JP4543991B2 - Rotation angle detection device and internal combustion engine operation control device - Google Patents

Description

  The present invention relates to a rotation angle detection device that detects a rotation angle of a detection target such as a crankshaft of an internal combustion engine and an operation control device for the internal combustion engine.

  As a rotation angle detection device, a rotating body of a magnetic body having unevenness, a magnetoelectric conversion element that outputs an electric signal corresponding to the magnetic strength, and a permanent magnet that generates a magnetic field, and the position of the unevenness of the rotating body are rectangular A device that generates a wave electrical signal and detects the rotation angle of a rotating body based on a rising or falling signal of a rectangular wave is known (Patent Document 1). In addition, there is Patent Document 2 as a prior art document related to the present invention.

JP-A-10-103145 JP 7-174773 A

  In the rotation angle detection device of Patent Document 1, since mechanical errors such as unevenness of the rotating body are not taken into consideration, between the rotation angle detected based on the rising signal and the rotation angle detected based on the falling signal. There may be a difference in accuracy. However, this apparatus does not take measures against such a difference in accuracy, and therefore, when the rotation signal having the poor accuracy of the rising signal or the falling signal is used as a reference for detecting the rotation angle, there is an influence due to the mechanical error. May grow.

  Therefore, an object of the present invention is to provide a rotation angle detection device and an operation control device for an internal combustion engine that can reduce the influence of a mechanical error of a rotating body.

  A first rotation angle detection device of the present invention includes a rotating body attached to a detection target and having a plurality of detection units provided along the rotation direction, and a front of the rotation body of each detection unit in the rotation direction. Edge detection means capable of detecting each of the front edge and the rear edge behind the rotation direction, and the detected edge is based on either the front edge or the rear edge detected by the edge detection means. A rotation angle detection device for detecting a rotation angle of a detection target, wherein an angle between adjacent detection parts among the plurality of detection parts is calculated based on each of the front edge and the rear edge. Possible angle calculation means, error calculation means for calculating an error of the angle calculated by the angle calculation means with respect to a predetermined reference value, and the error in the angle calculated based on the front edge. And the error in the angle calculated based on the rear edge, and based on the comparison result, either the front edge or the rear edge is rotated with respect to the detected object. The above-described problem is solved by providing reference setting means for setting as a reference for detecting the angle (claim 1).

  According to the first rotation angle detection device, each error of the angle between the detected parts calculated based on the front edge and the angle between the detected parts calculated based on the rear edge is calculated, Based on the result of comparing these errors, either the front edge or the rear edge is set as a reference for detecting the rotation angle of the detection target. Therefore, since it is possible to select a more accurate edge as a reference for detecting the rotation angle among the front edge and the rear edge, the mechanical error of the rotating body is detected in detecting the rotation angle of the detection target. It becomes possible to reduce the influence of.

  In the first rotation angle detection device, the errors may be compared so that an edge that is less affected by the mechanical error of the rotating body is selected from the front edge or the rear edge. For example, as one aspect thereof, the reference setting unit may include a maximum error in the angle calculated based on the front edge and a maximum error among the respective errors between adjacent detection units calculated by the error calculation unit. The maximum error at the angle calculated based on the rear edge may be specified, and the one of the front edge or the rear edge with the specified maximum error being smaller may be set as the reference ( Claim 2).

  In addition, the second rotation angle detection device of the present invention includes a rotating body attached to a detection target and having a plurality of detected portions provided along a rotation direction, and rotation of the rotating body of each detected portion. Edge detection means capable of detecting each of a front edge in the front direction and a rear edge in the rear direction of rotation, and based on either the front edge or the rear edge detected by the edge detection means A rotation angle detection device for detecting a rotation angle of the detection target, wherein an angle between detection units adjacent to each other among the plurality of detection units is based on each of the front edge and the rear edge. An angle calculation unit that can be calculated in an error, an error calculation unit that calculates an error of the angle calculated by the angle calculation unit with respect to a predetermined reference value, and the front edge or the rear calculated by the error calculation unit If the error for any one of the edges exceeds an allowable range, a reference setting means for setting either the front edge or the rear edge as a reference for detecting the rotation angle of the detection target; By solving this problem, the above-mentioned problem is solved.

