Pressurized fuel is supplied via a common rail to injectors which are energized by integral piezo actuators which react thirty times faster than solenoid injectors. (Peizo crystals deform when an electrical current is applied, and this movement operates the injector.) Injections are in two stages a pilot dose, followed by a main injection which helps control the burn and thereby reduce combustion noise (diesel rattle).
A lower 17.3.1 compression ratio further reduces noise and heat, and improves the burn to give lower fuel consumption and emission. Fuel is injected at up to 1650 bar. To further improve combustion, each cylinder has two inlet ports, a swirl port for low load efficiency, and a high volume port.
In place of the convention stop solenoid to shut off the fuel supply, the TDV6 engine is stopped by the ECM cutting the electrical supply to the piezo actuators in the injectors.
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