A device and method for simulating road surface adhesion coefficient of automobile brake system bench test
A technology of road surface adhesion coefficient and automobile braking system, which is applied in the field of bench test of automobile braking system
Active Publication Date: 2019-04-12
CHONGQING CAERI AUTOMOBILE TEST EQUIP DEV +1
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Problems solved by technology
According to the brake system test standard, it is necessary to complete the single road test, the butt joint road test, and the split road test. Only by accurately simulating various road surface adhesion coefficients on the rack can the brake system test be completed accurately
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[0031] The technical solutions in the embodiments of the present invention will be described clearly and in detail below with reference to the drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.
[0032] The technical scheme that the present invention solves the above-mentioned technical problem is,
[0033] refer to Figure 1-Figure 3 As shown, the vehicle braking system bench structure includes a drive motor, a flywheel set, a drum, 4 tires, 4 servo cylinders, 4 wheel speed sensors, a drum speed sensor, 4 servo cylinder load sensors, 4 brake force sensors, vehicle brake, brake pedal control mechanism.
[0034] The drive motor drives the drum to rotate to simulate the road surface; the servo cylinder controls the tires to press on the drum to simulate the contact between the four tires of the car and the ground; the brake pedal control mechanism includes the control of the pedal and the control s...
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The invention discloses a road adhesion coefficient simulation device and method for a bench test of an automobile braking system. The objective of the invention is to provide a road adhesion coefficient simulation method, and the method can be used for precisely simulating various different adhesion coefficients on the test bench. The method comprises the steps: calculating and obtaining the frictional force f0 withstood by a single wheel of an automobile according to a to-be-simulated road adhesion coefficient u0 and a to-be-simulated axle load N0 of the single wheel of the automobile; applying a load G0 to the single wheel of the automobile through a servo oil cylinder, enabling a rotating drum to rotate, gradually increasing the travel of a braking pedal till a tyre slips, collecting the maximum braking force Fmax, comparing the collected braking force Fmax with the calculated frictional force f0, and judging whether the difference between the maximum braking force Fmax and the calculated frictional force f0 is within a set small deviation range or not; Enabling the braking pedal to return to a zero position if the difference is bigger, changing the load applied by the servo oil cylinder, and increasing the position of the braking pedal from zero gradually; repeatedly carrying out the process till the collected difference between the maximum braking force Fmax and the calculated frictional force f0 is within the set small deviation range.
Description
technical field [0001] The invention relates to the field of bench tests of automobile braking systems, in particular to a method for simulating road surface adhesion coefficients of bench tests of automobile braking systems. Background technique [0002] Automobile braking system is an important device that enables a moving automobile to slow down or stop within a short distance and maintain a stable driving direction. Automobile brake failure is an important cause of highway accidents. The braking system test generally adopts the whole vehicle road test for testing. The whole vehicle road test is intuitive and real, and can comprehensively consider the influence of steering, suspension and other factors on the braking system. However, it cannot assess the distribution of the braking torque of each wheel, has poor repeatability, has high requirements for the test road, is greatly affected by the weather, is highly dangerous to the driver (such as a brake failure test), take...
Claims
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IPC IPC(8): G01M17/007
CPCG01M17/007
Inventor 黄菠唐家兵谌发坤廖洪王磊
Owner CHONGQING CAERI AUTOMOBILE TEST EQUIP DEV