JP2000205026A - Information processor and engine control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a problem caused by processing based on an abnormal rotational angle signal, by determining whether or not the rotational angle signal output in a stopping state of an internal combustion engine. SOLUTION: In a first method, when only rotational angle signal is output from an NE sensor 31 and to reference signal is output from a G sensor 33, processing based on the rotational angle signal is prohibited. In a second method, a rotation direction of an output shat 1a of an engine 1 is determined based on the rotational angle signal output from the NE sensor 31 or the reference signal output from the G sensor 33. If the rotational angle signal is output, the processing based on the rotational angle signal is prohibited when it is determined that the output shaft 1a of the engine 1 is in reverse rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for controlling an internal combustion engine of a hybrid vehicle, and more particularly to a technique for controlling the internal combustion engine of a hybrid vehicle that stops operating under a predetermined condition.

[0002]

2. Description of the Related Art Conventionally, a vehicle travels by transmitting rotation output generated by an internal combustion engine to wheels (drive wheels). However, since noise and exhaust gas are generated,
2. Description of the Related Art There has been proposed an electric vehicle that runs using a motor as a driving power source.

[0003] However, electric vehicles have a drawback that their cruising distance is short because they use only the electric power that has been charged to a battery in advance. Therefore, in recent years, an internal combustion engine and a motor have been used together. Hybrid vehicles have attracted attention. Various types of hybrid vehicles of this type have been proposed. The internal combustion engine drives the generator, the generated electric power rotates the motor, and the rotation output of the motor is transmitted to the wheels, so that only the driving of the generator used for the internal combustion engine to rotate the motor is performed. A series type in which the wheels are driven only by the performing motor or a parallel type in which the driving force is applied to the wheels by both the internal combustion engine and the motor, and further, the output of the internal combustion engine, according to the running state of the vehicle, There is a parallel series type which is used only for driving a generator for a motor or used for driving wheels together with the output of a motor.

In such a hybrid vehicle, the operation of the internal combustion engine is stopped during a period in which the driving of the generator or the driving of the wheels for rotating the motor by the internal combustion engine is not particularly required, thereby generating noise and exhaust gas. It is conceivable to suppress. For example, Japanese Unexamined Patent Publication No. 9-322305 discloses a technology relating to a hybrid vehicle running in various operation modes, in which a time lag from the stop of the operation of the internal combustion engine to the start of the internal combustion engine is supplemented by the output of the motor. I have. That is, the hybrid vehicle disclosed herein is an example in which the operation of the internal combustion engine is stopped according to the operation mode.

[0005] Such operation control of the internal combustion engine is performed by a control device for the internal combustion engine called an engine ECU (hereinafter referred to as an "engine control device").
This engine control device, based on a rotation angle signal and a reference signal output in synchronization with the rotation of the output shaft of the internal combustion engine,
Generally, a fuel injection process and a fuel ignition process are executed. The rotation angle signal is a signal output to grasp the rotation angle of the output shaft of the internal combustion engine, and is usually called a ne signal. The reference signal indicates a reference position of the output shaft of the internal combustion engine, and is a signal for detecting a deviation of the output shaft (crankshaft), and is usually called a g signal. 2 synchronized with the output shaft of such an internal combustion engine
Generally, a plurality of cylinders of an internal combustion engine are identified based on a signal of the system and ignition processing is performed. In addition, Japanese Patent No. 2744
Japanese Patent Application Publication No. 627 also discloses a technique for performing ignition processing by identifying a plurality of cylinders of an internal combustion engine based on a single system rotation angle signal synchronized with the rotation of the output shaft of the internal combustion engine. Further, the engine control device executes not only an ignition process and a fuel injection process, but also a predetermined diagnosis process (hereinafter, referred to as “diag”) based on the rotation angle signal.

As described above, the engine control device executes a predetermined process based on the rotation angle signal output in synchronization with the rotation of the output shaft of the internal combustion engine. Therefore, when starting the internal combustion engine from the operation stop state of the internal combustion engine, the operation control by the engine control device is started by rotating the output shaft by, for example, a starter and forcibly generating a rotation angle signal.

[0007]

By the way, even when the operation of the internal combustion engine is stopped, the output shaft of the internal combustion engine is slightly moved in the forward direction (the direction rotating during operation of the internal combustion engine) and in the reverse direction due to the vibration of the vehicle or the like. If the output shaft is alternately rotated at an appropriate rotation angle, or if the output shaft is connected to a generator or the like, there is a possibility that the motor is reversely rotated by a load from the connected generator or the like.

The rotation angle signal synchronized with the rotation of the output shaft is transmitted through a window provided on a disk which rotates in synchronization with the rotation of the output shaft as disclosed in Japanese Patent No. 2744627, for example. Detected by the sensor of
It is obtained by detecting protrusions provided at predetermined intervals around a disk that rotates in conjunction with the rotation of the output shaft with an electromagnetic sensor.

Therefore, when the output shaft rotates alternately in the forward direction and the reverse direction, even if the rotation angle is very small, if the window or the projection provided on the above-mentioned disk exists near the sensor, the output shaft is as if it were. A rotation angle signal is generated as if rotating. Also, when the output shaft rotates reversely due to, for example, a load from a generator, a rotation angle signal is generated as if the output shaft were rotating normally. That is, there is a possibility that a rotation angle signal (abnormal rotation angle signal) is generated even though the internal combustion engine is not in the operating state or the starting state.

However, the control device of the internal combustion engine uniformly executes processing based on the rotation angle signal without distinguishing between normal and abnormal rotation angle signals. The reason is that, unless the vehicle is a hybrid type vehicle, there is no concept of stopping the operation of the internal combustion engine during traveling, and no abnormal rotation angle signal is generated.

If the processing based on such an abnormal rotation angle signal is executed, the following inconveniences will occur. That is, if the diagnosis is performed, an erroneous diagnosis may be performed. Examples of this diagnostic include a disconnection diagnostic of an air flow meter which is a sensor for detecting an amount of air taken into an internal combustion engine, a diagnostic of an oxygen sensor for detecting an oxygen concentration in exhaust gas, a diagnostic of a knock sensor which is a kind of vibration pickup, A water temperature sensor diagnostic or the like can be considered. In these diagnostics, the operation of the internal combustion engine is assumed to be a condition. However, in practice, an accurate diagnosis is not made because the internal combustion engine is in an operation stop state. Further, for example, if the fuel injection processing, the ignition processing, and the like are performed in a state where the output shaft of the internal combustion engine is rotated in the reverse direction, the internal combustion engine may be destroyed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is determined whether or not a rotation angle signal output in an operation stop state of an internal combustion engine is abnormal.
An object is to prevent a problem caused by a process based on an abnormal rotation angle signal.

[0013]

The information processing apparatus of the present invention is used in a hybrid vehicle having both an internal combustion engine and a motor. Here, a hybrid type vehicle having both an internal combustion engine and a motor includes a series type hybrid vehicle that uses only a motor as a driving power source and is used to drive a generator that generates electric power for rotating the internal combustion engine. Includes parallel type and parallel series type hybrid vehicles that use both a motor and an internal combustion engine as a driving power source. Further, the hybrid vehicle here stops the operation of the internal combustion engine under predetermined conditions. The predetermined condition corresponds to, for example, a case where the battery is sufficiently charged by the generator if the internal combustion engine is a hybrid vehicle that is used to drive only the generator. Also, a hybrid vehicle using both a motor and an internal combustion engine as a driving power source corresponds to, for example, a case where the vehicle is in a running state in which a sufficient driving force can be obtained with only the output of the motor.

The rotation angle signal output from the rotation position detecting means and the reference signal output from the reference position detecting means are input to the information processing apparatus of the present invention. The rotational position detecting means detects that the output shaft of the internal combustion engine has reached a plurality of predetermined rotational positions set for one rotation of the output shaft. On the other hand, the reference position detecting means detects that the rotational position of the output shaft of the internal combustion engine has reached a reference position set for one rotation of the output shaft. The reference position is set at an interval wider than the interval between predetermined rotation positions at which the rotation angle signal is output. Thus, the information processing apparatus is premised on the input of two signals from the outside that are output in synchronization with the rotation of the output shaft of the internal combustion engine.

The information processing device executes a predetermined process based on at least the rotation angle signal. For example, it is conceivable to execute fuel injection control, ignition timing control, and the like for the internal combustion engine based on the rotation angle signal and the reference signal. In addition, it is conceivable to execute various diagnostic processes based on the rotation angle signal. In the fuel injection control and the ignition timing control, a control amount that is a fuel injection amount and an ignition timing is calculated, and the control amount is output to an external fuel injection device or an ignition device.

Here, in order to facilitate understanding of the following description, a specific description will be added to the rotation position detection means and the reference position detection means, and the rotation angle signal and the reference signal output from the respective means. And Specifically, the rotational position detecting means and the reference position detecting means may be electromagnetic sensors which detect protrusions around the disk integrally provided on the crankshaft or the like and output a pulse signal. It is also conceivable to use an optical sensor that detects a window of a disk provided integrally with a crankshaft or the like and outputs a pulse signal as disclosed in Japanese Patent No. 2744627.

The rotation angle signal output from the rotation position detection means is output in synchronization with the rotation of the output shaft of the internal combustion engine, and is called a ne signal. This rotation angle signal is a signal for detecting the rotation angle of the crankshaft, and is output at predetermined rotation positions set at a plurality of locations. For example, 34 for 360 degree rotation of the crankshaft
The rotational positions of the points are set, and the signals are output at the 34 rotational positions. This rotation position corresponds to, for example, a protrusion around the disk provided integrally with the crankshaft. The protrusions around the disk are provided at predetermined angular intervals in principle. However, a missing portion of a protrusion called a chipped tooth is formed around the disk so that the rotation of the crankshaft by 360 degrees can be detected. For example, when numbers 1 to 34 are assigned to the protrusions around the disk, the first, second,
The third,..., And 34th projections are provided continuously every 10 degrees, and the 34th and first projections are provided at intervals of 30 degrees.

On the other hand, the reference signal output from the reference position detecting means is also output in synchronization with the rotation of the output shaft of the internal combustion engine, and is called a g signal. The reference signal is a signal mainly for detecting a shift of the crankshaft, and is output at a predetermined reference position. For example, three reference positions are set for 360-degree rotation of the crankshaft, and output is performed at these three reference positions. This reference position also corresponds to, for example, a protrusion around the disk provided integrally with the crankshaft or the like.

Here, in particular, in the information processing apparatus of the present invention,
When only the rotation angle signal is output and the reference signal is not output, the abnormality determination unit determines that the output rotation angle signal is abnormal, and determines that the rotation angle signal is abnormal by the abnormality determination unit. If so, the processing prohibiting means prohibits the processing based on the rotation angle signal.

As described above, even if the output shaft rotates alternately in the forward and reverse directions at a small angle due to the vibration of the vehicle even if the internal combustion engine is stopped, as if the output shaft was operating normally. A rotation angle signal is generated as if rotating. Then, predetermined processing is executed based on the rotation angle signal. For example, various diagnostics based on the rotation angle signal are executed. In such a case, inconveniences such as a failure to make a normal diagnosis occur.

Therefore, the present invention focuses on the reference signal output in synchronization with the rotation of the output shaft of the internal combustion engine, similarly to the rotation angle signal. That is, when the output shaft of the internal combustion engine is rotated alternately in the forward direction and the reverse direction at a small angle to output the rotation angle signal, the reference set at a wider interval than the rotation position at which the rotation angle signal is output. There is a high possibility that the reference signal output corresponding to the position is not output. For example, in the above-described example, while the crankshaft rotates 360 degrees, 34 pulses of the rotation angle signal are output, whereas three pulses of the reference signal are output. Assuming that the rotation angle signal and the pulse of the reference signal are output at equal intervals, the reference position is:
This means that the rotation angle signal is set at an interval of ten times or more the rotation position at which the rotation angle signal is output.

For this reason, when only the rotation angle signal is output and the reference signal is not output, an abnormal rotation angle caused by the output shaft of the internal combustion engine rotating alternately in the forward and reverse directions at a small angle. The signal is regarded as a signal and processing based on the rotation angle signal is prohibited. This increases the possibility of avoiding inconvenience due to execution of processing based on an abnormal rotation angle signal generated when the output shaft of the internal combustion engine alternately rotates in the forward and reverse directions at a small angle.

