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.

DENSO Technology – Leading the World

• In 1995, DENSO launched the world’s first common rail system for trucks.
  
• In 2002, DENSO launched a 1,800-bar common rail system that achieved the industry’s highest injection pressure, and five-time multiple injections at a high accuracy. This system comfortably cleared EURO4 emission regulations without a diesel particulate filter.


• In 2007, DENSO announced plans to launch a 2,000-bar common rail system with 9 time multiple injections.

• DENSO’s common rail system can inject fuel at up to 2,000 bar, significantly reducing the concentration of PM in emissions.
  
• DENSO’s new injectors can perform nine injections during each combustion stroke. The nine times multiple injections, including pilot injection with a predetermined small fuel quantity, reduce PM and NOx in emissions, and achieve quietness at idling equivalent to gasoline-powered engines.
  
• The high fuel injection pressure is generated by the supply pump, which is the lightest in the world for passenger car common rail systems.