JPH11341893A - Generator for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generator capable of controlling the driving torque and the output current of an on-vehicle generator so as to be a proper value, regardless of its temperature. SOLUTION: A temperature sensor 100 measures a temperature Te of a generator 1. A rotating field speed determining part 300 of an alternator ACG ECU3 determines a rotating field speed N2 generated in the three-phase field coil 11 of a rotor 1R, based on the engine parameter and the temperature Te of the generator 1, and notifies of this to the rotating field generating part 21 of a rotor exciting device 2. The rotating field generating part 21, based on the rotating field speed N2 transmitted from ACG ECU3 and various engine parameters, controls the phase, the amplitude, and the frequency of AC power supplied to respective field coils 11a, 11b, 11c of the rotor 1R, and electrically generates the rotating field of the notified rotating speed N2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine (hereinafter referred to as "internal combustion engine").
The present invention relates to a power generator for an internal combustion engine that converts rotational energy into electrical energy (in particular, an engine), and in particular, by electrically generating a rotating magnetic field in a rotor of the generator, thereby driving torque and output current of the generator. The present invention relates to a power generator for an internal combustion engine which can optimize the power.

More specifically, according to the present invention, the speed of the rotating magnetic field generated in the rotor is variably controlled according to the temperature of the generator, so that the driving torque and output current thereof can always be optimized. The present invention relates to a power generator for an internal combustion engine.

[0003]

2. Description of the Related Art An on-vehicle power generator includes an alternator (ACG) having a rotating shaft connected to an engine crankshaft via an alternator belt, and AC power generated by the alternator according to the engine speed is converted to DC power. It comprises a rectifier for conversion and a voltage regulator for controlling the voltage of DC power according to the battery voltage.

FIG. 13 is a schematic view showing the structure of a conventional alternator 50. A DC field coil 53 is wound around a rotor (rotor) 52 integrated with a rotating shaft, and a stator 54 (fixed). A three-phase armature coil 55 is wound around the armature.

Here, when the rotor 52 is rotated to generate an alternating magnetic field in an excited state in which a DC current is supplied from a battery to the DC field coil 53, the armature coil 55 of the stator 54 has a rotational speed of the rotor 52. AC power is generated at a frequency corresponding to. That is, the conventional alternator is a generator using a synchronous motor. The rotor 52
In some cases, a permanent magnet is provided instead of the DC field coil 53.

[0006]

In the above-mentioned prior art, when the temperature of the alternator decreases, the electric resistance of the multi-phase winding decreases and a large amount of exciting current flows. Therefore, as shown in FIG. Output current at low temperatures is higher than at high temperatures. Also, when the electric resistance of the multi-phase winding decreases and the output current increases, the torque (driving torque) required to rotate the alternator at the same speed by external force.
However, as shown in FIG. 15, the temperature is higher at low temperatures than at high temperatures.

As described above, since the output current and the driving torque of the alternator greatly depend on the environmental temperature, there are the following problems. (1) If the temperature of the engine is low, the clay of the engine oil will increase, and mechanical friction loss of the engine,
Since the operating state of the engine becomes unstable due to reasons such as a decrease in combustion efficiency, the smaller the load on the engine, the better. However, when the temperature is low immediately after the start of the engine, as described above, the drive torque of the alternator becomes large, resulting in an excessive engine load, and there is a problem that the starting stability and the idling stability are reduced. (2) At low temperatures, the output current of the alternator becomes larger than during normal operation after completion of warm-up. there were. (3) Since the alternator belt is hardened at low temperatures, if the drive torque of the alternator increases at low temperatures,
Not only is the life of the alternator belt shortened, but also belt squealing is caused and the merchantability is reduced. For this reason, there has been a problem that measures such as increasing the belt width in order to increase the durability of the alternator belt and increasing the size of the pulley accordingly are required.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to control the driving torque and output current of a vehicle-mounted generator to appropriate values regardless of the temperature. It is to provide a device.