Even when the output shaft of the internal combustion engine rotates alternately in the forward and reverse directions at a small angle, there is a possibility that a reference signal is output if it is before or after the reference position. Therefore, as described in claim 2, the abnormality determination means is provided as follows.
Furthermore, even when the rotation angle signal and the reference signal are output, if at least one of the signals is not output at an appropriate timing, it is determined that the output rotation angle signal is abnormal. It is good to be constituted as follows. "When at least one signal is not output at an appropriate timing" is, for example, a difference between the rotation speed of the internal combustion engine calculated based on the rotation angle signal and the rotation speed of the internal combustion engine calculated based on the reference signal. It is conceivable to determine whether it is within a predetermined range. That is, no matter which signal is used for the calculation, the rotation speed of the internal combustion engine should match within the range of the error. With this configuration, it is possible to reliably determine that the rotation angle signal generated when the output shaft of the internal combustion engine alternately rotates in the forward direction and the reverse direction at a small angle is abnormal. As a result, a process such as a diagnosis based on the rotation angle signal can be prohibited, and the inconvenience associated with the execution of the process can be reliably avoided.

According to a third aspect of the present invention, when the rotation angle signal is not output and only the reference signal is output, the abnormality judging means operates the signal system including the rotation position detecting means abnormally. May be determined. When the reference signal is output, it is considered that the rotation angle signal output at the predetermined rotation position set at a small interval with respect to the reference position is output naturally. Therefore, if only the reference signal is output, it can be estimated that the rotation angle signal is not output due to, for example, disconnection of the sensor or the like, and it can be determined that the rotation angle signal system including the rotation position detecting means is abnormal.

In the present invention, it is determined whether the rotation angle signal output from the rotation position detecting means is normal or abnormal. If the rotation angle signal is abnormal, processing based on the rotation angle signal is prohibited. . Therefore, as described above, when the rotation angle signal system is abnormal, if the rotation angle signal is not output at all, it is not particularly necessary to prohibit the processing based on the rotation angle signal. However, it is also conceivable that a rotation angle signal that is temporarily not output due to, for example, a contact failure of the sensor is output again. In this case, it is not known when the rotation angle signal is no longer output. That is, once it is determined that the rotation angle signal system is abnormal, even if the rotation angle signal is output again thereafter, the reliability of the rotation angle signal decreases.

According to a fourth aspect of the present invention, when the abnormality determining means determines that the signal system including the rotation position detecting means is abnormal, the processing inhibiting means inhibits the processing based on the rotation angle signal thereafter. It is desirable to configure so that As a result, it is possible to avoid executing a process based on the rotation angle signal having low reliability.

By the way, even if the internal combustion engine is in an operation stop state, if the output shaft of the internal combustion engine is connected to a generator or the like, the internal combustion engine may be reversely rotated by a load from the connected generator or the like. . Also in this case, a rotation angle signal is generated as if the output shaft is rotating normally. Then, a predetermined process based on the rotation angle signal is executed, which causes inconvenience such that a normal diagnosis is not performed. Further, when the rotation speed of the output shaft calculated based on the rotation angle signal becomes equal to or higher than a predetermined rotation speed, a fuel injection process, an ignition process, and the like are generally performed. If a fuel injection process, an ignition process, or the like is performed in a state where the engine is rotated in the reverse direction, the internal combustion engine may be broken.

However, in this case, since the reference signal is output at an appropriate timing together with the rotation angle signal, the above-described configuration in which the abnormality of the rotation angle signal is determined based on the reference signal cannot be handled. Therefore, it is conceivable to adopt the configuration described in claim 5.

The information processing apparatus according to the fifth aspect is used for a hybrid vehicle using both an internal combustion engine and a motor, similarly to the information processing apparatuses according to the first to fourth aspects. The hybrid vehicle here refers to a vehicle in the same category as the hybrid vehicle described above in the description of claims 1 to 4.

In the information processing apparatus according to the present invention, the rotation angle signal output from the rotation position detection means for detecting that the rotation position of the output shaft of the internal combustion engine has reached a predetermined predetermined rotation position is set. It is assumed to be entered.
It is sufficient that at least a rotation angle signal is input.
The same reference signal as in claim 1 may be input. Here, the “predetermined process” and the “rotation angle signal” are the same as those described above as the description of the information processing apparatus according to claim 1 and thus are omitted.

In the information processing apparatus according to the present invention, the rotation direction determination means determines the rotation direction of the output shaft of the internal combustion engine, and even if the rotation angle signal is output, the rotation direction determination means determines the rotation direction of the internal combustion engine. When it is determined that the output shaft is rotating in the reverse direction, the abnormality determination unit determines that the output rotation angle signal is abnormal. If the abnormality determination unit determines that the rotation angle signal is abnormal, the processing prohibition unit prohibits a process based on the rotation angle signal. That is,
It is determined whether the output shaft of the internal combustion engine is rotating in the forward direction or in the reverse direction. If the output shaft is rotating in the reverse direction, processing based on the rotation angle signal is prohibited. The rotation direction determination means may be, for example, a sensor that directly detects the rotation direction of the output shaft. Further, a circuit or the like for indirectly determining based on a rotation angle signal or the like may be used. In the latter case, for example, assuming that a rotation angle signal is output from an electromagnetic sensor, the rotation direction may be determined based on the waveform of the rotation angle signal. It should be noted that the rotation angle signal or the like is used as long as the reference signal is input.
This is because the determination may be made based on the reference signal.

Thus, it is possible to determine that the rotation angle signal generated when the output shaft of the internal combustion engine is reversely rotated by the load is abnormal. The load may be, for example, a load from a generator or the like when the output shaft is connected to the generator or the like. However, it is not limited to this. As described above, since the abnormality of the rotation angle signal can be determined, it is possible to avoid the inconvenience caused by the execution of the processing based on the rotation angle signal in a state where the output shaft of the internal combustion engine is rotated in the reverse direction. it can. Further, even when the minute rotation of the output shaft of the internal combustion engine alternately occurs in the normal rotation and the reverse rotation, the rotation angle signal during at least the reverse rotation is determined to be abnormal, and the rotation angle signal is determined to be abnormal. Based processing is prohibited. However, when the normal rotation and the reverse rotation are alternately repeated, the rotation angle signal output during the normal rotation is not determined to be abnormal.

Therefore, a missing tooth portion for determining that the output shaft of the internal combustion engine has reached the reference rotation angle appears in the rotation angle signal with the rotation of the output shaft. Assuming that a plurality of rotation positions are set as described above, the rotation angle signal further includes a missing tooth determination unit that determines whether a missing tooth portion exists, and the abnormality determination unit includes: After once determining that the rotation angle signal is abnormal, even if the rotation direction determination means determines that the output shaft of the internal combustion engine is rotating forward, the missing tooth determination means does not provide the missing rotation angle signal. As long as it is not determined that the tooth portion exists, the rotation angle signal may be determined to be abnormal.

As described above for the rotation angle signal,
In general, a notch of a projection called a chipped tooth is formed around a disk that generates a rotation angle signal so that a reference rotation angle such as 360 degrees of the crankshaft can be detected. Therefore, when the forward rotation of the output shaft is determined, it is a temporary forward rotation when the forward rotation of the minute angle and the reverse rotation alternately occur as described above, or depending on the operation of the internal combustion engine. Whether the rotation is forward rotation or forced forward rotation by a starter or the like is determined by determining the missing tooth portion. As a result, it is possible to prohibit processing based on the rotation angle signal output when the minute rotation of the output shaft of the internal combustion engine alternately causes forward rotation and reverse rotation of the minute angle. Can be avoided.

The information processing device according to claim 5 or 6 is based on the premise that at least a rotation angle signal is input. However, the information processing device receives a reference signal together with the rotation angle signal. Assuming that the rotation angle signal determined by the missing tooth determining means to have a missing tooth portion is output, the output direction of the internal combustion engine is determined by the rotating direction determining means. If it is determined that the motor is rotating forward and the reference signal is not output,
The abnormality determining means may be configured to determine that the reference signal system including the reference position detecting means is abnormal.

That is, in the information processing apparatus according to the fifth or sixth aspect, the normal / abnormal of the rotation angle signal is determined using the rotation direction of the output shaft, the missing tooth, etc. without using the reference signal. Therefore, when it is determined that the rotation angle signal is normal, if the reference signal is not output, it can be estimated that the reference signal is not output due to, for example, disconnection of the sensor or the like, and the reference signal system including the reference position detection unit is abnormal. Can be determined.

As described in claim 8, when only the reference signal is output, the rotation angle signal system including the rotation position detecting means is determined to be abnormal.
When the rotation angle signal system is determined to be abnormal, the processing determination means may prohibit processing based on the rotation angle signal. The detailed description of the information processing device according to claims 8 and 9 is omitted because it is the same as the description of the information processing device according to claims 3 and 4 described above.

The information processing apparatus according to any one of claims 1 to 4 and 7 to 9 executes a predetermined process at least based on a rotation angle signal. Thus, it is conceivable to realize an engine control device capable of executing an ignition process and a fuel injection process of an internal combustion engine.

Since the abnormality determination means determines that the rotation angle signal is abnormal, the subsequent ignition processing and fuel injection processing are surely prohibited, but until the abnormality determination means makes a determination. In a short period of time,
It is possible that the ignition process or the fuel injection process for the internal combustion engine is executed based on the abnormal rotation angle signal. Then, for example, if such an ignition process and a fuel injection process are performed in a state where the output shaft of the internal combustion engine is rotating in the reverse direction, it is conceivable that the internal combustion engine may be broken.

Therefore, during execution of the ignition processing or the fuel injection processing, if the rotation angle signal and the reference signal do not have a predetermined relationship, the diagnosis relating to the ignition and the fuel injection is prohibited. It is conceivable to provide ignition injection inhibiting means for inhibiting ignition and fuel injection to the internal combustion engine. In this case, aside from the determination processing by the abnormality determination means described above, during the ignition processing and the fuel injection processing, it is further determined whether or not the rotation angle signal and the reference signal have a predetermined relationship, and ignition of the internal combustion engine is performed. In this case, the diagnosis that is a prerequisite for fuel injection is prohibited. As a result, it is possible to appropriately prohibit the ignition injection processing based on the abnormal rotation angle signal even during a short period until the abnormality determination unit makes a determination.

[0041]

Embodiments of the present invention will be described below with reference to the drawings. It is needless to say that the embodiments of the present invention are not limited to the following, and can take various forms as long as they belong to the technical scope of the present invention. First Embodiment FIG. 1 is a schematic diagram showing a hybrid vehicle according to a first embodiment.

As shown in FIG. 1, the hybrid vehicle according to the first embodiment has an engine 1 as an internal combustion engine and two motor / generators (hereinafter referred to as "M / G") operating as motors or generators. 3) and 5). Here, the output shaft 1a of the engine 1 and the output shafts extending from the rotors of the M / Gs 3, 5 are respectively connected to predetermined gears of a planetary gear unit (not shown). Also, M / G5
Is connected to wheels (drive wheels) 11R, 11L of the vehicle via a differential gear 9.

Further, in the hybrid vehicle of this embodiment, each of the M / Gs 3 and 5 is connected to two inverters 1.
A motor / generator control device (hereinafter, referred to as M / G.ECU) 17 for controlling the M / G
An engine control device (hereinafter referred to as an engine EC) that controls the engine 1 while exchanging control information with the ECU 17;
19). In the first embodiment, the engine ECU 19 corresponds to an “information processing device”.

Each of the inverters 13 and 15 has a M / G
Based on a command from the ECU 17, DC power of a battery (not shown) is converted into AC power to operate the M / G 3, 5 as a motor. Is operated as a generator, and the generated AC power is converted into DC power to charge the battery. However, when one of the two M / Gs 3 and 5 operates as a motor and the other operates as a generator, the M / G operating as a motor operates not only as a battery but also as a generator. It is also driven by the power from the other M / G.

On the other hand, in the intake path 21 of the engine 1, the intake air amount of the engine 1 (the output of the engine 1).
Is provided with a throttle valve 23 for adjusting
The opening of the throttle valve 23 is adjusted by a DC motor 25 as an actuator.

