WO2021015183A1 - Power generator motor for internal combustion engine - Google Patents

Abstract

This rotary electric machine comprises a rotor (21) and a stator (31). The rotor (21) includes permanent magnets (23). The permanent magnets (23) provide a plurality of field magnetic poles (26) and at least one reference magnetic pole (27). The plurality of field magnetic poles (26) are arranged such that the polarities alternate. The reference magnetic pole (27) is located in at least one of the field magnetic poles (26). The stator (31) includes a single sensor (38). A sensor signal (SG) is obtained by observing the polarities of the magnetic poles with the single sensor (38) along a track (29). The sensor signal (SG) is used as a signal for making the rotary electric machine function as an electric motor. The sensor signal (SG) is also used as a reference position signal for controlling the ignition of an internal combustion engine.

Description

Motor generator for internal combustion engine Cross-reference of related applications

This application is based on Patent Application No. 2019-137285 filed in Japan on July 25, 2019, and the contents of the basic application are incorporated by reference as a whole.

The disclosure in this specification relates to a generator motor for an internal combustion engine.

Patent Document 1 discloses a rotary electric machine for an internal combustion engine. The contents of the prior art document are incorporated by reference as an explanation of the technical elements in this specification.

Japanese Patent No. 6286617

The rotary electric machine for an internal combustion engine of Patent Document 1 has both a sensor for controlling an electric motor and a sensor for controlling ignition. Further improvements are required in the generator motor for internal combustion engines in the above-mentioned viewpoint or in other viewpoints not mentioned.

One object disclosed is to provide a generator motor for an internal combustion engine in which the signal of one sensor is used for both motor control and ignition control.

The generator electric motor for an internal combustion engine disclosed herein includes a rotor having a plurality of field magnetic poles having alternating polarities, a reference magnetic pole indicating a reference position, a magnetic pole facing the field magnetic pole, and a multi-phase stator coil. A stator having a and, and a single sensor that detects a field magnetic pole and a reference magnetic pole and generates a sensor signal are provided.

The disclosed generator motor for an internal combustion engine provides an ignition control function for an internal combustion engine based on a reference position and an electric motor control function as an electric motor by a sensor signal from a single sensor. By realizing both functions with a single sensor, a signal system with a simple structure is constructed.

The plurality of aspects disclosed herein employ different technical means to achieve their respective objectives. The claims and the reference numerals in parentheses described in this section exemplify the correspondence with the parts of the embodiments described later, and are not intended to limit the technical scope. The objectives, features, and effects disclosed herein will be made clearer by reference to the subsequent detailed description and accompanying drawings.

It is sectional drawing of the rotary electric machine for an internal combustion engine which concerns on 1st Embodiment. It is a perspective view of a stator. It is sectional drawing of the rotation sensor. It is a waveform diagram which shows the signal waveform of a rotation sensor. It is a waveform figure which shows the behavior at the time of starting. It is a block diagram of an electric circuit. It is a waveform diagram which shows the energization waveform. It is a flowchart which shows the control as an electric motor. It is a flowchart which shows the control as an electric motor. It is sectional drawing of the rotation sensor which concerns on 2nd Embodiment. It is a partial breakthrough figure of the rotation sensor which concerns on 3rd Embodiment. It is a perspective view of the stator which concerns on 4th Embodiment. It is a perspective view of the stator which concerns on 5th Embodiment. It is a perspective view of the stator which concerns on 6th Embodiment. It is sectional drawing of the rotary electric machine for an internal combustion engine which concerns on 7th Embodiment. It is a top view of the rotary electric machine for an internal combustion engine. It is a waveform diagram which shows the signal waveform which concerns on 8th Embodiment. It is a waveform diagram which shows the signal waveform which concerns on 9th Embodiment. It is a waveform diagram which shows the signal waveform which concerns on 10th Embodiment. It is a waveform diagram which shows the signal waveform which concerns on 11th Embodiment. It is a waveform diagram which shows the signal waveform which concerns on 12th Embodiment.

A plurality of embodiments will be described with reference to the drawings. In a plurality of embodiments, functionally and / or structurally corresponding parts and / or associated parts may be designated with the same reference code or reference codes having a hundreds or more different digits. References can be made to the description of other embodiments for the corresponding and / or associated parts.

In FIG. 1, the rotary electric machine for an internal combustion engine is called a rotary electric machine 10. The rotary electric machine 10 provides a generator motor for an internal combustion engine. The rotary electric machine 10 is also referred to as a generator motor or an alternator starter (AC Generator Starter). The rotary electric machine 10 can function as a generator and an electric motor, and is selectively functioned as any of them. An example of an application of the rotary electric machine 10 is a generator motor of an internal combustion engine 12. The internal combustion engine 12 is used, for example, as a power source for a vehicle. The vehicle is a vehicle, ship, or aircraft, and a typical example is a saddle-riding vehicle. Vehicles include amusement equipment or simulation equipment. Further, the internal combustion engine 12 can also be used as a power source for a generator, an air conditioner, or a stationary device such as a pump. The internal combustion engine 12 is a 4-cycle engine.

The rotary electric machine 10 is electrically connected to an electric circuit 11 including an inverter circuit (INV) and a control device (ECU). The rotary electric machine 10 and the electric circuit 11 are connected by a signal line 15 for transmitting a sensor signal described later. The rotary electric machine 10 and the electric circuit 11 are connected by a power line 16 for transmitting an output power as a generator or an input power as an electric motor. The electric circuit 11 provides a multi-phase power conversion circuit.

The electric circuit 11 provides a rectifier circuit that rectifies the output AC power when the rotary electric machine 10 functions as a generator and supplies power to an electric load including a battery. The electric circuit 11 provides a signal processing circuit that receives a reference position signal for ignition control supplied from the rotary electric machine 10. The electrical circuit 11 may provide an ignition controller that performs ignition control. The electric circuit 11 provides a drive circuit that causes the rotary electric machine 10 to function as an electric motor. The electric circuit 11 receives a rotation position signal from the rotary electric machine 10 for causing the rotary electric machine 10 to function as an electric motor. The electric circuit 11 causes the rotary electric machine 10 to function as an electric motor by controlling the energization of the rotary electric machine 10 according to the detected rotation position.

The rotary electric machine 10 is assembled to the internal combustion engine 12. The internal combustion engine 12 has a body 13 and a rotating shaft 14 that is rotatably supported by the body 13 and rotates in conjunction with the internal combustion engine 12. The rotary electric machine 10 is assembled to the body 13 and the rotary shaft 14. The body 13 is a structure such as a crankcase and a mission case of the internal combustion engine 12. The rotary shaft 14 is a crankshaft of the internal combustion engine 12, or a rotary shaft that is interlocked with the crankshaft. The rotating shaft 14 rotates when the internal combustion engine 12 is operated.

The rotating shaft 14 rotates the rotating electric machine 10 so that the rotating electric machine 10 functions as a generator. The rotary shaft 14 is a rotary shaft capable of starting the internal combustion engine 12 by the rotation of the rotary electric machine 10 when the rotary electric machine 10 functions as an electric motor. Further, the rotating shaft 14 is a rotating shaft capable of assisting the rotation of the internal combustion engine 12 by the rotation of the rotating electric machine 10 when the rotating electric machine 10 functions as an electric motor.

The rotary electric machine 10 has a rotor 21, a stator 31, and a sensor unit 37. The rotor 21 is a field magnet. The stator 31 is an armature. In the following description, the term axial AD means the direction of the central axis when the stator 31 is regarded as a cylinder. The term RD in the radial direction means the radial direction when the stator 31 is regarded as a cylindrical body.

