WO2021125119A1

WO2021125119A1 - Internal combustion engine system and misfire detection method

Info

Publication number: WO2021125119A1
Application number: PCT/JP2020/046448
Authority: WO
Inventors: 孝典松井; 萩村　将巳; 勇一土屋; 智也石川
Original assignee: 株式会社ミツバ
Priority date: 2019-12-16
Filing date: 2020-12-14
Publication date: 2021-06-24
Also published as: JP7413000B2; BR112022011571A2; CN114829757A; JP2021095855A

Abstract

The present invention miniaturizes an internal combustion engine. This internal combustion engine system is provided with: an internal combustion engine that has a crankshaft; a rotary motor that applies a rotational force to the crankshaft via a rotor directly connected to the crankshaft under a first condition and generates electricity by receiving the rotational force of the crankshaft under a second condition different from the first condition; a rotor position detection unit that detects the rotational position of the rotor and that outputs rotor position information indicating the rotational position of the rotor; a driving control unit that controls a driving circuit which rotationally drives the rotor of the rotary motor, on the basis of the rotor position information outputted from the rotor position detection unit under the first condition; and a misfire detection unit that detects the occurrence of a misfire in the internal combustion engine on the basis of the changing amount of the rotor rotational position per unit time based on the rotor position information.

Description

Internal combustion engine system and misfire detection method

The present invention relates to an internal combustion engine system and a misfire detection method.

As a technique for detecting a misfire of an internal combustion engine, a technique for detecting a misfire based on a rotational fluctuation of the internal combustion engine is known. In such a technique for detecting a misfire of an internal combustion engine, a ring gear is installed on a crankshaft, and an uneven pattern on the outer circumference of the ring gear is detected to detect rotational fluctuation.

Japanese Unexamined Patent Publication No. 4-370344

However, in the conventional technology as described above, since it is necessary to install a ring gear on the crankshaft, there is a problem that the size of the internal combustion engine becomes large.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal combustion engine system capable of miniaturizing an internal combustion engine and a misfire detection method.

In order to solve the above problem, one aspect of the present invention applies a rotational force to the crankshaft via an internal combustion engine having a crankshaft and a rotor directly connected to the crankshaft under the first condition. Under a second condition different from the first condition, a rotary electric machine that receives the rotational force of the crankshaft to generate power, and a rotor position that detects the rotational position of the rotor and indicates the rotational position of the rotor. A drive that controls a rotor position detection unit that outputs information and a drive circuit that rotationally drives the rotor of the rotary electric machine based on the rotor position information output by the rotor position detection unit under the first condition. An internal combustion engine including a control unit and a misfire detection unit that detects that a misfire of the internal combustion engine has occurred based on the amount of change in the rotation position of the rotor per unit time based on the rotor position information. It is a system.

Further, in one aspect of the present invention, in the internal combustion engine system, in the rotary electric machine, a stator in which a coil is wound and a plurality of magnets are arranged alternately with magnetic poles along the inner peripheral surface, and a plurality of magnets are arranged around the stator. The rotor position detection unit is a plurality of magnetic sensors built in the rotary electric machine, and is arranged to face the rotor and faces the magnets. It may have a plurality of magnetic sensors that detect and output the polarity of.

Further, one aspect of the present invention includes a timer that measures and outputs the time of the interval at which the output pattern output by the magnetic sensor is switched in the internal combustion engine system, and the misfire detection unit outputs the timer. , The misfire of the internal combustion engine may be detected based on the change in the time of the switching interval.

Further, in one aspect of the present invention, in the internal combustion engine system, the misfire detection unit determines that a misfire of the internal combustion engine has occurred when the output value of the timer exceeds a predetermined threshold value. It may be.

Further, one aspect of the present invention includes an output storage unit that stores a plurality of output results immediately output by the timer in the internal combustion engine system, and the misfire detection unit is a plurality of output storage units that are stored by the output storage unit. It may be determined that the misfire of the internal combustion engine has occurred when the output result of the above is generated more than a predetermined number of times that exceeds a predetermined threshold value.

Further, one aspect of the present invention includes an output storage unit that stores a plurality of output results immediately output by the timer in the internal combustion engine system, and the misfire detection unit is a plurality of output storage units that are stored by the output storage unit. When the average value of the output results of the above is equal to or more than a predetermined threshold value, it may be determined that the misfire of the internal combustion engine has occurred.

Further, in one aspect of the present invention, in the internal combustion engine system, the number of slots, which is the number of coils, is 18, the number of magnetic poles, which is the number of magnets, is 12, and the rotary electric machine has. It functions as a three-phase brushless motor, and the plurality of magnetic sensors may detect and output the polarity of the magnet corresponding to the three-phase.

