JP3313471B2 - Vehicle charging generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging generator for a vehicle having a load response control (LRC) function that does not apply a sudden torque load to an engine when an electric load is switched on.

[0002]

2. Description of the Related Art Conventionally, a motor generator is mounted on an automobile to cover an electric load of lamps and actuators. This generator generally rotates a field winding by using a part of a driving torque generated by an engine, generates electric power by a rotating magnetic field generated by the field winding, and maintains a voltage of a battery at a predetermined value. Is controlled as follows.

[0003] In recent years, a device with a load response control function for gradually increasing the output when an electric load is applied and a device with an adjustable voltage that can be switched in two stages have appeared on the market.

[0004] The concept of load response control itself is disclosed in
Although it is already known as shown in JP 76512,
For example, as described in Japanese Patent Application Laid-Open No. 62-64299, when the engine is idling and the battery voltage falls below a predetermined value, a sudden increase in the current flowing through the field winding is suppressed. Is known.

[0005]

However, in the above prior art, the load response function, the alarm function, and the adjustment voltage switching function by an external signal are treated as separate functions, and the harmful effects when combined are mentioned. Did not.

[0006] The present invention relates to conventional functions such as engine stability.
Alarm function, external control function,
Each of the load response functions fully demonstrates its intended function
To provide a vehicle charging generator that can
You .

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The present invention generates a rotating magnetic field by receiving rotation of an engine.
Field winding and an electric machine that generates electric power by receiving the rotating magnetic field
And an armature winding and a battery or an electric load from the armature winding.
A rectifier for rectifying the supplied electric power and supplying the electric power to the field winding
Vehicle charge having a current regulator for controlling a changing field current
In the electric power generator, the current regulator is provided for the battery.
The voltage or the voltage of the rectifier is compared with a predetermined value.
Current control means for controlling the field current based on the comparison result
When the load is turned on, sudden output torque fluctuation does not occur.
Control the current control means and inhibit load response control.
If a stop signal is received, the load response
Control means for controlling the driving of the alarm device of the vehicle.
The rotation speed exceeds a certain speed after the first explosion when starting the engine
For a certain period of time, or when the output terminal of the rectifier
Disconnection is detected or the battery voltage is
The load response control when detecting that the detection terminal has come off;
Alarm device driving means for generating a prohibition signal and external command
Switching the predetermined value based on the external command.
The load response control prohibition signal is generated when
And a signal processing unit.

[0008]

According to the present invention, than it is possible to inhibit the LRC when the engine is started, there is no drop in the battery voltage immediately after the start, you cause I row reliable engine start
Can be .

According to the present invention, the alternator B
Terminals, making it possible to prohibit the LRC when the S terminal out
The wear of, it is possible to prevent the LRC that is no longer able to alarm operation becomes the power generation stop working in the auxiliary detection mode
You .

Further , according to the present invention , LRC can be inhibited when an adjustment voltage command signal is received from the outside.
Than that, it is possible to improve the responsiveness to the command signal
You .

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system configuration diagram showing a charging system of an automobile. The charging generator 1 driven by the engine will be described. The field winding 13 is connected to a rotating shaft of the engine via a belt, and rotates in synchronization with the rotation of the engine to generate a rotating magnetic field.

A flywheel diode 14 for absorbing switching noise in parallel with the field winding 13
Is connected.

The armature winding 11 is provided close to the field winding 13 and outputs a voltage having an AC waveform according to the magnitude of the rotating magnetic field generated by the field winding 13. The AC output of the armature winding 11 is efficiently rectified by the three-phase full-wave rectifier 12. The output of the three-phase full-wave rectifier 12 is
Is supplied to the battery 2 through the output terminal “B” of the battery, and the battery 2 is charged. At the same time, the three-phase full-wave rectifier 1
The output 2 is supplied from the output terminal “B” to the electric load 3 via the switch 4.

The regulator 7 receives an adjustment voltage command signal from an external control unit 8.

FIG. 2 shows the internal circuit configuration of the regulator 7.

