), Matsuoka et al.
patent: 5323318 (1994-06-01), Hasegawa et al.

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