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Development of PZEV Exhaust Emission Control System
Technical Paper
2003-01-0817
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A new exhaust emission control system has been developed which complies with the world's most severe emission standard: CARB PZEV. Leaner combustion in cold condition was enabled and rapid warm-up of a close-coupled catalyst was realized by utilizing a newly developed Intake Air Control Valve (IACV) system and hyper-atomization fuel injector. In addition, the newly developed HC adsorbing type 3-way catalyst realized cold HC reduction at lower cost.
For further reduction of the exhaust emission, the Variable Valve Timing-Intelligent (VVT-i) system was positively operated immediately after the cold start. By the suitable operation of Variable Valve Timing (VVT), the blow-back from the cylinder enhanced the fuel atomization and re-burning of remaining unburned hydrocarbons (HCs), and increased in-cylinder residual gas reduces NOx. In addition, to pursue a better catalyst conversion rate after warm-up, the oxygen (O2) sensor downstream of the close-coupled catalyst was improved to a new type. We have thus developed an exhaust emission control system with less emission variability to comply with the 15 years or 150k miles warranty.
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Kidokoro, T., Hoshi, K., Hiraku, K., Satoya, K. et al., "Development of PZEV Exhaust Emission Control System," SAE Technical Paper 2003-01-0817, 2003, https://doi.org/10.4271/2003-01-0817.Also In
References
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