A test method for braking energy recovery rate of pure electric vehicles

Abstract

The invention discloses a brake energy recovering rate test method for a battery electric vehicle. The method comprises the following steps that a sensor and a data collector are installed; brake condition of the test vehicle is tested in a rotary drum or standard test site, and a host computer reads measurement values of different sensors in real time via a data collector; the dissipation energyof a brake is calculated according to a main cylinder pressure signal and a wheel rotating speed signal; motor recovering energy is calculated according to the main cylinder pressure signal, pressuresignals of different wheel cylinders and the wheel rotating speed signal; and the brake energy recovering rate is calculated. The brake energy recovering rate is calculated according to main and wheelcylinder pressures, it is not required to additionally mount current and voltage sensors in a high voltage wire harness of the vehicle, the brake energy recovering rate can be calculated accurately via once test, operation is safe and simple, the test efficiency is high, and the method can be applied to rotary drum test as well as practical rod test.

Description

technical field [0001] The invention belongs to the technical field of braking energy recovery of pure electric vehicles, in particular to a method for testing the braking energy recovery rate of pure electric vehicles. Background technique [0002] In the context of the increasing shortage of non-renewable energy in the world, major manufacturers have introduced braking energy recovery technology in order to improve the driving range of pure electric vehicles and reduce energy consumption. Braking energy recovery is an important way to achieve energy saving and emission reduction for hybrid electric vehicles and pure electric vehicles. At present, the braking energy recovery technology mainly uses the braking energy recovery rate as the evaluation index. The convenient and accurate measurement of the braking energy recovery rate is very important for the development and evaluation of pure electric vehicles. However, the existing test methods cannot meet these needs. It is ...

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that current and voltage parameters are required to calculate the recovered braking energy, and the CAN message definitions of major vehicle manufacturers all adopt a confidentiality strategy, which makes it very inconvenient to obtain vehicle signals

Since the two tests cannot guarantee that the speed of the working condition, the state of the vehicle's power battery, the state of the motor, and the power consumption state of electronic appliances are completely consistent, and the energy recovery rate needs to be calculated through two tests, not only the calculation accuracy is poor, but the test is also difficult and inefficient.

Images