JP2005055289A - Apparatus and method for determining anomaly - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent erroneous determination on anomalies of a sensor for detecting the rotational position of an output shaft of an internal combustion engine. <P>SOLUTION: After the number NE of revolutions of the engine reaches a predetermined number Neref of revolutions or higher, and a value of an increment counter B exceeds a threshold value T1ref, in other words, after a period of time sufficient for masking noise has elapsed, anomalies of the sensor are determined on the basis of a value of an increment counter A (S150-180). Since anomalies of the sensor are therefore not determined until the period of time sufficient for masking noise has elapsed even when the number NE of revolutions of the engine reaches the predetermined number Neref of revolutions or higher, it is possible to prevent erroneous determination on anomalies based on erroneous operation on the number NE of revolutions of the engine due to noise. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an abnormality determination device and an abnormality determination method, and more particularly to an abnormality determination device and an abnormality determination method for determining an abnormality of a rotational position detection sensor that detects a rotational position of an output shaft of an internal combustion engine.

Conventionally, as this kind of abnormality determination device, after the ignition key switch is turned on and the battery voltage rises to a first predetermined voltage or higher, the starter motor is started to change the battery voltage to the first predetermined voltage. There has been proposed a method for starting the determination of abnormality of the crank angle sensor after the voltage falls below a lower second predetermined voltage (see Patent Document 1). In this apparatus, a predetermined time has elapsed since the crankshaft of the internal combustion engine is reliably rotated based on a signal from an ignition key, a signal from a sensor for detecting battery voltage, a signal from a crank angle sensor, or the like. The crank angle sensor is judged to be abnormal based on the fact that no signal is input from the crank angle sensor.
JP-A-5-321745 (FIG. 3)

  However, in the above-described abnormality determination device, it is necessary to input an ON signal from the ignition key, a signal from the sensor for detecting the battery voltage, a signal from the crank angle sensor, and the like, so the device has a complicated configuration. In order to achieve a simple configuration, it may be possible to determine the abnormality of the sensor only by a signal from the crank angle sensor. In this case, however, the sensitivity of the sensor is increased from the viewpoint of ensuring startability, and the internal combustion engine Since the number of revolutions is calculated based on a signal from the sensor, an erroneous determination often occurs in determining whether the internal combustion engine is rotating or determining a sensor abnormality due to noise generated in an input line from the sensor. Such misjudgment is based on the calculation of the rotational speed of the internal combustion engine when noise occurs, using the noise as a signal from the sensor. That is, there is a case in which it is determined that the sensor is abnormal due to noise because the internal combustion engine is not rotating due to noise. Such misjudgment based on noise is often caused in a hybrid vehicle that can travel with the power from the motor while the internal combustion engine is stopped because the noise is generated by applying a relatively large voltage.

  An object of the abnormality determination device and the abnormality determination method of the present invention is to determine abnormality of a sensor that detects the rotational position of the output shaft of an internal combustion engine with a simpler configuration. Another object of the abnormality determination apparatus and abnormality determination method of the present invention is to prevent erroneous determination of abnormality of a sensor that detects the rotational position of the output shaft of an internal combustion engine.

  The abnormality determination device and abnormality determination method of the present invention employ the following means in order to achieve at least a part of the above object.

The abnormality determination device of the present invention is
An abnormality determination device that determines an abnormality of a rotational position detection sensor that is attached to an output shaft of an internal combustion engine and detects a rotational position of the output shaft,
Signal input means for inputting a signal for detecting the rotational position detected by the rotational position detection sensor;
A rotation speed calculation means for calculating the rotation speed of the internal combustion engine based on the input signal;
No signal is input by the signal input means for a second predetermined time after the first predetermined time has elapsed after the calculated rotation speed reaches the predetermined rotation speed and continues at the predetermined rotation speed or higher. An abnormality determination means for determining an abnormality of the rotational position detection sensor based on a signal immediately before input by the signal input means;
It is a summary to provide.

