A method, system and agricultural machinery for realizing median parking based on electronically controlled HMT

Abstract

The invention relates to a method, a system and an agricultural machine for realizing median parking based on an electronically controlled HMT. The method includes: acquiring the rotational speed of a first shaft of the gearbox, the rotational speed of the motor and the rotational speed of the output shaft of the gearbox in real time; Planet carrier speed; in the vehicle calibration mode, the vehicle state is calibrated according to the gearbox output shaft speed and the planet carrier speed, and the vehicle state calibration current value is obtained; when the vehicle state changes and the preset conditions are met, the PID strategy is used according to the planet carrier. The PID adjustment current value is determined by the speed target value and the planet carrier speed actual value; the median current value is determined according to the sum of the vehicle state calibration current value and the PID adjustment current value, and the median current value is assigned to the solenoid valve corresponding to the vehicle state. The invention determines the state of the vehicle according to the speed of the output shaft of the gearbox, adjusts the current of the corresponding solenoid valve in real time according to the speed of the first shaft of the gearbox and the speed of the motor, and then adjusts the speed of the motor, so that the vehicle speed is zero and the car does not slip in the neutral position.

Description

technical field [0001] The invention relates to the technical field of electronically controlled HMT, in particular to a method, system and agricultural machinery for realizing median parking based on electronically controlled HMT. Background technique [0002] The planet carrier mechanism in the HMT gearbox is composed of a sun gear, a ring gear and a planet carrier. The ring gear transmits the power of the engine, and the sun gear transmits the hydraulic power of the electronically controlled proportional variable pump and the motor. However, the volumetric efficiency of the variable pump is affected by the ambient temperature and the use time. The volumetric efficiency of the hydraulic power decreases with the increase of the use time. When the handle is in the neutral position, the mechanical power is greater than the hydraulic power. situation, causing the vehicle to slide forward. SUMMARY OF THE INVENTION [0003] The technical problem to be solved by the present in...

AI Technical Summary

Problems solved by technology

However, the volumetric efficiency of the variable pump is affected by the ambient temperature and the use time. The volumetric efficiency of the hydraulic power decreases with the increase of the use time, and when the handle is in the neutral position, the mechanical power is greater than the hydraulic power. situation, causing the vehicle to slip ahead

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