The engine 1 has a NE sensor 31 as "rotational position detecting means" for detecting the rotation angle of its output shaft 1a, that is, the rotation angle of the crankshaft of the engine 1, and the rotation position of the output shaft 1a. A G sensor 33 is provided as a “reference position detecting means” for detecting that has become the reference position. Signals from the NE sensor 31 and the G sensor 33 are input to the engine ECU 19.

Although not shown, M / G · E
The CU 17 includes an accelerator opening sensor that detects the opening of the accelerator pedal (accelerator opening) operated by the vehicle driver, a brake sensor that detects that the brake pedal of the vehicle has been operated, and the traveling speed of the vehicle. Signals from various sensors for detecting the driving state of the vehicle, such as a vehicle speed sensor for detecting (vehicle speed), are also input.

In the hybrid vehicle of the first embodiment, the wheels 1 are connected via the differential gear 9 from the output shaft 7 of the M / G 5 using a battery as a power source.
The driving force is transmitted to the 1R and 11L.
As described above, the output shaft from the rotor 5 is connected to the output shaft from the rotor of the M / G 3 and the output shaft 1a of the engine 1 via the planetary gear unit.
The driving force to R, 11L or the deceleration force from wheels 11R, 11L is shared between each M / G 3, 5 and the engine 1.

Therefore, the M / G ECU 17 determines each of the M / G 3, 5 based on the state of charge of the battery, the gear ratio of the planetary gear unit, the running load of the vehicle detected from the accelerator opening sensor and the vehicle speed sensor, and the like. And the generated torque (output torque when operating as a motor and regenerative torque when operating as a generator) are determined.
5 is controlled by the inverters 13 and 15, and the target output of the engine 1 (that is, the target torque and the target rotation speed) is determined so that the fuel consumption and the emission of the engine 1 become the best. Here, the target torque may be “0” and the target rotation speed may be “0”. That is, the case where the engine 1 is stopped. And M / G ・ EC
U17 controls the outputs of the M / Gs 3 and 5 so that the determined target torque is applied as a load to the output shaft 1a of the engine 1.

The engine ECU 19 performs fuel injection control and ignition control for the engine 1 based on the signals from the NE sensor 31 and the G sensor 33, and detects the engine 1 based on the signal from the rotation angle sensor 31. The DC motor 25 is driven to control the opening of the throttle valve 23 so that the rotation speed converges to the target rotation speed commanded by the M / G ECU 17, whereby the output of the engine 1 becomes M / G. The output is controlled to the target output determined by the G · ECU 17. Further, the engine ECU 19 determines that N
Various diagnostics are executed based on the rotation angle signal from the E sensor 31. Examples of the various diagnostics include a disconnection diagnostic of an air flow meter, a diagnostic for determining whether an oxygen sensor has been activated or deteriorated, an abnormality determination diagnostic based on a knock sensor, a disconnection diagnostic of a water temperature sensor, and a diagnostic for misfire detection.

By the operations of the M / G ECU 17 and the engine ECU 19, the M / Gs 3, 5 and the engine 1 are controlled in various power balance patterns. For example, if the battery is charged to a predetermined amount or more and the traveling load is small, the M / G5 is operated as a motor to drive the vehicle by the output of the M / G5,
The output of the engine 1 is set to “0”, and the operation of the engine 1 is stopped. In this state, when the traveling load increases, the output shaft 1a of the engine 1 is forcibly rotated by a starter (not shown) to start the engine 1, and the M / G
The insufficient driving force at the output of the engine 5 is compensated by the output of the engine 1. Further, when the battery is discharged by a predetermined amount or more and the charging power is reduced, the output of the engine 1 is set to M / G5
, And the battery is charged by the M / G 3 using the remaining output of the engine 1.
Such control may be performed.

As described above, the engine ECU 19 that controls the engine 1 of the hybrid vehicle executes a predetermined process based on at least the rotation angle signal from the NE sensor 31.
U19 determines whether or not the rotation angle signal from the NE sensor 31 is an abnormal signal. If it is determined that the rotation angle signal is an abnormal signal, the processing based on the rotation angle signal is prohibited.

Here, in order to facilitate understanding of the following description, first, the rotation angle signal detected by the NE sensor 31 and the reference signal detected by the G sensor 33 will be described. In the first embodiment, the signal rotor 41 as shown in FIG.
a. Signal rotor 41
Is mounted coaxially with the output shaft 1a, and a plurality of projections 41a are formed on the outer periphery of the signal rotor 41. The protrusion 41a of the signal rotor 41 is 360 degrees / 3
6 = 10 degrees, and has two missing portions (hereinafter referred to as "missing teeth") 41b. The NE sensor 31 is disposed outside the signal rotor 41, and detects passage of the protrusion 41a accompanying rotation of the signal rotor 41.

FIG. 4 shows a signal waveform output from the NE sensor 31. FIG. 4A shows the output shaft 1.
The signal waveform when a rotates in the forward direction (the direction rotated by the operation of the engine 1) is shown. FIG. 4B shows a signal waveform when the output shaft 1a rotates in the opposite direction.

Here, the waveform corresponding to one projection 41a is a waveform having a shape in which the positive and negative are reversed at the time point closest to the NE sensor 31 (hereinafter referred to as a "projection corresponding waveform"). Therefore, when the output shaft 1a rotates in a certain direction, that is, when the signal rotor 41 rotates in a certain direction, the signal output from the NE sensor 31 is:
A repetition pattern of the projection-corresponding waveform is obtained. It should be noted that there is a portion (hereinafter referred to as a "missing tooth portion") in which the interval between the projection-corresponding waveforms is widened corresponding to the missing tooth 41b (FIG. 4).
reference).

FIG. 3B is for explaining the correspondence between the position of the protrusion 41a and the signal waveform output from the NE sensor 31, and the position of the protrusion 41a is represented by the symbols α, β,
It is indicated by three symbols of γ. That is, when rotating in the above-described forward direction (the direction indicated by the symbol A), the protrusion 4
1a traverses in front of the NE sensor 31 in the order of positions α → β → γ, while, when rotating in the opposite direction (the direction indicated by the symbol B), the protrusion 41a becomes N in the order of positions γ → β → α.
It crosses in front of the E sensor 31. The position α and the position γ are symmetric about the position β. The correspondence between the positions α, β, γ and the signal waveforms is as shown in FIG. That is, FIG. 4A shows a case where the protrusion 41a passes in the order of positions α → β → γ, and shows a case where the signal rotor 41 rotates forward. In this case, the signal which is “0” at the position α first increases slowly to the plus side, rapidly reverses to the negative side around the position β, and then slowly increases to become “0” at the position γ. I do. FIG. 4B shows the protrusion 41a.
Are passed in the order of γ → β → α, in which the signal rotor 41 rotates in the reverse direction. in this case,
The signal that is “0” at the position γ slowly decreases to the negative side first, rapidly reverses to the plus side around the position β, and gradually decreases to become “0” again at the position α.

The reference signal detected by the G sensor 33 has a similar waveform. However, the output shaft 1a of the engine 1
Are provided at three reference positions on the outer periphery of a signal rotor (not shown) attached to the motor. Therefore, during the period when the output shaft 1a rotates 360 degrees, three projection-corresponding waveforms corresponding to one projection shown in FIG. 4 are output.

Next, based on the flowchart of FIG.
The signal abnormality determination process executed by the engine ECU 19 will be described. This signal abnormality determination process is performed by the engine ECU 19
Is repeatedly executed at predetermined time intervals. First, in the first step S100, based on the rotation angle signal from the NE sensor 31, the rotation speed E (n
e) is calculated. The rotation speed E (ne) is 3 for the crankshaft.
It is calculated from the measurement result of the pulse time interval of the rotation angle signal during the period of rotating by 60 degrees.

In the following S110, the rotational speed E (g) of the engine 1 is calculated based on the reference signal from the G sensor 33. Similarly to S100, the rotation speed E (g) is calculated from the measurement result of the pulse time interval of the reference signal during the period when the crankshaft rotates 360 degrees. In subsequent S120, S110
E ′ (g) is obtained by correcting the rotational speed E (g) calculated in the above. As described above, the G sensor 33 has a crankshaft of 36.
Only three protrusions are detected while rotating by 0 degrees. Therefore, the rotation speed E (g) calculated based on the reference signal
Has a larger error compared to the rotation speed E (ne) calculated based on the rotation angle signal. Therefore, here, VVT
(Variable Valve Timing) E (g) is corrected using the advance / retard control amount of the reference signal used for control, and E ′ is corrected.
(G) is calculated. Then, the process proceeds to S130.

In S130, the rotation speed E '(g) is "0".
Is determined. Here, if E ′ (g) ≠ 0 (S130: YES), that is, if the reference signal has been output, the process proceeds to S140. On the other hand, E '
If (g) = 0 (S130: NO), that is, if the reference signal has not been output, the process proceeds to S190.

At S140, the process proceeds when the reference signal is output, and it is determined whether or not the rotation speed E (ne) is "0". Here, when E (ne) ≠ 0 (S14)
0: YES), that is, if the rotation angle signal has been output, the process proceeds to S150. On the other hand, when E (ne) = 0 (S140: NO), that is, when the rotation angle signal is not output, the rotation angle signal system abnormality flag X (ne) is set to "1 (abnormal)" in S180. , And then the signal abnormality determination processing ends. In this case, the rotation angle signal is not output in spite of the reference signal, and it is considered that the NE sensor 31 or the like has a failure or is disconnected.

In S150, it is determined whether or not the difference between the rotation speed E (ne) and the rotation speed E '(g) is smaller than a predetermined value δ. Here, when | E (ne) −E ′ (g) | <δ (S150: YES), that is, when both signals are output at appropriate timing, the process proceeds to S160. On the other hand, if | E (ne) −E ′ (g) | ≧ δ (S150: NO), the process proceeds to S170. | E (n
e) -E '(g) | ≧ δ is a case where both the rotation angle signal and the reference signal are output, but both signals are not output at appropriate timing.

In S160, the rotation angle signal abnormality flag XK
“0 (normal)” is substituted for (ne), and “0 (normal)” is substituted for the reference signal system abnormality flag X (g), and then the signal abnormality determination processing is terminated. In S170, “1 (abnormal)” is substituted for the rotation angle signal abnormality flag XK (ne),
That is, the rotation angle signal is determined to be abnormal, and thereafter, the signal abnormality determination processing ends.

When a negative determination is made in S130, that is, when it is determined that the reference signal is not output, in S190, the rotation angle signal abnormality flag XK (n
Substitute "1" for e), and then end the signal abnormality determination processing. In this case, the rotation angle signal may not be output, but if there is no reference signal, the rotation angle signal is uniformly determined to be abnormal.

Next, based on the flowchart of FIG.
Following the above-described signal abnormality determination processing, the engine ECU 19
Will be described. This prohibition process,
This is based on the processing result of the signal abnormality determination processing described above. First, in the first step S300, the rotation angle signal system abnormality flag X (ne) or the rotation angle signal abnormality flag XK
It is determined whether at least one of (ne) is “1”. Here, when at least one is "1" (S3
00: YES), the process based on the rotation angle signal is prohibited in S310, and then the prohibition process ends. On the other hand, if both are “0” (S300: NO), the process based on the rotation angle signal is permitted in S320, and then the prohibition process ends. Here, the processing based on the rotation angle signal may be, for example, a diagnosis processing performed on condition that the rotation angle signal is generated, for example, a disconnection diagnosis of the G sensor 33 or the like. Further, a diagnosis that is executed based on the rotation speed of the output shaft 1a of the engine 1 (hereinafter, referred to as “engine rotation speed”) calculated based on the rotation angle signal may be considered. Further, an interruption process using a predetermined signal generated based on the rotation angle signal is conceivable.

