Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A shift curve determination method avoiding tractor shift cycle

A technology of shifting curve and determining method, which is applied in mechanical equipment, components with teeth, transmission control and other directions to achieve the effects of improving shifting smoothness, avoiding shifting cycles, and reducing the number of slips and frictions.

Active Publication Date: 2020-09-25
HEFEI UNIV OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a shifting curve determination method for avoiding the shifting cycle under tractor traction operation conditions, so as to solve the shifting cycle problem in the power shifting process of the tractor in the above-mentioned background technology, ensure the stability of the tractor's working speed, and improve the working quality and production efficiency, reduce the number of shifting clutch slippage, and reduce the failure rate of the transmission

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A shift curve determination method avoiding tractor shift cycle
  • A shift curve determination method avoiding tractor shift cycle
  • A shift curve determination method avoiding tractor shift cycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] see Figure 5-7 , a tractor with a four-speed power shift transmission, the power of the matching diesel engine is 58.8kw, and the speed-torque curve of the engine under different throttle openings is fitted according to the experimental data of the engine bench.

[0047] Determine the upshift point and downshift point of the transmission and the corresponding speed of the output shaft of the transmission according to the engine speed-torque curve fitted under different throttle openings according to the engine bench test data

[0048] When taking k T = 1,k w =1, namely: T D =T A / q,n A =n D q, and then determine the output shaft speed of the transmission at the upshift point and downshift point under different throttle openings according to the speed-torque curve, and fit it to the upshift curve under this parameter.

[0049] When taking k T = 1,k w =1.01, namely: T D =T A / q,n A =1.01n D q, and then determine the output shaft speed of the transmission at t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a gear shifting curve determination method for avoiding a tractor gear shifting cycle. The gear shifting curve determination method comprises the following steps of obtaining the current accelerator opening degree of a tractor and the rotating speed and torque curve of an engine at the current accelerator opening degree; calculating transmission output shaft rotating speedscorresponding to an upshift point and a downshift point of a transmission at the current accelerator opening degree through the rotating speed and torque curve of the engine; changing the acceleratoropening degree and obtaining transmission output shaft rotating speeds of the upshift point and the downshift point of the transmission at different accelerator opening degrees; and compounding different accelerator opening degrees and the transmission output shaft rotating speeds of the upshift point and the downshift point of the transmission at different accelerator opening degrees into a gearshifting curve. The gear shifting curve determination method has the beneficial effects that the gear shifting cycle can be effectively avoided in the power gear shifting process, it is guaranteed that the working speed of the tractor is stable, the working quality and the working efficiency are improved, the frequency of invalid gear shifting clutch sliding friction can also be reduced, the failure rate of the transmission is lowered, and meanwhile the gear shifting smoothness is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle automatic transmission control, in particular to a method for determining a shift curve that avoids a tractor shift cycle. Background technique [0002] Tractor work has the following characteristics: (1) Affected by agronomy and implement carrying capacity, it generally moves at a uniform speed; (2) The working resistance will fluctuate, and the traditional manual transmission is difficult to adapt to the change of working resistance, so it is necessary to stop and change gears; when the tractor is pulling , the working resistance becomes larger, the diesel engine is easy to stall due to overload, and it needs to be stopped to change gears, which affects productivity; the working resistance becomes smaller, and the fuel economy of the diesel engine deteriorates. By adopting the power shift technology, it can overcome the problem of frequent parking and shifting caused by the change of working res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02F16H59/18F16H59/36F16H59/74F16H59/40
CPCF16H59/18F16H59/36F16H59/40F16H59/74F16H61/0204F16H2061/0227
Inventor 夏光高军杨猛张洋闫瑞琦郑友郭东云滑杨莹许立平石鹏赵名卓
Owner HEFEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com