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Correction Method of Automobile Free-Sliding Drive Train Resistance

A technology for power trains and automobiles, which is used in vehicle testing, machine/structural component testing, instrumentation, etc., to solve problems such as correction, engine power error, and large difference in power train resistance.

Active Publication Date: 2019-01-01
吴明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Car bench test or road test to detect engine power, can measure the system deceleration and system resistance Fs at the specified speed point through neutral gear or disengage the clutch free slide, the system resistance Fs detected by bench test free slide is equal to the bench resistance of the chassis dynamometer The sum of Ft, the wheel roller resistance Fg, and the drive train resistance Fc of the free-skating vehicle. The torque transmitted by the vehicle's drive train under the loading condition is different from that under the free gliding condition, and the resistance of the drive train under the two conditions is quite different. There are technologies that do not correct the resistance of the free-sliding drive train of the car to the drive train resistance of the loading condition, which will easily cause a large error in the detection of engine power

Method used

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Examples

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Embodiment Construction

[0009] Use a van truck to detect the engine power to illustrate the specific implementation of the correction method for the free-sliding driveline resistance of the car. The engine rated power is 105kW, and the actual rated power of the engine is detected.

[0010] Detect the rated power vehicle speed of 82.3km / h, and measure the loading force of the eddy current machine at this speed point in a steady state Fd=2020.9N, load power Pd=2020.9×82.3 / 3600=46.2kW, and measure the free sliding system resistance Fs=813.6N, The system resistance power Ps=813.6×82.3 / 3600=18.6kW, and the loss power of the engine accessories is set to 0.1×105=10.5kW. If the transmission resistance is not corrected, the measured engine power is 46.2+18.6+10.5=75.3kW. Correct the drive train resistance, take the drive train efficiency η=0.85 of the truck model statistics, and the corrected load condition system resistance is Fs-Fd+Fd / η=813.6-2020.9+2020.9 / 0.85=1170.2N, after correction The system resistan...

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Abstract

The invention provides a correction method for automobile free sliding drive system resistance. When the engine power is detected in the automobile platform test or road test, the load is set to only affect the automobile drive system resistance Fc under the automobile free sliding condition, and the difference of the automobile drive system resistance under the loading condition and the free sliding condition is equal to the difference of the system resistance of the two conditions. After the load Fd of the same speed point and the system resistance Fs of free sliding of the automobile are detected, the automobile free sliding system resistance Fs is corrected as the automobile loading condition system resistance Fs-Fd+Fd / eta according to the statistical drive system efficiency eta of the vehicle class to which the detected automobile belongs or the automobile free sliding drive system resistance Fc is corrected as the loading condition drive system resistance Fc-Fd+Fd / eta, the engine power Pe=Pj+(Fs+Fd / eta)xVi / 3600 is detected and Pj is the engine accessory loss power.

Description

technical field [0001] The method for correcting the resistance of the free-sliding transmission system of the automobile is to correct the resistance of the transmission system when the vehicle is free-sliding without loading and to the resistance of the transmission under the loading condition when the engine power is detected by the automobile bench test or road test, thereby improving the detection efficiency. The invention relates to a method for the power accuracy of an automobile engine, which belongs to the technical field of automobile performance detection. Background technique [0002] Car bench test or road test to detect engine power, can measure system deceleration and system resistance Fs at specified speed points through neutral gear or disengage clutch free coasting, system resistance Fs detected by bench test free coasting is equal to bench resistance of chassis dynamometer The sum of Ft, the wheel roller resistance Fg, and the drive train resistance Fc of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 吴明
Owner 吴明