JPH03173325A - Ac generator controller for vehicle - Google Patents

Abstract

PURPOSE:To prevent production of belt slip noise under cold weather by regulating the generator voltage to a first predetermined value lower than a battery voltage until a predetermined time elapses after start of power generation and then regulating the generator voltage to a second predetermined value higher than the battery voltage. CONSTITUTION:Battery voltage is 12V, for example, and a second comparator 309 detects whether the output voltage of a generator has reached a first predetermined value, i.e., 10V, and a first comparator 308 detects whether the output voltage of the generator has reached a second predetermined value, i.e., 14V. When the output voltage of generator reaches 8V, a timer 310 is actuated and produces a High signal for a predetermined time. i.e., 10sec, while produces a Low signal at other time. Consequently, generator voltage is regulated to 10V, which is lower than the battery voltage, for 10sec after start power generation of the generator 1 and then it is regulated to 14V which is higher than the battery voltage.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a control device for a vehicle alternator.

[Prior Art] A vehicle alternator is generally driven by an engine via a V-belt or the like, and converts rotational energy into electrical energy to produce an output. As a result, there is an increasing demand for high output power.

However, as the output of the generator increases, the load torque of the engine driven by the generator increases.

Therefore, the engine rotation tends to become unstable, especially at a time when explosion and combustion are unstable, such as immediately after the engine is started. In addition, when the engine is in operation, the generator outputs maximum output to charge the overloaded battery by starting the starter motor, which increases the load on the engine and makes the engine rotation even more unstable. become more susceptible to the condition. This phenomenon is especially noticeable in cold weather.

Conventionally, a method for solving this problem, as disclosed in Japanese Unexamined Patent Publication No. 58-66538, is to reduce the voltage to the field coil for a predetermined period of time in an unstable operating state immediately after starting the engine. A method has been proposed that attempts to stabilize engine idle rotation by suppressing the amount of electricity and reducing engine load.

``Problem to be solved by the invention'' The conventional device described in the above publication suppresses and controls the field current for a predetermined period of time immediately after the engine starts. Output is 0 (A)
It is not. Therefore, in the case of this device, the load torque caused by the generator drive cannot be completely eliminated, and the engine rotation cannot be sufficiently stabilized.

Additionally, in cold weather, the V-belt driven by the generator and the boob generally do not fit well, and in the case of the conventional device described above, belt slipping noise may be generated when driving torque is generated in the generator in such cold weather. There is.

This invention was made to solve the above-mentioned problems, so it completely eliminates the load torque caused by the generator drive immediately after the engine starts, stabilizes the engine rotation, and improves the stability of the belt during cold weather. The purpose is to prevent the occurrence of slip noise.

[Means for Solving the Problems] A control device for a vehicle alternator according to the present invention includes a voltage regulator that adjusts the output voltage of the alternator to a predetermined value by controlling the field current intermittently using a switching element. The generated voltage of the alternator is adjusted to a first predetermined value lower than the storage battery voltage until a predetermined time has elapsed after the start of power generation, and after the predetermined time has elapsed, the generated voltage is adjusted to a second predetermined value higher than the storage battery voltage. It is equipped with a means for adjusting.

[Operation] In the present invention, the generated voltage is suppressed to a voltage lower than the storage battery voltage until a predetermined period of time has passed after the alternator starts generating electricity. Then, after the predetermined time has passed,
The power generation voltage is adjusted to be higher than the storage battery voltage, and normal charging output operation begins.

[Embodiment] The figure is a circuit diagram showing an embodiment of a control device for a vehicle alternator according to the present invention.

In this embodiment, the alternator (+) has an armature coil (101) and a field coil (102), to which a rectifier (2) is connected. The rectifier (2) has a main output terminal (201), an auxiliary output terminal (202) and a ground terminal (203). Further, a voltage regulator (3) is connected to the field coil (+02) to control the output voltage of the alternator by intermittent control of the field current.

"The two-legged voltage regulator (3) includes a resistor (301) and a zener diode (302) that constitute a constant voltage source (A),
Voltage dividing resistors (303), (304) (305) for dividing the constant voltage source (A) to form a basic voltage circuit (1), and voltage dividing resistors (306), (307) for detecting the generator output voltage. , a first comparator (308) that compares and outputs the first reference voltage from the reference voltage circuit and the generator output voltage, and a second comparator (308) that compares the second reference voltage and the generator output voltage. 309), a timer (310) connected to the voltage dividing resistors (306) and (307) for detecting the generator output voltage and activated by detection of the output voltage at a predetermined level, and a timer (310) connected to the constant voltage source (A). Resistance (311), (31
2), the base is connected to the constant voltage source (A) via the diode (313) and one resistor (311), and is connected to the output terminal of the first comparator (308),
It is also connected to a second comparator (309), further connected to a constant voltage source (A) via a diode (314) and the other resistor (312), and a timer (31
A control transistor (315) connected to the output terminal of
), a power trannostar (317) to which a base current is applied via a resistor (316) and is intermittently controlled by the control transistor (315), and a power trannostar (317) connected in parallel to the field coil (102) for intermittent surge control. It is composed of a sub-rayon diode (318) that absorbs.