The power supply circuit 15 is for supplying a constant voltage power to each circuit of the regulator 7, and is connected to the output terminal "B" of the output of the three-phase full-wave rectifier 12 to generate a constant voltage. I have. Further, the battery voltage detection terminal “S” is connected to the voltage detection circuit 18. The output of the voltage detection circuit 18 is input to a deviation signal output circuit 20 together with the output of a setting voltage circuit 19 for generating a reference voltage. The deviation signal output circuit 20 calculates and outputs a deviation between the battery voltage detected by the voltage detection circuit 18 and the reference voltage set by the setting voltage circuit 19.

The output of the deviation signal output circuit 20 is input to the load response control circuit 10, and the load response control circuit 10 operates the switch 24 if the rate of change of the deviation signal is within a specified value. Is sent to the current control circuit 16 as it is, but if the rate of change of the deviation signal is equal to or greater than the specified value, the switch 24 is switched to switch the load response control circuit 1
A command value that gradually increases from 0 at regular intervals is sent to the current control circuit 16.

As described above, the changing speed of the field current is suppressed to prevent a sudden output torque fluctuation. The current control circuit 16 controls the current flowing through the field winding 13 in proportion to the current command value.

The charge lamp drive circuit 22 issues a no power generation alarm when a signal from the generator rotation detection circuit 21 does not come, and receives a signal from the alarm circuit 23 to turn on the charge lamp.

Next, the first embodiment will be described with reference to FIG.
First, the rotation detection circuit 21 waveform-shapes (211) the signal at the P terminal, which is the one-phase output voltage of the generator, and measures the period (2).
13) to detect the rotation speed. When the key switch is ON and the engine is stopped, the charge lamp is turned on. When the starter starts to rotate and the engine detects that the engine speed suddenly rises after the first explosion, the charge lamp extinguishing signal 21A is output. generate. At this time, the load response prohibition signal 21B is simultaneously generated for a predetermined time. Normally, the battery voltage becomes higher after power generation than before power generation by the generator. Therefore, in a generator having a load response function, a voltage deviation sharply opens and the load response control operates. In this case, as shown in FIG. 3A, it takes time until the voltage reaches the original value, and when the engine at the time of starting is still unstable, various actuators have to perform voltage correction, and there is a danger of engine stall. There is. But,
By prohibiting the load response control for a certain period of time after the first explosion as in the present embodiment, the battery voltage immediately returns to its original value as in the prior art as shown in FIG. Fear is gone.

In this embodiment, the rotation is detected by detecting the frequency of the P terminal signal. However, the rotation can be detected to some extent by judging the voltage level of the P terminal signal.

Next, a second embodiment will be described with reference to FIG. The S terminal voltage and the B terminal voltage are each divided by resistance and input to the detection voltage switch 188. Normally, the voltage of the S terminal is detected with priority and is used as the reference for the adjustment voltage. However, if the B terminal is disconnected for any reason, the battery and the electric load are cut off, so that the S terminal voltage continues to decrease and the B terminal voltage becomes The control voltage is switched to the terminal B, which is the output voltage of the generator, by the overvoltage detector 187 so that the charge lamp is turned on. This state is very unstable, and if the load response control is wrongly turned on, the output voltage will drop down to 0V because there is no battery, and the power supply of the regulator itself will be dropped because there is no battery. Disappears. In the present invention,
In this state, a load response control prohibition signal is output at the same time when the charge lamp is turned on to prevent the load response control from being reliably activated, thereby preventing the above-described problem.

Next, a third embodiment will be described with reference to FIG. The external signal processing circuit 25 receives the signal of the external control unit, shapes the waveform by the comparator 252, converts the signal into a regulated voltage command value corresponding to the duty ratio of the signal, and at the same time the input signal is within the effective frequency. If it is determined that the output is valid, the output of the regulated reference voltage generating circuit 19 is switched from a normal reference voltage to a reference voltage corresponding to an external signal. At this time, when the command value of the external signal is changed according to the driving state of the vehicle, a quick response is required, and if load response control is performed in some cases, a problem occurs in that necessary torque control cannot be performed. According to the present invention, the load response control is prohibited when the regulation voltage command is received from the outside, so that the above-described problem does not occur.

