JP3887979B2 - Information processing apparatus 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

[0001]
BACKGROUND 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 an internal combustion engine of a hybrid vehicle that stops operation of the internal combustion engine under a predetermined condition.
[0002]
[Prior 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, the vehicle travels using a motor as a travel power source. Such an electric vehicle has been proposed.
[0003]
However, since the electric vehicle uses only the electric power charged in the battery in advance, there is a drawback that the cruising distance is short. Therefore, in recent years, the hybrid type having both the internal combustion engine and the motor is used. Vehicles are attracting attention.
Various types of hybrid vehicles have been proposed. The generator is driven by the internal combustion engine, the motor is rotated by the generated power, and the rotation output of the motor is transmitted to the wheels. Series type that drives the wheel only by the motor, parallel type that gives the driving force to the wheel by both the internal combustion engine and the motor, and the output of the internal combustion engine according to the running state of the vehicle, There are parallel series types that are used only for driving a generator for a motor, or used for driving a wheel together with the output of the motor.
[0004]
In such a hybrid type vehicle, the operation of the internal combustion engine is stopped and the generation of noise and exhaust gas is suppressed during a period when the driving of the generator for rotating the motor by the internal combustion engine or the driving of the wheels is not particularly required. Can be considered. For example, Japanese Patent Application Laid-Open No. 9-322305 discloses a technique for compensating for a time lag from the operation stop state of the internal combustion engine to the start of the internal combustion engine with an output on the motor side as a technique related to a hybrid vehicle that travels in various operation modes. Yes. That is, the hybrid vehicle disclosed herein is an example of a vehicle that stops the operation of the internal combustion engine depending on the operation mode.
[0005]
Such operation control of the internal combustion engine is performed by an internal combustion engine control device called an engine ECU (hereinafter referred to as an “engine control device”). This engine control device is used to rotate the output shaft of the internal combustion engine. In general, fuel injection processing and fuel ignition processing are executed based on the rotation angle signal and the reference signal that are output in synchronization. The rotation angle signal is a signal output for grasping 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 (crank shaft), and is usually called a g signal. In general, a plurality of cylinders of an internal combustion engine are identified and ignition processing is performed based on such two-system signals synchronized with the output shaft of the internal combustion engine. Japanese Patent No. 2744627 also discloses a technique for identifying and igniting a plurality of cylinders of an internal combustion engine based on a single rotation angle signal synchronized with the rotation of the output shaft of the internal combustion engine. Further, the engine control apparatus executes not only ignition processing and fuel injection processing, but also predetermined diagnosis processing (hereinafter referred to as “diagnosis”) based on the rotation angle signal.
[0006]
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 forcibly generating the rotation angle signal by rotating the output shaft by, for example, a starter.
[0007]
[Problems to be solved by the invention]
By the way, even when the internal combustion engine is stopped, the output shaft of the internal combustion engine rotates alternately at a slight rotation angle in the forward direction (the direction of rotation when the internal combustion engine is operated) and in the reverse direction due to vehicle vibrations or the like. Alternatively, if the output shaft is connected to a generator or the like, there is a possibility that the output shaft is reversely rotated by a load from the connected generator or the like.
[0008]
Now, the rotation angle signal synchronized with the rotation of the output shaft is passed through a window provided in a disk that rotates in conjunction with the rotation of the output shaft, as disclosed in, for example, Japanese Patent No. 2744627 by an optical sensor. It can be obtained by detecting the projections provided at predetermined intervals around the disk that rotates in conjunction with the rotation of the output shaft, using an electromagnetic sensor.
[0009]
Therefore, if 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 protrusion provided on the disk is near the sensor, the output shaft will rotate. A rotation angle signal is generated as if it were. Similarly, when the output shaft rotates in reverse by a load from a generator, for example, a rotation angle signal is generated as if the output shaft is 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 an operating state or a starting state.
[0010]
However, the control device for an internal combustion engine uniformly executes a process based on the rotation angle signal without distinguishing between normal and abnormal rotation angle signals. The reason is that, unless it 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.
[0011]
If the processing based on such an abnormal rotation angle signal is executed, the following inconvenience occurs. That is, if a diagnosis is executed, it is possible that an erroneous diagnosis is made. This diagnosis includes, for example, a disconnection diagnosis of an air flow meter that is a sensor that detects the amount of air taken into the internal combustion engine, a diagnosis of an oxygen sensor that detects the oxygen concentration in exhaust gas, a diagnosis of a knock sensor that is a kind of vibration pickup, A diagnosis of a water temperature sensor can be considered. In these diagnostics, the operation of the internal combustion engine is a condition, but since the internal combustion engine is actually in a stopped state, an accurate diagnosis is not made. Further, for example, if the fuel injection process, the ignition process, etc. are executed 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.
[0012]
The present invention has been made to solve the above-described problems, and determines whether or not the rotation angle signal output in the operation stop state of the internal combustion engine is abnormal, and is based on the abnormal rotation angle signal. The purpose is to prevent problems caused by processing.
[0013]
[Means for Solving the Problems and Effects of the Invention]
The information processing apparatus of the present invention is used in a hybrid vehicle having both an internal combustion engine and a motor. Here, in a hybrid vehicle having both an internal combustion engine and a motor, a series type hybrid vehicle using only the motor as a driving power source and driving the generator that generates electric power for rotating the internal combustion engine, It includes parallel type and parallel series type hybrid vehicles that use both a motor and an internal combustion engine as a driving power source. The hybrid type vehicle here is one that stops the operation of the internal combustion engine under a predetermined condition. If the internal combustion engine is a hybrid type vehicle used to drive only the generator, the predetermined condition corresponds to a case where the battery is sufficiently charged by the generator, for example. Further, in the case of a hybrid vehicle using both a motor and an internal combustion engine as a driving power source, for example, a case where the vehicle is in a driving state in which sufficient driving force can be obtained with the output of only the motor is applicable.
[0014]
The information processing apparatus of the present invention receives the rotation angle signal output from the rotation position detection means and the reference signal output from the reference position detection means. The rotational position detecting means detects that the output shaft of the internal combustion engine has reached a predetermined rotational position set in plural for one rotation of the output shaft. On the other hand, the reference position detection means detects that the rotational position of the output shaft of the internal combustion engine has become a reference position set for one rotation of the output shaft. This reference position is set at an interval wider than an interval between predetermined rotation positions at which the rotation angle signal is output. As described above, the information processing apparatus is premised on the input of two signals output from the outside in synchronization with the rotation of the output shaft of the internal combustion engine.
[0015]
The information processing apparatus executes predetermined processing based on at least the rotation angle signal. For example, it is conceivable to execute fuel injection control, ignition timing control, etc. for the internal combustion engine based on the rotation angle signal and the reference signal. It is also conceivable to execute various diagnostic processes based on the rotation angle signal. In fuel injection control and ignition timing control, a control amount that is a fuel injection amount or ignition timing is calculated, and the control amount is output to an external fuel injection device or ignition device.
[0016]
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 each means.
Specifically, the rotational position detecting means and the reference position detecting means may be electromagnetic sensors that detect a protrusion around a disk integrally provided on a crankshaft or the like and output a pulse signal. Further, as disclosed in Japanese Patent No. 2744627, it may be an optical sensor that detects a disk window integrally provided on a crankshaft or the like and outputs a pulse signal.
[0017]
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 a predetermined rotation position set at a plurality of locations. For example, 34 rotation positions are set for 360-degree rotation of the crankshaft, and signals are output at the 34 rotation positions. This rotational 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 protrusion missing part called a tooth missing is formed around the disk so that it can be detected that the crankshaft has rotated 360 degrees. For example, if numbers 1 to 34 are assigned to the protrusions around the disk, the first, second, third,..., 34th protrusions are continuously provided every 10 degrees. That is, the first projections are provided at intervals of 30 degrees.
[0018]
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 the three reference positions are output. This reference position also corresponds to, for example, a protrusion around a disk provided integrally with a crankshaft or the like.
[0019]
Particularly, in the information processing apparatus of the present invention, when the abnormality determination unit outputs only the rotation angle signal and does not output the reference signal, the abnormality determination unit determines that the output rotation angle signal is abnormal, If the determination means determines that the rotation angle signal is abnormal, the processing prohibition means prohibits processing based on the rotation angle signal.
[0020]
As described above, even if the internal combustion engine is stopped, if the output shaft rotates alternately in the forward and reverse directions at a slight angle due to vehicle vibration, etc., the output shaft will rotate normally. A rotation angle signal is generated as if it were. Then, a predetermined process is executed based on the rotation angle signal. For example, various diagnoses based on the rotation angle signal are executed. In such a case, inconveniences such as failure to make a normal diagnosis occur.
[0021]
Therefore, in the present invention, attention is paid to 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 rotation angle signal is output by alternately rotating the output shaft of the internal combustion engine in the forward and reverse directions at a minute angle, the reference is 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 rotation angle signal pulses are output, whereas the reference signal pulse is three. If it is assumed that pulses of the rotation angle signal and the reference signal are output at equal intervals, the reference position is set at an interval of 10 times or more of the rotation position at which the rotation angle signal is output.
[0022]
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 minute angle. Therefore, processing based on this rotation angle signal is prohibited. This increases the possibility of avoiding inconvenience due to execution of processing based on an abnormal rotation angle signal that is generated by alternately rotating the output shaft of the internal combustion engine in the forward and reverse directions at a minute angle.
[0023]
Even if the output shaft of the internal combustion engine rotates alternately in the forward direction and the reverse direction at a minute angle, there is a possibility that a reference signal may be output before and after the reference position. Therefore, as shown in claim 2, the abnormality determining means further includes a case where at least one of the signals is not output at an appropriate timing even when the rotation angle signal and the reference signal are output. It may be configured to determine that the output rotation angle signal is abnormal. When “at least one of the signals is not output at an appropriate timing”, for example, the difference between the rotational speed of the internal combustion engine calculated based on the rotational angle signal and the rotational speed of the internal combustion engine calculated based on the reference signal is It can be considered to determine whether or not it is within a predetermined range. That is, no matter which signal is used for the calculation, the rotational speed of the internal combustion engine should match within the error range. In this way, it is possible to reliably determine that the rotational angle signal generated when the output shaft of the internal combustion engine rotates alternately in the forward and reverse directions at a minute angle is abnormal. As a result, processing such as diagnosis based on such a rotation angle signal can be prohibited, and inconveniences associated with processing execution can be reliably avoided.
