JPH07150996A - Engine stopping device - Google Patents

Abstract

PURPOSE:To prevent the opening condition of the relay contact of a stop motor by stopping rotation of a stop motor on the way when a key switch is immediately returned to ON after being set OFF. CONSTITUTION:A stop switch SS which is in the conducting condition during being pushed is provided on a driver's seat. When this stop switch SS is operated, a first relay R1 and a second relay R2 are operated in order so as to open a stop relay SR, and while a driver intends to operate a key switch KS and moves his hand from the position of the stop switch SS, the relay contact of a stop motor M is shifted on the start side. Hereby, when an engine is operated to stop, fuel injection is perfectly stopped without fail, in addition a fuel injection pump stop lever SL is perfectly returned, and hence impossibility of restarting can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used to shut down a diesel engine. The present invention is a device developed for large vehicles, but can be widely used as a stop device for diesel engines.

[0002]

2. Description of the Related Art Unlike a gasoline engine having a spark plug, a diesel engine does not stop immediately even if the power supply to the electric system of the engine is cut off by a key switch. Therefore, conventionally, there is widely known a device that shuts off the fuel supplied to the engine or lowers the air pressure in the cylinder in conjunction with the operation of the key switch so that the engine is stopped by operating the key switch. .

FIG. 4 shows a conventional engine stopping device for this purpose. In this example, when the key switch provided in the driver's seat is turned off, the stop relay SR is automatically opened, which causes the stop motor M to start and rotate in the stop direction to move the injection pump stop lever L. hand,
It shuts off the fuel supply to the engine. The device having this structure is described in detail in JP-A-3-57829.

[0004]

SUMMARY OF THE INVENTION In such a device,
If the key switch is temporarily turned off during operation and then turned on again immediately, the rotation of the stop motor M will be at an intermediate position, and it will not rotate on either side. This is because, for example, when the vehicle was stopped on the road waiting for a signal, the key switch was turned off once in order to make fuel consumption economical, but immediately the front car started moving, so turn the key switch on quickly. It can happen when you return to. That is, turn off the key switch
By doing so, the stop motor M rotates halfway,
Then the key switch is turned on and the stop motor M is turned on again.
When it is attempted to rotate in the opposite direction, the contact mr from the relay interlocking with the stop motor M will coincide with the timing at which the contact mr will switch, and the contact mr will not be in contact with any of the intermediate positions. turn into. In such a state, no matter how the key switch is operated, the engine will not start again. Such a situation is extremely rare but can occur.

Even if an attempt is made to improve this mechanically by providing a spring at the contact mr, it will be a major design change and will not be easily realized because a long-term test is required.

The present invention is to solve this as an electric circuit, in which the rotation of the stop motor stops halfway,
An object of the present invention is to provide an engine stop device in which a relay contact of a stop motor does not keep an open state.

[0007]

According to the present invention, there is provided a stop relay (SR) inserted in a circuit in which current disappears when a key switch (KS) is turned off, and a break contact of the stop relay. In an engine stop device including a stop motor (M) to which a driving current in a stop direction is supplied, a stop switch (SS) that is in a conductive state while being pressed is provided in a driver's seat, The operation-holding type first relay (R1) to which the starting current is supplied, the second relay (R2) to which the current is supplied through the make contact of the first relay, and the key switch are operated to the start position. Current is supplied when the reset relay (RR) for releasing the holding operation of the first relay is released.
And a break contact of the second relay is inserted in a current path of the stop relay (SR).

A lock relay (LR) is provided which mechanically prohibits the key switch (KS) from being turned off when the key switch (KS) is in the conductive position, and the lock relay is interlocked with the stop relay (SR). Connection is desirable.

[0009]

In the device of the present invention, the engine is stopped by operating the stop switch (SS). When the stop switch (SS) is operated, the first relay (R1) and the second relay (R2) are sequentially operated to open the stop relay (SR). Even if the driver operates the key switch (KS) immediately after operating the stop switch (SS) in order to restart the engine after operating the stop switch (SS), There is a time required to move from the position (SS) to the position of the key switch (KS), and the relay contact of the stop motor is sufficiently transitioned within this time.

