JP2605303Y2 - Engine start switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine start switch, and more particularly to an engine start switch that allows an operator to stop the engine with one touch when an unexpected failure such as an engine controller failure occurs. .

[0002]

2. Description of the Related Art FIG. 6 is a diagram showing an example of a prior art relating to an engine starting circuit and a fuel control circuit, wherein 1 is an engine, 2 is a starter, 3 is a battery, 4 is a start switch, 6 is a start controller, and 7 is a start controller. Water temperature sensor, 8 is a preheating tap, 9 is a cooling water level sensor, 10 is a parking brake sensor,
11 is a lubricating oil pressure sensor, 12 is a preheating controller, 13
Is a cooling water level monitor, 14 is a parking brake monitor, 15 is a hydraulic pressure monitor, 16 is a starting circuit, 17 is a safety relay,
18 is a throttle lever driving device, 19 is a fuel injection device, 20 is a throttle lever, 21 is an alternator,
Reference numeral 22 denotes meters, reference numeral 23 denotes a link, reference numeral 24 denotes a spring, reference numeral 25 denotes a starting preheating plug, reference numeral 26 denotes lighting, reference numeral 27 denotes radios, reference numeral 28 denotes a regulator, and reference numeral 29 denotes a fuel controller.

Next, the operation of the prior art will be described.
FIG. 7 is a diagram showing a connection relationship between a start key position of the start switch 4 and a connection terminal, and FIG. 8 is a diagram showing a connection relationship similar to FIG. 7 in another related art. 6 and 7 will be described below, and FIG. 8 is the same as FIG. 7 and will not be described. First, by turning the start switch 4 to the 3rd terminal, the B terminal of the start switch 4 connected to the battery 3 is connected to the 3rd terminal which is a preheating terminal.
Then , the + side of the battery 3 is connected to the preheating controller 12 of the starting controller 6, a start command signal is input to the preheating controller 12, and when the start switch 4 is released, the B terminal of the start switch 4 automatically changes to the OFF terminal. Back,
A current flows through the pre-heating plug 8 by the pre-heating controller 12 for a time corresponding to the cooling water temperature detected by the water temperature sensor 7 and pre-heating is performed for a predetermined time, and then the pre-heating is terminated. The operator is notified by a preheating end lamp (not shown).

Next, the start switch 4 is turned to the 1st terminal, and the B of the start switch 4 connected to the battery 3 is turned off.
After connecting the terminal and the first terminal which is a power switch terminal of a meter, a light, a radio, etc., the start switch 4 is further turned to the 2nd terminal, and the B terminal of the start switch 4 connected to the battery 3 is started. When the circuit 16, the starting preheating plug 25 and the second terminal connected to the power switches of the meters, lights and radios are connected, the starting preheating plug 25 is preheated and the starting current is supplied from the starting circuit 16 to the safety relay 17. Flows through the starter 2 to rotate the starter 2. At this time, since the detected oil pressure of the lubricating oil pressure sensor 11 is low, when a fuel increase signal is sent from the oil pressure monitor 15 to the solenoid 18a of the throttle lever driving device 18, the fuel injection device 19 of the engine 1 is connected via the rod 18b and the link 23. The throttle lever 20 for increasing or decreasing the injected fuel is operated in the fuel increasing direction to increase the injected fuel, thereby improving the startability. When the start of the engine 1 is completed, the engine speed becomes high and the alternator 21
Generated voltage is increased, thereby causing the safety relay 17
And the starter 2 stops. That
After that, the start switch is maintained at the 1st position and normal operation (immediate operation) is performed.
(The charging position of the battery). 19a is a rack and 20a is a pinion. When the engine 1 completes starting, the oil pressure detected by the lubricating oil pressure sensor 11 becomes high. Therefore, a fuel reduction signal is sent from the oil pressure monitor 15 to the solenoid 18a of the throttle lever driving device 18 via the fuel controller 29, and the throttle lever 20 operates in the fuel decreasing direction to decrease the injected fuel.