  According to the second rotation angle detection device, when the error when one of the front edge and the rear edge is used as a reference exceeds the allowable range, the other is set as the reference. Therefore, either the front edge or the rear edge can be made to function as a backup for the other. As a result, when the accuracy of one edge deteriorates due to, for example, aging of the rotating body, it is possible to switch to the other edge, so that the influence of the mechanical error of the rotating body that has occurred later is minimized. can do.

  The internal combustion engine operation control apparatus according to the present invention includes a rotating body attached to a crankshaft of the internal combustion engine and provided with a plurality of detected portions along a rotation direction, and the rotating body of each detected portion. Edge detection means capable of detecting each of a front edge in the front direction of rotation and a rear edge behind the rotation direction, and detecting the rotation angle of the crankshaft based on the detection result of the edge detection means, and according to the detection result An internal combustion engine operation control device comprising: a processing execution unit configured to perform predetermined processing, wherein, among the plurality of detected parts, an angle between the detected parts adjacent to each other is determined by the front edge and the Angle calculating means that can be calculated based on each of the rear edges, and error calculating means that calculates an error of the angle calculated by the angle calculating means with respect to a predetermined reference value. The process execution means compares the error in the angle calculated based on the front edge with the error in the angle calculated based on the rear edge, and based on the comparison result, compares the error in the angle The above-described problem is solved by detecting the rotation angle of the crankshaft on the basis of either the edge or the rear edge (claim 4).

  According to this operation control device, the error calculated for each of the front edge and the rear edge of the detected part is compared, and the crankshaft is based on either the front edge or the rear edge based on the comparison result. Is detected. Since the predetermined process is executed by the process execution unit in accordance with the detection result, the accuracy of the predetermined process, for example, the misfire detection process of the internal combustion engine, can be improved.

  As described above, according to the present invention, the angle between adjacent detected parts is calculated for each of the front edge and the rear edge, and an error related to the angle is compared for the front edge and the rear edge. Either the front edge or the rear edge is set as a reference for detecting the rotation angle. Alternatively, when the error relating to either the front edge or the rear edge exceeds the allowable range, the other edge is set as a reference for detecting the rotation angle. For this reason, when detecting the rotation angle of the detection target, the influence of the mechanical error of the rotating body can be reduced.

(First embodiment)
FIG. 1 shows a main part of an embodiment in which a rotation angle detection device and an operation control device of the present invention are applied to an internal combustion engine. The internal combustion engine 1 is an in-line four-cylinder reciprocating gasoline engine, and includes four cylinders 2,. . , 2, a cylinder head 4 having an intake port 4 a and an exhaust port 4 b, and a crankcase 5. Each cylinder 2 accommodates a piston 6. The piston 6 is connected to the crankshaft 8 via a connecting rod 7. The intake port 4a is connected to the intake pipe 9, and the exhaust port 4b is connected to the exhaust pipe 10. The intake pipe 9 is provided with a throttle valve 11 that adjusts the flow rate of air that has passed through an air filter (not shown). The cylinder head 4 is provided with an intake valve 12 that opens and closes the intake port 4a and an exhaust valve 13 that opens and closes the exhaust port 4b. The operating state of the internal combustion engine 1 is controlled by an engine control unit (ECU) 14 that controls each part of the internal combustion engine 1 based on output signals of various sensors. The ECU 14 includes devices such as a CPU, a ROM, and a RAM.

  The internal combustion engine 1 is provided with a rotation angle detection device 20 for detecting the rotation angle (position) of the crankshaft 8 to be detected. The rotation angle detection device 20 is mounted coaxially with the crankshaft 8 and is opposed to the toothed portion 21a and a metal timing rotor (rotating body) 21 having a plurality of toothed portions (detected portions) 21a provided on the outer periphery. The electromagnetic pickup 22 arranged as described above and the waveform shaper 23 that shapes the waveform of the electric signal output from the electromagnetic pickup 22 are provided.

