JP2566565Y2 - High altitude correction device for vaporizer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for correcting a high altitude of a vaporizer.

[0002]

2. Description of the Related Art Generally, a carburetor mounted on a vehicle such as a motorcycle is adjusted to an optimum mixing ratio at a low altitude, and when the vehicle is operated at a high altitude, the pressure becomes low. The density decreases, and as a result, the mixture supplied to the internal combustion engine becomes rich. Therefore, conventionally, a solenoid valve is provided in the air bleed passage of the carburetor, and when the air pressure becomes lower than a predetermined value, the solenoid valve is opened to increase the amount of air bleed and prevent the mixture from becoming excessively concentrated. Is being done. (See JP-A-60-256544)

[0003]

[Problems to be Solved by the Invention] On the other hand, engine malfunction due to rich air-fuel mixture at high altitudes appears remarkably in the rotation range above the medium speed, and hardly causes any problem in the rotation range below the medium speed.
However, in the above-described conventional example, the operation of the solenoid valve is turned on or off in accordance with the air pressure, so that during high altitude traveling, the concentration of the air-fuel mixture is reduced over the entire rotation range of the engine. There is a problem that the acceleration near the rotation becomes worse.

Further, the above-mentioned high altitude correction device is provided with air pressure detecting means for controlling the solenoid valve according to the air pressure. Since this air pressure detecting means is generally constituted by bellows, switches, etc. The cost was increased due to the increase in size and the number of parts.

According to the present invention, two switches are connected in series to a solenoid valve for controlling the amount of air bleed, and one switch is linked to a throttle control lever, and the other switch can be manually switched, thereby reducing the amount of air bleed. The purpose of the present invention is to perform the above control properly in accordance with the engine rotation speed, and to make this type of carburetor compact without using the air pressure detecting means.

[0006]

The present invention comprises a throttle lever connected to an accelerator operator, a throttle arm connected to a throttle valve and synchronized with the throttle lever via a spring, and a predetermined opening degree or more. A throttle control lever for engaging the throttle arm and controlling the throttle valve, and connecting the throttle control lever to a servomotor driven according to the engine speed. A solenoid valve that adjusts the amount of bleed air is placed in the passage, and two switches are connected in series to this solenoid valve, and one switch is linked to the throttle control lever so that it is turned on at a predetermined opening or more. And the other switch can be manually turned on / off.

[0007]

[Action] In general, when driving at high altitude in motorcycles and the like, the engine speed is extremely poor. Therefore, the driver can sufficiently detect the engine speed, and at that time the solenoid valve is turned on manually to correct the mixture concentration. One switch is designed to be manually turned on by the driver when the engine speeds up during high altitude running. When the throttle control lever is at or above a predetermined opening degree, that is, when the engine speed is at or above a predetermined value, the other switch is turned on by the throttle control lever. Therefore, when both switches are ON, that is, when the engine speed is higher than a predetermined speed during high altitude traveling, the solenoid valve is opened, the amount of air bleed is increased, and the rich mixture is prevented. On the other hand, when the vehicle shifts from high altitude traveling to low altitude traveling, the torque of the engine is extremely reduced due to the decrease in the concentration of the air-fuel mixture. The valve closes and the air bleed amount returns to the normal state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 is a vaporizer. The main body 2 is provided with an intake passage 3 therethrough. A throttle valve 5 faces the venturi section 4 of the intake passage 3 from above from the upper side so as to be able to advance and retreat. A main nozzle 6 is opened at the bottom wall of the intake passage 3 below the throttle valve 5, and the lower end of the main nozzle 6 communicates with the fuel chamber 8 below the oil level via a main jet 7. The throttle valve 5 has a jet needle 9
The jet needle 9 is inserted into the main nozzle 6. An air bleed chamber 10 is provided on the outer periphery of the main nozzle 6, and an air bleed passage 13 is connected to the air bleed chamber 10.

