Design Of Distributed Hybrid Drive System For Heavy Duty Truck

Heavy-duty trucks are an important form of transporting large-scale equipment,bridge profiles,military equipment and other materials by road.It has two kinds of power: diesel engine and new energy.Diesel heavy-duty trucks are inefficient and wear-and-tear.The existing new energy heavy-duty trucks can improve the driving force to a certain extent,but they can not meet the huge driving force requirements of heavy-duty trucks,nor can they meet the requirements of multi-axle drive or full-drive of heavy-duty trucks.The distributed hybrid electric drive system designed in this paper can not only realize multi-axle drive,provide super driving force for heavy transport vehicles,but also greatly improve the performance of heavy transport vehicles.At present,the driving technology of heavy-duty trucks has been studied,but the effect is very little.Therefore,the design and research of distributed hybrid drive system will have very important theoretical significance and practical value for improving the load capacity and performance of heavy-duty transport vehicles and improving transportation efficiency.In order to meet the requirements of super-high power driving force and high performance of heavy haul trucks,a new type of distributed hybrid electric drive system is proposed.The design calculation and analysis of the system are carried out by combining theoretical calculation with software simulation.Firstly,in order to meet the requirement of super heavy-duty capacity and high performance of heavy-duty trucks,a new distributed hybrid drive system for heavy-duty trucks is designed based on the existing new energy technology.Secondly,the original diesel engine drive system of a semi-trailer tractor is transformed into a distributed hybrid drive system.The parameters of the improved drive system are designed,and the performance and load capacity of the modified vehicle are calculated theoretically.Thirdly,based on the analysis of the characteristics of the commonly used control strategies of hybrid power system,the logical threshold control strategy based on torque is selected.According to the characteristics of the working mode of the distributed hybrid drive system,the target values of the torque allocation under different modes are designed,and the control strategy model is built by using Simulink module of MATLAB software.Finally,the model of the retrofitted heavy-duty truck is built in CRUISE software,and the built control strategy is imported to simulate and verify the improvement of vehicle performance and load capacity respectively.The results show that,in terms of performance improvement,the maximum speed and maximum climbing gradient of themodified vehicle are 51.8% and 70% higher than before,while the acceleration time of0-30 km/h and the comprehensive fuel consumption of 100 km are reduced by 34.2% and17.8%,respectively.In terms of load capacity improvement,the load capacity of the modified vehicle is 70% higher than that of the original vehicle on the premise of basically maintaining its original performance.The results show that the distributed hybrid electric drive system can improve the load capacity and performance of heavy-duty trucks,and can meet the needs of high performance and heavy-duty development of heavy-duty trucks.