The rotor 21 is entirely cup-shaped. The rotor 21 is positioned with its open end facing the body 13. The rotor 21 is fixed to the end of the rotating shaft 14. The rotor 21 and the rotating shaft 14 are connected via a positioning mechanism in the rotating direction such as key fitting. The rotor 21 is fixed by being tightened to the rotating shaft 14 by the fixing bolt 25. The rotor 21 is directly connected to the internal combustion engine 12. The rotor 21 rotates together with the rotating shaft 14. The rotor 21 provides a field, that is, a rotating field, by means of a permanent magnet.

The rotor 21 has a cup-shaped rotor core 22. The rotor core 22 is connected to the rotating shaft 14 of the internal combustion engine 12. The rotor core 22 has an inner cylinder fixed to the rotating shaft 14, an outer cylinder located radially outside the inner cylinder, and an annular bottom plate extending between the inner cylinder and the outer cylinder. The rotor core 22 provides a yoke for a permanent magnet, which will be described later. The rotor core 22 is made of magnetic metal.

The rotor 21 has a permanent magnet 23 arranged on the inner surface of the rotor core 22. The permanent magnet 23 is fixed to the inside of the outer cylinder. The permanent magnet 23 is fixed with respect to the axial AD and the radial RD by the holding cup 24 arranged radially inside. The holding cup 24 is made of a thin non-magnetic metal. The holding cup 24 is fixed to the rotor core 22.

The permanent magnet 23 has a plurality of segments. Each segment is partially cylindrical. The permanent magnet 23 provides a plurality of N poles and a plurality of S poles inside the permanent magnet 23. The permanent magnet 23 provides at least a field magnet. The permanent magnet 23 provides a field of 6 pairs of N and S poles, that is, 12 poles by 12 segments. The number of magnetic poles may be another number. The field magnet is also called a field magnetic pole for power generation or an electric motor. The permanent magnet 23 provides a reference magnetic pole indicating a reference position for ignition control. The reference pole provides a reference position signal for ignition control. The reference pole is provided by a partial pole that is different from the pole arrangement for the field. The reference magnetic pole is also called a special magnetic pole or an irregular magnetized portion.

The stator 31 and the body 13 are connected via fixing bolts 34. The stator 31 is fixed by being tightened to the body 13 by a plurality of fixing bolts 34. The stator 31 is arranged between the rotor 21 and the body 13. The stator 31 has an outer peripheral surface that faces the inner surface of the rotor 21 via a gap. The stator 31 is fixed to the body 13.

The stator 31 has a stator core 32. The stator core 32 is arranged inside the rotor 21 by being fixed to the body 13 of the internal combustion engine 12. The stator core 32 has a plurality of teeth. One tooth provides one magnetic pole. The stator core 32 provides an outer salient pole type iron core.

The stator 31 has a stator coil 33 wound around a stator core 32. The stator coil 33 provides an armature winding. An electrically insulating resin insulator 36 is arranged between the stator core 32 and the stator coil 33. The insulator 36 provides a bobbin for the stator coil 33. The stator coil 33 is a multi-phase winding. The stator coil 33 is a three-phase winding. The stator coil 33 can selectively function the rotor 21 and the stator 31 as a generator or an electric motor.

The sensor unit 37 provides a rotation position detecting device for an internal combustion engine. The sensor unit 37 is provided in the rotary electric machine 10 linked to the internal combustion engine 12. The sensor unit 37 is provided on the stator core 32 of the rotary electric machine 10. The sensor unit 37 is fixed to the stator 31. The sensor unit 37 is fixed to the end face SD1 of the stator core 32. The sensor unit 37 is arranged between the stator core 32 and the body 13. The sensor unit 37 outputs an electric signal indicating the rotation position of the rotor 21 by detecting the magnetic flux supplied by the permanent magnet 23 provided in the rotor 21. The sensor unit 37 detects a reference position for ignition control based on the position of the reference magnetic pole provided by the permanent magnet 23. The rotation position of the rotor 21 is also the rotation position of the rotation shaft 14. Therefore, by detecting the rotation position of the rotor 21, a reference position signal for ignition control can be obtained. The sensor unit 37 detects the rotational position for control as an electric motor by alternating the field magnetic poles provided by the permanent magnet 23.

The sensor unit 37 has a single sensor 38. The single sensor 38 is arranged between two adjacent magnetic poles 35. The single sensor 38 detects the rotational position of the rotor 21 by detecting the change in the magnetic flux of the permanent magnet 23. The single sensor 38 reacts to both the field magnetic pole provided by the permanent magnet 23 and the reference magnetic pole. The single sensor 38 provides both a sensor for motor control and a sensor for ignition control. The single sensor 38 is a Hall effect element.

The sensor unit 37 includes a cover 41 for accommodating the single sensor 38. The cover 41 provides a sheath that protects the single sensor 38. The cover 41 protrudes from the main body of the sensor unit 37 in a finger shape or a rod shape.

The electric circuit 11 in this specification includes a control device. The control device may also be referred to as an electronic control device (ECU: Electronic Control Unit). The control device or control system is provided by (a) an algorithm as a plurality of logics called if-then-else form, or (b) a trained model tuned by machine learning, for example, an algorithm as a neural network. ..

The control device is provided by a control system that includes at least one computer. The control system may include multiple computers linked by data communication equipment. A computer includes at least one processor (hardware processor) which is hardware. The hardware processor can be provided by (i), (ii), or (iii) below.

(I) The hardware processor may be at least one processor core that executes a program stored in at least one memory. In this case, the computer is provided by at least one memory and at least one processor core. The processor core is called a CPU: Central Processing Unit, a GPU: Graphics Processing Unit, a RISC-CPU, or the like. Memory is also called a storage medium. Memory is a non-transitional and substantive storage medium that non-temporarily stores "programs and / or data" that can be read by a processor. The storage medium is provided by a semiconductor memory, a magnetic disk, an optical disk, or the like. The program may be distributed by itself or as a storage medium in which the program is stored.

(Ii) The hardware processor may be a hardware logic circuit. In this case, the computer is provided by a digital circuit that includes a large number of programmed logic units (gate circuits). The digital circuit is a logic circuit array, for example, ASIC: Application-Specific Integrated Circuit, FPGA: Field Programmable Gate Array, SoC: System on a Chip, PGA: Program License, PGA: Program Digital circuits may include memory for storing programs and / or data. Computers may be provided by analog circuits. Computers may be provided by a combination of digital and analog circuits.

(Iii) The hardware processor may be a combination of the above (i) and the above (ii). (I) and (ii) are arranged on different chips or on a common chip. In these cases, the part (ii) is also called an accelerator.

The control device, signal source, and controlled object provide various elements. At least some of those elements can be called blocks, modules, or sections. Moreover, the elements contained in the control system are called functional means only when intentionally.

The controls and methods thereof described in this disclosure are realized by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. May be done. Alternatively, the controls and methods thereof described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the controls and techniques described in this disclosure include a processor and memory programmed to perform one or more functions and a processor composed of one or more hardware logic circuits. It may be realized by one or more dedicated computers configured by a combination. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

In FIG. 2, the power line 16 is shown as a perspective state by a broken line to help understanding. The sensor unit 37 is arranged so as to extend in the radial direction along the plurality of magnetic poles 35 of the stator 31. The sensor unit 37 has a bush 37a made of rubber or elastomer. The signal line 15 passes through the bush 37a and is drawn into the sensor unit 37. The signal line 15 is connected to the single sensor 38 via an electric circuit component in the sensor unit 37.

The rotary electric machine 10 has a bracket 51 as a holding member for holding the signal line 15 and the power line 16. The bracket 51 is fixed to the stator 31. The bracket 51 is provided by a bent metal plate. The bracket 51 may be made of resin. The bracket 51 can be provided, for example, by a resin molded product. The bracket 51 may hold only the signal line 15 or only the power line 16.

