Fluid-pressure and analogous brake systems – Speed-controlled – Regenerative brakes
Patent
1995-05-31
1997-04-01
Poon, Peter M.
Fluid-pressure and analogous brake systems
Speed-controlled
Regenerative brakes
303 3, 188156, 180 651, B60T 1374
Patent
active
056159331
ABSTRACT:
A vehicle has an electric propulsion motor, a regenerative brake control and an anti-lock friction brake system which responds to excess wheel slip of a front wheel during braking to modulate friction braking torque to reduce the excess wheel slip. It further has a control responsive to activation of the anti-lock brake system to prevent the application of regenerative braking during such activation. The regenerative braking may be blended with the friction braking when anti-lock braking is not activated so that battery charge is conserved. When the anti-lock braking is activated, however, the regenerative braking is ramped down to preserve smoothness in the braking. The regenerative braking may be applied to create drag during vehicle coastdown. When anti-lock braking is activated, if it is sensed that the wheel is on a low friction (.mu.) surface, the regenerative braking is removed immediately. The low friction surface may be identified from the brake fluid pressure levels during the modulation process of the anti-lock brake system. The coastdown drag may be applied at more than one operator controlled level or, when cruise control is active, automatically at a higher level for more accurate vehicle speed control on downgrades.
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Conlon Brendan M.
Kidston Kevin S.
General Motors Corporation
Poon Peter M.
Sigler Robert M.
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