Optimization And Matching For Heavy-duty Truck Powertrain

With the national economy growth and the development of transportation, energy have become increasingly conspicuous. Therefore, improving the productivity of transport of vehicles and reducing fuel consumption of vehicles is one of the important issues to be resolved in the automotive industry at present. With the ever-increasing of tenure quantity of vehicles in our country and wide range applications of heavy-duty truck, the automobile consumption of oil resources is increasing. The increase in demand for energy supply has been aggravated, so the users'requirements for vehicle performance, especially for fuel economy is also getting higher and higher. On the premise of ensuring vehicle dynamic performance, reducing vehicle fuel consumption rate so as to make vehicle meet more reasonable matching of vehicle dynamic performance and fuel economy has become one of focuses of the study in automotive field.This paper was proceeded connecting with the item"Matching and Optimization of Heavy-duty Truck Chassis System"which is a branch of"863"project presided by NVH group. To fuel economy as the goal, dynamic performance as constraint conditions, transmission ratio as the design variables, it carried out relevant studies for a certain commercial heavy truck powertrain matching.This paper introduced calculation methods of heavy-duty truck fuel economy and dynamic performance at first. Dynamic calculation includes the maximum speed, climb performance, and accelerate performance; fuel economy calculation includes fuel economy at constant speed and multi-condition fuel economy. Finally, the penman conducted correlate analysis on the driving cycle aiming at heavy-duty truck actual operating conditions.This paper uses ADVISOR software for the simulation platform, has established mathematical models of various assembly of vehicle powertrain. On this basis, it has developed a 6×4 multi-axis drive vehicle fuel economy and dynamic performance simulation module, and the module is embedded in the ADVISOR software, and then it has carried out fuel economy and dynamic performance simulation for 6×4 multi-axis drive heavy-duty truck by the use of the improved ADVISOR software, and it has compared simulation results with the corresponding sample-car test results, and has verified the effectiveness of developed multi-axis drive vehicle powertrain performance simulation module.This paper calculated and analyzed the matching curve of the final drive ratio and gear-box ratio by the use of proven software modules, and conducted matching of gear-box ratio and final drive ratio.This paper established the mathematical model of vehicle powertrain parameters optimization design, and the model is based on vehicle fuel economy as the objective function, dynamic performance as the constraint conditions, total transmission ratio of transmission system as the design variables. It carried out simulation for vehicle fuel economy in the six conditions provided by GB, and got multi-drive-cycle fuel consumption of 100 kilometers. On the basis, it optimized powertrain parameters of the studied vehicle, and the results show that the six conditions fuel consumption of 100 kilometers reduced by 6.59% on the conditions of maintaining dynamic performance of the original models, and achieved more satisfied optimization results.