JP3323269B2 - Alternator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternator control device, and more particularly to an alternator control device for monitoring the output voltage of an alternator to stop or warn the power generation.

[0002]

2. Description of the Related Art Generally, an alternator of this type is a kind of three-phase AC generator, and rectifies a voltage alternately generated in each of U, V and W phase coil portions of a stator coil by an output diode to rectify the battery. And the current supplied to the field coil to the alternator is controlled so that the voltage supplied to the battery is constant, thereby controlling the alternator output voltage.

As a control device for protecting the alternator, a conventional control device is disclosed, for example, in Japanese Patent Laid-Open No. 55-15 / 55.
As shown in the publication 7942 and the like, the output voltage of the alternator is detected, and when the voltage rises above a set value,
There is known one in which power generation by an alternator is stopped.

[0004] In addition, there is another known type in which when the alternator output voltage rises above a set value, instead of stopping the power generation, a power generation abnormality lamp is turned on to issue an alarm.

[0005]

When the output voltage of the alternator is detected in this manner, the current generated by the alternator is a three-phase alternating current. Rectification is performed by three diodes (triodes).

However, using a diode separately from the output diode has a problem in terms of cost.

If the three diodes for monitoring are eliminated and the voltage of the one-phase coil portion of the three-phase coil portion of the stator coil in the alternator is detected as the output voltage, the other two-phase coil portions can be detected. Since the alternator output voltage becomes 0 while the voltage is generated, the overvoltage protection function may not work.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide an alternator output voltage that is not affected by the variation of the voltage of the one-phase coil portion of the alternator. An object of the present invention is to reduce costs by making it possible to detect well.

[0009]

In order to achieve this object, according to the first aspect of the present invention, after maintaining a voltage of a one-phase coil portion of a stator coil in an alternator for a predetermined time,
The voltage was gradually reduced, and this was used as the alternator output voltage.

More specifically, as shown in FIG. 1, the present invention includes a control means 21 for stopping power generation of the alternator 1 or at least one of an alarm when the output voltage of the alternator 1 rises above a set voltage. The alternator control device is premised.

Further, a voltage holding means 20 is provided which holds the voltage of the one-phase coil portion 3 of the stator coil of the stator coil 5 of the alternator 1 for a predetermined time and then gradually reduces the voltage to become the alternator output voltage. Also,
Maximum value detecting means 23 for detecting the maximum value of the voltage of the one-phase coil portion 3 of the stator coil in the alternator 1, and a value relating to the average value of the maximum value and the minimum value of the voltage of the one-phase coil portion 3 of the stator coil And an average value detecting means 24 for detecting the maximum value detecting means 2.
Performs power generation stop of the alternator 1 when the maximum value of the voltage of one phase coil portions of the detected stator coil rises above the maximum value set voltage by 3, the stator coil which is detected by the average value detecting unit 24 one An alarm is issued when a value related to the average value of the voltage of the phase coil unit rises above the average value set voltage, while a value related to the average value is flat.
When the voltage is lower than the average setting voltage, the stator coil
Voltage of the single-phase coil section rises above the maximum voltage.
It is configured so that the above-mentioned alarm is not performed even in the state of being turned on.

According to the second aspect of the present invention, there is further provided a rotation detecting means 22 for detecting the number of rotations of the alternator 1 or a value related to the number of rotations, and the control means 21 controls the alternator detected by the rotation detecting means 22. The configuration is such that the set voltage is variable according to the rotation speed or a value related to the rotation speed.

According to the third aspect of the present invention, the voltage holding means 2
Reference numeral 0 denotes a diode that allows the voltage of the one-phase coil portion 3 of the stator coil of the alternator 1 to pass therethrough, and a capacitor and a resistor connected in series with the diode and in parallel with each other.