[0009]

According to the present invention, there is provided a generator having a rotor having a multi-phase winding and a stator, wherein the rotor is rotated by transmitting the rotational motion of an internal combustion engine. And a rotating magnetic field generating means for generating a rotating magnetic field in the multi-phase winding of the rotor, wherein the temperature detecting means for detecting the temperature of the generator, and the rotating magnetic field generating means, Rotating magnetic field speed determining means for determining the speed of the rotating magnetic field generated in the multi-phase winding of the rotor as a function of the temperature of the generator.

[0010] The driving torque and output current of the generator can be expressed as a function of the relative rotation speed (relative rotation speed N) of the magnetic field generated by the rotor with respect to the stator coil. If the speed N2 of the rotating magnetic field electrically generated in the phase winding is controlled, it can be arbitrarily controlled regardless of the rotor speed N1. Therefore, if the rotating magnetic field speed N2 is controlled as a function of temperature,
The drive torque and output current of the generator, which undesirably change according to the temperature, can be controlled to the desired appropriate torque and current regardless of the temperature.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the operation of a rotating magnetic field generated in a rotor of an induction machine will be described. The substantial rotation speed of the induction machine can be represented by a relative rotation speed (hereinafter, referred to as a relative rotation speed) N of a magnetic field generated by the rotor with respect to the stator coil, and a field winding (polyphase) of the rotor. If the windings) generate a DC magnetic field instead of a rotating magnetic field, the relative rotation speed N matches the mechanical rotation speed of the rotor. On the other hand, when a rotating magnetic field is generated electrically in the multi-phase winding of the rotor, the mechanical rotation speed of the rotor (hereinafter, referred to as the rotor rotation speed) is set to N1, and the multi-phase winding of the rotor is set to N1. Assuming that the speed of the rotating magnetic field to be generated (hereinafter referred to as the rotating magnetic field speed) is N2, the relative rotation speed N is expressed by the following equation. N = N1 + N2 (1) That is, the relative rotational speed N of the magnetic field generated by the rotor of the induction machine with respect to the stator coil depends on the mechanical rotation direction of the rotor and the rotation direction of the rotating magnetic field generated by the multiphase winding of the rotor. If they match, the rotation speed becomes faster than the rotor rotation speed N1, and if the rotation direction is reversed, the rotation speed becomes lower than the rotor rotation speed N1. Therefore, if the induction machine is employed as a generator for a vehicle, no matter how the rotor rotation speed N1 changes in synchronization with the engine rotation speed, if the rotation magnetic field speed N2 is appropriately controlled in response thereto, Substantially, the relative rotation speed N can be arbitrarily controlled.

On the other hand, since the driving torque and the output current of the generator can be expressed as a function of the relative rotation speed N, if the relative rotation speed N can be arbitrarily controlled as described above, the driving torque and the output current can be controlled. The current can be arbitrarily controlled regardless of the rotor rotation speed N1.

As described above, according to the present invention, when the induction machine is used as a generator, its driving torque and output current are represented by a function of the relative rotation speed N of the magnetic field with respect to the stator. Focusing on the fact that if the speed N2 of the rotating magnetic field generated in the multi-phase winding of the rotor can be controlled, it can be controlled arbitrarily regardless of the rotor speed N1, and an induction machine is used as a generator to set the rotating magnetic field speed N2 to an arbitrary value. Thus, the drive torque and output current of the induction machine can be arbitrarily controlled regardless of the temperature.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an overall configuration of a vehicular power generating apparatus to which the present invention is applied. FIG. 2 is a cross-sectional view in a plane perpendicular to the rotation axis of the generator 1 as the generator shown in FIG. 1, and FIG. 3 is a partial cross-sectional view in a plane along the rotation axis. The generator 1 of the present invention includes a rotor 1
R and stator 1S each have a three-phase winding,
This is a so-called induction machine in which the phase field coil 11 and the three-phase armature coil 12 are formed.

