JPH08277767A - Generator for vehicle - Google Patents

Abstract

PURPOSE: To lessen the load of a starter at the time of start so as to improve startability by stopping a voltage control circuit for switching a charge lamp from on state to off state in the case that the voltage generated by an alternator gets over the specified voltage, for a specified time at the time of start of an engine. CONSTITUTION: When an ignition switch 7 is turned on at the start of an engine, a power unit 4 starts to operate, and the a transistor TR5 is turned on, and the power circuit of a voltage control IC5 exhibits the function, and keeps the voltage of an L terminal at specified voltage. Next, when the key switch is rotated further to turn on the start switch 13, a relay switch 11 is excited, and a contact piece 12 is changed over to ground side, and the L terminal of the power unit 4 is earthed. As a result, the voltage of the L terminal drops to 0 voltage, which turns off the TR5, and changes the voltage control IC5 into nonworking condition, and lights only the charge lamp 8, thus the power unit 4 does not become load to the starter 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular power generator suitable for reducing the load on a starter when a remote engine starter is used to remotely start an engine.

[0002]

2. Description of the Related Art A conventional vehicle power generator will be described with reference to FIG. In the figure, reference numeral 1 is a stator coil of an alternator (a separately excited generator of a power generator), the center portion of which is
A rotor coil 3 forming an electromagnet is arranged so as to be connected to the engine and rotate. 2 is a rectifier circuit,
Electric power generated by the rotation of the rotor coil 3 is rectified and output as a direct current, and a battery 6 (described later) connected in parallel to both ends of the rectifier circuit 2 is charged.

Reference numeral 4 denotes a power supply device generally called an IC regulator, which has B terminals, P terminals, F terminals, S terminals, and L terminals, and control transistors TR1, TR2,
It has a flywheel diode D1 and a voltage control IC 5, and the voltage output from the rectifier circuit 2 is input from the B terminal, and the voltage output from the stator coil 1 is input from the P terminal to output the L terminal output. Switch to low level state or high level state.

Reference numeral 7 is an ignition switch which constitutes a key switch of the vehicle, 8 is a charge lamp, one end of which is connected to the ignition switch 7 and the other end thereof is connected to the L terminal of the power supply device 4. The rotor coil 3 is connected between the positive side of the battery 6 and the F terminal of the power supply device 4, and when the F terminal is in a low level state, a current for turning the rotor into an electromagnet flows.

Next, the operation of the above configuration will be described with reference to FIG. When the ignition switch 7 is off,
Since no current is supplied to the L terminal, the internal power supply (power supply circuit) of the voltage control IC 5 is not turned on and the transistor T
R2 is off. After that, the ignition switch 7 is turned on (step 100), but the internal power supply (power supply circuit) of the voltage control IC 5 is maintained until the voltage rises to a predetermined voltage.
Is not turned on, and the transistor T2 is not turned on yet. Therefore, the charge lamp 8 is not turned on (step 101).

After that, when the voltage at the L terminal rises and exceeds, for example, 2.8 V (step 102), the transistor TR3 is turned on, the internal power supply is turned on, and the transistor TR2 is turned on (step 103). As a result, the L terminal voltage V _L of the voltage control IC 5 is lowered and the charge lamp 8 is turned on (step 104).

When the L terminal voltage V _L is lowered to around 0.3 V by turning on the transistor TR2 (step 105), the current flowing through the diode D2 and the resistor R2 connected in series therewith becomes small, so that the transistor TR3. Is turned off, but the transistor TR5 continues to be turned on (step 106). As a result, the voltage control IC
The ground terminal of the internal power source, which is the power source circuit of No. 5, is grounded and the function as the power source circuit is maintained (step 107).

Although the B terminal is a terminal for supplying electric power from the rectifier circuit 2 to the power supply device 4 in FIG. 4, the B'point in FIG. 4 may be considered as the B terminal.

[0009]

However, in such a vehicular power generator, a large current is required for the starter when the engine is started, and the battery voltage is from 12V to 9V.
Although it usually drops to around 10V, the electric power generated by the alternator is supplied to the starter while the ignition switch is ON, so the battery is started for that much. The power supplied to the starter is reduced. That is, there is a problem in that the alternator acts as a load on the starter, and acts to deteriorate the engine starting characteristics. This will be described below using mathematical expressions.