Further, in one aspect of the present invention, a rotational force is applied to the crankshaft via an internal combustion engine having a crankshaft and a rotor directly connected to the crankshaft under the first condition, and the first condition is met. A method for detecting a misfire in an internal combustion engine system including a rotary electric machine that receives a rotational force of a crankshaft to generate power under a second condition different from that of the above, wherein a rotor position detecting unit determines the rotational position of the rotor. A rotor position detection step that detects and outputs rotor position information indicating the rotation position of the rotor, and a drive control unit based on the rotor position information output by the rotor position detection step under the first condition. The drive control step for controlling the drive circuit for rotationally driving the rotor of the rotary electric machine and the misfire detection unit are based on the amount of change in the rotation position of the rotor per unit time based on the rotor position information. It is a misfire detection method including a misfire detection step for detecting that a misfire of an internal combustion engine has occurred.

According to the present invention, the configuration of the internal combustion engine can be simplified and the internal combustion engine can be miniaturized.

It is a block diagram which shows an example of the internal combustion engine system by 1st Embodiment. It is sectional drawing which shows the structural example of the start generator in 1st Embodiment. It is a top view which shows the positional relationship between a magnet and a stator in 1st Embodiment. It is a figure which shows the positional relationship between a magnet and a Hall element in 1st Embodiment. It is a figure which shows an example of the output signal of the Hall element in 1st Embodiment. It is a flowchart which shows an example of the operation of the internal combustion engine system by 1st Embodiment. It is a flowchart which shows an example of the operation of the internal combustion engine system by 2nd Embodiment.

Hereinafter, the internal combustion engine system according to the embodiment of the present invention and the misfire detection method will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing an example of the internal combustion engine system 1 according to the first embodiment.
As shown in FIG. 1, the internal combustion engine system 1 includes an internal combustion engine 2, a crankshaft 3, a starting generator 4, a battery 5, a drive circuit 40, and a control unit 50.

The internal combustion engine 2 is, for example, an engine that drives a two-wheeled vehicle, an automobile, or the like. The internal combustion engine 2 has a crankshaft 3 as a rotation shaft, and applies a rotational force to the crankshaft 3.
The crankshaft 3 is directly connected to a rotor 10 which will be described later.

The starting generator 4 (an example of a rotary electric machine) has both functions of a starting motor of an internal combustion engine 2 and an alternating current generator that generates electricity from the rotation of the internal combustion engine 2. When starting the internal combustion engine 2 (under the first condition), the start generator 4 applies a rotational force to the crankshaft 3 via the rotor 10 directly connected to the crankshaft 3 to start the internal combustion engine 2. .. Further, when the internal combustion engine 2 is operating (the second condition), the starting generator 4 receives the rotational force of the crankshaft 3 to generate electricity. The starting generator 4 is, for example, an outer rotor type three-phase brushless motor type.
Further, the starting generator 4 includes a rotor 10 and a stator 20.

The rotor 10 (an example of a rotor) is directly connected to the crankshaft 3 and is rotatably arranged around the stator 20. Further, the rotor 10 is formed in a bottomed tubular shape, and a plurality of magnets 11 are arranged along the inner peripheral surface with alternating magnetic poles.

The stator 20 is arranged inside the rotor 10 and includes a plurality of coils 21 and a plurality of Hall elements 31.
Here, an arrangement example of each configuration of the rotor 10 and the stator 20 will be described with reference to FIGS. 2 to 4.

FIG. 2 is a cross-sectional view showing a configuration example of the starting generator 4 in the present embodiment.
In the following description, the rotation axis direction of the rotor 10 is simply referred to as the axial direction, the radial direction of the stator 20 orthogonal to the rotation axis direction is simply referred to as the radial direction, and the rotation direction of the rotor 10 is simply referred to as the rotation direction or the circumference. Called the direction.

As shown in FIG. 2, a magnet 11 is arranged inside the rotor 10 directly connected to the crankshaft 3. Further, the stator 20 is arranged inside the rotor 10 so that the coil 21 faces the magnet 11.

A sensor case 22 formed in an arc shape is arranged on the stator 20, and the Hall element 31 is fixed at a position facing the magnet 11 by the sensor case 22.

Further, FIG. 3 is a plan view showing the positional relationship between the magnet 11 and the stator 20 in the present embodiment.
As shown in FIG. 3, the stator 20 includes a stator core 23 formed by laminating electromagnetic steel plates and a coil 21 which is a three-phase winding wound around the stator core 23. The stator core 23 has a main body portion 23a formed in an annular shape, and a plurality of tooth portions 23b protruding radially outward from the outer peripheral surface of the main body portion. Each tooth portion 23b is formed in a substantially T shape in an axial plan view.

Each tooth portion 23b is assigned to each of three phases (U phase, V phase, W phase). Further, the coil 21 is wound around each tooth portion 23b.
As shown in FIG. 3, the starting generator 4 in the present embodiment has 12 poles and 18 slots, and the number of coils 21 and teeth portions 23b is 18. The 18 coils 21 and the teeth portion 23b are assigned in the order of U phase, V phase, W phase, ... In the circumferential direction. In the following description, the U-phase coil 21 is referred to as a U-phase coil 21U, the V-phase coil 21 is referred to as a V-phase coil 21V, and the W-phase coil 21 is referred to as a W-phase coil 21W.

