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23-11-2019 | Issue 4/2019

Advances in Manufacturing 4/2019

Indirect measurement technology of new energy vehicles’ braking force under dynamic braking conditions

Journal:
Advances in Manufacturing > Issue 4/2019
Authors:
Sen-Ming Zhong, Gui-Xiong Liu, Jia-Jian Wu, Bo Zeng

Abstract

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.

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