JPH0746898A - Charging generator for vehicle - Google Patents

Abstract

PURPOSE:To exhibit alarm function, external control function, and load response function sufficiently by imposing inhibition conditions to load response control. CONSTITUTION:In a rotation detecting circuit 21, output voltage of one phase of a generator, i.e., a signal at terminal P, is shaped by a shaper circuit 211 and the period thereof is measured by a period measuring circuit 213 thus detecting the r.p.m. A charge lamp is lighted when an engine stops with a key switch being turned ON and a charge lamp unlight signal 21A is generated when the stator begins to rotate and the r.p.m. rises abruptly after initial explosion. At that time, a load response inhibition signal 21B is also generated for a predetermined time. Since the load response control is inhibited for a predetermined time after initial explosion, the battery voltage does not drop resulting in a positive engine start.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle charging generator with a load response control (LRC) function that does not give a sudden torque load to an engine when an electric load is switched on, and an adjustment voltage from the outside. The present invention relates to a vehicle charging generator having a controllable function.

[0002]

2. Description of the Related Art Conventionally, automobiles are equipped with a generator to cover the electrical loads 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.

In recent years, a product with a load response control function of gradually increasing the output when an electric load is turned on and a device in which the adjustment voltage can be switched in two stages have appeared on the market.

The concept of load response control is disclosed in Japanese Patent Laid-Open No.
Although it is already known as shown in Japanese Patent No. 76512,
For example, as described in Japanese Patent Laid-Open No. 62-64299, when the engine is idle, the current flowing through the field winding is prevented from increasing rapidly when the battery voltage drops below a predetermined value. It is known to control.

[0005]

However, in the above-mentioned 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 of combining them are mentioned. There wasn't.

It is an object of the present invention to clarify which function is prioritized or prohibited when the above functions are combined.

[0007]

In order to solve the above problems, in the present invention, the LRC at the time of starting, the LRC outside the B terminal, and the adjustment voltage control by an external signal are controlled by the LRC control. I give it priority.

[0008]

By inhibiting the LRC when the engine is started, the battery voltage immediately after the start does not drop and the engine can be started reliably.

By inhibiting the LRC when the B and S terminals of the alternator are disconnected, the LRC is set in the auxiliary detection mode.
Prevents the alarm operation from being stopped due to the power generation stoppage.

By inhibiting the LRC when the command signal of the adjustment voltage is received from the outside, the response to the command signal is improved.

[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 the rotating shaft of the engine via a belt and rotates in synchronization with the rotation of the engine to generate a rotating magnetic field.

Further, a flywheel diode 14 for absorbing switching noise is provided in parallel with the field winding 13.
Are 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 the charging generator 1.
Is supplied to the battery 2 via the output terminal "B" of the battery 2 and the battery 2 is charged. At the same time, the three-phase full-wave rectifier 1
The output of 2 is supplied from this output terminal “B” to the electric load 3 via the switch 4.

An adjustment voltage command signal is input to the regulator 7 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. There is. 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 the deviation signal output circuit 20 together with the output of the set voltage circuit 19 that generates the reference voltage. The deviation signal output circuit 20 calculates and outputs the deviation between the battery voltage detected by the voltage detection circuit 18 and the reference voltage set by the set voltage circuit 19.

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

As described above, the changing speed of the field current is suppressed to prevent abrupt 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 gives a no-power-generation alarm when no signal is received from the generator rotation detection circuit 21, 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 output voltage of one phase 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, and when the starter starts rotating and the engine detects that the engine speed has risen sharply after the initial explosion, the charge lamp turn-off signal 21A is output. generate. At this time, the load response prohibiting signal 21B is simultaneously generated for a fixed time. Usually, the battery voltage becomes higher after power generation than before power generation by the generator, so that in a generator with a load response function, the voltage deviation suddenly opens and the load response control operates. In this case, as shown in FIG. 3- (a), it takes time for the voltage to reach its original value, and various actuators must correct the voltage when the engine is still unstable at the time of starting, and there is a risk of engine stall. There is. But,
By prohibiting the load response control for a fixed time after the initial explosion as in the present embodiment, the battery voltage immediately returns to its original value as shown in FIG. 3- (b). The anxiety disappears.