[0024]
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 determination unit indicates that the signal system including the rotation position detection unit is abnormal. You may comprise so that it may determine. When the reference signal is output, it is considered that the rotation angle signal output at a predetermined rotation position set at a narrow interval with respect to the reference position is naturally output. 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, and it can be determined that the rotation angle signal system including the rotation position detection means is abnormal.
[0025]
In the present invention, it is determined whether the rotation angle signal output from the rotation position detection means is normal or abnormal. If the rotation angle signal is abnormal, processing based on the rotation angle signal is prohibited. Therefore, when the rotation angle signal system is abnormal as described above, the processing based on the rotation angle signal may not be prohibited as long as no rotation angle signal is output. However, for example, a rotation angle signal that is temporarily not output due to a sensor contact failure or the like may be output again. In this case, it is not known when the rotation angle signal is not output again. That is, once it is determined that the rotation angle signal system is abnormal, even if the rotation angle signal is output again, the reliability of the rotation angle signal is lowered.
[0026]
Therefore, as described in claim 4, the processing prohibiting means is configured to prohibit the processing based on the rotation angle signal after that when the abnormality determining means determines that the signal system including the rotational position detecting means is abnormal. It is desirable to do. Thereby, it is possible to avoid execution of processing based on a rotation angle signal with low reliability.
[0027]
By the way, even if the internal combustion engine is in a stopped state, if the output shaft of the internal combustion engine is connected to a generator or the like, there is a possibility that the internal combustion engine may be reversely rotated by a load from the connected generator or the like. Also in this case, the 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, and inconveniences such as no normal diagnosis occur. 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, fuel injection processing, ignition processing, and the like are generally performed. Thus, the output shaft of the internal combustion engine is If fuel injection processing, ignition processing, or the like is executed in the reverse rotation state, the internal combustion engine may be broken.
[0028]
However, in this case, since the reference signal is output at an appropriate timing together with the rotation angle signal, the above-described configuration that determines the abnormality of the rotation angle signal based on the reference signal cannot cope.
Therefore, it is conceivable to employ the configuration shown in claim 5.
[0029]
The information processing apparatus according to claim 5 is used for a hybrid vehicle that uses both an internal combustion engine and a motor, similarly to the information processing apparatus according to claims 1 to 4. The hybrid type vehicle here refers to the same category as the hybrid vehicle described above in the description of claims 1 to 4.
[0030]
Then, the information processing apparatus according to the present invention receives a rotation angle signal output from the rotation position detecting means for detecting that the rotation position of the output shaft of the internal combustion engine has reached a predetermined rotation position set at a plurality of locations. It is assumed that. It is sufficient that at least the rotation angle signal is input, and a reference signal similar to that of the first aspect may be input. Here, “predetermined processing” and “rotation angle signal” are the same as those described above as the description of the information processing apparatus according to claim 1, and are therefore omitted.
[0031]
In the information processing apparatus of 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 output shaft of the internal combustion engine. When it is determined that the rotation is reverse, the abnormality determination unit determines that the output rotation angle signal is abnormal. When the rotation angle signal is determined to be abnormal by the abnormality determination unit, the processing prohibiting unit prohibits processing 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, and processing based on the rotation angle signal is prohibited when the output shaft is rotating in the reverse direction. Note that the rotation direction determination means may be, for example, a sensor that directly detects the rotation direction of the output shaft. Also, a circuit that indirectly determines based on a rotation angle signal or the like may be used. In the latter case, for example, if it is assumed that a rotation angle signal is output from an electromagnetic sensor, it is conceivable to determine the rotation direction based on the waveform of the rotation angle signal. The reason why the rotation angle signal is used is that the determination may be made based on the reference signal as long as the reference signal is input.
[0032]
Thereby, 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. As an example of the load, a load from a generator or the like due to the output shaft being connected to the generator or the like can be considered as an example. However, it is not limited to this. Since the abnormality of the rotation angle signal can be determined in this way, it is possible to avoid inconvenience due to execution of processing based on the rotation angle signal in a state where the output shaft of the internal combustion engine is reversely rotated. it can. Further, even when the forward rotation and the reverse rotation of a minute angle are alternately generated on the output shaft of the internal combustion engine, it is determined that the rotation angle signal is abnormal at least during the reverse rotation, and the rotation angle signal is Processing based on it is prohibited. However, when the forward rotation and the reverse rotation are alternately repeated, the rotation angle signal output during the forward rotation is not determined to be abnormal.
[0033]
Therefore , Inside Check that the rotational positions of multiple locations are set so that the missing teeth for determining that the output shaft of the combustion engine has reached the reference rotational angle appear in the rotational angle signal as the output shaft rotates. Assuming that the rotation angle signal further includes a missing tooth determination unit that determines whether or not a missing tooth portion is present, and after the abnormality determination unit determines that the rotation angle signal is abnormal, Even if it is determined by the rotation direction determination means that the output shaft of the internal combustion engine is rotating in the forward direction, the rotation angle signal is determined as long as the missing tooth portion is not present in the rotation angle signal by the missing tooth determination means. Can be considered to be abnormal.
[0034]
As described above for the explanation of the rotation angle signal, a missing portion of a protrusion called a tooth missing is formed around the disk that generates the rotation angle signal so that a reference rotation angle such as 360 degrees of the crankshaft can be detected. It is common. Therefore, when the forward rotation of the output shaft is determined, it is a temporary forward rotation when the forward rotation and the reverse rotation of a minute angle are alternately generated as described above, or depending on the operation of the internal combustion engine. Whether the forward rotation or forced forward rotation by a starter or the like is determined is determined by determining the missing tooth portion. As a result, the processing based on the rotation angle signal output when the forward rotation and the reverse rotation of a minute angle are alternately generated on the output shaft of the internal combustion engine can be prohibited, and the inconvenience caused by the execution of the processing can be reliably ensured. Can be avoided.
[0035]
Claims To 5 The information processing apparatus shown is based on the assumption that at least a rotation angle signal is input. However, if the apparatus is based on the assumption that a reference signal is input together with the rotation angle signal, 6 When the rotation angle signal determined that the missing tooth portion is present is output by the missing tooth determination means and the output shaft of the internal combustion engine is determined to be rotating forward by the rotation direction determination means, as shown in FIG. If the reference signal is not output, the abnormality determination unit may be configured to determine that the reference signal system including the reference position detection unit is abnormal.
[0036]
That is, the claim To 5 In the illustrated information processing apparatus, normality / abnormality of the rotation angle signal is determined using the rotation direction of the output shaft, the missing teeth, and the like 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, for example, due to disconnection of the sensor, and the reference signal system including the reference position detection means is abnormal. It can be judged that.
[0037]
Claims 7 As shown in FIG. 5, when only the reference signal is output, it is determined that the rotation angle signal system including the rotation position detection means is abnormal, or 8 As shown in FIG. 5, the processing determination means can prohibit the processing based on the rotation angle signal when the rotation angle signal system is determined to be abnormal. Claim 7 as well as 8 The detailed description of the information processing apparatus described in (1) is the same as the description of the information processing apparatus described in claims 3 and 4 above, and will be omitted.
[0038]
In addition, Claims 1-4, 6 ~ 8 The information processing apparatus according to any one of the above performs at least predetermined processing based on the rotation angle signal, but can execute ignition processing and fuel injection processing of the internal combustion engine based on the rotation angle signal and the reference signal. It can be realized as an engine control device.
[0039]
And since it is determined that the rotation angle signal is abnormal by the abnormality determination means described above, the subsequent ignition process and fuel injection process are definitely prohibited, but there is a slight amount until the determination by the abnormality determination means is made. There is a possibility that the ignition process or the fuel injection process for the internal combustion engine may be executed during the period based on the abnormal rotation angle signal. For example, when 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 reverse, it may be considered that the internal combustion engine is broken.
[0040]
Therefore, the claim 9 As shown in FIG. 2, during the execution of the ignition process or the fuel injection process, if the rotation angle signal and the reference signal are not in a predetermined relationship, the ignition and fuel injection to the internal combustion engine is prohibited by prohibiting the diagnosis related to the ignition and fuel injection. It is conceivable to provide ignition injection prohibiting means for prohibiting the injection of fuel. In this case, in addition to the determination process by the abnormality determination means described above, during the ignition process and the fuel injection process, it is further determined whether or not the rotation angle signal and the reference signal are in a predetermined relationship, and the internal combustion engine is ignited. Diagnostic is a prerequisite for fuel injection. As a result, the ignition injection process based on the abnormal rotation angle signal can be appropriately prohibited even during a short period until the determination by the abnormality determination means.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, 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]
First, FIG. 1 is a schematic configuration diagram showing a hybrid vehicle according to the first embodiment.
[0042]
As shown in FIG. 1, the hybrid vehicle according to the first embodiment includes an engine 1 as an internal combustion engine and two motors / generators (hereinafter referred to as “M / G”) 3, which operate as motors or generators. And 5. Here, the output shaft 1a of the engine 1 and the output shafts extending from the rotors of the M / G 3, 5 are respectively connected to predetermined gears of a planetary gear unit (not shown). The output shaft 7 of the M / G 5 is connected to wheels (drive wheels) 11R and 11L of the vehicle via a differential gear 9.
[0043]
Further, the hybrid vehicle of the present embodiment includes a motor / generator control device (hereinafter referred to as M / G • ECU) 17 that controls each of M / G 3 and 5 via two inverters 13 and 15, and An engine control device (hereinafter referred to as engine ECU) 19 for controlling the engine 1 while exchanging control information with the M / G • ECU 17 is provided. In the first embodiment, the engine ECU 19 corresponds to an “information processing device”.
