Misfire detecting system for engine
AssigneeMazda Motor Corporation
InventorsAkio Saiki, Kenichi Ogasawara
Life of this patent
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Abstract
A misfire detecting system for an engine of a vehicle that detects a misfire of the engine is provided, which includes a processor. The processor determines whether a misfire has occurred by examining whether a fluctuation of a crank angle of the engine is equal to or greater than a determination reference value, acquires a value relating to a density of intake air introduced into the engine, and adjusts the determination reference value according to the value related to the density.
Claims9
A misfire detecting system for an engine of a vehicle that detects a misfire of the engine, the misfire detecting system comprising:
- a crank angle sensor configured to detect a crank angle of a crank shaft of the engine;
- an intake air temperature sensor configured to detect a temperature of an intake air;
- and
- a processor operatively coupled to the crank angle sensor and the intake air temperature sensor and configured to:
- calculate a crank angular acceleration fluctuation based on the crank angle detected by the crank angle sensor;
- determine whether a misfire has occurred by examining whether the crank angular acceleration fluctuation is equal to or greater than a determination reference value, wherein
- the determination reference value is set to a first value when the detected temperature of the intake air is a first temperature;
- the first value is higher than a second value that is set when the detected temperature is a second temperature, which is higher than the first temperature so as to prevent a false determination of the misfire;
- and
- the processor outputs an indication to alert an abnormality relating to the misfire of the engine, when the misfire is determined.
A misfire detecting system for an engine of a vehicle that detects a misfire of the engine, the misfire detecting system comprising:
- a crank angle sensor configured to detect a crank angle of a crank shaft of the engine;
- and a processor operatively coupled to the crank angle sensor and configured to:
- obtain a temperature of an intake air;
- calculate a crank angular acceleration fluctuation based on the crank angle detected by the crank angle sensor;
- determine whether a misfire has occurred by examining whether the crank angular acceleration fluctuation is equal to or greater than a determination reference value, wherein
- the determination reference value is set to a first value when the obtained temperature of the intake air is a first temperature;
- the first value is higher than a second value that is set when the obtained temperature is a second temperature, which is higher than the first temperature so as to prevent a false determination of the misfire;
- and
- the processor outputs an indication to alert an abnormality relating to the misfire of the engine, when the misfire is determined.
Dependencies are inferred from the claim text.