JP2507320Y2 - Diesel engine stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a stop device for a diesel engine.

[Conventional technology]

In a diesel engine, fuel cut, intake cut,
There is a method that uses both fuel cut and intake cut (for example, "Diesel Passenger Car, P235, 236", published by Grand Prix Co., Ltd. November 1, 1984, first edition).

In the method of stopping the engine by the fuel cut, the engine torque suddenly becomes zero, and the reaction causes the engine to vibrate significantly, which causes the vehicle body to vibrate.

Therefore, for example, as shown in FIG. 3 and FIG. 4, vibration can be reduced when the engine is stopped by a stopping method that uses both fuel cut and intake cut.

As shown in FIG. 3, during engine operation, the key switch 21 is in the ignition position X2 shown in FIG. 2, and the fuel cut solenoid 22 and the intake cut solenoid 23 of the ignition pump are connected to the ignition contact Y3 of the key switch 21. Are connected. As shown in FIG.
During operation of the engine, the vacuum solenoid valve 24 is in the ON state due to the atmosphere, and the shutter 25A of the intake shutter device 25 is in the fully open state.

In the intake shutter device 25, by releasing the excitation of the intake cut solenoid 23, the vacuum solenoid valve 24 shown in FIG. 4 is turned off, a negative pressure is introduced into the actuator 25B, the shutter 25A is fully closed, and the intake air is removed. It has a structure that shuts off.

[Problems to be solved by the device]

In the conventional configuration, when the engine is stopped, the second
Rotate and operate the key switch 21 shown in the figure clockwise to change from the ignition position X2 during operation to the OFF position X4,
The excitation of the fuel cut solenoid 22 and the intake cut solenoid 23 is released at the same time. At this time, the response of the intake cut is delayed with respect to the fuel cut. This is because it takes a predetermined response time after the excitation of the intake cut solenoid 23 is released until the negative pressure working chamber 25C is set to a negative pressure and the shutter 25A is closed.

Therefore, due to the delay of the intake cut, the effect of using the fuel cut and the intake cut together cannot be sufficiently exerted, and the vibration of the engine cannot be eliminated.

In addition, as a stop device for diesel engines,
The one shown in Japanese Patent No. 936 is known.

The present invention has been made in view of the above, and its purpose is to:
It is an object of the present invention to provide a stopping device for a diesel engine that reduces vibrations when the engine is stopped by making the fuel cut and intake cut timings almost the same with a simple electric circuit without changing the conventional key switch.

[Means for solving the problem]

To achieve the above object, the present invention provides a key switch connected to a battery with a battery contact, an accessory contact, an ignition contact and a starter contact, and by rotating and operating the starter position, the ignition position, the accessory position, and the OFF position. In the stop device of the diesel engine, the fuel cut solenoid and the intake cut solenoid of the injection pump are connected to the key switch that is in the position, the fuel is cut by the operation of the fuel cut solenoid, and the intake is cut by the operation of the intake cut solenoid. Connect the fuel cut solenoid and intake cut solenoid to the ignition contact of the switch, connect the fuel cut solenoid to the accessory contact, and connect the fuel cut solenoid to the battery via the relay. It was done.

[Operation] In the present invention, the fuel cut solenoid and the intake cut solenoid are connected to the ignition contact of the key switch during engine operation.

Operate the key switch to the OFF position At the accessory position while the engine is stopped, only the fuel cut solenoid is connected to the accessory contact, then it is turned OFF at the key switch OFF position and the fuel cut solenoid is also de-energized. To be done.

Therefore, without changing the conventional key switch, the connection between the fuel cut solenoid and the intake cut solenoid is slightly changed, and the fuel cut and intake cut timings are almost the same with a simple electric circuit that connects the relay to the fuel cut solenoid. be able to.

That is, the intake cut solenoid is deenergized earlier than the fuel cut solenoid is deenergized, and the response time until the intake shutter is closed is almost the same as the fuel cut timing, reducing vibration when the engine is stopped. To be done.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

A diesel engine stop device according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, and 4.

FIG. 1 is a circuit diagram of a stop device for a diesel engine according to an embodiment of the present invention, FIG. 2 is a state explanatory view of a key switch of the stop device, and FIG. An explanatory view is shown.

In FIG. 1, 1 is a battery, 2 is a key switch,
Reference numeral 3 is a relay, 4 is a diode, 5 is a fuel cut solenoid of an injection pump, and 6 is an intake cut solenoid.

The key switch 2 has a battery contact Y1, an accessory contact Y2, an ignition contact Y3, and a starter contact Y4, which are displayed in columns. Also, key switch 2
When is rotated / operated, the starter position X1, the ignition position X2, the accessory position X3, and the OFF position X4 are taken, displayed in a row, and mounted as shown in FIG.

