To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetra...To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable.展开更多
In parallel hybrid electrical vehicle （PHEV） equipped with automatic mechanical transmission （AMT）, the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gears...In parallel hybrid electrical vehicle （PHEV） equipped with automatic mechanical transmission （AMT）, the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.展开更多
The progress of safety technologies,based on the continuous advances in vehicle crash worthiness,restraint systems and active safety functions made traffic safer than ever before.Latest developments heading from assis...The progress of safety technologies,based on the continuous advances in vehicle crash worthiness,restraint systems and active safety functions made traffic safer than ever before.Latest developments heading from assisted Advanced Driver Assistance System(ADAS)to Automated Driving(AD),lead to more and more complex real-world situations to be handled,going from standard driving tasks up to critical situations,which may cause a collision.Therefore,throughout the development process of such systems,it becomes common to use simulation technologies in order to assess these systems in advance.To gain results out of the simulation,input data are required;typically,from various sources,so the requirements can be covered.Thus,the challenge of scoping with different input sources arises.To come along with that problem,two main kinds of input data will be needed in general:(1)the descriptive parameter covering all border conditions,so called parameter room;(2)the system specifications for estimation.The quality of the results correlates strongly with the quality of inputs given.In case of ADAS systems and AD functions,the second kind of input data is very well known.Major challenges relate to the first kind of input data.Thus,the paper will describe a way to create input data that cover all descriptive parameters needed from normal driving up to the collision by the combination of accident analysis and real-world road traffic observations.The method aims at being applicable to different data sources and to different countries.展开更多
文摘To improve ground vehicle efficiency, shift schedule energy saving was proposed for the ground vehicle automatic transmission by studying the function of the torque converter and transmission in the vehicular drivetrain. The shift schedule can keep the torque converter working in the high efficiency range under all the working conditions except in the low efficiency range on the left when the transmission worked at the lowest shift, and in the low efficiency range on the right when the transmission worked at the highest shift. The shift quality key factors were analysed. The automatic trans-mission's bench-test adopting this shift schedule was made on the automatic transmission's test-bed. The experimental results showed that the shift schedule was correct and that the shift quality was controllable.
基金This project is supported by National Hi-tech Research and Development Program of China (863 Program, No. 2001AA501200, 2003AA501200).
文摘In parallel hybrid electrical vehicle （PHEV） equipped with automatic mechanical transmission （AMT）, the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.
文摘The progress of safety technologies,based on the continuous advances in vehicle crash worthiness,restraint systems and active safety functions made traffic safer than ever before.Latest developments heading from assisted Advanced Driver Assistance System(ADAS)to Automated Driving(AD),lead to more and more complex real-world situations to be handled,going from standard driving tasks up to critical situations,which may cause a collision.Therefore,throughout the development process of such systems,it becomes common to use simulation technologies in order to assess these systems in advance.To gain results out of the simulation,input data are required;typically,from various sources,so the requirements can be covered.Thus,the challenge of scoping with different input sources arises.To come along with that problem,two main kinds of input data will be needed in general:(1)the descriptive parameter covering all border conditions,so called parameter room;(2)the system specifications for estimation.The quality of the results correlates strongly with the quality of inputs given.In case of ADAS systems and AD functions,the second kind of input data is very well known.Major challenges relate to the first kind of input data.Thus,the paper will describe a way to create input data that cover all descriptive parameters needed from normal driving up to the collision by the combination of accident analysis and real-world road traffic observations.The method aims at being applicable to different data sources and to different countries.