The main output terminal (20+) and the auxiliary output terminal (202) of the rectifier (2) are connected to the storage battery (.1). One end of the field coil (102) is connected to the storage battery (4) via the key switch (5), an initial excitation resistor (6) is connected therebetween, and the other end is connected to the voltage regulator (3). )It is connected to the. In addition, vehicle electrical loads (
7) is connected to a storage battery (5) via a negative direction switch (8).

Here, to explain the case of a +2V system vehicle generator, the storage battery voltage is 12V, and the second comparator (3
09) is IOV where the output voltage of the generator is the first predetermined value
The first comparator (30
8) is set to detect whether the output voltage of the generator has reached the second predetermined value of 14V. Also,
The timer (310) starts when the output voltage of the generator reaches 8V and outputs “I(gh
", and otherwise outputs "Low".

Next, the operation of this embodiment configured as described above will be explained.

When the key switch (6) is turned on, the power generation 14
(1) has also not started power generation, so the first and second comparators (308) and (309) are 'L o
w”, and the timer (310) is also “Low”. Therefore, at this time, the control transistor (315
) is “OIi” F” and the power transistor (317
) becomes "ON", and the initial excitation current flows to the field coil (+02) through the initial excitation resistor (6).

Driven by the engine, the power generator 1'4 (1) starts firing, and when the power generation voltage exceeds 8V, the timer (31
0) becomes “High” and time measurement starts. During the 10 seconds that this timer (310) is activated,
When the generated voltage exceeds IOV, the second comparator (3
09) becomes "High h", the control transistor (315) becomes "ON", and the power transistor (3
17) is turned “OFF” to suppress the rise in output voltage. Conversely, if the generated voltage is lower than IOV, the second comparator (309) becomes "Low", the control transistor (315) becomes "OFF", and the power transistor (317) is turned “ON” to suppress the drop in output voltage. These operations cause the timer (31
During the 10 seconds operating time of 0), the generator output electrons are IO
Adjusted to V.

Next, after the operation of the timer (310) ends, that is, after 10 seconds have elapsed, the timer (310) becomes "Low".
Therefore, the control transistor (315) is turned off.
Therefore, the power transistor (317) becomes "ON". Therefore, the field current increases and the generated voltage increases.

Then, when the generated voltage exceeds 14V, the first comparator (308) becomes "fl i g h", turns the control transistor (315) "ON", and turns the power transistor (317) "OFF". As a result, the field current is suppressed by 1 kll, and the rise in the generated voltage is suppressed. Also, conversely,
When the voltage of the first comparator (
308) becomes “Low”, and the control transistor (308) becomes “Low”.
15) is “OFF” and the power transistor (317)
turns “ON” and increases the field @ current, suppressing the drop in the output voltage. Through these operations, the generated voltage is adjusted to +4V.

As described above, in this embodiment, after the generator (1) starts generating electricity, the generator (1) generates electricity for 10 seconds and adjusts the voltage to a lower IOV than the battery voltage, so during this time, the generator (1)
is not output. After 10 seconds have passed since the start of power generation, the output voltage will be adjusted to 14V, which is higher than the storage voltage, and the system will shift to normal charging output operation.

In the above actual example, the operating time of the timer (310) was exemplified as 10 seconds, but the setting of this operating time can be changed as appropriate.

Furthermore, the present invention can of course be applied to vehicle generators other than the +2V system.

[Effect of the invention] As shown in below-L, according to this invention, immediately after starting the engine,
Cross 4. (Since the generator pressure is adjusted to a voltage lower than the storage battery voltage until a predetermined period of time has passed after the start of power generation for E generation, the generator output is 0 (A) during this time,
You can prevent it from being output at all. Therefore, it is possible to completely eliminate the load torque caused by the generator drive and to stabilize the engine idle rotation at an early stage.

Additionally, since the driving torque of the generator can be completely eliminated, the belt and pulley can be sufficiently adjusted during this time, and belt slip noise can be prevented in cold weather.

[Brief explanation of the drawing]

The figure is a circuit diagram showing an embodiment of a control device for a vehicle AC generator according to the present invention. (1) is an alternator, (+02) is a field coil, (2)
is a rectifier, (3) is a voltage regulator, (306) (307)
are voltage dividing resistors for generator output voltage detection, (308), (30
9) is a comparator, (310) is a timer (317
) is a power)/runnostar, and (4) is a storage battery.

Claims (1)

[Claims] (1) An alternating current generator having a field coil, a rectifier that rectifies the alternating current output of the alternator, a storage battery connected to the output end of the rectifier, and a switching element inserted in series with the field coil. and a voltage regulator that detects the terminal voltage of the rectifier or the storage battery, controls the field current intermittently by the switching element, and adjusts the output voltage of the alternator to a predetermined value. The output voltage of the alternator is adjusted to a first predetermined value lower than the storage battery voltage until a predetermined time has elapsed after the start of power generation, and after the predetermined time has elapsed, the output voltage of the alternator is adjusted to a second predetermined value higher than the storage battery voltage. A control device for a vehicle alternator, characterized in that the voltage regulator is provided with means for adjusting.