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Statistical method of system resistance based on road test and bench test about car in free running at neutral position

A statistical method and resistance technology, which is used in vehicle testing, machine/structural component testing, measuring devices, etc., and can solve the problems of large workload, inability to perform calculation and determination, and inconvenient and fast operation.

Inactive Publication Date: 2006-02-01
吴明
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Problems solved by technology

The system resistance at each speed point of the vehicle's neutral coasting road test can be determined by the test method and the calculation method. The test method requires a lot of work, and the calculation method requires many parameters of the vehicle to be calculated. Once these parameters are lacking, the calculation cannot be determined.
At present, the resistance at each speed point of the car bench test system can be detected by the anti-drag power method, the anti-drag reaction force method, the free and loaded two-time sliding method, and the two-time free sliding method of increasing and decreasing inertia, which is not very convenient and difficult to operate. fast

Method used

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  • Statistical method of system resistance based on road test and bench test about car in free running at neutral position
  • Statistical method of system resistance based on road test and bench test about car in free running at neutral position
  • Statistical method of system resistance based on road test and bench test about car in free running at neutral position

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Embodiment Construction

[0058] On the basis of collecting a large number of vehicle technical parameters, through a large number of tests and empirical formulas that have been done, the intermediate value can be taken, and statistical calculations can be made for each series of the three types of cars, trucks and buses, and the average value of each series can be obtained. C value and average reference quality, draw a graph, calculate the regression curve equation, and determine the individual points that deviate greatly from the regression curve according to the model series. When the curb mass of the inspected vehicle is known, the curb mass plus 100kg is the benchmark mass. If there is no curb mass parameter of the inspected vehicle, the mass of the vehicle (including the driver’s mass) can be approximated as the benchmark mass. The value of constant C is calculated according to the regression curve equation of C and M, so that the quadratic equation between the equivalent drag coefficient of the r...

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Abstract

A method for counting out system resistance of vehicle free position running in road test and platform test sets up two curve equations of vehicle road test and platform test so system equivalent resistance coefficient and system resistance of vehicle at each speed point in road test can be obtained according to vehicle type and reference mass and furthermore equivalent inertia of free position chassis driving series on vehicle in platform test can be confirmed , thus system resistance at each speed point in platform test can be detected out by only utilizing once of free position running .

Description

technical field [0001] The invention relates to a statistical method for the resistance of a car's neutral coasting road test and bench test system, belonging to the technical field of car performance testing methods. Background technique [0002] At present, when testing the dynamic performance, exhaust emission performance, fuel economy performance, and coasting performance of the vehicle on the chassis dynamometer, it is necessary to determine the system resistance of the vehicle's neutral coasting road test and bench test at each speed point, so that In order to determine the loading load of the chassis dynamometer loading device under the specified working conditions of the automobile bench test simulation road test. The system resistance at each speed point of the vehicle's neutral coasting road test can be determined by the test method and the calculation method. The test method requires a lot of work, and the calculation method requires man...

Claims

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Application Information

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IPC IPC(8): G01M17/007
Inventor 吴明
Owner 吴明
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