Hydrostatic Circuit Flushing Flow Cancellation

摘要

Flushing circuits for closed loop hydrostatic circuits enable overriding of the normal function of the flushing circuit during certain machine operational events where flushing can cause undesirable performance issues. The disclosed flushing circuits may prevent flow from leaving the flush valve, may prevent flow from leaving the flushing circuit, may prevent flow from entering the flushing circuit, may prevent the flush valve from shifting from a normally closed position to an open position or may replace the hydro-mechanical control of the flush valve with an electronic control. Cancellation of the flushing function may be commanded by a controller based on fluid temperatures, pressures, turning commands, engine speed, etc.

主权项

1. A hydrostatic circuit comprising:
a hydrostatic pump connected to first and second input/output lines; the first and second input/output lines connected to a hydrostatic motor to form a loop; a flush valve, a control valve and a flush outlet; the first and second input/output lines also connected to one of the flush valve or the control valve, the flush valve and control valve configured to perform three functions including providing communication between the first input/output line and the flush outlet, providing communication between the second input/output line and the flush outlet and isolating the first and second input/output lines from the flush outlet; a controller in communication with the control valve for opening the control valve and providing communication between the flush valve and the flush outlet, for closing the control valve and isolating the flush valve from the flush outlet and for reestablishing communication between one of the flush valve and the flush outlet.