| 摘要 |
PURPOSE:To permit the smooth and speedy manual operation of a brake by controlling a pressure control valve by the operation quantity of a manually operated control lever installed on the periphery of a steering wheel and transmitting the necessary brake oil pressure to a master cylinder. CONSTITUTION:A three-stage selection type pressure control valve 16 is connected to a hydraulic circuit 10 which connects a reservoir tank 9 with an oil tank 9 and an accumulator 11, and a pressure sensor 17 for detecting the hydraulic pressure in the hydraulic circuit 10 is connected in series with the pressure control valve 16. The output signal of the pressure sensor 17 is input into a Pressure control circuit 19, together with the output signals supplied from a pressure switch 18, brake switch 22, manually operated switch 23 installed on the periphery of a steering wheel, manually operated control lever 25, etc. The valve 16 is controlled in correspondence with the operation quantity at that time by the manual operation of the manually operated control lever 25, and the necessary brake oil pressure can be transmitted to a master cylinder 2. |