  In the abnormality determination device of the present invention, after the first predetermined time has elapsed after the rotation speed of the internal combustion engine reaches the predetermined rotation speed, the rotation position detection sensor continues for the second predetermined time. When no signal is input from, an abnormality of the rotational position detection sensor is determined based on the signal immediately before the input. Therefore, even if the rotational speed of the internal combustion engine reaches the predetermined rotational speed, the abnormality is not determined until the first predetermined time elapses. Therefore, even if the rotational speed of the internal combustion engine is calculated by noise, it is based on the rotational speed. Therefore, no abnormality is judged. As a result, erroneous determination due to noise can be suppressed. Of course, since the abnormality of the sensor is determined only by the signal from the rotational position detection sensor, the configuration can be made simpler than that in which other signals are also input. Here, the “first predetermined time” may be set as a time necessary for masking the noise, and can be obtained from characteristics of a device on which the internal combustion engine is mounted. Due to the noise generated, the “first predetermined time” is set to, for example, 0.1 seconds or more, 0.2 seconds or more, 0.3 seconds or more, 0.4 seconds or more, 0.5 seconds or more, 0.7 seconds or more, What is necessary is just to set to the suitable time like 1 second or more. Examples of the “abnormality” include wiring inside the rotational position detection sensor and disconnection of wiring from the rotational position detection sensor to the signal input means.

  In such an abnormality determination device of the present invention, the abnormality determination means is means for determining abnormality based on a signal interval between a signal immediately before input by the signal input means and a signal before the previous signal. You can also In the abnormality determination device according to the aspect of the present invention, the abnormality determination unit is configured to detect an abnormality in the rotational position detection sensor when the signal interval is equal to or less than a predetermined signal interval set based on a signal interval corresponding to the predetermined rotation speed. It can also be a means for judging. This is based on determining whether the sensor is abnormal when the internal combustion engine is at a predetermined speed or higher.

The abnormality determination method of the present invention includes:
An abnormality determination method for determining an abnormality of a rotational position detection sensor attached to an output shaft of an internal combustion engine and detecting a rotational position of the output shaft,
(A) A signal for detecting the rotational position detected by the rotational position detection sensor is input,
(B) calculating the rotational speed of the internal combustion engine based on the input signal;
(C) The signal is not input for a second predetermined time after the first predetermined time has elapsed after the calculated rotation speed reaches the predetermined rotation speed and continues at the predetermined rotation speed or higher. The gist is to determine abnormality of the rotational position detection sensor based on a signal interval between a signal immediately before the input and a signal before the previous signal.

  In the abnormality determination method according to the present invention, the rotational position detection sensor continues for a second predetermined time after the first predetermined time has elapsed after the rotational speed of the internal combustion engine reaches the predetermined rotational speed. When no signal is input, the abnormality of the rotational position detection sensor is determined based on the signal interval between the immediately preceding signal input and the previous signal. That is, even if the rotational speed of the internal combustion engine reaches the predetermined rotational speed, the abnormality is not determined until the first predetermined time has elapsed, so even if the rotational speed of the internal combustion engine is calculated by noise, it is based on the rotational speed. Therefore, no abnormality is judged. As a result, erroneous determination due to noise can be suppressed. Of course, since the abnormality of the sensor is determined only by the signal from the rotational position detection sensor, the configuration can be made simpler than that in which other signals are also input.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of an automobile 20 as an embodiment of the present invention. As shown in the figure, the automobile 20 of the embodiment includes an engine 22, a planetary gear mechanism 30 connected to the crankshaft 23 of the engine 22, a motor MG1 capable of generating electricity connected to the planetary gear mechanism 30, and a planetary gear mechanism. 30 and a motor MG2 capable of generating electricity connected to a drive shaft connected to the drive wheels 28a and 28b via a differential gear, and exchanges electric power with the motors MG1 and MG2 via inverters 31 and 32. A battery 27 and an electronic control unit 50 for controlling the entire automobile are provided.

  The engine 22 is an internal combustion engine that outputs power using hydrocarbon fuel such as gasoline or light oil, and various sensors that detect the operating state of the engine 22 such as a rotational position detection sensor 24 that detects the crank position of the crankshaft 23. The operation control such as fuel injection control, ignition control, and intake air amount adjustment control is received by the electronic control unit 50 that receives the signal from Although not shown, the rotational position detection sensor 24 is a crank position sensor that is generally used, that is, a timing rotor integrated with a crankshaft timing pulley attached to the crankshaft 23 and having 12 teeth, and a timing rotor. And a coil for generating an electromotive force based on a change in magnetic force. The rotation position detection line sensor 24 outputs a pulse signal based on electromagnetic action every time the crankshaft 23 rotates 30 degrees because the timing rotor has 12 teeth.