That is, assuming that the engine is driven in a steady state at a certain rotation speed N, the electric power generated by the alternator at this time is Pa (N),
If the power that the starter can generate is Ps (N), then (Ps (N) -Pa (N)) / ηa = Pe (N) ηa: The efficiency of the alternator is the energy that drives the engine (the energy that the engine absorbs). is there. Current consumption of starter is Ps
Considering (N) / ηs / VB, the current actually supplied from the battery 6 to the alternator is Ps (N) / ηs / VB-Pa (N) / VB = (Ps (N) / ηs-Pa (N) )) / VB η s: The efficiency of the starter, which means that the battery current supplied is less than that required without the alternator, making it difficult to start the engine.

In particular, when the engine is started by using the remote-controlled engine starter, the driver does not operate the accelerator pedal or the ignition switch while directly listening to the engine sound, but rather from a remote place for a predetermined time. ,
Since the starter is driven wirelessly, the accelerator pedal cannot be operated while listening to the engine sound, so the torque generated by the engine cannot be increased during cranking, especially during winter when the engine is hard to start. There was a problem that the starter was stopped just before the complete explosion and the engine would not start easily.

The present invention has been made in view of the above points, and it is an object of the present invention to improve the starting characteristics of an engine so that the engine can be easily started.

[0013]

SUMMARY OF THE INVENTION A vehicle generator according to the present invention detects an alternator that generates an amount of electricity according to the number of revolutions of an engine and a generated voltage of the alternator, and the generated voltage is a predetermined voltage. In a vehicular power generator including a voltage control circuit that switches the charge lamp from a lighting state to an extinguishing state when it is determined that the engine is driven when the voltage exceeds the voltage control circuit, the voltage control circuit is for a predetermined time when the engine is started. Only temporarily stop the start function.

[0014]

The vehicle power generator according to the present invention temporarily suspends the starting function of the voltage control circuit for controlling lighting and extinguishing of the charge lamp only during a predetermined time when the engine is started to start the engine. The starter load is reduced to improve the starting characteristics.

[0015]

【Example】

[First Embodiment] The structure of this embodiment will be described below with reference to FIG. In FIG. 1, the same components as those described with reference to FIG. 4 or equivalent components are designated by the same reference numerals, and the description thereof will be omitted. Only different components will be described below.

That is, in FIG. 1, a switch circuit 10 is composed of a switching contact piece 12 and a relay coil 11 for switching and driving the switching contact piece 12. One end of the relay coil 11 is grounded and the other end is It is connected to a positive terminal of the battery 6 and a non-grounded terminal of the starter 24 via a start switch (which is one of the switches forming a key switch of the vehicle) 13. Also, contact piece 1
When current is supplied to the relay coil 11, 2 is connected to the grounded terminal a, but is normally maintained in a neutral state.

In the above structure, when the ignition switch 7 is turned on to start the engine, the power supply device 4 starts operating to turn on the transistor TR5 as described in the above-mentioned conventional example, whereby voltage control is performed. Although the power supply circuit of the IC 5 exerts its function and maintains the voltage of the L terminal at a predetermined voltage, for example, about 0.3 V, the key switch is further rotated and the start switch 13 is turned on.
When N, current flows from the battery 6 to the relay coil 11, the contact piece 12 is switched to the ground side, and the L terminal of the power supply device 4 is grounded.

As a result, the voltage of the L terminal drops to 0 volt, the transistor TR5 is turned off, and the voltage control IC5
Is switched to the inactive state, only the charge lamp 8 is turned on, and the power supply device 4 does not become the load of the starter.

After that, when the engine is started and the key switch is rotated in the opposite direction and the start switch 13 is turned off, no current is supplied to the relay coil 11, so that the contact piece 12 is switched to the non-ground side b. The voltage of the L terminal rises, the transistor TR5 is turned on, and the voltage control I
C5 and the power supply device 4 start operating normally.

In the first embodiment, the switch circuit 1
Although the relay is used as 0, it goes without saying that the switching transistor 14 may be used as shown in FIG. 2, but in this case, the bias resistor 25 is required to drive the switching transistor 14. Become.

[Second Embodiment] In the following, this embodiment is constructed by additionally connecting a remote engine starter to the construction shown in FIG. 1 in which a part of the construction described in FIG. 1 is replaced. Is shown in FIG. 3 and its description will be given.

