MACHINE CONTROL SYSTEM HAVING HYDRAULIC WARMUP PROCEDURE

摘要

A control system for a machine is disclosed. The control system may have a bypass passage situated to allow fluid to bypass an actuator, and a warmup valve disposed within the bypass passage that is movable between flow-passing and-blocking positions. A controller is configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, compare the pressure of the fluid of the actuator with a threshold, and move the warmup valve to the flow-blocking position and reduce a pump outlet pressure when the pressure of the fluid is greater than the threshold. The controller may be configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, and adjust an input speed of the pump in response to the signal.

主权项

1. A machine control system, comprising:
a pump driven to pressurize fluid; a low pressure reservoir; at least one actuator connected to receive fluid pressurized by the pump and discharge fluid to the low pressure reservoir; a bypass passage situated to allow fluid pressurized by the pump to bypass the at least one actuator and flow to the low pressure reservoir; a warmup valve disposed within the bypass passage and being movable between a flow-passing position and a flow-blocking position; a hydraulic temperature sensor configured to generate a signal indicative of a temperature of the fluid; a pressure sensor associated with the at least one actuator and configured to generate a signal indicative of a pressure of the fluid; and a controller in communication with the pump, the warmup valve, the hydraulic temperature sensor, and the pressure sensor, the controller being configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, and compare the pressure of the fluid of the at least one actuator with a pressure threshold, and move the warmup valve to a flow-blocking position and reduce a pump outlet pressure when the pressure of the fluid is greater than the pressure threshold.