| 摘要 |
<p>A master cylinder (21) generates master cylinder pressures in response to a brake operation by a driver on a brake pedal (10). A power hydraulic pressure generation device (30) includes a pressure pump (31) and an accumulator (32), and the accumulator (32) accumulates an accumulator pressure increased by the pressure pump (31). A hydraulic pressure control valve device (50) includes holding valves (61), pressure decreasing valves (62), and master cut valves (63) to (64) for carrying out transmission of the master cylinder pressures from the master cylinder (21) or the accumulator pressure from the accumulator (32). A stroke simulator (70) is connected to a master pressure pipe (12) via a simulator cut valve (72). The normally-open master cut valves (63) and (64) and the normally-closed simulator cut valve (72) for carrying out transmission of the master cylinder pressures mechanically generated by the master cylinder (21) are backed up with backup electric power so that the operations continue even in the event of a change in state of electric power supply.</p> |
