JP2011002383A - Abnormality detector for rotation sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an abnormality detector for a rotation sensor, capable of detecting such an abnormality that a pulse signal having an output mode different from the output mode representing an actual rotation direction of a rotating member, is output from the rotation sensor.SOLUTION: This abnormality determination device is used for detecting the abnormality of a crank position sensor 42 which outputs the pulse signal Sp at each timing when a crank shaft 31 of an internal combustion engine 11 rotates through a prescribed angle, and varies a pulse width of the pulse signal Sp in accordance with the rotation direction of the crank shaft 31. An ECU 41 is configured to determine the abnormality of the crank position sensor 42 when detecting the pulse signal Sp whose pulse width differs from a prescribed width corresponding to a forward rotation of the crank shaft 31 in a determination period in which the crank shaft 31 is in only the state of the forward rotation.

Description

  The present invention relates to an abnormality detection device for a rotation sensor that outputs a pulse signal with a different output mode depending on the rotation direction every time an output shaft of an internal combustion engine rotates by a predetermined angle.

  In recent years, in order to improve fuel efficiency and reduce exhaust gas, a vehicle that automatically stops the internal combustion engine when the vehicle is stopped and performs automatic stop / restart control that automatically restarts the internal combustion engine when the vehicle is started is put into practical use. ing. In such a vehicle, the crank angle when the internal combustion engine automatically stops is stored, and the fuel injection timing at the time of restart is determined based on the crank angle, thereby shortening the start time at the time of restart. I am doing so.

  Here, the rotational behavior of the crankshaft when the internal combustion engine is stopped will be described. First, when fuel injection is stopped when the internal combustion engine is stopped, the rotational speed of the crankshaft (engine rotational speed) gradually decreases. At this time, in the cylinder in the compression stroke, the air in the combustion chamber is compressed, and a force in a direction that prevents the crankshaft from rotating by pushing back the piston acts on the piston. Therefore, when the engine rotation speed decreases to “0”, the crankshaft starts to rotate in the reverse direction due to the aerodynamic force of the cylinder in the compression stroke. When the rotational speed of the crankshaft that has been rotating in the reverse direction is reduced to “0”, the crankshaft is rotated forward again by the aerodynamic force of the cylinder in which the air is compressed during the reverse rotation. Since the crankshaft is completely stopped after repeating forward and reverse rotation in this way, a rotation sensor that can detect the rotation of the crankshaft in both forward and reverse directions is used as a rotation sensor that detects the crank angle. Yes.

  As this type of rotation sensor, there is known a sensor capable of discriminating the rotation direction by outputting a pulse signal (crank angle signal) having a different mode depending on the rotation direction of the crankshaft. For example, in the rotation sensor described in Patent Document 1, the pulse width of the pulse signal is varied according to the rotation direction of the crankshaft.

  By the way, in such a rotation sensor, for example, when an abnormality such as a disconnection of a signal line that transmits a pulse signal occurs, the rotation of the crankshaft cannot be detected. Therefore, in the conventional abnormality detection device, the voltage level of the pulse signal is detected, and if the pulse signal continues to be at the H level or L level for a predetermined time or longer, it is determined that the rotation sensor is abnormal. Yes.

JP 2005-233622 A

  By the way, in the rotation sensor described in Patent Document 1, a pulse signal having a pulse width different from the pulse width indicating the actual rotation direction of the crankshaft may be output due to an abnormality occurring in the rotation sensor. . For example, if an abnormality occurs in the timer provided inside the sensor due to deterioration over time, the pulse width of the pulse signal cannot be properly controlled, and the reverse rotation occurs despite the crankshaft rotating in the forward direction. There is a possibility that a pulse signal having a pulse width indicating that it exists is output. However, since the conventional abnormality detection device only detects the voltage level of the pulse signal, there is a problem that such an abnormality cannot be detected.

  Such a problem is not limited to the rotation sensor that changes the pulse width of the pulse signal in accordance with the rotation direction of the crankshaft. For example, in the rotation sensor that changes other output modes such as the voltage level, the pulse is caused by the abnormality. Even if the output mode of the signal cannot be properly controlled, it can occur in the same manner.

  The present invention has been made in order to solve the above-described problems, and its purpose is that a pulse signal having an output mode different from an output mode indicating the actual rotation direction of the rotating member is output from the rotation sensor. An object of the present invention is to provide a rotation sensor abnormality detection device capable of detecting an abnormality.

In the following, means for achieving the above object and its effects are described.
According to the first aspect of the present invention, in the abnormality detection device for a rotation sensor that outputs a pulse signal with a different output mode depending on the rotation direction each time the output shaft of the internal combustion engine rotates by a predetermined angle, the output shaft rotates in the forward direction. However, there is provided a determination means for determining that the rotation sensor is abnormal when a pulse signal having an output mode different from the output mode corresponding to the forward rotation of the output shaft is detected within the determination period. And

  In the above configuration, the determination unit detects that the rotation sensor is abnormal when detecting a pulse signal having an output mode different from the output mode corresponding to the output mode during the positive rotation of the output shaft within the determination period in which the output shaft is only rotating forward. I am trying to judge. Therefore, for example, when an output mode pulse signal corresponding to the reverse rotation is output even though the output shaft is rotating forward, the output mode is different from the output mode corresponding to the actual rotation direction of the output shaft. An abnormality such as a pulse signal being output can be detected.

  According to a second aspect of the present invention, in the abnormality detection device for a rotation sensor according to the first aspect, the determination means is a pulse having an output mode different from an output mode corresponding to a positive rotation of the output shaft within the determination period. The gist is to count the number of abnormality detections that have detected a signal and determine that the rotation sensor is abnormal when the number of abnormality detections exceeds a threshold value.

  According to the above configuration, since the rotation sensor is determined to be abnormal when the number of abnormality detections exceeds the threshold, the output corresponding to the pulse signal output mode accidentally during reverse rotation due to the influence of noise or the like, for example. It can be prevented that the determination means erroneously determines that the rotation sensor is abnormal, for example, in the case of an aspect.

  According to a third aspect of the present invention, in the abnormality detection device for the rotation sensor according to the first or second aspect, the determination means is configured such that the rotational speed of the output shaft is equal to or higher than a lower limit rotational speed at which the reverse rotation of the output shaft does not occur. The gist is that a predetermined rotation speed period is set as the determination period.

