Method for controlling power limit load of caterpillar crane

Abstract

The invention discloses a method for controlling power limit load of a caterpillar crane. A control system thereof comprises a foot plate accelerator, a hydraulic pump, a controller and an engine, wherein, the engine is connected with a hydraulic pump by a dividing box, the foot plate accelerator is connected with the ECM accelerator input end of the engine. The engine of the invention is an EFI engine, the hydraulic pump is a proportional electronically controlled hydraulic pump, the controller is connected with the engine ECM by a CAN bus, and a PWM output port of the controller is connected with a proportional solenoid of an adjusting hydraulic pump oscillation angle. When the engine is in idle load, the engine is standardized according to a torque-rotating speed curve of the accelerator of the engine; when the engine is in load, the controller collects information on the engine according to the CAN bus; the oscillation angle of the electronically controlled hydraulic pump is adjusted by adjusting PID of the controller, so that input power of a hydraulic system is adjusted to match with the power of the engine, thus realizing operation of the engine without stalling. The control method of the invention can reduce oil consumption, lengthen service life of the engine and protect the hydraulic system from impact; in addition, the method features simple circuits, convenient realization and low cost.

Description

1. Technical field [0001] The invention relates to a control method for matching the engine power of a crawler crane with the power of a hydraulic system. 2. Background technology [0002] The engine of the crawler crane is connected to the hydraulic pump through the indexing box, and the pedal accelerator is directly connected to the engine ECM. The operator can adjust the output power of the engine by stepping on the pedal accelerator, and the engine directly transmits the torque to the hydraulic pump through the indexing box , so as to control the output power of the hydraulic system. When the engine works at a certain speed, its output power is constant. If the current input power of the pump is greater than the output power of the engine, the engine will slow down to ensure the maximum torque. It will cause the engine to stall. This has a great impact on hoisting work and engine life, and may lead to danger in severe cases. [0003] There are serious deficiencies in ...

AI Technical Summary

Problems solved by technology

This has a great impact on hoisting work and engine life, and may lead to danger in severe cases

[0003] There are serious deficiencies in the above traditional method: the engine is easy to stall during the hoisting operation, which affects normal work; frequent stalls and stalls affect the service life of the engine; the impact on the hydraulic system is relatively large

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