Patent ID: 9108611
Filing Date: 2015-08-18
Classification: B60T

Abstract:
1. An electric brake system for a vehicle, the electric brake system comprising: a reservoir configured to store oil, a master cylinder provided with two hydraulic circuits and configured to generate a first hydraulic pressure using the oil stored in the reservoir, an input rod disposed to contact the master cylinder and configured to move forward according to foot force applied from a driver to a brake pedal, a pedal displacement sensor configured to sense a displacement of the brake pedal connected to the input rod, a pressure supply unit connected to the reservoir via a hydraulic channel, and configured to a hydraulic control unit comprising: a pressure supply channel connected to the pressure supply unit at one end, and connected to first and second inflow channels at the other end; the first inflow channel connecting the pressure supply unit to the first circuit via the pressure supply channel; the second inflow channel connecting the pressure supply unit to the second circuit via the pressure supply channel; a shut-off valve configured to control the first hydraulic pressure transferred from the master cylinder to a wheel cylinder installed at each wheel; switching valves connected to the first and second inflow channels and configured to control the second hydraulic pressure; compliance units installed in the first and second inflow channels and connected to the shut-off valve and the switching valves, each of the compliance units comprising: a simulator connected to the master cylinder and configured to provide reaction force according to the foot force applied to the brake pedal; and an electronic control unit configured to control a motor and the valves based on information about pressure and pedal displacement, wherein the electronic control unit is configured to operate the motor when the driver operates the brake pedal such that rotational motion of the motor is converted into rectilinear motion, wherein each of the compliance units further comprises a compliance valve arranged at an inlet of the compliance chamber, wherein the pressure supply unit comprises: wherein the hydraulic piston is connected to the screw, and the screw is configured to rectilinearly move such that the oil in the pressure chamber is pressurized by the hydraulic piston, and wherein the electronic control unit is configured to control the compliance valve of each of the compliance units while oil of the reservoir is suctioned into the pressure chamber, thereby supplying a hydraulic pressure of the compliance units to the wheel cylinder.