  As described above, the output shaft temporarily reversely rotates when the internal combustion engine is stopped, but does not reversely rotate in a region where the output shaft rotation speed (engine rotation speed) is somewhat high. In view of this point, a predetermined rotation speed period equal to or higher than the lower limit rotation speed at which the output shaft does not reversely rotate can be set as the determination period.

  According to a fourth aspect of the present invention, in the rotation sensor abnormality detection device according to any one of the first to third aspects, the determination means is driven by a starter motor that rotates the output shaft in the forward direction when the internal combustion engine is started. The gist is that the starting period, which is a state, is set as the determination period.

  During the period in which the starter motor is driven, the output shaft is normally considered to be rotating in the forward direction. Therefore, as in claim 4, the starter motor that rotates the output shaft in the forward direction when the internal combustion engine is started is in the drive state. A certain starting period can be set as the determination period.

  According to a fifth aspect of the present invention, in the abnormality detection device for a rotation sensor according to the second aspect, the determination means has a predetermined rotational speed of the output shaft equal to or higher than a lower limit rotational speed at which the reverse rotation of the output shaft does not occur. The determination period is a rotation speed period and a start period in which the starter motor that rotates the output shaft in the forward direction at the start of the internal combustion engine is set as the determination period, and the threshold value is the value during the predetermined rotation speed period. The gist is to set it larger than the value in the period.

  As the threshold value is increased, the determination accuracy of whether or not the rotation sensor is abnormal can be improved. However, since it takes a long time to determine that the rotation sensor is abnormal, it is quickly determined that the rotation sensor is abnormal. However, the fail-safe process cannot be executed, and the starting time may be prolonged at the time of starting. In this regard, according to the above configuration, since the threshold value in the start period is set smaller than the threshold value in the predetermined rotation speed period, it is possible to accurately determine the abnormality of the sensor in the predetermined rotation speed period, and quickly in the start period. It becomes possible to execute the fail-safe process by making an abnormality determination, and the start-up time can be prevented from being prolonged.

  According to a sixth aspect of the present invention, in the rotation sensor abnormality detection device according to the fourth or fifth aspect, in addition to the starter motor being in a driving state, a transmission connected to the internal combustion engine transmits power. The gist of the invention is that the start-up period is a neutral state to be shut off.

  For example, if the driver does not step on the brake pedal when restarting on an uphill road, the vehicle may move backward due to its own weight. Thus, if the transmission is not in a neutral state when the vehicle moves backward due to its own weight, the output shaft rotates in the reverse direction. In view of this point, the period in which the starter motor is driven and the transmission is in the neutral state is set as the starting period, so that the period in which the output shaft is only positively rotated is determined as the starting period. That is, the determination period can be set, and the determination means can be prevented from erroneously determining that the rotation sensor is abnormal.

  According to a seventh aspect of the present invention, in the abnormality detection device for a rotation sensor according to the fourth or fifth aspect, in addition to the starter motor being in a driving state, the vehicle on which the internal combustion engine is mounted is in a stopped state. The gist is that the period is the start period.

  If the driver does not step on the brake pedal when restarting on the uphill as described above, the vehicle may move backward due to its own weight, but if the vehicle is in a stopped state, the output shaft is rotating in reverse. It can be judged that there is no. Based on this point, the starter motor is driven and the period in which the vehicle in which the internal combustion engine is mounted is stopped is set as the start period, so that the transmission is not in the neutral state. Even in such a case, the period during which the output shaft is only positively rotated can be set as the start period, that is, the determination period, and it is possible to prevent the determination means from erroneously determining that the rotation sensor is abnormal.

  According to an eighth aspect of the present invention, in the rotation sensor abnormality detection device according to any one of the fourth to seventh aspects, an output mode pulse signal corresponding to the start period and a reverse rotation of the output shaft is provided. The reverse rotation corresponding period for returning the rotation position of the output shaft to the retarded side overlaps when detected, and an abnormality of the rotation sensor is detected within the overlap period of the start period and the reverse rotation corresponding period. In this case, after clearing the calculated value of the rotational position of the output shaft, the period corresponding to the reverse rotation is ended and the output shaft is rotated forward regardless of the output mode of the pulse signal. The present invention includes a rotation angle calculation means for calculating the rotation position of the output shaft based on the output of the above.

  The output shaft normally rotates in the overlap period between the start period and the reverse rotation corresponding period, but a pulse signal of an output mode corresponding to the reverse rotation of the output shaft was detected within the same period due to an abnormality of the rotation sensor. In this case, the rotational position (rotational angle) of the output shaft is erroneously returned to the retarded angle side, and the rotational position becomes inaccurate. Here, only by clearing the calculated value of the rotational position of the output shaft, the rotational position of the output shaft is erroneously returned to the retard side, so that the rotational position becomes inaccurate.

  In this regard, in the above configuration, when an abnormality of the rotation sensor is detected, the calculated value of the rotation position of the output shaft is cleared, and then the reverse rotation corresponding period is ended, regardless of the output mode of the pulse signal. Assuming that is rotating forward, the rotational position of the output shaft is calculated. For this reason, even when an abnormality of the rotation sensor is detected such that the pulse signal output timing is normal but a pulse signal having an output mode different from the output mode indicating the actual rotation direction is output within the overlap period. The internal combustion engine can be reliably restarted.

  According to a ninth aspect of the present invention, in the abnormality detection device for a rotation sensor according to the eighth aspect, a pulse signal having an output mode different from the output mode corresponding to the positive rotation of the output shaft is detected within the overlap period. The gist of the invention is that it includes stop means for stopping fuel injection and ignition to the internal combustion engine.

  In the configuration in which when the abnormality of the rotation sensor occurs within the overlap period of the start period and the reverse rotation corresponding period, the abnormality of the rotation sensor is determined when the number of abnormality detection exceeds the threshold as in claim 2. During a period from when the abnormality of the rotation sensor occurs to when it is determined, fuel injection and ignition to the internal combustion engine are performed based on an incorrect rotation position of the output shaft. In this regard, according to the above configuration, fuel injection and ignition to the internal combustion engine are stopped when a pulse signal having an output mode different from the output mode corresponding to the forward rotation of the output shaft is detected within the overlap period. Therefore, it is possible to prevent the internal combustion engine from being damaged due to fuel injection and ignition based on the wrong rotation position of the output shaft.

