Fluid-pressure and analogous brake systems – Speed-controlled – Regenerative brakes
Patent
1997-01-27
1999-04-20
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Regenerative brakes
303 3, 303112, 303DIG3, 188156, 188158, 188181T, B60L 710
Patent
active
058951008
ABSTRACT:
A brake apparatus for an electric vehicle which maintains the regenerative energy generated in a traction motor of each of wheels to be at a maximum. A hydraulic pressure brake and a regenerative brake are provided in the same brake apparatus. The hydraulic pressure brake generates a brake torque by providing a hydraulic pressure to a wheel cylinder of each wheel of the vehicle. The regenerative brake generates a brake torque by regeneration in a traction motor for each wheel. The brake torque to be provided is calculated for each wheel. A maximum regenerative energy is calculated for each wheel. A hydraulic pressure calculating unit calculates a hydraulic pressure to be provided to the wheel cylinder of each wheel based on the brake torque and the maximum regenerative energy so that the regenerative energy generated by the traction motor of each wheel becomes a maximum. The hydraulic pressure calculated by the hydraulic pressure calculating unit is provided to the wheel cylinder of a corresponding wheel by a hydraulic pressure control valve which generates the hydraulic pressure by reducing a master cylinder pressure.
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Ito Masashi
Kawahata Fumiaki
Nakamura Kiyoharu
Ohkubo Masayasu
Otomo Akihiro
Butler Douglas C.
Toyota Jidosha & Kabushiki Kaisha
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