  FIG. 2 shows details of the rotation angle detection device 20. The timing rotor 21 rotates integrally with the crankshaft 8 in the rotation direction D. The plurality of tooth portions 21a,. . , 21a are provided along the rotation direction D of the timing rotor 21 so that the angle between the adjacent tooth portions 21a is 10 ° except for the tooth missing portion 21b for determining the top dead center (TDC). ing. The missing tooth portion 21b corresponds to two tooth portions 21a. Each tooth portion 21 a has a front front edge Ef in the rotation direction D and a rear rear edge Eb. The electromagnetic pip-up 22 is disposed so as to form a predetermined air gap G with the timing rotor 21. Thus, when the timing rotor 21 rotates with the rotation of the crankshaft 8, the size of the air gap G changes according to the approach and separation of the tooth portions 21a. For this reason, the magnetic flux which passes the coil part (not shown) of the electromagnetic pick-up 22 increases / decreases, and an electromotive force generate | occur | produces in a coil part. Since the voltage of this electromotive force is opposite to each other depending on the approach and separation of each tooth portion 21a, an AC voltage pickup signal P is output from the electromagnetic pip-up 22. The waveform shaper 23 has a waveform shaping circuit that shapes an input signal into a predetermined waveform such as a rectangular wave or a trapezoidal wave. Accordingly, the pickup signal P input to the waveform shaper 23 is shaped into an output signal Ne having a predetermined waveform and input to the ECU 14. An output signal Ne input to the ECU 14 is converted into a digital signal by an A / D converter (not shown) provided in the ECU 14.

  FIG. 3 schematically shows (a) the shape of the tooth portion 21a of the timing rotor 21, (b) the pickup signal P output from the electromagnetic pickup 22, and (c) the output signal Ne output from the waveform shaper 23. It is explanatory drawing shown in. As shown in FIGS. 3A to 3C, when the pickup signal P is shaped by the waveform shaper 23, the front edge Ef of each tooth portion 21a is used as the rising portion Neu of the output signal Ne. The side edge Eb is detected as the falling portion Ned of the output signal Ne. Thereby, the edge detection means of the present invention is constituted by the electromagnetic pip-up 22 and the waveform shaper 23. The ECU 14 uses the rising part Neu or the falling part Ned of the output signal Ne of the waveform shaper 23 as a reference, in other words, using either the front edge Ef or the rear edge Eb as a reference. Can be detected. Further, the ECU 14 determines the time between adjacent tooth portions 21a, that is, the time required for rotation from the front edge Ef of a certain tooth portion 21a to the front edge Ef of the adjacent tooth portion 21a, or after a certain tooth portion 21a. Means is provided for measuring the time required for rotation from the side edge Eb to the rear edge Eb of the adjacent tooth portion 21a based on the output signal Ne. The angular speed (rad / s) of the crankshaft 8 and the engine speed (rpm) of the internal combustion engine 1 can be detected from the time measured by the means and the angle between the adjacent tooth portions 21a.

  However, since the timing rotor 21 has a mechanical error such as a manufacturing error, various dimensions such as the interval and the size of each tooth portion 21a do not exactly match the design value. Therefore, there may be a difference in accuracy between the rotation angle of the crankshaft 8 detected with reference to the front edge Ef of the tooth portion 21a and the rotation angle of the crankshaft 8 detected with reference to the rear edge Eb. Therefore, the rotation angle detection device 20 executes the error learning routine shown in FIG. 4 so that the influence of such a mechanical error can be reduced as much as possible, and either the front edge Ef or the rear edge Eb. Is set as a reference for detecting the rotation angle.