On the inner peripheral surface of the rotor 10, a plurality of magnets 11 in which N poles and S poles are alternately magnetized are arranged at equal intervals in the circumferential direction. That is, on the inner peripheral surface of the rotor 10, N-pole magnets (hereinafter referred to as "N-pole magnets") 11N and S-pole magnets (hereinafter referred to as "S-pole magnets") 11S are alternately arranged in the circumferential direction. They are installed side by side at regular intervals along.

Here, in the N-pole magnet 11N, the entire surface inside the radial direction is magnetized to the N pole, and in the S-pole magnet 11S, the entire surface inside in the radial direction is magnetized to the S pole.
In this embodiment, the number of magnetic poles, which is the number of magnets 11, is 12.

Further, the three Hall elements 31 are arranged by the sensor case 22 so as to face the magnet 11 of the rotor 10 as shown in FIG. The three Hall elements 31 are arranged at intervals of 120 degrees of electrical angle.
FIG. 4 is a diagram showing a positional relationship between the magnet 11 and the Hall element 31 in the present embodiment.

In the present embodiment, the Hall element 31 for the V phase is referred to as the Hall element 31-1, the Hall element 31 for the U phase is referred to as the Hall element 31-2, and the Hall element 31 for the W phase is referred to as the Hall element 31. It is called -3. Further, when an arbitrary Hall element incorporated in the starting generator 4 is shown, it will be described as the Hall element 31.

The Hall element 31 (an example of a magnetic sensor) detects and outputs the polarity of the opposing magnet 11. The Hall element 31 outputs, for example, the polarity of the magnet 11 as a binary signal. The Hall element 31-1 outputs an output signal for detecting the rotation position of the rotor 10 for the V phase, and the Hall element 31-2 outputs an output signal for detecting the rotation position of the rotor 10 for the U phase. Is output. Further, the Hall element 31-3 outputs an output signal for detecting the rotation position of the rotor 10 for the W phase. Details of the output signal of each Hall element 31 will be described later with reference to FIG.

Returning to the description of FIG. 1, the battery 5 is, for example, a lead storage battery or a lithium ion battery, and supplies electric power when the starting generator 4 is driven as a three-phase brushless motor (under the first condition). Further, when the starting generator 4 is operated as a generator (second condition), the battery 5 is charged with a part of the generated electric power.

The drive circuit 40 is, for example, an inverter circuit, which converts a direct current supplied from the battery 5 into an alternating current and sends a drive signal to each of the coils 21 (U-phase coil 21U, V-phase coil 21V, W-phase coil 21W). The rotor 10 is driven to rotate. The drive circuit 40 outputs a drive signal for each phase based on a control signal output by the drive control unit 51 of the control unit 50, which will be described later. In the present embodiment, the starting generator 4 is a three-phase brushless motor, and the drive circuit 40 outputs a 120-degree energization drive signal as a U-phase, V-phase, and W-phase drive signal.
Further, the drive circuit 40 rectifies the AC power generated by the starting generator 4 and charges the battery 5.

The control unit 50 is, for example, a processor including a CPU (Central Processing Unit) and the like, and controls the start generator 4 in an integrated manner. The control unit 50 includes a rotor position determination unit 32, a drive control unit 51, a timer 52, an output storage unit 53, and a misfire determination unit 54.
In the present embodiment, the Hall elements 31 (31-1 to 31-3) and the rotor position determination unit 32 correspond to the rotor position detection unit 30. That is, the rotor position detection unit 30 includes Hall elements 31 (31-1 to 31-3) and a rotor position determination unit 32.

The rotor position detection unit 30 detects the rotation position of the rotor 10 and outputs rotor position information indicating the rotation position of the rotor 10. The rotor position detection unit 30 detects the rotation position of the rotor 10 based on the output signals of the plurality of Hall elements 31 (31-1 to 31-3). Here, the output signals of the Hall elements 31 (31-1 to 31-3) will be described with reference to FIG.

FIG. 5 is a diagram showing an example of an output signal of the Hall element 31 in the present embodiment.
In FIG. 5, the waveform W1 is a U-phase detection signal and shows the output signal of the Hall element 31-1. The waveform W2 is a V-phase detection signal and shows the output signal of the Hall element 31-2. Further, the waveform W3 is a W phase detection signal and indicates an output signal of the Hall element 31-3. The horizontal axis indicates time.

The U-phase detection signal, the V-phase detection signal, and the W-phase detection signal are rectangular wave signals whose phases are 120 degrees (electrical angle 120 degrees), and are control signals of the drive circuit 40 based on the switching timing of each signal. Can be generated.
Further, for example, the interval TR1 between the falling edge of the W phase detection signal at time T1 and the rising edge of the V phase detection signal at time T2 indicates the mechanical angle of the rotor 10 of 10 degrees, and the V phase detection signal at time T2. The interval TR2 between the rise of the rotor 10 and the rise of the W phase detection signal at time T3 indicates the mechanical angle of the rotor 10 of 20 degrees. In this way, the rotation speed of the mechanical angle can be measured by detecting the switching interval of the U-phase detection signal, the V-phase detection signal, and the W-phase detection signal.

