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This paper presents detailed modeling of a novel electro-hydraulic variable valve actuator for internal combustion engines that is capable of continuously varying valve timing and dual-lift. First, nonlinear mathematical system model is developed component-by-component, considering electromagnetic, mechanical, and fluid dynamics, time delay and time-varying parameters. Second, in order to develop...
A control-oriented reaction-based combustion model is implemented and used to simulate the combustion process in a diesel engine. The model integrates a homogeneous thermodynamic system with a two-step chemical reaction mechanism that consists of six species. The accuracy of the model is evaluated by comparing with experimental data from a GM 6.6L, 8 cylinder Duramax engine. The model is calibrated...
In this paper, the problem of designing Robust Gain-Scheduling observers for continuous-time Linear Parameter-Varying systems via parameter-dependent Lyapunov function is addressed. The scheduling parameters are assumed to be imprecisely measured, i.e., corrupted with additive noise. Multi-simplex modeling approach is utilized to model the time-varying parameters and associated uncertainties. Sufficient...
This paper presents a new method to design Robust Switching State-Feedback Gain-Scheduling (RSSFGS) controllers for Linear Parameter Varying (LPV) systems with uncertain scheduling parameters. The domain of scheduling parameters are divided into several overlapped subregions to undergo hysteresis switching among a family of simultaneously designed LPV controllers over the corresponding subregion with...
Control-oriented models for Variable Geometry Turbochargers (VGT) typically calculate the turbine power based on isentropic assumptions with a fixed or a map based value for the turbocharger mechanical efficiency. While the fixed efficiency assumption is an obvious over simplification, the map based approach, on the other hand, may not be globally accurate due to the need for interpolation between...
Hybrid electrical vehicles (HEVs) are able to improve the fuel economy with reduced emissions due to their effective power management and regenerative power utilization. However, developing an optimal supervisory control strategy to distribute power is quite challenging due to the high degrees of freedom introduced by the multiple power sources in HEVs. Conventional approach uses so-called power follower...
Engine electronic throttle control (ETC) is challenging due to its high system nonlinearities and the required fast response time. In this paper, an electronic throttle system was modeled as a linear parameter varying (LPV) system in discrete-time domain, where the vehicle battery voltage is modeled as the measurable time-varying parameter; the nonlinear friction is modeled as a function of the measurable...
In this paper, a family of discrete-time system models of an Electric Variable Valve Timing (EVVT) actuator for internal combustion engines under different operational conditions were obtained through the closed-loop system identification, where the complicated EVVT actuating system was treated as a black box. Since it is almost impossible to hold the EVVT cam phasing system at the desired operational...
Engine electronic throttle control is challenging due to its high nonlinearities. In this paper, a discrete-time electronic throttle system was modeled as an LPV (linear parameter varying) system, where the vehicle battery voltage, the nonlinear friction, and spring are the measurable time-varying parameters. Gain-scheduling H2 controller was designed for the LPV throttle control system using the...
A two-zone control-oriented charge mixing model is developed to describe charge mixing with thermodynamic interaction between fresh charge and residual gas during the intake stroke. This work enables operating range of homogeneous charge compression ignition (HCCI) to be extended without loss of stability. Cylinder volume is divided into two zones with a fictitious divider. In the mixed zone, fresh...
The combustion mode transition between spark ignition (SI) and homogeneous charge compression ignition (HCCI) combustions of an internal combustion (IC) engine is challenging due to the distinct engine operating parameters over the two combustion modes and the cycle-to-cycle residue gas dynamics during the mode transition. The control problem becomes even more complicated for a multi-cylinder engine...
To make HCCI (Homogeneous Charge Compression Ignition) combustion feasible in a SI (Spark Ignition) engine, it is necessary to have the smooth mode transition between SI and HCCI combustions. The SI-HCCI hybrid combustion studied in this paper describes the combustion mode that starts with SI and ends with HCCI combustions. The main motivation of studying the hybrid combustion mode is that the percentage...
This paper models an electric variable valve timing (VVT) system and develops the corresponding controller for the electric VVT system. The studied electric VVT uses a planetary gear system for engine cam timing control; and a cyclic torque disturbance is applied to the cam shaft. The main motivation of utilizing the electric VVT system is for the mode transition control between the spark ignited...
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