JPH0680310B2 - Engine ignition control device for vehicles for cold regions - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention provides a plurality of carburetors configured to open and close a bore for supplying an air-fuel mixture to an engine by means of a slidably provided cylindrical throttle valve. The present invention relates to an engine ignition control device in a vehicle for cold regions such as a small snow vehicle equipped with a multi-cylinder engine equipped with the engine.

[Prior art]

In vehicles for cold regions equipped with this type of carburetor, the sliding part between the cylindrical throttle valve and the main body or the throttle cable freezes during operation, and the opening of the carburetor remains open even if the throttle lever is returned. It may not be small and the engine may be out of control. As a countermeasure, for example, there is an ignition control device according to US Pat. No. 3,789,938. As shown in FIG. 4, when the carburetor is at the idle opening, the operation control terminal 4a of the ignition device 4 that causes the spark plug 6 of the engine to generate a spark via the ignition coil 5 using the flywheel magneto 1 as a power source is set. The carburetor switch 2 that is turned on only and the throttle switch 3 that is turned off only when the throttle lever is returned are grounded via a circuit connected in parallel. According to this, when the throttle lever is returned (throttle switch 3 is turned off) but the carburetor does not become the idle opening degree due to freezing or the like (the carburetor switch 2 is also off), the operation control terminal The engine can be stopped by canceling the grounding of 4a to interrupt the operation of the ignition device 4. In normal operation, the throttle switch 3 is turned on in the idle state, the carburetor switch 2 is turned on, and in the running state, the carburetor switch 2 is turned off but the throttle switch 3 is turned on.
The operation control terminal 4a is always grounded and operates normally. A technique similar to the above is described in Japanese Patent Application No.
No. 228118 (see JP-A-59-122740).

[Problems to be solved by the invention]

When applying the above prior art to a multi-cylinder multi-vaporizer engine, it is necessary to provide an ignition control device for each vaporizer,
Not only the structure becomes complicated, but if only one carburetor freezes, the operation of the ignition device of that cylinder will be interrupted if the throttle lever is returned, but the other cylinder will operate normally, so depending on the condition Continue idling. In this case, although combustion is not performed despite the mixture being sent from the carburetor to the cylinder in which the operation of the ignition device has been interrupted, the spark plug becomes moist, and as a result, the subsequent operation of the cylinder is disabled, Restoration will require considerable effort.

Especially in a multi-cylinder multi-vaporizer engine equipped with a plurality of carburetors that open and close the bore that supplies the air-fuel mixture to the engine with a slidably provided cylindrical throttle valve, activate the carburetor switch. In addition, it is necessary to provide a notched slope at the tip of the throttle valve for adjusting the idle opening, but this notched slope affects the shape of the intake passage when the carburetor is at a low opening, so If it is not made small, intake air may be disturbed and become unstable, which may result in unstable engine operation.

If any one of the plurality of carburetors of the present invention cannot be closed due to freezing, the ignition operation of all the cylinders is interrupted, and the notch slope is devised to solve the above problems.

[Means for solving problems]

To this end, the present invention, as shown in FIGS. 1 to 3, employs a plurality of vaporizers configured to open and close a bore 27 that supplies an air-fuel mixture to an engine by means of a slidably provided cylindrical throttle valve 28. In a vehicle for cold climates equipped with a multi-cylinder multi-carburetor engine equipped with a gas generator, one ignition device 11 that operates the spark plugs 13 and 13A of each cylinder and the throttle valve 28 of each vaporizer 25 and 25A are interlocked. A throttle control device 40 that simultaneously slides and opens and closes the bore 27 and a throttle switch 30 that is provided in association with the throttle control device and that operates only when the throttle control device is not returned.
And a pair of notched slopes 28a, 28b formed on both sides of the tip of the throttle valve 28 facing each other, and one of the notched slopes attached to the main body 26 of each carburetor 25, 25A.
A plurality of carburetor switches 20, 20A that have an actuator 21a that can move in a direction intersecting with 28a and that is actuated by being pressed by the notched slope, and the main body 26 of each carburetor 25, 25A. Is equipped with an idle screw 29 for adjusting the idle opening degree of each of the shuttle valves 28 with the tip 29a abutting on the other notched sloped surface 28b that is screwed into the plurality of carburetor switches 20, 20A A second switch circuit S1 is formed which operates as a whole only when it is operated, and the first switch circuit S1 and the throttle switch 30 are connected to each other to operate as a whole.
A switch circuit S2 is formed, and the second switch circuit S2 is connected to the operation control terminal 11a of the ignition device so that the ignition device operates only when the second switch circuit is in the operating state. It is what

[Action]

According to the present invention having the above-described configuration, when each throttle valve 28 is at the idle opening degree, each carburetor switch 20, 20A is connected to each actuator 21.
a engages with the one notched slope 28a and operates. Further, the idle screw having the tip 29a engaged with the other notch slope 28b
The stop position of the throttle valve 28 is changed by 29 to adjust the idle opening degree.

