Mode Transition Control Using Disturbance Compensation for a Parallel Hybrid Electric Vehicle

Abstract

This paper proposes a new approach for the mode transition control in a parallel hybrid electric vehicle (HEV) with an engine clutch. During mode transition, a noticeable jerk or torque fluctuation in the hybrid powertrain, which may result in the vibration of the drivetrain and an unpleasant driving sensation, occurs frequently because of discontinuity of the dynamics and the characteristics of the powertrain system. Therefore, ensuring smooth vehicle operation during the mode transitions is an important objective of the HEV control. This paper presents a four-phase control strategy during transition from the electric vehicle mode to the hybrid mode by using disturbance observers. The disturbance observer estimates and compensates for disturbances to improve control accuracy, tracking performance, and drivability. The vehicle model is developed to represent the characteristics of the transient response of the target system and is used to simulate and verify the proposed control algorithms. The simulation results show the validity of the proposed control algorithms.

Drivability-Related Discrete-Time Model Predictive Control of Mode Transition in Pre-Transmission Parallel Hybrid Powertrains

“…Energies 2016, 9, 740 3 of 31 strategy to alleviate the torque oscillation during the inertia phase in a CPPHP [14]. Chen et al introduced an output feedback control based torque coordination controller to achieve a smooth clutch engagement at the ending of the inertia phase in the clutch-based pre-transmission series-parallel hybrid powertrain [15].…”

“…Koprubasi et al proposed an output feedback control based asymptotic stable controller to smooth the clutch engagement in the CPPHP [13]. Kim et al presented a disturbance compensation based torque coordination control strategy to alleviate the torque oscillation during the inertia phase in a CPPHP [14]. Chen et al introduced an output feedback control based torque coordination controller to achieve a smooth clutch engagement at the ending of the inertia phase in the clutch-based pre-transmission series- Conventionally, vehicle manufacturers define drivability as the driver's subjective perception of the vehicle's powertrain operation.…”

A Control Strategy for Mode Transition with Gear Shifting in a Plug-In Hybrid Electric Vehicle

“…Some researchers proposed that engine torque error and clutch friction torque are compensated for by using the torques of integrated starter and generator (ISG) and the electric motor [9]. Other researchers suggested having the HEV system without ISG by controlling the tractive motor for synchronization of clutch speeds, while it sustained low driveshaft acceleration [10].…”

Coordinated control strategies for a full hybrid electric vehicle with single motor during mode changes

“…And another problem of similar nature has been discussed using fuzzy adaptive sliding mode approach for a series-parallel hybrid electric bus (Wang et al, 2012). A new approach based on disturbance compensation control has been proposed to improve drivability issues of a parallel hybrid vehicle during mode transition (Kim et al, 2010). And a control method based on switched hybrid system theory has been utilised to achieve a seamless transition between electric launch and hybrid driving mode for a parallel hybrid vehicle (Koprubasi et al, 2007;Zhao et al, 2011).…”