JPH0767261B2 - Output current detector for vehicle generator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of an output current detection device for a vehicle generator, which detects an output current of a generator used particularly for an automobile.

[Prior Art] Generally, a generator for an automobile is mounted for the purpose of charging a battery and supplying electric power to an electric load, and its generated voltage is a battery open terminal voltage (about 12.8
V) is always set to a higher value (for example, 14.5V).

However, in recent years, by detecting the output state of the generator and changing the generated voltage to reduce the power consumption of the generator to improve the fuel consumption of the vehicle and to detect the increase in the generator output during idle operation, the idle state is detected. A system for improving idle operation and improving charging balance as a charging system is being adopted. (For example, JP-A-59-
(Problem to be solved by the invention) However, in the above-mentioned conventional device, a shunt resistor or the like is used as the output current detection means of the system, but there are problems such as installation space and power loss. There is.

[Means for solving problems]

Therefore, the present invention is connected to a cooling fin for a rectifying device of a vehicle AC generator, and a DC voltage output terminal for charging an output of the AC generator rectified by the rectifying device to a vehicle battery. An output current for a vehicle generator, which is provided on the outer periphery of the DC output terminal and in an insulating member for insulating the DC output terminal, and which has a magnetic sensor for detecting a current flowing through the DC output terminal. It is to be a detection device.

[Action]

A current detection device for detecting an output current is incorporated in the output terminal of the generator, and the output current is detected from the magnetic flux generated at the output terminal.

〔The invention's effect〕

As described above, in the present invention, the current detector for detecting the output current of the vehicular generator is inserted in the insulating bush used to insulate the output terminals of the vehicular generator. As a result, it is possible to provide a small-sized and low-cost output current detector, and it is possible to reduce the number of parts when the vehicle is assembled by being housed in the vehicle generator.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. 1 to 3, an output terminal bolt 1 forming a DC voltage output terminal has a screw portion 1a at one end for connecting to an external terminal, and a plate in surface contact with an arcuate fin 2 at the other end. And part 1b. Further, the fins 2 and the plate portion 1b are positioned by the concave-convex fitting or the like. And
Through holes 1c and 2a are formed in the center of the plate portion 1b and the fin 1, respectively. Further, an insulating terminal block 4 covering the inner peripheral side and the upper side of these through holes 1c, 2a is arranged.

A through hole 4a extending in the axial direction is formed in the center of the terminal block 4. Further, an arcuate fin 6 is arranged below the fin 2 via an insulator 5.
Also, in the center of the insulator 5 and the fin 6,
Through holes 5a and 6a are formed so as to match the through holes 4a of the terminal block 4. Then, the through holes 4a, 5a, 6a are aligned, and the terminal block 4, the output terminal bolt 1, the fin 2, the insulator 5, and the fin 6 are integrally fixed through the pipe rivet 3. After that, the hole 10a of the rivet 3 is passed through the bolt 10 that is driven into the rear frame 8 and is fixed to the rear frame 8 by the nut 23 together with the rear cover 9. Then, the rear cover 9 covers the fins 2 and 6.

The frame 8 has a U-shaped recess 8a for taking out the output terminal bolt 1. Similarly, the rear cover 9 has a recess 9a for taking out the output terminal bolt 1.
Are formed.

The insulating bush 7 is made of resin, for example, and insulates the output terminal bolt 1 from the frame 8 and the rear cover 9. The insulating bush 7 has a hole 7a formed at the center thereof, through which the output terminal bolt 1 passes. Further, a U-shaped curved surface portion 7b that abuts the U-shaped concave portion 8a of the frame 8 is formed at one end. Furthermore, 7c is provided at the other end.

The output current detector 11 is housed in an insulating bush 7 which insulates the rear frame 8 and the rear cover 9 from each other, as shown in FIG. Reference numeral 11a denotes a current detection unit for detecting an output current, and a magnetic path 11a1 made of a magnetic body for passing a magnetic flux generated by the output current flowing through the output terminal bolt ₁ and a magnetic-electric conversion for converting the magnetic flux into an electric signal. Element 11a ₂ (for example,
Hall element, magnetoresistive element, etc.). Further, as shown in FIGS. 3 to 4, the other end of the rotary shaft (also referred to as a shaft) 12 of the rotor is accommodated, and the other end is integrally formed with a slip ring 13, and the slip ring 13 is integrally formed.
A brush 14 is slidably engaged with each of them.

Furthermore, the rear frame 8 is placed in the space with the rear cover 9
A regulator 15 and a brush holder 16 are provided, the regulator 15 is fixed to the rear frame 8 with a screw 17, and is electrically connected to a cooling fin with a screw 18, and with the screws 19 and 20, they are electrically connected to each other protruding from the brush holder 16. Are electrically connected to the metal fittings 21 and 22 insulated from each other.

Although not shown, the metal fittings 21 and 22 are brush holders.
It is insert-molded in 16 and is electrically connected to each brush 14.

The case cover 15a of the regulator 15 is provided with fins serving as uneven portions for heat dissipation.

