Loader gear and speed automatic control system and control method

Abstract

The invention discloses a loader gear and speed automatic control system and control method. The loader gear and speed automatic control system is characterized in that a gearbox gear input request signal is monitored through a gear selection unit; an engine throttle opening, an engine torque, an engine rotating speed, a gearbox rotating speed and a vehicle speed signal are collected through a vehicle state monitoring module; a controller controls the vehicle state monitoring module to monitor the current state of a vehicle and compares with a preset condition, controls a gear actuator to be switched between a first gear and a current gear n according to a comparison result, or sends a rotating speed reduction control command to an engine controller to adjust the engine rotating speed so as to make the vehicle speeds of a n+1 gear consistent with the n gear while controlling a gear shift actuator to rise to the n+1 gear from the current gear n. The loader gear and speed automatic control system disclosed by the invention solves the problem that the vehicle speed, gear and engine of a loader are optimally matched under driving working conditions with different shovel loading distance, and achieves the best power performance under the short-distance operation working conditions and the best economy under the long-distance operation working conditions.

Description

technical field [0001] The invention relates to a construction machinery control system and control method, in particular to a loader gear and speed automatic control system. Background technique [0002] Wheel loader is a kind of construction equipment mainly engaged in shovel loading operations. During the shovel loading process, according to the difference in construction conditions, the driving distance of the shovel loading cycle operation varies greatly. Under short-distance shoveling conditions, the driving distance is short, and the vehicle is in a state of constant acceleration and deceleration and gear switching, which requires high power performance; under long-distance shoveling conditions, the driving distance is long, and the vehicle is in a fixed gear, The proportion of constant speed state is increased. The engine power of loaders is generally configured to meet the requirements of shovel loading conditions. There is a surplus of engine power under constant...

AI Technical Summary

Problems solved by technology

[0006] The invention proposes an automatic control system and control method for the gear position and vehicle speed of a loader, which solves the problem of optimal matching between the vehicle speed, gear position and engine of the loader under different shoveling distance driving conditions, and achieves a The best dynamic performance and the best economical effect in long-distance working conditions

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