Cylinder pressure data at different oil temperatures (20℃、30℃、40℃) and corresponding different spark angles (0oBTDC、6oBTDC、12oBTDC ) were sampled in experiments of BN491DQ engine. Emissions at start were measured. Ignition advance angle, combustion cycle variation, intake system difference affect cold start.
Starting from the primary reasons of HC emissions during cold starting phase,effects of air fuel ratio and ignition advance angle are analyzed,and out-of-engine measures and post-processing technologies to meet re-quirements of EUROⅡand EUROⅢemission regulations and to reduce HC emissions during cold starting phase inside and outside of China,and different exhaust post-processing technology equipments are compared.
Result of the research shows that fuel e-conomy of gasolene engine may be sufficiently improved by combining VVT method and VCRmethod with optimum ignition advance angle,and potentiality of WT method and VCR methodmay be exploited out to the greatest extent.
Effects of air-fuel ratio and ignition timing on the emissions HC, CO and NOx of LPG EFI engine is presented. Experiments were carried out in a four-stroke, water-cooled, 125mL motorcycle SI engine fueled with LPG.
Some factors such as air/fuel ratio, ignition advanced angle, compression ratio, valve timing and transmission ratio, which affect the fuel economy of modern car gasoline engines have been studied in depth and the corresponding experiments have been done.
Based on the tests and research, this paper discusses the influence of engine adjustment on exhaust emission, such as idling adjusting, spark plug gap, distributor breaker gap, ignition advanced angle, valve clarance, etc.
Homogeneous charge compression ignition (HCCI) has challenges in ignition timing control, combustion rate control, and operating range extension.
The effects of catalytic combustion on the ignition timing, the temperature and CO concentration fields, and HC, CO and NOx emissions of the HCCI engine were discussed.
The results showed the ignition timing of the HCCI engine was advanced and the emissions of HC and CO were decreased by the catalysis.
Among many kinds of factors that affect cold start operation, ignition timing is crucial to improve emission characteristics due to the influence on exhaust gas temperature.
We use new sensors to measure the pressure in the combustionchamber and analyze this signal with a neural network in order to receiveseveral form factors which can be used to control the ignition timing.