Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1994-05-06
1995-12-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
180165, 188156, 188158, 303 20, 3031134, 303152, B60T 1120, B60T 1128, B60T 1366, B60T 1374
Patent
active
054763100
ABSTRACT:
A braking apparatus for an electric vehicle in which a mechanical anti-lock brake and regenerative braking cooperate with each other to improve a braking performance is realized. On condition that an accelerator is released off, the wheel rotation number is large, and a brake is trod on, a large regeneration mode is selected by a motor controller when a wheel slip is small, and a regeneration mode is selected when the wheel slip is large. When the wheel slip is small, the braking force exerted on each wheel is increased by the brake controller and the regenerative braking force is also increased so that a slip ratio comes quickly closer to 0.2. When the wheel slip is large, the brake controller reduces the braking force so that the slip ratio comes closer to 0.2. In this case, the regenerative braking force is smaller than the above case of the small wheel slip to such an extent that the operation of the brake controller is not disturbed. On condition that the accelerator is released off, the wheel rotation number is large, and the brake is released off, the regeneration mode is selected when the regeneration switch is turned on, and a coasting mode is selected when the regeneration switch is turned off.
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Kuriyama Shigeru
Naito Shotaro
Ohtsu Eiichi
Butler Douglas C.
Hitachi , Ltd.
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