JPH02201068A - Oxygen supplied engine - Google Patents

Abstract

PURPOSE:To prevent certainly drop of the engine output in a car equipped with a small-sized engine at the time of running up a slope by supplying oxygen simply according to the engine load when it has reached a certain value. CONSTITUTION:An engine 2 is equipped with a means 34 to supply fuel for ex. consisting of LNG(liquefied natural gas). A means 74 supplies oxygen according to the the load on this engine 2, when it has reached a certain value. This oxygen supply means 74 supplies for ex. liquefied oxygen in a container 76 to an oxygen heat exchanger 84 provided in the heat exchange chamber 46 of a heat exchanger 44 via a passage 82 fitted with a shutoff valve 78 and a filter 80, and also supplies gasified oxygen to a body suction passage 12 through a passage 88 fitted with regulator 86 and an oxygen amount control valve mechanism 90. That is, the valve element 104 is opened and closed according to the load applied to a pressure chamber 102 of the mentioned oxygen amount control valve mechanism 90.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oxygen supply engine, and more particularly to an oxygen supply engine provided with an oxygen supply means for simply supplying oxygen-enriched air at a required time.

[Conventional technology]

In an engine mounted on a vehicle, the required engine output changes depending on the driving state of the vehicle, so there is a device that changes the air-fuel ratio in order to obtain the required engine output. That is, this device improves combustibility by improving the mixing of fuel and oxygen-containing air, thereby obtaining the required engine output depending on the driving condition.

[Problem that the invention seeks to solve]

By the way, especially in vehicles equipped with small engines, when the load is large such as when driving uphill or at high speed, for example, when the intake pipe negative pressure (absolute value), which is the intake pipe pressure, becomes weak to a certain level. Another disadvantage is that the amount of oxygen in the air decreases, resulting in a decrease in engine output.

[Purpose of the invention]

Therefore, the purpose of this invention is to eliminate the above-mentioned disadvantages.
By supplying oxygen according to the engine enrichment state when the engine load reaches a predetermined value, it prevents the engine output from decreasing when driving on a hill or at high speed even in vehicles equipped with small engines. The object of the present invention is to realize an oxygen supply engine that can supply oxygen with a simple configuration.

[Means for solving problems]

In order to achieve this object, the present invention is characterized in that an oxygen supply means is provided for supplying oxygen according to the engine load state when the engine load reaches a predetermined value.

[Effect]

According to the configuration of the present invention, the oxygen supply means supplies oxygen to the engine according to the engine load state when the load increases and reaches a predetermined value when the vehicle is running uphill or at high speed. As a result, even in a vehicle equipped with a small engine, it is possible to prevent the engine output from decreasing during uphill driving, high speed driving, etc.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1.2 shows the first embodiment of the present invention. In FIG. 0, 2 is an engine, 4 is an air cleaner, 6 is an intake pipe, 8 is a pipe intake passage, 10 is a throttle body, 1
2 is a body intake passage, 14 is an intake throttle valve, 16 is an intake manifold, 18 is a manifold intake passage, 20 is an intake valve,
22 is a combustion chamber, 24 is a piston, 26 is a spark plug, 2 is an exhaust valve, 30 is an exhaust manifold, and 32 is a manifold exhaust passage. The engine 2 is supplied with fuel such as LNG (liquefied natural gas) by a fuel supply means 34 .

The fuel supply means 34 is configured as follows.

That is, the liquefied LNG from the LNG tank 36 is
A fuel heat exchange section 48 is provided in a heat exchange chamber 46 of a heat exchanger 44 provided midway through the intake pipe 6 via a first fuel supply passage 42 in which a fuel cutoff valve 38 and a fuel filter 40 are provided in sequence. is supplied to and vaporized. Further, the vaporized LNG from the fuel heat exchange section 48 is transferred to the fuel regulator 5.
The amount thereof is adjusted by 0 and guided to the engine 2 side by the second fuel supply passage 52. This second fuel supply passage 52 has a main branch passage 54 and a gII branch passage 56 on the tip side.
It is branched into.

A main stream outlet 58 of the main branch passage 54 is connected to the throttle body 1
It communicates with the body intake passage 12 immediately downstream of the venturi portion 60 of No. 0. In the middle of this main branch passage 54, a second fuel cutoff valve 62 and a main proportional control valve 64 are provided in order from the fuel regulator 50 side.

Further, the sub outlet 66 of the sub branch passage 56 communicates with the body intake passage 12 slightly downstream of the main stream outlet 58 of the main branch passage 54 and upstream of the intake throttle valve 14 .

Further, an auxiliary fuel valve 68 is provided in the middle of the sub-branch passage 56. This auxiliary fuel valve 68 includes an intake throttle valve 14
An auxiliary passage 72 having an open lower opening 0 communicates with the body intake passage 12 on the downstream side.

