KR20030015038A - a control device of stater motor for vehicles - Google Patents

Abstract

PURPOSE: A start motor controlling apparatus is provided to protect a start motor and an engine from a shock by preventing the start motor from being operated when the engine is operated. CONSTITUTION: A start motor controlling apparatus includes an ignition switch(2) connected to a battery for transferring electric power of the battery to a start motor(1) when a user shifts an ignition key into a start position. The start motor(1) is connected to the ignition switch(2). A relay(3) is positioned between the start motor(1) and the ignition switch(2). A transistor(4) is provided to transfer a driving power in order to shut off a switch(3a) of the relay(3). A transistor driving circuit(5) is provided to drive the transistor(4). A tachometer(6) applies a voltage signal to the transistor driving circuit(5).

Description

Starter motor control device for a vehicle {a control device of stater motor for vehicles}

The present invention relates to a control apparatus for a starting motor of an automobile, in particular, to minimize the impact that the starting motor can continue to operate even after the engine is started at start-up, and the vehicle can be surely started by a single key operation. It relates to a starting motor control device.

In general, since the engine of a vehicle cannot be started by magnetic force in a stopped state, cranking at start is performed by using external power.

The starter motor is mainly used as the external power source, and the starter motor operates by being supplied with battery power, and starts the engine by rotating its pinion gear by engaging the ring gear installed on the flywheel of the engine.

On the other hand, as shown in Figure 1, the starting motor 1 is directly connected to the start position (ST position) terminal of the ignition switch (2) connected to the battery, the driver inserts the key inserted into the key cylinder in the start position By performing the operation of switching to and holding the battery, the current of the battery is transmitted to the starting motor 1 to operate.

However, in the state where the starter motor 1 is simply directly connected to the ignition switch 2 as described above, since the operation of the starter motor 1 is purely controlled only by the driver's key operation, proper operation control cannot be achieved. That is, even though the engine is started, the starter motor 1 continues to operate so that a shock is transmitted from the engine to shorten the service life.

In addition, even after the initial start of the engine, even if the engine is operating normally, simply put the key in the starting position, so that the starting motor 1 is operated, which also causes the starting motor and the engine.

In addition, even if the driver does not check whether the start is normally started and the start is not yet started, the key operation is stopped and the restart operation is frequently occurred.

Therefore, the present invention has been invented to solve the above problems, and the driver only needs to leave the key in the starting position for a sufficient time without worrying about excessive starting operation, and the engine is automatically started as soon as the engine is normally started. This can reduce the shock transmitted to the starting motor at start-up by cutting off the supply of oil.In addition, when the key is turned to the starting position, the starting motor is not operated even if the key is turned to the starting position, thereby preventing the impact on the starting motor and the engine. The purpose of the present invention is to provide a starting motor control apparatus for a vehicle that can prevent the phenomenon of repeating a key operation for starting.

1 is a power supply circuit diagram of a conventional starting motor,

2 is a circuit diagram of a starter motor control apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: starting motor, 2: ignition switch,

3: relay, 3a: switch,

3b: coil, 4: transistor,

5: transistor driving circuit, R1, R2: resistance,

C: condenser, 6: tachometer.

The present invention for achieving the above object, the ignition switch connected to the battery, the starter motor connected to the ignition switch, a relay provided between the starter motor and the ignition switch, a transistor for applying the relay driving power And a transistor driver circuit for driving this transistor, and a tachometer for applying a voltage signal to the transistor driver circuit.

That is, by driving the relay using the voltage rise phenomenon of the tachometer that generates the normal voltage at the same time as the engine is driven normally, it is possible to cut off the power of the battery supplied to the starting motor.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

FIG. 2 is a circuit diagram of an apparatus for controlling a starter motor of a vehicle according to the present invention. The present invention is connected to a battery to transfer power of a battery to a starter motor 1 when a driver switches a starter key to a start position. An ignition switch 2, the starting motor 1 connected to the ignition switch 2, a relay 3 connected between the starting motor 1 and the ignition switch 2, and this relay 3 A transistor 4 for transmitting driving power for blocking the switch 3a of the < RTI ID = 0.0 >), a transistor driving circuit 5 for driving the transistor 4, and a tachometer for applying a voltage signal to the transistor driving circuit 5. It consists of (6).

