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Starting, function - GF07.10-P-1001MMW

ENGINE 276.9 in MODEL 212.095 as of model year 2014 

Starting function requirements, general points 

Starting, general points 

The start of the internal combustion engine is initiated if the vehicle needs energy for the traction which cannot be delivered purely electrically or if changes in system conditions requires starting of the internal combustion engine. The start of the internal combustion engine is initiated automatically, without action on the part of the driver. The automatic engine start is dependent on various system conditions and from the current driving condition. It is requested by the ME-SFI [ME] control unit (N3/10). Starting takes place with the vehicle at a standstill, preferably via the electrical machine (A79/1) and in the electrical operation via the starter (M1). The internal combustion engine is also started over the starter in the vehicle standstill condition if the charge level of the high-voltage battery (A100g1) is not adequate. The required system conditions and prerequisites for starting the internal combustion engine are described in more detail in the following document:

Further partial functions are active when starting and are described in the following documents:

For starting, the ME-SFI [ME] control unit reads in the following sensors and signals:

The ME-SFI [ME] control unit actuates the following components or sends requests to the following control units to start the internal combustion engine:

Function sequence for start 

The starter control in the ME-SFI [ME] control unit takes on actuation and switching off of the starter and a request for the electrical machine and the wet clutch. The ME-SFI [ME] control unit coordinates the injection and firing order during starting based on the signals from the crankshaft Hall sensor and the camshaft Hall sensors. The rest of the function sequence is subdivided into the following operation steps:

Function sequence for starting with the starter in a vehicle standstill condition 

Through turning the transmitter key (A8/1) into the start position the start request from the driver is received by the ME-SFI [ME] control unit via the chassis CAN 1 from the electronic ignition lock control unit.

Start begin 

The ME-SFI [ME] control unit actuates the circuit 50 starter relay (N10/1kM) with a ground signal on both sides. The power contact on the starter relay closes and the starter solenoid switch is supplied at "circuit 50" with voltage from "circuit 30".

Ending start 

When engine cranking speed has reached 400 to 700 RPM, or after a starting time of 5 to 40 s (dependent on coolant temperature), the ME-SFI [ME] control unit interrupts the negative activation of the circuit 50 starter relay and thus terminates the starting procedure. The starting procedure can only be aborted by switching off the ignition.

Function sequence for starting with the electrical machine in a vehicle standstill condition 

The required motor torque of the electrical machine is calculated by the ME-SFI [ME] control unit for starting the internal combustion engine with the electrical machine in a vehicle standstill condition. In order to connect the internal combustion engine to the transmission the ME-SFI [ME] control unit makes the request via the drive train CAN to the fully integrated transmission control unit to actuate the wet clutch. Further information concerning actuation of the wet clutch is described in the following document:

After receiving the respective feedback over the closed wet clutch, the ME-SFI [ME] control unit requests actuation of the electrical machine via the hybrid CAN from the power electronics control unit in order to start the internal combustion engine. Recognition of the start end takes place over the motor speed or, over a differential torque analysis, between the motor torque generated by the electrical machine and the torque from the internal combustion engine. When engine cranking speed has reached 400 to 700 RPM, or after a starting time of 5 to 40 s (dependent on coolant temperature), the ME-SFI [ME] control unit interrupts the Start request to the power electronics control unit and thus ends the starting procedure.

Function sequence for starting with the starter and electrical machine in electrical operation 

During electrical operation with an opened wet clutch, starting always occurs first over the starter up to a certain rotational speed of the internal combustion engine. This should prevent any risk of jerking caused by the moment of inertia of the internal combustion engine.

The function sequence up to reaching the starting speed is identical with the:

If the required starting speed is achieved, the wet clutch is closed and the internal combustion engine is brought up to the idle speed by the engine drag torque of the drivetrain and starting over the starter is ended. Further information concerning actuation of the wet clutch is described in the following document:

The starting is ended after reaching the idle speed and the vehicle is in HYBRID driving mode with the internal combustion engine and electrical machine. Further information about the various driving conditions is described in the following document:

  Electrical function schematic for starting   PE07.10-P-2701-97DAU
  Overview of system components for gasoline injection and ignition system with direct injection   GF07.70-P-9998MMO
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