Hydraulic Steering Control System

摘要

A hydraulic fluid supply portion of a hydraulic steering control system may include an accumulator holding a quantity of pressurized steering fluid, and a priority valve. The priority valve may have a priority supply inlet port fluidly connected to the accumulator for receiving pressurized steering fluid from the accumulator, and a priority supply outlet port fluidly connected to a steering flow amplifier circuit. The priority valve may have a normally open position with a minimal pressure drop between the priority supply inlet port and the priority supply outlet port, and a flow restriction position where fluid flow between the ports is restricted. A load signal line from a steering control circuit to the priority valve may bias the priority valve toward the normally open position in response to an operator steering command to provide pressurized steering fluid to the steering flow amplifier circuit.

主权项

1. A hydraulic fluid supply portion of a hydraulic steering control system having a steering cylinder, a steering flow amplifier circuit in fluid communication with the steering cylinder to provide pressurized steering fluid to actuate the steering cylinder, and a steering control circuit in fluid communication with the steering flow amplifier circuit to provide pilot signals to the steering flow amplifier circuit indicative of a direction and speed with which to provide pressurized steering fluid to actuate the steering cylinder, the hydraulic fluid supply portion comprising:
an accumulator holding a quantity of pressurized steering fluid and having an accumulator supply conduit; and a priority valve having a priority supply inlet port fluidly connected to the accumulator supply conduit for receiving pressurized steering fluid from the accumulator, a priority supply outlet port fluidly connected to an amplifier circuit supply inlet port of the steering flow amplifier circuit, wherein the priority valve has a normally open position where pressurized fluid is directed from the priority supply inlet port to the priority supply outlet port with a minimal pressure drop and a flow restriction position where pressurized fluid flow from the priority supply inlet port to the priority supply outlet port is restricted by a maximum restriction amount, wherein a load signal line fluidly connects the steering control circuit to the priority valve to provide a load signal indicative of an amount of pressurized steering fluid to be provided to the steering flow amplifier circuit in response to an operator steering command, and wherein the load signal biases the priority valve toward the normally open position.