DENSO’s leadership in diesel common rail technology is unsurpassed in the industry. In 1995, we launched the world’s first diesel common rail injection system for trucks. The following year, we began supplying diesel common rail injection systems for passenger cars. Since then, DENSO has been actively involved in developing advanced diesel engine technologies to meet customer needs as well as stringent worldwide emission regulations.
Diesel engines combine excellent fuel economy and power, and their popularity is growing. The development of the common rail system is a landmark in significantly improving the diesel engine capabilities. DENSO's diesel engine management system will expand to include intake air and exhaust gas recirculation (EGR) management and exhaust gas treatment, in addition to the common rail system as a core of the management system.
The common rail system accumulates high-pressure fuel in the common rail and injects the fuel into the engine cylinder at timing controlled by the engine ECU, allowing high-pressure injection independent from the engine speed. As a result, the common rail system can reduce harmful materials such as nitrogen oxides (NOx) and particulate matter (PM) in emissions and generates more engine power.
DENSO leads the industry in increasing fuel pressure and maximizing the precision of injection timing and quantity, achieving cleaner emissions and more powerful engines. DENSO's common rail systems are supplied to a variety of vehicles including passenger cars and commercial vehicles.