Hydraulic-mechanical transmission engineering machinery automatic shifting speed variator and control method

Abstract

The invention relates to a mechanical automatic shift speed-changing device in hydraulic mechanical transmission engineering and a control method thereof. The device comprises an electro-hydraulic shift speed-changing unit, an electro-hydraulic engine, a microcomputer controller, an electro-hydraulic motor controller, a transmission case output rotational speed sensor, a shifting handle switch, a shifting mode selection switch, a brake pressure switch and an automatic direction switch. The electro-hydraulic motor controller is communicated with the microcomputer controller. The transmission case output rotational speed sensor, a torque converter turbine speed sensor, a shifting handle, the shifting mode selection switch, the brake pressure switch and the automatic direction switch serve to input signals to the input port of the microcomputer controller. The microcomputer controller serves to input control signals to a transmission case control module by the output port thereof. Based on the combination of two shift methods, the inventive device has the advantages of good economical efficiency, power efficiency and practicability, low energy consumption, automatic shift with high work efficiency, less working time, reduced labor intensity of the driver, and suitability for various working conditions.

Description

technical field [0001] The invention belongs to a hydromechanical transmission engineering machine, in particular to an automatic gear shifting device and a control method of the hydraulic mechanical transmission engineering machine. Background technique [0002] In order to improve the adaptability to external loads of currently known mobile construction machinery such as loaders, the main drive system usually adopts the form of hydromechanical transmission. The power of the internal combustion engine, through the torque converter and gearbox, finally drives the whole machine Mechanism (transaxle and tire system). However, the transmission efficiency of the hydromechanical transmission is low, especially when the heavy load requires a large output, the transmission efficiency of the hydraulic torque converter drops sharply, or even drops to zero, which reduces the working efficiency and causes waste of energy. The wasted energy increases the oil temperature, brings about ...

AI Technical Summary

Problems solved by technology

When the loader is working continuously, the number of shifts is hundreds of times per hour, and the shifting operation is very frequent. During the operation, it is necessary not only to control the walking, but also to operate the working device. Frequent shifting operations distract the driver's attention and affect the Increased productivity, but also increased the unsafe factors of walking

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