The ever-growing complexity of engine and powertrain systems integration requires new control model. Torquebased 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 development is described. This paper considers a mean-value engine model, it incorporates throttle inlet, intake manifold intake, cylinder inlet, engine rotation dynamics and vehicle dynamics with mean-value type of fidelity that is good for control system design.
This paper proposes a delay-dependent guaranteed cost control scheme for engine idle speed control (ISC) with induction-to-torque delay and external load disturbance. An augmented linearization model of engine at idle speed operating mode was developed based on physical principle and experiment data. To provide a compromise between disturbance rejection and other performance requirements of ISC, a multi-objective cost function upper bound was given, which can help us to take into account the fuel economy and disturbance rejection performance together in ISC. Poles constraint was added to the closed-loop system to guarantee convergence rates of state. The whole optimization solution to ISC can be solved under the framework of LMI. A commercial engine model was utilized to assess the performance of the controller. Simulation results on this model show us that designed controller can achieve desired performance.
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