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A static shift quality evaluation method for vehicles equipped with hydromechanical automatic transmission

A technology for automatic transmission and quality evaluation, which is applied in the registration/indication of vehicle operation, instruments, time registers, etc., can solve problems such as imperfect static shift quality, and achieve the effect of improving the driving quality of the whole vehicle

Active Publication Date: 2020-06-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are many studies on the evaluation method of dynamic shift quality, but the evaluation method of static shift quality is not perfect

Method used

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  • A static shift quality evaluation method for vehicles equipped with hydromechanical automatic transmission
  • A static shift quality evaluation method for vehicles equipped with hydromechanical automatic transmission
  • A static shift quality evaluation method for vehicles equipped with hydromechanical automatic transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0096] Taking a 6AT vehicle as an example, its product calibration and demand are sports vehicles, and the static shift test parameters are:

[0097] Δa xvmax =0.42m / s 2 , Δω Eu =89rpm, Δω Eo 38rpm, T r =0.15s, T s =3.26s, according to the calculation, the comprehensive index is:

[0098] S=-0.12, R=-0.98, L=-0.44. After that, comparing the calculated comprehensive index with the judgment standard, it can be seen that all the indexes of the vehicle meet the requirements, that is, the static shift quality of the vehicle meets the use requirements.

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Abstract

The invention discloses a static gear-shifting quality evaluation method for a vehicle equipped with a hydraulic mechanical type automatic transmission. The static gear-shifting quality evaluation method comprises the steps of: step 1, acquiring a maximum chassis acceleration variation Delta a<xvmax> according to a chassis acceleration signal; acquiring an engine rotation speed undershoot value Delta omega<Eu> and an engine rotation speed overshoot value Delta omega<Eo> according to an engine rotation speed signal; acquiring a gear-shifting response time Tr and gear-shifting stabilization timeTs according to a gear-shifting rod position signal; step 2, and acquiring a static gear-shifting comfort index, a response index and a service life index are obtained according to the maximum chassis acceleration variation Delta a<xvmax>, the engine rotation speed undershoot value Delta omega<Eu>, the engine rotation speed overshoot value Delta omega<Eo>, the gear-shifting response time Tr and the gear-shifting stabilization time Ts. The static gear-shifting quality evaluation method adopts the comfort index, the response index and the service life index to evaluate the static gear-shiftingquality of a vehicle from different perspectives, can comprehensively evaluate the static gear-shifting quality of the vehicle, and is of great importance for the improvement of the hydraulic mechanical type automatic transmission control method and the improvement of whole-vehicle driving quality.

Description

technical field [0001] The invention belongs to the technical field of static shift quality evaluation of automatic transmission vehicles, in particular to a method for static shift quality evaluation of vehicles equipped with hydromechanical automatic transmissions. Background technique [0002] The shifting quality of automatic transmission is one of the core contents of automatic transmission control. With the development and popularization of automatic transmission vehicles, people's requirements for shifting quality of automatic transmission are gradually increasing. The shifting quality can be divided into static shifting quality and dynamic shift quality. In the prior art, there are many researches on the evaluation method of dynamic shift quality, but the evaluation method of static shift quality is not perfect. [0003] The hydromechanical automatic transmission is the most mature automatic transmission with the highest market share, and the control of the hydromec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G07C5/08G07C5/00
CPCG07C5/004G07C5/0808
Inventor 付尧雷雨龙姜赟涛李兴忠
Owner JILIN UNIV