Abstract
This study takes light-passenger vehicles with 1.5L port fuel injection turbocharged engine as the research object, based on the WLTC test cycle about the China 6b emissions regulations, including some influence of several key technologies, such as fuel injector selection, intake VVT opening, fuel control and gear shift point matching, what can affect the particulate emissions from light-passenger vehicles. The results show that without particulate filter (GPF) technology, Using the original 4-hole fuel injector, the opened intake air VVT in catalyst light off, the optimized fuel control and gearbox shift point, the emission test results of the light-passenger vehicle can reach the development target of China 6b, what can avoid GPF blockage and regeneration problems in the market. Meanwhile, the cost of mass production and development cycle about vehicle is effectively reduced.
Highlights
With the continuous improvement of vehicle ownership and the increasingly serious environmental protection problems, the motor vehicle emission laws and regulations have become increasingly perfect and the emission limits have become increasingly strict
Through the optimization of fuel injection beam and the application of 35MPa high-pressure fuel injection system, the engine emissions were greatly reduced to meet the requirements of GB 6B particulate emission limit; Gao Yuanyuan [6] and others, aiming at a 1.5L supercharged cylinder direct injection gasoline engine, reduced the fuel consumption level of the whole vehicle and meet the national 6B emission standard without GPF by adopting Miller cycle and combined with systematic friction reduction technology, split cooling and low-pressure exhaust gas recycling (EGR) technology
Compared with the GPF scheme, the development cost and development cycle of the vehicle are reduced because of the cancellation of GPF temperature and differential pressure sensor and its pipeline, GPF carrier. Several key technologies, such as injector selection, the opened intake air VVT in catalyst light off, fuel control optimization and shift point matching, were studied for port fuel injection turbocharged gasoline engine without the use of GPF technology. It meets the requirements of national 6B emission regulations, reduces the development cost and development cycle of the whole vehicle, and improves the market competitiveness of vehicle models
Summary
With the continuous improvement of vehicle ownership and the increasingly serious environmental protection problems, the motor vehicle emission laws and regulations have become increasingly perfect and the emission limits have become increasingly strict. Through the optimization of fuel injection beam and the application of 35MPa high-pressure fuel injection system, the engine emissions were greatly reduced to meet the requirements of GB 6B particulate emission limit; Gao Yuanyuan [6] and others, aiming at a 1.5L supercharged cylinder direct injection gasoline engine, reduced the fuel consumption level of the whole vehicle and meet the national 6B emission standard without GPF by adopting Miller cycle and combined with systematic friction reduction technology , split cooling and low-pressure exhaust gas recycling (EGR) technology. This study, for the first time, systematically proposes an optimization scheme to reduce particulate matter emissions and take gas emissions into account on a certain type of otto-cycle 1.5L intake injection supercharged engine, so as to make a certain type of vehicle with this engine meet the national 6B emission standard without GPF
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