The EOBD system does not use any additional sensors or actuators to individually measure pollutants in the exhaust emissions. The EOBD system is integrated into the software of the PCM and uses the existing sensors and actuators of the engine management system. With the aid of these sensors, actuators and the special software, systems and… Read More »
At the time of going to press emission standard IV applies in Europe. In the diesel sector, emission standard IV is achieved using two different methods. One method consists of reducing exhaust emissions by means of internal engine measures to the extent that the prescribed limit values are met. Measures for the reduction of exhaust… Read More »
Needle lift of injector nozzle with pre- and post-injection 1 Needle lift 2 Pilot injection 3 Crank angle 4 Main injection 5 Advanced post-injection 6 Retarded post-injection For vehicles with a diesel particulate filter system two post-injections are employed during the regeneration process, in addition to the pre- and main injections, depending on the requirements.… Read More »
Needle lift of fuel injector nozzle and pressure curve in the cylinder with pilot injection 1 Combustion pressure in the cylinder 2 Needle lift 3 TDC 4 Needle lift for pilot injection 5 Needle lift for main injection 6 Crank angle In the case of vehicles with common rail injection systems electrically-controlled pilot injection occurs… Read More »
Needle lift of fuel injector nozzle and pressure curve in the cylinder without pilot injection 1 Combustion pressure in the cylinder 2 Needle lift 3 TDC (Top Dead Center) 4 Needle lift for simple main injection 5 Crank angle In the case of diesel engines with a distributor-type fuel injection pump (for example in the… Read More »
As already mentioned at the beginning of the lesson, the exhaust emissions and fuel consumption of an engine are of great significance. These factors can only be minimized through precise operation of the injection system and comprehensive engine management strategies. Consequently, the following requirements must be met by the common rail system: • The injection… Read More »
Increasingly higher demands are being placed on modern diesel engines. The focus is not only on exhaust emissions but also on increasing environmental awareness and the demand for increasingly better economy and enhanced driving comfort. This requires the use of complex injection systems, high injection pressures and accurate fuel metering by fully electronically-controlled systems. The… Read More »