JPS61132759A - Complete explosion correcting device for automatic choke in engine for vehicle - Google Patents

Abstract

PURPOSE:To regulate the complete explosion opening of a choke valve according to an atmospheric pressure, by a method wherein an atmospheric pressure responding member is coupled to the actuating spring of the complete explosion actuator of a carburetter. CONSTITUTION:The opening of a choke valve 2 of a carburetter 1 is controlled through the working of a bimetal 9, a negative pressure in a n intake air pipe is guided through a pipe 7 to a chamber 3 of a diaphragm 4, and the choke valve 2 is released by a given opening by means of the negative pressure in the intake air pipe during complete explosion of an engine. An atmospheric pressure responding bellows 13 is coupled through a lever 14 to a spring retainer 11 for a spring 5 of the diaphragm 4. Since, when an atmospheric pressure is low at a highland, the bellows 13 is expanded and the spring 5 is stretched, the choke valve is opened more widely than that at a lowland by means of a negative pressure produced during complete explosion, and this prevents excessive increase of an air-fuel ratio.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a complete explosion correction device for an automatic choke in a vehicle engine, and more particularly to an automatic choke that can satisfactorily correct the complete explosion amount and the complete explosion spring tension in response to changes in environmental conditions (atmospheric pressure). This is related to the choke's complete explosion correction device.

[Conventional technology]

FIG. 2 shows a schematic configuration of a conventional complete explosion correction @ arrangement in an automatic choke in this type of vehicle engine. That is, in FIG. 2, reference numeral 1 indicates a main body of a two-barrel type carburetor, and reference numeral 2 indicates a primary main body of the main body 1.
An automatic choke butterfly valve arranged in the side intake passage, 3 is a complete explosion diaphragm 4 and its return, and a complete explosion diaphragm with an effective complete explosion spring 5, and 6 is a connection linking the choke butterfly valve 2 and the complete explosion diaphragm 4. A rod, 1 is an inlet for introducing negative pressure into the suction pipe into the complete explosion diaphragm chamber 3, 8 is a choke lever for operating the choke butterfly valve 2, and 9 is a choke lever for gradually opening the butterfly valve 2 as the temperature rises. 10 is a P'l'' C heater that heats the bimetal under predetermined conditions.However, in this conventional automatic choke complete explosion correction device, when the engine is started cold, In this case, if the complete explosion amount is set to a large value, immediately after the engine is started, suction pipe negative pressure will act on the complete explosion diaphragm chamber 3 of the device through the introduction lower, and this negative pressure will suddenly cause the automatic choke to close. The butterfly valve 2 is opened beyond a predetermined level, and as a result, the air-fuel ratio is also rapidly diluted, causing the engine to stall.In other words, engine stalling (hereinafter referred to as complete engine stalling) may occur.Therefore, this can be avoided. In order to achieve this, if the complete explosion amount is set small, even in this case, after the engine has started.When the engine is in a state where fuel is stably sucked out from the main nozzle, the complete explosion will occur first. Since the amount is made small, the choke effect is excessive and the air-fuel ratio becomes excessively enriched, and the rotational operation of the engine is not smoothed out, resulting in so-called bumping of the engine drive.
Here again, there is a habit of stalling the engine due to this bumping, and when accelerating after a cold start, the choke butterfly valve 2 due to its strong suction force.
Similarly, the air-fuel ratio is suddenly opened and the air-fuel ratio is diluted, resulting in phenomena such as stumpling, hesitation, and lean surge. Conventionally, in order to solve these problems, the complete explosion amount in the device is set to a certain degree, and the tension of the complete explosion spring 5 for returning the complete explosion diaphragm 4 to counteract the negative pressure action of the suction pipe is increased. This is because even if the suction pipe negative pressure acts on the complete explosion diaphragm chamber 3 after a cold start, the complete explosion diaphragm 4 is activated gradually because the tension of the complete explosion spring 5 is large. Therefore, the choke butterfly valve 2 is not opened suddenly, but only after the fuel has been sufficiently sucked out from the main nozzle to reach the initially set full explosion amount. Even if the engine speed is set to a certain degree, there will be no engine stall during a cold start, and the engine rotation will become unstable after a cold start due to the large full explosion m, and the strong suction force during acceleration will cause the engine to stall. This improves the sudden opening operation of the choke butterfly valve 2. In other words, conventionally, these disadvantages have been dealt with by increasing the tension of the complete explosion spring 5.However, in the case of such conventional means, However, since the tension of the complete explosion spring 5 is simply increased, it is natural that, for example, at high altitudes where atmospheric pressure is low,
The suction pipe negative pressure also becomes small, and the complete explosion diaphragm 4 cannot be operated properly due to the suction pipe negative pressure after a cold start. This has the drawback that it may even become impossible, and it has not necessarily been possible to simply increase the complete explosion spring tension. Note that Japanese Patent Laid-Open No. 55-93943 has proposed a device for correcting changes in the air-fuel ratio of a carburetor due to changes in atmospheric pressure.