[0014]

According to the first aspect of the present invention, the voltage of the one-phase coil portion 3 of the stator coil in the alternator 1 is detected by the voltage holding means 20, and after the voltage is held for a predetermined time, gradually. Is reduced. This voltage is compared with the set voltage by the control means 21 as the alternator output voltage. When the alternator output voltage rises above the set voltage, at least one of the stop of the power generation of the alternator 1 and the alarm is performed, and the protection of the alternator 1 is performed. And so on. As described above, since the voltage of the one-phase coil portion 3 of the stator coil of the alternator 1 is gradually reduced after being maintained for a predetermined time, a generated voltage is generated in the other two-phase coil portions 2 and 4 of the stator coil of the alternator 1. During this operation, the voltage of the one-phase coil portion 3 of the stator coil is held, and the alternator output voltage does not become 0 but becomes a voltage value that maintains the voltage of the one-phase coil portion 3 of the stator coil. For this reason, the cost can be reduced by omitting the monitoring triode, and the output voltage of the alternator 1 can be detected.

Further, since the voltage of the one-phase coil portion 3 of the stator coil as the alternator output voltage gradually decreases after a predetermined time, if this voltage is held without decreasing, the actual one-phase coil The alternator output voltage does not remain unchanged even if the voltage of the unit changes, and the alternator output voltage can be changed to follow the actual generated voltage and detected accurately.

In the present invention, the maximum value of the voltage of the one-phase coil portion 3 of the stator coil in the alternator 1 is determined by the maximum value detecting means 23, and the maximum value and the minimum value of the voltage of the one-phase coil portion 3 of the stator coil are determined. Related to the average of
Are detected by the average value detecting means 24, and the control means 21 sets the alternator when the maximum value of the one-phase coil voltage of the stator coil detected by the maximum value detecting means 23 rises above the maximum value set voltage. 1 of the power generation stop is performed Rutotomoni, the average value of the voltage of one phase coil portions of the detected stator coil by the mean value detecting means 24
An alarm is issued when the related value rises above the average set voltage , and the value related to this average is
Lower, the one-phase coil part of the stator coil
Even when the maximum voltage of the
No alarm is given .

That is, the voltage of the one-phase coil portion 3 of the stator coil changes between the maximum value and the minimum value. Since this cycle changes in accordance with the rotation speed of the alternator 1, the voltage is related to the average value of both. By detecting such a value , the actual alternator output voltage can be accurately detected. Therefore, by comparing the value related to the average value with the average value setting voltage, the alarm can be performed accurately and stably.

At this time, the maximum value of the voltage of the one-phase coil portion of the stator coil accurately follows the actual change of the output voltage of the alternator 1, but the minimum value has poor followability, and the average value of these values is poor. value related to the poor response to a voltage change under the influence of the minimum value. For this reason, by comparing the maximum value with good responsiveness with the maximum value setting voltage, quick responsiveness can be obtained, and power generation that directly affects the protection of the alternator 1 can be stopped quickly.

According to the second aspect of the present invention, the rotation detecting means 22 detects the rotation speed of the alternator 1 or a value related to the rotation speed, and the control means 21 detects the detected rotation speed of the alternator or the rotation speed. The set voltage is changed according to the associated value. For this reason, even if the voltage cycle changes due to a change in the rotation speed of the alternator 1 and the maximum voltage of the one-phase coil portion 3 of the stator coil changes accordingly, it is necessary to set an appropriate set voltage according to the change. Thus, the rise of the alternator output voltage to the set voltage or more can be accurately determined irrespective of the change in the alternator rotation speed.

According to the third aspect of the present invention, the voltage of the one-phase coil portion 3 of the stator coil of the alternator 1 passes through the diode and is charged by the capacitor connected in parallel to the diode. The charging of this capacitor is controlled by the backflow by the diode, and the actual one-phase coil portion 3 of the stator coil is
Is maintained even when the voltage of the capacitor drops, and thereafter, the voltage of the capacitor is discharged at a predetermined decay rate by the resistor.
Accordingly, a specific configuration of the voltage holding unit 20 that reduces the voltage of the one-phase coil unit 3 of the stator coil in the alternator 1 after holding for a predetermined time can be easily obtained in hardware.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

First, a reference example will be described. FIG. 2 shows the entire configuration of the reference example, and 1 is an on-vehicle engine (not shown).
The alternator 1 includes a stator coil 5 composed of U, V, and W three-phase coil units 2 to 4, six diodes D1 to D6 bridge-connected to the stator coil 5, and an And a field coil 6 for flowing a magnetic current to magnetize a rotor (not shown). The field current to the field coil 6 is controlled to control the alternator output voltage.

