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Transmission ratio obtaining method for improving vehicle power performance

A technology of vehicle power and acquisition method, applied in the field of vehicle transmission, can solve problems such as difficulty in realization, and achieve the effects of good versatility, improved power performance, and high transmission ratio acquisition efficiency.

Active Publication Date: 2020-08-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the above optimization methods all rely on accurate models, which are difficult to implement

Method used

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  • Transmission ratio obtaining method for improving vehicle power performance
  • Transmission ratio obtaining method for improving vehicle power performance
  • Transmission ratio obtaining method for improving vehicle power performance

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A certain vehicle is selected as an example. The original vehicle is a hydraulic-mechanical six-speed transmission. The parameters and performance indicators of the vehicle are shown in Table 1.

[0058] Table 1 vehicle parameters

[0059]

[0060] Such as figure 1 As shown, a transmission ratio acquisition method for improving vehicle dynamic performance disclosed in this embodiment, the specific implementation steps are as follows:

[0061] Step 1: Determine the upper boundary i of the transmission ratio according to the vehicle parameters, design indicators and road adhesion max . The vehicle parameters include the vehicle mass m, the rolling resistance coefficient f, the maximum driving torque T of the power source tmax , driving wheel radius r z , road surface adhesion coefficient Main gear ratio i 0 . The design index includes the maximum gradeability β max , road adhesion F t . The upper boundary of the vehicle transmission ratio i max The determinat...

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Abstract

The invention discloses a transmission ratio obtaining method for improving vehicle power performance, and belongs to the technical field of vehicle transmission. The implementation method comprises the steps of determining the upper boundary of the transmission ratio according to vehicle parameters, design indexes and road adhesion; determining a transmission ratio lower boundary according to thehighest vehicle speed, the wheel radius, main transmission and the maximum rotating speed of a power system; on the basis of a gradient speed ratio differential acquisition formula, acquiring an improved dynamic transmission ratio formula by increasing an adjustment coefficient; according to different power performance requirements, selecting corresponding adjustment coefficients and substitutingthe maximum transmission ratio, the minimum transmission ratio and the gear number into an improved power transmission ratio acquisition formula to obtain a transmission ratio meeting the corresponding performance requirements, so that the power performance of the vehicle under different performance requirements is improved, and the performance of a vehicle power device is brought into full play.According to the method, the high vehicle power performance transmission ratio is obtained through a formula analysis method, dependence on an accurate model is not needed, and the method has the advantages of being good in universality and high in transmission ratio obtaining efficiency.

Description

technical field [0001] The invention relates to a method for obtaining a transmission ratio of a vehicle transmission, in particular to a method for obtaining a transmission ratio for improving vehicle dynamic performance, and belongs to the technical field of vehicle transmission. Background technique [0002] The optimal matching of the transmission system is one of the main ways to improve the dynamic performance of the vehicle, and the transmission ratio is a key parameter of the transmission system, which has a great influence on the performance of the vehicle. At present, the traditional design method of the transmission ratio is mainly based on the empirical design method, and the acquisition of the transmission ratio is the most commonly used method. Therefore, the optimal acceleration performance cannot be obtained by adopting the traditional transmission ratio acquisition method. In recent years, optimization algorithms have been applied to the optimization of tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/17G06F30/20G06F111/10G06F119/14
CPCG06F30/15G06F30/17G06F30/20G06F2111/10G06F2119/14
Inventor 吴维罗俊林李博苑士华
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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