Next, the engine ECU 1 of the first embodiment will be described.
The effect of 9 will be described. When the reference signal is not output (S130: NO in FIG. 2), the engine ECU 19 of the first embodiment determines that the rotation angle signal is abnormal, and sets the rotation angle signal abnormality flag XK (ne) to “1”. (S190 in FIG. 2). As described above, the first embodiment focuses on the reference signal output from the G sensor 33 in synchronization with the rotation of the output shaft 1a of the engine 1 in the same manner as the rotation angle signal. That is, in the case where the output shaft 1a of the engine 1 is alternately rotated in the forward direction and the reverse direction at a small angle to output the rotation angle signal, the rotation angle is set to be wider than the rotation position at which the rotation angle signal is output. There is a high possibility that the reference signal output corresponding to the reference position is not output. For example, in the present embodiment, while the crankshaft rotates 360 degrees, 34 pulses of the rotation angle signal are output, whereas three pulses of the reference signal are output. Therefore, when only the rotation angle signal is output and the reference signal is not output, it is an abnormal rotation angle signal generated by alternately rotating the output shaft of the internal combustion engine in the forward and reverse directions at a small angle. Assuming
Processing based on this rotation angle signal is prohibited. As a result, processing such as a diagnosis based on an abnormal rotation angle signal generated when the output shaft 1a of the engine 1 alternately rotates in the forward and reverse directions at a small angle is prohibited, and an erroneous diagnosis is made. Inconvenience can be avoided.

Even when the rotation angle signal is output together with the reference signal (S130 in FIG. 2: YES,
S140: YES), it is determined whether or not the difference between the engine speed E (ne) calculated based on the rotation angle signal and the engine speed E '(g) calculated based on the reference signal is within a predetermined range. If it is determined (S150 in FIG. 2) that the rotation angle signal is not within the predetermined range, it is determined that the rotation angle signal is abnormal (FIG. 2).
The processing based on the rotation angle signal is prohibited (S170 in FIG. 5).

In this way, the output shaft 1 of the engine 1
When the reference signal happens to be output together with the rotation angle signal generated by alternately rotating a in the forward and reverse directions at a small angle, or the rotation angle signal is generated due to poor contact of the rotation angle signal system or the like. When the output timing is abnormal, it is possible to determine the abnormality of the output rotation angle signal. As a result, it is possible to prohibit processing such as a diagnosis based on such a rotation angle signal, and it is possible to reliably avoid inconvenience associated with the execution of the processing.

Further, when only the reference signal is output and the rotation angle signal is not output (S13 in FIG. 2)
0: YES, S140: NO), it is determined that the rotation angle signal system including the NE sensor 31 is abnormal, and the rotation angle signal system abnormality flag X (ne) is set to “1”. In this case, since the rotation angle signal is not output, the process based on the rotation angle signal is not executed. However, it is possible that the rotation angle signal is output again later due to, for example, a cause of poor contact. . In this case, it is not known when the rotation angle signal is no longer output, and the reliability of the rotation angle signal is low. Therefore, also in this case, the process based on the rotation angle signal is prohibited (S310 in FIG. 5). This is advantageous in that execution of processing based on the rotation angle signal with low reliability can be eliminated. [Second Embodiment] Next, a second embodiment will be described. The second embodiment differs from the first embodiment in the signal abnormality determination process executed by the engine ECU 19.

In the first embodiment, as described with reference to the flowchart of FIG. 2, it is determined whether or not the engine speed E '(g) calculated based on the reference signal is "0". That is, the abnormality of the rotation angle signal is determined by determining the presence or absence of the reference signal. On the other hand, the signal abnormality determination process of the second embodiment determines the abnormality of the rotation angle signal by determining the rotation direction of the output shaft 1a of the engine 1. Since the configuration other than the configuration related to the signal abnormality determination is the same as that of the first embodiment, only different portions will be described below.

First, the signal abnormality determination processing will be described with reference to FIGS. First, in the first step S600, it is determined whether or not there is a rotation angle signal. This determination is made based on an input signal from the NE sensor 31. Here, when it is determined that there is a rotation angle signal (S60)
0: YES), and proceeds to S610. On the other hand, when it is determined that there is no rotation angle signal (S600: NO), S76.
Move to 0.

In S610, when it is determined that there is a rotation angle signal, it is determined whether or not a missing tooth portion exists in the rotation angle signal. If it is determined that the missing tooth portion exists (S610: YES), the process proceeds to S620. On the other hand, when it is determined that the missing tooth portion does not exist (S61)
0: NO), and proceeds to S690 of FIG.

In S620, it is determined whether or not the output shaft 1a of the engine 1 is rotating forward. This determination is made based on a REVD signal output from a first determination circuit described later. The output shaft 1 of the engine 1 is determined by the first determination circuit.
a is determined to be rotating forward, the REVD signal becomes hi.
gh level, and if it is determined that
The VD signal goes low. If it is determined that the motor is rotating forward (S620: YES), "0" is assigned to the rotation angle signal abnormality flag XK (ne) and "0" is assigned to the reverse rotation flag rev in S630. And then
The process moves to S650. On the other hand, if it is determined that the motor is rotating in the reverse direction (S620: NO), "1" is assigned to the rotation angle signal abnormality flag XK (ne) and "1" is assigned to the reverse rotation flag rev in S640. Then, the process proceeds to S650.

In S690 of FIG. 7, the process proceeds when it is determined in S610 that there is no missing tooth portion, it is determined whether or not "1" is set in the reverse rotation flag rev. This determination is for determining whether or not the output shaft 1a of the engine 1 is rotating in the reverse direction. Where rev =
1 (S690: YES), that is, the output shaft 1
If a rotates in the reverse direction, the process proceeds to S700. On the other hand, if rev = 0 (S690: NO), that is, if the output shaft 1a is rotating forward, the process proceeds to S730.

In S700 and S730, it is determined whether or not the rotation direction of the output shaft 1a of the engine 1 has been reversed. This determination is made based on a REVD signal which is an output signal from a second determination circuit described later. Engine 1
To S700 when the output shaft 1a is rotated in the reverse direction.
In step S710, when it is determined that the rotation direction has been reversed (S700: YES), that is, when the rotation is forward, “0” is substituted for the reverse rotation flag rev in S710, and thereafter, in S650 in FIG. Move to. On the other hand, when it is determined that there is no reversal of the rotation direction (S700: NO),
That is, when the reverse rotation is continued, “1” is substituted into the rotation angle signal abnormality flag XK (ne) in S720, and “1” is substituted into the reverse rotation flag rev, and S650 in FIG.
Move to.

If it is determined in S730 that the output shaft 1a is rotating forward when the rotation direction is reversed (S730: YES), that is, if the output shaft 1a is rotated in the reverse direction, the rotation is performed in S750. Angle signal abnormality flag XK
(1) is substituted for (ne), and "1" is substituted for the reverse rotation flag rev. Thereafter, the flow shifts to S650 in FIG. On the other hand, when it is determined that there is no reversal of the rotation direction (S
730: NO), that is, when the forward rotation is continued, “0” is substituted for the reverse rotation flag rev in S740, and then the process proceeds to S650 in FIG.

As described above, S650 in FIG.
630, 640, S710, 720, 740 in FIG.
The process proceeds from any one of the processes at 750. In S650, it is determined whether or not the rotation angle signal abnormality flag XK (ne) is “0”. That is, it is determined whether or not the rotation angle signal is determined to be normal. Here, when XK (ne) = 0 (S650: YES), the process proceeds to S660. On the other hand, if XK (ne) = 1 (S650: NO),
This signal abnormality determination processing ends.

In S660, the process proceeds when it is determined that the rotation angle signal is normal, it is determined whether or not there is a reference signal from the G sensor 33. Here, if it is determined that there is a reference signal (S660: YES), “0” is substituted into the reference signal system abnormality flag X (g) in S670, and then the present signal abnormality determination processing ends. On the other hand, if it is determined that there is no reference signal (S660: NO), the reference signal including the G sensor 33 is not output even though the output rotation angle signal is normal even though the output is normal. Is determined to be a system abnormality, and the reference signal system abnormality flag X is determined in S680.
“1” is substituted for (g), and then the signal abnormality determination processing ends.

When the determination in S600 is negative, that is, when it is determined that there is no rotation angle signal, in S760, the rotation angle signal abnormality flag XK (n
Substitute "1" for e). At S770, it is determined whether the rotation angle signal system abnormality flag X (ne) is “1” or a reference signal is present. Here, X (ne) = 1 or when there is a reference signal (S770: YES), that is, after the rotation angle signal system is once determined to be abnormal, or when there is a reference signal despite the absence of the rotation angle signal In step S78, it is determined that the rotation angle signal system including the NE sensor 31 is abnormal.
At 0, "1" is substituted for the rotation angle signal system abnormality flag X (ne), and thereafter, the signal abnormality determination processing ends. on the other hand,
If X (ne) = 0 and there is no reference signal (S77
0: NO), and in S790, the rotation angle signal system abnormality flag X
“0” is substituted for (ne), and the signal abnormality determination processing ends. If neither the rotation angle signal nor the reference signal is output, the engine 1 may normally stop, but the NE sensor 31 and the G sensor 33
May have failed together. Therefore, when it is determined in S600 that there is no rotation angle signal, the rotation angle signal abnormality flag XK (ne) is uniformly set to “1”.
And keep it.

Next, a description will be given of a first determination circuit that enables the determination in S620 described above. FIG. 8 is a circuit diagram showing a first determination circuit according to the second embodiment.
5 is a time chart showing a signal waveform of a predetermined portion of the circuit.

As shown in FIG. 8, the determination circuit
(Low-pass filter) 51, two comparators 52 and 53 for determining the signal level of the rotation angle signal input via the LPF 51, and a chip for determining the missing tooth portion in the rotation angle signal input via the LPF 51 Tooth determination circuit 54
And latches 55 and 56 operated by the outputs of the comparators 52 and 53 and the missing tooth determination circuit 54, and set / reset latches (hereinafter referred to as "SR latches") 57 operated by the outputs of the latches 55 and 56. And In order to distinguish the two comparators 52 and 53, the A comparator 52 and the B comparator 53
It is described. The latch 55 connected to the A comparator 52 is described as an A latch 55, and the B comparator 53
Are described as B latches 56 for distinction.

The NE sensor 31 is connected to the input terminal of the LPF 51.
The output terminal of the LPF 51 is connected to the non-inverting input terminal (+) of the A comparator 52, the inverting input terminal (-) of the B comparator 53, and the missing tooth determination circuit 54. The potential of the inverting input terminal (−) of the A comparator 52 is a comparison voltage V slightly higher than “0”.
th1. On the other hand, the potential of the non-inverting input terminal (+) of the B comparator 53 is set to the comparison voltage Vth2 slightly lower than “0”. The output terminal of the A comparator 52 is connected to a power supply via a pull-up resistor 58 and to the input terminal (D) of the A latch 55. The output terminal of the B comparator 53 is connected to a power supply via a pull-up resistor 58 and to the input terminal (D) of the B latch 56.
The output terminal of the missing tooth determination circuit 54 is connected to the inverter 59, and the output terminal of the inverter 59 is connected to the reset terminals (R) of the A and B latches 55 and 56. The output terminal (Q) of the A latch 55 is connected to the set terminal (S) of the SR latch 57. Also,
The output terminal (Q) of the B latch 56 is connected to the reset terminal (R) of the SR latch 57. Then, the output terminal (Q) of the SR latch 57 becomes a REVD signal indicating the rotation direction.

In the A comparator 52, when the signal level of the rotation angle signal input to the non-inverting input terminal (+) exceeds the comparison voltage Vth1 of the inverting input terminal (-), the signal level of the output terminal becomes high (hereinafter referred to as high). "H"). On the other hand, in the B comparator 53, when the signal level of the rotation angle signal input to the inverting input terminal (-) falls below the comparison voltage Vth2 of the non-inverting input terminal (+), the signal level of the output terminal becomes H.

When the signal level of the reset terminal (R) is low (hereinafter referred to as “L”), the signal levels of the input terminal (D) are output from the latches 55 and 56 of A and B. Changes from L to H, the signal level at the output terminal (Q) is held at H, and when the signal level at the reset terminal (R) goes to H, the signal level at the output terminal (Q) is held at L. Operate.

When the signal level of the set terminal (S) becomes H, the SR latch 57 holds the signal level of the output terminal (Q) at H, and when the signal level of the reset terminal (R) becomes H, the output terminal It operates so as to maintain the signal level of (Q) at L. The missing tooth portion determination circuit 54 detects a time interval between two projection-corresponding waveforms that are successively output from the rotation angle signal, and when the time interval becomes 2.5 times or more the previously detected time interval, a predetermined period. Only hold the signal level at H,
Otherwise, the signal level is kept at L.