Reference numeral 7 denotes a battery connected to an output terminal of the alternator 1 via a charging circuit 9 in which a main fuse 8 is arranged. Reference numeral 10 denotes a vehicle electric load connected to an output terminal of the alternator 1 via an ignition key switch 11. It is.

Reference numeral 12 denotes a power generation abnormality lamp connected in series to the vehicle electric load 10, reference numeral 13 denotes a main relay in which a solenoid 13a is connected in series to the vehicle electric load 10, and a switch 13b of the relay 13 serves as the battery. 7 is connected via a fuel fuse 14.

Reference numeral 18 denotes a control unit having a CPU 19 for controlling the output voltage of the alternator 1. The CPU 19 has a terminal 19a connected to the power generation abnormality lamp 12 via a transistor Tr1, and a switch section of the main relay 13. Terminal 19b connected to 13b
A transistor Tr3 that is turned ON by a transistor Tr2 that is turned ON by a signal from the terminal 19b;
And the battery 7 via the fuel fuse 14
And a terminal 19c for inputting the battery voltage Vs
And a terminal 19d connected to the crank angle sensor 15 for inputting a crank angle signal, and connected to, for example, the V-phase coil portion 3 of the stator coil 5 in the alternator 1;
A terminal 19e for inputting the V-phase coil voltage Vt and the field coil 6 of the alternator 1 are connected via a transistor Tr4 to a field coil excitation duty signal f.
A terminal 19f for controlling the field current by changing the duty is provided.

Further, the control unit 18 includes a voltage Vt of the V-phase coil unit 3 of the alternator 1.
(V-phase coil voltage), and a voltage holding circuit 20 including a capacitor C and a resistor R connected in series and in parallel with each other to the diode D is provided. After the voltage Vt of the V-phase coil section 3 of the alternator 1 is maintained for a predetermined time, the voltage Vt is gradually reduced to the alternator output voltage.

The CPU 1 of the control unit 18
In FIG. 9, the alternator output voltage control operation is performed as usual as shown in FIG. That is, first, in step Q1, the generated voltage of the V-phase coil unit 3 in the alternator 1, that is, the V-phase coil voltage Vt is input, and in step Q2, it is determined whether or not the V-phase coil voltage Vt is equal to or higher than the first set voltage A. . When this determination is NO at Vt <A, that is, when the V-phase coil voltage Vt is not overvoltage, normal regulation control is executed in steps Q3 to Q7. First, in step Q3, the battery voltage Vs
And in step Q4, the regulated voltage Vreg
Is set, it is determined in step Q5 whether the battery voltage Vs is higher than the regulation voltage Vreg.
When this determination is NO of Vs ≦ Vreg, in step Q6, the field coil excitation duty signal fduty of the alternator 1 is set to the increasing side of the field current, and
When s> Vreg is YES, in step Q7, the field coil excitation duty signal fduty is set to the decreasing side of the field current, and the process returns.

On the other hand, if the determination in step Q2 is Vt ≧ A
Is YES, it is considered that the V-phase coil voltage Vt has become an overvoltage, and steps Q8 to Q14 are executed. First, in step Q8, it is determined whether or not the V-phase coil voltage Vt is higher than a second set voltage B (> A) higher than the first set voltage A. This determination is NO for Vt ≦ B
In step Q9, the overvoltage alarm delay timer Covchag is set to Covchag = C in step Q9, and in step Q10, the overvoltage alarm flag Xgenlmp for turning on the power generation abnormality lamp 12 is set to Xgenl.
After clearing to mp = 0, the process proceeds to step Q14.

