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Automobile hub power characteristic rapid measuring method

A technology of power characteristics and wheel power, which is applied in the direction of measuring the traction/propulsion power of vehicles, and can solve problems such as affecting the lubrication effect of transmission parts, overheating tires, and reducing test safety.

Inactive Publication Date: 2004-04-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when testing the power characteristics of automobile wheels at home and abroad, the duration of this process is generally long, which seriously affects the test efficiency of power characteristics of automobile wheels. , the speed stabilization time is long, the test duration is long, the heat load of the engine is very large, and the temperature of the engine body is very high, which will cause the engine coolant to splash, which has a great impact on the service life of the engine. The car transmission system runs at full load and high speed , the temperature of the lubricating oil is very high and becomes thinner, which affects the lubrication effect of the transmission parts and has a great impact on the service life of the automobile transmission system. It is much larger. The wheels run on the drum repeatedly, and the tires only contact the limited surface of the drum of the chassis dynamometer. If the wheels run at high speed for a long time, the heat generated by the hysteretic deformation of the tires cannot be dissipated in time. The overheating of the tires will cause the tread rubber to fall off, which will greatly reduce the service life of the tires. In severe cases, it will cause a tire blowout and a test accident. tested security
Because the engine, drive train, and tires are not working properly, the obtained wheel power characteristics are not accurate.
So far at home and abroad, the technology adopted to solve the problems of overheating of the engine and tires and abnormal operation of the transmission system caused by the power sweep duration is too long: after the engine or tires are overheated, quickly release the accelerator pedal, turn off the engine, The cooling fan makes the engine and tires cool down forcibly, and the test continues after the engine and tires have cooled to a certain extent, so the whole test process takes a long time, and this method is also suitable for the smoke emission test of diesel vehicles under loading and deceleration conditions. Not feasible, so it is important to quickly test the power characteristics of the car wheel

Method used

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  • Automobile hub power characteristic rapid measuring method
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  • Automobile hub power characteristic rapid measuring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] in the attached Figure 4 In the test of vehicle wheel power characteristics, first adjust the accelerator pedal limit device to limit the maximum travel of the accelerator pedal, that is, determine the maximum opening of the throttle. Apply a small constant moment load to the dynamometer, accelerate the vehicle on the chassis dynamometer, step on the accelerator gradually to a limited position and fix the gear, and obtain the vehicle that the gear can reach in the wheel power test under the throttle opening Maximum travel speed νmax and the corresponding chassis dynamometer load P s . Select different gears, and sequentially obtain the maximum driving speed and chassis dynamometer load of each gear under this throttle opening.

[0076] Select the gear for the wheel power characteristic test, set the same constant moment load on the chassis dynamometer as the maximum driving speed of each gear, and gradually shift the vehicle to the pre-selected gear, if the first gea...

Embodiment 2

[0078] as attached Figure 5 , attached Figure 6 And attached Figure 7 Shown are the wheelside power characteristic curves of the Jetta GTX car when the throttle opening is 30%, the first gear, the third gear and the fourth gear, the curve 1 is the sampling period of 500ms, the wheelside power characteristic curve before correction, and the curve 2 is The sampling period is 500ms, and the wheel side power characteristic curve after correction, curve 3 is the wheel side power characteristic curve after the sampling period is 5s, that is, the vehicle speed is fully stable. Taking the test result with a sampling period of 5s as the accurate value, it can be seen that when the sampling period is 500ms, the deviation of the test result before correction from the accurate value varies with the gear position and vehicle speed. The higher the gear position, the higher the vehicle speed, the deviation The larger the value, the corrected result is not affected by the gear position a...

Embodiment 3

[0084] as attached Figure 8 , attached Figure 9 And attached Figure 10 Shown are the wheelside power characteristic curves of Jetta GTX car when the throttle opening is 100%, the first gear, the third gear and the fourth gear, the curve 1 is the sampling period 500ms, the wheelside power characteristic curve before correction, and the curve 2 is The sampling period is 500ms, and the wheel side power characteristic curve after correction, curve 3 is the wheel side power characteristic curve after the sampling period is 5s, that is, the vehicle speed is fully stable. Taking the test result with a sampling period of 5s as the accurate value, it can be seen that when the sampling period is 500ms, the deviation of the test result before correction from the accurate value varies with the gear position and vehicle speed. The higher the gear position, the higher the vehicle speed, the deviation The larger the value, the corrected result is not affected by the gear position and ve...

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Abstract

The present invention relates to a method for quickly testing car wheel edge powder characteristics. It is characterized by that according to a certain testing process it can use chassis dynamometer machine to test the power characteristics of car wheel edge. Under the condition of that the drum speed of the chassis dynamometer machine is changed with car wheel, but is not stable, i.e. when the drum implements variable motion in a certain rotational speed, the absorption power value of the chassis dynamometer machine can be measured, and an inaccurate wheel edge power value under said speed can be obtained, then the inaccurate wheel edge power value can be corrected so as to obtain the accurate wheel edge power value.

Description

Technical field [0001] The invention relates to a method for testing the power characteristic of the wheel of an automobile, in particular to a method for quickly testing the power characteristic of the wheel of the automobile based on a chassis dynamometer to obtain the power characteristic of the wheel of the automobile. Background technique [0002] Currently, the state of the art for rapid testing of wheel power characteristics of vehicles using chassis dynamometers is nil. [0003] Obtaining the wheel power characteristics is the most important test item when conducting vehicle dynamic performance tests and diesel vehicle load-deceleration conditions smoke emission tests. The wheel power characteristic of the automobile refers to the relationship between the power of the engine output power transmitted to the wheels through a certain gear of the transmission system and the driving speed of the vehicle when the throttle opening of the engine is constant. Since the automo...

Claims

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Application Information

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IPC IPC(8): G01L5/13
Inventor 刘昭度马岳峰齐志权崔海峰姚圣卓张景波
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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