Rotary detection device and method for determining rotating body reference clearance

Abstract

PROBLEM TO BE SOLVED: To accurately determine whether a tooth-missing section is passed even when a double signal abnormality is generated. SOLUTION: A crank position sensor 42 includes a main sensor 61 and a sub-sensor 62 for outputting pulse signals each time a tooth 52 of a signal rotor 51 passes, where the signals output by the sensors have phases deviating from each other. When such conditions that a sub-signal of the sub-sensor 62 is at a high level and that a main signal of the main sensor 61 is changed are established, the crank position sensor 42 outputs a crank signal whose pulse width is different according to a changing direction of the main signal when the conditions are established. An ECU 41 performs tooth-missing section passage determination based on a time interval between the crank signals. Also, the ECU 41 determines whether or not a double signal abnormality where two signals are output from the crank position sensor 42 each time the tooth 52 passes is generated, and changes determination configurations of the tooth-missing section passage determination according to the cases in which the double signal abnormality is determined to be present and absent, upon performing the tooth-missing passage determination.

Description

technical field [0001] The invention relates to a rotation detection device and a method for judging a reference gap of a rotating body. The rotation detection device includes a rotation sensor for detecting forward rotation and reverse rotation of the rotating body. Background technique [0002] In a conventional rotation detection device such as that described in Japanese Patent Application Publication No. 2005-233622 (JP-A-2005-233622), a disc-shaped signal rotor is coupled to a crankshaft which serves as an output of an internal combustion engine shaft, and the crank position sensor is arranged towards the signal rotor. A plurality of teeth are formed at prescribed angular intervals (for example, 10 degrees) along the outer circumference of the signal rotor, and a reference gap is formed as an area on the circumference of the rotor in which the interval between adjacent teeth is the same as that of other adjacent teeth. The spacing between the teeth is different. [00...

AI Technical Summary

Problems solved by technology

Therefore, when a double-signal failure occurs, the pulse signal output from the crank position sensor cannot be used to accurately determine whether the reference gap has passed based on the time interval between the pulse signals

[0008] In addition, the problem is not limited to the crank position sensor that outputs a pulse signal whose pulse width varies depending on the rotation direction of the crankshaft, but also occurs in other types of crank position sensors that differ in the output method (for example, the number of signal outputs) etc.

In addition, the above-mentioned problem may occur not only in the crank position sensor for detecting the rotation of the crankshaft of the internal combustion engine, but also in any type of rotation sensor for detecting the rotation of the rotor

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