Indirect measurement technology of new energy vehicles’ braking force under dynamic braking conditions
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Currently, direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles. Thus, in this paper, an indirect measurement method of new-energy vehicles’ braking force under dynamic braking conditions is proposed. The mechanical wheel and axle model at low/idling/high speeds is established using the piston-pressure formula, force transfer in the brake-wheel cylinder, relative movement between the wheel and the roller, among others. On this basis, the relationship between wheel braking force and roller-linear acceleration is further derived. Our method does not alter existing vehicle structures or sensor types. The standard sealing bolt is temporarily replaced with a hydraulic sensor for coefficient calibration. Afterward, the braking force can be indirectly calculated using the roller-linear velocity data. The method has characteristics of efficiency and high accuracy without refitting vehicles.
KeywordsBraking force Indirect measurement technology Vehicles Dynamic braking condition Electromagnetic interference (EMI) test
This research is supported by the Guangzhou Science and Technology Project (Grant No. 201504010037). We thank the useful discussion with engineers of AVL List GmbH and their support, as well as the discussion with some experts of CISPR and Chinese National Technical Committee of Auto Standardization. The hydraulic sensor is supplied by Guangzhou Huamao sensing instrument Co. Ltd.
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