Returning to the description of FIG. 1 again, the rotor position determination unit 32 detects the position information of the rotor 10 based on the output signals of the Hall elements 31 (31-1 to 31-3) and indicates the rotation position of the rotor 10. Output rotor position information. When starting the internal combustion engine 2, the rotor position determination unit 32 generates, for example, a timing signal for performing 120-degree energization control as rotor position information based on the output signal of the Hall element 31, and the timing signal. Is output to the drive control unit 51.

Further, the rotor position determination unit 32 is for measuring the time of the interval at which the output pattern output by the Hall element 31 is switched based on the output signal of the Hall element 31, for example, when the internal combustion engine 2 is operating. A control signal for the timer 52 is generated, and the control signal is output to the timer 52.
As described above, the rotor position determination unit 32 performs the above-described processing depending on whether the internal combustion engine 2 is started (first condition) or the internal combustion engine 2 is operating (second condition). Switch and execute. That is, the rotor position determination unit 32 generates different rotor position information depending on whether the internal combustion engine 2 is started (first condition) and the internal combustion engine 2 is operating (second condition). Then, the drive control unit 51 and the timer 52 switch and output.

The drive control unit 51 controls the drive circuit 40 that rotationally drives the rotor 10 of the start generator 4 based on the rotor position information output by the rotor position detection unit 30. The drive control unit 51 uses the timing signal output from the rotor position detection unit 30 as rotor position information, and outputs, for example, a control signal for 120-degree energization control to the drive circuit 40.

In the present embodiment, the timer 52, the output storage unit 53, and the misfire determination unit 54 correspond to the misfire detection unit 60. That is, the misfire detection unit 60 includes a timer 52, an output storage unit 53, and a misfire determination unit 54.

The timer 52 measures the time at which the output pattern output by the Hall element 31 switches, and outputs the time to the misfire determination unit 54. That is, the timer 52 uses the control signal of the timer 52 output from the rotor position detection unit 30 as the rotor position information, and measures the time of the interval at which the output pattern is switched as in the interval TR1 of FIG. 5 described above. The timer 52 outputs the measurement result of the interval at which the output pattern is switched to the misfire determination unit 54.

The misfire determination unit 54 detects that a misfire of the internal combustion engine 2 has occurred based on the amount of change in the rotation position of the rotor 10 per unit time based on the rotor position information output by the rotor position detection unit 30. The misfire determination unit 54 detects that the internal combustion engine 2 has misfired, for example, based on the change in the switching interval time output by the timer 52. Here, the switching interval time, which is the output result of the timer 52, corresponds to the rotation speed of the rotor 10 (that is, the amount of change in the rotation position of the rotor 10 per unit time) or the rotation cycle of the rotor 10. The misfire determination unit 54 determines that a misfire of the internal combustion engine 2 has occurred when the output value (output result) of the timer 52 exceeds a predetermined threshold value.

Further, the misfire determination unit 54 sequentially stores the output result of the timer 52 in the output storage unit 53. The misfire determination unit 54 determines that the internal combustion engine 2 has misfired, for example, when a plurality of output results stored by the output storage unit 53 that exceed a predetermined threshold value occur more than a predetermined number of times. To do.

As described above, the output storage unit 53 stores a plurality of output results immediately output by the timer 52.
When it is determined that the misfire of the internal combustion engine 2 has occurred, the misfire determination unit 54 outputs warning information indicating that the misfire of the internal combustion engine 2 has occurred, and turns on, for example, a warning light.

Next, the operation of the internal combustion engine system 1 according to the present embodiment will be described with reference to the drawings.
FIG. 6 is a flowchart showing an example of the operation of the internal combustion engine system 1 according to the first embodiment.

As shown in FIG. 6, the control unit 50 of the internal combustion engine system 1 first determines whether or not to drive the motor (step S101). That is, the rotor position determination unit 32 of the control unit 50 (rotor position detection unit 30) determines whether or not to drive the start generator 4 as a motor. When the rotor position determination unit 32 drives the start generator 4 as a motor (step S101: YES), the rotor position determination unit 32 advances the process to step S107. Further, when the rotor position determination unit 32 does not drive the start generator 4 as a motor (step S101: NO), the rotor position determination unit 32 proceeds to the process in step S102.

Note that the case where the starting generator 4 is not driven as a motor corresponds to, for example, the case where the internal combustion engine 2 is operating and the starting generator 4 is used as a generator.

In step S102, the rotor position determination unit 32 detects the switching of the output pattern of the Hall element 31. The rotor position determination unit 32 measures the time at which the output pattern output by the Hall element 31 is switched based on the output signals of the three-phase Hall elements 31 (31-1 to 31-3) as shown in FIG. The control signal of the timer 52 is generated.

