Variable pump hydraulic system controls engine idling non-stop device

Abstract

The variable pump hydraulic system controls the engine idling non-stop device. On the basis of the existing variable pump hydraulic system controlling the engine, a pressure reducing valve group is added. The pressure reducing valve group consists of a first electromagnetic reversing valve and a pressure reducing valve. Composition, the pressure reducing valve group is connected in series between the control valve group and the pilot handle. Under the idling industrial control, as the opening of the pilot handle increases, the pressure of the two output ports of the pilot handle increases, and the increased pressure acts on the reversing valve group. , and gradually make the opening of the reversing valve group reach the maximum, but due to the limitation of the pressure reducing valve in the pressure reducing valve group, the pressure of the two output ports of the pilot handle cannot reach the maximum value, and the reversing valve group cannot be fully opened at this time. With LS or LUDV control system, the displacement of the variable pump cannot reach the maximum, so the engine does not need to provide the large torque of the variable pump at full displacement under idling industrial control, so that the engine will not stall when idling.

Description

technical field [0001] The invention belongs to the hydraulic control field of engineering machinery, in particular to a variable pump hydraulic system to control an engine idle speed avoiding flameout device. Background technique [0002] Although the load sensing (LS) control and flow distribution (LUDV) control methods of hydraulic variable pump control have developed to a relatively mature stage, no matter whether it is the LS control method or the LUDV control method, as long as the engine power is adjusted according to the hydraulic maximum power For any hydraulic system, the failure of engine idling stall will occur, because the engine cannot provide enough torque to meet the maximum input torque transmitted to the pump by the actuator at idle speed. The current solution is to add an electrical override control system to the pump. That is, when the engine is running at idle speed, the sensor detects that the engine speed drops, and the controller sends a signal to the...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a variable pump hydraulic system to control the engine idling non-flame-off device, which can solve the problem that the engine is easy to extinguish under idling operation, and has a simple structure

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