Research on Regenerative Braking Control Strategy of Commercial Vehicles Considering Battery Power Status

Regenerative braking is an effective way to increase the cruising range of vehicles. In commercial vehicles with large vehicle mass, regenerative braking can be maintained in a high-power working state for a long time theoretically because of the large braking torque and long braking time. But in fact, it is often impossible to run at full power because of battery safety problems. In this paper, a control strategy is designed to maintain the maximum power operation of regenerative braking as much as possible. The maximum charging power of the battery is obtained through the battery model, and it is set as the battery limiting parameter. The regenerative braking torque and power are obtained by using the motor model. The eddy current retarder is used to absorb the excess power that the battery can't bear, and the braking torque of the eddy current retarder is calculated. Finally, mechanical braking is used to make up the insufficient braking torque. A set of algorithms is designed based on the brake pedal opening balance of three braking modes. On the premise of ensuring battery safety, try to increase the priority of regenerative braking and reduce the use of mechanical braking. MATLAB is used to simulate the long downhill process of commercial vehicles at the toe of constant slope. Compared with the traditional regenerative braking method, the mechanical braking temperature in this work decreased by 37.62% on average. This work reduces the mechanical braking pressure, reduces the risk of overheating of commercial vehicle brakes, and improves the and safety of the whole vehicle.