  Motors MG1 and MG2 are configured as well-known synchronous generator motors that function as electric motors as well as generators, and from various sensors such as a rotational position detection sensor (not shown) that detects the rotational positions of the rotors of motors MG1 and MG2. The drive control is performed via the inverters 31 and 32 by the electronic control unit 50 to which the above signal is input.

  The electronic control unit 50 is configured as a microprocessor centered on the CPU 52, and includes a ROM 54 that stores a processing program in addition to the CPU 52, a RAM 56 that temporarily stores data, and an input / output port (not shown). The electronic control unit 50 detects the rotational position θ from the rotational position detection sensor 24, the ignition signal from the ignition switch 40, the vehicle speed V from the vehicle speed sensor 48 that detects the traveling speed of the automobile 20, and the operation position of the shift lever 41. The shift position SP from the shift position sensor 42, the accelerator opening Acc from the accelerator pedal position sensor 44 that detects the depression amount of the accelerator pedal 43, and the brake pedal from the brake pedal position sensor 46 that detects the depression amount of the brake pedal 45 A position BP or the like is input via the input port. In addition, the electronic control unit 50 outputs a control signal to each part that operates the engine 22, a switching control signal to the inverters 31 and 32, a lighting signal to the warning lamp 49, and the like through an output port.

  The vehicle 20 according to the embodiment thus configured calculates a required torque to be output to the drive shaft based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 83 by the driver, The engine 22, the motor MG1, and the motor MG2 are operation-controlled so that the corresponding required power is output to the drive shaft. As operation control of the engine 22, the motor MG1, and the motor MG2, the operation of the engine 22 is controlled so that power corresponding to the required power is output from the engine 22, and all of the power output from the engine 22 is transmitted to the planetary gear mechanism 30. Torque conversion by the motors MG1 and MG2 and output to the drive shaft. Torque conversion operation mode for driving and controlling the motors MG1 and MG2 and the power required for the sum of the required power and the power required for charging and discharging the battery 27 Is controlled by the planetary gear mechanism 30, the motor MG1, and the motor MG2. All or part of the motive power output from the engine 22 with charge / discharge of the battery 27 is controlled by the planetary gear mechanism 30, the motor MG1, and the motor MG2. Motor MG1 and motor MG1 are output so that the required power is output to the drive shaft with torque conversion. Charge-discharge drive mode controls the driving of the motor MG2, there is a motor operation mode in which operation control to output a power to stop the operation of the engine 22 meets the required power from the motor MG2 to the drive shaft.

  Next, the operation of the automobile 20 configured as described above, particularly the operation of determining abnormality of the rotational position detection sensor 24 that detects the rotational position of the crankshaft 23 of the engine 22 will be described. FIG. 2 is a flowchart illustrating an example of an abnormality determination routine executed by the electronic control unit 50 of the automobile 20 according to the embodiment. This routine is repeatedly executed every predetermined time (for example, every 0.8 msec).

  When the abnormality determination routine is executed, the CPU 52 of the electronic control unit 50 first increments the increment counters A and B by 1 (step S100). Here, although the increment counters A and B will be described later with respect to essential functions, they are counters used for determining abnormality of the rotational position detection sensor 24. In the embodiment, the ignition signal from the ignition switch 40 is turned on. The value 0 is set as an initial value by an initialization routine (not shown).

  Next, it is determined whether or not there is an input of a signal from the rotational position detection sensor 24 that detects the rotational position of the crankshaft 23 (step S110). As a result, when it is determined that a signal is input from the rotational position detection sensor 24, the value of the signal interval Tp is updated by substituting the value of the increment counter A into the signal interval Tp (step S120) and set. The rotational speed Ne of the engine 22 is calculated based on the signal interval Tp (step S130), and the value of the increment counter A is reset to the initial value 0 (step S140). On the other hand, if it is determined in step S110 that no signal is input from the rotational position detection sensor 24, the process proceeds to step S150 without updating the value of the signal interval Tp and the value of the engine 22 rotational speed Ne.