Next, the rotor position determination unit 32 switches to the timer 52 to measure the time of the interval (step S103). That is, the rotor position determination unit 32 outputs a control signal of the timer 52 for measuring the time of the interval at which the above-mentioned output pattern is switched to the timer 52.

Next, the misfire determination unit 54 of the control unit 50 stores the output result of the timer 52 in the output storage unit 53 (step S104). The misfire determination unit 54 sequentially stores the time of the switching interval, which is the output result output from the timer 52, in the output storage unit 53. As a result, the output storage unit 53 stores a plurality of output results most recently output by the timer 52.

Next, the misfire determination unit 54 determines whether or not the number of times the latest output result of the timer 52 exceeds the predetermined threshold value is equal to or greater than the predetermined number of times (step S105). That is, the misfire determination unit 54 refers to the output result of the timer 52 stored in the output storage unit 53, and determines whether or not any of the latest output results of the timer 52 exceeds a predetermined threshold value. , Count the number of output results that exceed a predetermined threshold. The misfire determination unit 54 determines whether or not the number of output results that exceeds the predetermined threshold value is equal to or greater than the predetermined number of times.

The misfire determination unit 54 advances the process to step S106 when the number of output results exceeding the predetermined threshold value is equal to or greater than the predetermined number of times (step S105: YES). Further, the misfire determination unit 54 returns the process to step S101 when the number of output results that have exceeded the predetermined threshold value is less than the predetermined number of times (step S105: NO).

In step S106, the misfire determination unit 54 determines that the internal combustion engine 2 has misfired. The misfire determination unit 54 outputs warning information indicating that a misfire of the internal combustion engine 2 has occurred, and turns on, for example, a warning light. After the process of step S106, the misfire determination unit 54 returns the process to step S101.

Further, in step S107 (when the start generator 4 is driven as a motor), the rotor position determination unit 32 of the rotor position detection unit 30 detects the rotation position of the rotor 10 based on the output of the Hall element 31. The rotor position determination unit 32 generates, for example, a timing signal for performing 120-degree energization control as rotor position information based on the output signals of the three-phase Hall elements 31 (31-1 to 31-3). , The timing signal is output to the drive control unit 51 of the control unit 50.

Next, the drive control unit 51 controls the drive circuit 40 based on the rotation position of the rotor 10 (step S108). That is, the drive control unit 51 controls the drive circuit 40 so as to perform 120-degree energization control based on the timing signal output by the rotor position detection unit 30. For example, the drive control unit 51 outputs a control signal for driving the inverter circuit of the drive circuit 40 to the drive circuit 40. As a result, the drive circuit 40 outputs three-phase (U-phase, V-phase, and W-phase) drive signals to the start generator 4, and rotates (drives) the drive signals using the start generator 4 as a motor. After the process of step S108, the drive control unit 51 returns the process to step S101.

As described above, the internal combustion engine system 1 according to the present embodiment includes an internal combustion engine 2 having a crankshaft 3, a starting generator 4 (rotary electric machine), a rotor position detection unit 30, a drive control unit 51, and a misfire. It includes a detection unit 60. Under the first condition (for example, when starting the internal combustion engine 2), the starting generator 4 applies a rotational force to the crankshaft 3 via a rotor 10 directly connected to the crankshaft 3. Further, the starting generator 4 receives the rotational force of the crankshaft 3 to generate electricity under a second condition different from the first condition (for example, when the internal combustion engine 2 is operating). The rotor position detection unit 30 detects the rotation position of the rotor 10 and outputs rotor position information indicating the rotation position of the rotor 10. Under the first condition, the drive control unit 51 controls the drive circuit 40 that rotationally drives the rotor 10 of the start generator 4 based on the rotor position information output by the rotor position detection unit 30. The misfire detection unit 60 detects that a misfire of the internal combustion engine 2 has occurred based on the amount of change in the rotation position of the rotor 10 per unit time based on the rotor position information.

As a result, the internal combustion engine system 1 according to the present embodiment performs drive control when the rotor position information detected by the rotor position detection unit 30 is driven by the starting generator 4 as a motor (under the first condition), and the internal combustion engine. It is used for both misfire detection of the internal combustion engine 2 when 2 is operating (second condition). That is, in the internal combustion engine system 1 according to the present embodiment, the rotor position detection unit 30 already provided is also used for detecting a misfire of the internal combustion engine 2. Therefore, the internal combustion engine system 1 according to the present embodiment does not need to install a ring gear on the crankshaft 3 as in the prior art, and can simplify the configuration of the internal combustion engine 2. Therefore, in the internal combustion engine system 1 according to the present embodiment, the configuration of the internal combustion engine 2 can be simplified, and the internal combustion engine 2 can be miniaturized.

Further, in the present embodiment, in the starting generator 4, a stator 20 around which the coil 21 is wound and a plurality of magnets 11 are arranged so as to alternate magnetic poles along the inner peripheral surface, and the magnets 11 are rotatably arranged around the stator 20. It has a rotor 10 installed. The rotor position detection unit 30 is a plurality of Hall elements 31 (magnetic sensors) built in the start generator 4, which are arranged to face the rotor 10 and detect and output the polarities of the magnets 11 facing each other. Has a Hall element 31 of.

