JP4544003B2 - 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 measures against mechanical errors such as unevenness of the rotating body are not taken, there is a possibility that the influence due to the mechanical errors becomes large.

  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.

  The first rotation angle detection device of the present invention includes a rotating body attached to a detection target and provided with two or more detection parts along the rotation direction, and is selected from the two or more detection parts. A rotation angle detection device that detects a rotation angle of the detection target using a detection target group composed of a plurality of detection target units, and includes a plurality of detection target groups having different combinations of the detection target units. Angle calculating means for calculating an angle between the detected parts for each candidate, error calculating means for calculating an error of the angle calculated by the angle calculating means with respect to a predetermined reference value, and the plurality of detected part groups The detected parts used for detecting the rotation angle of the detection target from the candidates of the plurality of detected part groups based on the comparison result, comparing the errors calculated for each of the candidates Detected to select group By providing a group selection unit, and to solve the problems described above (claim 1).

  According to the first rotation angle detection device, an error is calculated for each of the plurality of detection target group candidates, and a target to be detected is selected from the plurality of detection target group candidates based on a result of comparison of the errors. A detection target group to be used for detecting the rotation angle is selected. Accordingly, it is possible to use a more accurate detected unit group for detecting the rotation angle, and therefore, it is possible to reduce the influence of the mechanical error of the rotating body when detecting the rotation angle of the detection target. .

  In the first rotation angle detection device, the error may be compared so that a detection target group that is less affected by the mechanical error of the rotating body is selected from a plurality of detection target group candidates. For example, as one aspect thereof, the detected unit group selecting unit specifies a maximum error for each of the plurality of detected unit group candidates from the errors calculated by the error calculating unit, and specifies the specified maximum A candidate with the smallest error may be selected as the detected section group used for detecting the rotation angle of the detected target (claim 2).

  Further, in the first rotation angle detection device, the detected unit group based on the front edge in the rotation direction front of the rotating body as a candidate for the detected unit group, and the rear side in the rotation direction of the rotating body At least one of the detected part groups based on the edge may be included (claim 3). There may be a difference in accuracy between the rotation angle of the detection target detected with reference to the front edge and the rotation angle of the detection target detected with reference to the rear edge. Since the detection target group is selected in consideration of such a difference in accuracy, the influence of the mechanical error can be further reduced.

  The second rotation angle detection device of the present invention comprises a rotating body attached to a detection target and provided with two or more detection parts along the rotation direction, and is selected from the two or more detection parts. A rotation angle detection device that detects a rotation angle of the detection target using a detection target group composed of a plurality of detection target units, and calculates an angle between the detection target parts of the detection target group. An angle calculating means; an error calculating means for calculating an error with respect to a predetermined reference value of the angle calculated by the angle calculating means; and the detected object when the error calculated by the error calculating means exceeds an allowable range. Select another detection target group to be used for detecting the rotation angle of the detection target instead of the detection target group from candidates of the detection target group in which the combination of the detection target group and the detection target part is different. By providing the detected part group selection means, To solve the problems mentioned (claim 4).

  According to the second rotation angle detection device, when the error of the detected unit group in use exceeds the allowable range, the other detected unit group having a different combination of the detected unit group and the detected unit is Selected. Therefore, another group of detected parts can function as a backup. As a result, for example, when the accuracy of the detected unit group in use deteriorates due to, for example, deterioration of the rotating body, it is possible to switch to another detected unit group. Can be reduced as much as possible.

The operation control device for an internal combustion engine according to the present invention is selected from a rotating body attached to a crankshaft of an internal combustion engine and having a plurality of detected portions provided along a rotation direction, and the two or more detected portions. Operation control of an internal combustion engine comprising: a process execution unit that detects a rotation angle of the crankshaft using a group of detected parts including a plurality of detected parts and executes a predetermined process according to the detection result An angle calculating means for calculating an angle between the detected parts for each of a plurality of detected part group candidates having different combinations of the detected parts; and the angle calculated by the angle calculating means. An error calculating means for calculating an error with respect to a predetermined reference value,
The processing execution means compares the error calculated for each of the plurality of detection target group candidates and, based on the comparison result, determines whether the crankshaft of the crankshaft is selected from the plurality of detection target group candidates. The above-mentioned problem is solved by selecting the detected group used for detecting the rotation angle (Claim 5).

