The diagram shows the boost pressure system for a turbocharger with variable turbine geometry and solenoid valve control 1 Boost pressure control solenoid valve 2 MAP sensor 3 IAT sensor 4 Intercooler (not on all versions) 5 Vacuum unit for variable turbine geometry 6 Turbocharger(s) 7 PCM 8 Vacuum pump The figure depicts the charge… Read More »
1 EGR solenoid valve 2 MAF sensor 3 PCM 4 Oxidation catalytic converter 5 Turbocharger(s) 6 EGR valve 7 Vacuum pump 8 Position sensor in EGR valve 9 Intercooler (not on all versions) 10 EGR cooler (not on all versions) When turbochargers are used (they are deployed on all the diesel engines described here), the… Read More »
1 High pressure pump 2 Fuel metering valve 3 Fuel rail 4 Fuel pressure sensor 5 PCM The following comprehensive tests are carried out: • Measuring the differential pressure during engine start (comparison between desired and actual fuel pressure). • Measuring the differential pressure during engine running (comparison between desired and actual fuel pressure). The… Read More »
1 IDM/PCM 2 High pressure pump 3 High-pressure chamber 4 Fuel supply 5 Fuel metering valve 6 Fuel pressure sensor 7 Fuel rail 8 Solenoid valve 9 Injector needle The engine management system on the common rail injection system is capable of providing the optimum injection pressure for each operating condition. Fuel is compressed via… Read More »
The diagram shows the two-module system. On the single-module system the IDM is integrated in the PCM. 1 Pilot injection and main injection fuel quantity 2 IDM 3 PCM 4 Fuel injector With the common rail injection system, a small injected fuel quantity for pilot injection is injected into the combustion chamber prior to the… Read More »
1 Top dead center 2 Pressure curve without pilot injection 3 Combustion pressure in the cylinder 4 Pressure curve with pilot injection 5 Injector needle lift 6 Injector needle lift for pilot injection 7 Injector needle lift for main injection 8 Crank angle The pilot injection brings about a preconditioning of the combustion chamber and… Read More »
In addition to the previously described external load moments, there are also combustion quality phenomena and internal friction moments which need to be balanced out. These change slightly, but continuously, over the entire service life of the engine. In addition, the individual cylinders do not generate the same level of torque for the entire service… Read More »
Sudden actuation of accelerator 1 Engine speed 2 Abrupt actuation of accelerator pedal (driver demand) 3 Engine speed curve without active judder damping 4 Engine speed curve with active judder damping 5 Time There is a so-called software filter between the accelerator pedal calculation and the calculation unit. When the accelerator is actuated or released… Read More »
The diagram shows the two-module system. On the single-module system the IDM is integrated in the PCM. 1 Pilot injection and main injection fuel quantity 2 IDM 3 PCM 4 Fuel injector 5 CKP 6 APP In normal driving mode, the injected fuel quantity is calculated from the following main parameters: • APP, • Engine… Read More »
When starting the engine, the injected fuel quantity is calculating as a function of Cylinder Head Temperature and engine speed. The starting fuel quantity is delivered from the time the ignition is switched on until a specific minimum engine speed is reached. The driver does not have any influence on the start quantity.