At the beginning of the 21st century, emission regulations for diesel vehicles are getting tougher year by year, particularly in the European market.
However, from the global environmental protection point of view, diesel vehicles, with reduced CO2 output compared to gasoline vehicles, are attracting attention, and increasing their share in European markets in particular.
Since the beginning of the world first production of common rail systems for trucks by DENSO in 1995, DENSO went on to start production of common rail systems designed for passenger cars in 1999. Furthermore, DENSO began production of a “Second Generation Common Rail System” for passenger cars last year, which achieved an ultra-high pressure injection of 180MPa for the first time in the world. Thanks to the multiple injection with highly accurate and small-quantity injection technologies under ultra-high-pressure of 180MPa, DENSO has successfully enabled a 2-litter engine with a vehicle body weight of 1600kg to comply with the EURO4 regulation without DPF (Diesel Particulate Filter) while maintaining a 100kW output possibility, and reaching a quietness similar to gasoline engines.
This report gives an overview of this 2nd generation common rail system developed by DENSO, and proposes future technologies to meet further stricter exhaust emission regulations.