Patent ID: 6499815
Filing Date: 2002-12-31
Classification: B60K,B60L,B60T

Abstract:
A wheel slip/slide correction system for a vehicle having at least one electric motor driven wheel, the system comprising:at least one sensor providing a first signal representative of actual vehicle velocity; at least one sensor providing a second signal representative of actual vehicle acceleration; at least one sensor providing a third signal representative of measured wheel velocity of the driven wheel; at least one sensor providing a fourth signal representative of measured wheel acceleration of the driven wheel; an electrical circuit for converting the first and second signals to an equivalent wheel velocity and an equivalent wheel acceleration, respectively; an electrical circuit for comparing the equivalent wheel velocity to the measured wheel velocity and for obtaining at least one velocity error signal representative of the difference therebetween; an electrical circuit for comparing the at least one velocity error signal to at least one velocity threshold value and for generating a slip/slide signal; a processor responsive to the slip/slide signal for developing an acceleration error signal representative of the difference between the equivalent wheel acceleration and the measured wheel acceleration; and a controller applying the acceleration error signal to adjust power to the driven wheel in a manner to reduce velocity error when the at least one velocity error signal exceeds the threshold value.