Driving force controller in vehicle for forcibly upshifting in r

Details Driving force controller in vehicle for forcibly upshifting in r Driving force controller in vehicle for forcibly upshifting in r

1997-03-14

1998-09-29

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Control by sensed ambient condition, pattern indicia,...

180197, B60K 2816, F02D 2902

Patent

active

058139362

ABSTRACT:
A driving-force controller in a vehicle in which, when an accelerator pedal is depressed to initially move the vehicle at a time t.sub.1, if a state in which a vehicle speed is zero due to slippage of driven wheels continues for a predetermined time, it is judged that the vehicle is on a road surface having an extremely low road surface friction coefficient. If a driven wheel speed and the vehicle speed become zero at a time t.sub.4 because a driver abandons initial acceleration and releases an accelerator pedal, a gear shift stage of an automatic transmission is forcibly shifted to a second gear shift stage, and a target slip rate set in a traction control device is switched to a decreased value. As a result, when the driver depresses the accelerator pedal to restart the vehicle at a time t.sub.5, excessive slippage is suppressed by a decrease in driven wheel torque so that the vehicle begins moving smoothly. If a driven wheel slip rate exceeds the decreased target slip rate at a time t.sub.6, engine power output is immediately decreased by the traction control to further effectively suppress excessive slippage.

REFERENCES:
patent: 5083479 (1992-01-01), Ito et al.
patent: 5269391 (1993-12-01), Ito et al.
patent: 5390116 (1995-02-01), Hayafune
patent: 5406486 (1995-04-01), Kamio et al.
patent: 5679092 (1997-10-01), Otsubo et al.

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