Method and device for detecting an inverted connection of a crankshaft sensor
AssigneesContinental Automotive France, Continental Automotive GmbH
InventorsStéphane Eloy, Fabien Joseph
Life of this patent
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Abstract
A method for diagnosing an inversion of a crankshaft sensor includes the following steps: acquiring a signal by way of the crankshaft sensor, at each detection of a tooth, determining a tooth time elapsed since the previous tooth detection, at each detection of a tooth, calculating a ratio Ri of the tooth times according to the formula Ri=(Ti−1)2/(Ti*Ti−2), where Ri is the ratio, Ti is the last tooth time, Ti−1 is the penultimate tooth time, and Ti−2 is the tooth time preceding the penultimate tooth time, comparing the ratio Ri with a low threshold Sb, indicative of a turn marker, and a high threshold Sh, indicative of an absence of inversion, a ratio Ri between the two thresholds Sb, Sh being indicative of an inversion.
Claims20
A method for diagnosing an inverted connection of a crankshaft sensor including a toothed wheel rigidly connected to the crankshaft and a magnetic sensing element rigidly connected to a frame, the toothed wheel including teeth regularly spaced at a periphery thereof and a turn marker, the magnetic sensing element configured to detect a presence and/or an absence of matter, the magnetic sensing element disposed in proximity to the periphery of said toothed wheel in order to detect one or more of a presence and an absence of one or more of (i) a tooth of the teeth and (ii) the turn marker, when said toothed wheel moves in front of the magnetic sensing element, the method comprising:
- acquiring a signal by the crankshaft sensor, when the crankshaft rotates in a direction during engine start-up,
- at each detection of one tooth of the teeth,
- determining a tooth time Ti elapsed since a previous tooth detection, and
- calculating a ratio Ri of the tooth times according to the formula Ri=(Ti−1)2 /(Ti*Ti−2), where Ri is the ratio, Ti is the last tooth time, Ti−1 is the penultimate tooth time, and Ti−2 is the tooth time preceding the penultimate tooth time;
- and
- comparing the ratio Ri with a low threshold indicative of the turn marker, and a high threshold indicative of an absence of an inverted connection,
- wherein the ratio Ri being between the two thresholds is indicative of the inverted connection.
A device being configured to diagnose the inverted connection of a crankshaft sensor, the device comprising:
- at least one computer;
- and
- a crankshaft sensor comprising
- a toothed wheel rigidly connected to the crankshaft, the toothed wheel including teeth regularly spaced at the periphery thereof and a turn marker, and
- a magnetic sensing element rigidly connected to a frame, the magnetic sensing element configured to detect a presence and/or an absence of matter, the magnetic sensing element in proximity to the periphery of said toothed wheel, in order to detect the presence and/or the absence of a tooth and/or of the turn marker, when said toothed wheel moves in front of the sensing element,
- wherein the crankshaft sensor is configured to acquire a signal, when the crankshaft rotates in a direction during engine start-up, and
- wherein the computer is configured, at each detection of one tooth of the teeth, to
- determine a tooth time Ti elapsed since a previous tooth detection, and
- calculate a ratio Ri of the tooth times according to the formula Ri=(Ti−1)2 /(Ti*Ti−2), where Ri is the ratio, Ti is the last tooth time, Ti−1 is the penultimate tooth time, and Ti−2 is the tooth time preceding the penultimate tooth time,
- wherein the computer is configured to compare the ratio Ri with a low threshold indicative of the turn marker, and a high threshold indicative of an absence of an inverted connection, and
- wherein the ratio Ri being between the two thresholds is indicative of the inverted connection.
Dependencies are inferred from the claim text.