Electronically controlled brake system for automobiles

An electronically controlled brake system for automobiles, comprising:

• an NO(normal open)-type solenoid valve arranged at an upstream line of a wheel brake and controlling a flow of pressurized oil fed from both a master cylinder and an outlet of an oil pump to said wheel brake;
• an NC(normal close)-type solenoid valve arranged at a downstream line of said wheel brake and controlling a flow of pressurized oil discharged from said wheel brake;
• an oil suction line connecting said master cylinder to an inlet of said oil pump and feeding pressurized oil from the master cylinder to the oil pump during a TCS(traction control system) mode;
• an NC-type shuttle valve mounted on said oil suction line to open or close the oil suction line;
• and
• a low/intermediate pressure accumulator connected to both an outlet of the NC-type solenoid valve and the oil suction line so as to store the pressurized oil discharged from the wheel brake during an ABS(anti-lock brake system) pressure reducing mode, and feed the stored pressurized oil to the inlet of the oil pump during an ABS pressure increasing mode, said pressure accumulator also storing the pressurized oil outputted from the oil pump to feed the stored pressurized oil to the inlet of the oil pump during an ESP(electronic stability program) mode.