[0044]
Each of the inverters 13 and 15 converts DC power of a battery (not shown) into AC power based on a command from the M / G • ECU 17 and operates the M / G 3 and 5 as a motor. Based on a command from the ECU 17, the M / G 3, 5 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 that operates as a motor operates not only as a battery but also as a generator. It is also driven by power from the other M / G.
[0045]
On the other hand, the intake passage 21 of the engine 1 is provided with a throttle valve 23 for adjusting the intake air amount of the engine 1 (and hence the output of the engine 1). Adjustment is made by a DC motor 25 as an actuator.
[0046]
Further, the engine 1 includes a NE sensor 31 as “rotational position detecting means” for detecting the rotational angle of the output shaft 1a, that is, the rotational angle of the crankshaft of the engine 1, and the rotational position of the output shaft 1a. A G sensor 33 is provided as “reference position detecting means” for detecting that Signals from the NE sensor 31 and the G sensor 33 are input to the engine ECU 19.
[0047]
Although not shown, the M / G ECU 17 is operated with an accelerator opening sensor for detecting an accelerator pedal opening (accelerator opening) operated by a vehicle driver and a vehicle brake pedal. Signals from various sensors for detecting the driving state of the vehicle, such as a brake sensor for detecting this and a vehicle speed sensor for detecting the traveling speed (vehicle speed) of the vehicle, are also input.
[0048]
In such a hybrid vehicle of the first embodiment, the driving force is transmitted from the output shaft 7 of the M / G 5 using the battery as a power source to the wheels 11R and 11L via the differential gear 9. Since the output shaft from the rotor of M / G5 is connected to the output shaft from the rotor of M / G3 and the output shaft 1a of the engine 1 through the planetary gear unit as described above, the output shaft to the wheels 11R and 11L. Or the deceleration force from the wheels 11R, 11L is shared by the M / G 3, 5 and the engine 1.
[0049]
Therefore, the M / G ECU 17 determines the rotational speed of each M / G 3, 5 based on the state of charge of the battery, the gear ratio of the planetary gear unit, the vehicle running load detected from the accelerator opening sensor and the vehicle speed sensor, and the like. And the generated torque (the output torque when operating as a motor and the regenerative torque when operating as a generator), the field current of each M / G 3, 5 is controlled by inverters 13 and 15, and the engine 1 Are determined so that the fuel consumption and emission of the engine 1 are the best. Here, the target torque “0” and the target rotational speed “0” may be obtained. That is, the engine 1 is stopped. And M / G * ECU17 controls the output of M / G3, 5 so that the determined target torque may be added to the output shaft 1a of the engine 1 as a load.
[0050]
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 the rotational speed of the engine 1 detected based on the signal from the rotation angle sensor 31. The DC motor 25 is driven to control the opening degree of the throttle valve 23 so that it converges to the target rotational speed commanded from the M / G • ECU 17, whereby the output of the engine 1 is controlled by the M / G • ECU 17. To the target output determined by. Further, the engine ECU 19 executes various diagnostics based on the rotation angle signal from the NE sensor 31. Examples of the various diagnosis include a disconnection diagnosis of an air flow meter, a determination diagnosis of whether the oxygen sensor is activated or deteriorated, an abnormality determination diagnosis based on a knock sensor, a disconnection diagnosis of a water temperature sensor, and a misfire detection diagnosis.
[0051]
And by such operation | movement of M / G * ECU17 and engine ECU19, each M / G3,5 and the engine 1 are controlled by various electric power balance patterns.
For example, if the battery is charged more than a predetermined amount and the running load is small, the M / G 5 is operated as a motor to drive the vehicle by the output of the M / G 5 and the output of the engine 1 is set to “0”. The operation of the engine 1 is stopped. In this state, when the traveling load increases, the starter (not shown) forcibly rotates the output shaft 1a of the engine 1 to start the engine 1, and the driving force that is insufficient with the output of the M / G 5 is reduced. Make up with output. Further, when the battery is discharged by a predetermined amount or more and the charging power is reduced, the vehicle is driven through the M / G 5 with the output of the engine 1 and the remaining output of the engine 1 is used for the M / G. Control of charging the battery by G3 may be performed.
[0052]
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. The engine ECU 19 of the present embodiment It is determined whether or not the rotation angle signal from the sensor 31 is an abnormal signal. If it is determined that the rotation angle signal is an abnormal signal, processing based on the rotation angle signal is prohibited.
[0053]
Here, in order to facilitate understanding of the following description, the rotation angle signal detected by the NE sensor 31 and the reference signal detected by the G sensor 33 will be described first.
In the first embodiment, a signal rotor 41 as shown in FIG. 3A is integrally attached to the output shaft 1 a of the engine 1. The signal rotor 41 is coaxially attached to the output shaft 1 a, and a plurality of protrusions 41 a are formed on the outer periphery of the signal rotor 41. The protrusions 41a of the signal rotor 41 are arranged every 360 degrees / 36 = 10 degrees, and have two missing parts (hereinafter referred to as “missing teeth”) 41b. The NE sensor 31 is disposed outside the signal rotor 41 so as to detect the passage of the protrusion 41a accompanying the rotation of the signal rotor 41.
[0054]
FIG. 4 shows a signal waveform output from the NE sensor 31. FIG. 4A shows a signal waveform when the output shaft 1a rotates in the forward direction (direction rotated by the operation of the engine 1). FIG. 4B shows a signal waveform when the output shaft 1a rotates in the reverse direction.
[0055]
Here, the waveform corresponding to one protrusion 41a is a waveform having a shape in which positive and negative are reversed at the time point closest to the NE sensor 31 (hereinafter referred to as “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 has a repetitive pattern of the protrusion corresponding waveform. A portion (hereinafter referred to as “missing tooth portion”) in which the interval between the protrusion-corresponding waveforms is wide is generated corresponding to the missing tooth 41b (see FIG. 4).
[0056]
FIG. 3B illustrates the correspondence between the position of the protrusion 41a and the signal waveform output from the NE sensor 31. The position of the protrusion 41a is represented by three symbols α, β, and γ. I will show you. That is, when rotating in the above-described forward direction (the direction indicated by the symbol A), the protrusion 41a crosses the front of the NE sensor 31 in the order of the position α → β → γ, while the reverse direction (the direction indicated by the symbol B). ), The projection 41a crosses the front of the NE sensor 31 in the order of the positions γ → β → α. Note that the position α and the position γ are symmetric with respect to the position β.
The correspondence between these positions α, β, γ and 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 the signal rotor 41 rotates forward. In this case, the signal that is “0” at the position α first increases slowly to the plus side, rapidly reverses to the minus side before and after the position β, and then slowly increases to become “0” at the position γ. To do. FIG. 4B shows a case where the projection 41a passes through the position γ → β → α in this order, and the signal rotor 41 rotates in the reverse direction. In this case, a signal that is “0” at the position γ first decreases slowly to the minus side, rapidly reverses to the plus side before and after the position β, and slowly decreases to become “0” again at the position α. .
[0057]
The reference signal detected by the G sensor 33 has a similar waveform. However, protrusions are provided at three reference positions on the outer periphery of a signal rotor (not shown) attached to the output shaft 1 a of the engine 1. Therefore, three projection-corresponding waveforms corresponding to one projection shown in FIG. 4 are output during the period in which the output shaft 1a rotates 360 degrees.
[0058]
Next, a signal abnormality determination process executed by the engine ECU 19 will be described based on the flowchart of FIG. This signal abnormality determination process is repeatedly executed by the engine ECU 19 at predetermined time intervals.
First, in the first step S100, the rotational speed E (ne) of the engine 1 is calculated based on the rotational angle signal from the NE sensor 31. The rotation speed E (ne) is calculated from the measurement result of the pulse time interval of the rotation angle signal during the period in which the crankshaft rotates 360 degrees.
[0059]
In subsequent S110, the rotational speed E (g) of the engine 1 is calculated based on the reference signal from the G sensor 33. Similar 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 in which the crankshaft rotates 360 degrees.
In subsequent S120, the rotational speed E (g) calculated in S110 is corrected to obtain E ′ (g). As described above, the G sensor 33 only detects three protrusions while the crankshaft rotates 360 degrees. Therefore, the rotation speed E (g) calculated based on the reference signal has a larger error than the rotation speed E (ne) calculated based on the rotation angle signal. Therefore, here, E (g) is corrected using the advance / retard angle control amount of the reference signal used for VVT (Variable Valve Timing) control, and E ′ (g) is calculated. Thereafter, the process proceeds to S130.
[0060]
In S130, it is determined whether or not the rotational speed E ′ (g) is “0”. If E ′ (g) ≠ 0 (S130: YES), that is, if the reference signal is output, the process proceeds to S140. On the other hand, if E ′ (g) = 0 (S130: NO), that is, if the reference signal is not output, the process proceeds to S190.
[0061]
In S140 that is shifted to when the reference signal is output, it is determined whether or not the rotational speed E (ne) is “0”. If E (ne) ≠ 0 (S140: YES), that is, if a rotation angle signal is output, the process proceeds to S150. On the other hand, if E (ne) = 0 (S140: NO), that is, if no rotation angle signal is output, the rotation angle signal system abnormality flag X (ne) is set to “1 (abnormal)” in S180. Then, this signal abnormality determination process is terminated. This is because the rotation angle signal is not output despite the presence of the reference signal, which is considered to be a failure or disconnection of the NE sensor 31 or the like.
[0062]
In S150, it is determined whether or not the difference between the rotational speed E (ne) and the rotational speed E ′ (g) is smaller than a predetermined value δ. If | E (ne) −E ′ (g) | <δ (S150: YES), that is, if both signals are output at an appropriate timing, the process proceeds to S160. On the other hand, when | E (ne) −E ′ (g) | ≧ δ (S150: NO), the process proceeds to S170. When | E (ne) −E ′ (g) | ≧ δ, both the rotation angle signal and the reference signal are output, but both signals are not output at an appropriate timing.
