Systems and methods for engine knock sensor rationality check
First Claim
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1. A method, comprising:
- via a controller,responsive to an indication of a knock event from a knock sensor coupled to an engine propelling a vehicle, correlating output of the knock sensor with output of a microphone on-board the vehicle to determine degradation of the knock sensor; and
providing an alert to a vehicle operator responsive to determining degradation of the knock sensor.
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Abstract
Methods and systems are provided for rationalizing an engine knock sensor. In one example, a method may include, responsive to an indication of an engine knock event, correlating an output of the engine knock sensor with an output of an on-board microphone to determine degradation of the engine knock sensor. By rationalizing the engine knock sensor against another on-board sensor (e.g., the on-board microphone), diagnostic fidelity may be increased.
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Citations
20 Claims
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1. A method, comprising:
via a controller, responsive to an indication of a knock event from a knock sensor coupled to an engine propelling a vehicle, correlating output of the knock sensor with output of a microphone on-board the vehicle to determine degradation of the knock sensor; and providing an alert to a vehicle operator responsive to determining degradation of the knock sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for a spark ignition engine, comprising:
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via a controller, adjusting a spark timing responsive to each of an output of a knock sensor coupled to the engine and an output of a microphone configured to measure sound produced by the engine, wherein the output of the microphone is used to determine a condition of the knock sensor. - View Dependent Claims (13, 14, 15, 16)
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17. A vehicle system, comprising:
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an engine including a plurality of cylinders, each cylinder including a spark plug coupled thereto; a knock sensor coupled to the engine; a microphone coupled in the vehicle; a controller holding instructions in non-transitory memory that, when executed, cause the controller to; determine a condition of the knock sensor based on an output of the knock sensor and an output of the microphone obtained during a detection of knock by the knock sensor; adjust a timing of a spark provided by the spark plug during a subsequent detection of knock by the knock sensor based on the determined condition. - View Dependent Claims (18, 19, 20)
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Specification