  FIG. 4 is a flowchart showing the contents of the error learning routine. A program of this routine is stored in the ROM of the ECU 14, is started at a predetermined timing, and is repeatedly executed by the ECU 14 at predetermined intervals. In the process of FIG. 4, the ECU 14 determines whether or not either the front edge Ef or the rear edge Eb has been set as a reference (reference edge) for detecting the rotation angle of the crankshaft 8 in step S1. Determine. This determination is made with reference to a management flag described later. If the reference edge has been set, the process proceeds to step S2 to determine whether the learning start condition is successful. The learning start condition is a condition for determining the necessity of reviewing the set reference edge. For example, various parameters such as the travel distance of the vehicle on which the internal combustion engine 1 is mounted and the cumulative operation time of the internal combustion engine 1 have predetermined thresholds. Whether it has been exceeded is included as a requirement for establishment. When the learning start condition is satisfied, the processes of steps S3 to S8 are executed. When the learning start condition is not satisfied, the current routine is finished without performing these processes.

  If a negative determination is made in step S1 or an affirmative determination is made in step S2, in step S3, the angle θf between the adjacent tooth portions 21a is calculated using the front edge Ef as a reference, and the rear edge Eb is used as a reference. An angle θb between the tooth portions 21a adjacent to each other is calculated. Each of the angles θf and θb is calculated for at least one turn of the timing rotor 21. By executing the process of step S3, the ECU 14 functions as an angle detection means. The angles θf and θb may be calculated by an appropriate method. For example, the following formula (1) is used by utilizing a period in which the rotation fluctuation of the crankshaft 8 is as small as possible, for example, a period in which the internal combustion engine 1 is in a fuel cut state and the crankshaft 8 can be regarded as rotating at a constant speed. , (2) may be calculated.

θf = θref × Tf / Tref (1)
θb = θref × Tb / Tref (2)

  Here, θref is a design value of the angle between the adjacent tooth portions 21a, and in the present embodiment, θref = 10 °. Tf is a measurement time between the tooth portions 21a with the front edge Ef as a reference, that is, a measurement time required for rotation from the front edge Ef of a certain tooth portion 21a to the front edge Ef of the adjacent tooth portion 21a. Tb is the measurement time between the tooth portions 21a with the rear edge Eb as a reference in the same manner as Tf.

  Tref is an estimated time required for the rotation between the tooth portions 21a when there is no manufacturing error of the crankshaft 8 and the timing rotor 21 and they are not affected by vibrations when they rotate. is there. This estimated time can be calculated by, for example, the following equation (3) based on the engine speed NE recognized by the ECU 14 when the output signal is detected. The engine speed NE is the engine speed (rpm) per minute.

    Tref = (60 / NE) × (θref / 360) (3)

  Next, the ECU 14 obtains an error Δθf with respect to the design value (predetermined reference value) θref of the angle θf based on the front edge Ef calculated in step S3 (step S4). The error Δθf is Δθf = | θref−θf |. Subsequently, an error Δθb with respect to the design value θref of the angle θb based on the rear edge Eb calculated in step S3 is obtained (step S5). The error Δθb is Δθb = | θref−θb |. FIG. 5A shows the relationship between the angle θf and the error Δθf, and FIG. 5B shows the relationship between the angle θb and the error Δθb. By executing Step S4 and Step S5, the ECU 14 functions as an error calculation unit.

  Next, in step S6, the ECU 14 compares the errors Δθf and Δθb calculated in steps S4 and S5. In this embodiment, the largest error Δθf is specified as the maximum error Δθfmax, and the largest error Δθb is specified as the maximum error Δθbmax, and Δθfmax and Δθbmax are compared. Next, in step S7, the ECU 14 selects either the front edge Ef or the rear edge Eb as a reference edge based on the comparison result in step S6, and the selection result is assigned to a predetermined area in the RAM of the ECU 14. Store in the management flag. In this embodiment, the smaller of the maximum errors Δθfmax and Δθbmax is selected as the reference edge. That is, when the maximum error Δθfmax is smaller than the maximum error Δθbmax, the front edge Ef is selected as the reference edge, and when the maximum error Δθbmax is smaller than the maximum error Δθfmax, the rear edge Eb is selected as the reference edge.

