The article presents a comparison of methods for measuring vehicle braking deceleration during road tests, taking into account the requirements for the periodic assessment of the vehicle’s braking system performance. The results of measurements performed with various types of instruments used in such tests are discussed. Inertial instruments approved for use in vehicle inspection stations, an optical device, and two sets of multi-axis acceleration sensors were compared. Discrepancies in results between individual measurement methods were evaluated.
The safety of using a motor vehicle is fundamentally dependent on the effectiveness of the braking system. Therefore, much attention is paid to the modernization and development of this system during the design phase, as well as its assessment during vehicle operation. For this purpose, various methods of measuring braking forces are used in both static and dynamic conditions. The accuracy of the measurements is crucial for the decision to allow a vehicle to be driven on public roads. All types of assessments of the braking system’s efficiency require specialized equipment.
In road tests of motor vehicles, accelerometric instruments that use the principle of a moving mass acting on a force sensor—thereby allowing the determination of the deceleration value acting on that mass—are widely used, as are devices that allow for the measurement of the distance traveled by the vehicle or its speed. The former are primarily used in diagnostic practice, in road-based vehicle inspection tests, where the most commonly adopted methodology for assessing the condition of mechanical and hydraulic braking system components is based on measurements of braking deceleration [1,2].
Such a necessity to perform measurements on the road arises, for example, in the situation of assessing a vehicle whose axle loads are greater than the permissible load on the rollers of a roller brake tester. According to current regulations, measurements in such cases are performed on the road. (…)
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Source: Logistyka Magazine
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