KR101233958B1

KR101233958B1 - Engine starting device

Info

Publication number: KR101233958B1
Application number: KR1020100098115A
Authority: KR
Inventors: 하루키 나카야마; 나오히토 카네다
Original assignee: 미쓰비시덴키 가부시키가이샤
Priority date: 2010-05-20
Filing date: 2010-10-08
Publication date: 2013-02-15
Also published as: KR20110128117A; FR2960265A1; JP2011241779A; JP5059907B2; CN102251900A; CN102251900B; FR2960265B1

Abstract

[assignment]
With a simple circuit structure, an instantaneous interruption is prevented and an engine starting device is obtained which does not impair the function of the starting device even when the short switch is inoperable.
[Solution]
The starter switch 5 connected in series between the power supply 3 and the starter motor 2, the resistor 6 connected in series with the starter switch, the short circuit switch 7 for shorting the resistor, and the opening and closing of the short switch It is provided with the timer circuit 8 to control, it energizes a starter motor through a starter switch and a resistor from a power supply by closing the starter switch 5, and closes the short circuit switch 7 after a delay time after the starter switch is closed, An engine starting device for shorting a resistor, wherein the contacts of the short switch 7 are always closed contacts, the contacts of the short switch 7 are opened before the contacts of the starter switch 5 are closed, and the contacts of the starter switch are closed. After that, the contacts of the short-circuit switch are closed.

Description

Engine starter {ENGINE STARTING DEVICE}

The present invention relates to an engine starting device for starting an engine with a starter motor.

When starting the engine, the coil of the starter switch is energized and the fixed contact of the starter switch is closed to supply electric power to the starter motor from the vehicle power supply to generate a rotational torque to the starter motor. Through the pinion gear and the ring gear, the starting force of the starter motor is transmitted to the engine crankshaft to start the engine. At this time, when the starter switch is closed, the starter motor is still stopped and no counter voltage is generated. Thus, inrush current of several hundred to several thousand amperes flows due to the extremely small starter internal resistance. At that time, the vehicle power supply generates a voltage drop in which the terminal voltage is lowered due to internal intrinsic resistance.

For this reason, when the engine is started, the voltage drop of the vehicle power supply caused by the current when the starter motor is started causes a momentary interruption when using other electric devices of the vehicle, for example, a stereo, a navigation system, an air conditioner, or the like. there is a problem. This momentary interruption is not particularly a problem in normal engine start-up, but in a vehicle equipped with an idling stop function, a momentary interruption occurs when restarting after an idling stop, which may cause discomfort to the driver and passengers. .

On the other hand, the starter which is equipped with the means which suppresses the inrush current which flows at the time of starting of a starter motor, and prevents generation | occurrence | production of an instantaneous interruption is known (refer patent document 1).

The starter shown in this patent document 1 has a resistor connected to the motor circuit in series with the main contact, and an auxiliary contact connected to the motor circuit in parallel with the resistor, and has a second electronic switch for opening and closing the auxiliary contact. The maximum current value that flows through the motor at the time of energization of the second electronic switch is referred to as the resistor energization time when the time from the energization of the first electronic switch to energization of the second electronic switch is called a resistor energization time. The resistance energization time is set so that it will be below the maximum current value which flows through a motor at the time of energization of a switch.

That is, in Patent Document 1, the resistor energization time is appropriately set, and the maximum current value flowing through the motor at the time of energization of the second electronic switch is controlled to be equal to or less than the maximum current value flowing through the motor at the time of energization of the first electronic switch. As a result, a starter is disclosed in which voltage drop of the battery terminal voltage can be stably suppressed to prevent the occurrence of an instantaneous interruption.

[Prior Art Literature]

[Patent Document]

Patent Document 1: Japanese Patent Application Laid-Open No. 2009-287459

In the above known technique (Patent Document 1), in order to control the resistance energization time, the second electronic switch has a timer circuit, and the signal from the IG switch after energizing the suppressed current by closing the first electronic switch. The timer circuit having received the current is energized to the exciting coil of the second electronic switch after the predetermined time has elapsed, thereby shorting the resistor provided in the circuit and applying the full voltage of the battery to the motor.

However, if the timer circuit does not operate normally due to, for example, an increase in ambient air temperature, static electricity, or surge, the energization of the exciting coil of the second electronic switch is not performed. Therefore, it is considered that the current suppression resistor cannot be shorted.

In this case, since energization is continued through the starter motor through the current suppression resistor, there is a possibility that the current value flowing through the motor is small and the engine may take a long time to start or the engine may not be started.