In this embodiment, the rotation detection is performed by detecting the frequency of the P terminal signal, but the rotation detection can be performed to some extent even 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 resistance-divided and input to the detection voltage changeover switch 188. Normally, the voltage of the S terminal is prioritized and detected and used as the reference for the adjustment voltage, but if the B terminal is disconnected for some reason, the battery and the electric load are disconnected, so the S terminal voltage continues to drop and the B terminal voltage becomes Since it is not controlled and continues to rise, the detection voltage is switched by the overvoltage detector 187 to the B terminal which is the output voltage of the generator and the charge lamp is turned on. This state is very unstable, and if the load response control is mistakenly turned on, the output voltage will be throttled by itself, and since there is no battery, the output voltage will suddenly drop to 0 V and the regulator power supply itself will drop, and an alarm can be issued. Disappear. In the present invention,
In this state, the load response control prohibition signal is issued at the same time as the charge lamp is turned on to prevent the load response control from being reliably turned on, thereby preventing the occurrence of the above problem.

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

FIG. 6 is a diagram for explaining the inside of the load response control circuit 10. The change in voltage deviation is determined by the voltage deviation change speed detection circuit 102, and if it is equal to or more than a certain 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 even 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 remains “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]

As is apparent from the above description, by adding a prohibition condition to the load response control of the present invention, an alarm function, an external control function, a load response can be obtained without impairing the conventional functions such as engine stability. It becomes possible for each of the functions to fully exhibit the originally intended function.

[Brief description of 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 prohibiting circuit at the time of starting according to the first embodiment of the present invention and an explanatory view 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 an embodiment of the present invention.

[Explanation of symbols]

1 ... Charge 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
... regulated reference voltage generation circuit, 20 ... deviation signal output circuit, 23 ... alarm circuit, 24 ... current command value changeover switch, external signal processing circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication location H02J 7/24 E 4235-5G H02P 9/14 H 9178-5H (72) Inventor Kenichi Watanabe Ibaraki prefecture 2520 Takaba, Takata, Hitachi, Ltd., Automotive Equipment Division, Hitachi, Ltd. (72) Inventor, Ei Hikida 2477 Kashima Yatsu, Takata, Katsuta, Ibaraki Prefecture 3 Hitachi Automotive Engineering Co., Ltd.

Claims (5)

[Claims] 1. A field winding that rotates by an engine rotation to create a rotating magnetic field, an armature winding that receives the rotating magnetic field to generate a current and charges a battery through a rectifier, and a voltage of the battery or Comparing means for comparing the voltage of the rectifier with a predetermined value, and current control means for controlling the field current supplied to the field winding based on the output of the comparing means,
A vehicle charging generator that performs load response control when a load is applied is characterized by having a function that prohibits the load response control for a certain period of time after the initial explosion when the engine is started and the rotation speed is above a certain speed. Vehicle charging generator. 2. A field winding that rotates by an engine rotation to create a rotating magnetic field, an armature winding that receives the rotating magnetic field to generate a current and charges a battery through a rectifier, and a voltage of the battery or In a vehicle charging generator having a comparing means for comparing the voltage of the rectifier with a predetermined value and a current controlling means for controlling the field current supplied to the field winding based on the output of the comparing means, charging power generation A vehicle charging generator, which is provided with a function of prohibiting load response control when it is detected that the output current terminal of the machine is disconnected. 3. A field winding that rotates due to rotation of an engine to generate a rotating magnetic field, an armature winding that receives the rotating magnetic field to generate a current and charges a battery through a rectifier, and a voltage of the battery or In a vehicle charging generator having a comparison means for comparing the voltage of the rectifier with a predetermined value, and a current control means for controlling the field current supplied to the field winding based on the output of the comparison means, from the outside, A vehicle charging generator, which is provided with a function of prohibiting load response control when a command signal of an adjustment voltage is received. 4. A charging generator for a vehicle according to claim 3, wherein the command signal of the adjustment voltage coming from the outside determines the adjustment voltage value in accordance with the conduction ratio for every constant period. 5. The charging generator according to claim 2, wherein when it is detected that the output current terminal of the charging generator is disconnected, the output voltage of the charging generator is directly controlled. Vehicle charging generator.