JPS60135658A - Pretreating device of fuel for internal-combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention uses exhaust gas to produce part of the fuel? The present invention relates to a fuel pretreatment device for an internal combustion engine that heats the fuel.

[Prior art]

In a typical internal combustion engine, air and fuel are metered and mixed in a predetermined ratio using a carburetor, and the mixture is supplied into the cylinder from the intake manifold. This mixture turns into a gas in the cylinder by the end of the compression stroke, mostly due to the heat of the engine, and explodes with the spark of the ignition plug, and the burned gas is dissipated into the atmosphere through the exhaust manifold and muffler. be done.

In the case of a multi-cylinder engine, air-column vibration caused by inertial pulsation may result in uneven supply of air-fuel mixture, resulting in insufficient output, increased fuel consumption, and uneven rotation. Also, from the point of view of fuel economy, when the air-fuel mixture becomes leaner than the maximum economy point, the fuel consumption rate increases. For this reason, for example, in order to reduce fuel consumption at low speeds, some modifications have been made to the slow speed system, but if the throttle adjustment is made too large, the engine may not start in a cold state until it warms up. [Objective of the Invention] The present invention improves distribution performance by heating a part of the fuel using exhaust gas, heating and vaporizing the fuel, and supplying the heated vaporized mixture to the combustion chamber. This is to improve fuel efficiency and reduce fuel consumption.

[Structure of the invention]

In the present invention, a heating cylinder is disposed in the middle of a fuel branch passage branched from a fuel pipe upstream of the carburetor, and heats the fuel in the branch passage by a heat dissipation section formed by an exhaust branch passage led from an exhaust manifold. An opening is opened in the intake pipe or intake manifold downstream of the full throttle knob at the tip of the branch passage, and the fuel vapor generated by heating and the air-fuel mixture from the carburetor are mixed and supplied to the combustion chamber.

In carrying out the present invention, it is preferable to slightly reduce the amount of main fuel discharged in a conventional carburetor.

For this reason, the main nozzle is narrowed down or the air bleed amount is adjusted in a row. In addition, inside the heating cylinder, a heat transfer part in which fuel branch paths are arranged in a coiled or spiral shape is placed in the upper part of the cylinder, and a coiled or spiral exhaust gas heat dissipation part led from the exhaust manifold is placed inside the cylinder. Place it at the bottom of the . In this way, they are wound in a coiled or spiral shape to cover the entire surface of the heat transmission and radiation area, and are arranged above and below to increase heat transfer efficiency. In addition,
A flow rate adjustment valve is installed in the fuel branch path and exhaust branch path at a position upstream of the heating cylinder, and the ratio of mixture to fuel vapor is adjusted within the range of 5:5 to 5:3 depending on the operating conditions. It is.

〔Example〕

The drawing shows an example of the device of the present invention, in which (1) is a fuel tank, (2) is a strainer, (3) is a fuel pump, and (4) is a fuel tank.
) is the air cleaner, (5) is the vaporizer, (6) is the heating cylinder,
(7) is the combustion chamber of the engine, (8) is the piston, (9)
is the intake manifold, and αO is the exhaust manifold.

There is a fuel branch path Q21 in the middle of the fuel nozzle (11) leading from the fuel pump (3) to the carburetor (5). The entire flow rate adjustment valve 03) is inserted into the heating tube (6) along this branch path U, led out to the outside through the coiled heat transfer part α41, and beyond that the entire throttle valve (15 ) is opened to the discharge port +17) in the intake cylinder (1G) downstream. A heat transfer section (a coiled heat dissipation section (support) below 141) is arranged in the heating cylinder (6), and this heat dissipation section ■
is led out from the exhaust manifold (l) and is connected to the exhaust pipe (211
It is formed in the middle of a branch road (branch) that returns to . Heating tube (
6) A flow rate adjustment valve (c) is provided at the branch path at the upstream position to control heat radiation mk. Although the above-mentioned flow rate regulating valve station a (2O) is a normal manually operated knob, it may be a wire remote control type sea electromagnetic knob. Furthermore, it may be a nozzle controlled by a signal from an electronic fuel control device.

