Calibration method for measuring parasitic frictional resistance of electric dynamometer of chassis in gliding way
A technology of electric dynamometer and frictional resistance, which is applied in the direction of calibration/testing of force/torque/power measuring instruments, measuring devices, and testing of machine/structural components, etc. It can solve problems such as measurement result deviation and system loss, and achieve The effect of improving accuracy and reducing error
Inactive Publication Date: 2010-10-13
CHINA AUTOMOTIVE TECH & RES CENT
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Problems solved by technology
As a complex test system, due to the influence of many factors such as the friction of the motor bearing and the friction between the drum and the air, the test system itself has a certain system loss, which constitutes the parasitic friction resistance (parasitic friction) of the dynamometer system. result in some deviation
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[0019] The chassis electric dynamometer is used to test the driving force of the vehicle. The force directly measured by the load sensor of the dynamometer includes the driving force of the vehicle and the parasitic friction loss resistance of the dynamometer system itself. In order to obtain the actual value of the driving force of the vehicle, it is necessary to subtract the parasitic frictional resistance from the value directly measured by the dynamometer load sensor. Therefore, it is first necessary to calibrate the parasitic frictional resistance.
[0020] The parasitic frictional resistance of the chassis electric dynamometer is the loss of the system itself caused by many uncertain factors such as the bearing friction of the dynamometer motor and the friction between the drum and the air, and it changes with the change of speed. It is difficult to accurately express the relationship between drum speed and parasitic friction with mathematical expressions. In actual use,...
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The invention belongs to the technical field of the detection of automobiles, which relates to a calibration method for measuring the parasitic frictional resistance of an electric dynamometer of a chassis in a gliding way. The calibration method comprises the following steps of: calibrating the basic inertia BIM of the dynamometer; firstly, accelerating a rotating drum to a higher rotating speed exceeding the measurement speed range and then enabling the dynamometer to freely glide; when the speed of the rotating drum is lowered to the upper limit of the measurement speed range, starting timing and recording the gliding time of the rotating drum of the dynamometer in each speed interval; repeating measurement for many times, taking the interval of the average value t of the gliding time under each speed interval, which is obtained by the measurement of each time, and calculating the parasitic frictional resistance value under the speed interval; and fitting each set speed and the corresponding parasitic frictional resistance value into a curve by adopting a quadratic fitting method. The magnitude of the parasitic frictional resistance of the dynamometer can be measured by the invention, the parasitic frictional resistance of the dynamometer is calibrated, the accuracy of the dynamometer can be enhanced, and an error caused by the parasitic frictional resistance in the test of an automobile is decreased.
Description
technical field [0001] The invention belongs to the technical field of automobile detection, and relates to a method for calibrating parasitic frictional resistance of a chassis electric dynamometer. Background technique [0002] Chassis electric dynamometer (hereinafter referred to as dynamometer) is a special indoor vehicle testing equipment used in vehicle emission and durability tests, and can also be used in vehicle diagnosis and maintenance industries. It contacts the driving wheel of the vehicle under test through the drum to simulate the driving state of the car on the road. By loading the inertia and resistance on the drum, it can simulate the driving state of the car on the road, and at the same time collect the driving speed, acceleration, driving force, etc. parameter. After the exhaust gas analyzer is installed, the emission performance parameters of the vehicle under specific working conditions can also be obtained by combining the loading resistance of differ...
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IPC IPC(8): G01L25/00G01M1/10
Inventor 陈弘杨熹乔胜华万仁君温溢刘志新
Owner CHINA AUTOMOTIVE TECH & RES CENT