In FIG. 3, the sensor unit 37 includes a substrate 42 as an electric circuit component, an electric element mounted on the substrate 42, an electric wire, and the like. The single sensor 38 is a through-hole mount device (TMD: Through hole Mount Device) having a lead wire 43. The single sensor 38 is connected to the substrate 42 via a lead wire 43. The board 42 is connected to the signal line 15. The substrate 42 is provided by a printed circuit board or a flexible substrate.

In FIG. 4, the rotor 21 includes a permanent magnet 23. The permanent magnet 23 includes a plurality of magnets 23a, 23b, 23c. The permanent magnet 23 includes three types of magnets having different magnetizing modes on the surfaces facing the stator 31 (inner surface in the radial direction). The permanent magnet 23 includes a plurality of magnets 23a that provide a field magnetic pole 26 as an S pole. The magnet 23a is also called a first magnet. The permanent magnet 23 includes a plurality of magnets 23b that provide a field magnetic pole 26 as an N pole. The magnet 23b is also called a second magnet. Further, the permanent magnet 23 includes a magnet 23c. The magnet 23c is also called a third magnet. The magnet 23c provides both a field magnetic pole 26 as an S pole and a reference magnetic pole 27. The reference magnetic pole 27 is formed within the range of one field magnetic pole 26. The reference magnetic pole 27 appears in an island shape on the inner surface of the magnet 23c in the radial direction. The entire circumference of the reference magnetic pole 27 is surrounded by the field magnetic pole 26. Therefore, the reference magnetic pole 27 is formed and appears in one field magnetic pole 26. The reference magnetic pole 27 is located at the center of the radial inner surface of the magnet 23c, at least in the circumferential direction. In other words, the polarity of one field magnetic pole appears on both sides of the reference magnetic pole 27 in the circumferential direction. The reference magnetic pole 27 is also located at the center of the magnet 23c on the inner surface in the radial direction in the axial direction. The field magnetic pole 26 and the reference magnetic pole 27 are formed on the inner surface in the radial direction facing the stator 31.

The magnets 23a, 23b, and 23c are arranged so that the polarities of the field magnetic poles 26 alternate along the circumferential direction of the rotor 21. When the magnet 23a and the magnet 23b provide a field magnetic pole 26 having opposite polarities, the magnet 23c provides a field magnetic pole 26 as an N pole and a reference magnetic pole 27. The plurality of field magnetic poles 26 and the reference magnetic poles 27 are arranged along the orbit 29.

The single sensor 38 is arranged on the stator 31. The single sensor 38 detects both the field magnetic pole 26 and the reference magnetic pole 27 and generates a sensor signal. The single sensor 38 is arranged in the orbit 29. The rotor 21 rotates and moves along the rotation direction RT. The stator 31 is stationary. As a result, the plurality of field magnetic poles 26 and one reference magnetic pole 27 pass in order over the single sensor 38. The single sensor 38 outputs a sensor signal SG corresponding to a plurality of field magnetic poles 26 and one reference magnetic pole 27.

The sensor signal SG is a waveform-shaped pulse wave. The sensor signal SG alternately alternates between high H and low L. The sensor signals SG are alternating in response to the plurality of field magnetic poles 26. The sensor signal SG defines a basic pulse period T26 corresponding to a plurality of field magnetic poles 26. The basic pulse period T26 corresponds to 30 (° CA). Further, the sensor signal SG alternates in response to the reference magnetic pole 27. The sensor signal SG includes short pulse waveforms of short pulse periods T1, T2, and T3 corresponding to the reference magnetic pole 27 and the field magnetic poles 26 before and after the reference magnetic pole 27. The short pulse periods T1, T2, and T3 are set to T1 = T2 = T3. The sensor signal SG includes a plurality of short pulse periods T1, T2, T3 having the same period due to the reference magnetic pole 27. The short pulse periods T1, T2, and T3 are shorter than the basic pulse period T26. Therefore, the sensor signal SG includes a plurality of pulses having different periods due to the reference magnetic pole 27 (T1 = T2 = T3 <T26).

The electric circuit 11 detects the arrival of the reference magnetic pole 27 by comparing the basic pulse period T26 with the short pulse periods T1, T2, and T3. The ratio of the basic pulse period T26 to the short pulse periods T1, T2, and T3 is set so as to enable the detection of the reference magnetic pole 27 even during the period when the rotation speed of the internal combustion engine 12 fluctuates. The ratio is set so as to enable the detection of the reference magnetic pole 27 even during the cranking period for starting the internal combustion engine 12, and the starting period for starting the rotation of the internal combustion engine 12 due to its own combustion. There is.

FIG. 5 shows the behavior of the rotary electric machine 10 and the internal combustion engine 12 in a system in which the rotary electric machine 10 and the internal combustion engine 12 are directly connected to each other on the crankshaft. The horizontal axis is the crank angle (° CA). The vertical axis indicates the torque CLTQ (Nm) required when cranking the internal combustion engine 12. The alternate long and short dash line indicates the rotation position (rotation angle) of the rotor 21. REF-P and REF-I indicate a reference position defined by the rising edge or falling edge of the reference magnetic pole 27. The reference positions REF-P and REF-I are set at around 60 (° CA) and around 420 (° CA). STBY indicates a stop position target range. The stop position target range is also called the standby range.

The internal combustion engine 12 completes a series of strokes in two rotations (720 (° CA)). The piston repeats the descending stroke DN and the ascending stroke UP. The combustion stroke POW, the exhaust stroke EXT, the intake stroke INT, and the compression stroke COM are defined by the opening / closing timing of the intake / exhaust valves of the internal combustion engine 12. They are slightly advanced with respect to the descending stroke DN and the ascending stroke UP.

When the internal combustion engine 12 is rotated in the forward direction, the torque CLTQ fluctuates like the forward torque FWTQ shown by the solid line. The cranking torque CLTQ reaches a maximum value in the process toward the compression top dead center in the forward torque FWTQ. The forward rotation of the rotary electric machine 10 may be blocked by the maximum value in the forward torque FWTQ, and the rotary electric machine 10 may stop.

When the internal combustion engine 12 is rotated in the reverse direction, the torque CLTQ fluctuates like the reverse torque RVTQ shown by the broken line. In the reverse torque RVTQ, the cranking torque CLTQ reaches a maximum value in the process toward the compression top dead center due to the reverse rotation. The reverse rotation of the rotary electric machine 10 is blocked by the maximum value in the reverse torque RVTQ, and the rotary electric machine 10 may stop. This is because when the internal combustion engine 12 is rotated in the reverse direction, the piston rises in the descending stroke DN in the combustion stroke POW. In other words, in the initial stage of the starting sequence for starting the internal combustion engine 12, the amount of energization to the rotary electric machine 10 is controlled to a limited state so that the generated torque does not exceed the maximum value of the cranking torque CLTQ. This restricted state is the same regardless of whether the rotary electric machine 10 rotates in the forward direction or in the reverse direction. At the final stage of the starting sequence, the amount of electricity supplied to the rotary electric machine 10 is controlled so that the generated torque exceeds the maximum value of the cranking torque CLTQ. Further, the reference positions REF-P and REF-I are set so that at least one reference position is observed between the maximum value of the forward torque FWTQ and the maximum value of the reverse torque RVTQ. It is desirable that the reference positions REF-P and REF-I are set so that both reference positions are observed between the maximum value of the forward torque FWTQ and the maximum value of the reverse torque RVTQ. In this embodiment, the initial stage is provided by standby position control.