Further, when the load of the engine 2 reaches a predetermined value, the oxygen supply means 7 supplies oxygen according to the load state of the engine 2.
4 will be provided.

This oxygen supply means 74 supplies liquid oxygen from a liquid oxygen cylinder 76, such as a small liquefied oxygen cylinder for welding, for example.
A first valve provided with an oxygen cutoff valve 78 and an oxygen filter 80
The oxygen is supplied through the oxygen supply passage 8z to the oxygen heat exchange section 84 disposed in the heat exchange chamber 46 of the heat exchanger 44, and the amount of vaporized oxygen is adjusted by the oxygen regulator 86, resulting in a second oxygen supply. Oxygen is supplied to the body intake passage 12 from the passage 8 through the oxygen amount control valve mechanism 90.

The oxygen amount control valve mechanism 90 includes a first oxygen supply passage 88 formed by a first housing 92 to communicate with the second oxygen supply passage 88 .
A second chamber 100 and a pressure chamber 102 are defined within the second housing 96 by a diaphragm 98. The first chamber 94 and the second chamber 100 are the valve body 1
04, and the flow rate adjustment passage 106 whose opening area changes. That is, the outer surface 1 of the valve body 104 is formed to be inclined in the same direction as the passage wall surface 108 of the flow rate adjustment passage 106 which is formed to be inclined.
10 moves toward and away from the flow rate adjustment passage 106.
The opening area of the opening is changed.

The valve body 104 is connected to the diaphragm 98 via the rod 112.
is supported by

The second chamber 100 communicates with an oxygen outflow passage 118 that communicates with a nozzle 114 having an oxygen outflow port 116 that communicates with the bench portion 60 . The oxygen outlet 116 of the nozzle 114 is oriented in the air flow direction and has an oblique surface.

Further, in the pressure chamber 102, a spring 120 is provided between the second housing 96 and the diaphragm 98.

One end side of a pressure guiding passage 122 communicates with the pressure chamber 102 . Pressure intake port 1 on the other end side of this pressure guiding passage 122
24 communicates with the body intake passage 12 on the downstream side of the intake throttle valve 14.

That is, in the oxygen supply means 74, as shown in FIG. 2, when the load acting on the pressure chamber 102 of the oxygen amount control valve mechanism 90, that is, the intake pipe pressure (negative pressure) reaches the predetermined value N,
When a negative pressure weaker than this predetermined value N and up to atmospheric pressure (zero) (shown by the shaded area in FIG. 3) is acting on the pressure chamber 102, the diaphragm 9
8 is displaced, and therefore the valve body 104 is connected to the flow rate adjustment passage 106.
Since it opens and closes, oxygen flows from the first chamber 94 to the second chamber 100.
and from the oxygen outlet 116 to the bench area 60.
It is supplied to The main proportional control valve 64, auxiliary fuel valve 68, etc. are computer-controlled by a control section (not shown).

Next, the operation of this first embodiment will be explained.

Oxidized LNG, which is the fuel in the fuel tank 36, is guided to the first fuel supply passage 42, passes through the first fuel cutoff valve 38 and the fuel filter 40, and reaches the fuel heat exchange section 48 in the heat exchange chamber 46, where this fuel When air comes into contact with the heat exchange section 48, it is vaporized.

Then, the vaporized fuel is led to the second fuel supply passage 52, regulated by the fuel regulator 50, and then from the main branch passage 54 to the second fuel cutoff valve 62, the main proportional control valve 64, and from the main stream outlet 58 to the body. It is mixed with the air in the intake passage 12.

By the way, when the load reaches a predetermined value when a vehicle equipped with the engine 2 is running uphill or at high speed, that is, when the intake throttle valve 14 opens in the range from the A position to the fully open position, the downstream side of the intake throttle valve 14 opens. When the negative pressure in the intake pipe becomes weaker than the predetermined value N (see Fig. 2), the negative pressure in the intake pipe acting on the pressure chamber 102 from the pressure passage 122 also becomes weak.
Since the spring 120 presses and displaces the diaphragm 98 in the direction of contraction of the second chamber 100, the valve body 104 opens the flow rate adjustment passage 106.

As a result, oxygen is guided from the liquefied oxygen cylinder 76 to the first oxygen supply passage 82, passes through the oxygen cutoff valve 78 and the oxygen filter 80, is further vaporized in the oxygen heat exchange section 84, and is introduced through the second oxygen supply passage 88. The oxygen that has reached the regulator 86 and the first chamber 94 passes through the flow 1iJ conditioning passage 106 and reaches the second chamber 100, and then passes through the oxygen outlet passage 118 and the nozzle 114 from the oxygen outlet 116 to the venturi section 60 through the intake pipe. Supplied depending on the strength of negative pressure.

At this time, the computer-controlled auxiliary fuel valve 68
is controlled according to the operation of the oxygen amount control valve mechanism 90,
Since the amount of fuel corresponding to the increased amount of oxygen from the nozzle 114 is guided to the sub-branch passage 56 and supplied into the body intake passage 12, the air-fuel ratio can be maintained appropriately.