  Next, in step S8, the ECU 14 sets an absolute angle so that the rotation angle of the crankshaft 8 is detected based on the reference edge selected in step S7, and ends the current routine. For example, when it is necessary to change the reference edge from the front edge Ef to the rear edge Eb as a result of the selection in step S8, the absolute angle is equal to the tooth width of the tooth portion 21a, that is, the front edge Ef-the rear edge Eb. The angle α between them is changed (see FIG. 3C). By executing step S8, the ECU 14 functions as a reference setting unit.

  According to the process of FIG. 4, since the one with the smallest maximum error is selected as the reference edge of the front edge Ef or the rear edge Eb, the influence of the mechanical error in detecting the rotation angle of the crankshaft 8 is as much as possible. Can be small. In addition, among the processes in FIG. 4, Steps S <b> 3 to S <b> 8 are executed each time a predetermined learning start condition is satisfied, and the reference edge is reviewed. Therefore, even when the rotation angle detection accuracy based on one edge is deteriorated due to, for example, missing teeth, an edge with higher accuracy is set as the reference edge.

  Next, misfire detection processing will be described as an example of processing executed by the ECU 14 in accordance with the detection result of the rotation angle of the crankshaft 8. FIG. 6 is a flowchart showing the contents of the misfire detection routine. This misfire detection routine is repeatedly executed at predetermined intervals in parallel with the error learning routine of FIG. By executing this routine, the ECU 14 functions as the processing execution means of the present invention. In step S11, the ECU 14 first determines whether the rotation angle of the crankshaft 8 is in the misfire determination section. The misfire determination section is set to a predetermined section near the compression TDC of each cylinder 2. If it is not the misfire determination section, the current routine is terminated. If it is the misfire determination section, the process proceeds to step S12. In step S12, the ECU 14 calculates the current angular velocity ω of the crankshaft 8. Next, in step S13, the ECU 14 compares the angular velocity ω calculated in step S12 with the normal reference angular velocity ω0. The reference angular velocity ω 0 is a value determined in advance according to the operating state of the internal combustion engine 1, and is stored as a map in the ROM of the ECU 14. When misfire occurs, the rotation of the crankshaft 8 becomes slower than normal. Therefore, in step S14, the ECU 14 determines whether or not the angular velocity ω is less than the reference angular velocity ω0. If the angular velocity ω is less than the reference angular velocity ω0, the ECU 14 determines that misfire has occurred in step S15 and ends the current routine. On the other hand, when the angular velocity is equal to or higher than the reference angular velocity, the current routine is finished without determining that the misfire has occurred.

  According to the process of FIG. 6, the learning result of the error learning routine of FIG. 4 is reflected in each of the rotation angle of the crankshaft 8 used in step S11 and the angular velocity ω calculated in step S12. The accuracy of detection or calculation of the angle and the angular velocity is improved, and as a result, the accuracy of the misfire detection process is improved.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. This form is different from the first embodiment only in the error learning routine. Therefore, in the following description, the description of the configuration common to the first embodiment is omitted. FIG. 7 is a flowchart showing the contents of the error learning routine of the second embodiment. This form is applied to a form in which the front edge Ef is set as the initial setting of the reference edge of the rotation angle detection device 10. In the process of FIG. 7, the ECU 14 determines whether or not the learning start condition is satisfied in step S21. This process is the same as step S2 in FIG. If the learning start condition is satisfied, the process proceeds to step S22. On the other hand, if the learning start condition is not satisfied, the subsequent processing is skipped and the current routine is terminated.

