Combustion Engine Forced Start, Basic Function - GF07.10-P-1059A

Engine all (CAR) 

Overview 

This document contains information on:

• General 
• Function requirements 
• Function 

General 

The forced engine start ensures that the engine can still run in the event of insufficient supply to the on-board electrical system. In this case, the engine is autonomously force started by the combustion engine control unit.

Function requirements 

• Coolant temperature > 115 °C
• Exceeding of engine stop period > 3 min
• Vehicle speed > 2 km/h in forward travel
• Rolling backwards
• The ECO start/stop function is deactivated.
• On-board network condition requires the engine to run.
• Brake assistance or distance control system in control intervention function
• Vacuum at brake booster not in specified range
• Air conditioning system requires engine to be running.
• System or communication error in the following systems: steering, on-board electrical system, brake system, accelerator pedal, transmission, engine

Function 

A forced engine start is also conducted if the stability of the on-board electrical system can no longer be assured, e.g. as a consequence of load-intensive consumers. The engine will continue to run until sufficient stability of the on-board electrical system can be ensured.

The ECO start/stop function is switched off if the stability of the on-board electrical system is not assured.