Matching method of powerplant parameters to prevent automobile cab from resonating at common speed

A power device and parameter matching technology, which is applied in the fields of motor vehicles, transportation and packaging, etc., can solve problems such as increased cost and complex implementation, and achieve the effects of comprehensive performance improvement, easy implementation, and improved comfort

Inactive Publication Date: 2012-09-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the realization of vibration isolation will be relatively complicated and will increase the cost

Method used

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  • Matching method of powerplant parameters to prevent automobile cab from resonating at common speed
  • Matching method of powerplant parameters to prevent automobile cab from resonating at common speed
  • Matching method of powerplant parameters to prevent automobile cab from resonating at common speed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] 1. The vehicle parameters of a pre-designed light bus are as follows:

[0040] Curb weight: M=2300Kg

[0041] Wheel radius: R=0.3m

[0042] Drag coefficient: C D =0.5

[0043] Windward area: A=3.1m 2

[0044] Transmission efficiency: η t =0.85

[0045] Five-speed transmission ratio

[0046]

i g1

i g2

i g3

i g4

i g5

5.020

2.721

1.602

1.00

0.768

[0047] Transmission ratio of main reducer: i 0 =5.65;

[0048] Gasoline engine rated power: 52Kw (4200-4600r / min);

[0049] Gasoline engine maximum torque: 162N m (2500-3000r / min);

[0050] Minimum fuel consumption rate: 251g / Kw h;

[0051] 2. Avoid the resonance of the cab in the common speed range of the car:

[0052] 1) The roads frequently driven by light passenger vehicles are urban roads, graded roads and expressways. When the car is driving, the urban roads must not exceed 50 kilometers per hour, the grade roads must not ...

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Abstract

The invention discloses a matching method of powerplant parameters to prevent an automobile cab from resonating at a common speed, comprising the following steps of: 1. carrying out a match determination which meets the dynamic property and fuel economy on engine and transmission parameters according to the basic performance of an automobile; 2. preventing the automobile cab from resonating in a common speed range, which comprises: determining the common speed range of the automobile, determining each order natural frequency of the cab and primary vibration modes influencing the comfort of the cab by adopting a finite element analysis model, determining a common speed range in which an excitation frequency of wheel rotating is similar to or coincides with the natural frequency of the cab,and enlarging the wheel radius so that a rotation frequency of the wheels does not coincide with the natural frequency of the cab; and 3. re-checking if parameters of the automobile power transmission device change the optimum state of the dynamic property and fuel economy of the automobile, if not, designing and optimizing the powerplant parameters which meet the dynamic property, fuel economy, and comfort of the automobile according to the operation in step1 to step3.

Description

technical field [0001] The invention is applied in the field of automobile engineering, and more precisely, the invention relates to a parameter matching method of a power device for avoiding resonance in a cab of an automobile at common speeds. Background technique [0002] Automotive power plant parameters refer to the power of the engine and the transmission ratio of the drive train (the transmission ratio of each gear of the transmission and the transmission ratio of the final drive). The power performance, fuel economy and emission characteristics of a car depend to a large extent on the performance of the engine and the selection of the form and parameters of the power transmission device, that is, the degree of reasonable matching of the power transmission system of the car. [0003] At present, when designing and determining the parameters of the automobile transmission device, the main considerations are the power, economy and emission characteristics of the automob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D65/00
Inventor 崔业杰张友坤刘明树卢延辉朱健超
Owner JILIN UNIV
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