The fuel that has entered the float chamber (181) of the carburetor (5) is discharged from the main nozzle (19) and mixed with air from the air cleaner (4) to form a predetermined air-fuel mixture.
and flows to the intake manifold (9). On the other hand, when the engine is running, high-temperature exhaust gas is generated and is dissipated into the atmosphere via the exhaust pipe (exhaust pipe equipment), but a portion of the exhaust gas passes through the exhaust gas branch path separated from the exhaust manifold (0Q) and passes through the entire heating tube ( 6)
The temperature inside the cylinder increases as the heat is radiated through the heat radiating section. It's increasing. The temperature of the heat transfer part of the branch passage separated from the fuel pipe 01) is raised in the cylinder, and the fuel in the pipe is vaporized and released from the outlet (171) downstream of the throttle and 2 lubricants.
It is mixed with the air-fuel mixture and supplied to the combustion chamber (7). In this way, the fuel vapor from the exhaust gas and the air-fuel mixture in the vaporizer are completely mixed and supplied, resulting in good distribution efficiency and combustion efficiency.

In addition, although the heating cylinder (6) is attached to the inner wall with a heat insulating material as shown in the illustrated example, it may be entirely covered with a heat insulating material. In addition, the heat transfer part and heat dissipation part are not limited to coil shapes.
It may have a spiral shape or other shape with a large heat transfer and heat radiation area.

Figure 2 shows another embodiment, in which the tip of the fuel branch path (1z) is not inserted into the intake cylinder of the carburetor, but is opened at the discharge port (5) provided in the intake manifold (9). In this case, some or all of the fuel vaporized on the heat transfer section side is discharged into the intake manifold (9) and then transferred to the vaporizer (5).
Since the mixture is supplied to the combustion chamber (7), high output operation is easily achieved by increasing the fuel ratio in the branch passage to the mixture from the carburetor. 1st
It may be a closed type as shown in the figure, but small holes (5) (supports) may be provided at the top and bottom as shown in Fig. 2 to prevent extreme temperature rise inside the cylinder.

〔Effect of the invention〕

According to the present invention, a portion of the fuel is heated using exhaust gas, and this is mixed with the air-fuel mixture from the carburetor and supplied into the intake passage downstream of the throttle valve, thereby reducing fuel consumption. can save significantly (for example, 20-50%). Furthermore, since the fuel to be heated is branched from the fuel pipe, the passage from the fuel pump to the carburetor inlet joint can be maintained at a low temperature, making it possible to prevent problems such as percolation. Moreover, since there is no discharge of heated fuel during low-temperature starting, and only the slow system of the carburetor is used, there are no troubles during starting, and there are no problems with the mixture ratio becoming too rich during high-speed operation.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the arrangement of various parts of the apparatus of the present invention, and FIG. 2 is a sectional view of another embodiment. (5): Carburetor (6): Heating cylinder (7): Combustion chamber (9): Intake manifold α0: Exhaust manifold fill: Fuel pipe 021: Fuel branch path α31 (23N flow rate adjustment valve α41' Heat transfer part f
151: Throttle valve 06): Intake cylinder (171
@: Discharge port (211: Exhaust pipe: Exhaust gas branch path Patent applicant: Yamagishi - Ushiro Masato Ashi 1) Naoe

Claims (4)

[Claims] (1) A heating tube is placed in the middle of a fuel branch path branching from the fuel tube upstream from the carburetor to heat the fuel in the branch path using exhaust gas, and the heat generated by the fuel branch path inside the heating tube is A fuel pretreatment device for an internal combustion engine, characterized in that the tip of the branch passage opens into an intake passage downstream of a throttle knob in order to mix fuel vapor with an air-fuel mixture from a carburetor and supply the mixture to a combustion chamber. . (2) The fuel pretreatment device for an internal combustion engine according to claim 1, wherein the tip of the fuel branch passage is opened to the intake manifold. (3) The heating cylinder has a built-in heat transfer section in which fuel branch paths are wound in a coiled or spiral shape, and an exhaust gas heat radiation section in which the exhaust branch paths led from the exhaust manifold are similarly wound in a coiled or spiral manner. A fuel pretreatment device for an internal combustion engine according to claim 1. (4) The fuel pretreatment device for an internal combustion engine according to claim 3, wherein the fuel branch passage and the exhaust branch passage each have a flow rate regulating valve at a position upstream of the heating cylinder.