In step Q8, it is determined that Vt> B.
In the case of ES, the count of the overvoltage alarm delay timer Covchag is reduced in step Q11, and the overvoltage alarm delay timer Covchag is reduced in step Q12.
It is determined whether g has become Covchag = 0.
When the determination is NO, the overvoltage warning flag Xgenl is kept as it is.
After setting gen to Xgenlmp = 1, the process proceeds to step Q14. In step Q14, the field coil excitation duty signal fduty of the alternator 1 is set to fduty = 0 to forcibly stop the alternator 1 from generating power, and then the process returns.

In this reference example, the above steps Q2 and Q8
To Q14, the V-phase coil voltage Vt of the alternator 1 obtained through the voltage holding circuit 20 (the V-phase coil unit 3
The control means 21 is configured to stop the power generation of the alternator 1 and issue an alarm by turning on the power generation abnormality lamp 12 when the power supply voltage rises above the first set voltage A.

Therefore, in the above-mentioned reference example, a field current is supplied from the control unit 18 to the field coil 6 of the alternator 1 and the three-phase alternating current is applied to the stator coil 5 composed of the U, V, and W phase coil units 2 to 4. An output voltage is generated, and this output voltage is rectified to DC by six bridge-connected diodes D1 to D6, and then the charging circuit 9
Is supplied to the battery 7. Then, the control unit 18 monitors the V-phase coil voltage Vt of the V-phase coil unit 3 in the alternator 1. When the V-phase coil voltage Vt is lower than the first set voltage A, the battery voltage Vs is regulated. The field current is controlled so that the voltage becomes Vreg.

On the other hand, if the V-phase coil voltage Vt is equal to or higher than the first set voltage A, it is determined that the voltage is overvoltage, and if the V-phase coil voltage Vt is equal to or lower than the second set voltage B, When the V-phase coil voltage Vt is higher than the second set voltage B, the overvoltage delay timer Cov
After the completion of the counting of the chag, the power generation T of the alternator 1 is stopped. When the V-phase coil voltage Vt is higher than the second set voltage B, the power generation abnormality lamp 12 is turned on by setting the overvoltage alarm flag Xgenlmp to Xgenlmp = 1.

The V-phase coil section 3 of the alternator 1 has a diode D
As shown in FIG. 4A, the V-phase coil voltage Vt passes through the diode D and is connected in parallel to the diode D because the voltage is input through the voltage holding circuit 20 including the capacitor C and the resistor R. The charged capacitor C is charged. This charging of the capacitor C is maintained even if the actual V-phase coil voltage Vt of the V-phase coil unit 3 drops due to the backflow regulation of the diode D. Thereafter, the voltage of the capacitor C is discharged by the resistor R at a predetermined decay rate. . As described above, since the V-phase coil voltage Vt of the alternator 1 is gradually reduced after being held for a predetermined time, the voltage V
t becomes as shown in FIG. 4B, and the V-phase coil voltage Vt is held even while the coil voltage is generated in the other two-phase U-phase and W-phase coil units 2 and 4 of the alternator 1. , The output voltage of the alternator does not become 0 but becomes a voltage value that maintains the V-phase coil voltage Vt. For this reason, the cost can be reduced by omitting three conventional monitoring diodes, and the output voltage of the alternator 1 can be detected.

Further, since the V-phase coil voltage Vt as the alternator output voltage gradually decreases after a predetermined time, if the actual V-phase coil voltage Vt fluctuates when this voltage Vt is maintained without being reduced. The alternator output voltage that is input to the CPU 19 does not change, and the alternator output Vt can be accurately detected by changing the alternator output Vt following the actual V-phase coil voltage Vt.

Next, an embodiment of the present invention will be described.
5 to 8 show an embodiment of the present invention (note that FIGS.
The same reference numerals are given to the same parts as those described above, and a detailed description thereof is omitted.) In the above-described reference example, the voltage Vt of the V-phase coil unit 3 of the alternator 1 is maintained for a predetermined time and then gradually decreased. While the holding circuit 20 performs the processing in hardware, the processing is performed in software.