[Purpose of the invention] The present invention was proposed in order to solve the above-mentioned conventional problems, and the present invention responds to changes in atmospheric pressure conditions, that is, changes in the environmental conditions given at that time, to increase the amount of complete detonation. It is an object of the present invention to provide a complete explosion correction device for an automatic choke that can appropriately and effectively correct the explosion spring tension. [Structure of the invention]

To achieve the above object, the present invention provides a complete explosion diaphragm that is suction operated by suction pipe negative pressure. A complete explosion correction device has a complete explosion diaphragm chamber consisting of a complete explosion spring for the complete explosion spring, and a choke butterfly valve is operated in conjunction with the operation of the complete explosion diaphragm. A spring receiver that sets the spring tension depending on its support position, a metal bellows that expands and contracts in response to atmospheric pressure as the Ila condition, and a lever that moves the support position of the spring receiver by the action of the metal bellows. The present invention is characterized in that the tension of the complete explosion spring can be corrected to be large in lowland conditions where atmospheric pressure is high and to be small in highland conditions where atmospheric pressure is low.

【Example】

Hereinafter, one embodiment of the automatic choke complete explosion correction device according to the present invention will be described in detail with reference to FIG. FIG. 1 is an explanatory diagram showing the outline of the apparatus of this embodiment. In the apparatus of the embodiment shown in FIG. 1, the same reference numerals as those of the conventional apparatus shown in FIG. 2 indicate the same or corresponding parts. The complete explosion spring 5 is supported by the spring receiver 11, and the spring receiver 1
A rod 12 extended from 1 is taken out to the outside of the complete explosion diaphragm chamber 3, and is separately supported on a metal bellows 13 that expands and contracts under the action of atmospheric pressure and is swingably supported on a suitable support shaft 15. These rods 12 and metal bellows 13 are interconnected, J5] metal bellows 13
A lever 14 is provided to transmit the telescopic operation of the rod 12 to the rod 12. Here, the support position of the spring receiver 11 that supports the complete explosion spring 5 is set at a position where the tension of the complete explosion spring 5 can be exerted strongly to a certain extent at the atmospheric pressure 160111)-Ig, and in the low ground in front and behind. The amount of complete II is also set to be optimal at the same location, and as a result, as the atmospheric pressure changes as an environmental condition, that is, the surrounding environment moves from lowland to highland, in other words, as the altitude increases. As the atmospheric pressure decreases, the metal bellows 13 gradually expands and expands. , Kanbaku Spring 5
When the atmospheric pressure increases due to movement from a highland to a lowland, the support position of the spring receiver 11 changes due to the contraction of the metal bellows 13. , the complete explosion spring 5 is moved in the direction of increasing tension, and in each of these cases, a cold start is performed. In addition, the engine rotation after a cold start, and by extension the driving performance of the vehicle, etc., can be maintained at their best at all times. Therefore, in the configuration of the device of this embodiment, when the engine is in a cold state, the choke bimetal mechanism 9 contracts, the choke butterfly valve 2 is closed, and the choke operation becomes possible. When the engine is started in this state, that is, in a cold state, and a complete explosion occurs, the suction pipe negative pressure is introduced into the complete explosion diaphragm chamber 3 via the suction pipe negative pressure introduction lower, and the suction force of the negative pressure causes the spring receiver 11 to The diaphragm 4 is moved against the complete explosion spring 5 supported at a predetermined set pressure, and the choke butterfly valve 2 is moved via the rod 6.
It opens to let in outside air, mixes it with the fuel sucked out from the main nozzle to a predetermined air-fuel ratio, and is supplied to the engine to enable optimal combustion after completing gA. Opening degree of valve 2,
In other words, by optimally setting the combustion after complete explosion, stable engine rotation and drivability after the engine is started in a cold state are determined. In the case of this example device, when the engine is started in a cold state, at a low altitude where the atmospheric pressure as outside air is low,
After 60m1 HIJ, the operation of the metal bellows 13, which is contracted in response to this atmospheric pressure, is controlled by the spring receiver 1.
The distance between each fulcrum of the lever 14 that is transmitted to the lever 14. And/or by setting the capacity of the metal opening 13 appropriately, the spring receiver 11 is connected to the complete explosion spring 5.
The support position of the lens is set so that it is operated in a direction that reduces the perfect focus aperture. In other words, during a cold start at a low altitude, the tension of the explosion spring 5 is increased, and the length and bending of the rod 6 are adjusted so that the optimal explosion amount is achieved in this state. In this way, it is possible to completely eliminate the drawbacks of the conventional device in terms of cold starting of the engine, engine rotation after starting, running performance, etc. In addition, when the engine is started cold at a high altitude where the atmospheric pressure is low, as opposed to the above-mentioned cold start at a low altitude where the atmospheric pressure is high, the expansion operation of the metal bellows 13 causes a complete explosion spring to spring up. Spring receiver 1 for 5
By operating the support position 1 in the direction in which the completed explosion mold increases, that is, in the direction in which the tension of the complete explosion spring 5 is reduced, the suction pipe negative pressure at the time of a cold start at high altitude in the conventional device is reduced. This makes it possible to eliminate combustion instability after a cold start due to a decrease in the complete explosion m and a radical increase in the air-fuel ratio.

