Exhaust gas treatment apparatus functionality check
First Claim
1. A method of monitoring and controlling 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 into an exhaust fluid 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
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only 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.
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Accused Products
Abstract
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.
13 Citations
20 Claims
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1. A method of monitoring and controlling operation of an exhaust fluid treatment apparatus, the apparatus comprising a diesel oxidation catalyst comprising an inlet and an outlet, the method comprising:
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receiving an input temperature data value being indicative of temperature of fluid at the inlet; injecting a first quantity of fuel into an exhaust fluid 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
;only 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An exhaust fluid treatment apparatus comprising a diesel oxidation catalyst and a controller, the diesel oxidation catalyst comprising an inlet and an outlet, the controller configured to:
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receive an input temperature data value being indicative of temperature of fluid at the inlet; initiate a first quantity of fuel to be injected into the exhaust fluid for combustion in the diesel oxidation catalyst; receive an output temperature data value being indicative of temperature of fluid at the outlet; calculate 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
;only if the calculated temperature difference is within an acceptable margin of the expected temperature difference, inject 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, raise a temperature of exhaust gas upstream of the inlet to the diesel oxidation catalyst. - View Dependent Claims (19, 20)
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Specification