  According to this operation control apparatus, an error is calculated for each of a plurality of detection target group candidates, and a detection target is detected from among the plurality of detection target group candidates based on a result of comparing the calculated errors. A detection target group used for detecting the rotation angle is selected. 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, an error is calculated for each of a plurality of detection target group candidates, and based on the result of comparing the calculated errors, a plurality of detection target group candidates are selected. A detection target group used to detect the rotation angle of the detection target is selected. Alternatively, when the error of the detected unit group in use exceeds the allowable range, another detected unit group having a different combination of the detected unit group and the detected unit is selected. Therefore, when detecting the rotation angle of the detection target, it is possible to reduce the influence of the mechanical error of the rotating body.

(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 on the same axis as the crankshaft 8 and has a metal timing rotor (rotating body) 21 provided with two or more tooth portions (detected portions) 21a on the outer periphery, and a tooth portion 21a. The electromagnetic pickup 22 is disposed so as to face each other, and a waveform shaper 23 that shapes the waveform of the electric signal output from the electromagnetic pickup 22. In the following description, the two or more tooth portions 21a may be distinguished from each other by being denoted by reference numerals 21a-0, 21a-1, 21a-2, 21a-3,.

  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. Teeth 21a,. . , 21a are designed along the rotational direction D of the timing rotor 21 so that the angle between the adjacent tooth portions 21a is 3 ° 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.

  ECU14 uses the tooth part group as a to-be-detected part group discretely selected from tooth part 21a-0, 21a-1, 21a-2, ... shown to Fig.3 (a). The rotation angle of the crankshaft 8 is detected. That is, the ECU 14 divides and uses the output signal Ne output according to each tooth portion 21a in order to detect the rotation angle of the crankshaft 8. In the present embodiment, as tooth group candidates that can be used, a tooth group 21A-1 including tooth portions 21a-0, 21a-3, 21a-6,..., And tooth portions 21a-1, 21a-4. , 21a-7,..., 21a-2. As will be described in detail later, the ECU 14 sets a tooth group selected from these tooth group candidates as a tooth group (used tooth group) used for detecting the rotation angle of the crankshaft 8. Then, the ECU 14 is based on one of the rising portion Neu and the falling portion Ned of the output signal Ne output for each tooth portion 21a belonging to the used tooth portion group, in other words, the front edge Ef or the rear edge Eb. The rotation angle of the crankshaft 8 can be detected using either one as a reference. As shown in FIG. 3 (c), the angle between the tooth portions 21a with respect to the front edge Ef is denoted by θfi (i = 1, 2, 3...) And the rear side. The angle between the tooth portions 21a with respect to the edge Eb is given a sign of θbj (j = 1, 2, 3,...) To distinguish them.

  The ECU 14 measures the time between the tooth portions 21a belonging to the used tooth portion group, that is, the time required for the rotation from the front edge Ef of the tooth portion 21a belonging to the used tooth portion group to the front edge Ef of the adjacent tooth portion 21a, or Means is provided for measuring the time required for rotation from the rear edge Eb of the tooth portion 21a to the rear edge Eb of the adjacent tooth portion 21a based on the output signal Ne. The angular velocity (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 tooth portions 21a.

  However, since the timing rotor 21 has a mechanical error such as a manufacturing error, various dimensions such as an interval and a size of each tooth portion 21a do not exactly match the design value. Therefore, the detection accuracy of the rotation angle of the crankshaft 8 may vary depending on the selection of the tooth group to be used. Therefore, the rotation angle detection device 20 executes the error learning routine shown in FIG. 4 so that the influence of the mechanical error can be minimized as much as possible, and uses it from a plurality of tooth group candidates. Select a tooth group.

