GF08.30-P-0001MEH Hybrid Drive System, Function

GF08.30-P-0001MEH Hybrid Drive System, Function
- ENGINES 272.974 in MODEL 221.095 /195

Hybrid drive system - general points
The hybrid drive system consists of the engine 272 Hybrid, the integral starter-alternator (A79), power electronics control unit (N129/1), the high voltage system with battery management system control unit (N82/2) and the DC/DC converter control unit (N83/1).

The automatic transmission and the regenerative braking system is not described here.

Controlling of the hybrid drive system and of the internal combustion engine is performed in the ME-SFI [ME] control unit (N3/10) in the version "ME 17.7". The abbreviated designation "ME 17.7" means:
M = Motronic
E = Electronic accelerator pedal
17.7 = Version 17.7 (Hybrid)

The following table represents the model and major assembly overviews for the hybrid drive system:





To do this the ME-SFI [ME] control unit exchanges data via the attached chassis CAN (CAN E), drive-CAN (CAN C) and drive train sensor CAN (CAN I) with other control units which are integrated in the CAN network.
The ME-SFI [ME] control unit also acts as the interface (gateway) between the three CAN bus systems.

Sensor data is directly read in directly by the hybrid drive system and indirectly by the CAN network and actuates the respective actors.

The following functions and systems are controlled and coordinated:
- Basic functions
- Hybrid system
- Internal combustion engine control
- Internal combustion engine injection system
- Internal combustion engine ignition system
- Internal combustion engine exhaust system

Basic functions
- Control system diagnosis
- Fault memory
- On-board diagnosis II (OBD II)
- Diagnosis via CAN
- CAN network with a Gateway function
- Flash programming
- Variant coding
- Drive authorization system 3 (DAS 3)
- Heat management
- Controlled intake/exhaust camshaft adjustment
- Torque coordination

Diagnosis
For diagnostic purposes, the Diagnosis Assistance System (DAS) can be used to read out and delete the fault codes for the hybrid drive system and to actuate certain specific diagnostic functions in a targeted manner.

Flash programming
The hybrid drive system in the ME-SFI [ME] control unit is flash programmable, that is the complete software in the control unit can be replaced using the DAS (installed new).
The software required to program the control units is provided on the STAR DIAGNOSIS DAS software DVD.

Variant coding
Using variant coding the following vehicle versions and equipment can be coded using the DAS:
- Vehicle model
- National version
- Exhaust variants

Hybrid system
- Energy management for the hybrid drive system
- Torque coordination for the hybrid drive system
- Automatic Start/Stop function
- Regenerative braking
- High-voltage battery cooling (A100g1)
- Power electronics cooling system

Internal combustion engine control
- Throttle flap control
- Safety fuel shutoff
- Transmission overload protection
- Secondary air injection
- Suction fan actuation
- Calibration of throttle valve
- Intake manifold length switchover
- Electronic stability program request (ESP)
- Fully integrated transmission control request (VGS)

Internal combustion engine injection system
- Sequential port injection
- Start, post-start phase and acceleration enrichment
- Warm running regulation
- Idle speed control
- Cylinder-selective fuel metering
- Limp-home function
- Inertia fuel shutoff
- Fuel pump control unit (M3)
- Altitude adaptation
- Load change function
- Rpm limitation

Internal combustion engine ignition system
- Single spark ignition
- Ignition map
- Rpm limitation by retarding ignition angle
- Knock sensor system
- Synchronization of camshaft and crankshaft positions

Internal combustion engine exhaust system
- Catalytic converter heating
- Oxygen sensor heater control unit
- Straight-line lambda control

The operating conditions of the hybrid drive system and the active partial functions of the hybrid drive system are described in the following documents:
- Start hybrid drive system, function
- Driving, function
- Deactivation of hybrid drive system, function
- Energy management for hybrid drive system, function
- Recuperative braking, function
- High-voltage system cooling, function
- Internal combustion engine, function