Fault identification diagnostic for intake system sensors
First Claim
1. A fault identification system for intake system sensors, comprising:
- a throttle position sensor (TPS);
a manifold absolute pressure (MAP) sensor;
a mass airflow (MAF) sensor; and
a diagnostic controller that is coupled to said TPS, said MAP sensor and said MAF sensor, that implements a throttle model, a first intake model and a second intake model, and that identifies a fault in one of said TPS, said MAP sensor and said MAF sensor.
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Abstract
A fault identification system for intake system sensors according to the invention includes a throttle position sensor (TPS), a manifold absolute pressure (MAP) sensor, and a mass airflow (MAF) sensor. A diagnostic controller is coupled to the TPS, the MAP sensor and the MAF sensor. The diagnostic controller implements a throttle model, a first intake model and a second intake model and correctly identifies faults in the TPS, the MAP sensor and the MAF sensor. The throttle model generates a mass airflow estimate. The first intake model generates a first MAP estimate. The second intake model generates a second MAP estimate. The diagnostic controller applies residual calculations on outputs of the throttle model, the first intake model and the second intake model. The diagnostic controller applies a first order lag filter on the residual calculations. The diagnostic controller accesses a truth table to identify faults in the TPS, the MAP sensor and the MAF sensor.
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Citations
18 Claims
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1. A fault identification system for intake system sensors, comprising:
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a throttle position sensor (TPS);
a manifold absolute pressure (MAP) sensor;
a mass airflow (MAF) sensor; and
a diagnostic controller that is coupled to said TPS, said MAP sensor and said MAF sensor, that implements a throttle model, a first intake model and a second intake model, and that identifies a fault in one of said TPS, said MAP sensor and said MAF sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fault identification method for intake system sensors, comprising the steps of:
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generating a mass airflow estimate using a throttle model;
generating a first manifold absolute pressure (MAP) estimate using a first intake model;
generating a second MAP estimate using a second intake model; and
identifying faults in one of a throttle position sensor (TPS), a mass airflow (MAF) sensor and a manifold absolute pressure (MAP) sensor using said MAF estimate, said first MAP estimate and said second MAP estimate. - View Dependent Claims (9, 10, 11)
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12. A fault identification system for intake system sensors, comprising:
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a throttle position sensor (TPS);
a manifold absolute pressure (MAP) sensor;
a mass airflow (MAF) sensor;
a diagnostic controller that is coupled to said TPS, said MAP sensor, and said MAF sensor, that includes a throttle module, a first intake module, a second intake module and a filter module, and that identifies a fault in one of said TPS, said MAP sensor and said MAF sensor. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification