JPH0438131A - Ac generator for vehicle - Google Patents

Abstract

PURPOSE:To improve generation efficiency, productivity and maintainability by a constitution wherein a control means controls each regulator based on the generating state of each generator detected through a generating state detecting means so that the output voltage from each generator is regulated. CONSTITUTION:When the generating power of a first generator is higher than that of a second generator, an electromotive force corresponding to the differential output current is induced in a coil 11 and then it is converted into a predetermined voltage level which is further converted into an absolute value and fed to the noninverted input terminal of a comparator 14. The comparator 14 outputs a control signal based on that voltage and a sawtooth voltage. The control signal causes a transistor 21 to turn OFF while a transistor 23 to turn ON thus conducting the exciting coil 17 of the second generator. When the transistor 21 is turned OFF, the transistor 22 is turned ON while the transistor 23 is turned OFF thus bringing the exciting coil 17 into nonconducting state.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an alternating current generator installed in a vehicle.

[Conventional technology]

In recent years, the electrical loads mounted on vehicles have been gradually increasing, and power generation devices equipped with a plurality of generators have been proposed to cover the power consumed by these loads. This power generation device not only increases the total amount of power generated, but also
Since the load borne by each generator is reduced, the advantage is that power generation efficiency is improved. however,
Since it is not possible to completely equalize the amount of adjustment made by the regulators of each generator, the amount of power generated is largely biased toward one generator, making it impossible to fully obtain the above-mentioned advantage of improved power generation efficiency.

Therefore, as in the power generation device described in U.S. Pat. A device that is controlled by a control circuit has been proposed.

[Problem to be solved by the invention] However, the power generation device described in the above-mentioned publication has two problems.
The two generators have different structures; one generator is a general type whose output current is regulated by a regulator, and the other generator is a special type that is controlled by a control circuit. Therefore, there is no compatibility between the two electric generators at all, and both generators must be kept in stock in case of production or failure, which is expected to cause problems in terms of productivity and maintainability.

An object of the present invention is to provide a vehicle alternating current power generation system that can improve power generation efficiency by equalizing the load factor of each generator, and that can improve productivity and maintainability by unifying the structure of each generator. The goal is to provide equipment.

[Means to solve the problem]

The present invention provides a plurality of generators mounted on a vehicle, a plurality of regulators that respectively control the generated voltage of each of the generators, a power generation state detection means for detecting a power generation state of each of the generators, and a power generation state of the power generation state. The gist of the present invention is an AC generator for a vehicle, comprising a control means for controlling each regulator so that the load factors of the respective generators are equal to each other based on the detection result of the detection means.

[Effect]

The control means controls each regulator based on the power generation state of each generator detected by the power generation state detection means.

Therefore, the error in the regulated voltage of each regulator is corrected, and the load factors of each generator are equalized.

In addition, since the output voltage of each generator is adjusted by a regulator and the basic structure is the same,
Compatible.

〔Example〕

An embodiment embodying the present invention will be described below with reference to the drawings.

FIG. 1 is an electrical circuit diagram of the alternating current generator of this embodiment.

In the figure, 1a is the first generator, 1b is the second generator, 2a
2b is a first regulator that adjusts the output voltage of the first generator 1a, and 2b is a second regulator that adjusts the output voltage of the second generator 2a. In this example, the first
The rated outputs of the second generators 1a and lb are set to be equal. Further, in the figure, 3 is an electrical load such as a headlight mounted on the vehicle, 4 is the first and second generator la,
5 is an ignition switch of the vehicle, and 6 is an on-vehicle battery that is charged by lb.
and a power generation bias detection section serving as a power generation state detection means that inputs the output currents of the second generators 1a and 1b and detects the bias in the output currents. Furthermore, 8 inputs the detection signal of the power generation bias detection section 6 via the signal line 9, and the signal lines 10a, 1
0b to the first and second regulators 2a.

2b is an output current control section serving as a control means for outputting a control signal to the terminal 2b.

FIG. 2 shows the first and second regulators 2a.

2b is an electric circuit diagram showing details of the power generation bias detection section 6 and the output current control section 8. In the figure, reference numeral 11 denotes a coil, and the output wires 7a are arranged so that the directions of currents are opposite to each other.
, 7b. When output currents of different magnitudes are passed from the first and second generators 1a, lb to the Okayama force lines 7a, 7b, the coil 11 has a magnitude and direction corresponding to the difference between the output currents. An induced electromotive voltage is generated. Further, lla is a converter, which converts the induced electromotive voltage of the coil 11 into a signal of a predetermined voltage level.

Further, in FIG. 2, 12 is an absolute value converter that converts the detection signal input from the power generation bias detection section 6 through the signal line 9 into an absolute value, 13 is a sawtooth wave generator that outputs a sawtooth wave, 14 is a comparator, and absolute value converter 1
The signal from the sawtooth wave generator 13 is input to the non-inverting input terminal, and the sawtooth wave from the sawtooth wave generator 13 is input to the inverting input terminal.

Further, reference numeral 15 denotes a positive/negative determining device, which determines whether the detection signal inputted from the power generation bias detection section 6 via the signal line 9 is positive or negative.

Reference numeral 16 denotes a switching circuit which transfers the control signal of the comparator 14 to the signal line 10a according to the judgment result of the positive/negative judger 15.
, 10b.

Furthermore, in FIG. 2, I7 is the generator 1a.

ib excitation coil, I8 is flywheel diode,
19 is a terminal connected to the ignition switch 5;
20 is a terminal for detecting the generated voltage of the generators 1a and 1b. Further, 21 is a signal line 10a.

10b, a transistor driven by the control signal of the comparator 14; 22.23, a transistor for controlling the excitation current of the excitation coil 17; 24, a Zener diode for controlling the transistor 22.23;
25 to 27 are resistors.

Next, the operation of the vehicle alternating current generator configured as described above will be explained.

The output voltages of the first and second generators 1a, lb are adjusted by respective regulators 2a, 2b. That is,
When the output voltage of each generator 1a, lb is below a predetermined value, the Zener diode 24 does not conduct, so the transistor 2
2 is kept off. Therefore, the transistor 23 is turned on, energizing the excitation coil 17, and the output voltage is increased.

Furthermore, when the output voltage of each generator 1a, lb exceeds a predetermined value, the Zener diode 24 becomes conductive, so the transistor 22
turns on. Therefore, the transistor 23 is turned off, the excitation coil 17 is de-energized, and the output voltage is reduced.

The above is exactly the same as the output adjustment of a general generator.

Now, suppose that the amount of power generated by the first generator 1a is the same as that of the second generator 1b.
If it is larger, the output line 7a on the first generator la side
A larger output current is applied. Therefore, an induced electromotive voltage is generated in the coil 11 of the power generation bias detection unit 6 with a magnitude and direction corresponding to the difference between these output currents, and the induced electromotive voltage is converted to a predetermined voltage level by the converter lla. It is input to the absolute value converter 12 of the output current control section 8. The input voltage is converted to an absolute value by an absolute value converter 12,
It is input to the non-inverting input terminal of the comparator 14. The comparator 14 converts the absolute value converter 1 based on the voltage input to the non-inverting input terminal and the sawtooth wave voltage input from the sawtooth wave generator 13 to the inverting input terminal.
A control signal with a duty ratio proportional to the input voltage from 2 is output.

Further, the voltage from the coil 11 is input to a positive/negative determiner 15 to determine whether it is positive or negative, and a switching circuit 16 is applied according to the determination result.
The control signal of the comparator 14 is connected to the signal lines 10a, 1
Selectively output to either 0b. In this case, the first
Since the power generation amount of the generator 1a is larger, the signal line 10
A control signal is output to the b side, and this control signal causes the second
The transistor 21 of the regulator 2b is turned on and off. When this transistor 21 is turned on, the transistor 22 is turned off and the transistor 23 is turned on, so that the excitation coil 1 of the second generator 1b is turned on.
7 is energized. Further, when the transistor 21 is turned off, the transistor 22 is turned on, and the transistor 23 is turned off, so that the excitation coil 17 is de-energized. Therefore, the energization rate of the excitation coil 1'''l is proportional to the duty ratio of the control signal from the comparator 14, and as a result, the amount of power generated by the second generator 1b is increased, and the amount of power generated by the first generator 1a is increased. Adjusted equal to the amount.

Then, when the power generation amounts of both valve electric machines 1a and lb become equal,
The induced electromotive force generated in the coil 11 of the power generation bias detection section 6 disappears, the duty ratio of the control signal output from the comparator 14 becomes 0%, and the transistor 21 is no longer turned on, so that the second generator 1b The excitation coil 17 is no longer energized.

Note that, contrary to the above, when the power generation amount of the second generator 1b is larger than that of the first generator 1a, the polarity of the induced electromotive force generated in the coil 11 of the power generation bias detection section 6 is reversed, The control signal of the comparator 14 is inputted to the first regulator 2a by the switching circuit 16, and the amount of power generated by the first generator 1a is increased.

In this way, the vehicle alternating current generator of this embodiment has the first and second generators 1a and 1b mounted on the vehicle, and the first and second generators that respectively control the generated voltages of both valve electric machines 1a and Ib.
regulators 2a, 2b, and both valve electric machines 2a, 2b.
and a power generation bias detection section 6 that detects the output current of the two valve electric machines 1a, 1 based on the detection result of the power generation bias detection section 6.
Each regulator 2 is adjusted so that the amount of power generated by
a, 2b.

Therefore, both valve electric machines 1a detected by the power generation bias detection unit 6,
Based on the output current of lb, the output current control section 8 controls the regulated voltages of the regulators 2a and 2b.

Therefore, errors in the adjustment voltages of both curators 2a and 2b are corrected, and the power generation amounts of the respective generators 1a and 1b are equalized. As a result, the load borne by the individual generators la and lb is reduced, and power generation efficiency can be improved.

Also, both electric machines 1a and lb are regulators 2a and 2b.
Since the output voltage is adjusted by the two and the basic structure is the same, they are compatible. Therefore, it is only necessary to keep one type of generator in stock in case of production or failure, and the productivity and maintainability of the power generator can be improved.

Note that the present invention is not limited to the above embodiment, and for example, although the power generating apparatus of the above embodiment was equipped with two generators 1a and 1b with the same rated output, it may be equipped with generators with different rated outputs. It may be embodied in a power generation device. The power generation bias detection section 6 in this case is configured as shown in FIG. That is, in addition to the coil 11, a coil 31 surrounding the output lines 7a and 7b arranged so that the current direction is the same is added, and the total amount of power generation of both electric machines is detected by the coil 31. do. Then, the load factor (the ratio of the current output to the rated output) of both all electric machines is determined based on the sum and difference of the amount of power generation detected in both coils 11.31, and the load factors of both all electric machines are equal to each other. The output current control unit 8 may control the output current so that In addition, even in this configuration, the two all-electric machines differ only in their rated output, but the basic structure in which the output voltage is adjusted by the regulator is the same, so
It is possible to use a generator with a large rated output instead of a generator with a small rated output and has compatibility.

Further, in the above embodiment, the output currents of both electric machines 1a and lb are detected by the coil 11, and the generator 1 is detected based on the output current.
Alternatively, the power generation states of the generators 1a and 1b may be determined based on the excitation current flowing through the excitation coil 17.

〔Effect of the invention〕

As described in detail above, according to the vehicle alternating current generator of the present invention, it is possible to equalize the load factor of each generator to improve power generation efficiency, and to unify the structure of each generator to improve productivity. This has the excellent effect of improving maintainability.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of the AC generator of the example, Figure 2 is an electric circuit diagram showing details of the regulator, power generation bias detection unit, and output current control unit, and Figure 3 is a case where the rated output of the generator is different. FIG. 3 is an electric circuit diagram showing details of a power generation bias detection section of FIG. 1a is the first generator, lb is the second generator, 2a is the first generator
2b is a second regulator, 6 is a power generation bias detection section as a power generation state detection means, and 8 is an output current control section as a control means. Patent applicant Nippondenso Co., Ltd.

Claims (1)

[Claims] 1. A plurality of generators mounted on a vehicle, a plurality of regulators that respectively control the generated voltage of each of the generators, and a power generation state detection means that detects the power generation state of each of the generators. An alternating current generator for a vehicle, comprising: control means for controlling each regulator so that the load factors of each of the generators are equal to each other based on the detection result of the power generation state detection means.