As a result, the internal combustion engine system 1 according to the present embodiment needs to be separately provided with a sensor for detecting a misfire of the internal combustion engine 2 by using a plurality of Hall elements 31 (magnetic sensors) built in the starting generator 4. The configuration of the internal combustion engine 2 can be simplified.

Further, the internal combustion engine system 1 according to the present embodiment includes a timer 52 that measures and outputs the time of the interval at which the output pattern output by the Hall element 31 is switched. The misfire detection unit 60 (misfire determination unit 54) detects that a misfire of the internal combustion engine 2 has occurred based on the change in the switching interval time output by the timer 52.
As a result, the internal combustion engine system 1 according to the present embodiment can appropriately detect a misfire of the internal combustion engine 2 with a simple configuration.

Further, in the present embodiment, the misfire detection unit 60 (misfire determination unit 54) determines that the internal combustion engine 2 has misfired when the output value of the timer 52 exceeds a predetermined threshold value.
Here, since the output value of the timer 52 indicates the time at which the output pattern output by the Hall element 31 is switched, if the internal combustion engine 2 misfires, the power from the internal combustion engine 2 cannot be obtained, and the timer It is conceivable that the output value of 52 becomes large. From this, in the present embodiment, the misfire detection unit 60 (misfire determination unit 54) can appropriately detect the misfire of the internal combustion engine 2 by a simple method of determining by a predetermined threshold value.

Further, the internal combustion engine system 1 according to the present embodiment includes an output storage unit 53 that stores a plurality of output results immediately output by the timer 52. The misfire detection unit 60 (misfire determination unit 54) causes the internal combustion engine 2 to misfire when a plurality of output results stored in the output storage unit 53 that exceed a predetermined threshold value occur more than a predetermined number of times. Judge that it has occurred.

For example, when a vehicle equipped with an internal combustion engine 2 travels on a rough road, the output result of the timer 52 may suddenly exceed a predetermined threshold value. According to the above configuration, the internal combustion engine system 1 according to the present embodiment accurately determines that the internal combustion engine 2 has misfired even when the internal combustion engine system 1 suddenly exceeds a predetermined threshold value. Can be done. That is, the internal combustion engine system 1 according to the present embodiment can reduce erroneous detection of misfire of the internal combustion engine 2.

Further, in the present embodiment, the number of slots, which is the number of coils 21, is 18, and the number of magnetic poles, which is the number of magnets 11, is 12. The starting generator 4 functions as a 12-pole 18-slot three-phase brushless motor. The plurality of Hall elements 31 detect and output the polarities of the magnets 11 corresponding to the three phases.

As a result, in the internal combustion engine system 1 according to the present embodiment, the minimum resolution by the rotor position detection unit 30 is a mechanical angle of 10 degrees (see the interval TR1 in FIG. 5), and the misfire detection accuracy of the internal combustion engine 2 can be improved. ..

Further, in the misfire detection method according to the present embodiment, a rotational force is applied to the crankshaft 3 via the internal combustion engine 2 having the crankshaft 3 and the rotor 10 directly connected to the crankshaft 3 under the first condition. , A method for detecting a misfire of an internal combustion engine system 1 including a starting generator 4 that generates power by receiving a rotational force of a crankshaft 3 under a second condition different from the first condition, wherein the rotor position is detected. It includes a step, a drive control step, and a misfire detection step. In the rotor position detection step, the rotor position detection unit 30 detects the rotation position of the rotor 10 and outputs rotor position information indicating the rotation position of the rotor 10. In the drive control step, the drive control unit 51 controls the drive circuit that rotationally drives the rotor 10 of the start generator 4 based on the rotor position information output by the rotor position detection step under the first condition. In the misfire detection step, the misfire detection unit 60 (misfire determination unit 54) detects that the internal combustion engine 2 has misfired based on the amount of change in the rotation position of the rotor 10 per unit time based on the rotor position information. ..

As a result, the misfire detection method according to the present embodiment has the same effect as the internal combustion engine system 1 according to the above-described embodiment, the configuration of the internal combustion engine 2 can be simplified, and the internal combustion engine 2 can be miniaturized. Can be done.

[Second Embodiment]
Next, the internal combustion engine system 1 according to the second embodiment will be described with reference to the drawings.
In the present embodiment, a modified example in the detection of the misfire of the internal combustion engine 2 by the misfire detection unit 60 (misfire determination unit 54) will be described.

Since the basic configuration of the internal combustion engine system 1 according to the present embodiment is the same as that of the first embodiment shown in FIGS. 1 to 4 described above, the description thereof will be omitted here.
In the present embodiment, the misfire determination process of the internal combustion engine 2 by the misfire determination unit 54 is different from that of the first embodiment, and the process of the misfire determination unit 54 in the present embodiment will be described below.

