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Selective catalytic reduction (SCR) is one of the most promising solutions to meet the future nitrogen oxides (NOx) emissions regulations for heavy-duty diesel vehicles. However, during transient operations, SCR inlet temperatures can drop below the optimal range and poor NOx conversion can result. To address the low NOx conversion problems encountered particularly in low load conditions, a new integrated...
Real-time fuzzy logic controllers (RFLC) have been developed for the VGT and EGR control on a heavy-duty diesel engine. Previous studies show that compared to the VGT and EGR controlled by conventional PID controllers, there is a increase of engine torque and a reduction of engine emissions when the engine is running on the same condition. This work carried out robustness evaluation of the RFLC control...
We consider a spark-ignition engine equipped with VVT actuators. This paper is an extension of a previously studied control technique (considered under atmospheric conditions). We show that the same control strategy boosts the torque production using VVT actuators under turbocharging conditions. At the light of reported experimental results, we stress the performance of the proposed control law and...
This paper presents an air- and fuel-path coordinated methodology for Diesel engine advanced combustion mode transient control. In the air-path loop, a reference governor method was utilized for the control of intake manifold conditions, so as to the in-cylinder conditions (ICCs) at the crank angle of intake valve closing. In the fuel-path loop, the active and rapid fuel injection timing and mass...
By analyzing air-fuel ratio control characteristics of pre-mixing coal-bed gas engine, an air-fuel ratio control scheme used in pre-mixing coal-bed gas engine is proposed. The air-fuel ratio fuzzy PID controller is built, which used in transient working condition and steady working condition of coal-bed gas engine. The simulation on the process of air-fuel ratio control is researched. This control...
The multi-sensor information fusion technology is briefly introduced in the article. The basic structure of air-fuel ratio control system with information fusion is discussed by combining the function and characteristics of air-fuel ratio control system of gasoline engine transient condition. The information fusion model of air-fuel ratio control of gasoline engine transient condition is proposed...
In the paper, a Hendricks Mean Value Engine Model is established by using SIMULINK. At the same time, a fuzzy neural network is designed. The AFR is simulated under transient conditions. The simulation result shows that: With no controller, when throttle degree is changed intensively, the AFR errors are large, With the FNN controller, the AFR errors can be controlled to a narrow range, and the system...
During the gasoline engine start process, air fuel ratio of gasoline engine always greatly departs the theoretical air fuel ratio by the affection of intake pipe fuel film. To decrease exhaust emission in engine start process, the dynamic characteristic of intake pipe fuel film is analyzed; a new dynamic fuel film model of intake pipe based on Aquino model is presented, and a fuel compensation method...
Investigate a kind of air fuel ratio control strategy that combined the modified Elman neural network and the traditional PI (proportional plus integral) controller. The neural network was used to estimate the air fuel ratio signal without transfer delay, which input signals consist of the crankshaft rotate speed, the throttle position, and the injection duration. The traditional PI controller was...
It is a challenge to control the transient air fuel ratio of gasoline engines accurately. In this work, the traditional PI controller was used to control the transient air fuel ratio by using the estimated signal. To verify the validity of the control strategy, a single cylinder gasoline engine model was built with GT (grand touring)-power. Based on this, the simulation model for controlling the air...
During the gasoline engine transient process, both fuel quantity and fuel film parameter change, fuel film dynamics balance in intake pipe is destroyed, which makes the fuel quantity from nozzle and fuel quantity into the cylinder not be equaled. Therefore, fuel film model need to be established accurately in order to control the air fuel ratio accurately. The costumed fuel film model of Aquino is...
For further meet increasing tightening standard of exhaust emission, accurate transient air/fuel ratio control is the key technology for modern automotive gasoline engine. Transient fuel film model has been established for four-stroke gasoline engine, and the fuel film model parameter identification been studied with least squares method. The fuel film model parameters have been gained on the basis...
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