JPH07222376A - Output current controller for generator in vehicle - Google Patents

Abstract

PURPOSE:To provide an output current controller for the generator in a vehicle in which the deficiency of battery charging current can be restricted by restricting the duty factor at the time of starting an engine and relaxing the restriction of duty factor during rotation of the engine. CONSTITUTION:Upon application of an IG voltage, a generating voltage regulating means 28 turns a switch 34 ON/OFF based on the battery voltage thus feeding or interrupting the exciting current. At the rising time of generated voltage, a duty factor limiting means 29 limits the duty factor of the switch 34 to restrain power generation. Means 15 for relaxing the restriction of duty factor detects the rising rate of generated voltage after application of IG voltage and when the rising rate is high, a decision is made that the restriction can be relaxed thus relaxing the restriction. When the rising rate is low, the engine is starting and thereby the restriction is not relaxed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an output current control device for a vehicle generator.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 3-173324 discloses an output current control device (also called a regulator) for a vehicle generator.
In, after applying the IG voltage, if it is detected that the power generation voltage has risen to a predetermined level (that is, if power generation is detected), the conduction rate of the exciting current control switch is limited for a predetermined time to suppress power generation, and thereafter, It is disclosed that the conductivity is gradually increased to a required value.

[0003]

However, in the above-mentioned conventional method, the conduction rate limitation is not necessary because the conduction rate limitation is performed for a predetermined time after power generation detection regardless of the engine state. Nonetheless, there was a problem that the conductivity limit was maintained and the battery capacity decreased.

For example, when the acceleration of the vehicle is improved by reducing the engine load while the vehicle is running, the IG voltage to the regulator is shut off for a required short period while the engine is rotating or the vehicle is running, and then the regulator is turned on. IG
The voltage may be reapplied. In addition, the IG voltage may temporarily drop due to ripples in the generated voltage.
In such a case, in the above-mentioned conventional method, the IG
Since the voltage once decreases and then the power generation voltage increases, the above-mentioned conductivity rate limitation (power generation suppression) is performed for a predetermined time thereafter, which causes a problem that the battery capacity decreases.

Further, there has been a problem that the charge warning lamp is lit up for a long time when the generated voltage is temporarily lowered, which is troublesome. Further, when the IG voltage is applied to the regulator during the rotation of the generator to inspect the output state of the generator, there is also a problem that the inspection time becomes long if the above-described conductivity limitation, that is, power generation suppression works.

The present invention has been made in view of the above-mentioned problems, and the power generation for a vehicle is capable of limiting the conduction rate when the engine is started and suppressing the limitation of the conduction rate when the engine is rotating to prevent the shortage of the battery charging current. It is a first object of the invention to provide an output current control device for a machine. Further, the present invention provides an output current control device for a vehicle generator capable of preventing a shortage of battery charging current due to activation of the above-described conductivity rate limitation when the power generation voltage temporarily rises again during engine rotation and then rises again. That is the second purpose.

It is a third object of the present invention to provide an output current control device for a vehicular generator capable of shortening the lighting of the charge warning lamp when the generated voltage temporarily drops while the engine is rotating. . Further, it is a fourth object of the present invention to provide an output current control device for a vehicular generator capable of avoiding the extension of the inspection time due to the limitation of the conductivity when the power generation state is inspected while the generator is rotating.

[0008]

According to a first aspect of the invention, an IG voltage is applied as a power supply voltage from a battery charged by a vehicle generator driven by an engine through an ignition switch, and the battery is also used. Power generation voltage adjusting means for adjusting the excitation state of the vehicle generator based on the state quantity related to the terminal voltage, and limiting the excitation amount of the vehicle generator when the generation voltage of the vehicle generator rises to generate power. In an output current control device for a vehicle generator that includes a power generation limiting unit that suppresses, a speed at which the power generation voltage rises after the IG voltage is applied to the power generation voltage adjusting unit is detected, and the rising speed is detected according to the detected rising speed. It is characterized in that a suppression amount adjusting means for changing the suppression amount of power generation is provided.

