Study On The Dual Clutch Transmission Based On Integrated Powertrain Control

With the development of electronic technology, as well as the driver’s requirements fordriveability, comfort, safety and convenience, the automatic transmission has been anincreasingly wide range of applications, because of it has a series of advantages includingits reduction of fuel consumption, improvement of emissions and the driver’s convenience.Along with the development of science and technology, the automatic transmissionproduct experienced continuous improvement, evolution and upgrade. With the Applicationof the theory of automatic transmission and electronic control technology, the vehicle’slaunch and shift base on the integrated powertrain control technology is automaticallycompleted by control the output torque of engine and the clutch’s work state through theactuator. The Integrated powertrain control system provides optimum power through the useof an electronically controlled throttle and adjustment of shift position. The system offers ashockless shift by increasing or decreasing engine torque when shifting and improves fueleconomy.As the research focus of domestic and international transmission industry, Dual clutchtransmission is evolved in parallel shaft transmission, which arranged tow clutch parallellyon the odd gears and the even gears. The shift progress of the dual clutch transmission iscompleted by clutch to clutch shifting. It maintained advantages of a traditional manualtransmission including the simple structure and high efficiency, but also achieves powershift without interruption, which has improved the vehicle’s driveability and economy.Research on dual clutch transmission based on the integrated powertrain control theoryis developed in this paper. The key technical issues of dual clutch transmission based onintegrated powertrain control is studied through depth theoretical analysis and experimentalresearch. On the basis of analysis on the structural characteristics of the dual clutchtransmission and its application status, as the following study of‘863’ high-tech programproject(No.2006AA110109)‘the development of six-speed dual clutch transmission’, Thedual clutch transmission control technology based on the integrated powertrain is studied,.The main content of research is as follows: 1. Vehicle system model is built used in DCT’s simulation using modular modelingtechnology according to the characteristics of model based design. The entire system modelis divided into three parts: the driver model, controller model and the vehicle hardwaresystem model using the MATLAB/Simdriveline. The model of the entire powertrainequipped with dual clutch transmission is established by analyzing vehicle hardware. It canbe seen from the comparison of simulation and experimental results that the simulationresults from the two aspects of the dynamic characteristics and fuel economy characteristicscan effectively reflect the operation of the vehicle, which proves the validity of thesimulation model. The simulation model could be the foundation to develop the controlstrategies of the dual clutch transmission based on integrated powertrain.2. Engine torque control system is designed, using fuzzy compensation control toachieve precise control of engine torque. The hardware and software of the electronicthrottle control system is designed, using fuzzy parameter self-tuning PID control method toachieve a good electronic throttle control. The electronic throttle control system is tested.The experimental results show that the throttle follows well, which proves the effectivenessof the control method.3. The dual clutch transmission shift schedule based on integrated powertrain isdeveloped using dynamic programming method on the basis of analyzing traditional shiftschedule. The simulation comparison is obtained, which including the traditional shiftschedule and integrated powertrain shift schedule under the ECE driving cycle simulation,EUDC driving cycle simulation and full-throttle acceleration performance. It can be seenfrom the comparison that the integrated powertrain shift schedule can improve fueleconomy without losing driveability.4. The DCT’s shift quality control strategy based on integrated powertrain is proposedon the basis of analyzing the shift quality evaluation. The output torque keeps stable beforeand after shift through the integrated control of the engine torque and the torque of the dualclutch. Precise control of the clutch pressure is achieved by using Radial Basis FunctionNeural Network to build the intelligent pressure control system, which is simulated. Thesimulation results show that the intelligent clutch pressure control system achieved theprecise control of the clutch pressure which can effectively guarantee the actual pressure tofollow the target pressure and reduce the pressure control error. The gearshift qualitysimulation is analyzed, which shows that the shift quality control strategy proposed in this paper can improve the shift quality.5. The electric control system of the integrated powertrain is designed. ThePCU(Powertrain control units) hardware system is designed by using XC164CSmicrocontroller. The software architecture is proposed based on the integrated powertraincontrol. The hardware and software of the DCT based on integrated powertrain is developed.The data acquisition systems theory and analysis equipment is introduced. The real vehicletest is carried out, which verifies the validity of the control strategy proposed in this paper.In this paper, the key technologies of dual clutch transmission based on integratedpowertrain is studied by combining the theoretical analysis and experiment. The test andsimulation results show that the performance of the driveline is effectively improved by theuse of integrated powertrain control technology, which has some reference value for thedevelopment of the dual clutch transmission.