Next, based on the time chart of FIG.
The operation of the first determination circuit shown in FIG. 8 will be described. FIG.
(A) and (b) show the rotation angle signal output from the LPF 51 and the signal level (n
e +), the signal level of the output terminal of the B comparator 53 (ne−), the signal level of the output terminal of the missing tooth determination circuit 54, the signal level of the output terminal (Q) of the SR latch 57,
That is, the levels of the REVD signals are described in association with each other. FIG. 9A shows the output shaft 1 of the engine 1.
FIG. 9B shows a case where a is rotating forward.
This is the case where the output shaft 1a of the engine 1 is rotating in the reverse direction.

As shown in FIG. 9, when the level of the rotation angle signal from the LPF 51 exceeds the comparison voltage Vth1 of the inverting input terminal (-) of the A comparator 52, the signal level (ne +) of the output terminal of the A comparator 52 Changes from L to H, and falls below the comparison voltage Vth1, the signal level (ne +) of the output terminal changes from H to L. That is, when the waveform of the rotation angle signal appears on the plus side, the output terminal of the A comparator 52 goes high. Conversely, LPF51
Is lower than the comparison voltage Vth2 of the non-inverting input terminal (+) of the B comparator 53,
The signal level (ne-) of the output terminal of the comparator 53 changes from L to H, and when the voltage exceeds the comparison voltage Vth2, the signal level (ne-) of the output terminal changes from H to L. That is, when the waveform of the rotation angle signal appears in the negative direction, the output terminal of the B comparator 53 goes high.

When the missing tooth determination circuit 54 determines a missing tooth in the rotation angle signal, it sets the signal level of the output terminal to the H level for a predetermined period (see FIG. 9). The output terminal of the missing tooth portion determination circuit 54 is input to the reset terminals (R) of the A and B latches 55 and 56 via the inverter 59. Therefore, immediately after it is determined that there is a missing tooth portion, during a predetermined period in which the output signal from the missing tooth portion determination circuit 54 is at the H level, the reset terminals (R) of the A and B latches 55 and 56 are set.
Is at L level, and the reset terminal (R) is at H level in other periods. Therefore, the A and B latches 5
5, 56, during a predetermined period immediately after the missing tooth portion is determined,
When the signal levels of the output terminals of the corresponding A and B comparators 52 and 53 change from L to H, the signal level of the output terminal (Q) changes to H during the period until the reset terminal (R) changes to H.
To hold. Therefore, when the signal level of the output terminal of the A comparator 52 becomes H during a predetermined period immediately after the missing tooth is determined, the set terminal (S) of the SR latch becomes H level, and the output terminal (Q), that is, the REVD signal becomes It becomes H level. When the signal level of the output terminal of the B comparator 53 becomes H during a predetermined period immediately after the missing tooth is determined, the reset terminal (R) of the SR latch becomes H level, and the output terminal (Q), that is, the REVD signal becomes It becomes L level.

That is, the first determination circuit shown in FIG. 8 determines whether the waveform immediately after the missing tooth portion of the rotation angle signal appears in the plus direction or the minus direction. If it appears in the plus direction, that is, if the output shaft 1a of the engine 1 is rotating forward, the REVD signal goes high, and if it appears in the minus direction, that is, the output shaft 1a of the engine 1.
Is reverse rotation, the REVD signal becomes L level.

Therefore, in S620 during the above-described signal abnormality determination processing, it can be determined whether or not the output shaft 1a of the engine 1 is rotating forward by determining whether or not the REVD signal is at the H level. Next, a description will be given of a second determination circuit that enables the determination in S700 and S730 (see FIG. 7) during the above-described signal abnormality determination process.

Unlike the first determination circuit, the second determination circuit determines the direction of rotation regardless of the presence or absence of a missing tooth portion. This determination method determines the rotation direction of the output shaft 1a of the engine 1 based on the shape of the waveform of the rotation angle signal. In order to facilitate understanding of the circuit described below, a conceptual description of this determination method will be given first with reference to FIG.

This method focuses on one of the waveforms appearing on the plus side or the minus side of the rotation angle signal. Focusing on one of the waveforms appearing on the plus side in FIG. 4A, it can be seen that the signal level increases slowly and decreases instantaneously. That is, as shown in FIG. 4A, when the output shaft 1a of the engine 1 is rotating forward,
For one of the waveforms appearing on the plus side, if the increasing period of the signal level is T1 and the decreasing period is T2, T1> T2
It has become. Similarly, referring to FIG. 4B, that is, when the output shaft 1a of the engine 1 is rotating in the reverse direction, T
1 <T2. Then, even when focusing on one of the waveforms appearing on the minus side, similarly, in the forward rotation and the reverse rotation, the increasing period and the decreasing period of the signal level are reversed.

Therefore, focusing on one waveform appearing on the plus side or the minus side, the signal level increasing period,
If the magnitude of the decrease period is determined, the output shaft 1a of the engine 1 is determined.
Can be determined. A second determination circuit for making such a determination will be described below.

FIGS. 10 and 11 are circuit diagrams showing the second determination circuit, and FIG. 12 is a time chart showing signal waveforms of predetermined portions of this circuit. As shown in FIGS. 10 and 11, the second determination circuit includes an LPF (low-pass filter) 61 and two comparators 62 and 63 that determine the signal level of the rotation angle signal input via the LPF 61.
A differential circuit 64 that outputs a differential waveform signal of the waveform of the rotation angle signal input through the LPF 51; and two comparators 65 and 66 that determine the signal level of the differential waveform signal from the differential circuit 64. ing. Hereinafter, the four comparators 62, 63, 65, and 66 are described as an A comparator 62, a B comparator 63, a C comparator 65, and a D comparator 66, respectively.

The second determination circuit includes an oscillator 75 for outputting a pulse signal of a predetermined clock frequency, four counters 81, 82, 83, 84, and counters 81, 82, 8
Comparison circuits 85 and 86 for comparing the output results from 3, 84
And an SR latch 87. Hereinafter, the counter 8
1 to 84 are described as an A counter 81, a B counter 82, a C counter 83, and a D counter 84, and the two comparison circuits 85 and 86 are described as an A comparison circuit 85 and a B comparison circuit 86, respectively, to distinguish them. .

Each of the comparators 62, 6 of A to D described above
The output terminals of 3, 65 and 66 are connected to a power supply via separate pull-up resistors 69, respectively. The A and B comparators 62 and 63 are the same as the A and B comparators 52 and 53 of the first determination circuit described above with reference to FIG. Becomes H level when appears on the plus side. The B comparator 63 goes to the H level when the waveform of the rotation angle signal output from the LPF 61 appears on the negative side.

The differentiating circuit 64 outputs a differentiated waveform signal obtained by differentiating the signal waveform of the rotation angle signal. This differentiation circuit 64
Is a well-known circuit composed of an OP amplifier, a feedback resistor, a capacitor, and the like. The non-inverting input terminal (+) of the C comparator 65 and the inverting input terminal (-) of the D comparator 66 are connected to the output terminal of the differentiating circuit 64. The potential of the inverting input terminal (-) of the C comparator 65 is set to a comparison voltage Vth3 slightly larger than "0". The potential of the non-inverting input terminal (+) of the D comparator 66 is set to the comparison voltage Vth4 slightly smaller than “0”.

Therefore, the signal level of the output terminal of the C comparator 65 changes from L to H when the signal level output from the differentiating circuit 64 exceeds the comparison voltage Vth3, and changes from H to L when the signal level falls below the comparison voltage Vth3. The signal level of the output terminal of the D comparator 66 is
4 goes from L to H when the signal level falls below the comparison voltage Vth4, and goes from H to L when the signal level exceeds the comparison voltage Vth4. That is, when the differentiated waveform signal output from the differentiating circuit 64 appears on the plus side, the signal level of the output terminal of the C comparator 65 becomes H level,
When the differentiated waveform signal output from appears on the minus side,
The signal level of the output terminal of the D comparator 66 becomes H level.

Further, as shown in FIG. 11, the output terminals of the comparators 62, 63, 65, 66 of A to D are connected to four AND circuits 76, 77, 78, 79 of two inputs in a predetermined combination. ing. These four AND circuits 7
6 to 79, A and circuit 76, B and circuit 77, C
An AND circuit 78 and a D AND circuit 79 will be distinguished below.

Signal (ne +) from A comparator 62
And the signal (ne '+) from the C comparator 65 is input to the A AND circuit 76, and the signal (ne +) from the A comparator 62 and the signal (n
e′-) is input to the B-and circuit 77. Also,
The signal (ne−) from the B comparator 63 and the signal (ne′−) from the D comparator 66 are converted into a C-AND circuit 77.
The signal (ne−) from the B comparator 63 and the signal (ne ′ +) from the C comparator 65 are input to the D-AND circuit 79.

The output terminals of the AND circuits 76 to 79 of A to D are connected to the permission terminals of the counters 81 to 84 of A to D, respectively. The output terminal of the oscillator 75 is connected to the clock terminals (CLK) of the counters 81 to 84 of A to D. A and B counters 81 and 82
Is connected to the completion terminal of the A comparison circuit 85, and the reset terminals (RST) of the C and D counters 83 and 84 are connected to the completion terminal of the B comparison circuit 86. The output terminal of the A counter 81 is connected to the first input terminal (input a) of the A comparison circuit 85, and the output terminal of the B counter 82 is connected to the second input terminal (input b) of the A comparison circuit 85. It is connected to the.

The output terminal of the A comparator 62 is connected to the comparison timing terminal (comparison) of the A comparison circuit 85, and the output terminal of the B comparator 63 is connected to the comparison timing terminal (comparison) of the B comparison circuit 86. Terminal is connected. Two output terminals (true and false) of the comparison circuits 85 and 86 for A and B are input to two OR circuits 88 and 89, respectively. These two OR circuits 88 and 89 are described as an A OR circuit 88 and a B OR circuit 89. A or circuit 8
The output terminal (true) of the A comparison circuit 85 and the output terminal (true) of the B comparison circuit 86 are connected to the input terminal 8. The output terminal (false) of the A comparison circuit 85 and the output terminal (false) of the B comparison circuit 86 are connected to the input terminal of the B OR circuit 89.

The set terminal (S) of the SR latch 87 has
The output terminal of the A OR circuit 88 is connected. The output terminal of the B OR circuit 89 is connected to the reset terminal (R). Then, the output terminal (Q) of the SR latch 87 becomes the output from the second determination circuit, and the signal from the output terminal (Q) becomes the REVD signal.

Here, the counters 81 to 8 of A to D described above are used.
4 and the operation of the A and B comparison circuits 85 and 86 will be described. Each of the counters 81 to 84 performs counting based on a pulse signal from the oscillator 75 input to the clock terminal (CLK) during a period when the signal level of the permission terminal is at the H level. The count value is output from the output terminal to the A or B comparison circuits 85 and 86. And
When the signal level of the reset terminal (RST) becomes H level, the counter value is reset.

When the signal level from the A comparator 62 input to the comparison timing terminal (comparison) changes from H to L, the A comparison circuit 85 inputs the A input to the first input terminal (input a). Count value a from counter 81
And the count value b from the B counter 82 input to the second input terminal (input b). Here, the count value a input to the first input terminal (input a) is:
When the count value is larger than the count value b input to the second input terminal (input B), the signal level of the output terminal (true) changes from L level to H level, and the signal level of the completion terminal changes to L level. To H level. On the other hand, the count value a input to the first input terminal (input a) is changed to the count value b input to the second input terminal (input B).
In the following cases, the signal level of the output terminal (false) changes from L level to H level, and the signal level of the completion terminal changes from L level to H level.

Similarly to the A comparison circuit 85, when the signal level of the B comparator 63, which is input to the comparison timing terminal (comparison) from the B comparator 63 changes from H to L, the first input terminal (B). A count value c from the C counter 83 input to the input c) and a second input terminal (input d)
Is compared with the count value d from the D counter 84 which is input to the. If c <d, the signal level of the output terminal (true) changes from L level to H level, and the signal level of the completion terminal changes from L level to H level. on the other hand,
If c ≧ d, the signal level of the output terminal (false) changes from L level to H level, and the signal level of the completion terminal changes from L level to H level.