【Effect of the invention】

As described in detail above, according to the present invention, in a complete explosion correction device for an automatic choke in a vehicle engine, there is provided a spring receiver that supports a complete explosion spring for returning a complete explosion diaphragm, and a spring support that extends and contracts in response to atmospheric pressure. The metal bellows are connected by a lever, and as the metal bellows operates, the tension of the complete explosion spring is corrected to be large at low altitude conditions where atmospheric pressure is high, and small at high altitude conditions where atmospheric pressure is low. It is possible to maintain an appropriate completion temperature at all times, and it is possible to start a cold engine appropriately and effectively under any environmental conditions, which is superior to conventional devices. By eliminating the complete engine stall during a cold start and being able to obtain an appropriate air-fuel ratio, it is possible to eliminate irregularities in engine rotation after a cold start, and to significantly improve acceleration performance. It also has excellent features such as being relatively simple and easy to implement.

[Brief explanation of drawings]

In the drawings, FIG. 1 is an explanatory view of the structure of an embodiment of an automatic choke complete explosion correction device according to the present invention, and FIG. 2 is a schematic illustration of a conventional example device. It is a configuration explanatory diagram. 1... Carburetor body, 2... Automatic choke butterfly valve, 3... Complete explosion diaphragm, 4... Complete explosion diaphragm, 5... Complete explosion spring, 1... Suction pipe negative Pressure inlet, 11... Spring receiver, 12... Spring receiver rond, 13...
・Metal bellows, 14...Lever, 15...Spindle. Figure 1 Figure 2

Claims (1)

[Claims] Complete explosion diaphragm operated by suction pipe negative pressure,
A complete explosion correction device has a complete explosion diaphragm chamber consisting of a complete explosion spring and a complete explosion spring for its return, and a choke butterfly valve is operated in conjunction with the operation of the complete explosion diaphragm. A spring receiver that sets the spring tension depending on the support position, a metal bellows that expands and contracts in response to atmospheric pressure as an environmental condition, and a lever that moves the support position of the spring receiver by the operation of the metal bellows. A complete explosion correction device for an automatic combustion engine in a vehicle engine, characterized in that the tension of a complete explosion spring can be corrected to be large in lowland conditions where atmospheric pressure is high and to be small in highland conditions where atmospheric pressure is low.