According to a second aspect of the present invention, in the first aspect, the suppression amount adjusting means detects the rising speed based on the power generation voltage after a predetermined time has elapsed from the time when the IG voltage was applied. It is characterized by doing.
According to a third aspect of the present invention, in the first aspect, the suppression amount adjusting means detects the rising speed based on the time from when the IG voltage is applied to when the generated voltage reaches a predetermined value. It has a feature.

According to the invention described in claim 4, in the invention described in claim 1, the predetermined value is set to be higher than a power generation voltage during cranking and lower than a power generation voltage during idle. . The invention described in claim 5 is characterized in that, in the invention described in claim 1, the suppression amount adjusting means releases the restriction of power generation by the power generation restriction means.

According to a sixth aspect of the present invention, in the first aspect, the power generation detecting means for lighting the charge warning lamp when the generated voltage becomes less than the power generation detection threshold voltage after the IG voltage is applied. Then, the power generation detection threshold voltage is set to a small value until a predetermined power generation detection time has elapsed from the application of the IG voltage, and the power generation detection threshold voltage is set to a large value after the power generation detection time has elapsed. And a threshold value changing means.

The invention described in claim 7 is characterized in that, in the invention described in claim 1, the excitation state of the generator corresponds to the conductivity of the switch means for connecting and disconnecting the excitation current of the generator. Hereinafter, terms related to the present invention will be described. The state quantity related to the terminal voltage of the battery (hereinafter, also simply referred to as battery voltage) may be the terminal voltage of the battery, or may be the state quantity associated with it.

The generated voltage may be the rectified voltage of the output terminal voltage of the generator, or the terminal voltage of the battery to which the rectified voltage is applied. In the case where the exciting current is interrupted by the switch means, suppression of power generation means that the conductivity of the switch means is at least a value less than 100%,
This means that the power generation voltage adjusting means limits the conductivity to a value smaller than the conductivity output to the switch in order to obtain the power generation amount to be output based on the state quantity related to the battery terminal voltage.

The rising speed of the generated voltage is detected by the IG
A comparator or the like determines whether the time from the time when the voltage is applied to the regulator has a certain relationship (it may be the time when the IG voltage is applied to the regulator) to the time when the generated voltage reaches the predetermined value is the predetermined time or less. Besides, it is also possible to determine with a comparator or the like whether or not the increase amount of the generated voltage within a predetermined time is a predetermined value or more. Furthermore,
Since the rising speed of the generated voltage greatly depends on the cranking time of the starter, it is possible to detect the rising speed of the generated voltage by determining whether the parameter related to the cranking time of the starter exceeds a predetermined level. it can. For example, the battery voltage or IG voltage decreases during cranking of the starter, so it is determined whether the rising speed of the generated voltage is fast or slow depending on the time until the battery voltage or IG voltage falls below a predetermined level and then exceeds the predetermined level. That is, it is possible to determine whether the engine is starting or the engine is rotating.

During cranking of the engine, the engine is being driven by the starter. The adjustment of the suppression amount is defined as including both the relaxation of the suppression amount and the stop of the suppression. Further, the suppression amount may be the suppression time. In one aspect, for example, if the rising speed of the generated voltage is relatively slow, the suppression amount may be reduced, and if it is relatively fast, the suppression amount may be increased.

The IG voltage is a voltage applied from the battery to the output current control device of the vehicle generator through the ignition switch. The application of the IG voltage includes the case where the IG voltage drops below a predetermined level and then rises above the predetermined level again.

[0017]

FUNCTION AND EFFECTS OF THE INVENTION The power generation voltage adjusting means executes the excitation based on the battery voltage after applying the IG voltage. The power generation limiting means limits the amount of excitation at the time of rising of the power generation voltage to suppress power generation, so that during engine start (hereinafter,
(Also referred to as engine startup) to reduce the engine load and improve the starting characteristic of the engine speed, that is, the starting characteristic. In this way, the engine starting characteristics are significantly improved especially in cold weather.