  According to a tenth aspect of the present invention, in the rotation sensor abnormality detection device according to any one of the second to ninth aspects, the internal combustion engine is automatically stopped when a predetermined stop condition is satisfied, Control means for performing automatic stop / restart control for automatically starting the internal combustion engine when a restart condition is satisfied, and execution of the automatic stop / restart control when an abnormality of the rotation sensor is detected within the determination period The gist of the invention is that it is provided with prohibition means for prohibiting

  When a pulse signal with an output mode different from the output mode corresponding to the forward rotation is output when the output shaft is rotating forward due to an abnormality of the rotation sensor, the internal combustion engine is calculated based on the pulse signal. The rotational position of the output shaft may be inaccurate. Therefore, when restarting the vehicle, fuel injection, ignition, or the like is performed based on the wrong rotation position of the output shaft, which may cause problems such as poor starting.

  In this respect, according to the above configuration, when the abnormality of the rotation sensor is detected, the prohibition unit prohibits the execution of the automatic stop / restart control, so that the internal combustion engine is restarted based on the incorrect rotation position of the output shaft. Can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which shows the internal combustion engine to which this is applied about one Embodiment of the abnormality detection apparatus of the rotation sensor concerning this invention, and its periphery structure. Schematic which shows the crank position sensor of this embodiment. (A) A timing chart showing an example of a pulse signal and its related value when the crankshaft rotates forward, and (b) a timing chart showing an example of a pulse signal and its related value when the crankshaft rotates in reverse. The timing chart which shows the relationship between a reverse rotation corresponding | compatible period and an engine speed. The flowchart which shows the control procedure about the abnormality detection process by the control apparatus of this embodiment. The flowchart which shows the control procedure about the abnormality detection process in the predetermined rotation speed period by the control apparatus of this embodiment. The flowchart which shows the control procedure about the abnormality detection process in the starting period by the control apparatus of this embodiment. The timing chart which shows the execution aspect about the control of this embodiment. The timing chart which shows an example of the crank counter and its related value in a starting period. The timing chart which shows an example of a pulse signal and its related value when the voltage level of a sub signal is fixed to H level.

Hereinafter, an embodiment embodying an abnormality detection device for a rotation sensor according to the present invention will be described with reference to the drawings.
The internal combustion engine 11 according to the present embodiment is a multi-cylinder internal combustion engine having a plurality of cylinders 12, and FIG. 1 schematically shows one of the plurality of cylinders 12. As shown in the figure, a piston 13 is provided in each cylinder 12 of the internal combustion engine 11 so as to reciprocate. Each cylinder 12 has a combustion chamber 14 defined by the top surface of the piston 13 and the inner peripheral surface of the cylinder 12.

  The internal combustion engine 11 is provided with a fuel injection valve 15 for injecting fuel separately for each cylinder 12. In each combustion chamber 14, the air-fuel mixture composed of intake air and injected fuel is ignited by the spark plug 16, whereby the air-fuel mixture is combusted and the piston 13 reciprocates to serve as an output shaft. The crankshaft 31 rotates. The driving force of the crankshaft 31 is transmitted to driving wheels (not shown) via the transmission 32. The direction in which the crankshaft 31 rotates by the output of the internal combustion engine 11 is defined as the forward direction, and the opposite direction is defined as the reverse direction. The crankshaft 31 is cranked by being rotationally driven by a starter motor 33 when the engine is started.

  In the internal combustion engine 11, the intake passage 21 and the combustion chamber 14 are communicated and blocked by the opening / closing operation of the intake valve 22, and the combustion chamber 14 and the exhaust passage 23 are communicated / blocked by the opening / closing operation of the exhaust valve 24. Is done. The intake valve 22 and the exhaust valve 24 are opened and closed in accordance with the rotation of the intake camshaft 26 and the exhaust camshaft 27 to which the rotation of the crankshaft 31 is transmitted.

  Various controls of the internal combustion engine 11 are performed by an electronic control device (hereinafter referred to as ECU) 41 mounted on the vehicle. The ECU 41 inputs a CPU that executes arithmetic processing related to the control of the internal combustion engine 11, a ROM that stores programs and data necessary for the control, a RAM that temporarily stores arithmetic results of the CPU, and an external signal. For example, and an output port for outputting a signal to the outside.

  Various sensors for detecting the state of the internal combustion engine 11 and the vehicle are connected to the input port of the ECU 41. The various sensors include a crank position CA 42 for detecting the rotation angle of the crankshaft 31 and a cam position for detecting the rotation angle of the intake camshaft 26 and the crank position sensor 42 for detecting the engine rotation speed NE. The sensor 43 is mentioned. In addition to the above sensors, a shift position sensor 44 for detecting a shift position of a shift lever (not shown) operated by a driver, an accelerator position sensor 45 for detecting an accelerator depression amount, and an operation of a brake pedal Examples of the sensor include a brake sensor 46 for detecting a state and a vehicle speed sensor 47 for detecting a vehicle traveling speed.

  On the other hand, the fuel injection valve 15 and the starter motor 33 are electrically connected to the output port of the ECU 41, respectively. The ECU 41 performs various controls such as fuel injection and cranking at the time of engine start based on the detection results of these various sensors.

  Specifically, cylinder discrimination is executed based on output signals from the crank position sensor 42 and the cam position sensor 43, and the fuel injection timing and ignition timing for each cylinder 12 are set based on the crank angle CA.

  Further, the ECU 41 automatically stops the internal combustion engine 11 when a predetermined stop condition is satisfied, and executes automatic stop / restart control for automatically starting the internal combustion engine 11 when the predetermined restart condition is satisfied. That is, the ECU 41 functions as a control unit that executes such automatic stop / restart control.

  In the automatic stop / restart control, for example, when a predetermined stop condition is established such that the brake is depressed and the vehicle is stopped for a predetermined period Δt, the fuel injection is stopped and the internal combustion engine is stopped. 11 is automatically stopped. The ECU 41 determines that an engine start command is output to the internal combustion engine 11 when the internal combustion engine 11 is automatically stopped, for example, when a predetermined restart condition such as release of the brake pedal is satisfied. The starter motor 33 is driven to automatically restart the internal combustion engine 11.

  In the present embodiment, the execution state of the automatic stop / restart control is represented by SS modes of “1” to “4” (see FIGS. 4 and 8). Specifically, “mode 1” indicates a state in which the vehicle is traveling, “mode 2” indicates that the internal combustion engine 11 is automatically stopped, “mode 3” indicates that the internal combustion engine 11 is stopped, and “ “Mode 4” indicates that the internal combustion engine 11 is being restarted.

  The ECU 41 stores the crank angle CA when the internal combustion engine 11 automatically stops, and executes fuel injection at the restart based on the crank angle CA, thereby reducing the start time at the restart. Like to do.