  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 in step S <b> 1 whether or not the used tooth group has been selected. This determination is made with reference to a management flag described later. If the used tooth group has been selected, the process proceeds to step S2 to determine success or failure of the learning start condition. The learning start condition is a condition for determining the necessity of reviewing the selected use tooth group group. 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 are predetermined. Whether or not the threshold is exceeded is included as a requirement for establishment. When the learning start condition is satisfied, the processes of steps S3 to S7 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, the angle between the tooth portions 21a is calculated in step S3 for each candidate tooth group used. In the present embodiment, as shown in FIG. 3C, the angle Θf1m (m = 1, 2, 3,...) Between the tooth portions 21a of the tooth portion group 21A-1 and the tooth portion group 21A-2. The angle Θf2n (n = 1, 2, 3,...) Between the tooth group 21a is calculated. The angles Θf1m and Θf2n are calculated for at least one turn of the timing rotor 21, respectively. By executing the process of step S3, the ECU 14 functions as an angle calculation unit.

  The angles Θf1m and Θf2n may be calculated as appropriate. For example, the angles Θf1m and Θf2n may be calculated based on signals corresponding to the tooth portions 21a of the tooth portion group 21A-1 or the tooth portion group 21A-2 in the output signal Ne of FIG. Alternatively, the angles θfi between the tooth portions 21a may be calculated based on the output signal Ne and then added together to calculate the angles Θf1m and Θf2n. As can be seen from FIG. 3C, for example, the angles Θf11 and Θf12 are respectively Θf11 = θf1 + θf2 + θf3 and Θf12 = θf4 + θf5 + θf6, and the angles Θf21 and Θf22 are Θf21 = θf2 + θf3 + θf4, Θf22 = θf5 + θf6 + θf5 + θf6 + .

  The angle Θf1m, Θf2n, or angle θfi is, for example, a period in which the rotational 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. It may be calculated based on the following equation (1). Although the angle θfi will be described below, the angles Θf1m and Θf2n can be calculated in the same manner.

    θfi = θref × Tfi / Tref (1)

  Here, θref is a design value of the angle between the adjacent tooth portions 21a, and in the present embodiment, θref = 3 °. Tfi (i = 1, 2, 3,...) Is a measurement time between the tooth portions 21a with respect to the front edge Ef, that is, the front edge of the adjacent tooth portion 21a from the front edge Ef of a certain tooth portion 21a. This is the measurement time required for rotation up to Ef.

  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 the following equation (2), for example, based on the engine speed NE recognized by the ECU 14 when the output signal is detected.

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

  Next, in step S4, the ECU 14 designs the error ΔΘf1m (m = 1, 2, 3,...) Of the angle Θf1m with respect to the design value Θref (= 3 × θref = 9 °) as a predetermined reference value, and the design. An error ΔΘf2n (n = 1, 2, 3,...) Of the angle Θf2n with respect to the value Θref is calculated. The error ΔΘf1m is ΔΘf1m = | Θref−Θf1m |, and the error ΔΘf2n is ΔΘf2n = | Θref−Θf2n |. FIG. 5A shows the relationship between the angle Θf1m and the error ΔΘf1m, and FIG. 5B shows the relationship between the angle Θf2n and the error ΔΘf2n. By executing step S4, the ECU 14 functions as an error calculation unit.

  Next, in step S5, the ECU 14 compares the error ΔΘf1m with the error ΔΘf2n. In this embodiment, the largest error error ΔΘf1m is specified as the maximum error ΔΘf1max, and the largest error error ΔΘf2n is specified as the maximum error ΔΘf2max, and ΔΘf1max and ΔΘf2max are compared. Next, in step S6, the ECU 14 selects the use tooth group from the tooth group 21A-1 and the tooth group 21A-2 based on the comparison result of step S5, that is, the tooth group 21A-1 and the tooth group 21A-2. The selection result is stored in a management flag assigned to a predetermined area of the RAM of the ECU 14. In this form, the one with the smallest maximum error is selected as the use tooth group. That is, when the maximum error ΔΘf1max is smaller than the maximum error ΔΘf2max, the tooth group 21A-1 is used as the tooth group used, and when the maximum error ΔΘf2max is smaller than the maximum error ΔΘf1max, the tooth part is used as the tooth group used. Group 21A-2 is selected. By executing step S6, the ECU 14 functions as a detected unit group selection unit.

  Next, in step S7, the ECU 14 sets an absolute angle so that the rotation angle of the crankshaft 8 is detected based on the used tooth group selected in step S6, and ends the current routine. For example, as a result of the selection in step S6, when it is necessary to change the tooth group to be used from the tooth group 21A-1 to the tooth group 21A-2, the absolute angle is one pitch, that is, the tooth 21a-0. And the tooth portion 21a-1 is changed by an angle θf1 (see FIG. 3C).