Further, according to the present invention, the rising speed of the generated voltage after the IG voltage is applied is detected, and when the rising speed is fast, the amount of power generation suppression (reduction of engine load) during engine rotation can be reduced. It is determined to be possible and the amount of suppression thereafter is reduced. On the other hand, when the start-up is slow, it is determined that the engine starting characteristic needs to be improved even when the engine is started, and the suppression amount is not reduced.

With this configuration, the following effects can be obtained.
First, it is possible to improve the engine startability and to secure a good amount of power generation when the engine is rotating, so that it is possible to suppress insufficient battery charging, suppress deterioration of battery durability, and reduce battery terminal voltage. The decrease can be suppressed. Also, when inspecting the output state of the generator by shutting off and reapplying the IG voltage to the regulator while the generator is rotating, the amount of suppression is reduced and the rise of the generated voltage becomes faster, so the inspection time should be shortened. You can also

In the invention described in claim 2, the rising speed is detected based on the generated voltage after a predetermined time has elapsed from the time when the IG voltage was applied to the generated voltage adjusting means, and in claim 3, The invention described above detects the rising speed based on the time until the generated voltage rises to a predetermined value. Such a detection method is reliable and has an advantage that the circuit can be easily configured. Normally, when the IG voltage is applied to the regulator while the generator is rotating (the engine is rotating), the generated voltage rises to about the battery voltage in about 150 msec or less. On the other hand, when the engine is started, the operating time of the starter (engine cranking time) is required, and the rise of the generated voltage is delayed. Therefore,
If the predetermined time is set to 100 to 200 ms and the predetermined voltage value is set to 0.5 to 10 V, for example, whether or not the voltage rises to the predetermined voltage value by the predetermined time or the time until the voltage rises to the predetermined voltage value is predetermined. Depending on whether it is within the time, the rise of the generated voltage can be determined quickly and reliably.

In the invention described in claim 4, the predetermined voltage value is set to be higher than the power generation voltage at the time of cranking the engine. With this configuration, when the engine is cranking by being driven by the starter, the generated voltage due to the residual magnetic flux of the generator or the magnetic flux generated by the exciting current is erroneously determined to be during engine rotation and the amount of power generation suppression is reduced. It is possible to avoid such a situation. Further, the predetermined voltage value is set lower than the power generation voltage when the engine is idling. With this configuration, it is possible to avoid a situation in which it is determined that the engine is starting when the engine is rotating and the power generation suppression amount is not reduced.

In the invention described in claim 5, the power generation by the power generator can be executed by the capacity thereof. In the invention described in claim 6, after the IG voltage is applied, the charge warning lamp is turned on when the power generation voltage becomes less than the power generation detection threshold voltage. Furthermore, a predetermined power generation detection time from the application of the IG voltage (generally 150 msec, preferably the time required to rise the power generation voltage during engine rotation (generally 1
(Time longer than 00 msec) ends, the power generation detection threshold voltage is set to a small value, and after the power generation detection time ends, the power generation detection threshold voltage is set to a large value.

In this way, when the engine is rotating, the IG
When the generated voltage rises in a short time after the IG voltage is applied, such as when a voltage is applied, the generation detection threshold voltage is small, so the rising of the generated voltage can be detected quickly, and an annoying charge is generated. The warning lamp can be turned off quickly. Furthermore, since the threshold voltage for power generation detection is raised after the rising of the power generation voltage is detected, if the power generation is performed by the residual magnetic flux instead of the exciting current (for example, when the rotor coil is disconnected), the power generation voltage will be detected at this high power generation. Since it is lower than the threshold voltage, it can be detected reliably and quickly, and the charge warning lamp can be turned on to give an alarm.

The power generation detection time can be made equal to the predetermined time of the invention described in claim 2, and the predetermined voltage value of the invention described in claim 3 is set as the power generation detection threshold voltage. By doing so, the circuit configuration can be greatly simplified and shared. Also,
When the excitation is adjusted by the switch means as in the invention described in claim 7, the power generation suppression control can be performed based on the conductivity, so that the control circuit can be easily formed.

