Method of preventing preignition for an internal combustion engine
AssigneeGeneral Motors Corporation
InventorsRonald M. Wozniak, John S. Jackson
Life of this patent
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Abstract
Preignition in an engine is prevented by identifying engine conditions that relate to autoignition. If one or more of the engine conditions exceed a threshold, a controller retards the spark in the engine. The controller detects whether autoignition occurs in the engine due to the retarded spark advance. If autoignition is detected, the controller corrects the one or more engine conditions by at least one of reducing a throttle opening, cutting of fuel to a cylinder, adjusting a camshaft phase, and storing a diagnostic code.
Claims23
A method for preventing preignition in a spark ignition engine comprising:
- identifying at least one engine condition that relates to autoignition in the engine;
- retarding spark in the engine if the engine condition exceeds a threshold;
- detecting whether autoignition occurs in the engine due to the retarded spark advance;
- and
- correcting the engine condition by at least one of reducing a throttle opening, cutting off fuel to a cylinder, adjusting a camshaft phase, and storing a diagnostic code if autoignition is detected.
A method for preventing preignition in a spark ignition engine comprising:
- identifying a plurality of engine conditions that relates to autoignition in the engine;
- retarding spark in the engine if the plurality of engine conditions exceeds corresponding thresholds;
- detecting whether autoignition occurs in the engine due to the retarded spark advance;
- and
- correcting the plurality of engine conditions by at least one of reducing a throttle opening, cutting off fuel to a cylinder, adjusting a camshaft phase, and storing a diagnostic code if autoignition is detected.
An engine preignition prevention system comprising:
- at least one sensor that identifies at least one engine condition that relates to autoignition;
- a controller that retards spark in the engine if at least one engine condition exceeds a threshold and that detects whether autoignition occurs in the engine due to the retarded spark advance;
- and
- wherein the controller communicates with the at least one sensor corrects the engine condition by at least one of reducing a throttle opening, cutting off fuel to a cylinder, adjusting a camshaft phase, and storing a diagnostic code if autoignition is detected.
Dependencies are inferred from the claim text.