In the normal operation, the throttle switch 30 is not operated in the idle state, but both the carburetor switches 20 and 20A are operated, so both the first and second switch circuits S1 and S2 are operated and the traveling state Then, both the carburetor switches 20 and 20A are deactivated, but the throttle switch 30 is activated, so that the second switch circuit S2 is activated, and in any case, the ignition device 11 is normally activated. However, the throttle control device 40
In the state in which the carburetor is returned to the normal state, if any one of the carburetors 25 and 25A does not return to the idle opening degree due to freezing or the like, one of the carburetor switches 20 and 20A becomes inoperative. Therefore, the first switch circuit S1 is inoperative, and the throttle switch 30 is also inactive, so the second switch circuit S2 is inactive and the ignition device 11 is interrupted.

〔The invention's effect〕

As described above, according to the engine ignition control circuit of the present invention, even if the throttle control device 40 is returned, if at least one of the plurality of carburetors 25, 25A does not return to the idle opening degree due to freezing or the like, the ignition device 11 suspends its operation. As a result, the engine stops immediately, and subsequent troubles due to the wetness of the spark plug of the cylinder of the frozen carburetor can be prevented.

In addition, the notch slope 2 that engages with the operator 21a of each carburetor switch 20, 20A and the tip 29a of the idle screw 29, respectively.
Since 8a, 28b are formed on both sides of the front end of the throttle valve 28 facing each other, each notch slope is sufficient for the minimum size and is distributed at the positions facing each other, so that the notch slope is small even when the throttle opening is small. Does not disturb the intake air passing through the intake passage and make the intake air unstable,
As a result, the operation of the engine does not become unstable.

Furthermore, each throttle valve 28 is
Both notch slopes 28a, 28b are actuators 21a of the carburetor switch 20, 20A.
And since it engages with the tip 29a of the idle screw 29,
The pressing forces due to these engagements cancel each other out. Therefore, the twisting of the throttle valve 28 at the idle opening is reduced, so that the problem that the operation of the throttle control device tends to be heavy at the start of operation, especially in the case of a multi-vaporizer engine, is alleviated.

〔Example〕

1 to 3 show an embodiment of a two-cylinder, two-carburetor engine, in which the ignition device 11 operates when the operation control terminal 11a is grounded, and the operation of switches means ON. It is a thing. As shown in FIG. 1, the ignition device 11 using the flywheel magneto 10 as a power source operates when the operation control terminal 11a is grounded, and the ignition coil 12
A spark is generated on the left and right spark plugs 13 and 13A connected via the. The left and right carburetor switches 20, 20A are connected in series to form a first switch circuit S1 and a throttle switch.
30 and the first switch circuit S1 are connected in parallel to form a second switch circuit S2, and the operation control terminal 11a is grounded via the second switch circuit S2.

As shown in FIG. 2, the left and right carburetors 25, 25A having carburetor switches 20, 20A, respectively, are opened / closed by a throttle control device 40. The carburetors 25, 25A have basically the same structure, and as shown in FIG. 2, a cylindrical throttle valve 28 is slidably provided on the main body 26 and reciprocated by a throttle control device 40 via a throttle cable 45. It operates to open and close the bore 27 that supplies the air-fuel mixture to the engine. First and second cutout slopes 28, 28b are provided on both sides of the tip of the throttle valve 28. When the body 21 of the carburetor switches 20, 20A is screwed and fixed to the main body 26 in a direction substantially orthogonal to the first cutout slope 28, and the throttle valve 28 descends and is in an idle state as shown in FIG. The actuator 21a is pressed by the first notch slope 28a to turn on the carburetor switches 20 and 20A, and the throttle valve
When 28 is raised and is not in the idle state, the pressing is released to turn it off. On the second notch slope 28b, an idle screw screwed into the main body 26 in the horizontal direction intersecting with the second notch slope 28b.
The tip 29a of 29 is engaged, and by moving the idle screw 29 forward and backward, the stop position of the throttle valve 28 is changed to adjust the idle opening.

The throttle control device 40 is, as shown in FIGS. 2 and 3,
It is composed of a lever holder 41 fixed to a handle lever 50 and a throttle lever 42. Axis at the base of the throttle lever 42
42a is held by the long hole 41a of the lever holder 41 so as to be slightly movable and rotatable. The lever holder 41 supports one end of the outer tube 45b of the throttle cable 45,
One end of the inner wire 45a engages with the intermediate portion of the throttle lever 42, and the throttle lever 4 between the engaging portion and the pivot 42a
2, the protrusion 42b is provided, and the throttle control device shown in FIG.
When 40 is returned, the protrusion 42b contacts the lever holder 41 so that the pivot 42a is located at the right end of the elongated hole 41a. The tip of the actuator 30a of the throttle switch 30 provided in the lever holder 41 is brought into contact with the left side of the pivot 42a, the throttle switch 30 is turned off in the state shown in FIG. 2, and the throttle control device 40 shown in FIG. When the actuator is operated, the actuator 30a is pushed by the pivot 42a so that the throttle switch 30 is turned on.