Further, when the key switch (KS) is provided with a lock relay (LR), the key switch (KS)
Since the engine stop operation by is disabled, the engine stop operation is always performed by the stop switch (SS), so that the operation becomes more reliable. Key switch (KS) if lock relay (LR) is not provided
Since the engine can be stopped also by the operation of, the operation must be thoroughly performed so that the driver always operates the engine with the stop switch (SS). This is possible when a specific bus operating company or other driving discipline is observed, and in that case, the key switch (KS) does not need to be improved, and an inexpensive device can be provided. .

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a diagram showing a configuration of a main part of an embodiment of the present invention.

In the embodiment of the present invention, the stop relay SR inserted in the circuit in which the current disappears when the key switch KS is in the cut-off state, and the drive current in the stopping direction are supplied via the break contact of the stop relay SR. A stop switch SS which is provided with a stop motor M to be supplied and which is in a conductive state while being pressed is provided in a driver's seat, and an operation holding type first relay R1 to which a starting current is supplied via the stop switch SS. , A second relay R2 to which current is supplied via the make contact of the first relay R1, and a reset relay for releasing the holding operation of the first relay R1 which is supplied with current when the key switch KS is operated to the start position. (R
R) and the break contact of the second relay R2 is inserted in the current path of the stop relay SR. Further, a lock relay LR is provided which mechanically prohibits the key switch KS from being switched to the cutoff state when the key switch KS is in the conductive position, and the lock relay LR is connected so as to interlock with the stop relay SR.

Next, the operation of the embodiment of the present invention thus constructed will be described.

[Engine Stop Operation] FIG. 2 is a diagram for explaining the engine stop operation in the embodiment of the present invention.

When the engine is operating, the battery switch (front) BSF and the battery switch (rear) BSR are in the ON state, and the battery relay B
Since the current is supplied to the exciting coil, R is in the ON state.

When the stop switch SS is operated and turned on while the engine is operating in this way, a current is supplied to the exciting coil R of the first relay R1 and the contacts are turned on, and the second relay R2 is turned on. Excitation coil R
Is supplied with current. The second relay R2 receives the supply of this current to turn off the contact, and stops the supply of current to the exciting coil R of the stop relay SR. The contact mr1 is switched to the engine stop side by the stop of the current supply.

The stop switch SS automatically returns to an OFF state by releasing the finger, but the current from the battery E passes through the battery switch (front) BSF, the first relay R1, and the holding diode D. Then, since it is supplied to the exciting coil R of the first relay R1, the contact of the first relay R1 is held in the ON state. This allows
The contact of the second relay R2 remains in the OFF state, and the contact mr1 of the stop relay SR is switched to the engine stop side.

On the other hand, since the contact mr2 for switching the current supply to the stop motor M is switched to the engine stop side during the engine operation, the current from the battery E is the stop motor M as shown by the solid line arrow in FIG. Is supplied to the arm A, and the stop motor M stops the fuel injection.
The RM is rotated and the injection pump stop lever SL provided in the injection pump is moved via the spring SP and the cable CB to stop the fuel supply to the engine.

Therefore, even if an attempt is made to start the engine by operating the key switch KS immediately after the engine is stopped,
The contact mr2 interlocking with the stop motor M does not come into contact with any of the intermediate positions, and it is possible to prevent the engine from restarting even if the key switch KS is operated.

Next, the operation of the lock relay LR will be described. Under normal engine operating conditions, the power relay PR is
Is ON and the contact is ON because there is no current in the second relay R2, so the lock relay LR is in the energized state, and the rotation of the key switch KS is locked at the ON position and prohibited. Therefore, even if the engine is stopped by the key switch KS, the key switch itself does not rotate. The engine will always be stopped with the stop switch SS. The operation when the stop switch SS is pressed is as described above. At this time, the second relay R2 is energized and its contact is turned off, so that the lock relay LR is released and the key switch becomes rotatable.

