Speciated Hydrocarbon Emissions of SI Engine During Cold Start and Warm-up

High automotive hydrocarbon emission during cold start is a well recognized challenge with increasing importance in moving towards green vehicles. In this work the application of a linear model reduction technique on the design of a controller for a nonlinear system is discussed. A reduced order cold start model of an SI engine and aftertreatment system is realized using a balanced truncation technique. Sliding mode controllers, derived from a nonlinear physical model and the reduced order model, are designed to reduce tailpipe hydrocarbon emissions. The comparison results indicate the controller derived from the balanced truncated model performs better since it adjusts the control inputs such that it favors the certain desired trajectories which are more influential on the final control target.

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Development of a Fuelling System to Reduce Cold-Start Hydrocarbon Emissions in an SI Engine

10.4271/961119 ◽

1996 ◽

Cited By ~ 2

Author(s):

S. D. Jackson ◽

P. A. Williams ◽

T. Ma

Keyword(s):

Cold Start ◽

Hydrocarbon Emissions ◽

Si Engine

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The Sources of Unburnt Hydrocarbon Emissions from Spark Ignition Engines during Cold Starts and Warm-Up

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/pime_proc_1994_208_152_02 ◽

1994 ◽

Vol 208 (1) ◽

pp. 1-11 ◽

Cited By ~ 28

Author(s):

D J Boam ◽

I C Finlay ◽

T W Biddulph ◽

T A Ma ◽

R Lee ◽

...

Keyword(s):

Collaborative Research ◽

Research Study ◽

Cold Start ◽

Spark Ignition ◽

Hydrocarbon Emissions ◽

Spark Ignition Engines ◽

Warm Up ◽

Valve Engine ◽

Cold Starts

The results of a three-year collaborative research study into the sources of unburnt hydrocarbon (uHC) emissions are reported. The study sought to extend existing knowledge of the sources in an engine to the crucial period following a cold start and before the exhaust catalyst becomes fully effective. The study, carried out on a range of engines but centred on the Rover M 16 four-valve engine, identified a number of sources, all of which are equally important in the warm-up period. The paper concludes with some recommendations for the control of uHC emissions

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Modelling and Fuzzy-Threshold Control of SI Engine for Emission Reduction during Cold Start Phase

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.16.4.2019.05.0539 ◽

2019 ◽

Vol 16 (4) ◽

pp. 7225-7242

Author(s):

O. Khalilikhah ◽

M. Shalchian

Keyword(s):

Combustion Engine ◽

Cold Start ◽

Model Parameters ◽

Si Engine ◽

Threshold Control ◽

Operating Condition ◽

Warm Up ◽

Engine Efficiency ◽

Start Up ◽

Harmful Emissions

We present a controllable model of an internal combustion engine that captures the overlapping of the cylinder valves as a controllable parameter and its effect on engine efficiency and EGR rates. The model parameters have been calibrated for the EF7 engine and validated with experimental data. This model successfully estimates the performance and HC and NOx emissions concentration of the engine under cold start operating condition. A model-based fuzzy-threshold control strategy has been proposed in cold start operating condition. This strategy uses the overlapping angle of the cylinder inlet and outlet valves as an extra degree of freedom in comparison to the regular PID strategy in order to accelerate the warm-up duration the catalyst converter while reduces the exhaust harmful emissions during the warm-up phase. The proposed controller model has been verified in MATLAB Simulink environment and simulation results indicates 8.6% reduction of the start-up time of the catalyst converter and reduction of 3.5%, 8.5% and 7% of HC, NO and fuel consumption respectively during the catalyst warm-up phase.

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