Patent ID: 9120467
Filing Date: 2015-09-01
Classification: B60T

Abstract:
1. An electro-hydraulic brake comprising: a master cylinder having two hydraulic circuits and generating hydraulic pressure; a housing including a booster chamber contacting the master cylinder to compress the master cylinder, and a base chamber including a piston moving by foot effort of a driver and generating pressure based on displacement of the piston due to the foot effort; an oil reservoir connected to the upper portion of the master cylinder to store oil; a hydraulic control unit connected to the oil reservoir to generate hydraulic pressure; a simulation unit to provide reaction force of the pedal; and a pedal displacement sensor to sense displacement of the pedal, wherein the hydraulic control unit includes an accumulator to store a designated level of pressure to supply the pressure to the booster chamber, a pump to absorb the oil from the oil reservoir and to discharge the oil to the accumulator to form pressure in the accumulator, a motor to drive the pump, a normal cut valve to control connection between the base chamber and the booster chamber, a simulation control valve to control connection between the base chamber and the simulation unit, two control valves to control the pressure in the booster chamber, pressure sensors to sense the pressures in the base chamber, the accumulator and the booster chamber, and a controller to control the motor and the valves based on pressure information and pedal displacement information, and wherein the pressure sensors include a first pressure sensor to measure the pressure in the base chamber, a second pressure sensor to measure the pressure in the accumulator, and a third pressure sensor to measure the pressure in the booster chamber.