The misfire determination unit 54 in the present embodiment determines that the internal combustion engine 2 has misfired when the average value of the plurality of output results stored in the output storage unit 53 is equal to or greater than a predetermined threshold value. For example, the misfire determination unit 54 acquires the latest output result of a predetermined number of times from the output storage unit 53, and calculates the average value of the output results for the predetermined number of times. The misfire determination unit 54 determines that a misfire of the internal combustion engine 2 has occurred when the average value of the calculated output results exceeds a predetermined threshold value.

Next, the operation of the internal combustion engine system 1 according to the present embodiment will be described with reference to FIG. 7.
FIG. 7 is a flowchart showing an example of the operation of the internal combustion engine system 1 according to the present embodiment.

In FIG. 7, the processes from step S201 to step S204 are the same as the processes from step S101 to step S104 shown in FIG. 6 described above, and thus the description thereof will be omitted here.

In step S205, the misfire determination unit 54 generates the average value of the most recent predetermined number of times of the output result of the timer. That is, the misfire determination unit 54 acquires the output result of the timer 52 stored in the output storage unit 53 for the most recent predetermined number of times. The misfire determination unit 54 generates an average value of the output results of the timer 52 for the most recently acquired predetermined number of times.

Next, the misfire determination unit 54 determines whether or not the average value is equal to or greater than a predetermined threshold value (step S206). The misfire determination unit 54 advances the process to step S207 when the generated average value is equal to or greater than a predetermined threshold value (step S206: YES). Further, when the generated average value is less than a predetermined threshold value (step S206: NO), the misfire determination unit 54 returns the process to step S201.

In step S207, the misfire determination unit 54 determines that the internal combustion engine 2 has misfired. The misfire determination unit 54 outputs warning information indicating that a misfire of the internal combustion engine 2 has occurred, and turns on, for example, a warning light. After the process of step S207, the misfire determination unit 54 returns the process to step S201.

Further, since the processing of step S208 and step S209 is the same as the processing of step S107 and step S109 shown in FIG. 6 described above, the description thereof will be omitted here. After the process of step S209, the drive control unit 51 returns the process to step S201.

As described above, the internal combustion engine system 1 according to the present embodiment includes an internal combustion engine 2 having a crankshaft 3, a starting generator 4 (rotary electric machine), a rotor position detection unit 30, a drive control unit 51, and a misfire. A determination unit 54, a timer 52, and an output storage unit 53 that stores a plurality of output results immediately output by the timer 52 are provided. The misfire determination unit 54 (misfire detection unit 60) in the present embodiment states that the internal combustion engine 2 has misfired when the average value of the plurality of output results stored in the output storage unit 53 exceeds a predetermined threshold value. judge.

As a result, the internal combustion engine system 1 according to the present embodiment can obtain an average value even when the vehicle equipped with the internal combustion engine 2 suddenly exceeds a predetermined threshold value, such as when traveling on a rough road. By using it, it is possible to accurately determine that a misfire of the internal combustion engine 2 has occurred. That is, the internal combustion engine system 1 according to the present embodiment can reduce erroneous detection of misfire of the internal combustion engine 2 as in the first embodiment.

The present invention is not limited to each of the above embodiments, and can be modified without departing from the spirit of the present invention.
For example, in each of the above embodiments, an example in which a Hall element is used as an example of a magnetic sensor has been described, but the present invention is not limited to this, and another magnetic sensor may be used.

Further, in each of the above embodiments, the example in which the internal combustion engine system 1 includes three Hall elements 31 (31-1 to 31-3) of U phase, V phase, and W phase has been described. A Hall element 31 that generates an ignition timing signal for igniting the internal combustion engine 2 may be additionally provided.

Further, in each of the above embodiments, the example in which the rotor position determination unit 32 is included in the control unit 50 has been described, but the present invention is not limited to this, and the rotor position determination unit 32 is located outside the control unit 50. You may be prepared. Further, the control unit 50 is not limited to the control of the starting generator 4, and may include, for example, the control of the internal combustion engine 2.

Further, in each of the above embodiments, the example in which the starting generator 4 is a three-phase brushless motor having 12 poles and 18 slots has been described, but the present invention is not limited to this, and other pole numbers and other slots are used. It may be a number of motors.

Further, in the second embodiment described above, the misfire detection unit 60 (misfire determination unit 54) has described an example in which the average value of a plurality of output results is used, but weighting is considered instead of the simple average value. A weighted average value may be used.

Each configuration included in the internal combustion engine system 1 described above has a computer system inside. Then, a program for realizing the functions of each configuration included in the internal combustion engine system 1 described above is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed. Therefore, the processing in each configuration provided in the internal combustion engine system 1 described above may be performed. Here, "loading and executing a program recorded on a recording medium into a computer system" includes installing the program in the computer system. The term "computer system" as used herein includes hardware such as an OS and peripheral devices.
Further, the "computer system" may include a plurality of computer devices connected via a network including a communication line such as the Internet, WAN, LAN, and a dedicated line. Further, the "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, or a CD-ROM, or a storage device such as a hard disk built in a computer system. As described above, the recording medium in which the program is stored may be a non-transient recording medium such as a CD-ROM.

