Power control method and power control system for lifting equipment

Abstract

The invention discloses a power control method for hoisting equipment. The method comprises the steps of: 1) detecting the current loading pressure of the hoisting equipment's power system, converting the current loading pressure into an electrical signal, and directly conveying the signal to ECU of an engine through a circuit; and 2) according to the electrical signal, outputting an engine speed matching with the current loading pressure. According to the method, the current loading pressure is transferred the engine ECU in the form of the electric signal, the mode and time for transferring an external load signal to the engine are changed, the time required for signal transmission is reduced, and the engine can rapidly response in advance. Thus, flameout caused by too much sudden fall of the engine speed can be avoided when the pressure load suddenly increases, thus effectively improving the power adaptability of engine under a low speed condition. The invention also discloses a power control system for hoisting equipment.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a power control method and a power control system for lifting equipment. Background technique [0002] The power system of lifting equipment usually includes a power unit and a hydraulic system, wherein the power unit includes an engine, a gearbox and a power take-off, and the hydraulic system includes a hydraulic pump, a hydraulic valve and a hydraulic motor. [0003] During the working process, the engine in the power unit provides the original power, the power take-off and the gearbox transmit the power of the engine to the hydraulic pump, and the hydraulic pump provides hydraulic power. When the operator operates the hydraulic handle to issue a hoisting command, the opening signal of the handle is first transmitted to the hydraulic valve, and the hydraulic valve distributes the hydraulic oil flow provided by the hydraulic pump according to the opening signal, so...

AI Technical Summary

Problems solved by technology

[0010] However, since the engine speed has dropped at this time, the actual intake air volume of the engine has also decreased. Although the ECU controls the fuel injection volume to increase, it only takes 1-2 seconds from the sudden drop of the speed to the engine being pressed and turned off. This time is not enough to control The program responds and makes the speed rise, unless the engine itself has a large reserve torque and can withstand this sudden load increase, it can give the ECU time to react

Therefore, if there is a large peak in the external load change, it will often cause the engine to fail to adapt and stall, affecting normal work

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