  In step S22, an angle θf with respect to the front edge Ef and an angle θb with respect to the rear edge Eb are calculated. This process is the same as step S3 in FIG. Next, the ECU 14 calculates the error Δθf in step S23 and the error Δθb in step S24, and then determines whether the maximum error Δθfmax is larger than the maximum error Δθbmax in step S25. Δθf, Δθb, Δθfmax, and Δθbmax are the same as those described above. If the determination in step S25 is affirmative, the rotation angle can be detected with higher accuracy when the rear edge Eb is used as the reference edge. Therefore, in step S26, the reference edge is set after the front edge Ef. The absolute angle is set so as to be changed to the side edge Eb, and the current routine is terminated. On the other hand, if a negative determination is made in step S25, step S26 is skipped, the setting of the reference edge is maintained at the front edge Ef, and the current routine is finished. Thereby, also in the process of FIG. 7, the effect similar to 1st Embodiment can be show | played. Note that when the rear edge Eb is set as the initial setting of the reference edge, the process according to FIG. 7 may be executed. Specifically, a routine in which the direction of the inequality sign in step S25 in FIG. 7 is reversed may be used.

(Third embodiment)
Next, a third embodiment of the present invention will be described. This form is different from the first embodiment only in the error learning routine. Therefore, in the following description, the description of the configuration common to the first embodiment is omitted. FIG. 8 is a flowchart showing the contents of the error learning routine of the third embodiment. Similar to the second embodiment, this form is applied when the front edge Ef is set as the initial setting of the reference edge of the rotation angle detecting device 10.

  In the process of FIG. 8, the ECU 14 first determines whether or not the learning start condition is satisfied in step S31. This process is the same as step S2 in FIG. When the learning start condition is satisfied, the process proceeds to step S32. On the other hand, when the learning start condition is not satisfied, the subsequent processing is skipped and the current routine is terminated.

  In step S32, an angle θf with respect to the front edge Ef is calculated. The calculation of the angle θf may be the same as in step S3 in FIG. Next, the ECU 14 calculates an error Δθf in step S33, and determines in step S34 whether the error Δθf exceeds the allowable range. The calculation of the error Δθf may be the same as in the first embodiment. The allowable range may be set as appropriate according to the detection result of the rotation angle detection device 20 according to the usage form. In this embodiment, the allowable range is set to the extent that the accuracy of misfire detection is such that there is no problem in practical use. In the process of step S34, when all the errors Δθf obtained for each of the adjacent tooth portions 21a are not within the allowable range, it is determined that the error Δθf exceeds the allowable range.

  If it is determined in step S34 that the error Δθf exceeds the allowable range, the absolute angle is set in step S35 so that the reference edge setting is changed from the front edge Ef to the rear edge Eb. End the routine. On the other hand, if a negative determination is made in step S25, step S26 is skipped, the setting of the reference edge is maintained at the front edge Ef, and the current routine is finished. Thereby, also in the process of FIG. 8, the same effect as the case of 1st Embodiment can be show | played. Further, by appropriately setting the allowable range, any one of the front edge Ef and the rear edge Eb can be functioned as a backup for the other, so that the reliability of the rotation angle detection device 20 can be improved. . In the case where the rear edge Eb is set as the initial setting of the reference edge, the processing according to FIG. 8 may be executed. Specifically, a routine in which the angle θf in step S32 is changed to the angle θb and the error Δθf in steps S33 and S34 is changed to the error Δθb may be used.

  The present invention is not limited to the above-described embodiments, and may be implemented in various forms within the scope of the gist of the present invention. The detection target is not limited to the crankshaft of the internal combustion engine. For example, a rotation member provided in the internal combustion engine such as a camshaft may be used, or a rotation member other than the internal combustion engine may be the detection target.

  The form of the rotating body and the edge detection means is not particularly limited. For example, the rotating body of the present invention has a configuration in which a plurality of slits (detected portions) are provided along the rotation direction, and the edge detection device has a light emitting means for irradiating light toward the slit, and the rotating body. And a light receiving means that is provided on the opposite side of the light emitting means and receives the light emitted by the light emitting means and outputs an electrical signal corresponding to the light intensity.

  In the first and second embodiments, the magnitudes of the maximum errors Δθfmax and Δθbmax are compared, but the average value of the errors Δθf may be compared with the average value of the error Δθb. In short, it is only necessary to make it possible to evaluate errors using various statistical processes in terms of whether the detection accuracy of the rotation angle is improved by using either the front edge Ef or the rear edge Eb as a reference.

