Abstract:The traditional filling control strategy mainly relies on a large number of calibrations and is an open loop control. In order to avoid cumbersome calibrations and improve the control precision, a systematic approach of the filling control for wet dual clutch transmission is established in this paper. First, a model of the electro-hydraulic actuator for the wet dual clutch transmissions is presented and validated by the experiments. Then, an analytic solution method is developed for the filling control. To obt… Show more
“…Then, the hydraulic oil flows into the valve chamber from the mainline, produced a pressure P v in valve chamber, and further flows into the piston chamber, produced a pressure P p . The detailed description was presented by Hao 25 as well. Figure 4.The hydraulic actuator system for the dual clutches.…”
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.
“…Then, the hydraulic oil flows into the valve chamber from the mainline, produced a pressure P v in valve chamber, and further flows into the piston chamber, produced a pressure P p . The detailed description was presented by Hao 25 as well. Figure 4.The hydraulic actuator system for the dual clutches.…”
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.
“…While the spool exceeds a neutral position under the action of F mag , the exhaust port is closed and the supply port is open, the hydraulic oil flows into the valve chamber from the mainline, it produces a pressure P v in the valve chamber and further flows into the piston chamber and finally produces a pressure P p . The detail is presented in Balau and colleagues 14–16 and Hao et al 17…”
This article proposed a nonlinear robust controller to achieve vehicle creep for dual-clutch transmission. The control problem is summarized as the tracking control, and linear quadratic approach is adopted to define the trajectory of the clutch slip before the controller design. The control scheme is derived from an error affine nonlinear system; meanwhile, by combining nonlinear H∞ method with the backstepping technique, the nonlinear controller is programmed to achieve the tracking of the clutch slip trajectory against the model uncertainties or disturbance. The designed controller is evaluated by simulation model including the dynamic powertrain and hydraulic actuator model, and the results show that the nonlinear controller is effective in clutch slip tracking control and has better control performance than that of the proportional–integral–derivative in terms of disturbance attenuation.
“…The valve model consists of the mechanics and fluid dynamics, including the spool and piston motion, the flow variation in chambers, and the compressibility of the hydraulic fluid; it is described in detail as presented in the literature. [19][20][21] Before the clutch engagement, the transmission control unit implements an open-loop control for the clutch prefill to eliminate the clearance between the clutch plates. Once the clutch prefill is completed, the hydraulic dominant dynamics can be approximated by a first-order model for controller design given by…”
Clutch micro-slip is significant in improving the performance of dual clutch transmission. Unlike with the conventional lockup control strategy, this research designs a novel controller to enable a desired micro-slip on clutch at the end of clutch engagement. Prior to the design, an extended Kalman filter is proposed to estimate the drive shaft torque based on an estimation model. The controller design is using the pole placement method based on the clutch slip dynamics; its input is calculated according to the estimated drive shaft torque, the engine torque, and the error between the actual slip and desired micro-slip, which realizes a closed-loop feedback control to ensure the control performance. The controller is validated by simulation works, and the results show that the clutch micro-slip is stable and robust.
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