The switch 3a of the relay 3 is normally connected to the ignition switch 2 and the starting motor 1, and the coil 3b is magnetized by the power supplied through the transistor 4.

On the other hand, the tachometer 6 generates a signal to which a voltage of about 8V is applied for about 1 second at an initial start-up (there are slight differences depending on engine characteristics and temperature conditions), and about 12V after the engine starts to operate normally. Generates a voltage signal.

This voltage signal is filtered and linearized as it passes through the transistor driving circuit, which is an RC circuit, which is transmitted to the transistor 4, which is transmitted from the transistor driving circuit 5. Power is supplied to the coil 3b of the relay 3 from the time when the voltage signal of the tachometer 6 has a voltage of 12V.

The transistor driving circuit 5 is composed of a resistor R1 connected in series with the tachometer 6 and a resistor R2 connected in series thereto, and a capacitor C connected in series with one end of the resistor R1 and grounded at one end, and resistors R1 and R2. As a result, a voltage at which the switching action of the transistor 4 is turned on is formed, and the capacitor C serves to smooth the pulsed signal input from the tachometer 6.

Therefore, when the ignition switch 2 is switched to the start mode by the driver, the engine is started by supplying the battery power to the start motor 1 through the switch 3a of the relay 3 in the connected state, and then the normal state. Enter the driving stage.

At this time, as described above, the voltage signal of 8V is generated in the tachometer 6 at the beginning of the engine, and the output current of the transistor driving circuit 5 which has received the 8V input is cut off from the transistor 4 so that the relay ( Since it is not transmitted to the coil 3b of 3), the coil 3b does not become magnetized and the switch 3a remains in the connected state.

Subsequently, when the engine is normally operated, a 12V voltage is generated in the tachometer 6, and the output current of the transistor driving circuit 5 which receives this 12V input causes a switching action of the transistor 4, whereby the coil 3b When the current is supplied and magnetized, the switch 3a is switched from the on state to the off state to stop the battery power supply to the starting motor 1.

Therefore, even if the driver keeps the key in the starting position, the starting motor 1 is operated only until the engine is normally operated, so that the driver is not excessively operated and is not impacted by the engine rotation.

In addition, since the voltage of 12 V is continuously generated in the tachometer 6 in the state in which the engine is operating normally, the driver accidentally presses the key by switching the switch 3a of the relay 3 by the same action as described above. Even when it is turned to the starting position, the starting motor 1 does not operate, and thus, the starting motor 1 is operated during engine operation, thereby preventing the occurrence of shock on the starting motor 1 or both sides of the engine.

In addition, it is possible to safely start the engine at the start of the key operation without worrying about whether the key operation is performed for a long time, so that the engine can be securely started at the time of the key operation. The inconvenience of having to restart the engine after starting the engine is eliminated.

As described above, according to the present invention, even if the driver keeps the key in the starting position for too long, the starting motor is operated only until the proper time for the engine to operate normally and is no longer operated, and the engine is started when the engine is operating normally. Even if the key is placed in the starting position, the starting motor does not operate, so the starting motor does not operate under unreasonable conditions, thus extending the life of the starting motor and eliminating the need for the driver to worry about excessive starting time. Since the key can be held in the starting position for a while, the starting is successful in one operation of the key, thereby improving the startability.

Claims (2)

An ignition switch 2 connected to a battery, a starter motor 1 connected to the ignition switch 2, a switch 3a connecting the starter motor 1 and the ignition switch 2 and a magnetization switch 3a A relay (3) having a coil (3b) for pulling the switch to an off state, a tachometer (6) having a voltage rise phenomenon of an output signal during engine startup, and a pulse type of the tachometer (6) connected to the tachometer (6) A transistor driving circuit 5 for converting a signal into a linear signal, which is connected to the transistor driving circuit 5 so that the transistor driving circuit 5 inputs an elevated voltage signal generated after the engine normal operation in the tachometer 6 as an input; And a transistor (4) for transmitting the output current to the coil (3b) of the relay (3). 2. The transistor driving circuit (5) according to claim 1, wherein the transistor driving circuit (5) receives resistors R1 and R2 for receiving an elevated voltage signal generated by the tachometer 6 after engine normal operation and converting the transistor 4 into an operating voltage, and a pulse; A starter motor control device for a vehicle, comprising a capacitor C for linearly converting an input signal.