The operation of the SR latch 87 is described below.
This is the same as the SR latch 57 in the first determination circuit described above with reference to FIG. FIG. 12 shows the rotation angle signal output from the LPF 61, the signal (ne +) output from the A comparator 62, the signal (ne−) output from the B comparator 63, and the differentiation of the rotation angle signal output from the differentiation circuit 64. Waveform signal (ne '), A to D counters 81 to 84
And the REVD signal of the output terminal (Q) of the SR latch 87 are shown in correspondence with each other.

Here, the output signal (ne +) from the A comparator 62 based on the rotation angle signal and the B comparator 6
The output signal (ne-) from 3 is the same as that of the above-described determination circuit. That is, when the waveform of the rotation angle signal appears on the plus side, the ne + signal goes high, and when the waveform of the rotation angle signal appears on the minus side, the ne− signal goes high. As described above, the comparison voltage of the A comparator 62 and the comparison voltage of the B comparator 63 are set to Vth1 slightly larger than “0” and Vth2 slightly smaller than “0”, respectively. In order to avoid complication, the comparison voltage is shown as "0".

The relationship between the differentiated waveform signal (ne ′) output from the differentiating circuit 64 and the C and D comparators 65 and 66 is based on the rotation angle signal and the A and B comparators 62 and
This is the same as the relationship with 63. That is, when the differentiated waveform signal output from the differentiating circuit 64 appears on the plus side, the signal level of the output terminal of the C comparator 65 becomes H level, and when the differentiated waveform signal output from the differentiating circuit 64 appears on the minus side, The signal level of the output terminal of the D comparator 66 becomes H level. In other words, the output terminal of the C comparator 65 goes high when the signal level of the rotation angle signal is increasing, and the output terminal of the D comparator 66 goes high when the signal level of the rotation angle signal is decreasing. Level.

Therefore, the output of the A AND circuit 76 is
When the waveform of the rotation angle signal appears on the plus side and the signal level of the rotation angle signal is increasing, the level becomes H level. The output of the B AND circuit 77 becomes H level when the waveform of the rotation angle signal appears on the plus side and the signal level of the rotation angle signal is decreasing. The output of the C-AND circuit 78 becomes H level when the waveform of the rotation angle signal appears on the negative side and the signal level of the rotation angle signal is decreasing. The output of the D-AND circuit 79 is set to H level when the waveform of the rotation angle signal appears on the minus side and the signal level of the rotation angle signal is increasing.
Level.

During the period in which the outputs of the AND circuits 76 to 79 of A to D are at the H level, the corresponding counters 81 to 84 of A to D count up. Therefore, the count values a to d of the counters 81 to 84 of A to D are obtained by measuring a period in which any of the above conditions is satisfied.

In FIG. 12, the period [t1, t2] is a period that satisfies the above conditions, and the A counter 81 counts up. Then, the count value in the period [t1, t2] is held until an H-level signal is input to the reset terminal (RST) of the A counter 81. Period [t
[2, t3] is a period that satisfies the above condition,
The counter 82 counts up. And time t
3, the signal ne + changes from H level to L level.
The comparison circuit 85 compares the count value a of the A counter 81 with the count value b of the B counter 82. If a> b, the output terminal (true) is set to the H level. On the other hand, if a ≦ b, the output terminal (false) is set to the H level. Period [t] in FIG.
[1, t3], since a> b, the output terminal (true) is at the H level. As a result, the set terminal (S) of the SR latch goes high, so that the output terminal (Q) of the SR latch 87, that is, the REVD signal goes high at time t3 as shown in FIG. At time t3
, The completion terminal of the A comparison circuit 85 becomes H level, and the reset terminals (RS
T) becomes H level, so that the counters 81 and 8 of A and B
The count values a and b of 2 are reset to “0”.

The period [t3, t4] is a period that satisfies the above conditions, the C counter 83 determines that the period [t4, t5] is a period that satisfies the above conditions,
The D counter 84 counts up. At time t5, the signal ne- is inverted from the H level to the L level, so that at time t5, the B comparison circuit 86 determines the count value c of the C counter 83 and the count value d of the D counter 84.
In this case, since c <d, the signal level of the output terminal (true) becomes H level. by this,
Since the set terminal (S) of the SR latch 87 goes high, the output terminal (Q) of the SR latch 87 is held high. That is, the REVD signal remains at the H level.

After time t5, at the point indicated by the symbol α, the rotation direction of the output shaft 1a of the engine 1 is reversed. Therefore, in the period [t6, t7], the count value c of the C counter 83 and the count value d of the D counter 84 are reversed. Therefore, the B comparison circuit 86 sets the output terminal (false) to the H level at time t7. Therefore, the SR latch 87
Reset terminal (R) goes high, and the SR latch 8
7 output terminal (Q) is inverted to L level. That is, R
The signal level of the EVD signal is inverted to the L level. That is, at time t7, it is determined that the rotation direction of the output shaft 1a of the engine 1 has been reversed.

The second determination circuit determines the rotation direction of the output shaft 1a of the engine 1 based on the waveform of the rotation angle signal even when there is no missing tooth portion, and determines whether the output shaft 1a is rotating forward. If there is, the REVD signal is set to "1", and if the motor rotates in the reverse direction, the REVD signal is reset to "0". Therefore, in the above-described determination processing of S700 and S730 in FIG. 7, REV which is the output signal from the second determination circuit is used.
If it is determined whether or not the D signal has been inverted, the engine 1
Can be determined whether or not the rotation direction of the output shaft 1a is reversed.

Next, the engine ECU 1 according to the second embodiment will be described.
The effect of 9 will be described. In the second embodiment, when it is determined that the missing tooth portion exists in the rotation angle signal (S610 in FIG. 6: YES), the output shaft 1a of the engine 1 is determined from the rotation angle signal immediately after the missing tooth portion. Engine 1 output shaft 1 based on the output result of the first determination circuit for determining the rotation direction
The rotation direction of a is determined (S620 in FIG. 6). Also,
If it is determined that there is no missing tooth portion (S610 in FIG. 6: NO), the output result of the second determination circuit that determines the rotation direction of the output shaft 1a of the engine 1 from the waveform shape of the rotation angle signal. The reversal of the rotation direction of the output shaft 1a of the engine 1 is determined based on the determination (S700, S730 in FIG. 7). If it is determined that the motor is rotating in the reverse direction, the rotation angle signal is determined to be abnormal (S640 in FIG. 6, S72 in FIG. 7).
0, S750).

In this case, as in the first embodiment, the process based on the rotation angle signal is prohibited by the prohibition process shown in FIG. 5 (S310 in FIG. 5). As a result, since the output shaft 1a of the engine 1 is connected to the M / Gs 3, 5, the rotation angle signal generated when the output shaft 1a is reversely rotated by the load from the connected M / Gs 3, 5 is abnormal. And the output shaft 1 of the engine 1
It is possible to avoid the inconvenience caused by executing the processing based on the rotation angle signal output when a is rotated in the reverse direction.

The engine ECU 1 of the second embodiment
In No. 9, it is determined that reverse rotation of the output shaft 1a of the engine 1 has been performed, and once the rotation angle signal abnormality flag XK (ne) has become “1”, it is determined that a missing tooth portion exists (see FIG. 6). (S610: YES), it is determined that the rotation is in the forward direction (S620: YES in FIG. 6), and only after that, the rotation angle signal abnormality flag XK (ne) becomes “0”. That is, once the rotation angle signal abnormality flag XK (ne) once becomes "1", even if it is determined that the rotation direction of the output shaft 1a of the engine 1 is reversed and the engine 1 is rotated forward (FIG. 7). S70 inside
0: YES, S730: NO), the rotation angle signal abnormality flag XK (ne) is not reset to “0” (FIG. 7).
See S710 and S740 in FIG.

This is because when it is determined that the output shaft 1a of the engine 1 is rotating in the forward direction, it is determined whether or not a missing tooth portion exists in the rotation angle signal. It is determined whether the rotation is temporary normal rotation when reverse rotation occurs alternately, or whether the rotation is normal rotation by operation of the engine 1 or forced rotation by a starter or the like. As a result, it is possible to prohibit processing based on the rotation angle signal that is output when the minute rotation of the output shaft 1a of the engine 1 is alternately performed in the normal rotation and the reverse rotation. It can be avoided reliably.

Furthermore, in the second embodiment, when the rotation angle signal is normally output (S650: YES in FIG. 6), but the reference signal is not output (FIG. 6). (NO in S660), it is determined that the reference signal system including the G sensor 33 is abnormal, and the reference signal system abnormality flag X (g) is set to “1”. This makes it possible to determine that the reference signal is not output due to, for example, a failure of the G sensor 33 or the like.

In the second embodiment, when the rotation angle signal is not output (S600: NO in FIG. 6) and only the reference signal is output (S770: YE in FIG. 6).
S), it is determined that the rotation angle signal system including the NE sensor 31 is abnormal, and “1” is set to the rotation angle signal system abnormality flag X (ne). This is because, when only the reference signal is output, the rotation angle signal output at a predetermined rotation position set at a small interval with respect to the reference position is naturally output. Thereby, disconnection of the NE sensor 31 can be determined.

Then, not only when the rotation angle signal is determined to be abnormal, that is, when the rotation angle signal abnormality flag XK (ne) is set to "1", the rotation angle signal system including the NE sensor 31 When it is determined that the rotation angle signal is abnormal, that is, when “1” is set in the rotation angle signal system abnormality flag X (ne), the processing based on the rotation angle signal is prohibited (S310 in FIG. 5). Is the first
This is for the same reason as in the embodiment. That is, execution of processing based on the rotation angle signal having low reliability is prohibited.

In the first embodiment, the abnormality of the rotation angle signal from the NE sensor 31 is determined based on the reference signal from the G sensor 33. On the other hand,
In the embodiment, the rotation direction of the output shaft 1a of the engine 1 is determined based on the waveform of the rotation angle signal, and the abnormality of the rotation angle signal is determined based on the rotation direction. Therefore, it is advantageous in that the rotation angle signal output when the output shaft 1a of the engine 1 is rotating in the reverse direction due to, for example, a load from the M / G 3, 5 can be determined as an abnormal signal. In addition, since the reference signal is not used as a reference for determining abnormality, it is possible to determine the abnormality of the G sensor 33 that outputs the reference signal together (S660 to S680 in FIG. 6).

The engine ECU 1 of the second embodiment
The signal abnormality determination processing shown in FIGS. 6 and 7 executed by the module 9 corresponds to the processing as “abnormality determination means”, and the prohibition processing shown in FIG. 5 corresponds to the processing as “processing prohibition means”.
Also, the first type described with reference to FIGS.
And the second determination circuit corresponds to “rotation direction determination means”. [Others] (1) In the second embodiment, the rotation direction of the output shaft 1a of the engine 1 is determined using the second determination circuit as described with reference to FIGS. A similar determination can be made by a circuit.

Next, a third determination circuit will be described with reference to FIGS. 13 and 14 as another determination circuit. This determination method also attempts to determine the rotation direction based on the shape of the waveform of the rotation angle signal, and is different from the point that it focuses on one of the waveforms appearing on the plus side or the minus side of the rotation angle signal. Is the same as that of the above-described second determination circuit. In the second embodiment, in the waveform appearing on the plus side or the minus side of the rotation angle signal, the increase period and the decrease period of the signal level are compared.

On the other hand, in the determination method described below, the inclination of the waveform appearing on the plus side or the minus side of the rotation angle signal is compared. First, an outline will be described with reference to FIG. In FIG. 4A, one of the waveforms appearing on the plus side is shown.
Focusing on one, it can be seen that the signal level increases slowly and decreases instantaneously. That is, when the output shaft 1a of the engine 1 is rotating forward, focusing on one of the waveforms appearing on the plus side, the absolute value of the slope at a predetermined point in the increasing period of the signal level is equal to the absolute value of the slope in the decreasing period. It is smaller than the absolute value of the slope at the time.
Similarly, in FIG. 4B, the absolute value of the slope at a predetermined time during the increase period is larger than the absolute value of the slope at the predetermined time during the decrease period. Therefore, the direction of rotation of the output shaft 1a of the engine 1 can be determined by comparing the absolute values of the inclinations at these predetermined times.

