Chia-Jui Chiang

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—This paper presents a model-based nonlinear feedback controller designed to regulate the crank angle at 50% fuel burned (50) for a gasoline homogeneous charge compression ignition engine model during load transitions. The regulation of the combustion timing is based on manipulating the charge temperature through internal dilution, which is achieved by(More)
—This paper analyzes the stability of the autoignition process of homogeneous charge compression ignition (HCCI) engines with exhaust dilution. We find conditions under which steady-state multiplicity exists with stable and unstable equilibria. This analysis is conducted taking into account the internal feedback structure of the thermal dynamics.(More)
Homogeneous Charge Compression Ignition (HCCI) engines provide a possible solution for affordable, efficient and clean-burning power sources for either stationary power generator or advanced vehicles. In fact, HCCI engines integrate the advantages of both the spark ignition (SI) and compression ignition (CI) engines: (i) high fuel efficiency resulting from(More)
The urea-water-solution based selective catalyst reduction(SCR) system is one of the effective device to reduce the NO<inf>x</inf> emission of diesel engines. In order to realize the SCR technology in automotive application, a model-based approach is used for controller design in this paper. NO<inf>x</inf> emission must be regulated while NH<inf>3</inf>(More)
The purpose of this paper is to establish a dynamic ultracapacitor model which consists of an equivalent circuit model with voltage and temperature effects on its parameters and a thermal model. Identification of parameters in the equivalent circuit model is conducted by alternative current impedance spectroscopy (ACIS) experiment, which uses the least(More)
For the purpose of model-based analysis and control design, a dynamic physics-based model for free-piston engine generator is developed in this paper. The physics-based model contains 16 states, which include piston dynamics, port and cylinder gas filling dynamics and thermal dynamics. Homogeneous charge compression ignition (HCCI) combustion is employed(More)
In this paper, simultaneous estimation of state-of-charge (SOC) and temperature is achieved by applying extended Kalman filter (EKF) algorithm with only the terminal measurement of voltage and current. For the application of EKF algorithm, a nonlinear model which consists of a voltageand-thermal-dependent equivalent circuit model and a thermal model is(More)
The control objective of minimization of the fuel consumption and exhaust emission in hybrid electric vehicle (HEV) has generally been achieved by a supervisory controller. The drivability and NVH of HEV especially during mode changes, on the other hand, have drawn significant attention in recent years. In this paper, for the purpose of control simulation,(More)
Common-rail injection systems allow precise and flexible control of the fuel injection timings and injected fuel amount, resulting in improved fuel economy and reduced emissions. In this paper, an engine management system (EMS) is developed for a common-rail (CR) diesel engine. A common-rail test bench is used to facilitate the control development and(More)