[0025]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIG. First, main components will be described. Reference numeral 1 denotes an output current control device (regulator) of an engine (not shown) driven vehicle generator (three-phase AC generator having a three-phase full-wave rectifier 70 for rectifying generated voltage) and a vehicle battery ( The switch 34 is used to apply an excitation voltage to the rotor coil (excitation coil) 6 of the generator 2 so that the output voltage of the vehicle generator 2 that charges the battery 3 (charge voltage to the battery 3) becomes a predetermined voltage Vr. Intermittent. Regulator 1
Is supplied with the IG voltage from the ignition switch 4 as a power supply voltage.
When is opened, the switch 34 is cut off to stop the power generation of the generator 2. Further, when the generated voltage of the generator 2 is equal to or lower than a predetermined level or 0 even when the ignition switch 4 is closed, that is, in this embodiment, the rectified value of the one-phase voltage Vp of the stator coil 7 of the generator 2 ( When the power generation voltage Vp 'in the present invention is equal to or less than the predetermined value Vrp, Tr3
5 is turned on, and the charge warning lamp 5 is turned on.

Reference numeral 14 is a capacitor that is charged when the ignition switch 4 is turned on. 15
The transistor (hereinafter also referred to as Tr) 16 is shut off for a predetermined time (first set time, about 150 ms) after the ignition switch 4 is turned on until the voltage of the capacitor 14 rises to a predetermined value. Is a comparator for.

Reference numeral 19 is a second capacitor which is charged by the current flowing through the resistor 20 by shutting off Tr21 when the rectified value Vp 'of the one-phase voltage Vp of the stator coil exceeds the voltage Vrp. The charging voltage Vc of the capacitor 19 and the resistance values of the resistors 17 and 20 are set so that it takes about 10 seconds (second set time) for charging to rise to the predetermined voltage Vr when the Tr 16 is conducting. A CR time constant depending on the capacity of 19 is set. On the other hand, the charging voltage Vc has the above-mentioned time constant so that it takes about 50 ms (third set time) for the charging time to rise to the predetermined voltage Vr when the Tr 16 is cut off.

Reference numeral 22 is a comparator for comparing the rectified value (generated voltage) Vp 'with a predetermined voltage Vrp. The voltage Vrp is a threshold voltage applied to the comparator 22 for power generation detection,
It is a voltage value obtained by dividing the power supply voltage Vcc by the resistors 51 and 52. The comparator 22 detects power generation when the power generation voltage Vp ′ exceeds the voltage Vrp, and turns off the Trs 21 and 35. The diode 24, the capacitor 23, and the resistor 25 are a rectifying circuit that rectifies the one-phase voltage Vp.

Reference numeral 29 is an oscillating circuit for outputting a rectangular pulse signal having a constant duty, and the Hi level ratio (ON duty ratio) is set to about 10%. The resistors not marked in the drawing are base current limiting resistors of the transistor. Next, the operation of the regulator 1 will be described while explaining other components. (When the engine is started) When the ignition switch 4 is turned on while the engine is stopped, the output of the comparator (also referred to as comparator) 22 becomes Hi because the power generation of the generator 2 is stopped, and the Tr 35 is turned on and the charge lamp 5 is turned on. Light up.

Further, since the Tr21 also becomes conductive, the charging voltage Vc becomes Lo, the + input of the comparator 30 becomes lower than the-input, that is, the predetermined voltage Vr, and the comparator 30 outputs Lo to the OR circuit 31. As a result, the output of the OR circuit 31 becomes equal to the pulse waveform output from the oscillator circuit 29. Reference numeral 28 is a comparator that compares the partial voltage Va of the battery voltage with the predetermined voltage Vr. In this case where the generator 2 is not generating power, the comparator 28 outputs Hi to the AND circuit 32 and the AND circuit. 32 applies the pulse waveform output from the oscillation circuit 29 to the base of the Tr (switch) 34,
The Tr 34 conducts in synchronization with the pulse waveform, and intermittently applies an exciting voltage to the rotor coil 6. That is, when the ignition switch 4 is turned on while the engine is stopped, the exciting voltage is applied to the rotor coil 6 at a conduction rate synchronized with the pulse waveform.

