Abstract:Knowledge of the torque transmitted by each clutch is very important for improving the control performance of a dualclutch transmission system. However, it is not feasible to install sensors in the dual-clutch transmission for measuring the torque because of the limited space and high cost. This paper concentrates on estimating the torque transmitted by each clutch of a wet dual-clutch transmission without additional test sensors. The first part of the work covers the driveline model of the dual-clutch transmi… Show more
“…The driveline model of WDCT is shown in Figure 3, 20,21 and it has been described in the literature. 22 The WDCT with a double intermediate shaft has six forward speeds and a reverse speed. The odd gears on the solid shaft are connected to clutch 1 (CL1) and the even gears on the hollow shaft are connected to clutch 2 (CL2).…”
To reduce sliding friction work and clutch judder, an adaptive method of torque characteristic in dual clutch transmission during launch phase is presented in this paper. The proposed approach provides a tool to identify the change of torque characteristic and adapt it in real time. Firstly, to reduce the influence of the error between the nominal engine torque and the actual engine torque, the estimator based on the extended Kalman filter is designed to estimate the transmitted torque of the dual-clutch transmission during launch phase. Furthermore, the torque characteristic adaptive method is presented by a combination of the estimator with the improved Least Square Method. Then, based on the established driveline model of the dual-clutch transmission, the torque characteristic adaptive method during launch phase is validated by MATLAB/Simulink. Finally, in order to further evaluate the application potential of the adaptive method, the experiments are conducted on a production vehicle equipped with the wet dual-clutch transmission. The simulation and experiment results show that the proposed algorithms work well.
“…The driveline model of WDCT is shown in Figure 3, 20,21 and it has been described in the literature. 22 The WDCT with a double intermediate shaft has six forward speeds and a reverse speed. The odd gears on the solid shaft are connected to clutch 1 (CL1) and the even gears on the hollow shaft are connected to clutch 2 (CL2).…”
To reduce sliding friction work and clutch judder, an adaptive method of torque characteristic in dual clutch transmission during launch phase is presented in this paper. The proposed approach provides a tool to identify the change of torque characteristic and adapt it in real time. Firstly, to reduce the influence of the error between the nominal engine torque and the actual engine torque, the estimator based on the extended Kalman filter is designed to estimate the transmitted torque of the dual-clutch transmission during launch phase. Furthermore, the torque characteristic adaptive method is presented by a combination of the estimator with the improved Least Square Method. Then, based on the established driveline model of the dual-clutch transmission, the torque characteristic adaptive method during launch phase is validated by MATLAB/Simulink. Finally, in order to further evaluate the application potential of the adaptive method, the experiments are conducted on a production vehicle equipped with the wet dual-clutch transmission. The simulation and experiment results show that the proposed algorithms work well.
“…As mentioned earlier, real torque signals acquired from the drive shaft play an essential role in the control framework, torque transducers are hardly mounted in mass-production vehicles. 27 Therefore, an EKF is adopted for the estimation of the torque information in real operating conditions. The EKF estimator and the controllers both receive signals of the speed and the nominal engine torque, the former being responsible for the output of the estimated drive shaft torques and the latter creating the clutch torque demands as the input in the control.…”
Section: Controller For the Power On Downshiftmentioning
confidence: 99%
“…As mentioned earlier, real torque signals acquired from the drive shaft play an essential role in the control framework, torque transducers are hardly mounted in mass-production vehicles. 27 Therefore, an EKF is adopted for the estimation of the torque information in real operating conditions. Figure 10.Block diagram of the micro-slip controller time.EKF: extended Kalman filter.…”
Micro-slip control of multi-disc clutches is effective for attenuation of vibration and smooth gearshifts in dual clutch transmission. This paper proposes a method to apply micro-slips on the clutches for gearshift process, which differs from the conventional lockup control. The vehicle powertrain is modelled as a six degrees of freedom dynamic system, including a hydraulic actuator model. Micro-slips of dual clutches are realised by a closed-loop feedback controller according to the control-oriented model. The controller is used to evaluate demands of the clutch torques and transform them to input currents for the hydraulic solenoid valves. Numerical analysis and experiment are preformed, and the results show that the effect of clutch micro-slips is significant in improving the shift smoothness and the drive comfort of the dual clutch transmission during gearshifts.
“…Therefore, for design of the controller, an effective extended Kalman filter (EKF) is employed to estimate the half shaft torque and the wheel speed considering nonlinearities of the driveline. 28 The optimal controller is developed according to estimations of the traction motor speed, wheel speed, and half shaft torque, as shown in Figure 14. Meanwhile, a feed-forward controller is added to follow the driver’s intention, related to opening of the acceleration pedal and speed of the drive motor.…”
Public interest in pure electric vehicles equipped with two-speed automatic mechanical transmission is increasing because of not only widened high-efficiency operation zone but also reduced speed range and cost of electric drive system. In this paper, transient dynamic behaviors of an e-drive passenger car including clutch-free two-speed automatic mechanical transmission are analyzed during up and down shifts. Bench tests for the proposed electric driveline are conducted, by which the dynamic model and the shift control strategy are validated. In experiments, severe jerking phenomena are observed when the drive motor torque sharply decreases before the separation with current gear meanwhile fast increases after the engagement with target one. For alleviation of the torsional shocks, feed-forward control in combination with optimal torque feedback control is developed for the drive motor according to torque estimation of the half shaft using extended Kalman filtering method. Meanwhile, a sliding mode control is employed for precise positioning of the shift fork for the transmission. By comparisons of the simulation and test results, it is demonstrated that the proposed control strategy reduces the jerking intensity of driveline as well as the shift period effectively in shift process.
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