Method and auxiliary control unit for cold start optimization of an internal combustion engine
The present invention relates to a method ( 100 ) for cold start optimization of an internal combustion engine ( 10 ) comprising: determining ( 110 ) a start of an engine preheating device ( 12 ); transmitting ( 115 ) a selected coolant temperature T cool_trans to an engine control unit ( 14 ); and adapting ( 140 ) the selected coolant temperature T cool_trans transmitted to the engine control unit ( 14 ) to a current coolant temperature T coll_current during a time interval Δt following the start of the internal combustion engine ( 10 ). The present invention further relates to an auxiliary control unit ( 22 ) which is configured to execute the method ( 100 ).
1. Method for cold start optimization of an internal combustion engine comprising:
determining, by an auxiliary control unit, a start of an engine preheating device;
transmitting, by the auxiliary control unit, a selected coolant temperature T cool_trans to an engine control unit, wherein the selected coolant temperature T cool_trans differs from a current coolant temperature T cool_current during a time interval Δt following the start of the internal combustion engine; and
adapting, by the auxiliary control unit, the selected coolant temperature cool_trans transmitted to the engine control unit to the current coolant temperature T cool_current during the time interval Δt following the start of the internal combustion engine.
2. Method according to claim 1 , wherein detecting a temperature T takes place when the engine preheating device starts.
3. Method according to claim 2 , wherein setting of the selected coolant temperature T cool_trans transmitted to the engine control unit occurs when the internal combustion engine starts in dependence of the detected temperature T.
4. Method according to claim 3 , wherein setting of the selected coolant temperature T cool_trans transmitted to the engine control unit to the temperature T detected when the engine preheating device starts takes place when the internal combustion engine starts.
5. Method according to claim 1 , wherein setting of the selected coolant temperature T cool_trans transmitted to the engine control unit to a fixed value T fix takes place when the internal combustion engine starts.
6. Method according to claim 1 , wherein the engine preheating device heats coolant of a cooling circuit of the internal combustion engine after its start and heats a vehicle interior with the aid of the heated coolant.
7. Method according to claim 1 , wherein the time interval Δt begins with the start of the internal combustion engine.
8. Method according to claim 1 , wherein the time interval Δt lasts a maximum of one minute, preferably between 10 seconds and 30 seconds.
9. Method according to claim 1 , wherein adapting of the coolant temperature T cool_trans transmitted to the engine control unit to the current coolant temperature T cool_current takes place uniformly and linearly during the time interval Δt.
10. Method according to claim 1 , wherein adapting of the coolant temperature T cool_trans transmitted to the engine control unit to the current coolant temperature T cool_current takes place immediately when the current coolant temperature T cool_current exceeds an admissible maximum value T max .