Next, after the ignition switch 4 is turned on, the power supply voltage Vcc of the regulator 1 rises in about 1 ms, and the voltage at the connection point between the resistor 43 and the constant voltage diode 12 becomes a constant level accordingly. Tr1
1 conducts, and the capacitor 14 is charged through the resistor 13. The comparator 15 divides the power supply voltage Vcc output by the voltage dividing circuit including the resistors 41 and 42 into a comparator 14
Is compared with the charging voltage Vc ′ of No. 1, and when the charging voltage Vc ′ becomes Hi, the Tr16 is turned on. Here, the resistors 41, 4
The capacitances of the capacitors 2 and 13 and the capacitor 14 are set so that the output of the comparator 15 is inverted to Hi and the Tr 16 is turned on about 150 ms after the ignition switch 4 is turned on.

Further, the meaning of turning on the Tr16 with a delay of about 150 ms from the turning on of the ignition switch 4 will be described below. That is, even if the engine is started at the same time that the ignition switch 4 is turned on at the time of starting the engine, the cranking time of the engine by the starter is generally 200 ms or more. Before the output of 22 becomes Lo, T
r16 is in a conductive state.

Therefore, when the engine is started, the generated voltage V
If p ′ exceeds the voltage Vrp and power generation is detected by the comparator 22, the transistor 16 is turned on before the transistor 21 is turned off. Therefore, after the transistor 21 is turned off, the capacitor 19 is charged only by the resistor 20 and is charged to the reference voltage Vr. Approximately 10 s is required to complete. During this charging time, the output of the comparator 30 becomes Lo, the above-mentioned pulse waveform is applied to the Tr 34, the average excitation voltage of the rotor coil 6 becomes constant at 10% like the ON duty ratio of the above-mentioned pulse waveform, and the generator 2 Power generation is suppressed, and excessive torque is not applied to the engine immediately after starting.

On the other hand, when 10 seconds or more elapses after the ignition switch 4 is turned on, the charging voltage Vc of the capacitor 19 becomes equal to or higher than the predetermined voltage Vr due to the resistor 20, the output of the comparator 30 becomes Hi, and the rotor coil 6 is compared. Bowl 28
It is controlled by the output voltage of. That is, the comparator 28 compares the predetermined voltage Vr with the partial voltage Va of the battery voltage,
By the comparison output, the switch 34 is opened and closed to control the divided voltage Va of the battery voltage to the predetermined voltage Vr.

The predetermined voltage Vr is a voltage division of the target battery voltage, that is, a voltage division of the power supply voltage Vcc. If the resistance 43 is ignored, the power supply voltage Vcc is the voltage between the base and emitter of the resistor 10 and the transistor 11, and the constant voltage diode 1
It is an output voltage of a constant voltage circuit composed of a circuit connected in series with 2, and is stabilized regardless of fluctuations in the IG voltage. (Shipment Inspection) Next, the shipment inspection work at the time of product shipment of the generator 2 will be described.

The rotation speed of the generator 2 is set to the rated rotation speed (5000
When the ignition switch 4 is turned on in the state of (rpm), the excitation voltage synchronized with the pulse waveform from the oscillation circuit 29 is applied to the rotor coil 6 as in the case of starting the engine described above. Generally, if the time constant of the rotor coil 6 (phase delay of energization current, about 150 ms) is about, the one-phase voltage Vp of the generator 2 becomes equal to or higher than the voltage of the battery 3. After the ignition switch 4 is turned on, the predetermined value (power generation detection threshold value) Vrp is appropriately selected.
Power generation can be detected within 0 ms.

At the time of this power generation detection, the capacitor 14 is hardly charged and the charging voltage Vc 'is Vr.
Since it is below, Tr16 is cut off, the charging time of the capacitor 19 becomes 50 ms due to the addition of the charging current from the resistor 17, and as a result, the ignition switch 4
The output of the comparator 30 becomes Hi within 150 ms after turning on, and it becomes possible to excite the rotor coil 6 with an ON duty ratio of 100% (when the partial voltage Va of the battery voltage is lower than the predetermined voltage Vr), and the generator is generated in a short time. A maximum output of 2 can be inspected.