By providing this lock relay LR, the engine stop operation is always performed by the stop switch SS. However, if the driver can be sure that the engine stop operation is always performed by the stop switch SS, It is not always necessary to provide this lock relay LR. In the case where a driving manual can be thoroughly enforced like a bus company, the lock relay LR can be omitted and the cost can be reduced.

[Engine Starting Operation from Temporary Stopped State]
FIG. 3 is a diagram for explaining the engine starting operation from the temporarily stopped state in the embodiment of the present invention.

When the key switch KS is turned to the "start" position, the current from the battery E is supplied to the reset relay RR for releasing the holding operation, and the exciting coil R is excited to turn off the contact. At this time, the current supply to the exciting coil R of the first relay R1 is stopped, its holding state is released, and its contact is turned off.

When the contact of the first relay R1 is opened, no current is supplied to the exciting coil R of the second relay R2, and the contact is turned on. As a result, the stop relay S
The R contact mr1 is switched to the starting side. On the other hand, since the contact mr2 of the stop motor M is switched to the start side with the stop of the engine, the current from the battery E is supplied to the stop motor M as indicated by the solid arrow. The stop motor M rotates by this current supply, and the arm ARM
Is rotated to the engine start side, the injection pump stop lever SL is moved to the fuel injection position, and the engine startable state is set. When the injection pump stop lever SL moves to the fuel injection position, the contact mr2 of the stop motor M switches to the engine stop side as shown by the broken line in conjunction with this injection pump lever SL, and the rotation operation of the stop motor M stops.

[Engine Starting Operation from Parking State] In this case, since the battery switch (front) BSF and the battery switch (rear) BSR are in the OFF state, these switches are turned on and the battery relay BR is turned on. Turn on. Next, when the key switch KS is turned to the start position, a current is supplied to the exciting coil R of the power relay PR and the contact is turned on.

On the other hand, since the stop switch SS is not operated, the first relay R1 is in the OFF state, so that no current is supplied to the exciting coil of the second relay R2 and the contact is in the ON state, and the stop relay SR Contact point m
r1 is switched to the starting side.

The current from the battery E is supplied to the stop motor M as shown by the solid line arrow in FIG. 3 to rotate the arm ARM to the fuel injection side, as in the above-described starting operation from the temporarily stopped state. The injection pump stop lever SL is moved to the starting position.

[0028]

As described above, according to the present invention, the rotation of the stop motor is stopped halfway when the key switch is turned off and then turned on. There is an effect that it is possible to prevent that the relay contact remains in the open state and the engine cannot be started.

Further, by providing the key switch with the lock relay, it becomes impossible to perform the engine stop operation by the key switch while the engine is operating, and the engine is always stopped by the stop switch. There is no chance that the engine will not start.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an engine stop operation according to the embodiment of the present invention.

FIG. 3 is a diagram illustrating an engine starting operation from a temporarily stopped state in the embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a main part of a conventional example.

[Explanation of symbols]

 KS key switch SR stop relay M stop motor SS stop switch R1 first relay R2 second relay RR holding operation release reset relay SW starter switch BR battery relay E battery BSF battery switch (front) BSR battery switch (rear) PR power relay LR lock relay ARM arm SP spring SL injection pump stop lever CB cable mr, mr1, mr2 contact

Claims (2)

[Claims] 1. A stop relay (SR) inserted in a circuit in which a current disappears when a key switch (KS) is cut off, and a drive current in a stopping direction is supplied through a break contact of the stop relay. In an engine stop device equipped with a stop motor (M) that is activated, a stop switch (S
S) is provided in the driver's seat, and the operation-holding type first relay (R1) to which the starting current is supplied via this stop switch
And a second relay (R2) to which a current is supplied through the make contact of the first relay, and a current for supplying a current when the key switch is operated to the start position for releasing the holding operation of the first relay. With a reset relay (RR),
An engine stop device in which a break contact of the second relay is inserted in a current path of the stop relay (SR). 2. A lock relay (LR) is provided for mechanically prohibiting the key switch (KS) from being turned off when the key switch (KS) is in a conductive position, and the lock relay is the stop relay (SR). The engine stop device according to claim 1, which is connected so as to interlock with the engine stop device.