The above operation is performed when there is no abnormality in each part. When the amount of cooling water of the engine is smaller than the specified amount, the cooling water level monitor 13 is activated by the detection signal of the cooling water level sensor 9 and an alarm (not shown) of the meters 22 is shown. At the same time as sending a signal to the machine to issue a warning, a signal is also sent to the preheating controller 12 to stop preheating. Also, when the parking brake is not in the braking state, the parking brake sensor 1
0 signal from the parking brake monitor 14 to the meter 2
At the same time, a signal is sent to the alarm device (not shown) 2 to issue a warning, and at the same time, a signal is also sent to the preheating controller 12 to stop the preheating. Or slot Le lever drive 18 is a spring 24
The spring force is biased in a direction to zero injected fuel
You. Therefore, while the engine 1 is operating, the fuel controller 2
The failure of 9, when the solenoid 18a is cut off fuel control signal solenoid 18a is to demagnetize actuates a position of the throttle lever 20 is injected fuel becomes zero is configured to stop the engine 1 automatically ing.

[0006]

[Problems to be solved by the invention] In the prior art,
When the signal sent to the solenoid 18a of the throttle lever driving device 18 is interrupted due to failure of the fuel controller 29 or the fuel control signal circuit that outputs a fuel control signal to the solenoid 18a of the throttle lever driving device 18 while the engine 1 is operating. In this case, there is no problem because the injected fuel is automatically kept at zero by the spring force of the spring 24. However, when an unexpected situation such as a sudden increase in the signal sent to the solenoid 18a of the throttle lever drive device 18 due to a failure of the fuel controller 29 or the fuel control signal circuit of the throttle lever drive device 18 occurs automatically , Since the stop device does not operate, the operator needs to make an emergency stop. In such a case, the start switch 4 is always held at the first position while the engine 1 is operating.
An operation of turning to the FF position is required, but there is a drawback that urgently performing such an operation imposes a mental burden on the operator.

[0007] The present invention has been made in order to improve the defects of the prior, such as when something unexpected engine occurs the operator simply pressing the d <br/> engine by simply pressing the start key It is stopped, to provide a start-up switch of Rue engine and reduce the mental burden of the operator.

[0008]

A start switch for an engine according to the present invention includes a start switch and a start controller.
And fuel injection by the fuel control signal from the start controller.
And a throttle lever drive for controlling the increase and decrease of the charge
Engine start control switch
Install the engine emergency stop switch and insert it into the start switch.
The emergency stop switch of the engine is
Open and fuel input to throttle lever drive
By shutting off the control signal, the injected fuel is shut off and
The engine is stopped .

[0009]

Next, the operation and effect of the above configuration will be described. Do not turn the start key to the engine stop position
In addition , the engine can be stopped by a one-touch operation by pressing a start key . For this reason,
The emergency stop operation of the gin is easy and operation mistakes are prevented.
Safety is improved. Especially start switch and emergency stop
Compared to when the switch is installed in a different position,
The operator can focus on the start switch only,
Burden is reduced. Also, the existing engine start
Leave the power supply circuit or fuel control circuit intact and start
Because only the switch configuration needs to be changed,
Are also inexpensive.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 5 show the embodiment of the present invention. The same reference numerals are given to the same components as those of the prior art, and the description of the configuration and operation will be omitted. Figure 1 is a diagram showing a control circuit according to the starting switch of the engine in the embodiment of the present invention,
FIG. 2 is a diagram showing details of a start switch and an emergency stop switch when the start key is pressed in the control circuit diagram of FIG. 1;
FIG. 3 is a diagram showing details of a start switch and an emergency stop switch when a start key is pulled in the control circuit diagram of FIG. 1, and (A) in FIGS. 2 and 3 is a cross-sectional view taken along the line AA in (B). , (B) is a longitudinal sectional view at the center, (C)
FIG. 4 is a cross-sectional view taken along the line CC in FIG. 4B, FIG. 4 is a diagram showing a connection relationship between a starting key position and a connection terminal in the embodiment of the present invention, and FIG. 5 is the same as FIG. FIG. 4 is a diagram showing a connection relationship between a start key position and a connection terminal.