In FIG. 5, 31 is a battery and 32 is an electric load, for example, a starter, a headlight, a fan heater or the like. A vehicle generator 33 includes an AC generator, a rectifier, a regulator, an output current detector, and a resin terminal section. An AC generator 34 is driven by an engine (not shown) and includes a field winding 34a and an armature winding 34b. Reference numeral 35 is a rectifier constituted by the cooling fins 2b, which rectifies the output of the AC generator 34 and supplies electric power to the battery 31 and the electric load 32. Reference numeral 11 is an output current detector as described above. Reference numeral 15 is a regulator as described above, which is operated by the voltage of the battery 31 or the vehicle generator 33.
Of the voltage and the output signal of the output current detector 11 are input, the energizing current of the field winding 34a is controlled under predetermined conditions, and the output of the vehicle generator 33 is controlled. 37a is a transistor connected in series to the field winding 34a, 37b is a diode connected in parallel to the field winding 34a, 37c and 37d are the battery 31 or the vehicle generator 33.
, A series resistor connected in parallel with 37e is compared with the divided voltage of the resistors 37c and 37d and the reference voltage V _2, and when the divided voltage is low,
Comparator that outputs "Hi" signal, 37f is output current detector 11
The amplifier that amplifies the output signal of the, 37g is input to the output signal of the amplifier 37f, and the increase detection circuit that outputs the "Hi" signal when the increase dv / dt of the output signal exceeds the set value, 37h is the AC generator An F-V conversion circuit that detects a one-phase voltage (pulse signal) of 34 and converts the frequency of the signal into a voltage, 37i is the F-
Comparing the output voltage with the reference voltage V ₁ of the V conversion circuit 37h, the when the output voltage of the F-V conversion circuit 37h is low, i.e., outputs "Hi" signal when E / G rotational speed of the vehicle is equal to or less than the set value 37j is a NAND gate for inputting the output signals of the increase amount detection circuit 37h and the comparator 37i, 37h is an AND gate for inputting the output signals of the comparator 37e and the NAND gate 37j, and driving the transistor 37a, 37l Is a constant voltage power supply circuit that receives the voltage of the battery 31 and supplies a constant voltage (for example, 8 V) as a circuit power supply in the regulator. Reference numeral 38 is a key switch of the vehicle or a switch which operates in conjunction with the key switch to supply a power supply voltage to the regulator 15. A resin terminal 39 has a connection terminal for the regulator 15, the AC generator 34, the rectifier 35, the output current detector 11, the switch 38, the battery 31, etc.

The operation will be described with the above configuration. Key switch
When 38 is turned on and an engine (not shown) is driven, the field winding 34a of the AC generator 34 is rotated. At this time, the regulator 15 uses the comparator 37e to determine whether or not the voltage of the battery 31 is below a set value (eg (14.5V) or less, and if it is below the set value, the transistor 37a is turned on via the AND gate 37k. Then, when the transistor 37a is turned on, the field current If flows through the field winding 34a and the AC generator 34 starts power generation.

The output of the AC generator 34 is rectified by the rectifier 35, and current flows through the output terminal 1 to charge the battery 31 and supply electric power to the electric load 32. At this time, the output current detector 11 outputs a voltage equal to the output current, the output voltage is increased by the amplifier 37f, and the F-V conversion circuit 37h is output.
Inputs the one-phase voltage of the AC generator 34 as a pulse signal,
The frequency of the signal is converted to a voltage. The comparator 37i is the F
From the output voltage of the −V conversion circuit 37h and the reference voltage V ₁ , the rotation speed of the AC generator 34 and the rotation speed of the engine linked to the AC generator 34 are set values (for example, 2000 rpm in the engine rotation speed).
m) Determine if it is less than or equal to: When the engine speed is equal to or lower than the set value and the output of the increase amount detection circuit 37g is `` Hi '', that is, when the increase amount of the output current of the vehicle generator 33 is equal to or higher than the set value, the output of the NAND gate 37j is `` LOW ”, the transistor 37a is cut off through the AND gate 37h, and the battery
Even if the voltage of 31 is below the set value, if the engine speed is below the predetermined value, the output current is gradually increased so as not to exceed the set value.

Next, the engine speed is equal to or higher than a set value (for example, 2000 rpm or higher), that is, the output of the FV conversion circuit 37h is the reference voltage V ₁
When the output of the comparator 37i is “LOW”, the NAND gate 3 is irrelevant regardless of the output signal of the increase amount detection circuit 37g.
Since the output of 7j becomes "Hi", the operation of the transistor 37a is said to be conductive when the voltage of the battery 31 is lower than the set value and cut off when the voltage of the battery 31 is high, regardless of the increase amount of the output current of the vehicle generator. Take action.

Further, in the present invention, the control function of the vehicle generator is integrated by integrally assembling the AC generator, the rectifier, the regulator, and the output current detector as the vehicle generator, and the external wiring can be reduced. .

Also, a signal in the vehicle generator (for example, a one-phase voltage of the AC generator for detecting the rotation speed, V _CE of the transistor 7a for detecting the operating state of the transistor 7a, an output current detector for detecting the output current). Output signal, etc.) to the outside or a request to change the shape of the external connector can be dealt with only by changing the resin terminal portion.

[Brief description of drawings]

FIG. 1 is a sectional view showing a main part of a vehicle AC generator to which an output current detection device for a vehicle generator of the present invention is applied, and FIG.
FIG. 3 is a cross-sectional view of the magnetic sensor in the figure, FIG. 3 is a front view showing a state in which the rear cover of the vehicle alternator in FIG. 1 is removed, and FIG. 4 is a front view showing a state in which the rear cover is covered in FIG. FIG. 5 is an electric circuit diagram showing the vehicle AC generator and the voltage regulator shown in FIG. 1 ... Output terminal bolt, 2 ... Fin, 6 ... Fin, 7 ... Insulation bush, 11 ... Magnetic sensor, 15 ... Regulator.

Claims (1)

[Claims] 1. A DC voltage output terminal for connecting to a cooling fin for a rectifying device of an automotive alternator and for charging an automotive battery with an output obtained by rectifying an AC generator output by the rectifying device. An output current detector for a vehicle generator, which is arranged on the outer periphery of the DC output terminal and in an insulating member for insulating the DC output terminal, and which includes a magnetic sensor for detecting a current flowing to the DC output terminal. apparatus.