  Here, when the internal combustion engine 11 is stopped, the crankshaft 31 is completely stopped after repeating the forward rotation and the reverse rotation. Therefore, the crank position sensor 42 can detect the rotation of the crankshaft 31 in both the forward and reverse directions. Things are used.

Next, the crank position sensor 42 as a rotation sensor and its peripheral configuration will be described with reference to FIG.
A signal rotor 51 shown in FIG. 2 is provided at the end of the crankshaft 31 so as to be rotatable together with the crankshaft 31. A plurality of teeth 52 are provided on the outer periphery of the signal rotor 51 at predetermined angles (10 ° CA), and a part of the teeth is a missing tooth in which two teeth 52 are missing to detect a reference angle. A portion 53 is formed. The crank position sensor 42 is disposed at a position facing the teeth 52 of the signal rotor 51, and detects the rotational position (crank angle CA) and rotational speed (engine rotational speed NE) of the crankshaft 31.

  The crank position sensor 42 includes a main sensor 61 facing the teeth 52, a sub sensor 62 arranged at a predetermined interval from the main sensor 61 in the circumferential direction of the signal rotor 51, and a main signal Sm from the main sensor 61. And a processing device 63 that outputs a pulse signal Sp corresponding to the sub signal Ss from the sub sensor 62 to the ECU 41. The processing device 63 is provided with a timer 64 for controlling the pulse width of the pulse signal Sp. Then, every time the crankshaft 31 rotates by a predetermined angle, the crank position sensor 42 outputs a pulse signal Sp having a different pulse width depending on the rotation direction.

  Specifically, as shown in FIGS. 3A and 3B, the main signal Sm of the main sensor 61 has a voltage level of L level (when the main sensor 61 faces the teeth 52 of the signal rotor 51). For example, 0V), and the voltage level becomes H level (for example, 5V) when not facing the tooth 52. The sub signal Ss of the sub sensor 62 has a voltage level of L level when the sub sensor 62 faces the teeth 52 of the signal rotor 51, and a voltage level of H when the sub sensor 62 does not face the teeth 52.

  Here, in this embodiment, when the crankshaft 31 is rotating forward, the voltage level of the sub signal Ss of the sub sensor 62 becomes H level when the main signal Sm of the main sensor 61 falls, and the crankshaft 31 is In the case of reverse rotation, the signal rotor 51, the main sensor 61 and the sub sensor 62 are arranged so that the voltage level of the sub signal Ss of the sub sensor 62 becomes H level when the main signal Sm of the main sensor 61 rises. It is installed.

  Therefore, as shown in FIG. 3 (a), the processing device 63 has a predetermined pulse width indicating that the crankshaft 31 is rotating forward if the sub signal Ss is H level when the main signal Sm falls. The α pulse signal Sp is generated, and the pulse signal Sp is output from the crank position sensor 42. On the other hand, as shown in FIG. 3B, when the sub signal Ss is at the H level when the main signal Sm rises, the processing device 63 has a predetermined pulse width β indicating that the crankshaft 31 is rotating in reverse. The pulse signal Sp is generated, and the pulse signal Sp is output from the crank position sensor 42. Note that the predetermined width α and the predetermined width β are different widths, and in the present embodiment, the predetermined width β is set larger than the predetermined width α.

Next, a process for detecting the crank angle CA and the engine rotational speed NE by the ECU 41 of this embodiment will be described.
The ECU 41 increases or decreases the crank counter Cc as the calculated value according to the pulse signal Sp, and detects the crank angle CA based on the value of the crank counter Cc. Specifically, as shown in FIGS. 3A and 3B, when the ECU 41 detects the falling edge of the pulse signal Sp, the ECU 41 increments the crank counter Cc corresponding to the crank angle CA by one (Cc ← Cc + 1). Then, the crank angle CA is once advanced to the predetermined angle advance side. When the pulse width of the pulse signal Sp is the predetermined width α, the value of the crank counter Cc is maintained. On the other hand, when the pulse width of the pulse signal Sp is the predetermined width β, two crank counters Cc are provided. By decrementing (Cc ← Cc-2), the crank angle CA is returned to the predetermined angle retard side.

  In this way, the ECU 41 detects the rotation of the crankshaft 31 in both forward and reverse directions based on the pulse signal Sp output from the crank position sensor 42, and detects the correct crank angle CA when the engine is stopped. Yes. Further, the ECU 41 calculates the rotational speed of the crankshaft 31 (engine rotational speed NE) from the pulse interval included in the pulse signal Sp.

  Here, the crankshaft 31 temporarily reversely rotates immediately before the internal combustion engine 11 is stopped. Therefore, the ECU 41 of the present embodiment decrements the crank counter Cc when the pulse signal having the predetermined width β is detected within the period corresponding to the reverse rotation in which the crankshaft 31 may reversely rotate, that is, the crank angle CA is retarded. The process of returning to the side is performed.

The ECU 41 determines that the reverse rotation corresponding period has started when the following start conditions (a) and (b) are satisfied.
(A) The automatic stop of the internal combustion engine 11 is executed and the fuel injection is stopped.

(A) The engine rotational speed NE is lower than the lower limit rotational speed NEl.
In the present embodiment, the lower limit rotational speed NEl is the minimum rotational speed (for example, 400 rpm) at which the crankshaft 31 does not rotate in reverse.

When the following end conditions (C) to (E) are all satisfied, or when the conditions (E) and (F) are satisfied, the reverse rotation corresponding period is ended.
(C) The internal combustion engine 11 is not being automatically stopped.

(D) The crankshaft 31 has rotated forward for at least one rotation.
(E) The missing tooth portion 53 is detected by the crank position sensor 42.
(F) The starter motor 33 has been driven for a predetermined time (for example, 1 second) or longer.

  Therefore, as shown in FIG. 4, the ECU 41 sets the time ta when the predetermined stop condition is satisfied and the SS mode becomes “mode 2”, and the engine rotational speed NE gradually decreases and becomes lower than the lower limit rotational speed NEl. It is determined that the reverse response period has started. Then, the ECU 41 determines that the reverse rotation corresponding period has ended, for example, at the time tb when all the conditions (c) to (e) of the end conditions are satisfied. Note that the ECU 41 sets the reverse rotation corresponding flag Fg to ON when the reverse rotation corresponding period starts, and sets the reverse rotation corresponding flag Fg to OFF when the reverse rotation corresponding period ends.