That is, in this embodiment, the voltage holding circuit 20 in the above-mentioned reference example is omitted, and the parts other than the CPU 19 of the control unit 18 are the same as the usual ones. It is configured to perform a control operation.

First, in step R1, the V of the alternator 1
The voltage of the phase coil unit 3, that is, the V-phase coil voltage Vt is input, and it is determined in step R2 whether or not the V-phase coil voltage Vt is larger than the maximum value Vtmx up to the previous sampling. When this determination is YES of Vt> Vtmx, the current V-phase coil voltage Vt is updated as the maximum value Vtmx in step R3, the maximum value hold timer Cvtmx is set to Cvtmx = D in step R4, and then the process proceeds to step R8. . Also, the determination in step R2 is Vt
If ≦ Vtmx is NO, then in step R5 V
Phase coil voltage Vt is the minimum value Vt up to the previous sampling
It is determined whether it is smaller than mn. This judgment is Vt
If <Vtmn is YES, the current V-phase coil voltage Vt is updated as the minimum value Vtmn in step R6, and the minimum value hold timer Cvtmn is updated in step R4 to Cvt.
After setting mn = D, the process proceeds to step R8. further,
When it is determined that Vt ≧ Vtmn is NO in step R5, the process proceeds to step R8.

In step R8, the V-phase coil voltage V
The average value of the maximum value Vtmx and the minimum value Vtmn of t is doubled to calculate the alternator power generation voltage Vth. afterwards,
In step R9, the power generation voltage Vth is set to a predetermined third setting.
It is determined whether the voltage is lower than the voltage B (the average value setting voltage). If this determination is YES of Vth <B, the overvoltage alarm delay timer Covchag is set to Covchag = C in step R10, the overvoltage alarm flag Xgenlmp is cleared to Xgenlmp = 0 in step R11, and the process proceeds to step R15. Step R9
Is NO in Vth ≧ B, step R12
Then, the count of the overvoltage alarm delay timer Covchag is decreased, and it is determined in step R13 whether or not the overvoltage alarm delay timer Covchag has become Covchag = 0. If this determination is NO, the overvoltage alarm flag Xge for lighting the power generation abnormality lamp 12 is kept as it is, and if YES, at step R14.
After setting ngenmp to Xgenlmp = 1, the process proceeds to step R15. In this step R15, based on the output signal from the crank angle sensor 15,
The engine speed Ne is input as a value related to the alternator speed, and in the next step R16, the overvoltage determination voltage Vtou is set based on the engine speed Ne from a preset map. The map is set such that the overvoltage determination voltage Vtou decreases as the engine speed Ne increases as shown in FIG.

Thereafter, in step R17, the above V
The maximum value Vtmx of the phase coil voltage Vt is equal to the overvoltage determination voltage V
It is determined whether it is equal to or more than tou (maximum set voltage). If this determination is NO of Vtmx <Vtou, the battery voltage Vs is input in step R18, and the process proceeds to step R19.
After setting the regulated voltage Vreg in step R,
At 20, it is determined whether the battery voltage Vs is higher than the regulation voltage Vreg. This judgment is Vs ≦ Vre
If the answer is NO in step g, the alternator 1
Of the field coil excitation duty signal fduty to the side where the field current increases, and the determination is YES when Vs> Vreg.
In step R22, the flow returns after setting the field coil excitation duty signal to the field current decreasing side in step R22.

On the other hand, the determination in step R17 is Vtm
When x ≧ Vtou is YES, in step R22,
The field coil excitation duty signal fduty is set to fduty = 0 to forcibly stop the alternator 1 from generating power, and then the process returns.

