Development of PZEV Exhaust Emission Control System

Kidokoro, Toru; Hoshi, Kiyoshi; Hiraku, Keizo; Satoya, Koichi; Watanabe, Takashi; Fujiwara, Takahiko; Suzuki, Hiroyoshi

doi:10.4271/2003-01-0817

Cited by 36 publications

(8 citation statements)

References 4 publications

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“…Although the function of a three-way catalytic converter (TWC) has remained relatively constant during its nearly forty years of use on light-duty gasoline vehicles, the primary converter components (catalytic coatings, substrates, mounting materials, stainless steels) have gone through a continuous evolution and redesign processes aimed at improving the overall performance of the converter [6]. These catalytic converter advances include improvements in catalytic converter washcoats, precious metal loading, and substrate designs, in combination with better vehicle fuel control systems [7,8,9]. A similar re-engineering effort has occurred with other exhaust system components, such as exhaust manifolds, oxygen sensors and exhaust pipes, that complement improvements in catalytic converter technology.…”

Section: Background and Introductionmentioning

confidence: 99%

Emission Performance of California and Federal Aftermarket TWC Converters

Brezny¹,

Kubsh²

2013

SAE Technical Paper Series

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Original equipment (OE) catalytic converters are designed to last the life of properly tuned and maintained vehicles. Many high mileage vehicles require a replacement converter because the original catalyst was damaged, destroyed, or removed, and the cost of a new OE converter on an older vehicle is difficult to justify. In the U.S., a federal aftermarket converter program has been in place since 1986 (California in 1988) and it has resulted in the replacement of over 50 million converters. Both Federal and California programs have required aftermarket converters to meet minimum performance and durability standards.

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Section: Background and Introductionmentioning

confidence: 99%

Emission Performance of California and Federal Aftermarket TWC Converters

Brezny¹,

Kubsh²

2013

SAE Technical Paper Series

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“…In particular, the temperature of the intake valve is important for triggering vaporization during the first engine cycle. After the first successful fired cycle, backflow of hot residual gases into the intake port aids in vaporizing the fuel in subsequent cycles [8,9].…”

Section: Introductionmentioning

confidence: 99%

Critical firing and misfiring boundary in a spark ignition methanol engine during cold start based on single cycle fuel injection

Li¹,

Gong²,

Qu³

et al. 2015

Energy

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“…In conventional CVVT engines, valve overlap used to be eliminated to improve the startability and stable idling quality at the start phase. However, some amounts of overlap promote fuel atomization by the blow-back gases which are at high temperature [7]. In this study, combustion phenomena according to various intake valve timings and spark timings were evaluated to achieve low cold-start emissions and rapid catalyst light-off performance during the cold start phase including the idle transient operation of the gasoline CVVT engine.…”

Section: Introductionmentioning

confidence: 99%

Effects of various intake valve timings and spark timings on combustion, cyclic THC and NOX emissions during cold start phase with idle operation in CVVT engine

et al. 2008

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In a gasoline SI engine, valve events and spark timings put forth a major influence on overall efficiency, fuel economy, and exhaust emissions. Residual gases controlled by the valve overlap can be used to reduce NOx emissions and the spark retardation technique can be used to improve raw THC emissions and catalyst light-off performance during the cold start phase. This paper investigated the behaviors of the engine and its combustion characteristics with various intake valve timings and spark timings during the fast idle condition and cold start. And cyclic THC and NOx emissions were measured at the exhaust port and their formation mechanisms were examined with fast response gas analyzers. As a result, THCs and NOx were reduced by 35% and 23% with optimizing valve overlap and spark advance during the cold transient start phase. Consequently, the valve events and ignition timings were found to significantly affect combustion phenomena and cold-start emissions.

show abstract

Development of PZEV Exhaust Emission Control System

Cited by 36 publications

References 4 publications

Emission Performance of California and Federal Aftermarket TWC Converters

Emission Performance of California and Federal Aftermarket TWC Converters

Critical firing and misfiring boundary in a spark ignition methanol engine during cold start based on single cycle fuel injection

Effects of various intake valve timings and spark timings on combustion, cyclic THC and NOX emissions during cold start phase with idle operation in CVVT engine

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