  By the way, if an abnormality occurs in the timer 64 provided in the crank position sensor 42 due to aging or the like, the pulse width of the pulse signal Sp cannot be properly controlled, and the crankshaft 31 is rotating forward. Nevertheless, there is a possibility that a pulse signal Sp having a predetermined width β corresponding to the reverse rotation is output.

  In consideration of this point, when the ECU 41 of the present embodiment detects a pulse signal Sp having a pulse width different from the predetermined width α corresponding to the forward rotation of the crankshaft 31 within the determination period in which the crankshaft 31 is only forwardly rotated. In addition, it is determined that the crank position sensor 42 is abnormal. That is, the ECU 41 functions as a determination unit that determines whether the crank position sensor 42 is abnormal.

  More specifically, the ECU 41 uses the predetermined rotation speed period in which the engine rotation speed NE is equal to or higher than the lower limit rotation speed NEl and equal to or lower than the predetermined upper limit rotation speed NEu as the determination period. Note that the upper limit rotational speed NEu is a rotational speed (for example, 1000 rpm) at which, for example, the number of pulses for determining the pulse width increases and the calculation load on the ECU 41 does not become excessive. The ECU 41 also uses the start period in which the starter motor 33 is in a driving state and the transmission 32 is in a neutral state in which power transmission is interrupted as a determination period.

  Then, the ECU 41 counts the number of times of abnormality detection in which the pulse signal Sp having a pulse width different from the predetermined width α corresponding to the forward rotation of the crankshaft 31 is detected within the predetermined rotation speed period, and the abnormality detection number sets the threshold value K1. When exceeded, the crank position sensor 42 is determined to be abnormal. Further, the ECU 41 counts the number of abnormality detections within the start period, and determines that the crank position sensor 42 is abnormal when the number of abnormality detections exceeds a threshold value K2. In the present embodiment, the threshold value K1 in the predetermined rotation speed period is set to be larger than the threshold value K2 in the starting period. Note that the ECU 41 sets the abnormality flag Fe to ON when an abnormality of the crank position sensor 42 is detected. Here, the abnormality flag Fe is set to OFF when the engine is started.

The ECU 41 performs the following fail-safe process when detecting an abnormality of the crank position sensor 42 within the determination period.
Specifically, the ECU 41 prohibits execution of automatic stop / restart control. If an abnormality of the crank position sensor 42 is detected within the overlap period between the start period and the reverse rotation corresponding period, the crank angle CA (crank counter Cc) is cleared, and then the reverse rotation corresponding period is ended and the pulse signal The crank angle CA is calculated based on the output of the pulse signal Sp on the assumption that the crankshaft 31 is rotating forward regardless of the pulse width of Sp. Further, the ECU 41 stops fuel injection and ignition to the internal combustion engine 11 when detecting a pulse signal Sp having a pulse width different from the predetermined width α corresponding to the forward rotation of the crankshaft 31 within the overlap period. I have to. As described above, the ECU 41 functions as a prohibiting unit that prohibits execution of the automatic stop / restart control, a rotation angle calculating unit that calculates the crank angle CA, and a stopping unit that stops fuel injection and ignition.

  When the ECU 41 detects a pulse signal Sp having a pulse width different from the predetermined width α corresponding to the forward rotation of the crankshaft 31 within the overlap period, the ECU 41 sets the cut flag Fc to ON. Here, the cut flag Fc is set to OFF when the engine is started.

  Next, the process procedure of the abnormality detection process performed by the ECU 41 according to the present embodiment will be described with reference to the flowcharts shown in FIGS. The series of processes shown in the flowchart of FIG. 3 is repeatedly executed at a predetermined cycle by the ECU 41 immediately after the internal combustion engine 11 is started.

  First, as shown in FIG. 5, when this process is started, various state quantities are read through the detection signals of the sensors (step S1), the engine speed NE is equal to or lower than the upper limit speed NEu, and It is determined whether or not it is equal to or higher than the lower limit rotational speed NEl (step S2). When the engine rotational speed NE is equal to or lower than the upper limit rotational speed NEu and equal to or higher than the lower limit rotational speed NEl (step S2: YES), an abnormality determination is performed during the predetermined rotational speed period, assuming that the predetermined rotational speed period is reached. (Step S3).

  On the other hand, when the engine rotational speed NE is higher than the upper limit rotational speed NEu or less than the lower limit rotational speed NEl (step S2: NO), it is determined whether or not the starter motor 33 is in a driving state (step S2: NO). Step S4). When the starter motor 33 is in the driving state (step S4: YES), it is determined whether or not the transmission 32 is in the neutral state based on the output signal from the shift position sensor 44 (step S5). When the transmission 32 is in the neutral state (step S5: YES), it is determined that it is the starting period, and an abnormality is determined during the starting period (step S6).

  Note that when the starter motor 33 is not in a driving state (step S4: NO) and when the transmission 32 is not in a neutral state (step S5: NO), this process is temporarily terminated.

Next, a specific processing procedure for abnormality determination in the predetermined rotation speed period in step S3 will be described with reference to the flowchart shown in FIG.
First, when this process is started, various state quantities are read through the detection signals of the sensors (step S301), and the engine speed NE is not more than the upper limit speed NEu and not less than the lower limit speed NE1. It is determined whether or not (step S302). When the engine rotational speed NE is equal to or lower than the upper limit rotational speed NEu and equal to or higher than the lower limit rotational speed NEl (step S302: YES), the pulse width of the pulse signal Sp corresponds to a predetermined width α corresponding to the forward rotation of the crankshaft 31. (Step S303), and when the pulse width is the predetermined width α (step S303: YES), the process proceeds to step S301.

  On the other hand, when the pulse width is not the predetermined width α (step S303: NO), the abnormality counter Ce indicating the number of abnormality detection is incremented (step S304: Ce ← Ce + 1), and whether the abnormality counter Ce is greater than the threshold value K1. Is determined (step S305). When the abnormality counter Ce is equal to or less than the threshold value K1 (step S305: NO), the process proceeds to step S301.

  On the other hand, if a pulse signal whose pulse width is not the predetermined width α is repeatedly output and the abnormality counter Ce is larger than the threshold value K1 (step S305: YES), it is determined that the crank position sensor 42 is abnormal. Thus, the abnormality flag Fe is set to ON (step S306: Fe ← ON). Then, the automatic stop / restart control is prohibited by the ECU 41 when the abnormality flag Fe is set to ON.