The maximum value Vtmx of the V-phase coil voltage Vt
The attenuation control of the minimum value Vtmn is performed according to the control routine of FIG. First, in step S1, the count of the maximum value hold timer Cvtmx is decreased, and in step S2, it is determined whether or not the maximum value Vtmx is Vtmx = 0. If this determination is YES for Vtmx = 0, the process proceeds directly to step S6, but if NO for Vtmx ≠ 0, the set value E is subtracted from the maximum value Vtmx in step S3 to obtain a new maximum value Vtmx (= Vtmx-E). Then, in step S4, the magnitude of the maximum value Vtmx and the V-phase coil voltage Vt is determined. This determination is Vtmx ≧ Vt
When NO is determined, the process directly proceeds to step S6. On the other hand, when the determination is YES at Vtmx <Vt, the maximum value Vtmx is reduced to the V-phase coil voltage V at step S5.
After setting to t, the process proceeds to step S6. That is, by the above operation, the maximum value Vtmx is gradually attenuated and finally reaches the V-phase coil voltage Vt.

In step S6, the count of the minimum value hold timer Cvtmn is decreased, and the next step S6 is executed.
At 7, it is determined whether or not the minimum value Vtmn is Vtmn = 0. When the determination is NO at Vtmn ≠ 0, the process returns as it is. When the determination at Vtmn = 0 is YES, the set value E is added to the minimum value Vtmn in step S8 to set a new minimum value Vtmn (= Vtmn + E). ,
In step S9, the V-phase coil voltage V having the minimum value Vtmn
The magnitude of t is determined. This determination is N for Vtmn ≦ Vt.
In the case of O, the process returns as it is, while the determination is Vtm
If YES for n> Vt, the process returns after setting the minimum value Vtmn to the V-phase coil voltage Vt in step S10. That is, by the above operation, the minimum value Vtmn is gradually increased to the V-phase coil voltage Vt.

In this embodiment, the rotation detecting means 22 is configured to detect the engine rotation speed Ne as a value related to the alternator rotation speed at step R15.

In steps R2 and R3, the maximum value Vtmx of the V-phase coil voltage Vt in the alternator 1 is determined.
Is configured to detect the maximum value.

Further, in step R8, the alternator generated voltage Vth obtained by doubling the average value of the maximum value Vtmx and the minimum value Vtmn of the V-phase coil voltage Vt is detected as a value related to the average value in the present invention. The average value detecting means 24 is configured.

Then, steps R9-R14, R16-
R22 constitutes a control means 21.
In step 1, the overvoltage determination voltage Vtou (maximum value setting voltage) is made variable in accordance with the engine speed Ne detected by the rotation detecting means 22, and the maximum of the V-phase coil voltage Vt detected by the maximum value detecting means 23 is set. alternator value Vtmx is, when the rise above the variable and the overvoltage determining voltage Vtou performs power generation stop of the alternator 1, and 2 times the average value of the detected V-phase coil voltage Vt by the mean value detecting means 24 power generation voltage Vth is the third set
An alarm is issued when the voltage exceeds the constant voltage B (average value setting voltage) , and the alternator generated voltage Vth is set to the third setting.
When the voltage is lower than the constant voltage B, the V-phase coil voltage Vt
Value Vtmx rises above the overvoltage determination voltage Vtou
The above-mentioned warning is not performed even in the state where the alarm is performed .

Steps R4, R7, S1 to S10
Thus, the voltage holding means 20 ′ is configured to hold the V-phase coil voltage Vt in the alternator 1 for a predetermined time and then gradually reduce the voltage to the alternator output voltage.

Therefore, in this embodiment, the V-phase coil voltage Vt of the V-phase coil section 3 of the alternator 1 is gradually reduced after being maintained for a predetermined time, so that the other U- and W-phase coil sections 2 of the alternator 1 are reduced. 4, the V-phase coil voltage Vt is held even while the generated voltage is being generated, and the alternator output voltage does not become 0 but becomes a voltage value that maintains the V-phase coil voltage Vt. For this reason, the cost can be reduced by omitting the monitoring triode, and the output voltage of the alternator 1 can be detected, and the same operation and effect as in the above-described reference example can be obtained.

