| 摘要 |
PURPOSE: A hydraulic pressure control device of brake fluid is provided to improve the initial pressure increase rate of a wheel cylinder during traction control or dynamic control of the vehicle by forming an auxiliary accumulator in the passage of a hydraulic pump and the wheel cylinder. CONSTITUTION: A hydraulic pressure control device is composed of a master cylinder(53); wheel cylinders(70a-70d) braking by receiving brake fluid; normal open solenoid inlet valves(55a-55d) and normal close solenoid outlet valves(56a-56d) formed in inlets and outlets of wheel cylinders to regulate flow of braking pressure; hydraulic pumps(58a,58b) sucking and discharging brake fluid to wheel cylinders; middle pressure accumulators(66a,66b) formed in the bypass passage to accumulate pressure of brake fluid; and an electronic control unit regulating hydraulic pressure of brake fluid transmitted to the wheel cylinders. Auxiliary accumulators(78a,78b) are placed between hydraulic pumps and wheel cylinders to accumulate pressure of brake fluid through the normal close outlet valve. The electronic control unit controls brake traction and position of the vehicle by supplying hydraulic pressure to the wheel cylinders with driving the hydraulic pumps and opening the normal close outlet valves.
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