[0063]
In S160, “0 (normal)” is substituted for the rotation angle signal abnormality flag XK (ne), “0 (normal)” is substituted for the reference signal system abnormality flag X (g), and then this signal abnormality determination is performed. The process ends.
In S170, “1 (abnormal)” is substituted into the rotation angle signal abnormality flag XK (ne), that is, the rotation angle signal is determined to be abnormal, and then this signal abnormality determination process is terminated.
[0064]
If the determination in S130 is negative, that is, if it is determined that the reference signal is not output, in S190, “1” is substituted into the rotation angle signal abnormality flag XK (ne), and then this signal The abnormality determination process ends. In this case, the rotation angle signal may not be output, but if there is no reference signal, it is determined that the rotation angle signal is abnormal.
[0065]
Next, a prohibition process executed by the engine ECU 19 will be described following the signal abnormality determination process described above based on the flowchart of FIG. This prohibition process is based on the result of the signal abnormality determination process described above.
First, in step S300, it is determined whether at least one of the rotation angle signal system abnormality flag X (ne) or the rotation angle signal abnormality flag XK (ne) is “1”. If at least one is “1” (S300: YES), the process based on the rotation angle signal is prohibited in S310, and then the prohibition process is terminated. 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 is terminated. Here, the processing based on the rotation angle signal may be, for example, diagnosis processing performed on condition that the rotation angle signal is generated, for example, disconnection diagnosis of the G sensor 33 or the like. Further, a diagnosis executed based on the rotation speed of the output shaft 1a of the engine 1 calculated based on the rotation angle signal (hereinafter referred to as “engine rotation speed”) can be considered. Further, an interrupt process using a predetermined signal generated based on the rotation angle signal can be considered.
[0066]
Next, the effect exhibited by the engine ECU 19 of the first embodiment will be described.
In the engine ECU 19 of the first embodiment, when the reference signal is not output (S130: NO in FIG. 2), the rotation angle signal is determined to be abnormal, and the rotation angle signal abnormality flag XK (ne) is set to “1”. (S190 in FIG. 2). Thus, in the first embodiment, attention is paid to 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, when the output shaft 1a of the engine 1 is rotated in a forward direction and a reverse direction alternately at a minute angle and the rotation angle signal is output, the output shaft 1a is 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 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 there are three pulses of the reference signal. 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 minute angle. Therefore, processing based on this rotation angle signal is prohibited. As a result, processing such as diagnosis based on an abnormal rotation angle signal generated by alternately rotating the output shaft 1a of the engine 1 in the forward direction and the reverse direction at a minute angle is prohibited, and erroneous diagnosis is performed. Inconvenience can be avoided.
[0067]
Even when the rotation angle signal is output together with the reference signal (S130: YES, S140: YES in FIG. 2), the engine speed E (ne) calculated based on the rotation angle signal and the reference It is determined whether or not the difference from the engine speed E ′ (g) calculated based on the signal is within a predetermined range (S150 in FIG. 2). Is abnormal (S170 in FIG. 2), and the processing based on the rotation angle signal is prohibited (S310 in FIG. 5).
[0068]
In this way, when the reference signal is accidentally output together with the rotation angle signal generated by the output shaft 1a of the engine 1 rotating alternately in the forward direction and the reverse direction at a minute angle, When the output timing of the rotation angle signal is abnormal due to poor contact such as in the angle signal system, the abnormality of the output rotation angle signal can be determined. As a result, processing such as diagnosis based on such a rotation angle signal can be prohibited, and inconveniences associated with processing execution can be reliably avoided.
[0069]
Furthermore, when only the reference signal is output and the rotation angle signal is not output (S130: YES, S140: NO in FIG. 2), it is determined that the rotation angle signal system including the NE sensor 31 is abnormal. 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 processing based on the rotation angle signal is not executed. However, for example, the rotation angle signal may be output again due to a contact failure or the like. . In this case, it is not known when the rotation angle signal is not output, and the reliability of the rotation angle signal is low. Accordingly, in this case as well, processing based on the rotation angle signal is prohibited (S310 in FIG. 5). This is advantageous in that the 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 described above in signal abnormality determination processing executed by the engine ECU 19.
[0070]
In the first embodiment, as described with reference to the flowchart of FIG. 2, it is determined by determining 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, in the signal abnormality determination process of the second embodiment, the abnormality of the rotation angle signal is determined 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 the difference will be described below.
[0071]
First, the signal abnormality determination process 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. If it is determined that there is a rotation angle signal (S600: YES), the process proceeds to S610. On the other hand, when it is determined that there is no rotation angle signal (S600: NO), the process proceeds to S760.
[0072]
In S610, which is shifted to 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 is present (S610: YES), the process proceeds to S620. On the other hand, when it is determined that the missing tooth portion does not exist (S610: NO), the process proceeds to S690 in FIG.
[0073]
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. When it is determined by the first determination circuit that the output shaft 1a of the engine 1 is rotating forward, the REVD signal is at a high level, and when it is determined that it is rotating in the reverse direction, the REVD signal is at a low level. If it is determined that the vehicle is rotating forward (S620: YES), “0” is substituted for the rotation angle signal abnormality flag XK (ne) and “0” is substituted for the reverse rotation flag rev in S630. Then, the process proceeds to S650. On the other hand, if it is determined that the vehicle is rotating in the reverse direction (S620: NO), in S640, “1” is substituted for the rotation angle signal abnormality flag XK (ne), and “1” is substituted for the reverse rotation flag rev. Then, the process proceeds to S650.
[0074]
In S690 of FIG. 7 which shifts when it is determined in S610 that the missing tooth portion does not exist, it is determined whether or not “1” is set in the reverse rotation flag rev. This determination is to determine whether or not the output shaft 1a of the engine 1 is rotating in the reverse direction. If rev = 1 (S690: YES), that is, if the output shaft 1a is rotating in reverse, the process proceeds to S700. On the other hand, when rev = 0 (S690: NO), that is, when the output shaft 1a is rotating forward, the process proceeds to S730.
[0075]
In S700 and S730, it is determined whether or not the rotation direction of the output shaft 1a of the engine 1 is reversed. This determination is performed based on a REVD signal that is an output signal from a second determination circuit described later.
If it is determined in S700 that is shifted when the output shaft 1a of the engine 1 is rotating in the reverse direction (S700: YES), that is, if it is forward rotation, the process is reversed in S710. “0” is substituted into the rotation flag rev, and then the process proceeds to S650 in FIG. On the other hand, when it is determined that the rotation direction is not reversed (S700: NO), that is, when the reverse rotation is continued, “1” is substituted into the rotation angle signal abnormality flag XK (ne) in S720, “1” is substituted into the reverse rotation flag rev, and the process proceeds to S650 in FIG.
[0076]
If it is determined in S730 that the output shaft 1a is rotating in the forward direction that the rotation direction has been reversed (S730: YES), that is, if the rotation is reverse, the rotation angle signal is abnormal in S750. “1” is assigned to the flag XK (ne), “1” is assigned to the reverse rotation flag rev, and then the process proceeds to S650 in FIG. On the other hand, when it is determined that there is no reversal of the rotation direction (S730: NO), that is, when the normal rotation is continued, “0” is substituted for the reverse rotation flag rev in S740, and thereafter, FIG. The process proceeds to S650.
[0077]
As described above, the process proceeds to S650 in FIG. 6 from any one of S630, 640, and S710, 720, 740, and 750 in FIG.
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. If XK (ne) = 0 (S650: YES), the process proceeds to S660. On the other hand, if XK (ne) = 1 (S650: NO), the signal abnormality determination process is terminated.
[0078]
In S660, which is shifted to 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. If it is determined that there is a reference signal (S660: YES), “0” is substituted for the reference signal system abnormality flag X (g) in S670, and then this signal abnormality determination process is terminated. On the other hand, if it is determined that there is no reference signal (S660: NO), the reference signal is not output even though the output rotation angle signal is normal. It is determined that the system is abnormal, and “1” is substituted into the reference signal system abnormality flag X (g) in S680, and then this signal abnormality determination process is terminated.
[0079]
Now, in S760, which is shifted when the negative determination is made in S600 described above, that is, when it is determined that there is no rotation angle signal, “1” is substituted into the rotation angle signal abnormality flag XK (ne).
In subsequent S770, it is determined whether the rotation angle signal system abnormality flag X (ne) is "1" or there is a reference signal. Here, when X (ne) = 1 or there is a reference signal (S770: YES), that is, after it is determined that the rotation angle signal system is once abnormal, or when there is no rotation angle signal, there is a reference signal. Is determined that the rotation angle signal system including the NE sensor 31 is abnormal, and “1” is substituted into the rotation angle signal system abnormality flag X (ne) in S780, and then this signal abnormality determination process is terminated. To do. On the other hand, if X (ne) = 0 and there is no reference signal (S770: NO), “0” is substituted into the rotation angle signal system abnormality flag X (ne) in S790, and this signal abnormality determination process is performed. finish. If neither the rotation angle signal nor the reference signal is output, the engine 1 may be stopped normally. On the other hand, the NE sensor 31 and the G sensor 33 may both be out of order. It is done. Therefore, if 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”.
[0080]
Next, the first determination circuit that enables the determination in S620 described above will be described.
FIG. 8 is a circuit diagram showing a first determination circuit of the second embodiment, and FIG. 9 is a time chart showing signal waveforms of a predetermined portion of this circuit.
[0081]
As shown in FIG. 8, the determination circuit is input via the LPF (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 the LPF 51. A missing tooth part judging circuit 54 for judging a missing tooth part in the rotation angle signal, latches 55 and 56 operated by outputs of the comparators 52 and 53 and the missing tooth part judging circuit 54, and outputs of the latches 55 and 56 An operating set / reset latch (hereinafter referred to as “SR latch”) 57 is provided. In order to distinguish the two comparators 52 and 53, they are described as an A comparator 52 and a B comparator 53. Further, the latch 55 connected to the A comparator 52 is described as an A latch 55, and the latch 56 connected to the B comparator 53 is described as a B latch 56 to be distinguished.
