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A new nonlinear Quantitative Feedback Theory (QFT) methodology is presented and applied to the control of the automotive driveline with nonlinear clutch and backlash. A driveline model is presented which incorporates the nonlinear clutch characteristics and the coupling backlash realistically sandwiched by compliant inertias. The model gives responses that are representative of typical driveline systems,...
Ideal running performance requires that series-parallel hybrid electric vehicles smoothly transite between series and parallel operation modes. Clutches are widely applied to series-parallel hybrid electric vehicles to connect or disconnect powertrain components. Due to discontinuous nonlinear effect of clutch friction characteristics, smooth transition with little frictional dissipation is difficultly...
To improve the shift quality of vehicle with clutch-to-clutch gear shifts, a nonlinear controller based on flatness is proposed for the clutch slip control during the inertia phase. A nonlinear feedforward control is designed in consideration of the system nonlinearities, and a linear feedback control is given to accommodate the model errors and the disturbances. The proposed control scheme has small...
This paper deals with a hierarchical architecture of the Engine Control Unit (ECU) made-up of two levels: the higher one, called powertrain level, computes the current and the future torque demands; The lower level, called engine level, uses these information to provide an appropriate motor control. In continuous-time framework, a H2-control design with preview is proposed for the lower level and...
Hybrid vehicle fuel economy and drivability performance are very sensitive to the ldquoenergy managementrdquo controller that regulates power flow among the various energy sources and sinks. Many methods have been proposed for designing such controllers. Most analytical studies evaluate closed-loop performance on government test cycles. Moreover, there are few results that compare stochastic optimal...
In order to complete the function, performance test and the acceptance of AMT electric control system used for a vehicle, combined with the operation principle of AMT system, the dynamic performance detection test bench for AMT electric control system powered by AC asynchronous motor, was designed. The subsystem composed of AC asynchronous motor and motor controller was designed to simulate electronic...
According to the design requirements, the powertrain dynamic simulation model of an integrated starter/generator (ISG) hybrid electric vehicle (HEV) was established using Simulink. The parallel electric assist control strategy (PEACS) was researched and designed in this paper. The analysis of dynamics performance and fuel economy of the model was carried out under the FTP drive cycle, which can provide...
This is the second part of the two-part paper to illustrate the control system design and multi-energy strategy, it is the key to fulfill the fuel economy target for ISG hybrid bus. Based on a hierarchical structure, the control system is developed with the HCU (hybrid control unit) as the central controller to coordinate the motor, engine and CAN communication protocol. The multi-energy control strategy...
The ever-growing complexity of engine and powertrain systems integration requires new control model. Torque-based control model enables flexibility and expanding ability of the engine and powertrain control system structure. This paper describes a torque-based engine and powertrain model. Based on the the physical principle and experiments data, an engine and powertrain model for control strategy...
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