Hereinafter, the engine 1
The third determination circuit for determining the rotation direction of the output shaft 1a will be described. Note that only portions different from the second determination circuit described in the second embodiment will be described. The third determination circuit includes the LPFs 61, A, and B in the circuit configuration shown in FIG.
The two comparators 62 and 63 and the differentiating circuit 64 are provided.

As shown in FIG. 13, four data latches 101, 102, 103 and 104, two comparison circuits 105 and 106, and an SR latch 107 are provided. Four data latches 101, 102, 103, 10
4, the A data latch 101, the B data latch 102,
The C data latch 103 and the D data latch 104 will be distinguished below. Also, the two comparison circuits 105 and 10
6 are described as an A comparison circuit 105 and a B comparison circuit 106, and are distinguished below.

A latch terminal of data latch 101 and B
The signal (ne +) output from the A comparator 62 is input to the latch terminal of the data latch 102. The signal (ne−) output from the B comparator 63 is input to the latch terminal of the C data latch 103 and the latch terminal of the D data latch 104.

The data latches 101 to 101 of A to D
The differential waveform signal output from the differentiating circuit 64 is input to the data input terminal (D) of the terminal 04. A data latch 1
01 indicates that the signal (ne +) from the A comparator 62 is L
The signal level of the data input terminal (D) at the time when the level is inverted from the level to the H level, that is, when the ne + rises, is held at the output terminal until the signal level of the reset terminal (RST) becomes the H level. Here, the signal held at the output terminal is data a.

The B data latch 102 changes the signal level of the data input terminal (D) when the signal (ne +) from the A comparator 62 is inverted from the H level to the L level, and sets the signal level of the reset terminal (RST) to the H level. Hold it at the output terminal until it reaches the level. Here, the signal held at the output terminal is data b.

Similarly, the C data latch 103 outputs the signal from the D data latch 104 when the signal (ne−) from the B comparator 62 is inverted from L level to H level.
Is the data input terminal (D) at the time when the signal (ne−) from the B comparator 62 is inverted from H level to L level.
Is held at the output terminal until the signal level of the reset terminal (RST) becomes H level. The signal held at the output terminal of the C data latch 103 is data c,
The signal held at the output terminal of the D data latch 104 is data d.

An output terminal of the A data latch 101 is connected to a first input terminal (input a) of the A comparison circuit 105, and a B data latch 1 is connected to a second input terminal (input b).
02 output terminal is connected. The comparison timing terminal of the A comparison circuit 105 includes the A comparator 62
The signal (ne +) output from is input. When the signal level of the signal ne + at the comparison timing terminal changes from H level to L level, the A comparison circuit 105
And the absolute value of the signal level input to the second two input terminals is compared. That is, | a | and | b | are compared. Here, when the absolute value of the data a is smaller than the absolute value of the data b, the signal level of the output terminal (true) is set to the H level. On the other hand, when the absolute value of the data a is greater than or equal to the absolute value of the data b, the signal level of the output terminal (false) is set to the H level.

The first input terminal (input c) of the B comparison circuit 106 is connected to the output terminal of the C data latch 103, and the second input terminal (input d) is connected to the D data latch 104. Output terminal is connected. The signal (ne−) output from the B comparator 63 is input to the comparison timing terminal of the B comparison circuit 106.
The B comparison circuit 106 outputs a signal ne-
At the time when the signal level changes from the H level to the L level,
The absolute values of the signal levels input to the first and second input terminals are compared. That is, | c | and | d | are compared. Here, when the absolute value of the data c is larger than the absolute value of the data d, the signal level of the output terminal (true) is set to H
Level. On the other hand, when the absolute value of the data c is equal to or less than the absolute value of the data d, the signal level of the output terminal (false) is set to H
Level.

The output terminals of the A and B comparison circuits 105 and 106 are connected to two OR circuits 108 and 109 having two inputs. These two OR circuits 108 and 109 are described as an A OR circuit 108 and a B OR circuit 109 and are distinguished below. The output terminal (true) of the A comparison circuit 105 is connected to one input terminal of the A OR circuit 108, and the output terminal (true) of the B comparison circuit 106 is connected to the other input terminal. The output terminal (false) of the A comparison circuit 105 is connected to one input terminal of the B OR circuit 109, and the output terminal (false) of the B comparison circuit 106 is connected to the other input terminal.

The output terminal of the A OR circuit 108 is
The set terminal (S) of the SR latch 107 is connected, and the output terminal of the B OR circuit 109 is connected to the reset terminal (R) of the SR latch 107. This SR latch 107
Holds the signal level of the output terminal (Q) at the H level when the signal level of the set terminal (S) becomes the H level,
Conversely, when the signal level of the reset terminal (R) becomes H level, the signal level of the output terminal (Q) is held at L level.

Therefore, when one of the output terminal (true) of the A comparison circuit 105 and the output terminal (true) of the B comparison circuit 106 becomes H level, the signal level of the set terminal (S) of the SR latch 107 becomes H level. Therefore, the output terminal (Q) is maintained at the H level. Also, A
Output terminal of comparison circuit 105 (false) or 10 of B comparison circuit
When one of the output terminals 6 (false) goes to H level, the reset terminal (R) of the SR latch 107 goes to H level, so that the output terminal (Q) is held at L level.

Now, the operation of the third determination circuit will be described with reference to the time chart of FIG. 14. If the ne + signal is inverted to the H level at time t1, the A data latch 101 sets ne 'to ne'.
Is latched as data a. When the ne + signal is inverted to the L level at time t2, the B data latch 102 latches the signal level of ne 'as data b. Immediately thereafter, the A comparison circuit 105 compares the absolute value of the data a with the absolute value of the data b. Where |
Since a | <| b |, the A comparison circuit 105 sets the output terminal (true) to the H level. Then, the SR latch 107
Set terminal (S) goes high, and the output terminal (Q)
Becomes H level. That is, at time t2, the REVD signal is held at the H level.

Subsequently, when the ne- signal is inverted to the H level at time t3, the C data latch 103 latches the signal level of ne 'as data c. When the ne- signal is inverted to L level at time t4, the D data latch 1
04 latches the signal level of ne 'as data d. Immediately after that, the B comparison circuit 106 outputs the data c
Is compared with the absolute value of the data d. Where | c |
> | D |, the B comparison circuit 106 sets the output terminal (true) to the H level. Then, the set terminal (S) of the SR latch 107 becomes H level, and the signal level of the output terminal (Q) is held at H level. That is, at time t4
In this case, the REVD signal is held at the H level.

Then, after time t4 (the symbol α in FIG. 14)
(At the time indicated by), the rotation direction of the output shaft 1a of the engine 1 is reversed. Therefore, data c latched at time t5 and data d latched at time t6 are | c | ≦ |
d |, and the B comparison circuit 106 sets the output terminal (false) to the H level. Then, the reset terminal (R) of the SR latch 107 becomes H level, and the output terminal (Q)
Is held at the L level. That is, the time t
At 6, the REVD signal is inverted to L level.

Therefore, in the second embodiment,
Even if such a third determination circuit is used instead of the second determination circuit, the determination processing in S700 and S730 in FIG.
By determining the inversion of the REVD signal, it is possible to determine the inversion of the rotation direction of the output shaft 1a of the engine 1. (2) The second determination circuit in the second embodiment,
If the above-described third determination circuit is used as (1), it is possible to determine not only the inversion of the output shaft 1a of the engine 1 but also the rotation direction thereof. If only the reversal of the output shaft 1a of the engine 1 is determined, the following method can be used. When the output shaft 1a of the engine 1 is inverted, as shown in FIG.
Since the e- signal goes to the H level twice in succession, it is determined whether the ne + signal or the ne- signal goes to the H level twice in succession. S7 in FIG. 7 of the second embodiment
In 00 and S730, only the reversal of the rotation direction is determined, so such a method can also be used. (3) However, in the above-described second determination circuit and third determination circuit, the reversal of the rotation direction of the output shaft 1a of the engine 1 is focused on one of the waveforms appearing on the plus side or the minus side of the rotation angle signal. I was going. That is, it is assumed that the plus side or the minus side of the projection corresponding waveform is completely output.

However, it is conceivable that the output shaft 1a of the engine 1 is reversed during the output of the waveform on the plus side or the minus side. This is like the rotation angle signal shown in FIG. 16 and FIG. Therefore, the above-mentioned method is supplemented so as to be able to cope with any case.

For example, as shown in the time chart of FIG. 16, when the rotation angle signal is discontinuous, that is, when the right derivative and the left derivative do not match (at time t in FIG. 16).
1 and t2), the rotation direction of the output shaft 1a of the engine 1 is also reversed. In such a case, since ne 'does not continuously change, if such an intermittent change of ne' is detected, it is possible to determine the reversal of the rotation direction of the output shaft 1a of the engine 1. The intermittent change of ne 'appears as a waveform in which ne' reverses instantaneously as shown in FIG. Therefore, such an inversion may be detected.

As shown in the time chart of FIG. 17, the rotation direction of the output shaft 1a of the engine 1 may be reversed even if the rotation angle signal is continuous. For example, there is a case where the rotation direction of the output shaft 1a of the engine 1 is reversed near the minimum value or the maximum value of the rotation angle signal.

This can be determined based on the following facts. That is, the waveform of the rotation angle signal corresponding to one protrusion gradually increases from “0” for a predetermined period (hereinafter, referred to as “first period”) in the case of the forward rotation, and rapidly decreases on the negative side. After the period (hereinafter, referred to as “second period”), the voltage gradually increases to “0” during a period substantially similar to the first period (hereinafter, referred to as “third period”). Here, during the period in which the second period and the third period are added, the differential waveform signal ne ′ becomes “0” only twice. Furthermore, since the second period is a very short period, a period obtained by adding the second period and the third period may be regarded as being the same as the first period.

Therefore, the first period is counted, and after the end of the first period, until the same time as the first period elapses, the differentiated waveform signal ne 'is set to "0" only twice. It is sufficient to determine whether or not. That is, if the value becomes "0" once or three times, it can be determined that the image has been inverted. For this determination, it is conceivable to use a zero-crossing determination circuit or an edge detection circuit using the differential waveform signal ne 'as an input signal. Although the case of forward rotation has been described here, the same applies to the case of reverse rotation.

For example, in FIG. 17, from time t1 to time t2
The first period [t1, t2] until the time t is measured by the timer A, and the output from the zero-crossing determination circuit is output during the period [t2, t3] in which the time T measured by the timer A elapses from the time t2. , Counter A. Since the output shaft 1a of the engine 1 is inverted at the time indicated by the symbol α in FIG. 17, the value of the counter A becomes “3” at the time t3, and the inversion of the output shaft 1a is determined.

Similarly, in the period [t4, t5], the counter A becomes "1", so it is determined that there is inversion, and the period [t4, t5]
6, t7], the counter B becomes “2”, so it is determined that there is no inversion. (4) In the first and second embodiments, after the rotation angle signal is determined to be abnormal by the signal abnormality determination processing described above, the inhibition processing shown in FIG. 5 is performed based on the rotation angle signal. Execution of the process is prohibited, and the inconvenience associated with the execution of the process can be reliably avoided. However, for a short period of time until the signal abnormality determination processing is performed and the rotation angle signal is determined to be abnormal, processing based on the abnormal rotation angle signal may be performed. In this case, particularly, an ignition process and an injection process for ignition and fuel injection for the engine 1 are executed, and the ignition process,
If a diagnosis that is directly connected to ignition and fuel injection is executed during the injection processing, fuel injection and ignition are actually performed. If such fuel injection or ignition is performed, for example, when the engine 1 is rotated in the reverse direction, the worst case in which the engine 1 is broken is caused.

Therefore, it is conceivable to appropriately prohibit the ignition diagnosis and the fuel injection diagnosis during the ignition processing and the injection processing. This will be described. FIG.
Shows a configuration of only the ignition system inside the engine ECU 19. The abnormality determination of the rotation angle signal, which is a feature of the present invention, is performed based on the rotation angle signal (ne) and the reference signal (g) input to the engine ECU 19.
10, the rotation angle signal (n
e) and the reference signal (g) are input to the ignition IC 113 via the waveform shaping circuit 112. Then, the CPU 114
, A predetermined signal is calculated, and the igniter is energized accordingly. That is, the engine 1 is ignited without waiting for the result of the abnormality determination of the rotation angle signal. Therefore, it is desirable to appropriately prohibit the ignition diagnosis in the ignition processing at least for a short period until the abnormality of the rotation angle signal is determined.