[0082]
The output terminal of the NE sensor 31 is connected to the input terminal of the LPF 51, and the output terminal of the LPF 51 is a non-inverting input terminal (+) of the A comparator 52, an inverting input terminal (−) of the B comparator 53, and a missing tooth determination circuit 54. It is connected to the. The potential of the inverting input terminal (−) of the A comparator 52 is set to the comparison voltage Vth1 slightly higher than “0”. 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 the power supply via the pull-up resistor 58 and is also connected to the input terminal (D) of the A latch 55. Further, the output terminal of the B comparator 53 is connected to the power supply via the pull-up resistor 58 and is also connected 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. 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.
[0083]
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 “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.
[0084]
In the latches 55 and 56 of A and B, when the signal level of the reset terminal (R) is low (hereinafter referred to as “L”), the signal level of the input terminal (D) is changed from L. When it changes to H, the signal level of the output terminal (Q) is held at H, and when the signal level of the reset terminal (R) becomes H, the signal level of the output terminal (Q) is held at L.
[0085]
The SR latch 57 holds the signal level of the output terminal (Q) at H when the signal level at the set terminal (S) becomes H, and the output terminal (Q) when the signal level at the reset terminal (R) becomes H. The signal level is kept at L.
The missing tooth portion determination circuit 54 detects the time interval between the two protrusion-corresponding waveforms that are continuously output from the rotation angle signal, and when the time interval becomes 2.5 times or more the time interval detected immediately before, the predetermined period Only the signal level is held at H, and the others are held at L.
[0086]
Next, the operation of the first determination circuit shown in FIG. 8 will be described based on the time chart of FIG.
9A and 9B show the rotation angle signal output from the LPF 51, the signal level (ne +) of the output terminal of the A comparator 52, the signal level (ne−) of the output terminal of the B comparator 53, and the missing tooth portion. The signal level of the output terminal of the determination circuit 54 and the signal level of the output terminal (Q) of the SR latch 57, that is, the level of the REVD signal are described in association with each other. FIG. 9A shows the case where the output shaft 1a of the engine 1 is rotating forward, while FIG. 9B shows the case where the output shaft 1a of the engine 1 is rotating backward.
[0087]
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. When H becomes lower than 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 becomes H level. Conversely, when the level of the rotation angle signal from the LPF 51 falls below 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 B comparator 53 changes from L to H. 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 minus direction, the output terminal of the B comparator 53 becomes H level.
[0088]
When the missing tooth portion determination circuit 54 determines the missing tooth portion in the rotation angle signal, the signal level of the output terminal is set to H level for a predetermined period (see FIG. 9). The output terminal of the missing tooth determination circuit 54 is input to the reset terminals (R) of the A and B latches 55 and 56 via the inverter 59. Therefore, the reset terminals (R) of the A and B latches 55 and 56 are at the L level during a predetermined period in which the output signal from the missing tooth determination circuit 54 is at the H level immediately after it is determined that there is the missing tooth portion. In other periods, the reset terminal (R) is at the H level. Therefore, the A and B latches 55 and 56 are reset when the signal level of the output terminals of the corresponding A and B comparators 52 and 53 changes from L to H in a predetermined period immediately after the missing tooth portion is determined. During the period until (R) becomes H, the signal level of the output terminal (Q) is held at H. 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 is 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 is L level.
[0089]
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 positive direction, that is, if the output shaft 1a of the engine 1 is rotating forward, the REVD signal becomes H level. If it appears in the minus direction, that is, if the output shaft 1a of the engine 1 is rotating in the reverse direction, the REVD signal is L level.
[0090]
Therefore, in S620 during the signal abnormality determination process described above, whether or not the output shaft 1a of the engine 1 is rotating forward can be determined based on whether or not the REVD signal is at the H level.
Next, the second determination circuit that enables determination in S700 and S730 (see FIG. 7) during the signal abnormality determination process described above will be described.
[0091]
Unlike the first determination circuit, the second determination circuit determines the rotation direction 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 waveform shape of the rotation angle signal. In order to facilitate understanding of the circuit described below, a conceptual description of this determination method is first given using FIG.
[0092]
This method focuses on one of the waveforms appearing on the plus side or minus side of the rotation angle signal. In FIG. 4A, if attention is paid to one of the waveforms appearing on the plus side, it can be seen that the signal level slowly increases and decreases instantaneously. That is, as shown in FIG. 4 (a), when the output shaft 1a of the engine 1 is rotating forward, the signal level increase period is T1 and the decrease period is T2 for one of the waveforms appearing on the plus side. Then, T1> T2. Similarly, when looking at FIG. 4B, that is, when the output shaft 1a of the engine 1 is rotating in the reverse direction, T1 <T2. Even when attention is paid to one of the waveforms appearing on the minus side, the signal level increase period and the decrease period are reversed in the forward rotation and the reverse rotation.
[0093]
Therefore, paying attention to one waveform appearing on the plus side or the minus side and determining the magnitude of the signal level increase period and decrease period, the rotation direction of the output shaft 1a of the engine 1 can be determined.
A second determination circuit for performing such determination will be described below.
[0094]
10 and 11 are circuit diagrams showing the second determination circuit, and FIG. 12 is a time chart showing signal waveforms of a predetermined portion of this circuit.
As shown in FIGS. 10 and 11, the second determination circuit includes an LPF (low-pass filter) 61, two comparators 62 and 63 for determining the signal level of the rotation angle signal input via the LPF 61, and the LPF 51. A differential circuit 64 that outputs a differential waveform signal of the waveform of the rotation angle signal input via the differential circuit 64, and two comparators 65 and 66 that determine the signal level of the differential waveform signal from the differential circuit 64. Hereinafter, the four comparators 62, 63, 65, and 66 will be described as an A comparator 62, a B comparator 63, a C comparator 65, and a D comparator 66, respectively.
[0095]
The second determination circuit also includes an oscillator 75 that outputs a pulse signal having a predetermined clock frequency, four counters 81, 82, 83, and 84, and a comparison circuit that compares output results from the counters 81, 82, 83, and 84. 85 and 86 and an SR latch 87. Hereinafter, the counters 81 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. Distinguish each.
[0096]
The output terminals of the comparators 62, 63, 65, 66 of A to D described above are connected to a power source 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. 8. The A comparator 62 is a waveform of the rotation angle signal output from the LPF 61. When it appears on the plus side, it becomes H level. Further, the B comparator 63 becomes H level when the waveform of the rotation angle signal output from the LPF 61 appears on the minus side.
[0097]
The differentiation circuit 64 outputs a differential waveform signal obtained by differentiating the signal waveform of the rotation angle signal. The differentiation circuit 64 is a well-known circuit constituted by 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 differentiation circuit 64. The potential of the inverting input terminal (−) of the C comparator 65 is set to a comparison voltage Vth3 that is slightly larger than “0”. The potential of the non-inverting input terminal (+) of the D comparator 66 is set to the comparison voltage Vth4 that is slightly smaller than “0”.
[0098]
Therefore, the signal level at 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 at the output terminal of the D comparator 66 is changed from L to H when the signal level output from the differentiating circuit 64 is lower than the comparison voltage Vth4, and from H to L when the signal level is higher than 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, and when the differentiated waveform signal output from the differentiating circuit 64 appears on the minus side, This is because the signal level of the output terminal of the D comparator 66 becomes H level.
[0099]
Further, as shown in FIG. 11, the output terminals of the A to D comparators 62, 63, 65, 66 are connected to the two input four AND circuits 76, 77, 78, 79 in a predetermined combination. These four AND circuits 76 to 79 are described as an A AND circuit 76, a B AND circuit 77, a C AND circuit 78, and a D AND circuit 79, and are distinguished below.
[0100]
The signal (ne +) from the A comparator 62 and the signal (ne ′ +) from the C comparator 65 are input to the A AND circuit 76, and the signal (ne +) from the A comparator 62 and the signal (ne′−) from the D comparator 66. ) Is input to the B AND circuit 77. Further, the signal (ne−) from the B comparator 63 and the signal (ne′−) from the D comparator 66 are sent to the C AND circuit 77, the signal (ne−) from the B comparator 63 and the signal (ne from the C comparator 65). '+) Is input to the D AND circuit 79.
[0101]
Output terminals of the AD circuits 76 to 79 are connected to permission terminals of the AD counters 81 to 84, respectively.
The output terminal of the oscillator 75 described above is connected to the clock terminals (CLK) of the AD counters 81 to 84. The reset terminals (RST) of the A and B counters 81 and 82 are 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 B comparison circuit. It is connected to 86 completion terminals. 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 the second input terminal (input b) of the A comparison circuit 85. It is connected to the.
[0102]
Further, 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. Has been. Two output terminals (true and false) of the A and B comparison circuits 85 and 86 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. The input terminal of the A OR circuit 88 is connected to the output terminal (true) of the A comparison circuit 85 and the output terminal (true) of the B comparison circuit 86. The input terminal of the B OR circuit 89 is connected to the output terminal (false) of the A comparison circuit 85 and the output terminal (false) of the B comparison circuit 86.
[0103]
The output terminal of the A OR circuit 88 is connected to the set terminal (S) of the SR latch 87. The output terminal of the B OR circuit 89 is connected to the reset terminal (R). 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.
[0104]
Here, the operations of the A to D counters 81 to 84 and the A and B comparison circuits 85 and 86 will be described.
Each of the counters 81 to 84 of A to D performs counting based on the pulse signal from the oscillator 75 input to the clock terminal (CLK) while 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. When the signal level of the reset terminal (RST) becomes H level, the counter value is reset.