  If the engine rotational speed NE is greater than the upper limit rotational speed NEu or less than the lower limit rotational speed NEl before the abnormal counter Ce becomes greater than the threshold value K1, (step S302: NO). Assuming that no abnormality of the crank position sensor 42 is detected within the predetermined rotation speed period, the abnormality counter Ce is cleared (step S307: Ce ← 0), and this process is temporarily terminated.

Next, a specific processing procedure for abnormality determination in the starting period in step S6 shown in FIG. 5 will be described with reference to the flowchart shown in FIG.
First, when this process is started, various state quantities are read through the detection signals of the sensors (step S601), and it is determined whether the starter motor 33 is in a driving state (step S602). If the starter motor 33 is in the driving state (step S602: YES), it is determined whether or not the transmission 32 is in the neutral state (step S603). If the transmission 32 is in the neutral state (step S603) S603: YES), it is determined whether or not the pulse width of the pulse signal Sp is a predetermined width α (step S604). If the pulse width is the predetermined width α (step S604: YES), the process proceeds to step S601.

  On the other hand, when the pulse width is not the predetermined width α (step S604: NO), the abnormality counter Ce is incremented (step S605: Ce ← Ce + 1), and it is determined whether or not the cut flag Fc is set to ON. (Step S606). When the cut flag Fc is not set to ON (step S606: NO), the cut flag Fc is set to ON (step S607: FC ← ON). Here, when the cut flag Fc is set to ON, the fuel injection and ignition to the internal combustion engine 11 are stopped by the ECU 41. Then, after the cut flag Fc is set to ON, it is determined whether or not the abnormality counter Ce is larger than the threshold value K2 (step S608). When the cut flag Fc is set to ON (step S606: YES), the process directly proceeds to step S608.

  In step S608, when the abnormality counter Ce is equal to or less than the threshold value K2 (step S608: NO), the process proceeds to step S601. On the other hand, when the pulse signal Sp whose pulse width is not the predetermined width α is repeatedly output and the abnormality counter Ce becomes larger than the threshold value K2 (step S608: YES), it is determined that the crank position sensor 42 is abnormal. Then, the abnormality flag Fe is set to ON (step S609: Fe ← ON), and the automatic stop / restart control is prohibited. Subsequently, the cut flag Fc and the reverse rotation corresponding flag Fg are set to OFF (step S610: Fc ← OFF, step S611: Fg ← OFF), and the crank counter Cc detects the reference rotation position by the cam position sensor 43. It is cleared after waiting (step S612).

  If the starter motor 33 stops before the abnormal counter Ce becomes larger than the threshold value K2 (step S602: NO), or if the transmission 32 is no longer in the neutral state (step S603: NO), the engine is started. Assuming that no abnormality of the crank position sensor 42 is detected within the period, the abnormality counter Ce is cleared (step S613: Ce ← 0), and this process is temporarily terminated.

  Next, an example of an execution mode of the above process in a period from when the vehicle automatically stops to when it is automatically restarted will be described with reference to a timing chart shown in FIG. Here, as an example, a pulse signal Sp with a predetermined width β is detected although the pulse output timing is normal within the predetermined rotation speed period and the start period, and the number of abnormal detections exceeds the threshold value K1 within the predetermined rotation speed period. First, the case where the abnormality detection frequency exceeds the threshold value K2 and the abnormality of the crank position sensor 42 is detected within the start period will be described. In FIG. 8, for convenience of explanation, the main signal Sm and the sub signal Ss show only the state in which the crankshaft 31 is rotating forward, and show the state in which only the pulse signal Sp having a predetermined width β is being output.

  First, when the vehicle decelerates from the normal traveling state and the engine rotational speed NE becomes equal to or lower than the upper limit rotational speed NEu at time t1, abnormality determination is performed in a predetermined rotational speed period. In this example, since the pulse signal Sp having a predetermined width β is output, the abnormality counter Ce is incremented. Here, if a predetermined stop condition is satisfied within a predetermined rotation speed period and the engine speed NE becomes less than the lower limit rotation speed NEu at time t2 before the abnormality counter Ce becomes larger than the threshold value K1, the abnormality counter Ce is calculated. Cleared and the abnormality determination in the predetermined rotation speed period ends.

  Subsequently, when a predetermined start condition is established at time t3 and the starter motor 33 is driven while the transmission 32 is in the neutral state, an abnormality determination in the start period is executed. Here, when the pulse signal Sp having the predetermined width β is detected at time t4, the abnormality counter Ce is incremented and the cut flag Fc is set to ON. When the abnormality counter Ce is incremented and the abnormality counter Ce becomes larger than the threshold value K2 within the starting period at time t5, the abnormality flag Fe is set ON, and the reverse rotation corresponding flag Fg and the cut flag Fc are turned OFF. Is set. Further, as shown in FIG. 9, the crank counter Cc is cleared after the cam position sensor 43 detects the reference rotational position.

  Here, the change of the crank counter Cc before and after the abnormality of the crank position sensor 42 is detected will be described in detail. At the time t5, the crank counter Cc is temporarily set to an abnormal value (for example, a negative crank angle), and the crank counter Cc is cleared (Cc ← 0) after the cam position sensor 43 detects the reference rotational position. The Thereafter, since the reverse rotation corresponding flag Fg is set to OFF, the crank counter Cc is incremented on the assumption that the crankshaft 31 is rotating forward regardless of the pulse width of the pulse signal Sp. Based on this, the fuel injection timing and ignition timing for each cylinder 12 are set appropriately, and the internal combustion engine 11 is reliably restarted. Then, when the starter motor 33 stops at time t6, the abnormality determination in the start period ends.

As described above, according to the present embodiment, the following effects can be obtained.
(1) When the ECU 41 detects a pulse signal Sp having a pulse width different from the predetermined width α corresponding to the forward rotation of the crankshaft 31 within a determination period in which the crankshaft 31 is only rotating forward, the crank position sensor 42 Was determined to be abnormal. Therefore, for example, when the pulse signal Sp having a predetermined width β corresponding to the reverse rotation is output although the crankshaft 31 is rotating forward, the pulse width corresponding to the actual rotation direction of the crankshaft 31 is An abnormality such as the output of a pulse signal Sp having a different pulse width can be detected.

  (2) The ECU 41 counts the number of times of abnormality detection in which the pulse signal Sp having a pulse width different from the pulse width corresponding to the forward rotation of the crankshaft 31 is detected within the determination period, and the number of times of abnormality detection sets the threshold values K1 and K2. When exceeded, the crank position sensor 42 is determined to be abnormal. Therefore, for example, when the pulse width of the pulse signal Sp accidentally becomes a pulse width corresponding to the reverse rotation due to the influence of noise or the like, the ECU 41 is prevented from erroneously determining that the crank position sensor 42 is abnormal. it can.