  The rotational speed Ne of the engine 22 currently used is equal to or greater than the predetermined rotational speed Neref, the signal interval Tp is less than the threshold value Tref, the increment counter A exceeds the threshold value T2ref, and the increment counter It is determined whether or not B exceeds the threshold value T1ref (steps S150 to S180). When all the conditions are satisfied, it is determined that an abnormality has occurred in the rotational position detection sensor 24 and the warning lamp 49 is turned on. This routine is finished (steps S190 and S200). On the other hand, when any of the above-mentioned conditions is not satisfied, this routine is terminated without performing abnormality determination. Here, the predetermined rotational speed Neref is used for determining that the engine 22 is started, and for example, a value such as 400 rpm, 500 rpm, or 600 rpm can be used. The threshold value Tpref is used to determine whether the engine 22 is operating stably, and is a counter value corresponding to the signal interval input from the sensor when the engine speed is slightly higher than the predetermined engine speed Neref. Is set. The threshold value T2ref is set to determine abnormality of the rotational position detection sensor 24, and is based on a counter value corresponding to a signal interval input from the sensor when the engine 22 is rotating at a predetermined rotational speed Neref. Set as a large value. The threshold T1ref is set to prevent erroneous determination of sensor abnormality due to noise, and is set as a time sufficiently longer than the time obtained by adding the threshold T2ref for determining sensor abnormality to the duration of noise. The threshold value T1ref is set to, for example, 0.1 second, 0.2 second, 0.3 second, 0.4 second, 0.5 second, 0 according to the noise generated by driving the equipment included in the mounted vehicle. .7 seconds, 1 second, etc.

  Determination of abnormality of the rotational position detection sensor 24 will be described. The sensor abnormality based on the disconnection of the internal line of the sensor or the disconnection of the signal line from the sensor basically means that the increment counter A is set to the predetermined rotational speed Neref when the rotational speed Ne of the engine 22 is equal to or higher than the predetermined rotational speed Neref. A determination can be made based on exceeding the threshold value T2ref set to a value larger than the corresponding count value (steps S150 and S170). That is, the determination is made when the pulse signal from the sensor that should be inputted every 30 degrees as the rotation angle of the crankshaft 23 is cut off even though the engine 22 is rotating at a predetermined rotation speed Neref or more. In the embodiment, in order to appropriately determine such an abnormality, the signal interval Tp is a value smaller than a threshold value Tpref that is a counter value corresponding to the signal interval when the engine 22 is operated more stably. A condition that the increment counter B is larger than the threshold value T1ref set for masking noise is added (steps S160 and S180). Among these, the latter condition for masking the noise is to calculate the rotational speed Ne of the engine 22 using the noise as a signal from the rotational position detection sensor 24, and even if the signal is interrupted thereafter, this causes a sensor based on disconnection. This is to prevent the abnormality from being determined. In the embodiment, in order to properly execute the condition for masking this noise, when the rotational speed Ne of the engine 22 is less than the predetermined rotational speed Neref in step S150, the increment counter B is cleared to 0 (step S210). . Further, even if the increment counter A is larger than the threshold value T2ref when the rotational speed Ne of the engine 22 is equal to or larger than the predetermined rotational speed Neref, when the increment counter B is equal to or smaller than the threshold value T1ref, it is determined that this sensor abnormality is caused by noise. Thereafter, in order to prevent the increment counter B from exceeding the threshold value T1ref and making an erroneous determination, a value 0 is set to the rotational speed Ne of the engine 22 (step S220).

  FIG. 3 is an explanatory diagram for explaining a state in which an abnormality of the rotational position detection sensor 24 is determined. When there is a signal input due to noise at time T1, the rotational speed Ne of the engine 22 is calculated accordingly, and the increment counters A and B are also reset and incremented. At time T2 when the signal input due to noise is interrupted and the increment counter A exceeds the threshold value T2ref, the increment counter B is equal to or less than the threshold value T1ref, so that it is determined as an erroneous determination, and a value 0 is set to the rotational speed Ne of the engine 22 (step As a result, the value of the increment counter B is also cleared (step S210). Therefore, when a signal is input due to noise, sensor abnormality is not determined and the warning lamp 49 is not lit. On the other hand, when the engine 22 is started and the sensor input is interrupted at time T4 after time T3 when the increment counter B exceeds the threshold T1ref after the rotation speed Ne becomes equal to or higher than the predetermined rotation speed Neref, the increment counter A decreases the threshold T2ref. Since the increment counter B is larger than the threshold value T1ref at the time T5, the sensor abnormality is determined (step S190), and the warning lamp 49 is turned on (step S200).