On the other hand, when the 2nd electronic switch of the said well-known technique (patent document 1) is made into a normally closed contact (N / C contact), and a timer circuit is operating normally, driving of a 2nd electronic switch is performed. It is conceivable to short-circuit the resistor and apply the full voltage of the battery to the motor by energizing the coil, energizing the current suppressed by energizing the resistor, and controlling the resistor energization time by the timer circuit. In this case, when the timer circuit does not operate normally due to any abnormality, as the energization is not performed to the drive coil of the second electronic switch, the current suppression resistor is always short-circuited and the voltage drop of the battery terminal voltage falls. The effect of stably suppressing and preventing the occurrence of momentary interruption is not obtained, but the function as a conventional engine starting device can be maintained.

However, in such a circuit configuration, it is necessary to first open the second electronic switch from the short-circuit state before the first electronic switch is closed, and on the other hand, the opening / closing timing of the second electronic switch is freed by the timer circuit. You can decide.

Therefore, when the time when the first electronic switch is closed is a combination earlier than the time when the second electronic switch is opened, the timing of energizing the first electronic switch is also controlled, so as to be delayed and short-circuited than the second electronic switch. This necessitates a complicated circuit configuration. On the other hand, if mechanically delaying the time from closing after energizing to the first electronic switch, the result is contrary to the quick start required for the idling stop or the like.

The present invention has been made to solve the problems in the conventional engine starter as described above. The simple and inexpensive configuration prevents the opening and closing control of the short-circuit switch that short-circuits the current suppression resistance due to any factor. Even if it is, the objective of this invention is to provide the engine starter which made it possible to prevent generation | occurrence | production of the "instantaneous interruption" resulting from the fall of the battery terminal voltage, without impairing the function as an engine starter.

An engine starting apparatus according to the present invention includes a starter switch connected in series between a power supply and a starter motor, a resistor connected in series to the starter switch, a short circuit switch for shorting the resistor, and a timer for controlling opening and closing of the short circuit switch. And a current suppressed from the power supply through the starter switch and the resistor by closing the starter switch to the starter motor, and closing the short circuit switch after a delay time after the starter switch is closed. An engine starting device for shorting a resistor, wherein the contact point of the short-circuit switch is a normally closed contact point, and before the contact point of the starter switch closes, the contact point of the short-circuit switch opens and closes the starter switch. After the contact is closed, the contact of the short-circuit switch is closed. ) It is configured such that.

According to the engine starting device of the present invention, even when the timer circuit does not operate normally for any reason, the short-circuit switch that short-circuits the resistor is always closed, so that no motor current flows through the resistor. Also in this case, the function as an engine starting device is not impaired.

On the other hand, when the timer circuit is normal, after supplying the current suppressed by the resistor to the motor, the entire voltage of the battery can be applied to the motor at a predetermined timing, and the voltage drop of the battery terminal voltage can be stably suppressed. It is possible to prevent the occurrence of "instantaneous interruption" caused by the drop of the battery terminal voltage. In addition, since it is not necessary to control the energization of the starter switch to the drive coil, there is an effect that an engine starting device can be obtained with a simple and inexpensive circuit configuration.

Other objects, features, and effects of the present invention described above and others will become more apparent from the following detailed description of the embodiments and the description of the drawings.

1 is an electrical circuit diagram of an engine starting apparatus according to Embodiment 1 of the present invention.
2 is a time chart according to the operation of the engine starting apparatus according to Embodiment 1 of the present invention.
3 is a graph showing the current-voltage waveform of the engine starting apparatus according to Embodiment 1 of the present invention.

Embodiment Mode 1.

1 is an electric circuit diagram of an engine starting apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a timing chart of an operation of the engine starting apparatus according to Embodiment 1 of the present invention, and the horizontal axis represents time.

In FIG. 1, the engine starting device 1 includes a starter motor 2 for starting an engine (not shown), a battery 3 as a power source for supplying power to the starter motor 2, and a starter motor 2. Fixed to be connected to the starter motor 2 via the start switch 4 connected to the battery 3 for starting the starter switch, the starter switch 5, and the contact terminals 5g and 5h of the starter switch 5. A short-circuit switch provided so that the contacts 5e and 5f, the current suppression resistor 6 connected in series to the fixed contacts 5e and 5f, and the current suppression resistor 6 are short-circuited when an engine start request occurs. 7) and a timer circuit 8 incorporated in the short circuit switch 7 for energizing the drive coil 7b of the short circuit switch 7.