  According to the processing of FIG. 4, among the use tooth group candidates, the one with the smallest maximum error is selected as the use tooth group, so that the influence of the mechanical error in detecting the rotation angle of the crankshaft 8 is as small as possible. it can. In addition, among the processes in FIG. 4, Steps S <b> 3 to S <b> 7 are executed whenever a predetermined learning condition is satisfied, and the used tooth group is reviewed. Therefore, even when the detection accuracy of the rotation angle based on the tooth group being used is deteriorated due to, for example, missing teeth, a tooth group having higher accuracy is set as the used tooth group.

  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.

  In the above embodiment, the tooth group 21A-1 and the tooth group 21A-2 based on the front edge Ef are used as candidates for the tooth group used, but there are no particular restrictions on the candidate tooth group used. For example, the tooth group based on the rear edge Eb may be included in the use tooth group candidates, the error of each candidate may be calculated, and the use tooth group may be selected based on the error comparison result. Good. This is because a difference in accuracy may occur 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. As an example, other examples of the error learning routine are shown in FIGS. In these drawings, the same processes as those in FIG. 4 are denoted by the same reference numerals, and repeated description will be omitted as appropriate.

  First, the process of FIG. 7 will be described. In this figure, step S3 of FIG. 4 is changed to step S31. In step S31, as the angles calculated by the ECU 14, an angle Θf1m with respect to the front edge Ef belonging to the tooth group 21A-1 and an angle Θb1m with respect to the rear edge Eb (m = 1, 2, 3,. (See FIGS. 3A and 3C). Next, in FIG. 8, step S3 of FIG. 4 is changed to step S32. In step S32, as the angles calculated by the ECU 14, the angle Θf1m with respect to the front edge Ef belonging to the tooth group 21A-1 and the angle Θb1m with respect to the rear edge Eb (m = 1, 2, 3,. ), And an angle Θf2n with respect to the front edge Ef belonging to the tooth group 21A-2 and an angle Θb2n with respect to the rear edge Eb (n = 1, 2, 3,...) Are included. (See FIG. 3C).

  The other processes in FIGS. 7 and 8 are performed according to FIG. That is, an error is obtained for each candidate for the tooth group used, and the candidate with the smallest maximum error is selected as the tooth group used.

(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. 9 is a flowchart showing the contents of the error learning routine of the second embodiment. This form is applied when the tooth group 21A-1 is selected as the initial setting of the used tooth group of the rotation angle detection device 20.

  In the process of FIG. 9, the ECU 14 first 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 Θf1m between the tooth portions 21a belonging to the tooth portion group 21A-1 is calculated. Next, the ECU 14 calculates the error ΔΘf1m in step S23, and determines in step S24 whether the error ΔΘf1m exceeds the allowable range. Calculation of the angle Θf1m and the error ΔΘf1m may be the same as in the first embodiment. What is necessary is just to set an allowable range suitably according to the utilization form of the detection result of the rotation angle detection apparatus 20. FIG. 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 S24, when all of the error ΔΘf1m is not within the allowable range, it is determined that the error ΔΘf1m exceeds the allowable range.

  If it is determined in step S24 that the error ΔΘf1m exceeds the allowable range, in step S25, instead of the tooth group 21A-1, another tooth group such as the tooth group 21A-2 is used. Select as a group. Next, in step S26, the ECU 14 sets the absolute angle so that the used tooth group corresponding to the tooth group selected in step S25 is set, and ends the current routine. On the other hand, if a negative determination is made in step S24, step S25 and step S26 are skipped, the setting of the tooth group used is maintained, and the current routine is finished. Thereby, also in the process of FIG. 8, the same effects as those of the first embodiment can be obtained, and the detected unit group 21A-2 can function as a backup of the detected unit group 21A-1. Thereby, for example, when the accuracy of the detected part group 21A-1 in use deteriorates due to aging of the rotating body 21 or the like, the detected part group 21A-2 can be switched to. The influence of the mechanical error of the body 21 can be reduced as much as possible.

  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.

