Fuel driveability index detection
First Claim
1. A method for fuel driveability index detection, comprising:
- measuring an exhaust gas feedstream of an internal combustion engine with an oxygen sensor;
obtaining a first input signal indicating a first oxygen sensor voltage;
obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal;
determining a first voltage trend based on said first input signal and said second input signal; and
determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate; and
, adjusting open loop fueling if said first voltage trend is decreasing at a rate greater than said first voltage threshold rate;
wherein said adjusting open loop fueling occurs within about five seconds of a cold start of the internal combustion engine.
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Accused Products
Abstract
An exemplary embodiment is a method, system and storage medium for fuel driveability index detection. The system includes an engine and an oxygen sensor disposed within the exhaust gas passage of the engine. An engine control module is operatively connected to the engine. The engine control module has a processor for obtaining a first input signal indicating a first oxygen sensor voltage, obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to the first input signal, determining a first voltage trend based on the first input signal and the second input signal and determining whether the first voltage trend is decreasing at a rate greater than a first voltage threshold rate.
25 Citations
23 Claims
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1. A method for fuel driveability index detection, comprising:
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measuring an exhaust gas feedstream of an internal combustion engine with an oxygen sensor;
obtaining a first input signal indicating a first oxygen sensor voltage;
obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal;
determining a first voltage trend based on said first input signal and said second input signal; and
determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate; and
,adjusting open loop fueling if said first voltage trend is decreasing at a rate greater than said first voltage threshold rate;
wherein said adjusting open loop fueling occurs within about five seconds of a cold start of the internal combustion engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for fuel driveability index detection, the method comprising:
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obtaining a first input signal indicating a first oxygen sensor voltage;
obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal;
determining a first voltage trend based on said first input signal and said second input signal; and
determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate, wherein a software logic flag indicating a high driveability index is set if said first voltage trend is decreasing at a rate greater than said first voltage threshold rate.
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12. A method for fuel driveability index detection, the method comprising:
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obtaining a first input signal indicating a first oxygen sensor voltage;
obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal;
determining a first voltage trend based on said first input signal and said second input signal; and
determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate;
determining whether said first voltage trend is increasing at a rate greater than a second voltage threshold rate if said first voltage trend is not decreasing at a rate greater than said first voltage threshold rate; and
determining whether an engine run timer is less than an engine run timer threshold if said first voltage trend is not increasing at a rate greater than said second voltage threshold rate. - View Dependent Claims (13, 14, 15, 16)
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17. A system for fuel driveability index detection, the system comprising:
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an internal combustion engine;
an oxygen sensor disposed within the exhaust gas passage of said engine;
an engine control module operatively connected to said engine; and
said engine control module having a processor for obtaining a first input signal indicating a first oxygen sensor voltage, obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal, determining a first voltage trend based on said first input signal and said second input signal, determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate, and adjusting open loop fueling if said first voltage trend is decreasing at a rate greater than said first voltage threshold rate, wherein adjusting open loop fueling occurs within about five seconds of a cold start of the internal combustion engine.
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18. A system for fuel driveability index detection, the system comprising:
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an engine;
an oxygen sensor disposed within the exhaust gas passage of said engine;
an engine control module operatively connected to said engine; and
said engine control module having a processor for obtaining a first input signal indicating a first oxygen sensor voltage, obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal, determining a first voltage trend based on said first input signal and said second input signal and determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate, wherein a software logic flag indicating a high driveability index is set if said first voltage trend is decreasing at a rate greater than said first voltage threshold rate.
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19. A system for fuel driveability index detection, the system comprising:
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an engine;
an oxygen sensor disposed within the exhaust gas passage of said engine;
an engine control module operatively connected to said engine; and
said engine control module having a processor for obtaining a first input signal indicating a first oxygen sensor voltage, obtaining a second input signal indicating a second oxygen sensor voltage at a period subsequent to said first input signal, determining a first voltage trend based on said first input signal and said second input signal and determining whether said first voltage trend is decreasing at a rate greater than a first voltage threshold rate further including said processor;
determining whether said first voltage trend is increasing at a rate greater than a second voltage threshold rate if said first voltage trend is not decreasing at a rate greater than said first voltage threshold rate; and
determining whether an engine run timer is less than an engine run timer threshold if said first voltage trend is not increasing at a rate greater than said second voltage threshold rate. - View Dependent Claims (20, 21, 22, 23)
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Specification