| 摘要 |
PROBLEM TO BE SOLVED: To ensure braking pressure using an accumulator of small capacity in the case of braking by supplying a braking pressure cylinder with braking pressure generated by a braking pressure generating means. SOLUTION: A hydraulic pump 9 driven by an electric motor 8 is interposed between low pressure side and high pressure side pipelines 7L, 7H. An accumulator 11 is connected to the discharge side of the hydraulic pump 9 through a first solenoid selector valve 10, and pressure control valves 13FL-13RR are connected to the low pressure side and high pressure side pipelines 7L, 7G to constitute a braking pressure generating circuit 6. The front wheel side output pressure of the braking pressure generating circuit 6 and the output pressure of a master cylinder 1 are selected by solenoid directional control valves 3FL, 3FR and supplied to wheel cylinders 5FL, 5FR, and a stroke simulator 16 is connected through a prarllel circuit of a solenoid selector valve 15 and a check valve 17 so as to absorb the output pressure of the master cylinder 1. The electric motor 8 and the first solenoid selector valve 10 are controlled on the basis of the target braking pressure, the accumulated pressure of the accumulator and actual braking pressure. |
