Input signals, shown on engine 471.9 |
A4 | Engine management control unit (MCM) |
B608 | Charge air pressure and temperature sensor in charge air pipe |
B611 | Temperature sensor downstream of air filter (only for engine version Euro VI Standard) |
B617 | Charge air temperature sensor in charge air distributor |
B621 | Exhaust gas recirculation (AGR) differential pressure sensor |
CAN 4 | Drive train CAN |
G07.16-3142-81
General
The air mass, along with the coolant temperature, engine speed or fuel temperature, is one of the most important factors required by the engine management to regulate the injection quantity. The injection quantity can only be exactly calculated with the aid of the air mass.
Function
Determination of the air mass occurs over the engine management (MCM) control unit (A4). This uses the following information, which is determined via the charge air pressure and temperature sensor in the charge air pipe (B608), the temperature sensor downstream of the air filter (B611) (only for engine version Euro VI Standard), the exhaust gas recirculation (EGR) differential pressure sensor (B621), and the charge air temperature sensor in the charge-air distributor (B617):
Air mass of the actual suctioned in or supercharged fresh air
Exhaust mass of actual recycled exhaust
The engine management (MCM) control unit (A4) can derive the air mass which is routed to the internal combustion engine for combustion from these values.
Engine management (MCM) control unit, component description | A4 | ||
Charge air pressure and temperature sensor in charge air pipe, component description | B608 | ||
Temperature sensor downstream of air filter, component description | Only for engine version Euro VI Standard | ||
Charge air temperature sensor in charge air distributor, component description | B617 | ||
Exhaust gas recirculation differential pressure sensor, component description | B621 |