Patent ID: 9643581
Date: 2017-05-09
CPC Classifications: B60T

Claim:
1. An electric brake system comprising: a reservoir configured to store oil; a master cylinder having first and second hydraulic ports, connected to the reservoir to receive oil from the reservoir; a simulation device connected not only to a pedal displacement sensor sensing a displacement of a brake pedal, but also to the master cylinder, configured to provide reaction force in response to foot force applied to the brake pedal; a hydraulic-pressure supply device configured to convert rotational force of a motor into rectilinear motion upon receiving an electric signal from the pedal displacement sensor according to operation of the brake pedal, and move a double-acting piston designed to perform reciprocating motion within a hydraulic cylinder, wherein the double-acting piston moves in one direction to generate hydraulic pressure by pressing a first hydraulic chamber provided in one end thereof, and moves in another direction to generate hydraulic pressure by pressing a second hydraulic chamber provided in the other end thereof; a hydraulic-pressure control unit including a first hydraulic circuit connected to the first hydraulic chamber via a first hydraulic passage, and a second hydraulic circuit connected to the second hydraulic chamber via a second hydraulic passage, configured to control flow of hydraulic pressure applied to a caliper brake installed in each wheel via a plurality of valves disposed in the first and second hydraulic circuits; a first backup passage configured to connect the first hydraulic port to the first hydraulic chamber; a second backup passage configured to connect the second hydraulic port to the second hydraulic chamber; a first cut valve disposed in the first backup passage, configured to control flow of hydraulic pressure; a second cut valve disposed in the second backup passage, configured to control flow of hydraulic pressure; and an electronic control unit (ECU) configured to control the motor and one or more valves on the basis of hydraulic pressure information and pedal displacement information.