Investigation of mode transition coordination for power-split hybrid vehicles using dynamic surface control

Abstract

For passenger cars propelled by the dedicated compound power-split hybrid powertrain, driveline oscillations-induced vehicle jerks are often excited during clutch-to-clutch shift operations while drive mode changes. To tackle this issue, a coordinated dynamic surface control is developed by integrating clutch slips and motor torque compensation strategies through trajectories tracking of both clutch slip speed and wheel speed. Uncertainties or disturbances are treated to be additional inputs of the system, and model nonlinearities are considered and implemented in discretized form through lookup tables. A complex simulation model including electro-hydraulic system is proposed and validated via experiments. The coordinated controller is validated by collaborative simulation. Numerical examples are made and simulation results verify that the controller is effective and robust enough against parameters uncertainties.

Efficient Mode Transition Control for DM-PHEV With Mechanical Hysteresis Based on Piecewise Affine H ∞ Strategy

“…To simulate the dynamic characteristics of the wet clutch, an electro-hydraulic system from proportional valve current to clutch friction torque is established. Here the model of electro-hydraulic system is built according to [7]. Based on the AMESim model of wet clutch, the step response of wet clutch is simulated as shown in Fig.…”

“…Zhou et al proposed a linear quadratic regulator (LQR) coordinated controller considering both the vehicle jerk and clutch slipping energy loss to smoothly engage the clutch [6]. Xu et al developed a coordinated dynamic surface control which considered uncertainties or disturbances of the system for the MTP of a power-split hybrid powertrain, and the vehicle jerk can be suppressed within 10m/s 3 with observer error of clutch oil pressure [7]. Besides the usual performance index, Wang et al proposed an optimal oil-pressure curve which was optimized through considering the rotational displacement-based varying mesh stiffness (RDMS) of gear teeth and building a nonlinear transient torsional vibration (TTV) model of planetary hybrid power-split system (PHPS), both the TTV and ride comfort is enhanced through the oil-pressure optimization [8].…”

Review on multi‐power sources dynamic coordinated control of hybrid electric vehicle during driving mode transition process

“…Wang et al 67 compensated for engine output torque ripple and torque estimation error by the active damping torque of motor consisting of the estimated torque of the planet carrier and the speed tracking of the output shaft. Xu et al 68 studied the sliding phase of the wet clutch in the power coupling device during the two hybrid driving mode switching processes, and extracted the clutch speed difference, oil pressure and vehicle speed as the state variables. By designing the ideal tracking trajectory of the above state variables, the corresponding error state-space model was established.…”

“…It could be summarized that the robust controller shows good robustness and obvious effectiveness for different acceleration conditions and parameter perturbations. Considering the oil pressure detection error of the clutch chamber, the change of the system parameters, for example, the road gradient and vehicle mass, Xu et al 68 simulated the mode switching process with the sinusoidal oil pressure error detection signal and the vehicle full load running at 5 gradient. The results demonstrated that the DCCS has good robustness for the above disturbances and parameter disturbances.…”

Mode Transition Control of a Power-Split Hybrid Electric Vehicle Based on Improved Extended State Observer

“…Chiang et al [18] conducted multiple stability verification tests of fuzzy sliding mode controller with different qualities and different friction coefficients. Xu et al [19] demonstrated that the proposed coordinated controller has good robustness with the sinusoidal oil pressure error detection signal and the vehicle full load running at 5 • gradient. It is worth noting that most of the above studies have taken the HEV mode switching response under non-interference conditions as the entry point to design a coordinated controller, which leads to relatively one-sided and low practical value research conclusions.…”