The figure which showed the principal part of embodiment which applied the rotation angle detection apparatus of this invention to the internal combustion engine. The figure which showed the detail of the rotation angle detection apparatus of FIG. Explanatory drawing which showed typically the shape of the tooth | gear part of a timing rotor, the pickup signal output from an electromagnetic pickup, and the signal after the waveform shaping output from a waveform shaper. The flowchart which showed the content of the error learning routine. Explanatory drawing which showed the relationship between the angle between adjacent tooth parts, and an error. The flowchart which shows the content of the misfire detection routine. The flowchart which showed the content of the error learning routine which concerns on 2nd Embodiment. The flowchart which showed the content of the error learning routine which concerns on 3rd Embodiment.

Explanation of symbols

1 Internal combustion engine 8 Crankshaft (target to be detected)
14 ECU (angle detection means, error detection means, reference setting means, processing execution means)
20 Rotation angle detector 21 Timing rotor (rotating body)
21a Tooth part (detected part)
22 Electromagnetic pickup (edge detection means)
23 Waveform shaper (edge detection means)

Claims (4)

A rotating body attached to the detection target and having a plurality of detection portions provided along the rotation direction, and a front edge of the rotation body of each detection portion in the rotation direction forward and a rear edge at the rear of the rotation direction. And a rotation angle detection device that detects a rotation angle of the detection target on the basis of either the front edge or the rear edge detected by the edge detection means. Because
Of the plurality of detected parts, an angle calculating unit capable of calculating an angle between the detected parts adjacent to each other based on each of the front edge and the rear edge, and the angle calculated by the angle calculating means An error calculating means for calculating an error with respect to a predetermined reference value, and comparing the error at the angle calculated based on the front edge with the error at the angle calculated based on the rear edge. And a reference setting means for setting either one of the front edge or the rear edge as a reference for detecting the rotation angle of the detection target based on the comparison result. Angle detection device.   The reference setting means is based on the maximum error in the angle calculated based on the front edge and the rear edge among the errors between the detected parts adjacent to each other calculated by the error calculation means. 2. The maximum error in the calculated angle is specified, and the one of the front edge and the rear edge with the specified maximum error being smaller is set as the reference. Rotation angle detection device. A rotating body attached to the detection target and having a plurality of detection portions provided along the rotation direction, and a front edge of the rotation body of each detection portion in the rotation direction forward and a rear edge at the rear of the rotation direction. And a rotation angle detection device that detects a rotation angle of the detection target on the basis of either the front edge or the rear edge detected by the edge detection means. Because
Of the plurality of detected parts, an angle calculating unit capable of calculating an angle between the detected parts adjacent to each other based on each of the front edge and the rear edge, and the angle calculated by the angle calculating means An error calculating means for calculating an error with respect to a predetermined reference value, and if the error for either the front edge or the rear edge calculated by the error calculating means exceeds an allowable range, the front edge Or a reference setting means for setting either one of the rear edges as a reference for detecting the rotation angle of the detection target. A rotating body attached to a crankshaft of an internal combustion engine and having a plurality of detected portions provided in the rotation direction, a front edge of each detected portion in the rotation direction forward of the rotation body, and a rear side in the rotation direction rear Edge detection means capable of detecting each of the edges, and a process execution means for detecting a rotation angle of the crankshaft based on a detection result of the edge detection means and executing a predetermined process according to the detection result. An internal combustion engine operation control apparatus comprising:
Of the plurality of detected parts, an angle calculating unit capable of calculating an angle between the detected parts adjacent to each other based on each of the front edge and the rear edge, and the angle calculated by the angle calculating means Error calculating means for calculating an error with respect to a predetermined reference value of
The processing execution means compares the error in the angle calculated based on the front edge with the error in the angle calculated based on the rear edge, and based on the comparison result, An operation control device for an internal combustion engine, wherein the rotation angle of the crankshaft is detected with reference to either the front edge or the rear edge.

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