In the case of normal operation, the throttle switch 30 is returned to the throttle control device 40 as shown in FIG.
Is turned off, but both carburetor switches 20 and 20A are turned on, so both the first and second switch circuits S1 and S2 are turned on, the operation control terminal 11a is grounded, and the ignition device 11 operates normally. To do. When the throttle control device 40 is actuated from the state shown in FIG. 2, the throttle lever 42 first rotates about the protrusion 42b as a fulcrum as shown by the chain double-dashed line in FIG. 3, and the actuator 30a is pushed by the pivot 42a to push the throttle switch. 30 is turned on and then rotated as shown by the solid line to pull the inner wire 45a to open the throttle valve 28 of each carburetor 25, 25A and turn off each carburetor switch 20, 20A. In this state, the first switch circuit S1 turns off, but the throttle switch 30 turns on, so the second switch circuit S2 turns on and the ignition circuit 11 operates normally.

If the sliding portion between the cylindrical throttle valve 28 and the main body 26 or the throttle cable 45 freezes, even if the throttle control device 40 is returned, one or both throttle valves 28 of the carburetors 25, 25A will have an idle opening degree. Will not return to. In this state, one or both of the carburetor switches 20, 20A are off, so the first switch circuit S1 is off, and the throttle switch 30 is also off, so the second switch circuit S2 is off. Therefore, since the operation control terminal 11a is not grounded, the ignition circuit 11 and the operation are stopped, and the engine is stopped.

The intake passage formed by the tip of the throttle valve 28 and the bore 27 tends to be affected by the shape of the tip of the throttle valve 28 when the throttle opening is small. However, in the above embodiment, the actuator of each carburetor switch 20, 20A
21a and the notch slopes 28a, 28b that engage with the tip 29a of the idle screw 29 are formed on both sides of the tip end of the throttle valve 28 facing each other, so that each notch slope is sufficient in the minimum size and is facing each other. Therefore, even if the throttle opening is small, the notched slope does not disturb the intake air passing through the intake passage and the intake air becomes unstable, and the engine operation does not become unstable.

Also, each throttle valve 28 is
Both notch slopes 28a, 28b are actuators 21a of the carburetor switch 20, 20A.
And since it engages with the tip 29a of the idle screw 29,
The lateral pressing forces due to these engagements cancel each other out. Therefore, the twisting of the throttle valve 28 at the idle opening is reduced, and the problem that the operation at the start of the operation of the throttle control device tends to be heavy, especially in the case of a multi-vaporizer engine, is alleviated.

In the above embodiment, the case where the ignition device 11 operates when the operation control terminal 11a is grounded has been described, but the present invention is also implemented when the ignition device 11 stops operating when the operation control terminal 11a is grounded. can do. In this case, the actuation of the switches means off, the carburetor switches 20, 20A are turned off when the carburetors 25, 25A are at the idle opening, and the throttle switch 30 is the throttle control device 40. The carburetor switches 20 and 20A are connected in parallel to form the first switch circuit S1 and the throttle switch 30 and the first switch
The switch circuit S1 may be connected in series to form the second switch circuit S2.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a circuit diagram thereof, FIG. 2 is an overall explanatory view of an idle state, and FIG. 3 is an explanatory view of a throttle control device in a running state, Fourth
The figure is a circuit diagram of a conventional example. Explanation of symbols 11 …… Ignition device, 11a …… Actuation control terminal, 13,13A …… Ignition plug, 20,20A …… Vaporizer switch, 21a …… Actuator, 25,
25A ... Vaporizer, 26 ... Main body, 27 ... Bore, 28 ... Throttle valve, 28a, 28b ... Notched slope, 29 ... Idle screw, 29a ... Tip, 30 ... Throttle switch, 40 ... Throttle control device, S1 ... first switch circuit, S2 ... second switch circuit.

Claims (1)

[Claims] 1. A cold region equipped with a multi-cylinder multi-vaporizer engine having a plurality of carburetors configured to open and close a bore for supplying an air-fuel mixture to an engine by means of a slidably provided cylindrical throttle valve. In a vehicle, one ignition device for operating a spark plug of each cylinder, a throttle control device for simultaneously opening and closing the bore by interlockingly sliding a throttle valve of each carburetor, and this throttle control device are related. Attached to the body of each carburetor, and a throttle switch that operates only when the throttle control device is not returned, a pair of notched slopes formed on both sides of the tip of the throttle valve that face each other. Has an actuator movable in a direction intersecting one of the notch slopes, and the actuator operates by being engaged with the notch slope and being pressed. A plurality of carburetor switches, and an idle screw that is screwed into the main body of each carburetor and that engages with the other notched slope at its tip from the direction intersecting this and adjusts the idle opening of each throttle valve. Forming a first switch circuit that operates as a whole only when the plurality of carburetor switches are connected and all of them are operated, and the first switch circuit and the throttle switch are connected to operate any one of them. For example, a second switch circuit that operates as a whole is formed, and the second switch circuit is connected to the operation control terminal of the ignition device so that the ignition device operates only when the second switch circuit is in the operating state. An engine ignition control device for a vehicle for cold regions, which is characterized in that