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This paper presents a multi-variable optimal controller design based on model predictive control (MPC) scheme for automotive gasoline engines. The optimal control aims to achieve fast torque tracking with the lower pumping loss, by tuning the throttle valve angle and the intake valve timing. To this end, the nonlinear engine model was built based on the mean-value modeling theory and polynomial technique,...
Reed valve is widely used in compressors. It is one of the most important compressor components. Its performance affects the compressor's efficiency. The creation of a mathematical model considering both the thermodynamic process and valve movement of the compressor involves two important coefficients: flow coefficient and effective action area coefficient. So far, no mathematical method has yet been...
As an important section in the chain of semiconductor products manufacturing, dispensing techniques and relevant dispensers drawn increasing attentions of the researchers and engineers in recent years. In some applications, the dispenser cycles are required to be completed within 2 ms and the corresponding dot diameters are usually in micrometer scale, and sometimes even in nanometer scale when extremely...
In this paper, the torque control problem for spark-ignition engines is considered. The objective is to provide good output torque tracking with minimum fuel consumption, while avoiding engine knock and misfire. To this end, three control strategies are proposed: a feed-forward controller with recalibrated engine maps, a PI control scheme and a model predictive controller. For the model predictive...
Low Temperature Combustion (LTC) modes in diesel engines are characterized by enhanced homogeneity of the combustion mixture resulting from a longer ignition delay when compared to conventional diesel combustion. This is enabled by charge density and dilution control, coupled with modulation of fuel injection parameters. Charge dilution is achieved by exhaust gas recirculation (EGR), while turbocharging...
In order to improve the performance of 16V240ZJB diesel engine, the method of steady flow test and CFD numerical simulation was adopted to do intake port structure optimization study. The previous design model of intake port was tested in the steady flow experiment system which provided the boundary condition for simulation calculation. The three-dimensional CAD model of intake port was built and...
The three dimensional flow field in the intake port of the non-road small spark-ignition engine was carried on the numerical simulation computation. Through the analysis of flow field, we studied how to reduce the mutations of intake port cross-section and improve the flow capacity of the intake port using numerical simulation method. After the parameter optimization, the gas flow increased to 31...
This paper presents the design and simulation results for a novel off-idle engine torque control strategy that uses online model predictive control (MPC) to simultaneously manage drivability, emissions, and fuel economy, while delivering desired engine torque. In order to achieve a tractable optimization, a modular control approach is used, wherein MPC is used to manipulate desired air/fuel ratio,...
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