In this embodiment, when the internal combustion engine 12 is started, the internal combustion engine 12 is controlled so as to always rotate once within the stop position target range. This control is executed by direct current energization, which is an open loop control, and forced commutation. This control is standby position control. Rotational direction information is acquired during standby position control. Further, based on the rotation direction information, synchronous commutation control, which is a closed loop control using the single sensor 38, is executed.

The following four cases can be considered as the behavior of the rotary electric machine 10 (behavior of the internal combustion engine 12) in the standby position control.

(1) First initial position ST1 + forward rotation When the rotary electric machine 10 rotates forward from the initial position ST1, the rotary electric machine 10 is stopped by the forward torque FWTQ. The rotary electric machine 10 reaches the intermediate position ST3 from the initial position ST1. During this time, rotation direction information is acquired. No reference position REF-I is observed between the initial position ST1 and the intermediate position ST3. Further, between the initial position ST1 and the intermediate position ST3, a plurality of edges showing a plurality of field magnetic poles 26 are observed.

(2) Second initial position ST2 + forward rotation When the rotary electric machine 10 rotates forward from the initial position ST2, the rotary electric machine 10 is stopped by the forward torque FWTQ. The rotary electric machine 10 reaches the intermediate position ST3 from the initial position ST2. During this time, rotation direction information is acquired. A reference position REF-I is observed between the initial position ST2 and the intermediate position ST3. Further, between the initial position ST2 and the intermediate position ST3, after the reference position REF-I is observed, a plurality of edges indicating a plurality of field magnetic poles 26 are observed.

(3) Third initial position ST3 + reverse rotation When the rotary electric machine 10 rotates in the reverse direction from the initial position ST3, the rotary electric machine 10 is stopped by the reverse torque RVTQ. The rotary electric machine 10 reaches the standby position SBP from the initial position ST3. During this time, rotation direction information is acquired. A reference position REF-I is observed between the initial position ST3 and the standby position SBP. After the reference position REF-I is observed, a plurality of edges indicating a plurality of field magnetic poles 26 are observed. Further, when the standby position SBP is reached, the reference position REF-P is observed last. However, after the reference position REF-I is last observed, no edge indicating the field magnetic pole 26 is observed, or only a limited number of edges are observed. The limited number is defined by the distance between the compression top dead center and the reference position and the number of magnetic poles of the rotor 21. In this embodiment, the limited number is 2.

(4) Fourth initial position ST4 + reverse rotation When the rotary electric machine 10 rotates in the reverse direction from the initial position ST4, the rotary electric machine 10 is stopped by the reverse torque RVTQ. The rotary electric machine 10 reaches the standby position SBP from the initial position ST4. During this time, rotation direction information is acquired. A reference position REF-P is observed between the initial position ST4 and the standby position SBP. However, after the reference position REF-I is last observed, no edge indicating the field magnetic pole 26 is observed, or only a limited number of edges are observed.

According to the behaviors (1) to (4), when the rotary electric machine 10 reaches the stop position target range, the rotary electric machine 10 is rotated forward from the standby position SBP in order to start the internal combustion engine 12. At this time, the rotary electric machine 10 is driven by synchronous commutation control, which is a closed loop control using a single sensor 38. The rotary electric machine 10 overcomes the forward torque FWTQ and enables the internal combustion engine 12 to be started.

In FIG. 6, the electric circuit 11 provides a control system that controls the rotary electric machine (M) 10 and the internal combustion engine (ENG) 12. The control system reversely rotates the internal combustion engine 12 by the rotary electric machine 10. Such behavior is also called swing bag control. The rotary electric machine 10 rotates the internal combustion engine 12 to a stop position target range. The stop position target range is also called the standby position range. The control system causes the internal combustion engine 12 to reach the stop position target range by the rotary electric machine 10, and then reverses the rotation direction of the rotary electric machine 10 to make it rotate forward. The control system rotates the rotary electric machine 10 in the forward direction and starts the internal combustion engine 12 from the stop position target range. In other words, in order for the rotary electric machine 10 to crank the internal combustion engine 12, the control system takes a run-up distance and momentum to overcome the high cranking torque at the compression top dead center. The electric circuit 11 includes an ignition control unit 61. The ignition control unit 61 inputs the sensor signal SG from the single sensor 38 via the signal line 15, controls the ignition of the internal combustion engine 12, and further adjusts the ignition timing. The ignition control unit 61 detects a reference position based on the sensor signal SG and controls the ignition of the internal combustion engine 12. The ignition control unit 61 controls the ignition device of the internal combustion engine 12.

The electric circuit 11 includes a start switch (STSW) 62 that generates a start command for the internal combustion engine 12 by inputting a user's operation. The start switch 62 is also called a starter switch. The electric circuit 11 includes a control unit (CNT) 63 that executes a preset start sequence in response to a start command from the start switch 62. The control unit 63 inputs the sensor signal SG from the single sensor 38 via the signal line 15. The sensor signal SG is input as one of the three-phase signals indicating the rotation position. The sensor signal SG is input as, for example, a U-phase signal. The electric circuit 11 includes a signal generation unit (SGG) 65 that generates a signal of the remaining two phases of the three-phase signal based on the sensor signal SG. The two phases from the signal generation unit 65 and the one phase from the single sensor 38 are also called three-phase estimation signals. The signal generation unit 65 estimates the period based on, for example, the two rising edges and the falling edges of the sensor signal SG, and generates a V-phase signal and a W-phase signal based on the U-phase signal. The control unit 63 controls the inverter circuit (INV) 64. The inverter circuit 64 generates input power that causes the rotary electric machine 10 to function as an electric motor. The generated polymorphic power is supplied to the stator coil 33 of the rotary electric machine 10 via the power line 16. The start switch 62, the control unit 63, the inverter circuit 64, and the signal generation unit 65 are electric motor control units that rotate the rotor 21 as an electric motor by controlling the energization of the stator coil 33 based on the sensor signal SG. I will provide a.

The control unit 63 includes a standby position control unit (STBC) 66, a rotation direction information acquisition unit (RDIC) 67, and a synchronous commutation control unit (SYMC) 68 in order to enable motor control by a single sensor 38. Be prepared.

When the standby position control unit 66 receives a start command from the start switch 62, the standby position control unit 66 rotates the rotor 21 so as not to exceed the maximum value of the cranking torque of the internal combustion engine 12. The standby position control unit 66 activates the rotary electric machine 10 as a brushless motor by DC excitation and forced commutation. Further, the standby position control unit 66 rotates the rotary electric machine 10 based on the three-phase estimation signal including the sensor signal SG. The standby position control unit 66 executes 120-degree energization. At this time, the standby position control unit 66 provides a limiting unit that limits the input power so that the rotary electric machine 10 outputs the limited torque. The limited generated torque allows the rotary electric machine 10 directly connected to the internal combustion engine 12 to rotate between the leading compression top dead center and the succeeding compression top dead center. However, the limited generated torque prohibits the rotary electric machine 10 from rotating over the preceding compression top dead center and the succeeding compression top dead center. That is, the limited generated torque allows the rotary electric machine 10 to rotate only in a part of one cycle including a plurality of strokes of the internal combustion engine 12. The limited generated torque prohibits the rotary electric machine 10 from rotating over a plurality of cycles.

