Electric control hydraulic reversing method, electric control hydraulic reversing system and engineering machinery

Abstract

The invention provides an electric control hydraulic reversing method, an electric control hydraulic reversing system and engineering machinery. The electric control hydraulic reversing method comprises the following steps: a reversing command is received by a central controller; a gearbox is controlled to execute a neutral gear action; a brake valve is controlled to cause a brake to execute a brake action; a car speed is monitored in a real-time manner through a sensor; when the car speed is reduced to a shift condition, the brake valve is controlled to release the brake; and the gearbox is controlled to execute a reversing geared action. According to the electric control hydraulic reversing method and the electric control hydraulic reversing system provided by the invention, the brake valve and the gearbox are controlled by the central controller, so that a brake speed reduction action, a neutral position action and a shift reversing action after speed reduction, which are operated by an experienced worker, can be automatically completed, the reversing time and travel can be greatly reduced, and meanwhile, and a combination miss of firstly stepping on a brake pedal to reduce the speed and applying the reversing process can be avoided.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to an electronically controlled hydraulic reversing method, system and construction machinery. Background technique [0002] Most construction machinery moves forward and backward frequently. Among them, the motor grader is a kind of earth-rock machinery. Due to the complex working environment and working conditions, it usually performs the corresponding alternate switching actions of forward and backward. It needs to change direction and shift gears at the same time. The speed is reduced until it is zero, and then shifting and shifting are performed after reaching the neutral gear. Usually, this process takes a long time, and the shifting stroke is large. The operator is often eager to change the direction, and directly shifts to the gear without stepping on the brake to slow down. The switch operation implements shifting and shifting gears. If the current speed is high, chan...

AI Technical Summary

Problems solved by technology

[0002] Most construction machinery moves forward and backward frequently. Among them, the motor grader is a kind of earth-rock machinery. Due to the complex working environment and working conditions, it usually performs the corresponding alternate switching actions of forward and backward. It needs to change direction and shift at the same time. In theory, it needs to wait. The speed is reduced until it is zero, and then shifting and shifting are performed after reaching neutral gear. Usually, this process takes a long time, and the shifting stroke is large. Operators are often eager to change direction, and do not step on the brake to slow down, and directly enter the gear position. Gear operation implements shifting and gearing

If the current speed is high, changing the direction will cause a large shifting impact, and at the same time cause problems such as clutch wear, engine reverse drag, and even gearbox parts damage

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