1 to 3, reference numeral 4 denotes a start switch body 4a, a first locking groove 4b, a second locking groove 4c, and an insulating plate 4.
d, 4g, 4h, and selection terminal 4e, terminal 4f (OF
F, 1st, 2nd, 3rd terminals), 5 is an emergency stop switch composed of a switch 5a, terminals 5b, 5d, and insulating plates 5c, 5e, and 30 is a head 30a and a locking portion 30b. , A reference numeral 31 denotes a locking piece, 32 denotes a spring, 33 denotes a dashboard, 34 denotes a cover, and 35 to 39 denotes wiring. Start switch body
A selection terminal 4e made of a spring material has a radius at the center of the lower end of 4a.
Mounted in the direction. Note that in FIG. 3, the same reference numerals as those in FIG. 2 are omitted. Also, FIG. 5 is the same as FIG. 4, and the description thereof is omitted.

The operation of the configuration of the embodiment will be described.
You. From the state of FIG. 2 (an emergency stop state described later),
When starting the engine 1 , the start key 30 is turned on.
3r from the position (OFF position) inserted into the switch body 4a
d Turn slightly in the direction of the terminal to lock the start key 30
Is locked to the start switch body 4a. Has a head 30a of the start key 30 in this state, the starting Sui that pulling upward
Since the switch body 4a is pushed upward, the locking piece 31 comes out of the first locking groove 4b of the start switch 4 against the spring force of the spring 32 . Further, the head 30a of the start key 30 is
The engaging piece 31 is pulled upward first Ri by the spring force of the spring 32
Ing to the state of FIG. 3 by engaging the 2 locking grooves 4c. At this time, the switch 5a of the emergency stop switch 5 comes into contact with the terminals 5b and 5d, and electricity is supplied from the battery 3 to the relay coil 40 .
Therefore, the relay coil 40 is excited . Therefore ing and status can relay contact 41 outputs a fuel control signal to the solenoid 18a of the throttle lever drive device 18 is closed. Therefore , the start key 30 is rotated as in the prior art.
Thus, the engine 1 can be started and stopped. this
Selection terminal 4e Hajime Toki switch 4 because it is constituted by a spring member, and moves the start switch body 4a is vertically
Also, always terminal 4f (OFF, 1st, 2nd, 3rd
Each terminal) is biased in the direction of.

As described above, the state of FIG.
Normally, the engine 1 is started by the rotation of the start key 30.
Can be operated to stop. That is, after the start switch 4 is turned to the 3rd terminal and the operator detects that the preheating is completed by a preheating end lamp (not shown) installed on the meters 22, the operator turns the start switch 4 to the 1st terminal and further 2nd. When the B terminal of the start switch 4 connected to the battery 3 by turning to the terminal is connected to the 2nd terminal connected to the start circuit 16, the start preheating plug 25, and the power switches of the meters, lights, and radios, The starting preheating plug 25 is preheated, and the starting current is supplied to the starting circuit 16.
Flows through the safety relay 17 to the starter 2 so that the starter 2 starts rotating. When the engine 1 completes starting, the starter 2 stops. When the engine 1 is started, the start controller 6 operates as in the case where the engine cooling water amount is smaller than a predetermined amount as in the related art, or when the parking brake is not in the braking state reliably, or when the engine 1 is operating. The fuel controller 29 operates in response to an abnormality detection signal from a sensor that does not
When the fuel control signal to the solenoid 18a is interrupted, there is no problem because the throttle lever 20 is operated to the position where the injected fuel becomes zero by the spring force of the spring 24 and the engine 1 is automatically stopped.