The rotation direction information acquisition unit 67 acquires an energization pattern for rotating the rotary electric machine 10 in the positive direction during the period in which the rotary electric machine 10 is rotated by the standby position control unit 66. In this embodiment, the rotation direction information acquisition unit 67 acquires an energization pattern for rotating the rotation electric machine 10 in the positive direction based on the behavior of the rotary electric machine 10 by the standby position control unit 66. The behavior of the rotary electric machine 10 includes a stop position of the rotor 21 defined by the cranking torque CLTQ of the internal combustion engine 12 and a rotation direction of the rotor 21. In other words, the rotation direction information acquisition unit 67 specifies an energization pattern for rotating the rotation electric machine 10 in the positive direction from a position where the rotary electric machine 10 is stopped by the standby position control unit 66. The rotation direction information acquisition unit 67 identifies the rotor 21 as an energization pattern for rotating the energization pattern opposite to the energization pattern controlled toward the stop position target range (standby range) STBY in the forward rotation. The energization pattern is a pattern in which the multi-phase electric power supplied to the stator coil 33 is commutated. The energization pattern is also called a commutation sequence.

The synchronous commutation control unit 68 commutates the multi-phase power supplied to the stator coil 33 by closed loop control according to the sensor signal SG based on the energization pattern specified by the rotation direction information acquisition unit 67. As a result, the synchronous commutation control unit 68 rotates the rotor 21. The synchronous commutation control unit 68 rotates the rotary electric machine 10 as a starter motor based on the three-phase estimation signal. The synchronous commutation control unit 68 controls the input power so that the rotary electric machine 10 rotates over the compression top dead center. The synchronous commutation control unit 68 executes 180-degree energization. In other words, the synchronous commutation control unit 68 executes energization control for starting the internal combustion engine 12.

In FIG. 7, a U-phase current when energized at 120 degrees and a U-phase current when energized at 180 degrees are shown. 120 degree energization is also called 120 degree square wave energization. 180 degree energization is also called 180 degree square wave energization. Instead of 180 degree energization, 180 degree sine wave energization or 180 degree pseudo sine wave energization may be executed.

FIG. 8 shows a control process 170 executed by a processor included in the electric circuit 11. In step 171 the preparatory process is executed. The preparatory process includes step 172 and step 173. In step 172, the standby position control process is executed. Step 172 provides a standby position control unit 66. In step 173, the rotation direction information acquisition process is executed. In step 173, information indicating the rotation direction of the rotor 21 is acquired based on the behavior of the rotary electric machine 10 accompanying the standby position control. In step 173, for example, information indicating the rotation direction of the rotor 21 is acquired based on a comparison between the basic pulse period T26 and the short pulse periods T1, T2, and T3. Step 173 provides a rotation direction information acquisition unit 67. In step 174, an energization pattern for rotating the rotary electric machine 10 in the forward direction from the standby position is characterized based on the rotation direction information acquired in step 173. In step 175, 180 degree energization control is executed. As a result, the rotary electric machine 10 rotates powerfully so as to start the internal combustion engine 12. In step 176, it is determined whether or not the start of the internal combustion engine 12 is completed. In step 176, if the internal combustion engine 12 has not started, step 175 is repeated. When the start of the internal combustion engine 12 is completed in step 176, the process ends. Steps 175 and 176 are executed in response to the sensor signal SG from the single sensor 38, and steps 175 and 176 provide a synchronous commutation control unit 68.

FIG. 9 shows the details of step 171. In step 171, direct current energization is performed on the three-phase winding of the stator coil 33. DC energization is a control that energizes the two-phase winding of the three-phase windings for a limited time. By direct current energization, the rotary electric machine 10 rotates in the forward direction or the reverse direction. This DC energization is repeated until the sensor signal SG detects the switching of the field magnetic poles 26.

In step 182, a process for generating a three-phase estimation signal is executed. Here, the sensor signal SG is used as one phase, and the remaining two phases having a predetermined phase difference are generated. The three-phase estimation signal has a U phase, a V phase, and a W phase. Step 182 provides a signal generation unit 65. In step 183, a plurality of energization patterns (commutation patterns) are generated based on the three-phase estimation signal. The plurality of energization patterns include an energization pattern for forward rotation and an energization pattern for reverse rotation. In step 184, any one of the generated energization patterns is selected. Here, if there is already a selected energization pattern, the energization pattern is switched. In step 185, 120 degree energization is performed based on the selected energization pattern. In step 186, it is determined whether or not an edge indicating the switching of the field magnetic pole 26 is detected from the sensor signal SG. If no edge is detected, the rotary electric machine 10 is not rotating. In this case, the process returns to step 184, and the energization pattern is switched. By the process of step 181-186, the rotary electric machine 10 is continuously rotated in the forward direction or the reverse direction.

In step 187, it is determined whether or not the rotor 21 has stopped. The 120 degree energization provided by step 181-186 is also a process of limiting the output torque of the rotary electric machine 10. Step 187 determines whether or not the rotary electric machine 10 is stopped by the forward torque FWTQ or the reverse torque RVTQ. The 120-degree energization in step 185 is continued until the rotor 21 is stopped. If the rotor 21 is stopped, the process proceeds to step 188.

In step 188, it is determined whether or not the waveform of the reference magnetic pole is detected in the process of step 181-step 187. When the reference magnetic pole is not detected, it can be determined that the case is the above-mentioned "(1) first initial position ST1 + forward rotation". In this case, the rotary electric machine 10 is considered to be in the third initial position ST3. In this case, the process returns to step 182. In step 184, an energization pattern for rotating the rotary electric machine 10 in the reverse direction is selected. As a result, the rotary electric machine 10 is rotated from the third initial position ST3 to the standby position SBP. If the determination in step 188 is YES, the process proceeds to step 189.

In step 189, the number of edges N and the threshold value Pth are compared. The number of edges N is the number of edges N further detected after the reference magnetic pole last detected in the process of steps 181 to 187. The threshold value Pth is a preset numerical value set according to the number of field magnetic poles 26 and the position of the reference magnetic pole 27. The position of the reference magnetic pole 27 is set so that an appropriate number of edges are observed after the rotary electric machine 10 rotates in the opposite direction. At the same time, the position of the reference magnetic pole 27 is set so that the ignition timing control is executed with high accuracy. In this embodiment, Pth = 2.

When the number of edges N exceeds the threshold value Pth (N> Pth), it can be determined that it is the case of the above-mentioned "(2) second initial position ST2 + forward rotation". In this case, the rotary electric machine 10 is considered to be in the third initial position ST3. In this case, the process returns to step 182. In step 184, an energization pattern for rotating the rotary electric machine 10 in the reverse direction is selected. As a result, the rotary electric machine 10 is rotated from the third initial position ST3 to the standby position SBP.

When the number of edges N is equal to or less than the threshold value Pth (N = Pth, N <Pth), the above-mentioned "(3) third initial position ST3 + reverse rotation" or "(4) fourth initial position ST4 + reverse rotation" It can be determined that this is the case. In this case, it is considered that the rotary electric machine 10 has reached the standby position SBP. In this case, the process proceeds to step 174. Step 174-By the process of step 176, the rotary electric machine 10 is driven as a starter motor to generate high torque, and the internal combustion engine 12 is started.

The control device provided by the electric circuit 11 executes the following processing. First, when the control device outputs a pulse signal (which may be H or L) sufficiently shorter than the other pulses from the single sensor 38, a reference position signal, that is, a trigger signal for ignition control (ignition trigger) is generated. Is determined. When the control device recognizes the ignition trigger even once, the ignition trigger is generated again by using the counter. In other words, the position of the ignition trigger, that is, the position of the reference magnetic pole can be stored in the counter. After the internal combustion engine 12 is started, ignition control can be executed based on the position of the ignition trigger stored by a counter or the like. Even in such a case, it is desirable that the position of the ignition trigger indicated by the reference magnetic pole is periodically confirmed based on the sensor signal SG. The confirmation method confirms that the time of the pulse wave indicating the ignition trigger is shorter than the preset value. Further, as the confirmation method, the time change rate of a plurality of pulse waves other than the pulse wave indicating the ignition trigger may be compared with the time change rate including the pulse wave indicating the ignition trigger.

