Gear shifting control method, system and engineering machinery used for traction operation

Abstract

The invention discloses a gear shifting control method, a system and engineering machinery used for traction operation, wherein the gear shifting control method comprises the following steps of: obtaining turbine torque, engine torque and gear position signals under the current throttle state; keeping a current gear position when judging the gear position signals are hollow gear signals, or else, calculating to obtain the torque ratio, wherein the torque ratio is a ratio of the turbine torque to the engine torque; if the torque ratio is in the range of the preset torque ratio, keeping the current gear position; rising the gear position when the torque ratio is less than the minimal torque ratio in the preset torque ratio range, and the gear position signals are judged not the highest gear signals; and lowering the gear position when the torque ratio is greater than the maximum torque ratio in the preset torque ratio range, and the gear position signals are judged not the lowest gear signals.

Description

technical field [0001] The present invention relates to the technical field of engineering machinery, more specifically, to a shift control method, system and engineering machinery used for traction work. Background technique [0002] In order to improve the adaptability of construction machinery to harsh operating environments and working conditions, a hydraulic torque converter is added to the transmission system of traditional construction machinery for hydraulic mechanical transmission. This hydromechanical transmission device has many advantages of both hydraulic transmission and mechanical transmission, such as smooth start, rapid acceleration, etc.; at the same time, the transmission of power through liquid can reduce the dynamic load and vibration of the transmission system and prolong the use of the transmission system. Life, improve vehicle driving safety and passability. Generally, as long as the matching is reasonable, the problem of "flame-out" of the engine un...

AI Technical Summary

Problems solved by technology

Since the operating conditions of engineering vehicles are obviously different from those of automobiles, the automatic shifting technology of automobiles cannot be fully adapted to construction machinery.

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