Control system and method for matching excavator power

Abstract

The present invention provides a control system and method for matching excavator power, wherein the method comprises the steps of: setting a limit load control current value corresponding to various gears of an engine; detecting the position of a gear knob and determining the current gear of the engine; searching the limit load control current value corresponding to the current gear from the limit load control current values corresponding to various gears of the engine; and supplying a limit load control current with the size of the limit load control current value to the limit load control proportional valve for controlling an absorbed power of a hydraulic pump. The method prevents the engine from seriously turning when the excavator begins to work; frequent revolving speed adjustments are not needed for powers are not matched; and the load of the engine is reduced.

Description

technical field [0001] The invention relates to an excavator power matching control system and method, in particular to a power matching control system and method of an excavator engine and a hydraulic pump. Background technique [0002] Excavator is a kind of engineering machinery widely used in building construction, which has the advantages of flexible construction and high construction efficiency. Such as figure 1 A schematic diagram showing the structure of the existing excavator power matching control system, such as figure 1 As shown, the excavator power matching control system includes a gear knob, an engine 1, a hydraulic pump 2, a speed sensor 4 and a controller 3, and the gear knob is used to control the gear of the engine 1; the speed sensor 4 Used to detect the rotational speed of the engine 1; the hydraulic pump 2 is connected to the engine 1 through a transmission mechanism, and the hydraulic pump 2 includes a limit load control proportional valve 5 for cont...

AI Technical Summary

Problems solved by technology

Since the adjustment of the limit load control proportional valve 5 takes a certain amount of time, the engine speed has dropped by 500-600 rpm when the limit load control really works, so although it can ensure that the car will not be suffocated when the load is too large , but it cannot eliminate the phenomenon that the engine 1 is seriously lost when the excavator starts to operate, and because of the sudden opening of the limit load control, it will also cause a sudden stop of the excavator

[0006] In addition, because the load of the excavator changes greatly and frequently during operation, and the limit load control current determines the maximum output power of the engine 1, so using the above-mentioned PID control algorithm for control will lead to frequent changes in the limit load control current, As a result, the engine speed is unstable and the burden on the engine is increased.

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