Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1997-07-30
1999-09-14
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303152, B60T 1374
Patent
active
059511150
ABSTRACT:
The present invention is directed to a brake control system for an electrically operated vehicle which is adapted to add a hydraulic braking operation to a regenerative braking operation, or change the former for the latter, rapidly and smoothly. An electric motor is operatively connected to a wheel for rotating the wheel, and a motor control unit for controlling the electric motor to apply a rotating force and a regenerative braking force to the wheel. In a main passage for connecting a master cylinder with a wheel brake cylinder, a pressure limit changeover device is disposed. The changeover device includes a first pressure limit device which is adapted to close the main passage when a master cylinder pressure is lower than a first predetermined pressure, and open the main passage when the master cylinder pressure exceeds the first predetermined pressure, and a second pressure limit device which is adapted to close the main passage when the master cylinder pressure is lower than a second predetermined pressure which is lower than the first predetermined pressure, and open the main passage when the master cylinder pressure exceeds the second predetermined pressure. First and second valve devices for opening or closing the main passage are connected to the main passage in parallel with the first pressure limit device, and the second valve device is connected in series of the second pressure limit device.
REFERENCES:
patent: 5253929 (1993-10-01), Ohori
patent: 5568962 (1996-10-01), Enomoto et al.
patent: 5882093 (1999-03-01), Enomoto et al.
Ando Masamoto
Enomoto Naoyasu
Ohori Harumi
Sakai Toshiyuki
Urababa Shingo
Aisin Seiki Kabushiki Kaisha
Oberleitner Robert J.
Talavera Melanie
Toyota Jidosha & Kabushiki Kaisha
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