JPS63206126A - Voltage regulator of vehicle charging generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a voltage regulating device for a vehicle charging generator, and more particularly to a voltage regulating device that operates to reduce the load on the engine during low speed rotation.

[Prior Art] A vehicle charging generator is connected to the engine and rotates.
When generating electricity, it places a heavy burden on the engine.

The power generation of the charging generator is controlled by a voltage regulator, which turns on and off the rotor coil current of the charging generator so that the battery charging voltage is always constant.
It's in control.

By the way, when a relatively large electrical load is applied when the engine is rotating at low speed, such as when idling, the voltage regulator rapidly increases the energization rate of the rotor coil current in order to keep the battery charging voltage constant, placing a large burden on the engine. This may cause the engine to stall.

As one way to solve this problem, for example,
Publication No. 600 describes a system that detects when the battery charging voltage drops by a certain amount or more due to the application of a large electrical load.
The subsequent increase rate of rotor coil current is suppressed to a constant rate,
A voltage regulation device has been proposed that prevents an excessive load from being placed on the engine.

[Problems to be Solved by the Invention] However, in the conventional device described above, the power generation of the charging generator is not suppressed at all until the battery charging voltage drops by a certain amount, so the rapid increase in rotor coil current during this period may cause engine stall. may occur. For example, an increase in the electrical load within the power generation capacity of the charging generator does not cause a decrease in the battery charging voltage, so the rotor coil current increases rapidly without being suppressed.

The present invention solves this problem, and is capable of regulating the voltage of a vehicle charging generator that can always prevent a sudden increase in rotor coil current regardless of the level of battery charging voltage, thereby preventing the occurrence of engine stall. The purpose is to provide equipment.

Means for Solving Problem U] To explain the configuration of the present invention with a diagram, the voltage regulator 1 controls the current of the rotor coil 21 of the vehicle charging generator 2 from ON to OFF.
It has a switch means 11 that performs F control to maintain the battery charging voltage at a predetermined value.

The voltage regulator 1 further includes a current detection means 12 that detects the output current of the charging generator 2 and generates an output signal 12a proportional to the current value, and detects an increase in the output signal 12a so that the increase is constant. an increase detecting means 14 which issues a power generation stop signal 14a when the value exceeds a certain value, and an increase detection means 14 which detects the engine rotational speed and when the rotational speed is below a certain value, gives the power generation stop signal 14a to the switch means It is equipped with rotation speed detection means 15 for turning off the rotation speed.

[Operations and Effects] In the voltage regulator 1 having the above configuration, when the electrical load increases, the switch means 11 is immediately turned ON to supply current to the rotor coil 21 in order to maintain the battery charging voltage at a predetermined value. Accordingly, the output current of the charging generator 2 increases rapidly. The output current is detected by the current detection means 12, and when the increase amount exceeds a certain value, the increase amount detection means 14 outputs a power generation stop signal 14a.

In this state, when the engine speed is below a certain value, such as when the engine is idling, the speed detecting means 15 gives the power generation stop signal 14a to the switch means 11 to turn it off.

Thereafter, when the engine speed is low, the switch means 11 is turned off by the power generation stop signal 14a every time the increase in the output current exceeds a certain value, and as a result, the rotor coil current increases when the engine speed is low. The rate is suppressed within an appropriate range, reducing the load on the engine.

In this way, engine stall is prevented.

[Example] An example of the present invention will be described with reference to the drawings. Voltage regulator 1
has a transistor 11 as a switching means, which transistor 11 connects the rotor coil 21 of the vehicle charging generator 2.
ON-OFF control of the excitation current of the stator coil 22
Adjust the amount of power generated.

The generated output of the stator coil 22 is rectified by the full-wave rectifier 23, and the battery is charged! 31 and is supplied to the battery 3 and the electric load 5.

