Method and system for coordinated engine and transmission contro

Details Method and system for coordinated engine and transmission contro Method and system for coordinated engine and transmission contro

1997-01-16

2000-01-04

Schwartz, Chris

Motor vehicles

With means for detecting wheel slip during vehicle...

B60K 306

Patent

active

060099674

ABSTRACT:
A coordinated engine and transmission traction control method is disclosed for reducing driven wheel speed transients related to transmission shifting during a traction control event. The method includes sensing a driven wheel speed, and estimating a driving surface coefficient of friction based on the sensed wheel speed. The method also includes prolonging a transmission upshift by reducing a rate of change of a commanded speed ratio in proportion to the estimated driving surface coefficient of friction, and decreasing engine torque during the transmission upshift. A system including a wheel speed sensor and control logic is also disclosed for performing the method.

REFERENCES:
patent: 4955449 (1990-09-01), Hilburger
patent: 5586953 (1996-12-01), Abo
patent: 5813936 (1998-09-01), Kichima
patent: 5850887 (1998-12-01), Nakashima
patent: 5921889 (1999-07-01), Nozaki

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