[0105]
The A comparison circuit 85 starts from the A counter 81 that is input to the first input terminal (input a) when the signal level from the A comparator 62 that is input to the comparison timing terminal (comparison) changes from H to L. Is compared with the count value b from the B counter 82 inputted to the second input terminal (input b). Here, when the count value a input to the first input terminal (input a) is larger than the count value b input to the second input terminal (input B), the output terminal (true ) From the L level to the H level, and the signal level at the completion terminal is changed from the L level to the H level. On the other hand, when the count value a input to the first input terminal (input a) is less than or equal to the count value b input to the second input terminal (input B), the output terminal (false) The signal level changes from L level to H level, and the signal level at the completion terminal changes from L level to H level.
[0106]
Similarly to the A comparison circuit 85, the B comparison circuit 86 also has a first input terminal (input c) when the signal level from the B comparator 63 input to the comparison timing terminal (comparison) changes from H to L. Is compared with the count value c from the C counter 83 and the count value d from the D counter 84 that is input to the second input terminal (input d). If c <d, the signal level at the output terminal (true) changes from L level to H level, and the signal level at 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.
[0107]
The operation of the SR latch 87 is the same as that of the SR latch 57 in the first determination circuit described above with reference to 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. The waveform signal (ne ′), the count value output from the counters 81 to 84 of A to D, and the REVD signal of the output terminal (Q) of the SR latch 87 are shown in correspondence with each other.
[0108]
Here, the output signal (ne +) from the A comparator 62 and the output signal (ne−) from the B comparator 63 based on the rotation angle signal are the same as those in the determination circuit described above. That is, when the waveform of the rotation angle signal appears on the plus side, the ne + signal becomes H level, and when it appears on the minus side, the ne− signal becomes H level. The comparison voltages of the A comparator 62 and the B comparator 63 are set to the comparison voltage Vth1 slightly larger than “0” and Vth2 slightly smaller than “0”, respectively, as described above. The comparison voltage is indicated as “0” in order to avoid complications.
[0109]
The relationship between the differential waveform signal (ne ′) output from the differentiation circuit 64 and the C and D comparators 65 and 66 is the same as the relationship between the rotation angle signal and the A and B comparators 62 and 63 described above. 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 at the output terminal of the D comparator 66 becomes H level. In other words, the output terminal of the C comparator 65 is H level when the signal level of the rotation angle signal is increasing, and the output terminal of the D comparator 66 is H when the signal level of the rotation angle signal is decreasing. Become a level.
[0110]
Therefore, the output of the A-and-circuit 76 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 increasing. The output of the B AND circuit 77 becomes H level when the waveform of the rotation angle signal (2) 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 minus side and the signal level of the rotation angle signal is decreasing. The output of the D AND circuit 79 becomes 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.
[0111]
The corresponding A to D counters 81 to 84 count up during the period in which the outputs of the A and D AND circuits 76 to 79 are at the H level. Accordingly, the count values a to d of the A to D counters 81 to 84 are the time during which any of the above conditions (1) to (4) is satisfied.
[0112]
In FIG. 12, the period [t1, t2] is a period that satisfies the condition (1), and the A counter 81 counts up. 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. The period [t2, t3] is a period that satisfies the condition (2), and the B counter 82 counts up. Since the signal ne + changes from the H level to the L level at time t3, the A comparison circuit 85 compares the count value a of the A counter 81 with the count value b of the B counter 82, and if a> b, the output terminal ( Set true to H level. On the other hand, if a ≦ b, the output terminal (false) is set to H level. In the example of the period [t1, t3] in FIG. 12, since a> b, the output terminal (true) is at the H level. As a result, the set terminal (S) of the SR latch becomes H level, so that the output terminal (Q) of the SR latch 87, that is, the REVD signal becomes H level at time t3 as shown in FIG. At time t3, since the completion terminal of the A comparison circuit 85 becomes H level and the reset terminals (RST) of the A and B counters 81 and 82 become H level, the count values of the A and B counters 81 and 82 are counted. a and b are reset to “0”.
[0113]
The period [t3, t4] is a period that satisfies the above condition (3), the C counter 83, and the period [t4, t5] is a period that satisfies the condition (4). Counts up. Since the signal ne− is inverted from the H level to the L level at time t5, the B comparison circuit 86 compares the count value c of the C counter 83 with the count value d of the D counter 84 at time t5. In this case, since c <d, the signal level of the output terminal (true) becomes H level. As a result, the set terminal (S) of the SR latch 87 becomes H level, so that the output terminal (Q) of the SR latch 87 is held at H level. That is, the REVD signal remains at the H level.
[0114]
After time t5, the rotational direction of the output shaft 1a of the engine 1 is reversed at the time indicated by the symbol α. Accordingly, 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 reset terminal (R) of the SR latch 87 becomes H level, and the output terminal (Q) of the SR latch 87 is inverted to L level. That is, the signal level of the REVD signal is inverted to the L level. That is, it is determined that the rotation direction of the output shaft 1a of the engine 1 is reversed at time t7.
[0115]
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 chipped portion, and if the output shaft 1a is normal rotation, the REVD The signal is set to “1”, and if the rotation is reverse, the REVD signal is reset to “0”. Therefore, in the determination processing of S700 and S730 in FIG. 7 described above, if it is determined whether or not the REVD signal that is the output signal from the second determination circuit has been inverted, the rotation direction of the output shaft 1a of the engine 1 is determined. It can be determined whether or not it is reversed.
[0116]
Next, the effect exhibited by the engine ECU 19 of the second embodiment will be described.
In the second embodiment, when it is determined that a 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. Based on the output result of the first determination circuit for determining the rotation direction, the rotation direction of the engine 1 output shaft 1a is determined (S620 in FIG. 6). If it is determined that the missing tooth portion does not exist (S610 in FIG. 6: NO), the output 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. Based on the result, the reversal of the rotation direction of the output shaft 1a of the engine 1 is determined (S700, S730 in FIG. 7). If it is determined that the rotation is reverse, the rotation angle signal is determined to be abnormal (S640 in FIG. 6, S720, S750 in FIG. 7).
[0117]
In that case, similarly to 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 / G 3 and 5, the rotation angle signal generated when the engine 1 rotates in reverse due to the load from the connected M / G 3 and 5 is abnormal. Therefore, it is possible to avoid the inconvenience caused by executing the processing based on the rotation angle signal output in a state where the output shaft 1a of the engine 1 is rotated in the reverse direction.
[0118]
Further, the engine ECU 19 of the second embodiment determines that the missing tooth portion is not present after the reverse rotation of the output shaft 1a of the engine 1 is determined and the rotation angle signal abnormality flag XK (ne) once becomes “1”. The rotation angle signal abnormality flag XK (ne) becomes “0” for the first time when it is determined that it exists (S610 in FIG. 6: YES) and is determined to be forward rotation (S620: YES in FIG. 6). . In other words, once the rotation angle signal abnormality flag XK (ne) becomes “1”, even when it is determined that the rotation direction of the output shaft 1a of the engine 1 is reversed and becomes normal (FIG. 7). S700: YES, S730: NO), the rotation angle signal abnormality flag XK (ne) is not reset to “0” (see S710 and S740 in FIG. 7).
[0119]
This is because, when the rotation of the output shaft 1a of the engine 1 in the forward direction is determined, it is determined whether or not a missing tooth portion is present in the rotation angle signal, whereby the forward rotation and the reverse rotation of a minute angle are performed. A determination is made as to whether it is a temporary positive rotation in the case of alternating occurrence, or a positive rotation by the operation of the engine 1 or a forced positive 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 forward rotation and the reverse rotation of a minute angle are alternately generated on the output shaft 1a of the engine 1, and inconvenience caused by execution of the processing. It can be avoided reliably.
[0120]
Furthermore, in the second embodiment, when the rotation angle signal is normally output (S650 in FIG. 6: YES), the reference signal is not output (S660 in FIG. 6). : NO), 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”. Thereby, it can be determined that the reference signal is not output due to a failure of the G sensor 33, for example.
[0121]
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: YES in FIG. 6), the NE sensor 31 is output. Is determined to be abnormal, and the rotation angle signal system abnormality flag X (ne) is set to “1”. This is because when only the reference signal is output, it is considered that the rotation angle signal output at the predetermined rotation position set at a narrow interval with respect to the reference position is naturally output. As a result, disconnection or the like of the NE sensor 31 can be determined.
[0122]
When it is determined that the rotation angle signal is 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 is abnormal. Even 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) This is because of the same reason as in the first embodiment. That is, processing execution based on a rotation angle signal with low reliability is prohibited.
[0123]
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. In contrast, in the second 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 this. Therefore, it is advantageous in that the rotation angle signal output when the output shaft 1a of the engine 1 is reversely rotated by a load from, for example, M / G 3 and 5 can be determined as an abnormal signal. Further, since the reference signal is not used as a criterion for judging the abnormality, the abnormality of the G sensor 33 that outputs the reference signal can be determined together (S660 to S680 in FIG. 6).
[0124]
The signal abnormality determination process shown in FIGS. 6 and 7 executed by the engine ECU 19 of the second embodiment corresponds to the process as “abnormality determination means”, and the prohibition process shown in FIG. Corresponds to the processing of “ Further, the first and second determination circuits described with reference to FIGS. 8, 10, and 11 correspond 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.
[0125]
Therefore, a third determination circuit will be described with reference to FIGS. 13 and 14 as another determination circuit.
This determination method is also intended to determine the rotation direction based on the shape of the waveform of the rotation angle signal, and is focused on one of the waveforms appearing on the plus side or the minus side of the rotation angle signal. This is the same as the second determination circuit described above. In the second embodiment, the signal level increase period and the decrease period are compared in the waveform appearing on the plus side or the minus side of the rotation angle signal.
[0126]
On the other hand, in the determination method described below, the slopes of waveforms appearing on the plus side or the minus side of the rotation angle signal are compared. First, an outline will be described with reference to FIG.
In FIG. 4A, if attention is paid to one of the waveforms appearing on the plus side, it can be seen that the signal level slowly increases and decreases instantaneously. That is, when the output shaft 1a of the engine 1 is rotating in the forward direction, if attention is paid to one of the waveforms appearing on the plus side, the absolute value of the slope at a predetermined point in the signal level increase period is the predetermined value in the decrease 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 the predetermined time point in the increase period is larger than the absolute value of the slope at the predetermined time point in the decrease period. Therefore, the rotational direction of the output shaft 1a of the engine 1 can be determined by comparing the absolute values of the inclinations at these predetermined times.
