On board diagnostic monitor of NOx conversion efficiency for aftertreatment device
First Claim
1. Method for indicating a malfunctioning catalyst in a powertrain including an internal combustion engine and an aftertreatment system comprising an aftertreatment device utilizing a catalyst to convert NOx, the method comprising:
- monitoring a NOx content entering the aftertreatment system;
monitoring a NOx content exiting the aftertreatment system;
determining an actual conversion efficiency based upon the NOx content entering the aftertreatment system and the NOx content exiting the aftertreatment system;
monitoring factors affecting conversion efficiency within the aftertreatment device;
determining a malfunction conversion efficiency indicative of the malfunctioning catalyst based upon the factors affecting conversion efficiency within the aftertreatment device; and
indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the malfunction conversion efficiency.
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Accused Products
Abstract
A method for indicating a malfunctioning catalyst in a powertrain including an internal combustion engine and an aftertreatment system including an aftertreatment device utilizing a catalyst to convert NOx includes monitoring a NOx content entering the aftertreatment system, monitoring a NOx content exiting the aftertreatment system, determining an actual conversion efficiency based upon the NOx content entering the aftertreatment system and the NOx content exiting the aftertreatment system, monitoring factors affecting conversion efficiency within the aftertreatment device, determining a malfunction conversion efficiency indicative of the malfunctioning catalyst based upon the factors affecting conversion efficiency within the aftertreatment device, and indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the malfunction conversion efficiency.
35 Citations
20 Claims
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1. Method for indicating a malfunctioning catalyst in a powertrain including an internal combustion engine and an aftertreatment system comprising an aftertreatment device utilizing a catalyst to convert NOx, the method comprising:
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monitoring a NOx content entering the aftertreatment system; monitoring a NOx content exiting the aftertreatment system; determining an actual conversion efficiency based upon the NOx content entering the aftertreatment system and the NOx content exiting the aftertreatment system; monitoring factors affecting conversion efficiency within the aftertreatment device; determining a malfunction conversion efficiency indicative of the malfunctioning catalyst based upon the factors affecting conversion efficiency within the aftertreatment device; and indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the malfunction conversion efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. Method for indicating a selective catalytic reduction device with a malfunctioning catalyst in an aftertreatment system of a powertrain, the catalyst treating NOx with an ammonia reactant, the method comprising:
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monitoring a NOx content entering the aftertreatment system; monitoring a NOx content exiting the aftertreatment system; determining an actual conversion efficiency of the catalyst based upon the NOx content entering the aftertreatment system and the NOx content exiting the aftertreatment system; monitoring a bed temperature within the selective catalytic reduction device; monitoring a space velocity within the selective catalytic reduction device; monitoring an amount of ammonia storage within the selective catalytic reduction device; determining a predicted nominal conversion efficiency of the catalyst based upon the bed temperature, the space velocity, and the amount of ammonia storage; determining a drop in conversion efficiency of the catalyst from the predicted nominal conversion efficiency indicative of the malfunctioning catalyst based upon the bed temperature, the space velocity, and the amount of ammonia storage; indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the predicted nominal conversion efficiency minus the drop in conversion efficiency; and generating an alert based upon the indicating.
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19. System for indicating a malfunctioning catalyst in a, powertrain including an internal combustion engine and an aftertreatment system comprising an aftertreatment device utilizing a catalyst to convert NOx, the system comprising:
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the aftertreatment device comprising the catalyst; a control module monitoring a NOx content entering the aftertreatment system, monitoring a NOx content exiting the aftertreatment system, determining an actual conversion efficiency based upon the NOx content entering the aftertreatment system and the NOx content exiting the aftertreatment system, monitoring factors affecting conversion efficiency of the aftertreatment device, determining a malfunction conversion efficiency indicative of the malfunctioning catalyst based upon the factors affecting conversion efficiency of the aftertreatment device, and generating a signal indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the malfunction conversion efficiency.
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20. System for indicating a malfunctioning catalyst in a selective catalytic reduction device in an aftertreatment system, the catalyst treating NOx with an ammonia reactant, the system comprising:
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the selective catalytic reduction device comprising the catalyst; a control module monitoring an actual conversion efficiency of the selective catalytic reduction device, monitoring factors affecting conversion efficiency of the selective catalytic reduction device, comprising; monitoring a bed temperature within the selective catalytic reduction device, monitoring a space velocity within the selective catalytic reduction device, and monitoring an amount of ammonia storage within the selective catalytic reduction device; determining a malfunction conversion efficiency indicative of the malfunctioning catalyst based upon the factors affecting conversion efficiency of the selective catalytic reduction device, and generating a signal indicating the malfunctioning catalyst based upon comparing the actual conversion efficiency to the malfunction conversion efficiency.
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Specification