The charging voltage of the battery 3 is fed back to the voltage regulator 1 via the sensing line 32, divided into resistors, and input to the comparator 17. The comparator 17 ratios the feedback voltage to the reference voltage VS, and controls the operation of the transistor 11 via the AND gate 18 using the ratio output 17a. In this way, the battery charging voltage is maintained at a constant value regardless of fluctuations in the power generation capacity of the charging generator 2 or fluctuations in the electric load 5.

A current detector 12 is provided in the middle of the battery charging line 31, and the current detector 12 uses, for example, a Hall element that emits an output according to the strength of the magnetic field around the charging line.
It emits an output signal 12a proportional to the output current in 1. The output signal 12a is input to the increase detection circuit 14 via the amplifier 13.

The increase amount detection circuit 14 detects the amount of increase in the output signal 12a, and when this exceeds a certain value (for example, IOA/sec), it issues a power generation stop signal 14a.

The power generation stop signal 14a is input to a NAND gate 19.

An F/V conversion circuit 15 is provided, and the one-phase output of the stator coil 22 is input to the circuit 15.

The F/V conversion circuit 15 shown in L emits an output 15a according to the frequency of the negative phase output, and this output 15a is transmitted to the rotor coil 2.
1 rotation speed, that is, it is proportional to the engine rotation speed.

The above output 15a is input to the comparator 16 to provide a constant voltage V
When the constant voltage Va becomes lower than the constant voltage Va (for example, when the engine speed is 200 Orpm or less), the comparator 16 outputs a "1" level output and the NAND gate 19 opens.

In the figure, 17 is a constant voltage circuit that supplies operating power to each circuit element of the voltage regulator, and is connected to the battery 3 via the key switch 4.

In the voltage regulator having the above configuration, when the switch 5 is turned on and the large electrical load 5 is connected to the battery 3,
The voltage regulator 1 turns on the transistor 11 using the comparison output 17a of the comparator 17 to supply current to the rotor coil 21 in order to prevent the battery charging voltage from decreasing. As a result, the output current of the charging power generation fi2 is rapidly increased, and a sufficient current is simultaneously supplied to the electric load 5, thereby preventing the battery charging voltage from decreasing.

Now, when the engine rotates at low speed, the sudden increase in the rotor coil current places a large burden on the engine. Here, in the voltage regulator of this embodiment, when the engine speed is low, the NAND gate 19 is opened by the output of the comparator 16, and the power generation stop signal 14a outputted due to the increase in the output current is output as a "0" level output. The signal is applied to the AND gate 18 to forcibly turn off the transistor 11, thereby suppressing an excessive increase in the output current.

Thereafter, the operation of the transistor 11 is controlled by the power generation stop signal 14a, and the output current of the charging generator 2 is increased at an appropriate increase rate.

As a result, engine stalling during engine idling is prevented.

When the engine speed increases, the output of the power generation stop signal 14a is prohibited, or when sufficient current is supplied to the electric load 5 and the battery charging voltage is restored, the power generation stop signal 14a is inhibited.
is resolved, the transistor 11 is again controlled by the comparison output 17a of the comparator 17.

[Brief explanation of the drawing]

The figure is a circuit diagram of a voltage regulator showing an embodiment of the present invention. 1...Voltage regulator 11...Transistor (switch means) 12...Current detector (current detection means) 14...Increase amount detection circuit (
Increase amount detection means) 15...F/V converter (rotation speed detection means) 2...Vehicle charging generator 21...Rotor coil 3...Battery 31...Battery charging line 5... electrical load

Claims (1)

[Claims] In a voltage regulator having a switch means for controlling ON-OFF the rotor coil current of a vehicle charging generator to maintain the battery charging voltage at a predetermined value, the output current of the charging generator is detected and an output proportional to the current value is provided. current detection means for emitting a signal; increase amount detection means for detecting an increase in the output signal and issuing a power generation stop signal when the increase exceeds a certain value; A voltage regulating device for a vehicle charging generator, comprising rotation speed detection means for applying the power generation stop signal to the switch means to turn it off when the power generation stop signal is below the specified value.