Electronic control brake system for vehicles
View Patent ↗Disclosed is an electronic control brake system for vehicles which suppresses residual frictional force generated due to contact between pads and a disc. The electronic control brake system for vehicles includes a master cylinder, wheel brakes, each of which includes a caliper device including a disc and advancing and retracting a pair of pads pressing the disc to exhibit braking force by brake hydraulic pressure transmitted from the master cylinder, plural NO and NC type solenoid valves, low pressure accumulators, pumps and a motor pressurizing a fluid stored in the low pressure accumulators to discharge the fluid to the wheel brakes or the master cylinder, and a section between the plural solenoid valves and the low pressure accumulator is are formed as a closed circuit section, and the pump is driven to move a part of the fluid in the closed circuit section to the outlet of the pump.
1. An electronic control brake system for vehicles comprising a master cylinder forming brake hydraulic pressure according to operation of a brake pedal, wheel brakes, each of which includes a caliper device including a disc provided in a vehicle and advancing and retracting a pair of pads pressing the disc so as to exhibit braking force by the brake hydraulic pressure transmitted from the master cylinder, plural NO solenoid valves and NC solenoid valves respectively provided at upstream sides and downstream sides of the wheel brakes and controlling the flow of the brake hydraulic pressure, low pressure accumulator in which a fluid discharged from the wheel brakes is temporarily stored during pressure reduction braking of the NO and NC solenoid valves, a pump, a motor pressurizing the fluid stored in the low pressure accumulator so as to discharge the fluid to the wheel brakes or the master cylinder, a NC shuttle valve and a TC solenoid valve for traction control, and an electronic control opening and closing valve between the low pressure accumulator and the pump,
wherein a section between the plural NO and NC solenoid valves and the low pressure accumulator is formed as a closed circuit section to retract the pads from the disc, and the pump is driven to move a part of the fluid in the closed circuit section to an outlet of the pump, and
wherein a section between the electronic control opening and closing valve and the NC shuttle valve is formed as a closed circuit section, and after the pump is driven to move a part of the fluid in the closed circuit section between the electronic control opening and closing valve and the NC shuttle valve to the outlet of the pump, the electronic control opening and closing valve is opened to move a part of the fluid in the closed circuit section between the plural NO and NC solenoid valves and the low pressure accumulator.
2. The electronic control brake system for vehicles according to claim 1 , wherein the closed circuit section is formed by closing the NO solenoid valves and opening the NC solenoid valves.
3. The electronic control brake system for vehicles according to claim 1 , wherein the fluid in the closed circuit section between the electronic control opening and closing valve and the NC shuttle valve is moved to a section between the pump and the TC solenoid valve.
4. The electronic control brake system for vehicles according to claim 1 , wherein the fluid in the closed circuit section between the electronic control opening and closing valve and the NC shuttle valve is returned to the master cylinder.