[0127]
Hereinafter, a third determination circuit that determines the rotation direction of the output shaft 1a of the engine 1 by such a method will be described. Only parts different from the second determination circuit described in the second embodiment will be described.
The third determination circuit includes two comparators 62 and 63 of LPF 61, A and B and a differentiation circuit 64 in the circuit configuration shown in FIG.
[0128]
Further, as shown in FIG. 13, four data latches 101, 102, 103, 104, two comparison circuits 105, 106, and an SR latch 107 are provided. The four data latches 101, 102, 103, and 104 are described as an A data latch 101, a B data latch 102, a C data latch 103, and a D data latch 104 to be distinguished below. Further, the two comparison circuits 105 and 106 are described as an A comparison circuit 105 and a B comparison circuit 106, and are distinguished below.
[0129]
A signal (ne +) output from the A comparator 62 is input to the latch terminal of the A data latch 101 and the latch terminal of the B 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.
[0130]
The differential waveform signal output from the differentiation circuit 64 is input to the data input terminals (D) of the data latches 101 to 104 of A to D.
The A data latch 101 determines the signal level of the data input terminal (D) at the time when the signal (ne +) from the A comparator 62 is inverted from L level to H level, that is, when ne + rises, to the reset terminal (RST). Until the signal level becomes H level. Here, a signal held at the output terminal is data a.
[0131]
In the B data latch 102, 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 becomes the signal level of the reset terminal (RST). Until the output terminal. Here, a signal held at the output terminal is assumed to be data b.
[0132]
Similarly, the C data latch 103 receives the signal (ne−) from the B comparator 62 when the signal (ne−) from the L comparator inverts from the L level to the H level, and the D data latch 104 receives the signal (ne−) from the B comparator 62. The signal level of the data input terminal (D) at the time of inversion from the H level to the L level is held at the output terminal until the signal level of the reset terminal (RST) becomes the H level. A signal held at the output terminal of the C data latch 103 is data c, and a signal held at the output terminal of the D data latch 104 is data d.
[0133]
The output terminal of the A data latch 101 is connected to the first input terminal (input a) of the A comparison circuit 105, and the output terminal of the B data latch 102 is connected to the second input terminal (input b). ing. The signal (ne +) output from the A comparator 62 is input to the comparison timing terminal of the A comparison circuit 105. The A comparison circuit 105 compares the absolute values of the signal levels input to the first and second input terminals when the signal level of the signal ne + at the comparison timing terminal changes from the H level to the L level. . That is, | a | is compared with | b |. If the absolute value of data a is smaller than the absolute value of data b, the signal level of the output terminal (true) is set to H level. On the other hand, when the absolute value of data a is greater than or equal to the absolute value of data b, the signal level of the output terminal (false) is set to H level.
[0134]
The output terminal of the C data latch 103 is connected to the first input terminal (input c) of the B comparison circuit 106, and the output terminal of the D data latch 104 is connected to the second input terminal (input d). It is connected. A 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 compares the absolute values of the signal levels input to the first and second input terminals when the signal level of the signal ne− at the comparison timing terminal changes from the H level to the L level. To do. That is, | c | and | d | are compared. Here, when the absolute value of data c is larger than the absolute value of data d, the signal level of the output terminal (true) is set to H level. On the other hand, when the absolute value of data c is less than or equal to the absolute value of data d, the signal level of the output terminal (false) is set to H level.
[0135]
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.
[0136]
The output terminal of the A OR circuit 108 is connected to the set terminal (S) of the SR latch 107, and the output terminal of the B OR circuit 109 is connected to the reset terminal (R) of the SR latch 107. When the signal level of the set terminal (S) becomes H level, the SR latch 107 holds the signal level of the output terminal (Q) at H level, and conversely, the signal level of the reset terminal (R) becomes H level. Then, the signal level of the output terminal (Q) is held at the L level.
[0137]
Therefore, when one of the output terminal (true) of the A comparison circuit 105 or 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 held at the H level. Further, when either the output terminal (false) of the A comparison circuit 105 or the output terminal (false) of the B comparison circuit 106 becomes H level, the reset terminal (R) of the SR latch 107 becomes H level. The output terminal (Q) is held at the L level.
[0138]
Now, the operation of the third determination circuit will be described with reference to the time chart of FIG. 14. When the ne + signal is inverted to H level at time t1, the A data latch 101 latches the signal level of ne 'as data a. When the ne + signal is inverted to L level at time t2, the B data latch 102 latches the signal level of ne ′ as data b. Immediately after that, the A comparison circuit 105 compares the absolute value of the data a with the absolute value of the data b. Here, since | a | <| b |, the A comparison circuit 105 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) becomes H level. That is, the REVD signal is held at the H level at time t2.
[0139]
Subsequently, when the ne− signal is inverted to 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 104 latches the signal level of ne ′ as data d. Immediately after that, the B comparison circuit 106 compares the absolute value of the data c with the absolute value of the data d. Here, since | 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, the REVD signal is held at the H level at time t4.
[0140]
Then, after the time t4 (at the time indicated by the symbol α in FIG. 14), the rotation direction of the output shaft 1a of the engine 1 is reversed. Therefore, the data c latched at time t5 and the data d latched at time t6 have a relationship of | 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 signal level of the output terminal (Q) is held at L level. That is, the REVD signal is inverted to L level at time t6.
[0141]
Therefore, in the second embodiment, even if such a third determination circuit is used in place of the second determination circuit, if the inversion of the REVD signal is determined in the determination processing of S700 and S730 in FIG. The reversal of the rotation direction of one output shaft 1a can be determined.
(2) If the second determination circuit in the second embodiment or the third determination circuit described above as (1) is used, it is possible to determine not only the reversal of the output shaft 1a of the engine 1 but also the rotation direction thereof. it can. If only reversal of the output shaft 1a of the engine 1 is determined, the following method can be used. As shown in FIG. 15, when the output shaft 1a of the engine 1 is inverted, the ne + signal or the ne− signal goes to the H level twice in succession, so the ne + signal or the ne− signal continues twice. It is determined whether or not the H level has been reached. In S700 and S730 in FIG. 7 of the second embodiment, since only the reversal of the rotation direction is determined, such a method can be used.
(3) However, in the second determination circuit and the third determination circuit described above, 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 waveform on the plus side or the minus side of the projection corresponding waveform is completely output.
[0142]
However, it is also conceivable that the output shaft 1a of the engine 1 is reversed during the output of the positive or negative waveform. This is like the rotation angle signal shown in FIGS.
Therefore, the above-described technique is supplemented so that it can cope with all cases.
[0143]
For example, as shown in the time chart of FIG. 16, when the rotation angle signal is discontinuous, that is, when the right differential coefficient and the left differential coefficient do not match (time t1 and time t2 in FIG. 16), The rotation direction of the output shaft 1a is reversed. In such a case, since ne ′ does not continuously change, if such an intermittent change in ne ′ is detected, the reversal of the rotation direction of the output shaft 1a of the engine 1 can be determined. The intermittent change of ne ′ appears as a waveform in which ne ′ reverses in a moment as shown in FIG. Therefore, it is only necessary to detect such inversion.
[0144]
Further, as shown in the time chart of FIG. 17, even if the rotation angle signal is continuous, the rotation direction of the output shaft 1a of the engine 1 may be reversed. For example, 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.
[0145]
This may be determined based on the facts as shown below. That is, the waveform of the rotation angle signal corresponding to one protrusion gradually increases from “0” to a predetermined period (hereinafter referred to as “first period”) in the case of forward rotation, and rapidly decreases on the negative side. Through a period (hereinafter referred to as “second period”), the time period slowly increases to “0” in a period substantially similar to the first period (hereinafter referred to as “third period”). Here, in the period obtained by adding the second period and the third period, the differential waveform signal ne ′ becomes “0” only twice. Furthermore, since the second period is a very short period, the period obtained by adding the second period and the third period may be regarded as the same as the first period.
[0146]
Therefore, whether the differential waveform signal ne ′ becomes “0” only twice after the first period is counted and until the same time as the first period elapses after the end of the first period. What is necessary is just to determine. That is, if it is “0” once or three times, it can be determined that it has been reversed. For this determination, it is conceivable to use a zero cross 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.
[0147]
For example, in FIG. 17, the first period [t1, t2] from time t1 to time t2 is measured by the timer A, and the period [t2, t3] in which the time T measured by the timer A elapses from the time t2. During this time, the output from the zero cross determination circuit is counted by the 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 time t3, and the inversion of the output shaft 1a is determined.
[0148]
Similarly, in the period [t4, t5], the counter A is “1”, so it is determined that there is an inversion. In the period [t6, t7], the counter B is “2”, so it is determined that there is no inversion.
(4) In the first and second embodiments described above, after the rotation angle signal is determined to be abnormal by the signal abnormality determination process described above, the prohibition process shown in FIG. Execution of the process is prohibited, and inconveniences associated with the process execution can be surely avoided. However, there is a possibility that the process based on the abnormal rotation angle signal is executed for a short period until the signal abnormality determination process is executed and the rotation angle signal is determined to be abnormal. In this case, in particular, when ignition processing and injection processing for ignition and fuel injection for the engine 1 are executed, and a diagnosis directly connected to ignition and fuel injection is executed during the ignition processing and injection processing, In other words, fuel injection and ignition are performed. If the fuel injection or ignition is performed, for example, when the engine 1 is rotated in the reverse direction, the engine 1 may be damaged.
[0149]
Therefore, it is conceivable that the ignition diagnosis and the fuel injection diagnosis are appropriately prohibited during the ignition process and the injection process. This will be described.
