Fluid-pressure and analogous brake systems – Speed-controlled – Brake force or pressure determined from speed sensors
Patent
1997-02-20
1998-11-03
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Brake force or pressure determined from speed sensors
188181C, 303169, 303171, 303173, 303147, 701 74, B60T 866
Patent
active
058298479
ABSTRACT:
The present invention is directed to a vehicle motion control system for maintaining vehicle stability by controlling the braking force applied to each wheel of a vehicle. The braking force applied to each wheel is controlled on the basis of outputs of the wheel speed sensors and the vehicle speed estimation unit. A limit value is calculated to a difference between a first estimated vehicle speed calculated for a second wheel located on the right side of the vehicle and a left estimated vehicle speed calculated for a left wheel located on the left side of the vehicle. The calculation of one of the first and second estimated vehicle speeds is limited in response to the limit value, so as to keep the estimated vehicle speed calculated for one of the right and left wheels rotating at a relatively low speed to be greater than a value subtracting the limit value from the second estimated vehicle speed provided for the other one of the right and left wheels rotating at a relatively high speed. For example, the limit value is calculated on the basis of a varying value resulted from at least a change in a coefficient of friction for each wheel of the vehicle, and varied in accordance with one of a plurality of control modes.
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Fukami Masanobu
Itoh Takayuki
Tozu Kenji
Yamazaki Norio
Yasui Yoshiyuki
Aisin Seiki Kabushiki Kaisha
Butler Douglas C.
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