  According to the automobile 20 of the embodiment described above, even if the rotational speed Ne of the engine 22 is equal to or higher than the predetermined rotational speed Neref, an abnormality of the rotational position detection sensor 24 is not performed until a sufficient time has passed to mask noise. Therefore, it is possible to suppress erroneous determination of abnormality based on noise. In addition, since the abnormality of the rotational position detection sensor 24 is determined while the engine 22 is stably operated, more appropriate abnormality determination can be performed. Of course, since the sensor abnormality is determined only by inputting the signal from the rotational position detection sensor 24, the configuration can be simplified as compared with the case where the sensor abnormality is determined by inputting another signal.

  In the automobile 20 of the embodiment, the abnormality of the rotational position detection sensor 24 is determined while the engine 22 is stably operated. However, after the rotational speed Ne of the engine 22 becomes equal to or higher than the predetermined rotational speed Neref. The sensor abnormality may be determined regardless of whether or not the engine 22 is stably operated as long as a sufficient time has passed for masking the noise.

  In the automobile 20 of the embodiment, the warning lamp 49 is turned on when a sensor abnormality is determined. However, the warning may be issued by other methods such as warning by a warning sound, or may not be given.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention is applicable to the automobile industry.

It is a block diagram which shows the outline of a structure of the motor vehicle 20 which is one Example of this invention. It is a flowchart which shows an example of the abnormality determination routine performed by the electronic control unit 50 of the motor vehicle 20 of an Example. It is explanatory drawing explaining a mode that abnormality of the rotational position detection sensor 24 is determined.

Explanation of symbols

20 automobile, 22 engine, 23 crankshaft, 24 rotational position detection sensor, 27 battery, 28a, 28b drive wheel, 30 planetary gear mechanism, 31, 32 inverter, 41 shift lever, 42 shift position sensor, 43 accelerator pedal, 44 accelerator Pedal position sensor, 45 Brake pedal, 46 Brake pedal position sensor, 48 Vehicle speed sensor, 49 Warning lamp, 50 Electronic control unit, 52 CPU, 54 ROM, 56 RAM, MG1, MG2 motor.

Claims (7)

An abnormality determination device that determines abnormality of a rotational position detection sensor that is attached to an output shaft of an internal combustion engine and detects a rotational position of the output shaft,
Signal input means for inputting a signal for detecting the rotational position detected by the rotational position detection sensor;
A rotation speed calculation means for calculating the rotation speed of the internal combustion engine based on the input signal;
No signal is input by the signal input means for a second predetermined time after the first predetermined time has elapsed after the calculated rotation speed reaches the predetermined rotation speed and continues at the predetermined rotation speed or higher. An abnormality determination means for determining an abnormality of the rotational position detection sensor based on a signal immediately before input by the signal input means;
An abnormality determination device comprising: 2. The abnormality determination device according to claim 1, wherein the abnormality determination unit is a unit that determines wiring inside the rotational position detection sensor and / or disconnection of wiring from the rotational position detection sensor to the signal input unit. The abnormality determination device according to claim 1, wherein the first predetermined time is 0.1 second or more. The abnormality determination device according to claim 1 or 2, wherein the first predetermined time is 0.5 seconds or more. 5. The abnormality determination according to claim 1, wherein the abnormality determination unit is a unit that determines abnormality based on a signal interval between a signal immediately before input by the signal input unit and a signal before the previous signal. apparatus. The abnormality determination unit is a unit that determines an abnormality of the rotational position detection sensor when the signal interval is equal to or less than a predetermined signal interval set based on a signal interval corresponding to the predetermined rotation speed. Abnormality judgment device. An abnormality determination method for determining an abnormality of a rotational position detection sensor attached to an output shaft of an internal combustion engine and detecting a rotational position of the output shaft,
(A) A signal for detecting the rotational position detected by the rotational position detection sensor is input,
(B) calculating the rotational speed of the internal combustion engine based on the input signal;
(C) The signal is not input for a second predetermined time after the first predetermined time has elapsed after the calculated rotation speed reaches the predetermined rotation speed and continues at the predetermined rotation speed or higher. An abnormality determination method of determining abnormality of the rotational position detection sensor based on a signal interval between a signal immediately before input and a signal before the previous signal.

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