gf0710p1013ogs

Torque coordination, function

Type gf · topic 07.10 · version 0101 · 2015-01-30

Applies to: ENGINE 642.8 in MODEL 222

Where it sits

Function group 1 Engine › 07 Mixture formation › 07.10 Electronic engine control — Series 222

Also applies to engines/gearboxes: 642 8**

GF07.10-P-1013OGS

Torque coordination, function

14.1.15

ENGINE

642.8 in MODEL 222

Function requirements for torque coordination, general points

Circuit 87 (Engine management ON)

Engine runs

Torque coordination, general

The torque interface in the CDI control unit (N3/9) coordinates and prioritizes (according to drivability and defined priority) the requirements of all systems that make an engine torque request. It also determines how dynamically each request is to be implemented.

The following systems and functions can request engine torque:

Maximum torque limitation

Rpm limitation

Transmission control, fully integrated transmission control unit (Y3/8n4) (with code 427 (7G-TRONIC)) or (with code 421 (9G-TRONIC)) via the drive train CAN (CAN C1)

Cruise control, Electronic Stability Program control unit (N30/4) over chassis FlexRay (Flex E) to powertrain control unit (N127)

The driver, through the accelerator pedal sensor (B37)

DISTRONIC PLUS, over radar sensors control unit (N62/1) (with code P20 (Driving Assistance package) via chassis FlexRay

Function sequence for torque coordination

Depending on the dynamics of the requests, the CDI control unit varies the engine torque by:

Extending or shortening the injection period of the fuel injectors (Y76)

Increasing or lowering the fuel pressure in the rails via the pressure regulating valve (Y74) and quantity control valve (Y94)

Electrical function schematic for torque coordination

PE07.10-P-2713-97SEB

Overview of system components for common rail diesel injection (CDI)

GF07.16-P-9997OGS

Referenced documents