As a result, when the intake pipe negative pressure becomes weaker than the predetermined value N and the output of the engine 2 is about to decrease, oxygen enrichment can be performed to improve the output of the engine 2. It is possible to stabilize the vehicle's uphill running and high-speed running even when the vehicle is on the road.

Further, according to this embodiment, since it is only necessary to provide the oxygen supply means 74 to the existing engine structure, it is easy to install even in general vehicles, and the manufacturing cost is low, and the overall temperature is low. can do.

Furthermore, since the nozzle 114 is disposed facing the venturi section 60, it is possible to increase the amount of oxygen supplied in accordance with the flow rate of air in the venturi section 60, which is advantageous in practice.

FIG. 3 shows a second embodiment of the invention. In the following embodiments, parts having the same functions as those in the above-described embodiments will be described with the same reference numerals.

The feature of this second embodiment is that the oxygen supply means 7
4 is configured as follows. That is, oxygen tank 2
02 (oxygen outlet 2 of the oxygen supply passage 204)
06 is provided in communication with the venturi portion 210 of the vaporizer 20B, and a cutoff valve 212, a solenoid valve 214, and an oxygen regulator 216 are sequentially provided in the oxygen supply passage 204 from the oxygen tank 202 side. This oxygen regulator 216 includes a primary diaphragm 218 that partitions and forms a primary pressure reducing chamber 222 in which a primary pressure reducing valve 220 is provided in a main body 218, a secondary pressure reducing chamber 226 in which a secondary pressure reducing valve 224 is provided, and a fire source pressure chamber 222. and a primary spring 230 that biases this secondary diaphragm 228, a secondary diaphragm 232 that partitions and forms a secondary decompression chamber 226, and a secondary spring 234 that biases this secondary diaphragm 232,
Oxygen from the oxygen tank 202 is depressurized by the fire source pressure chamber 222 and the secondary decompression chamber 226, and the depressurized oxygen is supplied to the venturi section 210.

Also, the carburetor intake passage 23 downstream of the carburetor throttle valve 236
8 is supplied with fuel from a fuel injection valve 240.

According to the configuration of the second embodiment, as shown in FIG. 2 of the first embodiment, when the intake pipe negative pressure becomes weaker than the predetermined value N, oxygen from the oxygen tank 202 is transferred to the oxygen regulator 2.
16, the pressure is reduced to a predetermined pressure by the primary decompression chamber 222 and secondary decompression chamber 226 of the oxygen regulator 216, and this oxygen is supplied from the oxygen outlet 206 to the venturi section 210. Also at this time, the oxygen outlet 206
According to the increase in the amount of oxygen from the fuel injection valve 240, a predetermined amount of fuel is supplied from the fuel injection valve 240, thereby making it possible to keep the air-fuel ratio constant.

As a result, the configuration of the oxygen supply means 74 is simplified, the oxygen supply means 74 can be easily installed, and is practical. Regulator 216 operates,
The supply of oxygen can be adjusted depending on the flow rate of the bench area 210.

It should be noted that this invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made.

For example, in the first embodiment, the displacement of the diaphragm 98 is adjusted by the spring 120, but it is also possible to provide an operating valve that is linked to the negative pressure in the intake pipe and adjust the oxygen lid by the operation of this operating valve. be.

〔Effect of the invention〕

As is clear from the above detailed description, according to the present invention,
By providing an oxygen supply means that supplies oxygen according to the engine load condition when the engine load reaches a predetermined value, the small engine The present invention can prevent the engine output from decreasing even when driving on a hill or at high speed, and can supply oxygen to the engine with a simple configuration.

Further, the oxygen supply means can be installed in a general vehicle without changing the existing fuel supply means, is practical, and has low manufacturing costs, making it possible to reduce the overall cost.

[Brief explanation of the drawing]

1.2 shows a first embodiment of the present invention, FIG. 1 is a schematic diagram of an engine equipped with oxygen supply means, and FIG. 2 is a diagram showing the relationship between an intake throttle valve and negative pressure. FIG. 3 shows a second embodiment of the invention, and is a schematic diagram of an engine equipped with oxygen supply means. In the figure, 2 is the engine, 12 is the body intake passage, and 3 is the engine.
4 is a fuel supply means, 36 is an LNG tank, 44 is a heat exchanger, 60 is a venturi section, 64 is a main proportional control valve, 74 is an oxygen supply means, 84 is an oxygen heat exchange section, 90 is an oxygen amount control valve mechanism, 102 is a pressure chamber, 104 is a valve body, 106 is a flow i
t adjustment passage, and 114 a nozzle.

Claims (1)

[Claims] 1. An oxygen supply engine characterized by being provided with an oxygen supply means that supplies oxygen according to the engine load state when the engine load reaches a predetermined value.