In particular, in the case of this embodiment, as shown in FIG. 9, the maximum value Vtmx and the minimum value Vtmn of the V-phase coil voltage Vt in the alternator 1 are detected, and the maximum value Vtmx and the minimum value Vtmn are held for a predetermined time. After
It is gradually reduced. Then, an alternator power generation voltage Vth that is twice the average value is calculated from the maximum value Vtmx and the minimum value Vtmn, and the power generation voltage Vth is set to a third setting.
When the voltage rises above the voltage B (average value set voltage), the overvoltage alarm flag xgenlmp is set to xgenlmp = 1, the power generation abnormality lamp 12 is turned on, and an alarm is issued. That is, when the V-phase coil voltage Vt of the alternator 1 changes between the maximum value Vtmx and the minimum value Vtmn, the cycle changes according to the rotation speed of the alternator 1, but the average value of both is doubled. Since the generated voltage Vth is calculated, the actual alternator output voltage can be accurately detected. Therefore, the generated voltage Vth is set to the third setting.
By comparing with the voltage B, the alarm can be performed accurately and stably.

At this time, the V-phase coil voltage Vt
The maximum value Vtmx changes exactly following the actual output voltage of the alternator 1, but the minimum value Vtmn has poor followability, and the power generation voltage Vth obtained from the average value thereof is affected by the minimum value Vtmn. Poor response to voltage change. However, in this embodiment, when the maximum value Vtmx with good responsiveness rises above the overvoltage determination voltage Vtou (maximum value setting voltage), the field coil excitation duty signal fduty of the alternator 1 becomes fduty = 0.
As a result, the power generation of the alternator 1 is stopped, so that quick response is obtained, and the power generation that directly affects the protection of the alternator 1 can be stopped quickly.

In this embodiment, the engine speed Ne related to the speed of the alternator 1 is detected.
According to the engine speed Ne, the overvoltage determination voltage V
tou is changed. For this reason, as shown in FIG. 9, even if the voltage cycle changes due to the change in the engine speed Ne and the maximum value Vtmx of the V-phase coil voltage Vt changes accordingly, an appropriate overvoltage determination is performed in accordance with the change. Voltage Vto
u can be set, and when the output voltage of the alternator rises above the overvoltage determination voltage Vtou, the engine speed Ne
Can be accurately determined regardless of the variation of

In the above embodiment, the V of the alternator 1
Although the phase coil voltage Vt is input to the control unit 18, the voltage of the other U-phase or W-phase coil units 2 and 4 may be input.

In the above embodiment, the overvoltage determination voltage Vtou, which is a reference for the maximum value Vtmx of the V-phase coil voltage Vt of the alternator 1, is set according to the engine speed Ne. The setting may be made, and the same operation and effect as the above embodiment can be obtained.

[0054]

As described above, according to the first aspect of the present invention, when the output voltage of the alternator becomes an overvoltage state equal to or higher than the set voltage, at least one of the stop of the power generation and the alarm is performed. the voltage of one phase coil of the stator coils gradually decreased after holding for a predetermined time, together with the alternator output voltage which, with a maximum value of the voltage of one phase coil of the stator coil in the alternator, the maximum and minimum Value flat
A value related to average value respectively detected, performs power generation stop of the alternator when the maximum value of the voltage of the one phase coil portion rises above the maximum value set voltage, related to the mean value
There <br/> row an alarm when the value of engaging rises above the average value set voltage value related to the average value is lower than the average value set voltage
Sometimes the maximum voltage of the one-phase coil of the stator coil
Alarm is not issued even if the voltage rises above the maximum voltage , thereby reducing the cost by omitting the monitoring triode in the alternator and reducing the alternator output voltage based on the voltage of the one-phase coil unit. Accurate detection can be performed while changing the voltage following the actual generated voltage. Moreover, even if the voltage cycle of the one-phase coil portion of the stator coil changes according to the alternator rotation speed, the actual alternator output voltage is accurately detected by a value related to the average value of the maximum value and the minimum value. In addition to accurately and stably issuing an alarm, the maximum value with good response can be compared with the set voltage to quickly stop the power generation which directly affects the protection of the alternator.