In FIG. 3, the same components as those described with reference to FIGS. 1 and 4 or equivalent components are designated by the same reference numerals, and the description thereof will be omitted. Only different components will be described below.

That is, 15 is a remote engine starting device,
Electric switches of the same function connected in parallel to switches such as an ignition switch 7 and a start switch 13 which are sequentially turned on while manually rotating the key switch are controlled to be turned on and off by an electric signal. The details will be described below. explain.

Reference numeral 16 denotes an antenna which receives a code signal such as an engine start signal and an engine stop signal wirelessly transmitted from a portable transmitter (not shown). A high-frequency circuit 17 detects and demodulates the code signal supplied from the antenna 16 and supplies the code signal to the control circuit 18. Control circuit 1
Reference numeral 8 outputs various control signals based on the code signal transmitted from the high frequency circuit 17.

That is, when the engine start signal is wirelessly supplied, the control circuit 18 first connects an accessory switch (which is one of the key switches) (not shown) to a relay (not connected) connected in parallel. Equivalently ON in the drawing), and then the ignition switch 7 is equivalently turned ON by the first power supply relay 19 connected in parallel therewith,
Further, turning on the second power relay 20 and making the start switch 13 equivalent to turning on start the cranking.

The control circuit 18 has a start detection circuit 21.
When the engine start completion signal F indicating that the engine has been started is supplied from, the second power supply relay 20 turned on at the start of the start is turned off. Further, the start detection circuit 21 detects that the voltage level at the connection point between the charge lamp 8 and the first power supply relay 19 is high level, determines that the engine has been started, and sends an engine start completion signal to the control circuit 18. Supply.

Reference numeral 22 in the drawing denotes a power supply circuit, which supplies electric power to each of the high frequency circuit 17, the control circuit 18, and the start detection circuit 21. Reference numeral 23 is a backflow prevention diode.

Next, the operation of the above structure will be described with reference to FIG. The engine start signal is supplied from the portable transmitter and is received by the antenna 16, and the high frequency circuit 17 is received.
The output signal from the high frequency circuit 17 is supplied to the control circuit 18 by being supplied to the control circuit 18. Control circuit 18
Turns on the first power supply relay 19, the accessory relay (not shown), and the second power supply relay 20 to turn on the charge lamp 8 and start the cranking of the engine by driving the starter. As a result, the switching transistor 14 is turned on.

At this time, since the voltage at the connection point between the charge lamp 8 and the first power supply relay 19 input to the start detection circuit 21 is at the low level, the start detection circuit 21 sends the engine start completion signal to the control circuit 18. However, when the engine is started and the voltage at the connection point between the charge lamp 8 and the first power supply relay 19 becomes high, an engine start completion signal is supplied from the start detection circuit 21 to the control circuit 18 for control. The circuit 18 turns off the second power relay 20.
The engine start operation is completed by switching to the state.

In the above embodiment, the backflow prevention diode 23 is used to reduce the load on the starter only at the time of starting by remote control. However, the backflow prevention diode 23 may be omitted. In this case, by manually turning on the start switch 13, during that time, a bias current flows through the bias resistor 25, the switching transistor 14 is turned on, and the L terminal of the alternator (generator) is grounded. It goes without saying that the same effect as described can be obtained.

[0031]

As described above, according to the present invention, the effect that the electric load at the time of starting is reduced and the starting characteristics can be improved is exhibited.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a circuit block showing a first embodiment according to the present invention.

2 is another embodiment of the switch circuit 10 of FIG.

FIG. 3 is a circuit block diagram showing a second embodiment according to the present invention.

FIG. 4 is a circuit block diagram of a conventional device.

FIG. 5 is a flowchart illustrating the operation of a conventional device.

[Explanation of symbols]

 10 Switch Circuit 11 Relay Coil 13 Start Switch 14 Switching Transistor 15 Remote Engine Starter 17 High Frequency Circuit 18 Control Circuit 19, 20 Relay 21 Start Detection Circuit

Claims (1)

[Claims] 1. An alternator for generating an amount of electricity according to the number of revolutions of an engine, a generated voltage of the alternator is detected, and when the generated voltage exceeds a predetermined voltage, it is determined that the engine is driven and a charge lamp. In the vehicular power generation device including a voltage control circuit for switching from a lighting state to a non-lighting state, the voltage control circuit temporarily stops the starting function only for a predetermined time when the engine is started. Vehicle power generator.