2 and 3, the rotating shaft 13 of the generator 1 is connected to a crankshaft (both not shown) via a belt. A rotor 1R having a three-phase field coil 11 is coaxially fixed to the rotating shaft 13, and a stator 1S having a three-phase armature coil 12 is arranged around the rotor 1R. The rotating shaft 13 is rotatably supported by the housing 17 via a front bearing 15a and a rear bearing 15b. A pulley 14 is fixed to one end of the rotating shaft 13, and each field coil 11 (11 a to 11 c) of the rotor 1 </ b> R is fixed to the other end.
Slip rings 18a to 18c that are in contact with brushes 19a to 19c that supply an exciting current to the motor are formed.

In the generator 1 at the other end of the rotating shaft 13, a rotor excitation device 2, which will be described later, and an ACG / ECU
3, the switching control device 5 and the short-circuit device 8 are arranged side by side in the circumferential direction along the inside of the housing 17 on the same plane orthogonal to the rotating shaft 13. This facilitates the routing of the wiring between the devices, enables effective use of dead space, and suppresses an increase in the size of the generator.

In FIG. 1, the ACG ECU 3 executes the overall control of the power generation device based on engine parameters such as the engine speed notified from the engine ECU 4.

Temperature sensor 100 as temperature detecting means
Measures the temperature Te of the generator 1. The temperature of the generator 1 may be directly measured by a temperature-sensitive element such as a thermistor attached to the surface, or may be represented by another temperature such as a water temperature or an intake air temperature.
Further, it may be obtained indirectly based on the state of a part other than the generator 1, such as the operating state of the engine and the vehicle speed. As described above, if the temperature of the generator 1 is represented by another temperature or indirectly obtained based on the state of another part, it is not necessary to provide a dedicated temperature sensing element, so that the configuration can be simplified. .

Rotating magnetic field velocity determination unit 3 of ACG ECU 3
00 functions as rotating magnetic field speed determining means, and the rotor 1R
Of the rotating magnetic field generated in the three-phase field coil 11 of FIG.
Is determined based on engine parameters notified from the engine ECU 4, the temperature Te of the generator 1 detected by the temperature sensor 100, and the like, as will be described in detail later. Notice.

The rotating magnetic field generator 21 functions as a rotating magnetic field generator, and the rotating magnetic field speed determiner 3 of the ACG ECU 3
The rotational magnetic field speed N2 and the engine EC determined at 00
Based on various engine parameters and the like received from U4, each field coil 11a, 11b, 11
c, by controlling the phase, amplitude and frequency of the AC power supplied thereto, thereby electrically generating a rotating magnetic field having the notified rotation speed N2. The DC magnetic field generating unit 22 is selectively energized with the rotating magnetic field generating unit 21 and the field coil 1 of the rotor 1R.
DC power is supplied to 1a and 11b to generate a DC magnetic field.

The switching control device 5 communicates with the ACG ECU 3 to detect the operating state of the generator 1, and at the timing when the generator 1 functions as a generator, the output terminal of the generator 1 is connected to the contact of the output control device 7. Then, at the timing of functioning as an electric motor, each contact of the switching circuit 6 is controlled so as to be connected to the contact of the short circuit device 8. Note that a control method for causing the generator 1 to function as an electric motor is described in Japanese Patent Application No. 10-5 by the present applicant.
No. 4136, the description is omitted.

The output current A1 of the generator 1 is detected by the current sensor 10a, and the charge / discharge current A2 of the battery 9 is detected.
Is detected by the current sensor 10b, and both are ACG / EC
This is notified to the rotating magnetic field speed determination unit 300 of U3. The short-circuit device 8 is connected to each armature coil 12a, 12
The output terminals of b and 12c are short-circuited with or without a variable resistor.

In such a configuration, the rotating magnetic field generation unit 21 sends the rotating magnetic field speed N
When 2 is notified, the excitation timing of each phase of the three-phase field coil 11 is controlled to generate the rotating magnetic field at the speed N2 electrically. Each armature coil 12a, 12 of the stator 1S
The AC power output from b and 12c is converted into DC power by the output control device 7, a part of which is supplied to the current electric load, and the rest is charged in the battery 9. Generator 1
In some cases, at the timing when the power generator functions as a generator, a part of the output power of the generator 1 is supplied to the generator 1 via the rotating magnetic field generator 21 for self-excitation.