The starter switch 5 includes the fixed contacts 5e and 5f connected in series between the starter motor 2 and the battery 3, the drive coil 5b for driving the movable contact 5i, and the movable contact. The holding coil 5C which hold | maintains 5i in the position which contacted the fixed contacts 5e and 5f, and the plunger 5d fixed to the movable contact 5i are provided. The holding coil 5C is connected between the start switch 4 and the ground terminal GND.

The short circuit switch 7 includes the fixed contacts 7e and 7f connected between the starter switch 5 and the starter motor 2, the drive coil 7b for driving the movable contact 7i, and the movable contact ( A current suppression resistor 6 connected in parallel with the short circuit switch 7 by connecting both terminals between the plunger 7d fixed to 7i, the contact terminals 7g and 7h of the short circuit switch 7, and the contact terminal. The timer circuit 8 which controls opening / closing is provided. The drive coil 7b is connected between the timer circuit 8 built in the short circuit switch 7 and the ground terminal GND, and the movable contact 7i is located at a position in contact with the fixed contacts 7e and 7f. Maintained normally closed contact point.

Next, the operation of the engine starting apparatus according to the first embodiment of the present invention configured as described above will be described.

1 and 2, first, as a first step of starting the engine, when the start switch 4 is closed by the engine start request at the time point T1, the start switch 4 and the starter switch from the battery 3 are closed. Through the drive coil 5b of (5), a current starts to be supplied to the starter motor 2. On the other hand, at the same time as the energization, a start request is also input to the timer circuit 8 in the short-circuit switch 7, and the current starts to be supplied to the drive coil 7b.

Here, by energizing the drive coil 5b in response to the start request, the movable contact 5i of the starter switch 5 starts to move toward the fixed contacts 5e and 5f via the plunger 5d, and the starter switch I want to close (5).

On the other hand, by energizing the drive coil 7b by the start request, the movable contact 7i of the short-circuit switch 7 starts to move away from the fixed contacts 7e and 7f side through the plunger 7d. Attempt to open the short-circuit switch 7.

The time required for the switches 5 and 7 to open and close after the energization is started to the drive coils 5b and 7b of the switches 5 and 7 depends on the magnetic characteristics, coil specifications, and It is determined by the specification of each spring (not shown) required for opening and closing of the fixed contact, and in the present invention, the opening and closing time of the starter switch 5 is configured to be delayed than the opening and closing time of the shorting switch 7.

That is, as shown in FIG. 2, at the time T2 when the fixed contacts 7e and 7f of the short switch 7 are opened, the fixed contacts 5e and 5f of the starter switch 5 are not closed yet. The starter switch 5a is not closed.

Subsequently, as the second step, the fixed contacts 5e and 5f are closed at the time point T3, so that the starter switch 5 is closed. At this time, the battery 3 is energized from the battery 3 via the start switch 4 to hold the plunger 5d at that position. As a result, the closing of the starter switch 5 is maintained.

As the starter switch 5 is closed, current flows from the battery 3 to the starter motor 2 through the current suppression resistor 6. As a result, the starter motor 2 generates a rotational torque and moves the pinion gear (not shown) coupled to the rotor shaft of the starter motor 2 via the one-way clutch toward the ring gear side provided on the crankshaft of the engine. Engage a ring gear (not shown).

At this time, a voltage lower than the full voltage of the battery 3 is applied to the starter motor 2, and the current suppressed by the current suppression resistor 6 is applied to the starter motor 2. By the flow, the starter motor 2 rotates at a low speed.

When the starter switch 5 is closed, the current flowing from the battery 3 to the drive coil 5b almost disappears, and the starter switch 5 and the current suppression resistor 6 closed from the battery 3 are removed. It becomes a flowing current.

Subsequently, as a third step, the timer circuit 8 operates at a time point T4 after the predetermined delay time has elapsed from the time point T1 at which the start request was made, so that the fixed contacts 7e and 7f of the short circuit switch 7 are closed. The plunger 7d starts to move. As a result, the short circuit switch 7 connected in parallel with the current suppression resistor 6 is closed in time T5 which the time required for the closing of the short circuit switch 7 passes from time T4. The current suppression resistor 6 is short-circuited by closing the short-circuit switch 7.