FIG. 6 is a diagram for explaining the inside of the load response control circuit 10. The change in the voltage deviation is determined by the voltage deviation change speed detection circuit 102. If the voltage deviation is equal to or more than a predetermined value, it is determined that the load is applied, and the load response control signal 10A is output according to the time cycle of the time generation circuit 104. When at least one signal is input to the load response control prohibition determination circuit 101, the output of the determination circuit 101 becomes “L”, and the output of the AND circuit 105 is “L” even if the voltage deviation change speed detection circuit 102 detects LRC. L ", and the voltage deviation switching signal 10B is not output.

[0026]

According to the present invention, each of the alarm function, the external control function, and the load response function is originally intended without impairing the conventional functions such as engine stability by setting the prohibition condition on the load response control. It is possible to fully demonstrate the function to perform.

[Brief description of the drawings]

FIG. 1 is an overall system configuration diagram of a vehicle charging generator.

FIG. 2 is a circuit block diagram of a regulator of the control system.

FIG. 3 is a configuration diagram of a load response prohibition circuit at the time of starting according to the first embodiment of the present invention and an explanatory diagram of effects of the embodiment.

FIG. 4 is a configuration diagram of a battery voltage detection circuit according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of an external signal processing circuit and a regulated reference voltage generation circuit according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a load response control circuit according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Charging generator, 2 ... Battery, 3 ... Electric load, 6 ... Charge lamp, 7 ... Regulator, 11 ... Armature winding,
12 ... three-phase full-wave rectifier, 13 ... field winding, 14 ... flywheel diode, 15 ... power supply circuit, 16 ... current control circuit, 17 ... time generation circuit, 18 ... voltage detection circuit, 19
... Regulation reference voltage generation circuit, 20 ... Deviation signal output circuit, 23 ... Alarm circuit, 24 ... Current command value changeover switch, External signal processing circuit.

──────────────────────────────────────────────────の Continuing on the front page (51) Int.Cl. ⁷ Identification symbol FI H02J 7/24 H02J 7/24 E H02P 9/14 H02P 9/14 H (72) Inventor Sakae Hikita Oaza Takabata Katsuta City, Ibaraki Prefecture 2477 Kashima Yatsu 3 Hitachi Automotive Engineering Co., Ltd. (56) References JP-A-3-93500 (JP, A) JP-A-57-148541 (JP, A) JP-A-60-144117 (JP) , A) Japanese Utility Model 3-11400 (JP, U) Japanese Utility Model 5-88157 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02P 9/04 H02P 9/14 H02J 7/14 H02J 7/16 H02J 7/24

Claims (3)

(57) [Claims] 1. A rotating magnetic field is generated by receiving rotation of an engine.
Field winding and an electric machine that generates electric power by receiving the rotating magnetic field
Armature winding and the armature winding to the battery or electric load
A rectifier for rectifying the supplied power;
For a vehicle having a current regulator for controlling a field current to be supplied
In the charging generator, the current regulator includes the battery
And the voltage of the rectifier is compared with a predetermined value.
A current control means for controlling the field current based on the comparison result
No sudden change in output torque when load is applied
Controlling the current control means and controlling the load response.
Load that prohibits load response control when receiving a prohibition signal
Control the response control means and the driving of the alarm device of the vehicle.
The rotation speed exceeds a certain speed after the first explosion when starting the engine
For a certain period of time, or when the output terminal of the rectifier
Disconnection is detected or the battery voltage is
The load response control when detecting that the detection terminal has come off;
Alarm device driving means for generating a prohibition signal and external command
Switching the predetermined value based on the external command.
The load response control prohibition signal is generated when
Charge for a vehicle, comprising: a signal processing unit;
Generator. 2. A vehicle charging generator according to claim 1, wherein
The external signal processing means may include a predetermined period of the external command.
Wherein the predetermined value is determined according to the flow rate of each
Vehicle charging generator. 3. The vehicle charging generator according to claim 1, wherein :
When it is detected that the output terminal of the rectifier has come off,
Directly controlling the output voltage of the rectifier
Vehicle charging generator.