Method and apparatus for detecting a malfunction in an intake pressure sensor of an engine
First Claim
1. An apparatus for detecting a malfunction in an intake pressure sensor of an engine, comprising:
- first detecting means for detecting a flow rate of intake air of the engine;
second detecting means for detecting a speed of the engine;
intake pressure estimating means for determining an intake-air specific flow rate from said intake-air flow rate and said engine speed, said intake-air specific flow rate indicating a calculated value of a mass flow rate of intake air per one revolution of the engine, and for determining an estimated value of intake manifold pressure from said calculated value based upon a stored correlation between the intake-air specific flow rate and the intake manifold pressure; and
malfunction determining means for detecting whether a malfunction in the intake pressure sensor has occurred by comparing a measured value of the intake manifold pressure output by the intake pressure sensor with said estimated value.
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Abstract
An apparatus for detecting a malfunction in an intake pressure sensor of an engine includes a first detecting unit which detects a flow rate of intake air of the engine. A second detecting unit detects an engine speed of the engine. An intake pressure estimating unit determines an intake-air specific flow rate from the intake-air flow rate and the engine speed and determines characteristic values for the intake-air specific flow rate, the characteristic values being representative of an allowable range of intake pressure of the engine for the intake-air specific flow rate. A malfunction determining unit detects whether a malfunction in the intake pressure sensor has occurred, by comparing a signal output by the intake pressure sensor with the characteristic values determined by the intake pressure estimating unit.
70 Citations
14 Claims
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1. An apparatus for detecting a malfunction in an intake pressure sensor of an engine, comprising:
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first detecting means for detecting a flow rate of intake air of the engine; second detecting means for detecting a speed of the engine; intake pressure estimating means for determining an intake-air specific flow rate from said intake-air flow rate and said engine speed, said intake-air specific flow rate indicating a calculated value of a mass flow rate of intake air per one revolution of the engine, and for determining an estimated value of intake manifold pressure from said calculated value based upon a stored correlation between the intake-air specific flow rate and the intake manifold pressure; and malfunction determining means for detecting whether a malfunction in the intake pressure sensor has occurred by comparing a measured value of the intake manifold pressure output by the intake pressure sensor with said estimated value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting a malfunction in an intake pressure sensor of an engine, comprising the steps of:
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detecting a specific flow rate of intake air of the engine; detecting a of the engine; determining an intake-air specific flow rate from said intake-air flow rate and said engine speed, said intake-air specific flow rate indicating a calculated value of a mass flow rate of intake air per one revolution of the engine; determining an estimated value of intake manifold pressure from said calculated value based on a stored correlation between the intake-air specific flow rate and the intake manifold pressure; and making a determination as to whether a malfunction in the intake pressure sensor has occurred by comparing a measured value of intake manifold pressure output from the intake pressure sensor with said estimated value. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification