CPC F01N 3/208 (2013.01) [B01D 53/9418 (2013.01); B60W 10/06 (2013.01); B60W 10/08 (2013.01); B60W 20/16 (2016.01); F01N 3/2013 (2013.01); F01N 3/323 (2013.01); F02D 41/0002 (2013.01); F02D 41/0235 (2013.01); F01N 3/0293 (2013.01); F01N 3/0885 (2013.01); F01N 2250/12 (2013.01); F01N 2570/18 (2013.01); F01N 2610/02 (2013.01); F01N 2610/146 (2013.01); F01N 2610/1453 (2013.01); F01N 2900/04 (2013.01); F01N 2900/10 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/1406 (2013.01); F01N 2900/1602 (2013.01); F01N 2900/1616 (2013.01); F01N 2900/18 (2013.01)] | 14 Claims |
1. A vehicle operating method, comprising:
via a controller, supplying urea to a selective catalytic reduction (SCR) catalyst in response to a vehicle being in an off state and a temperature of the SCR catalyst being within a predetermined temperature range;
increasing a flow through the SCR catalyst in response to the vehicle being in the off state and an estimate of NH3 stored in the SCR catalyst being less than a threshold amount of NH3 where increasing the flow through the SCR catalyst includes rotating the engine via an electric machine.
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11. A vehicle operating method, comprising:
via a controller, adjusting a temperature of a selective catalytic reduction (SCR) catalyst in response to a vehicle being in an off state and the temperature of the SCR catalyst not being within a predetermined temperature range; and
rotating an engine via an electric machine to increase the flow through the SCR catalyst.
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