Device for controlling brake system of vehicle with care for battery
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasayuki Soga
Life of this patent
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Abstract
A device for controlling an electro-hydraulic brake system of a vehicle checks if the battery or the alternator forming an electric power source for the electric part of the brake system is in its normal operating condition, and when the battery or the alternator is not in its normal operating condition, lowers the load imposed on the battery, so as to care the battery against a too soon failure. The device may also check if the driver is pumping the brake pedal at a substantial standstill of the vehicle, and when the brake pedal is so pumped, also lowers the load imposed on the battery, so as to care the battery against a useless consumption of the battery.
Claims8
A device for controlling an electro-hydraulic brake system of a vehicle having wheels, a battery, an alternator for charging the battery, and the electro-hydraulic brake system adapted to be energized by the battery and including wheel cylinders, a brake pedal, electric control means, a pump adapted to operate under a control of the electric control means for pressurizing a brake fluid, and on-off valves adapted to operate under a control of the electric control means for selectively supplying the brake fluid pressurized by the pump to each of the wheel cylinders, the device comprising:
- means for detecting if the battery is normally operating;
- wherein the electric control means control the operation of the pump and the on-off valves such that the pressure of the brake fluid supplied to the wheel cylinders is restricted not to be higher than a first predetermined medium pressure value when the battery detection means detect that the battery is not normally operating.
Dependencies are inferred from the claim text.