(During Engine Rotation) Next, the operation during engine rotation will be described. When the ignition switch 4 is turned off and then turned on again while the engine and the generator 2 are rotating, or for some reason, the IG voltage applied to the regulator 1 is temporarily reduced significantly, and the regulator 1 causes the IG voltage after that to decrease. When it is determined that the ignition switch 4 is turned on (when the regulator 1 performs the same operation as when the ignition switch 4 is turned on), it means that the ignition switch 4 is turned on while the engine and the generator 2 are rotating. The same control operation as at the time of the shipping inspection is performed.

That is, the output of the comparator 30 becomes Hi within 150 ms after the ignition switch 4 is turned on, and the conduction rate limitation of the switch 34 can be released early. (Second Embodiment) A second embodiment will be described with reference to FIG. FIG. 3 shows the regulator 1 of FIG.
2 is a timing chart of.

Characteristic points of this embodiment will be listed below. In this embodiment, the capacitor integration method of the first embodiment is a counter method. That is, in this embodiment, 100% from the time when the power generation is detected by the comparator 22 (when the battery voltage drops)
The capacitor 19 that determines the conduction time limit time until the excitation of the rotor coil 6 (release of the conduction ratio limitation) is changed to the n-stage binary counter 108.

Further, in the first embodiment, the capacitor 14 which determines a predetermined time (first time) from the application of the IG voltage is set to I
The holding circuit 104 is changed to be set by the trigger pulse TGP generated when the G voltage is applied. The hold circuit 104 has a predetermined delay time (150 m) after applying the IG voltage.
It is reset by the trigger pulse CK2 generated after elapse of sec).

Further, after the lapse of the predetermined delay time (first time) from the time of applying the IG voltage, the output of the NOT circuit 105 is set to Hi, so that the power generation detection threshold value becomes larger than the predetermined value Vrp by a larger predetermined value. Changed to Vrph.
The predetermined value Vrp is set to be smaller than the rectified value Vp 'of the one-phase voltage Vp of the stator 7 generated by the residual magnetic flux of the rotor coil 6 when the switch 34 is cut off, and the predetermined value Vrph is the residual magnetic flux. Is set to a value larger than the rectified value Vp 'of the one-phase voltage Vp of the stator 7 generated by the.

The power supply voltage Vcc is determined by a constant voltage circuit including the constant voltage diode 101, the base-emitter voltage of the transistor 102, and the resistor 10 if the resistor 120 is ignored. The capacitor 100 delays the power supply voltage Vcc for a short time with respect to the IG voltage to form an initial trigger pulse TGP for the counter 108 and the hold circuit 104.

Other configurations and operations will be described below. (When the IG voltage is applied) When the IG voltage is applied to the IG terminal of the regulator 1, the node CKO is charged by the resistor 121 for a short time (see FIG. 3) until the Tr 102 becomes conductive due to the delay due to the capacitor 100 or the like. Hi
And the initial trigger pulse TGP becomes the hold circuit 104.
Of the counter 108 is input to the reset terminal R2 of the counter 108, and the count value of the counter 108 is reset to a value of 2 ⁿ . When the Q output of the hold circuit 104 becomes Hi, the output of the NOT circuit 105 becomes Lo, the voltage of the line L becomes a low predetermined value Vrp (here, 2V), and the power generation detection threshold voltage of the comparator 22 is this low Vrp. Becomes

A pulse CK2 from the clock circuit 110 is periodically input to the reset terminal R of the hold circuit 104, and the pulse CK2 has a long period (150 msec) as shown in FIG. Therefore,
150m for a predetermined time (first time) after the IG voltage is input
Until the elapse of sec, the AND circuit 107 outputs Lo, and the reset signal Hi is not input to the reset terminal R1 of the counter 108.

(At the time of engine rotation, when the rising speed of the generated voltage is fast) The engine is rotating and rectified within a predetermined time after application of the IG voltage (here, 150 ms, that is, the period when the hold circuit 104 is set). Value V
When p ′ rises, the output of the comparator 22 becomes Lo, the charge warning lamp 5 is turned off, and NOT
The output of the circuit 113 becomes Hi, and the clock generation circuit 1
The counter 108 counts up from the count value 2 ⁿ at the timing of the pulse CK1 output from 11.
At this time, the output of the NOT circuit 109 is naturally Hi.