According to the second aspect of the present invention, the set voltage is made variable in accordance with the alternator rotation speed or a value related to the rotation speed. Even if the voltage of the coil unit changes, an appropriate set voltage is set in accordance with the change, and the rise of the alternator output voltage to the overvoltage can be accurately determined irrespective of the alternation of the alternator rotation speed.

According to the third aspect of the present invention, the voltage holding means for gradually reducing the voltage of the one-phase coil portion of the alternator after holding the voltage for a predetermined time includes a diode for passing the voltage of the one-phase coil portion of the alternator; By using the diode and the capacitor and the resistor connected in series and in parallel with each other, a specific configuration of the voltage holding means can be easily obtained in terms of hardware.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of the present invention.

FIG. 2 is an electric circuit diagram showing an entire configuration of a reference example.

FIG. 3 is a flowchart illustrating an alternator output voltage control operation performed by a control unit according to a reference example.

FIG. 4 is a diagram showing waveforms of a V-phase coil voltage before and after passing through a voltage holding circuit.

FIG. 5 is a diagram corresponding to FIG. 2, showing the overall configuration of the embodiment of the present invention.

FIG. 6 is a flowchart illustrating an alternator output voltage control operation performed by the control unit in the embodiment.

FIG. 7 is a characteristic diagram showing setting characteristics of an overvoltage determination voltage.

FIG. 8 is a flowchart illustrating a control operation for attenuating the voltage of the one-phase coil unit in the control unit in the embodiment.

FIG. 9 is a characteristic diagram specifically showing the fluctuation characteristics of the voltage of the one-phase coil unit, the maximum value, the minimum value and the average value, the regulated voltage, and the battery voltage according to the fluctuation of the engine speed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Alternator 2 U-phase coil part 3 V-phase coil part 4 W-phase coil part 5 Stator coil 18 Control unit 19 CPU 20 Voltage holding circuit (voltage holding means) 20 'Voltage holding means 21 Control means 22 Rotation detection means 23 Maximum value detection Means 24 Average value detecting means D Diode C Capacitor R Resistance Vt V-phase coil voltage Vtmx Maximum value Vtmn Minimum value B Third setting voltage Vth Alternator generation voltage Vtou Overvoltage determination voltage (Maximum setting voltage) Ne Engine speed

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Keisuke Ogata 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Co., Ltd. (56) References JP-A-62-104439 (JP, A) JP-A-60 -109731 (JP, A) JP-A-2-310474 (JP, A) JP-A-59-56900 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02P 9/00- 9/48 H02J 7/16 H02J 7/24

Claims (3)

(57) [Claims] 1. An alternator control device comprising control means for stopping power generation of an alternator or at least one of an alarm when an output voltage of the alternator rises to a set voltage or more. Voltage holding means for holding the voltage for a predetermined time and then gradually decreasing the voltage to be the alternator output voltage; and a maximum value detecting means for detecting a maximum value of a voltage of a one-phase coil portion of the stator coil; Average value detecting means for detecting a value related to the average value of the maximum value and the minimum value of the voltage of the one-phase coil portion of the coil; when the maximum value of the voltage of the phase coil section for generating electric power stop of the alternator when the rise above the maximum specified voltage DOO In, an alarm when the value related <br/> to the average value of the voltage of one phase coil portions of the detected stator coil rises above the average value set voltage by the average value detecting means one
On the other hand, the value related to the average value is lower than the average value set voltage.
Sometimes, the maximum voltage of the one-phase coil of the stator coil is
The above alarm is issued even when the large value rises above the maximum voltage.
An alternator control device, characterized in that the alternator control device is configured not to be disturbed. 2. The alternator control device according to claim 1, further comprising: rotation detection means for detecting a rotation speed of the alternator or a value related to the rotation speed, wherein the control device detects the alternator rotation detected by the rotation detection device. An alternator control device characterized in that the set voltage is made variable in accordance with the number or a value related to the rotation speed. 3. The alternator control device according to claim 1, wherein the voltage holding means includes a diode for passing a voltage of a one-phase coil portion of a stator coil in the alternator, and a capacitor connected in series with the diode and in parallel with each other. And a resistor.