By closing the short switch 7, the normal starter current is supplied from the battery 3 to the starter motor 2 via the starter switch 5 and the short switch 7. At this time, since the short switch 7 is closed and the current suppression resistor 6 is shorted, as shown in FIG. 3, the starter current increases again. The starter motor 2 is driven by the supplied normal starter current, transmits the rotational force to the crankshaft of the engine via the engaged pinion gear and the ring gear to start the engine, and ends the start request at time T6. Then, the start of the engine is completed at the time point T7 after the elapse of the time when the plunger 7d moves.

In the first step between the time points T1 to T2 described above, on the circuit, the internal specific resistance RB of the battery 3, the resistance RP of the drive coil 5b, the internal resistance RS of the starter motor 2, And each wiring resistance RW. Between the time points T2 to T3, since the short-circuit switch 7 is opened, the internal resistive resistance RB of the battery 3, the resistance RP of the drive coil 5b, and the current suppression resistor 6 are on the circuit. The resistance value RSR, the internal resistance RS of the starter motor 2, and each wiring resistance RW exist.

Since the starter switch 5 is closed between the time points T3 and T5, the internal specific resistance RB of the battery 3, the resistance value RSR of the current suppression resistor 6, and the starter motor 2 of the starter motor 2 are closed on the circuit. Since the internal resistance RS and each wiring resistance RW exist, and the short-circuit switch 7 is closed between the time points T5 to T7, the internal specific resistance RB of the battery 3 and the starter are on the circuit. The internal resistance RS of the motor 2 and each wiring resistance RW exist.

After the start switch 4 is closed and the short switch 7 is once opened, the delay time from closing again to shorting both ends of the current suppression resistor 6 is performed at the time T3. Closed, current flows to the starter motor 2 through the current suppression resistor 6, and is determined by the time from the start of the starter motor 2 to the predetermined rotational speed and the predetermined time. The number of rotations of is determined by how far the voltage drop is allowed. That is, the delay time can be made small if the amount of voltage reduction of the target battery may be set large, and the delay time needs to be made large if the amount of voltage drop is set small. The allowable decrease in battery voltage needs to be within a range not to momentarily interrupt the on-vehicle electrical equipment. The delay time and the resistance of the resistor are set by the internal resistance of the battery, the starter motor specification (internal resistance), the wiring resistance, and the target engine.

As described above, according to the engine starting apparatus according to Embodiment 1 of the present invention, at the time T3 at the time of start of the starter motor, the current suppression provided between the battery 3 and the starter motor 2, which are power sources, is first applied. By energizing the resistor 6, starting the starter motor 2 with a low current, and shorting the current suppression resistor 6 to the short-circuit switch 7 after a predetermined delay time has elapsed. The voltage drop of the power supply at the start of start can be suppressed, and the occurrence of "momentary interruption" caused by the drop of the battery terminal voltage can be prevented. In addition, even if the short switch 7 cannot be opened or closed due to any cause, the short switch 7 is always closed, so that the function as a normal starter is not impaired.

In addition, in this Embodiment 1, although the short circuit switch 7 is connected between the starter switch 5 and the starter motor 2, the short circuit switch 7 is connected between the battery 3 and the starter switch 5. The same effect can be obtained even when connected to.

Furthermore, in Embodiment 1, although the timer circuit 8 which controls opening / closing of the short circuit switch 7 is built in the short circuit switch 7, the starter switch 5 and the short circuit switch 7 by ECU etc. are carried out. The same effect can also be obtained by collective control or control of the short circuit switch 7 alone.

1: engine starting device
2: starter motor
3: battery
4: start switch
5: starter switch
5b: drive coil
5c: retaining coil
5d: plunger
6: current suppression resistance
7: short circuit switch
7b: drive coil
8: timer circuit

Claims

And a starter switch connected in series between a power supply and a starter motor, a resistor connected in series to the starter switch, a short circuit switch for shorting the resistor, and a timer circuit for controlling opening and closing of the short circuit switch. An engine starting device which energizes the starter motor with the current suppressed through the starter switch and the resistor from the power supply by closing, and closes the short circuit switch after a delay time has elapsed since the starter switch is closed. ,
The contact point of the short-circuit switch is a normally closed contact point, and the time from the start of the energization to the short-circuit switch until the contact is opened is until the contact is closed after the start of the energization to the starter switch. When the current starts to flow in the starter motor through the starter switch due to an engine start request, the current is supplied to the short-circuit switch by the timer circuit in which the engine start request is input. And the contact of the short switch is closed before the contact of the switch is closed, and the contact of the short switch is closed after the contact of the starter switch is closed.

delete

The method of claim 1,
And a timer circuit for controlling the delay time is built in the short-circuit switch.