[0047] When the count value of the pulse CK1 by the counter 108 of the clock generation circuit 111 is counted up to 2 ^0, Q output of the counter 108 becomes Hi,
The output of the NOT circuit 109 becomes Lo, and the AND circuit 1
The output of the 12 the count-up is stopped as Lo, the count value remains at 2 ^0. At the same time, the output of the OR circuit 31 becomes Hi, and the rotor coil 6 can be excited with an ON duty ratio of 100%. Further, the NOT circuit 106
Output becomes Lo, which prevents Hi from being input to the reset terminal R1 even if the pulse CK2 is input to the AND circuit 107 after 150 msec has elapsed.

That is, in this case, the rapid rise of the rectified value Vp 'is detected and the conduction rate limitation of the switch 34 is released after 150 msec, so that a rapid battery strong charge is realized. In addition, 150ms after applying the IG voltage
After a lapse of time, the pulse CK2 from the clock circuit 110 is transmitted to the reset terminal R of the hold circuit 104 as shown in FIG.
The Q output of the hold circuit 104 becomes Lo,
The NOT circuit 105 outputs Hi, the voltage of the line L becomes a high predetermined value Vrph (here, 10 V), and the comparator 2
The voltage detection threshold value of 2 (+ input terminal voltage) is set high.

In this way, immediately after the IG voltage is applied (1
After 50 msec), the rise of the generated voltage can be detected quickly by the slight rise of the generated voltage, and the threshold voltage increases while the engine is rotating. Therefore, even if the rotor coil 6 is broken, the residual magnetization causes power generation. Even if the voltage is generated, the comparator 22 can surely output the power generation stop (Hi), and the charge lamp 5 can be reliably turned on. (When the rising speed of the generated voltage is slow when the engine is started) The rising of the power generation is detected (that is, the comparator 22 is Lo.
However, a case where 150 ms or more has elapsed after the application of the IG voltage will be described.

When 150 ms elapses after the IG voltage is applied without the comparator 22 detecting the rising of the rectified value Vp ', the pulse CK2 from the clock circuit 110 is input to the AND circuit 107 as shown in FIG. Since the knot circuit 106 and the hold circuit 104 output Hi, the count value of the counter 108 is reset to 2 ¹ .

The pulse CK2 is applied to the hold circuit 104.
Is input to the reset terminal R to reset the Q output of the hold circuit 104 to Lo. As a result, the knot circuit 10
5 becomes Hi, and the threshold value of the comparator 22 is the predetermined value Vrp.
is increased to h. After that, when the rectified value (power generation voltage) Vp ′ rises to a predetermined value Vrph or more due to engine start, the comparator 22 becomes Lo (power generation is detected), and the counter 108 counts up at the timing of the pulse CK1. 2 a value of ¹ (2 ⁿ -1) times of becomes long value of the count-up done 2 ^0, once they become 2 ^0, the aND circuit 112 outputs a Lo, count-up is completed counter 108 , OR circuit 31 and NOT circuit 106
The Hi voltage is output to. Here, an S-priority FF is used for 104, and a one-shot multivibrator is used for 110.

Therefore, in this case, the conduction rate of the switch 34 can be limited by the ON duty ratio of the oscillation circuit 29 until the time (2 ⁿ -1) times the period (T ₁ ) of the pulse CK1 elapses. Therefore, in this case, the comparator 22
The charge warning lamp 5 is lit until the time when the power generation is detected.

The lighting control of the charge warning lamp 5 when the engine is rotating will be further described below. Within a predetermined time (150 ms) after the IG voltage is applied, that is, when the output of the hold circuit 104 is set to Hi, the output of the NOT circuit 105 becomes Lo and the NOT circuit 105 causes the current from the line L via the resistor 123 to flow from the line L. Is absorbed to set the voltage of the line L to a low predetermined value Vrp, thereby setting the power generation detection threshold value of the comparator 22 to a low predetermined value Vrp, so that when the IG voltage is applied during rotation of the generator 2. The charge warning lamp 5 is lit only for a short time (within 100 ms) until the power generation of the generator 2 rises to this low predetermined value Vrp.