The change in the rotation speed of the rotary electric machine 10 can be recognized by the rate of change in time between edges other than the ignition trigger. When the rotation speed increases, such as when the internal combustion engine 12 is started, the pulse of the reference magnetic pole, which is sufficiently shorter than the other pulses, is identified per pulse due to the increase acceleration of the rotation speed preset after the start of rotation. It can be executed when a waveform with a time shorter than the time reduction width of is entered.

The control of the rotary electric machine 10 as an electric motor executes energization of one phase preset with the sensor signal SG from the single sensor 38 as a reference waveform, and the other phase calculates and processes the reference waveform to execute energization. For example, when the U-phase energization is synchronized with the sensor signal SG, the other V-phase and the W-phase execute energization with the sensor signal SG shifted by an electric angle of 120 degrees. Since the sensor signal SG includes a pulse indicating the reference magnetic pole, a problem may occur if commutation corresponding to this pulse is executed. Defects include, for example, a decrease in output torque as an electric motor and / or an increase in output torque pulsation. Since the control device can determine the pulse indicating the reference magnetic pole, it is desirable to prohibit commutation at the position of the reference magnetic pole.

When the rotary electric machine 10 is stopped at the position where the reference magnetic pole is detected, it may be opposite to the energization phase of the original electric motor defined by the field magnetic pole 26. With this, it cannot function as an electric motor. Therefore, when the rotary electric machine 10 does not rotate even when the power is turned on for a predetermined time, that is, when the sensor signal SG does not reverse, the power supply can be temporarily stopped and the power supply having the opposite phase can be executed.

When a start command is input from the start switch 62, DC energization processing by open loop control is executed. The sensor signal of the single sensor 38 when the start command is input from the start switch 62 is observed. Using a preset energization pattern corresponding to this sensor signal, the rotary electric machine 10 is energized for a predetermined very short time to apply rotational force, and then the energization is cut off. This process is a direct current energization process. The direction of rotation by open loop control is indefinite. The sensor signal is further observed while the rotary electric machine 10 rotates and the rotor 21 further rotates due to the inertia of the rotor 21. When the single sensor 38 reaches the field magnetic pole 26 or the reference magnetic pole 27, a falling or rising edge (H → L or L → H) is generated in the sensor signal. When the edge signal is input, the control system recognizes that the rotary electric machine 10 has started to rotate. The control system commutates to the energization pattern according to the first observed edge based on the sensor signal SG by the single sensor 38. The control system re-energizes and applies a rotational force to the rotary electric machine 10. Similar to the first energization after the start command, the energization is performed for a very short time and then shut off, so that the rotation is maintained by the inertia of the rotor 21 and the next edge is generated. Since the second edge is observed, the next commutation timing can be calculated from the time between the first edge and the second edge. Therefore, the process of shutting off immediately after energization is completed, and the energization is performed in synchronization with the sensor signal SG. After that, synchronous commutation control is executed.

Note that the rotary electric machine 10 does not always rotate in the reverse direction, so it is necessary to determine the direction of rotation. In this embodiment, the waveform indicating the reference magnetic pole is always observed once in the range of 360 (° CA) (condition 1). Further, the cranking torque is large in the predetermined range toward the compression top dead center in the forward rotation and in the predetermined range toward the compression top dead center in the reverse rotation. Therefore, when DC energization or 120 degree energization is performed, the internal combustion engine 12 cannot overcome the compression top dead center and therefore stops (Condition 2). The predetermined range is, for example, about 120 (° CA) before the compression top dead center in both the forward rotation and the reverse rotation. Based on these two conditions (condition 1 and condition 2), forward rotation and reverse rotation can be determined.

For example, in this embodiment, the reference magnetic pole can be set to 60 (° CA) after top dead center. In this case, it can be considered as follows. The rotary electric machine 10 is rotated until it is stopped by the cranking torque. In this case, forward rotation and reverse rotation are determined by the number of edges from the observation of the last reference magnetic pole to the stop of the rotary electric machine 10. If the number of edges is equal to or less than the threshold value Pth, the rotation is reverse. If the number of edges exceeds the threshold value Pth, the rotation is forward. When the reference magnetic pole is set to 60 (° CA) after top dead center and the rotor 21 has 12 poles, the threshold Pth is 2.

According to the embodiment described above, a rotary electric machine for an internal combustion engine including a single sensor 38 is provided. The single sensor 38 has a small area occupied by the stator 31, and contributes to improving heat dissipation performance from the stator 31. The single sensor 38 also contributes to the miniaturization of the signal line 15. The single sensor 38 makes it possible to easily lay the signal line 15. The single sensor 38 facilitates the holding of the signal line 15.

Further, according to this embodiment, both the ignition timing control and the control as an electric motor are provided by the single sensor 38. Moreover, since the reference magnetic pole 27 is provided in the field magnetic pole 26 while maintaining the width of the field magnetic pole 26, a waveform that is easy to use for control as an electric motor can be obtained. By obtaining a waveform (edge) indicating the width of the field magnetic pole 26, control as an electric motor is executed with a high system.

Second Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the single sensor 38 is provided by TMD. Alternatively, the single sensor 38 may be provided by SMD.

In FIG. 10, the sensor unit 37 has a substrate 242 as an electric circuit component. The substrate 242 includes an electric element mounted on the surface or inside thereof, an electric wire, and the like. The single sensor 38 is a surface mount device (SMD: Surface Mount Device). The single sensor 38 is mounted on the substrate 242. The substrate 242 is arranged inside the cover 41. According to this embodiment, the single sensor 38 is securely held in the cover 41.

Third Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the sensor unit 37 extends radially along the stator 31. Instead, the sensor unit 37 can be provided solely by the cover 41.

In FIG. 11, the sensor unit 337 is provided only by the cover 41. The single sensor 38 is an SMD. According to this embodiment, a small sensor unit 337 is provided.

Fourth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the sensor unit 37 and the signal line 15 are fixedly connected. Instead of this, the sensor unit 37 and the signal line 15 may be detachably connected by a connector 445.

In FIG. 12, the sensor unit 37 and the signal line 15 are connected by a connector 445. The connector 445 is removable. According to this embodiment, the sensor unit 37 or the rotary electric machine 10 for which the work of arranging the signal line 15 is easy is provided.

Fifth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the sensor unit 37, 337 itself is fixed to the stator 31. Instead of this, the sensor units 37 and 337 may be fixed to the stator 31 by the bracket 51.

In FIG. 13, the bracket 51 has a sensor holding portion 552. The sensor holding portion 552 is provided by a protruding piece continuous from the bracket 51. When the bracket 51 is provided by a metal plate, the protruding piece is a metal plate. The protruding piece may be provided by a metal piece with reinforcing ribs. When the bracket 51 is made of resin, the protruding piece is made of resin. The sensor holding unit 552 holds the sensor unit 537. The sensor unit 537 has a cover 41. The cover 41 holds the single sensor 38 between the plurality of magnetic poles 35. According to this embodiment, the bracket 51 holds the signal line 15 and / or the power line 16 and positions the single sensor 38 in a predetermined position. According to this embodiment, a multifunctional bracket 51 is provided. A plurality of functions can be integrated in the bracket 51. Further, the number of parts fixed on the stator 31 is suppressed. This provides a wide exposed surface on the stator 31. From another point of view, a rotary electric machine 10 that is easy to manufacture is provided.

Sixth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the single sensor 38 is held by the sensor units 37, 337, 537. Instead, the single sensor 38 may be held by the insulator 36.

