Research on energy recovery strategy in breaking of electric tractor-semitrailer

Tractor-semitrailer play an important role in the transportation industry. However, global warming and the rapid development of energy technology have promoted the transformation and upgrading of the large-emission transport vehicles, such as tractor-semitrailer, to be powered by new energy, in order to realize the goal of energy conservation, emission reduction and cost reduction. With the motor as the driving source, the remaining energy during braking or coasting can be converted into electricity and stored in the battery for later use. In order to study the braking energy recovery of electric tractor-semitrailer, tire models, brake models and motor models were established based on the turning braking conditions of electric tractor-semitrailer. Considering the load transfer phenomenon during braking, an 8-DOF nonlinear vehicle dynamics model was proposed. Then, the principle of vehicle braking energy recovery is studied, and combined with the vehicle dynamics model, the braking force distribution strategy based on the optimal energy recovery is explored. Then, this paper investigates the braking energy recovery strategy optimization based on lateral stability for the jackknife phenomenon of high-speed turning braking. The comparison and analysis of the results before and after optimization show that the optimization strategy can simultaneously achieve the balance between the optimal energy recovery and the lateral stability.