By H Zhao
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Additional resources for Advanced direct injection combustion engine technologies and development: Volume 2: Diesel engines
Fuel is injected by a third-generation Bosch piezo common rail fuel injection system operating up to 180 MPa which, with a new variable nozzle turbocharger and higher combustion pressures, gives an increased peak power of 132 kW with a maximum torque of 380 Nm. The variable swirl control valve is electrically operated to provide more precise control and the EGR system has been upgraded to incorporate a cooler bypass to stabilise combustion at lower exhaust gas temperatures. Exhaust after-treatment includes a typical oxidation catalyst and an upgraded DPF (Fritz, 2008).
These may have inward- or outward-opening poppet valves, depending on the type of actuator. Linear solenoids, stepper motors, torque motors and DC motors are types of electric actuators being used and developed by various component suppliers. These offer the advantage of faster and more precise operation compared to a conventional vacuum motor system. 13 shows a direct-drive DC motor-actuated EGR valve. 12 Early pneumatic single-poppet EGR valve (1980) (courtesy of Pierburg GmbH). 13 Direct drive DC-motor actuated single/dual-poppet EGR valve: (a) photograph, (b) cross-section diagram (courtesy of Pierburg GmbH).
Fuel is injected by a third-generation Bosch piezo common rail system operating up to 1600 bar. , 2004). 2 l TDI V8’. This engine uses Bosch’s third-generation piezo common rail system, utilising a maximum rail pressure of 1600 bar, and two Garrett ‘step-3’ variable geometry exhaust turbochargers. , 2005). In 2007, following their success at Le Mans with the R10 TDI, Audi presented the V12 TDI diesel for the Q7 vehicle. A high level of transfer from race to road engine followed, according to Wolfgang Ullrich, Audi’s Head of Motorsport: ‘The combustion and injection system of this engine are nearly identical with that of the R10 TDI’, said Ullrich (Christoffel, 2007).
Advanced direct injection combustion engine technologies and development: Volume 2: Diesel engines by H Zhao