  In each of the above-described embodiments, the rotating body 21 and the electromagnetic pip-up 21 are used. For example, the rotating body of the present invention is configured such that a plurality of slits (detected portions) are provided along the rotation direction. In addition, a light emitting means for irradiating light toward the slit and a light emitting means provided on the opposite side of the light emitting means across the rotating body, receiving the light emitted by the light emitting means and outputting an electrical signal corresponding to the light intensity The present invention may be implemented by a pickup means including a light receiving means.

  In each of the above-described embodiments, the maximum error is specified for the candidate tooth group used and the size of the maximum error is compared. However, there is no limitation on the error evaluation method. For example, you may compare the average value of the error between each candidate tooth | gear part. In short, it is only necessary to make it possible to evaluate errors using various statistical processes in terms of which tooth group is selected to improve the detection accuracy of the rotation angle.

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 the tooth parts which belong to a tooth part group, and an error. The flowchart which shows the content of the misfire detection routine. The flowchart which showed the other example of the misfire detection routine. The flowchart which showed the further another example of the misfire detection routine. The flowchart which showed the content of the error learning routine which concerns on 2nd Embodiment.

Explanation of symbols

1 Internal combustion engine 8 Crankshaft (target to be detected)
14 ECU (angle detection means, error detection means, detected portion group selection means, processing execution means)
20 Rotation angle detector 21 Timing rotor (rotating body)
21a Tooth part (detected part)
21A-1,21A-2 Tooth part group (detected part group)

Claims (5)

A detected unit group comprising a plurality of detected units selected from the two or more detected units, comprising a rotating body attached to the detected target and having two or more detected units provided along the rotation direction. A rotation angle detection device for detecting the rotation angle of the detection target using
An angle calculating means for calculating an angle between the detected parts for each of a plurality of detected part group candidates having different combinations of the detected parts, and a predetermined reference value of the angle calculated by the angle calculating means An error calculating means for calculating an error is compared with the error calculated for each of the plurality of detected unit group candidates, and based on the comparison result, the plurality of detected unit group candidates are selected from the candidates. A rotation angle detection apparatus comprising: a detection target group selection unit that selects the detection target group used for detection of a rotation angle of a detection target.   The detected portion group selecting means specifies a maximum error for each of the plurality of detected portion group candidates from the errors calculated by the error calculating means, and selects a candidate having the smallest specified maximum error. The rotation angle detection device according to claim 1, wherein the rotation angle detection device is selected as the detection target group used for detection of a rotation angle of the detection target.   As a candidate for the detected part group, at least a detected part group based on the front edge in the rotational direction of the rotating body and a detected part group based on the rear edge in the rotational direction of the rotating body. The rotation angle detection device according to claim 1, wherein one of the rotation angle detection devices is included. A group of detection units comprising a plurality of detection units selected from the two or more detection units, each including a rotating body attached to the detection target and having two or more detection units provided along the rotation direction. A rotation angle detection device for detecting a rotation angle of the detection target using
An angle calculating means for calculating an angle between the detected parts of the detected part group, an error calculating means for calculating an error of the angle calculated by the angle calculating means with respect to a predetermined reference value, and the error calculating means When the calculated error exceeds an allowable range, another group of detected parts to be used for detecting the rotation angle of the target to be detected is replaced with the group of detected parts and the target group. A rotation angle detection apparatus comprising: a detection target group selection unit that selects from detection target group candidates having different combinations of detection units. A detected part group comprising a rotating body attached to a crankshaft of an internal combustion engine and provided with a plurality of detected parts along a rotation direction, and a plurality of detected parts selected from the two or more detected parts. An operation control device for an internal combustion engine, comprising: a process execution means for detecting a rotation angle of the crankshaft using
An angle calculating means for calculating an angle between the detected parts for each of a plurality of detected part group candidates having different combinations of the detected parts, and a predetermined reference value of the angle calculated by the angle calculating means An error calculating means for calculating an error,
The processing execution means compares the error calculated for each of the plurality of detection target group candidates and, based on the comparison result, determines whether the crankshaft of the crankshaft from the plurality of detection target group candidates. An operation control apparatus for an internal combustion engine, characterized in that the detected section group used for detecting a rotation angle is selected.

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