A throttle lever 16 is rotatably disposed in the upper chamber 15 of the throttle valve 5. The throttle lever 16 has a shaft 17 fitted to a bearing 18 formed on one side wall of the upper chamber 15, and a wire drum 19 is attached to an outer end thereof. A return spring 20 for urging the throttle lever 16 in the closing direction of the throttle valve 5 is disposed between the wire drum 19 and the carburetor body 2. The wire drum 19 is connected to an accelerator operation member 22 by a cable wire 21, and the throttle lever 16 is rotated with the operation of the accelerator operation member 22. A throttle arm 23 is rotatably fitted to the indoor side end of the shaft 17, and one end of a rod 24 is pivotally attached to a tip side of the throttle arm 23, and the other end of the rod 24 is connected to the throttle valve 5. Being pivoted. A spring 25 is disposed between the throttle lever 16 and the throttle arm 23 to bias the throttle arm 23 in the direction in which the throttle valve 5 opens.
Normally, the throttle arm 23 is synchronized with the throttle lever 16.

In the upper chamber 15, a throttle control lever 27 which engages with the throttle arm 23 when the throttle valve 5 has a predetermined opening degree or more is rotatably disposed. This throttle control lever 27 has its shaft 28
Is fitted to a bearing 29 formed on the side wall of the upper chamber 15. The outer end of the throttle control lever shaft 28 is connected to a servo motor 31. The servo motor 31 is driven by an output signal of a control circuit 32 for inputting and calculating an engine speed. Therefore, when the opening of the throttle valve 5 is equal to or greater than the predetermined opening, the throttle arm 23 is actuated by the throttle control lever 27 against the spring 25, and controls the throttle valve 5 to an optimum state according to the program of the control circuit 32.

The inlet side of the air bleed passage 13 is branched into two, one of which is provided with a solenoid valve 35 for adjusting the amount of bleed air. The solenoid valve 35 is a switch 3
It is connected to the battery 40 via 7 and 38.

The switch 37 is operated so that the throttle control lever 27 is turned on at a predetermined opening degree or more.
The switch 38 can be manually arbitrarily switched. Therefore, by turning on the manual switch 38 during high altitude traveling and off during low altitude traveling, both switches 37 and 38 are turned on when the engine is running at or above a predetermined rotational speed during high altitude traveling, and the electromagnetic valve 35 is opened to open the air valve. The bleed amount is increased. On the other hand, when driving on lowland, the manual switch 3
Since 8 is turned off, the solenoid valve 35 maintains the stopped state.

[0013]

As described in detail above, according to the present invention, two switches are connected in series to a solenoid valve for controlling the amount of air bleed, and one of the switches is controlled in accordance with the engine speed. In conjunction with the control lever, the other switch can be manually switched, so that the air bleed amount is properly controlled in accordance with the engine speed, and the engine performance can be kept good, and the air pressure can be maintained. Since there is no need to use detection means,
It is possible to reduce the size and cost of the vaporizer.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the vaporizer of the present invention.

FIG. 2 is a top view of the vaporizer of the present invention.

[Explanation of symbols]

 Reference Signs List 1 carburetor 3 intake path 5 throttle valve 16 throttle lever 23 throttle arm 27 throttle control lever 31 servo motor 35 solenoid valve 37 switch 38 switch

Claims (1)

(57) [Scope of request for utility model registration] A throttle lever connected to an accelerator operator, a throttle arm connected to a throttle valve and synchronized with the throttle lever via a spring,
A throttle control lever that engages with the throttle arm at a predetermined opening degree or more and controls the throttle valve;
In a carburetor in which the throttle control lever is linked to a servomotor driven in accordance with the engine rotation speed, an electromagnetic valve for adjusting the amount of bleed air is disposed in an air bleed passage of the carburetor. A vaporizer characterized in that one switch is connected in series, one switch is linked to the throttle control lever so that the lever is turned on when the opening is equal to or more than a predetermined opening, and the other switch can be manually turned on / off. High altitude correction device.