FIG. 4 is a functional block diagram of the first embodiment (300A) of the rotating magnetic field speed determining unit 300. In this embodiment, the driving torque of the generator 1 is controlled to an appropriate torque regardless of its temperature. There are provided various configurations for performing the operations.

The rotor rotation speed detecting means 301 detects the rotation speed N1 of the rotor 1R based on the engine rotation speed Ne and the pulley ratio notified from the engine ECU 4. The improper range determining means 302 uses the lower limit value NL and the upper limit value NH of the rotor rotational speed N1 such that the driving torque of the generator 1 exceeds the predetermined upper limit torque TLMT, and the temperature Te and the output current A1 of the generator 1 as parameters. Stored data tables 302a, 30
2b.

FIG. 5 shows each data table 302a, 30
FIG. 2B is a diagram schematically showing the storage contents of the data generator 2b.
Lower limit NL0 at 30 ° C, lower limit NL30 at 30 ° C,
Similarly, the lower limit value NL60 at 60 ° C. is stored. Similarly, the data table 302b stores the upper limit value NH0 when the temperature of the generator 1 is 0 ° C., the upper limit value NH30 when the temperature of the generator 1 is 30 ° C., and 60 ° C. Is stored. Since the relationship between the rotor rotation speed N1 and the driving torque T depends on the output current of the generator 1 as shown in FIG. 12, it is not shown, but the generator temperature and the upper and lower limit values NL and NH are not shown. Is also stored for each output current.

The improper range determining means 302 determines the lower limit value corresponding to the temperature Te of the generator 1 detected directly or indirectly by the temperature sensor 100 and the output current A1 of the generator 1 detected by the current sensor 10a. NL and the upper limit NH are set to the rotor rotational speed N1.
Is output as an inappropriate range. The upper limit torque TLMT
Is set, for example, to the maximum torque at the maximum temperature that the generator 1 can reach under the environment where the engine is normally operating.

The charge amount detecting means 304 detects the current charge amount C of the battery 9. The charge amount C of the battery 9 can be detected based on, for example, the terminal voltage of the battery 9, the specific gravity of the electrolytic solution, or the history information of the charge / discharge amount. In the present embodiment, the battery 9 is controlled by the current sensor 10b.
The current charge amount C is obtained by detecting the charging / discharging current A2 of the above and integrating the charging / discharging current A2 per unit time.

When the detected current rotor speed N1 is within the inappropriate range (NL <N1 <NH), the rotating magnetic field speed calculating means 303 determines the relative rotation of the magnetic field generated by the rotor 1R with respect to the stator coil. A rotating magnetic field speed ± N2 for keeping the speed N out of the inappropriate range is determined.

Next, the flowchart of FIG.
4 will be described in detail with reference to the torque curve of FIG.

In step S1 of FIG. 6, the engine speed Ne is input to the rotor speed detecting means 301. In step S2, the mechanical speed of the generator 1, that is, the rotor speed is determined based on the engine speed Ne and the pulley ratio. The rotation speed N1 is measured and the rotation magnetic field speed calculation means 303
Output to In step S3, the temperature Te of the generator 1 is measured directly or indirectly by the temperature sensor 100. In step S4, the generator 1
The current output current A1 is measured.

The measured temperature Te and output current A
When 1 is input to the inappropriate range determining means 302, in steps S5 and S6, the inappropriate range determining means 302
And each data table 302 based on the output current A1
a, 302b, and the generator 1 selects and outputs the lower limit value NL and the upper limit value NH of the rotor rotational speed exceeding a predetermined upper limit torque TLMT.

In step S7, the rotating magnetic field speed calculating means 303 compares the rotor rotating speed N1 with the lower limit value NL and the upper limit value NH, and as shown in FIG. If the driving torque T exceeds the upper limit torque TLMT,
The process proceeds to step S8 to generate a rotating magnetic field. In step S8, it is determined whether the charge amount C of the battery 9 is sufficient based on the detection result by the charge amount detection unit 304.