In FIG. 14, the single sensor 38 is arranged on the collar portion 641 of the bobbin provided by the insulator 36. The collar portion 641 provides a cover for holding the single sensor 38. According to this embodiment, the single sensor 38 is arranged using the insulator 36. Further, the number of parts fixed on the stator 31 is suppressed. This provides a wide exposed surface on the stator 31. From another point of view, a rotary electric machine 10 that is easy to manufacture is provided.

Seventh Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the single sensor 38 is arranged so as to face the permanent magnet 23 in the radial direction. Instead of this, the single sensor 38 may be arranged so as to face the permanent magnet 23 in the axial direction.

In FIG. 15, the single sensor 38 is arranged in the axial direction of the permanent magnet 23. The sensor unit 37 includes a cover 741 for holding the single sensor 38. The cover 741 is positioned so as to project radially from the stator 31. The cover 741 positions the single sensor 38 so as to face the axial end face of the permanent magnet 23.

In FIG. 16, a plan view seen from the direction of arrow XVI in FIG. 15 is shown. The plurality of magnets 23a and 23b are magnetized so that the field magnetic poles 26a and 26b appear on the axial end faces of the partially cylindrical magnets. The magnet 723c is magnetized so that the field magnetic pole 26a and the reference magnetic pole 27 appear on the axial end surface of the partially cylindrical magnet. Also in this embodiment, the reference magnetic pole 27 is formed within the range of one field magnetic pole 26. In other words, the polarity of one field magnetic pole appears on both sides of the reference magnetic pole 27 in the circumferential direction. The field magnetic pole 26 and the reference magnetic pole 27 are formed on the axial end faces. Only the plurality of field magnetic poles 26a and 26b appear on the radial inner surfaces of the plurality of magnets 23a, 23b and 723c. When the rotor 21 rotates, the plurality of field magnetic poles 26 and the reference magnetic poles 27 pass through the single sensor 38 in order. The plurality of field magnetic poles 26 and the reference magnetic pole 27 change the magnetic flux passing through the single sensor 38. As a result, the single sensor 38 outputs the sensor signal SG. According to this embodiment, since only the plurality of field magnetic poles 26a and 26b appear on the radial inner surfaces of the plurality of magnets 23a, 23b and 723c, the areas of the field magnetic poles 26a and 26b are not impaired.

Eighth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the reference magnetic pole 27 is arranged at the central portion or the end portion of the field magnetic pole 26. Instead, the reference magnetic pole 27 may extend axially along the central portion of the field magnetic pole 26.

In FIG. 17, the magnet 823c has a field magnetic pole 26 on the inner surface in the radial direction. Further, the magnet 823c has a reference magnetic pole 27 from one edge in the axial direction to the other edge in the axial direction on the inner surface in the radial direction. In the magnet 823c, the field magnetic pole 26 and the reference magnetic pole 27 appear in a striped pattern. Field magnetic poles 26 are located on both sides of the reference magnetic pole 27 in the circumferential direction. Also in this embodiment, the reference magnetic pole 27 is formed within the range of one field magnetic pole 26. In other words, the polarity of one field magnetic pole appears on both sides of the reference magnetic pole 27 in the circumferential direction. Also in this embodiment, the sensor signal SG is obtained by the single sensor 38.

Ninth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the reference magnetic pole 27 is arranged at the central portion in the circumferential direction. Instead, the reference magnetic poles 27 may be biased forward or backward with respect to the circumferential direction.

In FIG. 18, the magnet 923c has a field magnetic pole 26 on the inner surface in the radial direction. Further, the magnet 923c has a reference magnetic pole 27 that is biased rearward with respect to the circumferential direction on the inner surface in the radial direction. The reference magnetic pole 27 is surrounded by a field magnetic pole 26 on its entire circumference. As a result, the short pulse periods T1, T2, and T3 are observed from the sensor signal SG of the single sensor 38. The short pulse periods T1, T2, and T3 are set to T1> T2> T3. The sensor signal SG includes a plurality of pulses having different periods due to the reference magnetic pole 27 (T26> T1> T2> T3).

The rotation direction of the rotor 21 is detected by comparing at least two of the short pulse periods T1, T2, and T3. For example, the rotation direction of the rotor 21 is detected by comparing the elapsed time in the short pulse period T1 with the elapsed time in the short pulse period T3. The difference between the short pulse periods T1, T2, and T3 is set according to the amount of fluctuation in the rotational speed of the internal combustion engine 12. The short pulse periods T1, T2, and T3 are set so that the difference between the short pulse periods T1, T2, and T3 can be observed even under the rotational acceleration assumed when the internal combustion engine 12 is cranked, for example. To.

In this embodiment, the control system of FIG. 6 is constructed and the control process 170 of FIG. 8 is executed. In step 173, the rotation direction of the rotor 21 is specified by observing the short pulse periods T1, T2, and T3. In step 174, the energization pattern for forward rotation is specified based on the observation result in step 173. Therefore, also in this embodiment, the rotation direction information acquisition unit 67 acquires an energization pattern for rotating the rotary electric machine 10 in the positive direction during the period in which the rotary electric machine 10 is rotated by the standby position control unit 66. The rotation direction information acquisition unit 67 determines the rotation direction based on two pulse periods (T1, T2, T3, T4, T26) generated by the reference magnetic pole 27 and have different periods, and the energization at that time. Based on the pattern, the energization pattern for rotating in the forward direction is specified. Then, the synchronous commutation control unit 68 commutates the multi-phase power supplied to the stator coil 33 by closed loop control according to the sensor signal SG based on the energization pattern specified by the rotation direction information acquisition unit 67.

Also in this embodiment, the sensor signal SG can be obtained by the single sensor 38. Further, the rotation direction information for determining the rotation direction of the rotor 21 can be acquired based on the sensor signal SG.

Tenth Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the short pulse periods T1, T2, and T3 are set to T1>T2> T3. Instead, the short pulse periods T1, T2, and T3 may be set to T1 <T2 <T3. The short pulse periods T1, T2, and T3 may be set to T2 <T1 <T3 or T1 <T3 <T2.

In FIG. 19, the magnet AB23c has a reference magnetic pole 27 that is biased forward in the circumferential direction on the inner surface in the radial direction. The short pulse periods T1, T2, and T3 are set to T1 <T2 <T3. The sensor signal SG includes a plurality of pulses having different periods due to the reference magnetic pole 27 (T26> T3> T2> T1). The same effect as that of the preceding embodiment can be obtained in this embodiment as well.

Eleventh Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the reference magnetic pole 27 is arranged at the central portion of the field magnetic pole 26. Instead of this, the reference magnetic pole 27 may be arranged at the end of the field magnetic pole 26.

In FIG. 20, the magnet B23c has a field magnetic pole 26 on the inner surface in the radial direction. Further, the magnet B23c has a reference magnetic pole 27 at an axial edge on the inner surface in the radial direction. Along the orbit 29, the polarities are alternately alternated by the field magnetic poles 26a and 26b. Further, in the magnet B23c, the polarities are alternately alternated by the reference magnetic pole 27 for indicating the reference position. Also in this embodiment, the reference magnetic pole 27 is formed within the range of one field magnetic pole 26. However, the reference magnetic pole 27 is not surrounded by the field magnetic pole 26. In other words, the polarity of one field magnetic pole appears on both sides of the reference magnetic pole 27 in the circumferential direction. Also in this embodiment, the sensor signal SG is obtained by the single sensor 38.

12th Embodiment This embodiment is a modification based on the preceding embodiment as a basic embodiment. In the above embodiment, the reference magnetic pole 27 has field magnetic poles 26 both forward and backward in the circumferential direction. Instead, the reference magnetic pole 27 may have a field magnetic pole 26 only forward or backward in the circumferential direction.