(3) The ECU 41 sets the start period as a period in which the starter motor 33 is in the driving state and the transmission 32 is in the neutral state.
Here, for example, if the driver does not step on the brake pedal when restarting on an uphill road, the vehicle may move backward due to its own weight. Thus, if the transmission 32 is not in the neutral state when the vehicle moves backward due to its own weight, the crankshaft 31 rotates in the reverse direction. In this respect, in the present embodiment, since the starter motor 33 is driven and the transmission 32 is in the neutral state as the start period, the start period is the period during which the crankshaft 31 is only positively rotated. The determination period can be set, and the ECU 41 can be prevented from erroneously determining that the crank position sensor 42 is abnormal.

(4) The threshold value K1 in the predetermined rotation speed period is set larger than the threshold value K2 in the starting period.
Here, as the values of the threshold values K1 and K2 are increased, the accuracy of determining whether or not the crank position sensor 42 is abnormal can be improved, but the time until determining that the crank position sensor 42 is abnormal increases. If the crank position sensor 42 is abnormal, fail-safe processing cannot be executed promptly, and the starting time may be prolonged at the time of starting. In this regard, according to the present embodiment, the threshold value K1 in the predetermined rotation speed period is set to be larger than the threshold value K2 in the start period, so that the abnormality of the crank position sensor 42 can be accurately determined in the predetermined rotation speed period. At the same time, during the start-up period, it is possible to quickly determine an abnormality and execute fail-safe processing, thereby preventing an increase in start-up time.

  (5) When the ECU 41 detects an abnormality in the crank position sensor 42 within the overlap period of the start period and the reverse rotation corresponding period, the ECU 41 clears the crank counter Cc, and then ends the reverse rotation corresponding period to generate the pulse signal Sp. Assuming that the crankshaft 31 is rotating forward regardless of the pulse width, the crank counter Cc is increased or decreased based on the output of the pulse signal Sp.

  Here, within the overlap period of the start period and the reverse rotation corresponding period, the crankshaft 31 normally rotates in the normal direction, but the pulse signal Sp having the predetermined width β is detected within the same period due to the abnormality of the crank position sensor 42. In this case, the crank angle CA is erroneously returned to the retard side, and the crank angle CA becomes inaccurate. Here, if the crank counter Cc is only cleared, the crank angle CA is erroneously returned to the retard side, which is inaccurate.

  In this regard, in the present embodiment, when an abnormality of the crank position sensor 42 is detected, after the crank counter Cc is cleared, the reverse rotation corresponding period is ended and the crankshaft 31 is independent of the pulse width of the pulse signal Sp. As a result, the crank counter Cc is increased or decreased. For this reason, an abnormality of the crank position sensor 42 is detected within the overlap period, in which the pulse signal output timing is normal but a pulse signal Sp having a pulse width different from the pulse width indicating the actual rotation direction is output. Even in this case, the internal combustion engine 11 can be reliably restarted.

  (6) The ECU 41 stops the fuel injection and ignition to the internal combustion engine 11 when detecting a pulse signal Sp having a pulse width different from the pulse width corresponding to the forward rotation of the crankshaft 31 within the overlap period. .

  Here, when an abnormality occurs in the crank position sensor 42 within the overlap period of the start period and the reverse rotation corresponding period, the period from the occurrence of the abnormality of the crank position sensor 42 to the determination is an incorrect crank angle. Fuel injection and ignition to the internal combustion engine 11 are performed based on CA. In this regard, according to the present embodiment, when the pulse signal Sp having a pulse width different from the predetermined width α is detected within the overlap period, the fuel injection and ignition to the internal combustion engine 11 are stopped. Therefore, it is possible to prevent the internal combustion engine 11 from being damaged due to fuel injection and ignition based on the wrong crank angle CA.

(7) The ECU 41 prohibits execution of the automatic stop / restart control when the abnormality of the crank position sensor 42 is detected within the determination period.
Here, in a state where a pulse signal Sp having a pulse width different from the predetermined width α is output when the crankshaft 31 is rotating forward due to an abnormality in the crank position sensor 42, the calculation is based on the pulse signal Sp. The crank angle CA when the internal combustion engine is stopped may be inaccurate. For this reason, when the vehicle is restarted, fuel injection, ignition, or the like is performed based on the wrong crank angle CA, which may cause problems such as poor starting.

  In this regard, according to the present embodiment, when the abnormality of the crank position sensor 42 is detected, the execution of the automatic stop / restart control is prohibited, so that the internal combustion engine 11 is restarted based on the wrong crank angle CA. Can be prevented.

In addition, the said embodiment can also be implemented in the following aspects which changed this suitably.
In the above embodiment, the predetermined rotation speed period and the start period are set as the determination periods. However, the present invention is not limited to this, and the determination period may be only one of the predetermined rotation speed period and the start period. If an abnormality is detected during the determination period with only the predetermined rotation speed period as the determination period, only fail-safe processing for prohibiting automatic stop / restart control is executed, and only the start period is set as the determination period. When an abnormality is detected, the automatic stop / restart control is prohibited, and a fail-safe process for clearing the crank counter Cc by ending the reverse rotation corresponding period is executed.

  In the above embodiment, the start period is the period in which the starter motor 33 is in the driving state and the transmission 32 is in the neutral state. However, the starter motor 33 is in the driving state and the vehicle speed sensor 47 is not limited thereto. May be a period during which the vehicle is determined to be in a stopped state.

  Here, if the driver does not step on the brake pedal when restarting on the uphill road, the vehicle may move backward due to its own weight, but if the vehicle is in a stopped state, the crankshaft 31 is rotating in reverse. It can be judged that there is no. Accordingly, by setting the period in which the starter motor 33 is driven and the vehicle on which the internal combustion engine 11 is mounted is in the stop state as the start period, the crankshaft 31 can be used even when the transmission 32 is not in the neutral state. However, it is possible to prevent the ECU 41 from erroneously determining that the crank position sensor 42 is abnormal.

  In addition, during the period in which the starter motor 33 is being driven, the crankshaft 31 is normally considered to be rotating in the forward direction. Therefore, the start period may be determined only by the starter motor 33 being in a driving state.

