Control method for power upshift of high-horsepower tractor considering the characteristics of diesel engine speed regulation

Abstract

The invention discloses a high-horsepower tractor power upshift control method taking the governor control characteristic of the diesel engine into consideration. The power upshift control method comprises the following steps: 1, determining the power upshift control parameters of the tractor; 2, dividing the power upshift control process of the tractor into a gear-shifting preparation stage, a shift overlap stage, a rotating speed synchronizing stage and a shift reinforcing stage. According to the high-horsepower tractor power upshift control method taking the governor control characteristic of the diesel engine into consideration, the purpose that the variable transmission system always maintains a larger output torque during the power upshift process is realized, the diesel engine is prevented from flameout, the tractor can be adaptable to working resistance changes to realize continuous operation, and the working efficiency can be ensured.

Description

technical field [0001] The invention belongs to the field of tractor power shift control, and specifically relates to a power shift control method for multi-clutch high-horsepower tractors. Background technique [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, avoids the frequent parking a...

AI Technical Summary

Problems solved by technology

Power upshift is a part of power shift technology. During the power upshift process, it is necessary to reasonably control the actuating pressure of the separation and engagement clutches. Since diesel engines generally work in the speed regulation area, when the load increases and the diesel engine speed drops, The torque of the diesel engine increases. When the torque of the diesel engine increases, the speed of the diesel engine rises. If the shift control is unreasonable, it will cause excessive power loss or the diesel engine will stall.

[0004] In the process of clutch pressure control, it is especially necessary to avoid the generation of parasitic power, which is also called circulating power. In addition to causing unnecessary energy loss, this power will also cause great damage to the components of the transmission system.

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