On the other hand, power generation startup (within 100 ms)
After that, the first time (150
ms), the threshold voltage of the comparator 22 becomes a high predetermined value Vrph. Therefore, if power is being generated by the residual magnetization instead of the exciting current, the power generation voltage Vp 'is small and the comparator 22 is Hi. Therefore, the charge warning lamp 5 can be turned on by detecting it.

In the above embodiment, the hardware electronic circuit is used, but it is also possible to use another hardware electronic circuit having the same function or a microcomputer circuit. By the way, in the first embodiment, 28 is a main part of the generated voltage adjusting means, 29 is a main part of the conductivity limiting means, and 22 is a part of the conductivity limiting suppressing means.
A part 21 for detecting whether or not the rise of the generated voltage after applying the G voltage is fast, and 21 is a part of the conductivity limit suppressing means, and a part for suppressing the conductivity limit by the conductivity limiting means when the rise is fast. Is.

Further, in the second embodiment, 22 constitutes a main part of the power generation detecting means, and includes the hold circuit 104 and NOT.
The circuit 105 constitutes an essential part of the threshold value changing means.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an apparatus according to a first embodiment.

FIG. 2 is a circuit diagram showing an apparatus according to a second embodiment.

FIG. 3 is a timing chart showing voltage waveforms of respective parts of FIG.

[Explanation of symbols]

1 is an output current control device (regulator) for a vehicle generator, 2 is a vehicle generator, 3 is a battery, 4 is an ignition switch, 28 is a comparator (generation voltage adjusting means),
Reference numeral 29 is an oscillation circuit (conduction rate limiting means), 21 is a transistor, 22 is a comparator, 21 and 22 are conduction rate restriction suppressing means,
104 is a hold circuit, 105 is a NOT circuit, 104,
105 is a threshold value changing means.

Claims (7)

[Claims] 1. An IG voltage is applied as a power supply voltage from a battery charged by a vehicular generator driven by an engine through an ignition switch, and the vehicular power generation is based on a state quantity related to a terminal voltage of the battery. Of a vehicular generator, which includes a power generation voltage adjusting means for adjusting the excitation state of the vehicular generator, and a power generation limiting means for limiting the amount of excitation of the vehicular generator when the power generation voltage of the vehicular generator rises to suppress power generation The output current control device includes a suppression amount adjustment unit that detects a rising speed of the generated voltage after the IG voltage is applied to the generation voltage adjusting unit and changes the suppression amount of the power generation according to the detected rising speed. An output current control device for a vehicle generator, comprising: 2. The output of the vehicular generator according to claim 1, wherein the suppression amount adjusting means detects the rising speed based on the generated voltage after a predetermined time has elapsed from the time when the IG voltage was applied. Current control device. 3. The output of the vehicular generator according to claim 1, wherein the suppression amount adjusting means detects a rising speed based on a time from when the IG voltage is applied to when the generated voltage reaches a predetermined value. Current control device. 4. The output current control device for a vehicle generator according to claim 1, wherein the predetermined value is set to be higher than a power generation voltage during cranking and lower than a power generation voltage during idle. 5. The output current control device for a vehicle generator according to claim 1, wherein the suppression amount adjusting means releases the restriction of power generation by the power generation restricting means. 6. A power generation detecting means for lighting a charge warning lamp when the power generation voltage is lower than a power generation detection threshold voltage after the IG voltage is applied, and until a predetermined power generation detection time elapses after the IG voltage is applied. The vehicle power generation according to claim 1, further comprising: a threshold value changing unit that sets the power generation detection threshold voltage to a small value and sets the power generation detection threshold voltage to a large value after the power generation detection time has elapsed. Output current control device for machine. 7. The output current control device for a vehicular generator according to claim 1, wherein the excited state of the generator corresponds to the conductivity of a switch means for connecting and disconnecting the exciting current of the generator.