The recording medium also includes an internal or external recording medium that can be accessed from the distribution server to distribute the program. The program may be divided into a plurality of parts, downloaded at different timings, and then combined with each configuration provided in the internal combustion engine system 1, or the distribution server for distributing each of the divided programs may be different. Furthermore, a "computer-readable recording medium" is a volatile memory (RAM) inside a computer system that serves as a server or client when a program is transmitted via a network, and holds the program for a certain period of time. It shall also include things. Further, the above program may be for realizing a part of the above-mentioned functions. Further, a so-called difference file (difference program) may be used, which can realize the above-mentioned functions in combination with a program already recorded in the computer system.

Further, a part or all of the above-mentioned functions may be realized as an integrated circuit such as an LSI (Large Scale Integration). Each of the above-mentioned functions may be made into a processor individually, or a part or all of them may be integrated into a processor. Further, the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, when an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology, an integrated circuit based on this technology may be used.

1 Internal combustion engine system 2 Internal combustion engine 3 Crank shaft 4 Starting generator 5 Battery 10 Rotor 11 Magnet 11N N-pole magnet 11S S-pole magnet 20 Stator 21 Coil 21U U-phase coil 21V V-phase coil 21W W-phase coil 22 Sensor case 30 Rotor position Detection unit 31, 31-1, 31-2, 31-3 Hall element 32 Rotor position determination unit 40 Drive circuit 50 Control unit 51 Drive control unit 52 Timer 53 Output storage unit 54 Misfire detection unit 60 Misfire detection unit

Claims

An internal combustion engine with a crankshaft and
Under the first condition, a rotational force is applied to the crankshaft via a rotor directly connected to the crankshaft, and under a second condition different from the first condition, the rotational force of the crankshaft is applied. A rotating electric machine that receives and generates power,
A rotor position detection unit that detects the rotation position of the rotor and outputs rotor position information indicating the rotation position of the rotor.
Under the first condition, a drive control unit that controls a drive circuit that rotationally drives the rotor of the rotary electric machine based on the rotor position information output by the rotor position detection unit.
An internal combustion engine system including a misfire detection unit that detects that a misfire of the internal combustion engine has occurred based on the amount of change in the rotation position of the rotor per unit time based on the rotor position information.
The rotary electric machine has a stator in which a coil is wound, and a rotor in which a plurality of magnets are arranged alternately along an inner peripheral surface and rotatably arranged around the stator.
The rotor position detection unit is a plurality of magnetic sensors built in the rotary electric machine, and has a plurality of magnetic sensors arranged to face the rotor and detect and output the polarity of the magnets facing each other. The internal combustion engine system according to claim 1.
It is equipped with a timer that measures and outputs the time at which the output pattern output by the magnetic sensor is switched.
The internal combustion engine system according to claim 2, wherein the misfire detection unit detects that a misfire of the internal combustion engine has occurred based on a change in the switching interval time output by the timer.
The internal combustion engine system according to claim 3, wherein the misfire detection unit determines that a misfire of the internal combustion engine has occurred when the output value of the timer exceeds a predetermined threshold value.
It is provided with an output storage unit that stores a plurality of output results immediately output by the timer.
The misfire detection unit determines that a misfire of the internal combustion engine has occurred when, among the plurality of output results stored in the output storage unit, those having a predetermined threshold value or more occur more than a predetermined number of times. The internal combustion engine system according to claim 3.
It is provided with an output storage unit that stores a plurality of output results immediately output by the timer.
The claim is characterized in that the misfire detection unit determines that a misfire of the internal combustion engine has occurred when the average value of a plurality of the output results stored in the output storage unit exceeds a predetermined threshold value. 3. The internal combustion engine system according to 3.
The number of slots, which is the number of the coils, is 18.
The number of magnetic poles, which is the number of magnets, is 12.
The rotary electric machine functions as a three-phase brushless motor and functions as a three-phase brushless motor.
The internal combustion engine system according to any one of claims 2 to 6, wherein the plurality of magnetic sensors detect and output the polarities of the magnets corresponding to the three phases.
An internal combustion engine having a crankshaft and, under the first condition, apply a rotational force to the crankshaft via a rotor directly connected to the crankshaft, and under a second condition different from the first condition. A method for detecting a misfire in an internal combustion engine system including a rotating electric machine that generates power by receiving the rotational force of the crankshaft.
A rotor position detection step in which the rotor position detection unit detects the rotation position of the rotor and outputs rotor position information indicating the rotation position of the rotor.
A drive control step in which the drive control unit controls a drive circuit for rotationally driving the rotor of the rotary electric machine based on the rotor position information output by the rotor position detection step under the first condition.
The misfire detection unit includes a misfire detection step of detecting that a misfire of the internal combustion engine has occurred based on the amount of change in the rotation position of the rotor per unit time based on the rotor position information. Misfire detection method.