Virtual fuel quality sensor
First Claim
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1. A method of operating a multiple combustion chamber internal combustion engine comprising:
- advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing;
determining a first knock margin of the first subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event;
advancing the ignition timing in a second subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing;
determining a second knock margin of the second subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event; and
determining a characteristic of a fuel supplied to the combustion chambers in relation to the first and second knock margins.
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Abstract
A method of operating a multiple combustion chamber internal combustion engine includes advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing. A first knock margin of the first subset of combustion chambers is determined in relation to a difference between the operating ignition timing and the ignition timing at the knock event. A characteristic of a fuel supplied to the combustion chambers is determined in relation to at least the first knock margin.
52 Citations
20 Claims
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1. A method of operating a multiple combustion chamber internal combustion engine comprising:
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advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing; determining a first knock margin of the first subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event; advancing the ignition timing in a second subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing; determining a second knock margin of the second subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event; and determining a characteristic of a fuel supplied to the combustion chambers in relation to the first and second knock margins. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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(i) advancing an ignition timing of one combustion chamber of a multiple combustion chamber engine from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing; (ii) determining a knock margin of the one combustion chamber; (iii) repeating operations (i) and (ii) for subsequent of the combustion chambers until a knock margin has been determined for a plurality of the combustion chambers; and (iv) determining a characteristic of the fuel supplied to the combustion chambers in relation to the determined knock margins. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A system for operating a multiple combustion chamber internal combustion engine, comprising a processor configured to perform operations comprising:
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advancing an ignition timing of a first subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing; determining a first knock margin of the first subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event; advancing the ignition timing in a second subset of the combustion chambers from an operating ignition timing until a knock event is detected while concurrently operating the remaining combustion chambers at the operating ignition timing; determining a second knock margin of the second subset of combustion chambers in relation to a difference between the operating ignition timing and the ignition timing at the knock event; and determining a characteristic of a fuel supplied to the combustion chambers in relation to the first and second knock margins. - View Dependent Claims (19, 20)
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Specification