Overload protection control method, device and system and engineering machinery

Abstract

The invention discloses an overload protection control method, device and system of a hydraulic system of engineering machinery and the engineering machinery. The method comprises the following steps of: acquiring the current torque of an engine when the engineering machinery is in an idling state without operation actions; and outputting overflow valve calibration prompt information when the value of the current torque is more than a set torque threshold which equals, wherein the set torque is equal to the torque of the engine when the overload protection on an overflow valve is in a set out-of-alignment critical state. According to the overload protection control method, device and system, and the engineering machinery, an operator can be prompted to perform relative calibration operation on the overflow valve by the overflow valve calibration prompt information, and thus resource waste caused by inaccurate overload protection on the overflow valve can be greatly reduced.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an overload protection control method, device, and system of a hydraulic system of an engineering machinery and an engineering machinery. Background technique [0002] In the hydraulic constant pressure system of various construction machinery such as concrete pump trucks, the relief valve is a necessary pressure control element. Its main function is: when the pressure of the hydraulic system reaches the set pressure of the relief valve, the relief valve will Start flooding to prevent system overload and thus ensure system safety. [0003] Such as figure 1 As shown, the hydraulic system of construction machinery generally includes: engine 4 , oil tank 10 , hydraulic pump 1 , swing cylinder 3 , overflow valve 2 and accumulator 5 . The engine 4 serves as a power source to drive the power element hydraulic pump 1 to supply oil to the hydraulic system, and the hydraul...

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Problems solved by technology

[0005] Due to the difference in the control performance of each relief valve, or as the service life of the relief valve increases, the control performance of the relief valve will also decline or even be damaged. At this time, the overload protection of the relief valve may be inaccurate. That is, the system pressure is still within a constant pressure range, but the relief valve has begun to overflow, resulting in an increase in the load on the hydraulic pump and an increase in engine power, resulting in energy waste

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