High-horsepower tractor down-shift control method considering speed regulation characteristic of diesel engine

A technology of power downshifting and control methods, which is applied in the direction of transmission control, mechanical equipment, and components with teeth, etc., can solve the problems of transmission system component damage, diesel engine flameout, and large power loss, so as to avoid parking and downshifting. gears, reduce shifting time, and avoid parasitic power effects

Active Publication Date: 2017-09-12
HEFEI UNIV OF TECH
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  • Claims
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Problems solved by technology

In the process of power downshifting, it is necessary to reasonably control the actuating pressure of the disengagement and engagement clutches. Since the diesel engine generally works in the speed regulation area, when the diesel engine speed decreases due to the increase of the load, the torque of the diesel engine increases, and when the torque of the diesel engine increases Large, the speed of the dies

Method used

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  • High-horsepower tractor down-shift control method considering speed regulation characteristic of diesel engine
  • High-horsepower tractor down-shift control method considering speed regulation characteristic of diesel engine
  • High-horsepower tractor down-shift control method considering speed regulation characteristic of diesel engine

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Example Embodiment

[0076] Embodiment: This embodiment uses the tractor upshift control method of the present invention to perform 4 downshift and 3 downshift control on a certain model of high-horsepower tractor power shift transmission.

[0077] Refer to figure 2 , C 1 , C 2 , C 3 And C 4 Respectively for the shift clutch, when clutch C 1 , C 2 Disengage, clutch C 3 , C 4 When engaged, the power shift transmission gear is 4th; when clutch C 1 , C 4 Engaged, clutch C 2 , C 3 When disengaged, the power shift transmission gear is 3 gears; when the transmission gear is down from 4 gears to 3 gears, clutch C 1 From the disengaged state to the engaged state, clutch C 3 From the engaged state to the disengaged state, the power flow gradually from the clutch C 3 Transition to clutch C 1 ;

[0078] The power system parameters of a high-horsepower tractor are as follows: the maximum torque transmitted by the clutch is 380N.m; the engine is a diesel engine, the rated power is 100kw, the throttle opening is 80%;...

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Abstract

The invention discloses a high-horsepower tractor down-shift control method considering the speed regulation characteristic of a diesel engine. The high-horsepower tractor down-shift control method considering the speed regulation characteristic of the diesel engine comprises the steps that firstly, the power down-shift control parameter of a tractor is determined; and secondly, the power down-shift control process of the tractor is divided into a shift preparation stage, a rotation speed synchronizing stage, a gear overlapping stage and an engaging strengthening stage, then the purpose that in the power down-shift process, a variable-speed transmission system always keeps a large output torque is achieved, and meanwhile it is guaranteed that the diesel engine avoids flameout. In this way, the tractor can be adapted to change of work resistance and continuously operate, and the operation efficiency is guaranteed.

Description

technical field [0001] The invention belongs to the field of high-horsepower tractor power transmission system control, and specifically relates to a downshift control method for a multi-clutch high-horsepower tractor power transmission system. 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 t...

Claims

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Application Information

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IPC IPC(8): F16H61/02F16H61/26F16H59/56
CPCF16H59/56F16H61/0204F16H61/26
Inventor 夏光施信信邹斌闫瑞琦郑友滑杨莹郭东云杜克谢海
Owner HEFEI UNIV OF TECH
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