| CPC F01N 3/208 (2013.01) [B01D 53/9418 (2013.01); B01D 53/9495 (2013.01); B01D 2251/2067 (2013.01); B01D 2257/404 (2013.01); F01N 2610/146 (2013.01); F01N 2900/0408 (2013.01); F01N 2900/1402 (2013.01); F01N 2900/16 (2013.01)] | 13 Claims |
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1. A method of operating a reducing agent injector, the reducing agent injector being configured to inject a reducing agent into a catalytic reduction arrangement arranged in downstream fluid communication with an internal combustion engine of a vehicle at a pre-set mass flow rate obtained by a predefined injection model,
the method comprising:
determining a reference level of toxic substances exhausted from the catalytic reduction arrangement when injecting reducing agent at the pre-set mass flow rate;
controlling the reducing agent injector to inject reducing agent at a first mass flow rate, the first mass flow rate being an increased mass flow rate compared to the pre-set mass flow rate;
determining a first level of toxic substances exhausted from the catalytic reduction arrangement after injecting reducing agent at the first mass flow rate;
controlling the reducing agent injector to inject reducing agent at a second mass flow rate, the second mass flow rate being a decreased mass flow rate compared to the pre-set mass flow rate;
determining a second level of toxic substances exhausted from the catalytic reduction arrangement after injecting reducing agent at the second mass flow rate;
determining which one of the reference level of toxic substances, the first level of toxic substances and the second level of toxic substances being a lowest level of toxic substances;
updating the pre-set mass flow rate of the predefined injection model to an updated pre-set mass flow rate as the mass flow rate causing the catalytic reduction arrangement to exhaust the lowest level of toxic substances; and
controlling the reducing agent injector to inject reducing agent at the updated pre-set mass flow rate.
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