FIG. 18 shows the 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 by the processing prohibition circuit 110 based on the rotation angle signal (ne) and the reference signal (g) input to the engine ECU 19. The rotation angle signal (ne) and the reference signal (g) are input to the ignition IC 113 via the waveform shaping circuit 112. Then, a predetermined signal is calculated by the CPU 114, thereby energizing the igniter. 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 inhibit the ignition diagnosis in the ignition process for at least a short period until the abnormality of the rotation angle signal is determined.
[0150]
Since the ignition process is well known in the art, a brief description thereof will be given here. This ignition process is for a four-cylinder engine.
As shown in FIG. 18, the rotation angle signal and the reference signal are input to the waveform shaping circuit 112 via the LPF 111. 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 a missing tooth portion for two protrusions on the way. A signal obtained by shaping the rotation angle signal (ne) is a ne36 signal (see FIG. 19).
[0151]
In the ignition IC 113, a ne12 signal obtained by dividing the ne36 signal by 3 (see FIG. 19), a missing tooth determination signal (see FIG. 19) that becomes H level when the missing tooth portion of the ne36 signal is determined, and a specific cylinder based on the ne12 signal TDC (Top Dead Center) signal (see FIG. 20), and a G2O signal that is 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 determination signal (see FIG. 20). 20) and output to the CPU 114. The CPU 114 calculates an IGT1I signal and an IGT2I signal based on the ne12 signal, the TDC signal, and the G2O signal, and outputs them to the ignition IC 113. In the ignition IC 113, an IGT1O signal, an IGT2O signal, an IGT3O signal, which are ignition signals for the four cylinders, based on the IGT1I signal, the IGT2I signal, and the distribution signal (distribution # 1, 4 signal, distribution # 2, 3 signal), The IGT4O signal is output to the igniter (see FIG. 22). As a result, the cylinders are ignited in a predetermined order.
[0152]
Thus, 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 can be made using the value of the crank counter based on the TDC signal and the G2O signal. If the predetermined relationship is not satisfied (S810: NO), ignition diagnosis is prohibited (S820). As a result, ignition is not actually performed. On the other hand, when it is in a predetermined relationship (S810: YES), ignition diagnosis is permitted (S830).
[0153]
In this way, 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, it is possible to prevent the worst situation that the engine 1 is broken due to fuel injection or ignition.
[0154]
Although the ignition process has been described here, the fuel injection process is similarly performed on the basis of the TDC signal and the G2O signal. Therefore, the fuel injection diagnosis may be prohibited by the same method.
(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 the engine 1 The rotation direction of the output shaft 1a was determined. Similarly, as a method for determining the missing tooth portion and determining the rotation direction of the output shaft 1a, at least three missing teeth are provided in the signal rotor, and the position of the missing tooth is opposite to the forward rotation of the signal rotor. If they are arranged so as to be asymmetrical with each other, the forward rotation and the reverse rotation can be determined by calculating the coefficient between the missing teeth. For example, as shown in FIG.
[0155]
Similarly, protrusions may be provided in at least three locations of the signal rotor, and the size of the protrusions themselves may be asymmetrical when the signal rotor rotates in the reverse direction. Further, the interval between the protrusions may be asymmetric with the rotation of the signal rotor in the reverse direction and the rotation in the reverse direction.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a hybrid vehicle according to first and second embodiments.
FIG. 2 is a flowchart showing signal abnormality determination processing executed by the engine ECU of the first embodiment.
3A is an explanatory diagram showing a signal rotor and an NE sensor, and FIG. 3B is an explanatory diagram showing a correspondence between the protrusions 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 showing a prohibition process executed by the engine ECU of the first and second embodiments.
FIG. 6 is a first half of a flowchart showing signal abnormality determination processing executed by the engine ECU of the second embodiment.
FIG. 7 is a second half of a flowchart showing signal abnormality determination processing executed by the engine ECU of the second embodiment.
FIG. 8 is a circuit diagram showing 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 a signal of a predetermined portion of the second determination circuit.
FIG. 13 is a circuit diagram showing a third determination circuit.
FIG. 14 is a time chart showing a signal of a predetermined portion of the third determination circuit.
FIG. 15 is an explanatory diagram showing a method for determining reversal of an output shaft of an engine.
FIG. 16 is an explanatory diagram showing a method for determining reversal of an output shaft of an engine.
FIG. 17 is an explanatory diagram showing a method for determining reversal of an output shaft of an engine.
FIG. 18 is a block diagram showing a schematic configuration of an ignition system in the engine control apparatus.
FIG. 19 is an explanatory diagram showing signals for ignition processing.
FIG. 20 is an explanatory diagram showing signals for ignition processing.
FIG. 21 is a flowchart showing an ignition process.
FIG. 22 is an explanatory diagram illustrating a method for determining the rotation direction of the output shaft of an engine based on missing teeth.
[Explanation of symbols]
1 ... Engine 1a ... Output shaft
3, 5 ... Motor / generator 7 ... Output shaft
9 ... Differential gear 11R, 11L ... Drive wheel
13, 15 ... Inverter 17 ... Motor / generator control device
19 ... Engine control device 21 ... Intake route
23 ... Throttle valve 25 ... DC motor
31 ... NE sensor 33 ... G sensor
41 ... Signal rotor 41a ... Protrusions
41b ... missing teeth
51, 61, 111 ... low pass filter
52, 53, 62, 63, 65, 66 ... comparators
54 ... Missing tooth determination circuit 55, 56 ... Latch
57, 87, 107 ... set reset latch
58, 69 ... Pull-up resistor 59 ... Negative circuit
64 ... differentiation circuit 75 ... oscillator
76, 77, 78, 79 ... AND circuit 81, 82, 83, 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 IC
114 ... CPU

Claims (9)

  A hybrid vehicle having both a motor used as a driving power source and an internal combustion engine used for driving the driving power source or a generator that generates electric power for rotating the motor. Rotation that is used in a hybrid vehicle that stops operation of the internal combustion engine under conditions, and that detects that the output shaft of the internal combustion engine has reached a predetermined rotational position set in plural for one rotation of the output shaft Detects the rotation angle signal output from the position detection means and that the output shaft of the internal combustion engine has reached the reference position set for one rotation of the output shaft at a wider interval than the interval of the predetermined rotational position. A reference signal output from a reference position detecting means that performs the predetermined processing based on at least the rotation angle signal. And only the rotation angle signal is output and the reference signal is not output, an abnormality determination means for determining that the output rotation angle signal is abnormal, and the rotation angle signal by the abnormality determination means. An information processing apparatus comprising: a process prohibiting unit that prohibits a process based on the rotation angle signal when it is determined that is abnormal.   The information processing apparatus according to claim 1, wherein the abnormality determination unit further outputs at least one signal at an appropriate timing even when the rotation angle signal and the reference signal are output. If not, the information processing apparatus determines that the output rotation angle signal is abnormal.   3. The information processing apparatus according to claim 1, wherein the abnormality determination unit further includes the rotation position detection unit 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 is abnormal.   4. The information processing apparatus according to claim 3, wherein when the abnormality determination unit determines that the signal system including the rotation position detection unit is abnormal, the processing prohibition unit performs processing based on the rotation angle signal thereafter. An information processing apparatus configured to prohibit A hybrid vehicle having both a motor used as a driving power source and an internal combustion engine used for driving the driving power source or a generator that generates electric power for rotating the motor. Used in a hybrid vehicle that stops the operation of the internal combustion engine under conditions, and output from rotational position detection means for detecting 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. Rotation direction determination means for determining a rotation direction of the output shaft of the internal combustion engine in an information processing apparatus that executes a predetermined process based on at least the rotation angle signal. Even when the rotation angle signal is output, the rotation direction determination means determines that the output shaft of the internal combustion engine is rotating in reverse. If it is determined that the output rotation angle signal is abnormal, the abnormality determination means determines that the rotation angle signal is abnormal, and the abnormality determination means determines that the rotation angle signal is abnormal. Processing prohibition means for prohibiting processing based on signals ,
The predetermined rotation position is set so that a missing tooth portion for determining that the output shaft of the internal combustion engine has reached a reference rotation angle appears in the rotation angle signal as the output shaft rotates. And
Furthermore, a missing tooth determining means for determining whether or not the missing tooth portion exists in the rotation angle signal,
The abnormality determining means, 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, An information processing apparatus configured to determine that the rotation angle signal is abnormal until it is determined by the missing tooth determination means that a missing tooth portion is present in the rotation angle signal . The information processing apparatus according to claim 5 , wherein together with the rotation angle signal, the rotation position of the output shaft of the internal combustion engine is wider than the predetermined rotation position with respect to the missing tooth portion with respect to one rotation of the output shaft. In addition, a reference signal output from reference position detection means for detecting that the reference position is set separately is input, and the abnormality determination means is further configured to receive the internal combustion engine by the rotation direction determination means. When it is determined that the output shaft of the engine is rotating forward, and the missing tooth determination means determines that a missing tooth portion exists in the rotation angle signal, the reference position is not output when the reference signal is not output. An information processing apparatus configured to determine that a signal system including a detection unit is abnormal. The information processing apparatus according to claim 6 , wherein the abnormality determination unit further includes a signal system including the rotation position detection unit when the rotation angle signal is not output and only the reference signal is output. An information processing apparatus configured to determine that an error is detected. 8. The information processing apparatus according to claim 7 , wherein when the abnormality determination unit determines that the signal system including the rotation position detection unit is abnormal, the processing prohibition unit performs processing based on the rotation angle signal thereafter. An information processing apparatus configured to prohibit An engine control device configured using the information processing device according to any one of claims 1, 2, 3, 4, 6 , 7 , and 8 , wherein the internal combustion engine is based on the rotation angle signal and the reference signal. The engine is configured to perform an ignition process and a fuel injection process, and in the ignition process and the fuel injection process, when the signal based on the rotation angle signal and the signal based on the reference signal are not in a predetermined relationship, An engine control apparatus comprising: an ignition injection prohibiting means for prohibiting ignition and fuel injection to the internal combustion engine by prohibiting diagnosis relating to ignition and fuel injection to the internal combustion engine.

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