DENSO's solenoid injector can inject fuel at an interval of 0.4 milliseconds with a required small quantity -- only one cubic millimeter per pilot injection. The injectors allow the system to perform five injections during each combustion stroke. DENSO's proprietary technologies in material development and processing enabled the solenoid injector to achieve high performance with a fatigue strength sufficient for 1,800 bar injection pressure.

5-Time Multiple Injections

The five-time multiple injections are named "pilot," "pre," "main," "after, and "post" injections, respectively. The "pilot" injection, well before ignition, provides time for fuel and air to mix. The subsequent "pre" injection shortens ignition delay in the main injection and thereby reduces the generation of NOx, noise and vibration. The "after" injection, which happens a split-second after the main injection, re-burns any remaining PM. Then, the "post" injection helps manage the temperature of the exhaust gas, which makes the exhaust processing in the after-treatment system more effective.