In FIG. 21, the magnet C23c has a field magnetic pole 26 on the inner surface in the radial direction. Further, the magnet C23c has a reference magnetic pole 27 arranged at a rear corner with respect to the circumferential direction on the inner surface in the radial direction. Therefore, in the magnet C23c, the reference magnetic pole 27 has a field magnetic pole 26 only in the front in the circumferential direction. The polarity provided by the reference magnetic pole 27 is the same as the polarity of the field magnetic pole provided by other adjacent magnets. Also in this embodiment, the reference magnetic pole 27 is formed within the range of one field magnetic pole 26. However, the reference magnetic pole 27 is not surrounded by the field magnetic pole 26. In other words, the polarity of one field magnetic pole appears on one side of the reference magnetic pole 27 in the circumferential direction.

When the field magnetic pole 26 and the reference magnetic pole 27 are observed by the single sensor 38, the sensor signal SG is obtained. The sensor signal SG includes a short pulse period T1 and a long pulse period T4 due to the reference magnetic pole 27. The short pulse period T1 is shorter than the basic pulse period T26. The long pulse period T4 is longer than the basic pulse period T26. Therefore, the rotation direction of the rotor 21 is detected by comparing the short pulse period T1 and the long pulse period T4. Moreover, since the long pulse period T4 is longer than the basic pulse period T26, accuracy that is difficult to obtain by comparing the short pulse period T1 and the basic pulse period T26 can be obtained. The sensor signal SG includes a plurality of pulses having different periods due to the reference magnetic pole 27 (T4> T26> T1). The same effect as that of the preceding embodiment can be obtained in this embodiment as well.

Note that the magnet C23c may have a reference magnetic pole 27 arranged at a front corner in the circumferential direction on the inner surface in the radial direction. In this case, in the magnet C23c, the reference magnetic pole 27 has a field magnetic pole 26 only at the rear in the circumferential direction. In this modification as well, the same effect as that of the preceding embodiment can be obtained.

Other Embodiments The disclosure in this specification, drawings and the like is not limited to the exemplified embodiments. The disclosure includes exemplary embodiments and modifications by those skilled in the art based on them. For example, disclosure is not limited to the parts and / or element combinations shown in the embodiments. Disclosure can be carried out in various combinations. The disclosure can have additional parts that can be added to the embodiment. The disclosure includes the parts and / or elements of the embodiment omitted. Disclosures include replacement or combination of parts and / or elements between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. Some technical scopes disclosed are indicated by the claims description and should be understood to include all modifications within the meaning and scope equivalent to the claims statement.

Disclosure in the description, drawings, etc. is not limited by the description of the scope of claims. The disclosure in the specification, drawings, etc. includes the technical ideas described in the claims, and further covers a wider variety of technical ideas than the technical ideas described in the claims. Therefore, various technical ideas can be extracted from the disclosure of the description, drawings, etc. without being bound by the description of the claims.

In the above embodiment, the standby position control is executed after receiving the command from the start switch 62. Instead of this, the standby position control may be executed when the internal combustion engine 12 is stopped. In this case, step 171 is executed within a predetermined period after the internal combustion engine 12 is instructed to stop. Step 174 and subsequent steps are executed when the internal combustion engine 12 is instructed to start. The rotation direction information for rotating the rotary electric machine 10 in the forward direction (commutation sequence for rotating the rotary electric machine 10 in the forward direction from the standby position) is stored in the control device and used in step 174 at the time of starting.

In the above embodiment, the rotor 21 includes one reference magnetic pole 27 so that one reference position is detected in one rotation (360 degrees) of the rotary electric machine 10. Instead, the rotor 21 may include two or more reference magnetic poles 27. At least one reference pole 27 is used to indicate a reference position for ignition control. Further, the remaining reference magnetic poles 27 are used to acquire information for determining the rotation direction of the rotary electric machine 10 and the internal combustion engine 12. In this case as well, the plurality of reference magnetic poles 27 are detected by the single sensor 38.

In the above embodiment, the rotary electric machine 10 is controlled as a starter motor by operating the start switch 62. Instead, when the internal combustion engine 12 is provided with a human-powered starting device such as a kick starter, the internal combustion engine 12 is controlled as a starter motor to support the human-powered starting device when the human-powered starting device is operated by a user. May be good. Also in this case, the start switch 62 detects the operation of the human-powered starter by the user and outputs a start command. In this case as well, it can be said that the rotor 21 is directly connected to the internal combustion engine 12 via the human-powered starting device.

In the above embodiment, the internal combustion engine 12 is a 4-cycle engine. Instead, the internal combustion engine 12 may be a two-stroke engine.

Claims (10)

1. A rotor (21) having a plurality of field magnetic poles (26) having alternating polarities and a reference magnetic pole (27) indicating a reference position.
   A stator (31) having a magnetic pole (35) facing the field magnetic pole and a multi-phase stator coil (33), and
   A generator motor for an internal combustion engine including a single sensor (38) that detects the field magnetic pole and the reference magnetic pole and generates a sensor signal.
2. The rotor is a generator motor for an internal combustion engine according to claim 1, which is directly connected to the internal combustion engine (12).
3. The rotor includes a permanent magnet (23) having a plurality of the field magnetic poles and the reference magnetic poles.
   The generator motor for an internal combustion engine according to claim 1 or 2, wherein the reference magnetic pole is formed within the range of one field magnetic pole.
4. The generator motor for an internal combustion engine according to claim 3, wherein the polarity of one magnetic magnetic pole appears on both sides or one side of the reference magnetic pole in the circumferential direction.
5. The generator motor for an internal combustion engine according to claim 3 or 4, wherein the field magnetic pole and the reference magnetic pole are formed on a radial inner surface facing the stator or an axial end surface.
6. The sensor signal includes a plurality of pulses (T1, T2, T3) having the same period due to the reference magnetic pole, or a plurality of pulses (T1, T2, T3) having different periods due to the reference magnetic pole. , T4, T26). The generator motor for an internal combustion engine according to any one of claims 3 to 5.
7. Further, an ignition control unit (61) that detects the reference position based on the sensor signal (SG) and controls the ignition of the internal combustion engine, and
   Claim 1 includes an electric circuit (11) including an electric motor control unit (62, 63, 64, 65) that rotates the rotor as a motor by controlling energization of the stator coil based on the sensor signal. The generator motor for an internal combustion engine according to any one of claims 6.
8. The electric motor control unit
   A start switch (62) that generates a start command for the internal combustion engine, and
   Upon receiving a start command from the start switch, a standby position control unit (66) that rotates the rotor so as not to exceed the maximum value of the cranking torque (FWTQ, RVTQ) of the internal combustion engine, and
   A rotation direction information acquisition unit (67) that acquires an energization pattern for rotating the rotor in the positive direction during a period in which the rotor rotates by the standby position control unit.
   Based on the energization pattern specified by the rotation direction information acquisition unit, a synchronous commutation control unit (68) that commutates the multiphase power supplied to the stator coil by closed loop control according to the sensor signal is provided. The generator motor for an internal combustion engine according to claim 7.
9. The rotation direction information acquisition unit
   The rotor is specified as an energization pattern for rotating the energization pattern opposite to the energization pattern controlled toward the standby range (STBY) in the forward direction, or
   A positive direction based on a rotation direction determined based on two pulse periods (T1, T2, T3, T4, T26) having different periods generated due to the reference magnetic pole, and an energization pattern at that time. The generator motor for an internal combustion engine according to claim 8, wherein the energization pattern for rotating the motor is specified.
10. The stator coil is a three-phase coil.
    The standby position control unit rotates the rotor by energizing 120 degrees.
    The generator motor for an internal combustion engine according to claim 8 or 9, wherein the synchronous commutation control unit rotates the rotor by energizing 180 degrees.
    
    

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