Exhaust Gas Treatment Apparatus Functionality Check

摘要

An exhaust fluid treatment apparatus used to treat exhaust fluid emitted by a combustion engine includes a check of its functionality. A method of monitoring operation of an exhaust fluid treatment apparatus includes comparing a calculated temperature difference with an expected temperature difference associated with combustion of fuel. If the calculated temperature difference is within an acceptable margin of the expected temperature difference, further fuel injection may be permitted. If the calculated temperature difference is outside the acceptable margin of the expected temperature difference, a temperature of the exhaust gas upstream of the exhaust fluid treatment apparatus may be increased.

主权项

1. A method of monitoring operation of an exhaust fluid treatment apparatus, the apparatus comprising a diesel oxidation catalyst comprising an inlet and an outlet, the method comprising:
receiving an input temperature data value being indicative of temperature of fluid at the inlet; injecting a first quantity of fuel upstream of the diesel oxidation catalyst for combustion in the diesel oxidation catalyst; receiving an output temperature data value being indicative of temperature of fluid at the outlet; calculating a calculated temperature difference between the input temperature data value and the output temperature data value and comparing the calculated temperature difference with an expected temperature difference associated with the quantity of fuel injected; and: if the calculated temperature difference is within an acceptable margin of the expected temperature difference, injecting a second quantity of fuel into the exhaust fluid for combustion in the diesel oxidation catalyst; and if the calculated temperature difference is outside the acceptable margin of the expected temperature difference, raising a temperature of exhaust gas upstream of the inlet to the diesel oxidation catalyst.