COLD-START ENGINE LOADING FOR ACCELERATED WARMING OF EXHAUST AFTERTREATMENT SYSTEM
First Claim
11. A method for accelerated warming of an exhaust aftertreatment system having a catalytic converter device with a catalyst for the reduction and oxidation of emissions generated by an internal combustion engine in a motorized vehicle, the method comprising:
- establishing a target minimum catalyst temperature;
monitoring a current catalyst temperature;
determining whether the current catalyst temperature is less than the target minimum catalyst temperature;
calculating a minimum engine load required to increase the current catalyst temperature to the target minimum catalyst temperature;
calculating a minimum alternator load required to induce the minimum engine load;
increasing a current engine load to equal the minimum engine load if the current catalyst temperature is less than the target minimum catalyst temperature;
wherein increasing the current engine load includes activating a reducing agent tank heating device and a reducing agent line heating device, and commanding the reducing agent tank heating device and reducing agent line heating device to generate the minimum alternator load.
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Abstract
The methods of the present invention are adapted to adjust engine loading during catalyst warm up to accelerate heating of the exhaust aftertreatment system and thereby decrease catalyst light-off times. According to a preferred embodiment of the present invention, the method includes: monitoring the current catalyst temperature; determining if the current catalyst temperature is less than a predetermined minimum catalyst temperature; and, if the current catalyst temperature is less than the predetermined minimum catalyst temperature, increasing the current engine load. The current engine load is increased by activating a reducing agent tank heating device and/or a reducing agent line heating device.
40 Citations
14 Claims
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11. A method for accelerated warming of an exhaust aftertreatment system having a catalytic converter device with a catalyst for the reduction and oxidation of emissions generated by an internal combustion engine in a motorized vehicle, the method comprising:
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establishing a target minimum catalyst temperature; monitoring a current catalyst temperature; determining whether the current catalyst temperature is less than the target minimum catalyst temperature; calculating a minimum engine load required to increase the current catalyst temperature to the target minimum catalyst temperature; calculating a minimum alternator load required to induce the minimum engine load; increasing a current engine load to equal the minimum engine load if the current catalyst temperature is less than the target minimum catalyst temperature; wherein increasing the current engine load includes activating a reducing agent tank heating device and a reducing agent line heating device, and commanding the reducing agent tank heating device and reducing agent line heating device to generate the minimum alternator load. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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13-1. The method of claim 11, wherein increasing the current engine load further includes adjusting activation of the reducing agent tank heating device and reducing agent line heating device in response to variations in vehicle operating conditions.
Specification