A downshift control method for constant torque power of a high-horsepower tractor

Abstract

The invention discloses a constant-torque power down-shift control method of a high-horsepower tractor. The power down-shift control process of the tractor is divided into a gear shifting preparation phase, a rotating speed synchronization phase, a gear overlap phase and a gear reinforcement phase; and through coordinative control of a joint clutch, a separation clutch and an engine, the purpose of a speed change transmission system always keeping constant-torque output in the power down-shift process is realized, so that the power gear shifting of the tractor is smooth without impact.

Description

technical field [0001] The invention belongs to the field of tractor power shift control, and specifically relates to a downshift control method for constant torque power of a multi-clutch high-horsepower tractor. technical background [0002] Tractor work has the following characteristics: (1) Affected by agronomy and implement carrying capacity, it generally moves at a constant speed; (2) In order to improve productivity, the throttle opening is generally above 80%; (3) The working resistance will fluctuate, which is difficult for traditional manual transmissions. To adapt to changes in working resistance, it is necessary to stop and change gears; in view of the operating characteristics of tractors, a 'Power Shift' (power shift) transmission system has been proposed abroad, and the cost of tractors equipped with this transmission system is also relatively high. The transmission system effectively expands the working resistance range of the tractor's continuous work, avoid...

AI Technical Summary

Problems solved by technology

Parasitic power, also known as circulating power, can cause significant damage to drivetrain components in addition to unnecessary energy loss

There are many forms of tractor operation, such as traction, rotary tillage and harvesting. When operating, the power downshift needs to ensure the quality and efficiency of the tractor’s work. If the output torque of the tractor changes too much during the downshift, the operation quality cannot be guaranteed, which is easy It will cause damage to the implements, and at the same time, there will be upshifts and frustrations, which will affect the smoothness of downshifts, and it is difficult to achieve constant torque output during power downshifts only by controlling the shift clutch of a high-horsepower tractor.

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