Here, as described with reference to FIG. 14, the output current A1 of the generator 1 increases with an increase in the relative rotation speed N. Therefore, in the present embodiment, the charge amount of the battery is reduced in step S6. If it is determined that the rotational speed is insufficient, in step S9, the rotational magnetic field speed (+ N2) for increasing the relative rotational speed N and decreasing the drive torque T is used.
Is calculated by the rotating magnetic field velocity calculating means 303.
More specifically, as shown in FIG. 7, the relative rotational speed N is set to the upper limit value N corresponding to the upper limit torque TLMT.
The rotation magnetic field speed + N2 (= NH -N1) for making H is calculated.

On the other hand, if it is determined that the battery charge is sufficient, in step S10, a rotating magnetic field speed for reducing the driving torque T by reducing the relative rotation speed N is calculated. That is, the rotating magnetic field speed -N2 for setting the relative rotation speed N to the lower limit value NL corresponding to the upper limit torque TLMT.
(= N1 -NL) is calculated. In step S11,
The calculated rotating magnetic field speed ± N2 is equal to the value of the rotating magnetic field generator 2.
1, and a rotating magnetic field of speed ± N2 is induced in the multiphase winding of the rotor 1R.

After generating the rotating magnetic field at the speed N2, the actual torque of the generator 1 is measured by appropriate means, and the measured result is compared with the upper limit torque TLMT to perform feedback control of the rotating magnetic field speed N2. You may do it.

As described above, according to this embodiment, the drive torque of the generator 1 is controlled so as not to always exceed the drive torque at the time of high temperature (during normal operation after warm-up operation) regardless of the temperature. Since the alternator belt specification can be designed according to the frequently used normal operation, excessive quality can be prevented.

Further, according to the present embodiment, the rise of the driving torque at the time of low temperature of the generator 1 can be suppressed.
Improves the starting stability and idling stability of the engine. Further, since a large load is not applied to the alternator belt that has been hardened by the temperature drop, it is possible to prevent the life from shortening and the occurrence of belt squeal.

Further, according to the present embodiment, the rotor 1R
Is determined based on the amount of charge of the battery, so that insufficient charge or overcharge of the battery can be prevented.

FIG. 8 is a functional block diagram of the second embodiment (300B) of the rotating magnetic field velocity determining unit 300. In this embodiment, the output current A1 of the generator 1 is set to the upper limit value regardless of the temperature Te. Various configurations for controlling are provided below.

The rotor rotation speed means 311 determines the rotation speed N of the rotor based on the engine speed Ne and the pulley ratio.
1 is detected. The critical speed determining means 312 is provided with a data table 312a in which the relationship between the critical value NLMT of the rotor rotational speed N1 at which the output current A1 of the generator 1 exceeds the upper limit ALMT and the temperature Te of the generator 1 is registered.
FIG. 9 is a diagram schematically showing the contents stored in the data table 312a. For each temperature Te of the generator 1, a critical value NLMT of the rotor speed N1 at which the output current A1 exceeds the upper limit value ALMT is registered. I have.

The critical speed determining means 312 generates a data table 312 based on the temperature Te of the generator 1 detected directly or indirectly by the temperature sensor 100.
a, and determines and outputs the critical value NLMT of the rotor speed N1 at the current temperature.

The rotating magnetic field speed calculating means 313 compares the current rotor speed N1 with the critical value NLMT, and if the rotor speed N1 exceeds the critical value NLMT, the magnetic field generated by the rotor is applied to the stator coil. The rotating magnetic field speed for controlling the relative rotation speed N to the critical value NLMT-
Calculate N2.

Next, the operation of FIG. 8 will be described in detail with reference to the flowchart of FIG. 10 and the output current curve of FIG.

In step S21 of FIG. 10, the temperature Te of the generator 1 is measured directly or indirectly by the temperature sensor 100. In step S22, the measured temperature Te is compared with the reference temperature Tref, and the temperature Te is determined.
If the temperature exceeds the reference temperature Tref, the process is terminated,
If it is lower, the process proceeds to step S23.