Since the ignition processing has been well known, a brief description thereof will be given here. This ignition process is for a four-cylinder engine. FIG.
As shown in FIG. 8, the rotation angle signal and the reference signal
1 is input to the waveform shaping circuit 112. The waveform-shaped signal (ne36, G2) is input to the ignition IC 113. The rotation angle signal (ne) is generated every 10 degrees, and has two missing teeth portions on the way. A signal obtained by shaping the waveform of the rotation angle signal (ne) is a ne36 signal (see FIG. 19).

In the ignition IC 113, the ne12 signal obtained by dividing the ne36 signal by 3 (see FIG. 19), the missing tooth determination signal which becomes H level when the missing tooth portion of the ne36 signal is determined (see FIG. 19), and the ne12 signal are output. TD of specific cylinder based on
C (Top Dead Center) signal (see FIG. 20), G2O inverted in synchronization with the fall of the TDC signal depending on whether there is a G2 signal within a predetermined angle from the missing tooth part determination signal
A signal is created (see FIG. 20) and output to CPU 114. The CPU 114 calculates the ne12 signal, the TDC signal, the G2
An IGT1I signal and an IGT2I signal are calculated based on the O signal and output to the ignition IC 113. In the ignition IC 113, the IGT1I signal and the IGT2I signal and the distribution signals (distribution # 1, 4 signals, distribution # 2, 3 signals)
IG, which is an ignition signal for each of the four cylinders based on
T1O signal, IGT2O signal, IGT3O signal, IGT
The 4O signal is output to the igniter (see FIG. 22). Thus, ignition is performed on each cylinder in a predetermined order.

As described above, in the ignition process, a TDC signal is created based on the rotation angle signal (ne), and a G2O signal is created based on the reference signal (g). Then, ignition is performed based on the TDC signal and the G2O signal. Therefore, as shown in the flowchart of FIG. 21, first, it is determined whether or not the TDC signal and the G2O signal have a predetermined relationship (S810). This determination may be made using a value of a crank counter based on the TDC signal and the G2O signal. Here, when there is no predetermined relationship (S8
10: NO), the ignition diagnosis is prohibited (S820).
This prevents the ignition from actually occurring. On the other hand, when the predetermined relationship is established (S810: YES), the ignition diagnosis is permitted (S830).

In this manner, the processing based on the abnormal rotation angle signal is not executed even for a short period until the rotation angle signal is determined to be abnormal. As a result, the worst case in which the engine 1 is broken by fuel injection or ignition can be prevented.

Although the ignition processing has been described here, the fuel injection processing is also performed on the basis of the TDC signal and the G2O signal, so that the fuel injection diagnosis may be prohibited in a similar manner. (5) The first determination circuit described with reference to FIG. 8 determines the missing tooth portion of the rotation angle signal, determines whether or not the waveform of the rotation angle signal immediately after that appears on the plus side, and determines whether the engine 1 Is to determine the rotation direction of the output shaft 1a. Similarly, as a method of determining the missing tooth portion and determining the rotational direction of the output shaft 1a, at least three missing teeth are provided on the signal rotor, and the missing tooth position is opposite to the forward rotation of the signal rotor. If the rotation is asymmetric, the normal rotation and the reverse rotation can be determined by counting the protrusions between the missing teeth. For example, as shown in FIG.

Similarly, at least three projections may be provided on the signal rotor, and the size of the projection itself may be asymmetrical when the signal rotor is rotated in the normal direction and in the opposite direction. Further, the interval between the projections may be asymmetrical when the signal rotor is rotated in the normal direction and in the opposite direction.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a hybrid vehicle according to first and second embodiments.

FIG. 2 is a flowchart illustrating a signal abnormality determination process executed by an engine ECU according to the first embodiment.

FIG. 3A is an explanatory diagram showing a signal rotor and a NE sensor, and FIG. 3B is an explanatory diagram showing a correspondence between a protrusion of the signal rotor and a rotation angle signal.

FIG. 4 is an explanatory diagram showing a waveform of a rotation angle signal output from an NE sensor.

FIG. 5 is a flowchart illustrating a prohibition process executed by the engine ECU according to the first and second embodiments.

FIG. 6 is a first half of a flowchart illustrating a signal abnormality determination process executed by an engine ECU according to a second embodiment.

FIG. 7 is a second half of a flowchart showing a signal abnormality determination process executed by the engine ECU of the second embodiment.

FIG. 8 is a circuit diagram illustrating a first determination circuit.

FIG. 9 is a time chart showing signals of a predetermined portion of the first determination circuit.

FIG. 10 is a circuit diagram showing a second determination circuit.

FIG. 11 is a circuit diagram showing a second determination circuit.

FIG. 12 is a time chart showing signals of a predetermined portion of the second determination circuit.

FIG. 13 is a circuit diagram illustrating a third determination circuit.

FIG. 14 is a time chart showing signals of a predetermined portion of a third determination circuit.

FIG. 15 is an explanatory diagram showing a method of determining reversal of the output shaft of the engine.

FIG. 16 is an explanatory diagram showing a method of determining reversal of the output shaft of the engine.

FIG. 17 is an explanatory diagram showing a method for determining the reversal of the output shaft of the engine.

FIG. 18 is a block diagram showing a schematic configuration of an ignition system in the engine control device.

FIG. 19 is an explanatory diagram showing signals for an ignition process.

FIG. 20 is an explanatory diagram showing signals for an ignition process.

FIG. 21 is a flowchart showing an ignition process.

FIG. 22 is an explanatory diagram illustrating a method of determining the rotation direction of the output shaft of the engine based on the missing teeth.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine 1a ... Output shaft 3, 5 ... Motor / generator 7 ... Output shaft 9 ... Differential gear 11R, 11L ...
Drive wheels 13, 15 ... Inverter 17 ... Motor /
Generator control device 19 Engine control device 21 Intake path 23 Throttle valve 25 DC motor 31 NE sensor 33 G sensor 41 Signal rotor 41 a Projection 41 b Chipped teeth 51, 61, 111 Low-pass filters 52, 53 , 62, 63, 65, 66 ... comparator 54 ... missing tooth determination circuit 55, 56 ... latch 57, 87, 107 ... set reset latch 58, 69 ... pull-up resistor 59 ... negation circuit 64 ... differentiation circuit 75 ... oscillator 76, 77, 78, 79 ... AND circuit 81, 82, 8
3, 84 counter 85, 86, 105, 106 comparison circuit 88, 89, 108, 109 OR circuit 101, 102, 103, 104 data latch 112 waveform shaping circuit 113 ignition I
C 114: CPU

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 29/02 B60K 9/00 Z 321 F02P 5/15 E F02P 5/15 F-term (Reference) 3G022 AA03 EA01 EA08 GA01 3G084 AA00 AA03 BA13 BA16 DA00 DA27 DA28 DA30 DA31 DA33 EB22 EC03 FA00 FA38 FA39 3G092 AA01 BA10 BB01 BB10 CA01 EA14 FA33 FB06 FB07 HE03Z HE04Z 3G093 AA07 BA04 BA10 BA11 BA12 PI12 PU12 FA12 PU12 FA07 PI12 PU27 PV10 QN12 QN24 RB08 RB11 RE01 RE06 RE12 RE13 SE04 SE05 TB01 TE10 TO01 TO21 TO23

Claims (10)

[Claims] 1. A hybrid vehicle having both a motor used as a driving power source and an internal combustion engine used for driving at least one of a driving power source and a generator for generating electric power for rotating the motor. And
Used for a hybrid vehicle that stops operating the internal combustion engine under predetermined conditions, and detects that the output shaft of the internal combustion engine has reached a plurality of predetermined rotational positions with respect to one rotation of the output shaft. A rotation angle signal output from the rotation position detection means, and that the output shaft of the internal combustion engine has reached a reference position set for one rotation of the output shaft at intervals wider than the interval of the predetermined rotation position. A reference signal output from a reference position detecting means to be detected is input, and at least in the information processing apparatus that executes a predetermined process based on the rotation angle signal, only the rotation angle signal is output When the reference signal is not output, abnormality determination means for determining that the output rotation angle signal is abnormal; and when the rotation angle signal is abnormal by the abnormality determination means, An information processing apparatus, comprising: a process prohibition unit that prohibits a process based on the rotation angle signal when it is determined that the rotation angle signal has been detected. 2. The information processing apparatus according to claim 1, wherein the abnormality determination unit further includes at least one of an appropriate signal even when the rotation angle signal and the reference signal are output. An information processing apparatus characterized by determining that the output rotation angle signal is abnormal when not output at the timing. 3. The information processing apparatus according to claim 1, wherein the abnormality determination unit further includes the rotation control unit configured to output the rotation signal when the rotation angle signal is not output and only the reference signal is output. An information processing apparatus configured to determine that a signal system including a position detecting unit is abnormal. 4. The information processing apparatus according to claim 3, wherein the processing prohibiting means determines that the signal system including the rotational position detecting means is abnormal by the abnormality determining means, and thereafter, executes the rotation. An information processing apparatus configured to prohibit processing based on an angle signal. 5. A hybrid vehicle having both a motor used as a driving power source and an internal combustion engine used for driving at least one of a driving power source and a generator for generating electric power for rotating the motor. And
Used in a hybrid vehicle that stops the operation of the internal combustion engine under predetermined conditions, from a rotational position detecting unit that detects that the rotational position of the output shaft of the internal combustion engine has reached a predetermined rotational position set at a plurality of locations. An information processing device that executes a predetermined process based on at least the rotation angle signal; a rotation direction determination that determines a rotation direction of an output shaft of the internal combustion engine; Means, even when the rotation angle signal is output, if the rotation direction determination means determines that the output shaft of the internal combustion engine is rotating in the reverse direction, the output rotation is output. Abnormality determination means for determining that the angle signal is abnormal; and processing based on the rotation angle signal is prohibited when the abnormality determination means determines that the rotation angle signal is abnormal. The information processing apparatus characterized by comprising a process inhibiting means for. 6. The information processing apparatus according to claim 5, wherein a toothless portion for determining that an output shaft of the internal combustion engine has reached a reference rotation angle is provided with the toothless portion as the output shaft rotates. The predetermined rotation position is set so as to appear in the angle signal, and further includes a missing tooth determination unit that determines whether the missing tooth portion is present in the rotation angle signal. After once determining that the rotation angle signal is abnormal, even if it is determined by the rotation direction determining means that the output shaft of the internal combustion engine is rotating forward, the missing tooth determining means The information processing apparatus is configured to determine that the rotation angle signal is abnormal until it is determined that a missing tooth portion exists in the rotation angle signal. 7. The information processing apparatus according to claim 6, wherein the rotation position of the output shaft of the internal combustion engine is set to a reference position set at a wider interval than the predetermined rotation position together with the rotation angle signal. A reference signal output from a reference position detecting means for detecting that the output shaft of the internal combustion engine is rotating forward by the rotation direction determining means. When the missing tooth determining means determines that the missing tooth portion exists in the rotation angle signal, and the reference signal is not output, the signal system including the reference position detecting means is abnormal. An information processing apparatus characterized in that it is configured to judge. 8. The information processing apparatus according to claim 7, wherein the abnormality determining means further detects the rotation position when the rotation angle signal is not output and only the reference signal is output. An information processing apparatus configured to determine that a signal system including the means is abnormal. 9. The information processing apparatus according to claim 8, wherein the processing prohibiting unit is configured to determine that the signal system including the rotational position detecting unit is abnormal by the abnormality determining unit. An information processing apparatus configured to prohibit processing based on an angle signal. 10. An engine control device configured using the information processing device according to claim 1, wherein the rotation angle signal and the reference signal are provided. It is configured to execute an ignition process and a fuel injection process of the internal combustion engine based on the relationship between the signal based on the rotation angle signal and the signal based on the reference signal in the ignition process and the fuel injection process. An engine control device comprising: an ignition injection prohibiting unit that prohibits ignition and fuel injection to the internal combustion engine by prohibiting a diagnosis related to ignition and fuel injection to the internal combustion engine when there is no diagnosis.