However, an unexpected situation such as a sudden increase in the fuel control signal sent to the solenoid 18a of the throttle lever drive unit 18 due to a failure of the fuel controller 29 or the fuel control signal circuit of the throttle lever drive unit 18 has occurred. In the case of a sudden situation such as time, the start key 30 ( from the state shown in FIG. 3) is held at the first position while the engine 1 is operating.
The head 30a ) . Then, the start key 30
The start switch body 4a is moved downward by being pushed by the tip.
Because, against the spring force of the locking piece 31 spring 32 escape from the second engaging groove 4c of the starting switch body 4 a. further
When the head 30a of the start key 30 is pushed downward, the locking piece 31 is pressed.
FIG There are engaged with the first locking groove 4b by the spring force of the spring 32
The state becomes 2. At this time, apart from the emergency stop switch 5 of the switch 5a is terminal 5b, 5d, relay coil 40 for energization from the battery 3 to <br/> relay coil 40 is interrupted is demagnetized. Therefore fuel control signals sent form the relay contact 41 is opened <br/> Te to the solenoid 18a of the throttle lever drive device 18 is cut off, throttle lever 2
0 engine 1 operates in a position injected fuel by the spring force of the spring 24 becomes zero to stop automatically. Therefore, the operation
The rotator rotates the start key 30 to the normal stop OFF position
You don't have to. At this time, the operator presses the start key 3
Holding the head 30a of 0 and pulling it upward, as shown in FIG.
If the engine 1 is started,
The start key 30 is connected to the start switch body 4a in the same manner as in the technology.
The engine 1 can be started and stopped by inserting it into the key hole.

Further, in the embodiment, when an unexpected situation occurs in the engine 1, the engine 1 is emergency-stopped. However, the operation of the load can be neutralized by operating the emergency stop switch 5. For example, the load can be stopped urgently even when the engine 1 is operating. For example, in a known hydraulic excavator, when an operation valve of a hydraulic actuator is of a pilot pressure control type, an on-off valve that shuts off the pilot pressure may be provided, and the pilot pressure is operated by a proportional solenoid valve. In this case, a switch for interrupting the electric signal of the proportional solenoid valve may be provided.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram in which an embodiment is mounted .

FIG. 2 is a detailed cross-sectional view of the embodiment, (A) is a plan view,
(B) is a side sectional view, and (C) is a bottom view.

FIG. 3 is an operation diagram of FIG . 2, (A) is a plan view, and (B) is a side view.
Sectional view, (C) is a bottom view.

FIG. 4 is a connection relation diagram between terminals in the embodiment .

FIG. 5 is another connection relation diagram between terminals of the embodiment .

FIG. 6 is a diagram of a start switch control circuit of the prior art.

FIG. 7 is a connection diagram between terminals according to a conventional technique.

FIG. 8 is another connection relation diagram between terminals of the prior art.

[Explanation of symbols]

1; engine; 3; battery; 4; start switch,
4a: start switch main body, 4b: first locking groove, 4
c: second locking groove, 4e: selection terminal, 5: emergency stop switch, 5a: switch, 5b, 5d; terminal, 1
8; throttle lever driving device; 19; fuel injection device; 20; throttle lever; 23; link;
Reference numeral 4: Spring, 29; Fuel controller, 30; Start key, 30a; Head, 30b; Locking section, 31; Locking piece, 32; Spring, 35 to 39; Wiring, 40; Relay coil, 41;

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-58-70051 (JP, A) JP-A-57-104420 (JP, A) JP-A-4-36029 (JP, A) JP-A-3-3 264738 (JP, A) Japanese Utility Model 3-19442 (JP, U) Japanese Utility Model 55-1105 (JP, U) Japanese Utility Model 64-13268 (JP, U) Japanese Utility Model 57-150241 (JP, U) Japanese Utility Model Application No. Sho 60-134082 (JP, U) Japanese Utility Model Application No. Sho 62-21472 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02D 11/00-17/04 F02N 1/00 -15/00

Claims (1)

(57) [Scope of request for utility model registration] A start switch (4) and a start control
(6) and a fuel control signal from the starting controller (6).
Throttle lever drive that controls the increase or decrease of injected fuel
And a fuel control device for an engine having an engine (18).
And the engine emergency stop switch (5)
Start key inserted into the start switch (4)
(30) Pressing the engine emergency stop switch (5)
Open and input to the throttle lever drive (18).
Injecting fuel is blocked by shutting off the fuel control signal
An engine start switch for shutting down and stopping the engine (1) .