In step S23, the engine speed Ne is input to the rotor speed detector 311. In step S24, the rotor rotation speed N1 of the generator 1 is measured based on the engine rotation speed Ne and the pulley ratio, and output to the rotating magnetic field speed calculation means 313.

In step S25, the critical speed determining means 3
12 is a data table 312 based on the temperature Te.
a, and outputs the critical value NLMT of the rotor rotational speed N1 at the temperature Te to the rotating magnetic field speed calculating means 313.

In step S26, the rotating magnetic field speed calculating means 313 determines the current rotor speed N1 and the critical value NLM.
T, and as shown in FIG. 11, if the rotor rotation speed N1 exceeds the critical value NLMT, the difference (NLMT)
-N1) is output as the rotating magnetic field speed N2 (-N2).

In step S28, the calculated rotating magnetic field speed -N2 is notified to the rotating magnetic field generator 21, and a rotating magnetic field of speed -N2 is induced in the multi-phase winding of the rotor 1R.
The relative rotational speed N is reduced.

As described above, according to the present embodiment, the output current of the generator 1 is controlled so as not to always exceed the output current at high temperatures (during normal operation after warm-up operation) regardless of the temperature. Since the rating of the wiring, the harness, and the like can be designed according to the normal operation in which the frequency of use is high, excessive quality of the wiring, the harness, and the like can be prevented.

In each of the embodiments described above, an induction machine constituted by a rotor and a stator having three-phase windings as multi-phase windings has been described as an example. However, the present invention is not limited to this, and the present invention is not limited thereto. The same applies to the case where other multi-phase windings such as a five-phase winding, a five-phase winding, etc. are employed.

[0052]

According to the present invention, the following effects are achieved. (1) The driving torque and the output current of the generator can be expressed as a function of the relative rotation speed (relative rotation speed) N of the magnetic field generated by the rotor with respect to the stator coil. If the speed N2 of the rotating magnetic field electrically generated in the phase winding is controlled, it can be controlled arbitrarily regardless of the rotor speed N1. Therefore, according to the first aspect, the drive torque and the output current of the generator, which undesirably change according to the temperature, can be controlled to the desired appropriate torque and appropriate current regardless of the temperature. (2) According to the second aspect, the driving torque of the generator is always suppressed to a predetermined upper limit torque or less irrespective of the temperature, so that it is possible to prevent the alternator belt from having excessive quality, shortening of service life and occurrence of belt squeal and the like. Become like

Further, since the rise of the driving torque at the time of low temperature is suppressed, the starting stability and the idling stability of the engine are improved. (3) According to the third aspect, the range of the rotor rotational speed exceeding the upper limit torque is given as an inappropriate range, so that the drive torque of the generator is set to be equal to or less than the upper limit torque without directly measuring the drive torque of the generator. Can be suppressed.

Further, the inappropriate range of the rotor rotation speed is
Since the output torque is given as a function of not only the temperature of the generator but also the output current, the driving torque of the generator can be suppressed to the upper limit torque or less irrespective of fluctuations in the addition of electricity. (4) According to the fourth aspect, the speed of the rotating magnetic field generated in the rotor is determined based on the charge amount of the battery, so that insufficient charging or overcharging of the battery can be prevented. (5) According to the fifth aspect, the output current of the generator is always suppressed to a predetermined value or less irrespective of its temperature, so that excessive quality of the wiring, the coupler and the like can be prevented. (6) According to claim 6, since the critical value of the rotor rotational speed at which the output current exceeds the upper limit is given, the output current of the generator can be suppressed to the upper limit or less without directly measuring the output current. .

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a vehicle power generation device of the present invention.

FIG. 2 is a sectional view showing a configuration of a generator according to the present invention.

FIG. 3 is a sectional view showing a configuration of a generator according to the present invention.

FIG. 4 is a functional block diagram of a rotating magnetic field speed determining unit 300A according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a rotor rotation speed and a driving torque using temperature as a parameter.

FIG. 6 is a flowchart showing the operation of the first embodiment of the present invention.

FIG. 7 is a diagram illustrating a method for determining a rotating magnetic field velocity in the second embodiment.

