Method for operating a hybrid motor vehicle
A method for operating a hybrid motor vehicle. In one example, the vehicle comprises an internal combustion engine ( 10 ) and at least one electric motor ( 20 ). As long as at least one parameter of an exhaust gas aftertreatment system ( 12 ) of the internal combustion engine ( 10 ) lies outside a given range, the starting of the internal combustion engine ( 10 ) is delayed and the internal combustion engine ( 10 ) is dragged by the electric motor ( 20 ). At the same time at least one measure is carried out which changes the parameter.
1. A method for operating a hybrid motor vehicle that includes an internal combustion engine ( 10 ) and at least one electric motor ( 20 ), the method comprising:
as long as at least one parameter of an exhaust gas aftertreatment system ( 12 ) of the internal combustion engine ( 10 ) lies outside a given range, delaying starting of the internal combustion engine ( 10 ), dragging the internal combustion engine ( 10 ) by the electric motor ( 20 );
determining a temperature (T 12 ) of the exhaust gas aftertreatment system as one parameter;
when the temperature (T 12 ) lies below a temperature threshold value, heating the exhaust gas aftertreatment system with a burner ( 16 ) arranged in an exhaust gas line ( 11 ) between a nitrogen storage (NSC) catalyst ( 13 ) and a selective catalytic reduction (SCR) catalyst ( 14 );
determining a nitrogen oxide load (B NOx ) of the nitrogen oxide storage catalyst ( 13 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter; and
when the nitrogen oxide load (B NOx ) exceeds a nitrogen oxide load threshold value, dispensing fuel into an exhaust gas line of the internal combustion engine ( 10 ).
2. The method according to claim 1 , including determining an ammonia load (B NH3 ) of an SCR catalyst ( 14 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter.
3. The method according to claim 2 , when the ammonia load (B NH3 ) is below an ammonia load threshold value, dispensing ( 63 ) ammonia or an ammonia-cleaving reagent into an exhaust gas line ( 11 ) of the internal combustion engine ( 10 ).
4. The method according to claim 3 , including checking whether the exhaust gas aftertreatment system ( 12 ) is ready to operate, and starting the internal combustion engine when the temperature (T 12 ) lies at or above a temperature threshold value, the nitrogen oxide load (B NOx ) is at or below a nitrogen oxide load threshold value, and the ammonia load (B NH3 ) is at or above an ammonia load threshold value.
5. A non-transitory computer-readable storage medium comprising instructions that when executed by a computer cause the computer to control a hybrid motor vehicle that includes an internal combustion engine ( 10 ) and at least one electric motor ( 20 ), by:
as long as at least one parameter of an exhaust gas aftertreatment system ( 12 ) of the internal combustion engine ( 10 ) lies outside a given range, delaying starting of the internal combustion engine ( 10 ), dragging the internal combustion engine ( 10 ) by the electric motor ( 20 ), and, at the same time, carrying out at least one measure which changes the parameter;
determining a temperature (T 12 ) of the exhaust gas aftertreatment system as one parameter;
when the temperature (T 12 ) lies below a temperature threshold value, controlling a heating of the exhaust gas aftertreatment system by a burner ( 16 ) arranged in an exhaust gas line ( 11 ) between a nitrogen storage (NSC) catalyst ( 13 ) and a selective catalytic reduction (SCR) catalyst ( 14 );
determining a nitrogen oxide load (BNOx) of the nitrogen oxide storage catalyst ( 13 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter; and
when the nitrogen oxide load (BNOx) exceeds a nitrogen oxide load threshold value, controlling a dispensing of fuel into an exhaust gas line of the internal combustion engine ( 10 ).
6. The non-transitory computer-readable storage medium according to claim 5 , wherein the instructions executed by the computer cause the computer to: determine an ammonia load (B NH3 ) of an SCR catalyst ( 14 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter.
7. The non-transitory computer-readable storage medium according to claim 6 , wherein the instructions executed by the computer cause the computer to: when the ammonia load (B NH3 ) is below an ammonia load threshold value, control dispensing ( 63 ) of ammonia or an ammonia-cleaving reagent into an exhaust gas line ( 11 ) of the internal combustion engine ( 10 ).
8. The non-transitory computer-readable storage medium according to claim 7 , wherein the instructions executed by the computer cause the computer to check whether the exhaust gas aftertreatment system ( 12 ) is ready to operate, and start the internal combustion engine when the temperature (T 12 ) lies at or above a temperature threshold value, the nitrogen oxide load (B NOx ) is at or below a nitrogen oxide load threshold value, and the ammonia load (B NH3 ) is at or above an ammonia load threshold value.
9. An electronic controller ( 40 ) for operating a hybrid motor vehicle that includes an internal combustion engine ( 10 ) and at least one electric motor ( 20 ), wherein the electronic controller is configured to:
as long as at least one parameter of an exhaust gas aftertreatment system ( 12 ) of the internal combustion engine ( 10 ) lies outside a given range, delay starting of the internal combustion engine ( 10 ), while dragging the internal combustion engine ( 10 ) by the electric motor ( 20 );
determine a temperature (T 12 ) of the exhaust gas aftertreatment system as one parameter;
when the temperature (T 12 ) lies below a temperature threshold value, control heating of the exhaust gas aftertreatment system by a burner ( 16 ) arranged in an exhaust gas line ( 11 ) between a nitrogen storage (NSC) catalyst ( 13 ) and a selective catalytic reduction (SCR) catalyst ( 14 );
determine a nitrogen oxide load (B NOx ) of the nitrogen oxide storage catalyst ( 13 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter; and
when the nitrogen oxide load (B NOx ) exceeds a nitrogen oxide load threshold value, control dispensing of fuel into an exhaust gas line of the internal combustion engine ( 10 ).
10. The electronic controller according to claim 9 , wherein the electronic controller is configured to: determine an ammonia load (B NH3 ) of an SCR catalyst ( 14 ) of the exhaust gas aftertreatment system ( 12 ) as another parameter.
11. The electronic controller according to claim 10 , wherein the electronic controller is configured to: when the ammonia load (B NH3 ) is below an ammonia load threshold value, control dispensing ( 63 ) of ammonia or an ammonia-cleaving reagent into an exhaust gas line ( 11 ) of the internal combustion engine ( 10 ).
12. The electronic controller according to claim 11 , wherein the electronic controller is configured to: check whether the exhaust gas aftertreatment system ( 12 ) is ready to operate, and start the internal combustion engine when the temperature (T 12 ) lies at or above a temperature threshold value, the nitrogen oxide load (B NOx ) is at or below a nitrogen oxide load threshold value, and the ammonia load (B NH3 ) is at or above an ammonia load threshold value.