In the above embodiment, the threshold value K1 in the predetermined rotation speed period is larger than the threshold value K2 in the start period, but the present invention is not limited to this, and the threshold value K1 may be a value equal to or less than the threshold value K2.
In the above embodiment, the abnormality determination of the crank position sensor 42 is performed by comparing the value of the abnormality counter Ce indicating the number of abnormality detections with the threshold values K1 and K2. However, the present invention is not limited to this, and an abnormality in the pulse signal Sp is detected. Then, the crank position sensor 42 may be immediately determined to be abnormal.

  In the above embodiment, when the timer 64 provided in the crank position sensor 42 fails and the crankshaft 31 is rotating forward, the pulse width of the pulse signal Sp indicates the predetermined width β indicating reverse rotation of the crankshaft 31. However, the present invention is not limited to this. As long as the pulse signal Sp having a pulse width different from the pulse width indicating the actual rotation direction of the crankshaft 31 is output from the crank position sensor 42, the abnormality can be detected even in other modes.

  For example, as shown in FIG. 10, when the voltage level of the sub signal Ss is fixed to the H level due to the abnormality of the sub sensor 62, the sub signal Ss is both at the falling edge and the rising edge of the main signal Sm. Therefore, the pulse signal Sp is output with pulses having a predetermined width α and a predetermined width β alternately. In the case where it is not the reverse rotation corresponding period, as shown in FIG. 10, the crank counter Cc increases every time the pulse signal Sp is output, and the value becomes inaccurate. Even in such an abnormality, when the pulse signal Sp as described above is output within the predetermined rotation speed period or the start period, and the number of detections of the pulse having the predetermined width β exceeds the threshold values K1, K2, It can be detected that an abnormality has occurred in the crank position sensor 42.

  In the above embodiment, the pulse width of the pulse signal Sp is changed according to the rotation direction of the crankshaft 31. However, the present invention is not limited to this, and for example, the voltage of the pulse signal Sp is changed according to the rotation direction of the crankshaft 31. You may make it change other output aspects, such as a level. Also in this case, as in the present embodiment, it is determined that the crank position sensor 42 is abnormal when a pulse signal Sp having an output mode different from the output mode indicating the normal rotation is detected within the determination period.

  DESCRIPTION OF SYMBOLS 11 ... Internal combustion engine, 12 ... Cylinder, 13 ... Piston, 14 ... Combustion chamber, 15 ... Fuel injection valve, 16 ... Spark plug, 21 ... Intake passage, 22 ... Intake valve, 23 ... Exhaust passage, 24 ... Exhaust valve, 26 Intake camshaft, 27 Exhaust camshaft, 31 Crankshaft, 32 Transmission, 33 Starter motor, 41 ECU (electronic control unit), 42 Crank position sensor, 43 Cam position sensor, 44 Shift Position sensor, 45 ... Accelerator position sensor, 46 ... Brake sensor, 47 ... Vehicle speed sensor, 51 ... Signal rotor, 52 ... Teeth, 53 ... Missing tooth part, 61 ... Main sensor, 62 ... Sub sensor, 63 ... Processing device, 64 ... Timer.

Claims (10)

In an abnormality detection device for a rotation sensor that outputs a pulse signal with a different output mode depending on the rotation direction each time the output shaft of the internal combustion engine rotates by a predetermined angle,
Determination means for determining that the rotation sensor is abnormal when a pulse signal having an output mode different from the output mode corresponding to the positive rotation of the output shaft is detected within a determination period in which the output shaft is only rotating forward. An abnormality detection device for a rotation sensor, comprising: In the rotation sensor abnormality detection device according to claim 1,
The determination means counts the number of times of abnormality detection in which a pulse signal having an output mode different from the output mode corresponding to the forward rotation of the output shaft within the determination period is detected, and when the number of times of abnormality detection exceeds a threshold value, An abnormality detection device for a rotation sensor, wherein the rotation sensor is determined to be abnormal. In the rotation sensor abnormality detection device according to claim 1 or 2,
The abnormality detection device for a rotation sensor, wherein the determination means sets a predetermined rotation speed period in which the rotation speed of the output shaft is equal to or higher than a lower limit rotation speed at which the output shaft does not reversely rotate as the determination period. In the rotation sensor abnormality detection device according to any one of claims 1 to 3,
The abnormality detection device for a rotation sensor, wherein the determination means sets a start period in which a starter motor that rotates the output shaft in a normal direction when the internal combustion engine is started is in the drive state. In the rotation sensor abnormality detection device according to claim 2,
The determination means includes a predetermined rotational speed period in which the rotational speed of the output shaft is equal to or higher than a lower limit rotational speed at which the reverse rotation of the output shaft does not occur, and a starter motor that normally rotates the output shaft when the internal combustion engine is started. Each starting period is set as the determination period,
The abnormality detection device for a rotation sensor, wherein the threshold value is set so that a value in the predetermined rotation speed period is larger than a value in the start period. In the rotation sensor abnormality detection device according to claim 4 or 5,
An abnormality detection device for a rotation sensor, wherein, in addition to the starter motor being in a driving state, a period in which the transmission connected to the internal combustion engine is in a neutral state in which power transmission is interrupted is defined as the start period. In the rotation sensor abnormality detection device according to claim 4 or 5,
An abnormality detection device for a rotation sensor, wherein, in addition to the starter motor being in a driving state, a period in which a vehicle on which the internal combustion engine is mounted is in a stopped state is defined as the start period. The start period overlaps with the reverse rotation corresponding period in which the rotation position of the output shaft is returned to the retard side when the pulse signal of the output mode corresponding to the reverse rotation of the output shaft is detected,
If an abnormality of the rotation sensor is detected within the overlap period of the start period and the reverse rotation corresponding period, the calculated value of the rotation position of the output shaft is cleared, and then the reverse rotation corresponding period is ended and a pulse The rotation angle calculation means for calculating the rotation position of the output shaft based on the output of the pulse signal on the assumption that the output shaft is rotating forward regardless of the signal output mode. The rotation sensor abnormality detection device according to claim 1. 9. A stop means for stopping fuel injection and ignition to the internal combustion engine when a pulse signal having an output mode different from an output mode corresponding to a positive rotation of the output shaft is detected within the overlap period. An abnormality detection device for a rotation sensor according to claim 1. Control means for automatically stopping the internal combustion engine when a predetermined stop condition is satisfied, and performing automatic stop / restart control for automatically starting the internal combustion engine when a predetermined restart condition is satisfied;
An abnormality of the rotation sensor according to any one of claims 2 to 9, further comprising prohibiting means for prohibiting execution of the automatic stop / restart control when an abnormality of the rotation sensor is detected within the determination period. Detection device.

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