FIG. 8 is a functional block diagram of a rotating magnetic field speed determining unit 300B according to a second embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between the temperature of the generator and a critical value NLMT of the rotor rotation speed N1.

FIG. 10 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 11 is a diagram illustrating a method for determining a rotating magnetic field velocity in the second embodiment.

FIG. 12 is a diagram showing a relationship between a rotation speed of a generator and a driving torque using output current as a parameter.

FIG. 13 is a diagram showing a configuration of a main part of a conventional technique.

FIG. 14 is a diagram showing the relationship between the rotation speed of the alternator and the output current using temperature as a parameter.

FIG. 15 is a diagram showing the relationship between the rotation speed of the alternator and the driving torque using temperature as a parameter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Generator, 1R ... Rotor, 1S ... Stator, 2
... Rotor excitation device, 3 ... ACG / ECU, 4 ... Engine ECU, 5 ... Switch control device, 7 ... Output control device, 8 ... Short circuit device, 9 ... Battery, 11 ... Three-phase field coil, 12 ...
Three-phase armature coil, 13: rotating shaft, 14: pulley, 1
5a: front bearing, 15b: rear bearing,
17 ... housing, 18a-18c ... slip ring,
19a-19c ... brush

Claims (6)

[Claims] A generator (1) comprising a rotor (1R) having a multi-phase winding and a stator (1S), wherein the generator is rotated by transmitting the rotational motion of an internal combustion engine; and a multi-phase winding of the rotor. A rotating magnetic field generating means (21) for generating a rotating magnetic field in a line, wherein the temperature detecting means (100) for detecting the temperature of the generator; and the rotating magnetic field generating means (21). For determining the speed (N2) of the rotating magnetic field generated in the multi-phase winding of the rotor as a function of the temperature of the generator (300). Power generator. 2. The rotating magnetic field speed determining means (300A) determines the rotating magnetic field speed (N2) such that the driving torque of the generator does not exceed a predetermined upper limit torque. The power generator for an internal combustion engine according to claim 1. 3. The rotating magnetic field speed determining means (300A) includes a rotor rotating speed detecting means (301) for detecting a rotating speed (N1) of the rotor, and a rotor rotating speed at which a driving torque of a generator exceeds the upper limit torque. Means for determining an inappropriate range of (N1) as a function of the temperature and output current of the generator (302)
And a rotating magnetic field for obtaining a rotating magnetic field speed (N2) based on the detected rotor rotating speed (N1) such that a relative rotating speed (N) of the magnetic field generated by the rotor with respect to the stator coil is out of the inappropriate range. The power generator for an internal combustion engine according to claim 2, further comprising speed calculation means (303). 4. It further comprises a charge amount detecting means (304) for detecting a charge amount of a battery (9) as a power supply, wherein said rotating magnetic field speed calculating means (303) has an insufficient charge amount of the battery. And a rotational magnetic field speed for increasing the relative rotational speed (N) to reduce the driving torque. When the charged amount of the battery is sufficient, reducing the relative rotational speed (N) to reduce the driving torque is performed. The power generator for an internal combustion engine according to any one of claims 2 to 4, wherein a rotating magnetic field speed is obtained. 5. The rotating magnetic field speed determining means (300B) determines the rotating magnetic field speed so that the output current of the generator does not exceed a predetermined upper limit regardless of the temperature. Item 2. A power generator for an internal combustion engine according to Item 1. 6. The rotating magnetic field speed determining means (300B) includes: a rotor rotating speed detecting means (3) for detecting a rotating speed of a rotor.
11), and the rotor rotation speed at which the output current of the generator reaches the upper limit.
A critical speed determining means (312) for determining a critical value of (N1) as a function of the temperature of the generator; and a rotating speed (N) of a magnetic field generated by the rotor with respect to the stator coil does not exceed the critical value. 6. A power generator for an internal combustion engine according to claim 5, further comprising: a rotating magnetic field speed calculating means (313) for obtaining a rotating magnetic field speed (N2) based on the detected rotor rotating speed.