Enhanced diagnosis of a multi-banked catalyst exhaust system
First Claim
1. A method of diagnosing emissions in a multi-banked emissions system, the method comprising the steps of:
- obtaining a plurality of emissions measurements, wherein each of the measurements corresponds to one bank of the multi-banked emissions system;
converting each of the plurality of measurements to a scaled value as a percentage of a threshold value;
adding the scaled values to obtain a total emission value for the multi-banked emissions system; and
triggering an indication if the total emission value exceeds the threshold value.
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Abstract
Methods and apparatus are provided for diagnosing emissions in a multi-banked catalyst emissions system for a motor vehicle. A method of diagnosing emissions in a multi-banked emissions system suitably includes obtaining an emissions measurement for each bank in the multi-banked emissions system, converting the emissions measurements to scaled values, adding the scaled values to obtain a total emission value, and triggering an indication if the total emission value exceeds a pre-determined maximum. A system for processing emissions from an engine in a motor vehicle typically includes multiple exhaust banks and a processor. Each of the exhaust banks includes a catalytic converter and at least one oxygen sensor. The processor receives measurements from the oxygen sensors, converts the measurements to scaled values as a percentage of a threshold value, computes a total emission value from the scaled values, and triggers an indication if the total emission value exceeds the threshold value.
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Citations
14 Claims
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1. A method of diagnosing emissions in a multi-banked emissions system, the method comprising the steps of:
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obtaining a plurality of emissions measurements, wherein each of the measurements corresponds to one bank of the multi-banked emissions system;
converting each of the plurality of measurements to a scaled value as a percentage of a threshold value;
adding the scaled values to obtain a total emission value for the multi-banked emissions system; and
triggering an indication if the total emission value exceeds the threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of diagnosing emissions in a multi-banked emissions system, the method comprising the steps of:
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obtaining an emissions measurement for each bank in the multi-banked emissions system;
converting each of the emissions measurements to a scaled value;
adding the scaled values to obtain a total emission value; and
triggering an indication if the total emission value exceeds a predetermined maximum. - View Dependent Claims (8, 9, 10)
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11. A system for processing emissions from an engine in a motor vehicle, the system comprising:
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a plurality of exhaust banks, each of the exhaust banks comprising a catalytic converter configured to receive a portion of the exhaust produced by the engine and an oxygen sensor configured to monitor the level of oxygen present in the exhaust bank and to provide a measurement corresponding thereto; and
a processor configured to receive the measurements from the oxygen sensors, to convert the measurements to scaled values as a percentage of a threshold value, to add the scaled values to compute a total emission value for the engine, and to trigger an indication if the total emission value exceeds the threshold value.
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12. A system for processing emissions from an engine and for generating a display to an operator, the system comprising:
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a first exhaust bank coupled to the engine and having a first catalytic converter and a first oxygen sensor;
a second exhaust bank coupled to the engine and having a second catalytic converter and a second oxygen sensor;
a processor operatively coupled to the first and second oxygen sensors and to the display; and
a digital memory in communication with the processor, the memory having instructions executable by the processor stored therein, wherein the instructions comprise;
a first code module comprising instructions configured to obtain a first measurement from the first oxygen sensor and a second measurement from the second oxygen sensor;
a second code module comprising instructions configured to convert the first and second measurements to first and second scaled values;
a third code module comprising instructions configured to compute a total emission value as a function of the first and second scaled values; and
a fourth code module comprising instructions configured to trigger an indication signal to the display if the total emission value exceeds a threshold. - View Dependent Claims (13)
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14. A system for diagnosing emissions in a multi-banked emissions system, the system comprising:
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means for obtaining a plurality of emissions measurements, wherein each of the measurements corresponds to one bank of the multi-banked emissions system;
means for converting each of the plurality of measurements to a scaled value as a percentage of a threshold value;
means for adding the scaled values to obtain a total emission value for the multi-banked emissions system; and
means for triggering an indication if the total emission value exceeds the threshold value.
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Specification