Test method for regenerative braking force in electric vehicles

摘要

In an electric vehicle having front wheels braked by regenerative braking and hydraulic braking and rear wheels hydraulically braked, it is possible to check the magnitude of the regenerative braking force easily and accurately, by using a two-axle chassis dynamometer. Assuming that the front wheel braking force F2' detected by the chassis dynamometer is the total braking force C2' of the front and rear wheels, the total braking force C2' is broken down into component forces according to braking force distribution ratio data previously stored in a memory, to calculate a reference regenerative braking force A2'D2'. Based on the actually detected pedal depressing force A2 and the distribution ratio data, an imaginary pedal depressing force A2' is calculated that is required to produce a total braking force of the driven wheels and follower wheels equal to the braking force F2', generated by the driven wheels in the actual pedal depressing force A2. Based on the imaginary pedal depressing force A2' and the distribution ratio data, the imaginary regenerative braking force A2'D2' that is produced by the driven wheels in the imaginary pedal depressing force A2', is calculated and then compared with the reference regenerative braking force A2'D2'.