Device for detecting the reverse rotation of a rotating part of an internal combustion engine
First Claim
1. A device for detecting the reverse rotation of a rotating part of an internal combustion engine, comprising a crankshaft (3), a sensor (6), and a detector disk (2), wherein said detector disk (2) is connected to the crankshaft (3) and has a reference mark (5) and a multitude of similar angle marks (4), wherein rotations of said crankshaft are sent by the sensor (6) to a control unit (1) in the form of pulses, further comprising a camshaft (7) and an absolute angle detector (8), wherein rotation of said camshaft (7) is detected by means of the absolute angle detector (8), wherein an output signal of the absolute angle detector (8) within a period of 360°
- of camshaft rotation or 720°
of crankshaft rotation steadily falls with reverse rotation, φ
(k)<
φ
(k−
1)<
φ
(k−
2), depending on the rotation direction, and wherein the output signal of the absolute angle detector (8) is supplied to the control unit (1) for processing, wherein in order to detect reverse rotations of the internal combustion engine, three successive angle values φ
(k), φ
(k−
1), φ
(k−
2) are scanned from the output signal of the absolute angle detector (8) and are compared to one another in an algorithm in such a way that in the event of inverse operation with reverse rotations, the equation φ
(k)<
φ
(k−
1)<
φ
(k−
2) is true, and wherein when this condition is not fulfilled, no conclusion is drawn regarding reverse rotations.
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Accused Products
Abstract
The invention relates to a device for detecting the reverse rotation of a rotating part of an internal combustion engine, having a crankshaft (3) whose rotation, by means of a sensor (6) and a detector disk (2) which is connected to the crankshaft (3) and has a reference mark (5) and a multitude of similar angle marks (4), are sent by the sensor (6) to a control unit (1) in the form of pulses, having a camshaft (7) whose rotation is detected by means of an absolute angle detector (8), wherein the output signal of the absolute angle detector (8) steadily rises or falls within a period depending on the rotation direction of the camshaft 7. The output signal of the absolute angle detector (8) is supplied to the control unit (1) for processing. In order to detect reverse rotation of the internal combustion engine, three successive angle values φ(k−2), φ(k−1), φ(k), are scanned from the output signal of the absolute angle detector (8) and are compared to one another in an algorithm in such a way that in the event of a malfunction with reverse rotation, the equation: φ(k)<φ(k−1)<φ(k−2) is true. If this condition is not fulfilled, no conclusion is drawn regarding reverse rotation.
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Citations
7 Claims
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1. A device for detecting the reverse rotation of a rotating part of an internal combustion engine, comprising a crankshaft (3), a sensor (6), and a detector disk (2), wherein said detector disk (2) is connected to the crankshaft (3) and has a reference mark (5) and a multitude of similar angle marks (4), wherein rotations of said crankshaft are sent by the sensor (6) to a control unit (1) in the form of pulses, further comprising a camshaft (7) and an absolute angle detector (8), wherein rotation of said camshaft (7) is detected by means of the absolute angle detector (8), wherein an output signal of the absolute angle detector (8) within a period of 360°
- of camshaft rotation or 720°
of crankshaft rotation steadily falls with reverse rotation, φ
(k)<
φ
(k−
1)<
φ
(k−
2), depending on the rotation direction, and wherein the output signal of the absolute angle detector (8) is supplied to the control unit (1) for processing, wherein in order to detect reverse rotations of the internal combustion engine, three successive angle values φ
(k), φ
(k−
1), φ
(k−
2) are scanned from the output signal of the absolute angle detector (8) and are compared to one another in an algorithm in such a way that in the event of inverse operation with reverse rotations, the equation φ
(k)<
φ
(k−
1)<
φ
(k−
2) is true, and wherein when this condition is not fulfilled, no conclusion is drawn regarding reverse rotations. - View Dependent Claims (2, 3, 4, 5, 6)
- of camshaft rotation or 720°
-
7. A device for detecting the reverse rotation of a rotating part of an internal combustion engine, comprising a crankshaft (3), a sensor (6), and a detector disk (2), wherein said detector disk (2) is connected to the crankshaft (3) and has a reference mark (5) and a multitude of similar angle marks (4), wherein rotations of said crankshaft are sent by the sensor (6) to a control unit (1) in the form of pulses, further comprising a camshaft (7) and an absolute angle detector (8), wherein rotation of said camshaft (7) is detected by means of the absolute angle detector (8), wherein, in normal forward rotation, a steadily falling output signal is produced by the absolute angle detector, and wherein the output signal of the absolute angle detector (8) within a period of 360°
- of camshaft rotation or 720°
of crankshaft rotation steadily rises with reverse rotation, φ
(k)>
φ
(k−
1)>
φ
(k−
2), depending on the rotation direction, and wherein the output signal of the absolute angle detector (8) is supplied to the control unit (1) for processing, wherein in order to detect reverse rotations of the internal combustion engine, three successive angle values φ
(k), φ
(k−
1), φ
(k−
2) are scanned from the output signal of the absolute angle detector (8) and are compared to one another in an algorithm in such a way that in the event of inverse operation with reverse rotations, the equation φ
(k)>
φ
(k−
1)>
φ
(k−
2), is true, and wherein when this condition is not fulfilled, no conclusion is drawn regarding reverse rotations.
- of camshaft rotation or 720°
Specification