At the starter position X1, the battery contact Y1, the ignition contact Y3, the starter contact Y4 and the lamp contact R are in conduction.

Battery contact Y at ignition position X2
1, the accessory contact 2 and the ignition contact Y3 are conducted, and at the accessory position X3, the battery contact Y1
And the accessory contact Y2 are in conduction.

The positive electrode of the battery 1 is connected to the battery contact Y1 of the key switch 2, the fuel cut solenoid 5 is connected to the accessory contact Y2, and the intake cut solenoid 6 is connected to the ignition contact Y3.

The fuel cut solenoid 5 is connected to the battery 1 via the relay 3, and a diode 4 is provided between the circuit A and an accessory part (not shown).
The relay 3 is for exciting the fuel cut solenoid 5 at the start of operation and can supply appropriate fuel.

The diode 4 prevents current from flowing through accessory parts such as an air conditioner and a radio at the time of starting operation thereof, and prevents the cranking rotation speed from decreasing.

Then, during engine operation, the key switch 2 is in the ignition position X2, and the fuel cut solenoid 5 and the intake cut solenoid 6 are connected to the ignition contact Y3 of the key switch 2.

When the engine is stopped, if the key switch 2 is operated / rotated to move from the ignition position X2 shown in FIG. 2 to the accessory position X3, only the fuel cut solenoid 5 is connected to the accessory contact Y2. This time,
The intake cut solenoid 6 is turned off.

According to the above configuration, while the engine is in operation, while the key switch 2 changes from the ignition position X2 to the OFF position X4, the intake cut solenoid 6 is de-energized at the accessory position X3, and as shown in FIG. When the shutter 25 of the take shutter device 25 reaches the OFF position X4, the excitation of the fuel cut solenoid 6 is also released, and the fuel is cut. In short, a series of operations for intake cut is performed before the fuel cut.

Therefore, when the intake cut is used together with the fuel cut, the intake cut solenoid is deenergized earlier than the fuel cut solenoid is deenergized, and the intake cut and the fuel cut are performed simultaneously or the intake cut is performed earlier than the fuel cut. As a result, the vibration when the engine is stopped can be reduced.

However, without changing the conventional key switch, the connection relationship between the fuel cut solenoid 5 and the intake cut solenoid 6 is slightly changed, and a simple electric circuit for connecting the relay 3 to the fuel cut solenoid 5 makes it possible to cut the intake cut and the fuel cut. Can be done at about the same time.

[Effect of device]

As described above, according to the diesel engine stop device of the present invention, while the engine is in operation, while the key switch is changed from the ignition position to the OFF position, the intake cut solenoid is operated and the excitation is released in the accessory position, The shutter of the intake shutter device operates and the intake air is cut. When the key switch reaches the OFF position, the fuel cut solenoid operates and the fuel is cut. In short, a series of operations for intake cut is performed before the fuel cut.

Therefore, when the intake cut is used together with the fuel cut, the intake cut can be performed earlier than the fuel cut, and an effect of reducing vibration when the engine is stopped is achieved.

Of course, the present invention has a mechanism for making the intake cut and the fuel cut almost at the same time, by slightly changing the connection between the fuel cut solenoid and the intake cut solenoid without changing the conventional key switch, and connecting the relay to the fuel cut solenoid. Since it is just a connection, it can be a simple electric circuit.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a stop device of a diesel engine according to an embodiment of the present invention, FIG. 2 is a state explanatory view of a key switch of the stop device, and FIG. 3 is a circuit diagram of a conventional stop device of a diesel engine, FIG. 4 is a sectional explanatory view of a conventional intake shutter device. 1 …… Battery 2 …… Key switch 5 …… Fuel cut solenoid 6 …… Intake cut solenoid X1 …… Starter position X2 …… Ignition position X3 …… Accessory position X4 …… OFF position Y1 …… Battery contact Y2 …… Accessory Contact Y3 …… Ignition contact Y4 …… Starter contact

Claims (1)

(57) [Scope of utility model registration request] 1. A key switch connected to a battery,
A battery contact, an accessory contact, an ignition contact and a starter contact are provided, and the fuel cut solenoid and the intake cut solenoid of the injection pump are connected to the fuel switch solenoid that is connected to the key switch that is rotated, operated to starter position, ignition position, accessory position, and OFF position. In a diesel engine stop device that cuts fuel by operating the cut solenoid and cuts intake air by operating the intake cut solenoid, connect the fuel cut solenoid and the intake cut solenoid to the ignition contact of the key switch, and connect the fuel to the accessory contact with the fuel. A stop device for a diesel engine, characterized in that a fuel cut solenoid is connected to a battery via a relay in addition to connecting a cut solenoid.