Crane power matching control method and system and crane

Abstract

The invention relates to a crane power matching control method and system and a crane, and the control method comprises the steps: outputting a control current proportional to the angle of an operation handle according to the angle of the operation handle, so as to control the opening degree of a multi-way valve; calculating the required power of the hydraulic pump according to the control current, the position of the accelerator pedal and the outlet pressure of the hydraulic pump; according to a preset optimal working curve of the engine, obtaining the optimal rotating speed of the engine corresponding to the required power, so that the oil consumption of the engine is minimum; and controlling the engine to operate at the optimal rotating speed. According to the control method, the enginealways works under the working condition with the optimal fuel economy through a power matching algorithm according to the operation of a user on an operating handle and an accelerator pedal, and theworking condition that the engine works under the low-speed large-load or high-speed small-load condition is avoided; and the operation difficulty can be reduced without depending on the experience of a user.

Description

technical field [0001] The invention relates to the field of engineering machinery control, in particular to a crane power matching control method and system, and a crane. Background technique [0002] At present, the truck cranes using electronically controlled proportional multi-way valve and load-sensing pump system have the following characteristics: the handle and throttle separately control the opening of the proportional multi-way valve and the speed of the engine; the set pressure difference of the load-sensing pump is a constant value; The system flow determined by the proportional multi-way valve opening is equal to the system flow determined by the pump displacement and engine speed. [0003] When the engine speed operated by the user is high enough, in order to make the flow determined by the pump adapt to the flow determined by the proportional multi-way valve, the displacement of the pump must be smaller than the maximum displacement of the pump, and if it happ...

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Problems solved by technology

[0003] When the engine speed operated by the user is high enough, in order to make the flow determined by the pump adapt to the flow determined by the proportional multi-way valve, the displacement of the pump must be smaller than the maximum displacement of the pump, and if it happens to be light load at this time, the engine It works in the condition of high speed and small load torque, and the fuel economy is poor

[0004] At present, in the use of truck cranes using electronically controlled proportional multi-way valves and load-sensitive pump systems, in order to obtain better engine fuel economy, it is necessary to match the inclination angle of the handle and the inclination angle of the throttle based on experience. Work in the best condition of fuel economy

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