| 摘要 |
A hydraulic controller for providing regulated transfer of pressurized fluid between a tank (T), an accumulator (A) serviced by a source of pressurized fluid (PS), and the brakes (B) of a vehicle including a housing (36,37; 236,237), an actuator plunger (45; 245) extending into the housing, a regulator spring (57; 257) operatively connected to the actuator plunger, and actuator (11; 247) for selectively moving the actuator plunger to controllably compress the regulator spring, and a regulating spool (65; 265) variably positioned by the regulator spring and the pressurized fluid to relieve pressurized fluid in the brakes to the tank and to provide pressurized fluid from the accumulator to the brakes at a pressure proportional to the compression of the regulator spring. The regulator spring may be a plurality of staged springs (161,165) to provide different spring rates and an override (330) may be provided on the actuator plunger for selectively compressing the regulator spring in response to a pressurized fluid input.
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