JPS58155262A - Combustion acceleration device of engine - Google Patents

Abstract

PURPOSE:To require no discharge pump of nitrogen rich air by connecting an discharge passage exhausting the nitrogen rich air of an oxygen density enriching device to a discharge gas passage through a reed valve so as to absorb the nitrogen rich air by use of the pulsating discharge gas. CONSTITUTION:An oxygen density enriching device 12 made by containing an oxygen transparent membrane 14 in a case 13 introduces the air through an air introduction passage 15 branched from an intake air passage 2 downstream an air cleaner 3, and the oxygen rich air transmitted through the oxygen transparent membrane 14 is adequately fed into the intake air passage 2 from a feed passage 16 through a suction pump 18 and a control valve 21. In addition, the nitrogen rich air not transmitted through the transparent membrane 14 is introduced to a discharge passage 17, which is connected to a discharge gas passage 4 through a reed valve 24 so that the nitrogen rich air can be exhausted to the discharge gas passage 4 by utilizing the pulsating discharge gas. The discharge passage 14 is connected to the feed passage 16 downstream the pump 18 through 2 relief passage 25 provided with a relief valve 26.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion promotion device for an engine that supplies oxygen-rich air. As shown in Japanese Patent No. J Otsu-60263, a technique has been proposed for supplying oxygen-rich air with an increased oxygen content ratio to an engine.

As an oxygen concentration enrichment device to obtain the above oxygen-rich air,
Using an oxygen permeable membrane made of multiple layers of silicone thread rubber membranes as described in the previous example, air is sent from one side of the oxygen permeable membrane and sucked from the other side, and the dissolution rate of oxygen and nitrogen is determined by the pressure difference. Due to the difference, there is a so-called oxygen permeable membrane method that allows a large amount of oxygen to pass through to create oxygen-rich air, and a method that pressurizes air and sends it into a container filled with pellet-shaped synthetic zeolite, which causes the zeolite to adsorb a large amount of nitrogen and remove suspended oxygen. The so-called nitrogen adsorption method, which extracts oxygen-rich air to obtain oxygen-rich air, is mainly known.

However, the above oxygen concentration enrichment device is either equipped with a pump for pumping or suctioning air, or there is a loss of engine output to drive this pump, especially when the engine is under low load. In this region, the ratio of pump drive loss increases due to the low engine output, which has the disadvantage of reducing the effect of improving fuel efficiency by supplying the above-mentioned oxygen IJ and air.

In view of this, the present invention provides an oxygen concentration enrichment device that increases the oxygen content ratio in the air, and an oxygen rich '+' enriched by the oxygen concentration enrichment device! an oxygen-rich air supply passage for supplying air to the engine, and a nitrogen-rich air exhaust passage for discharging the nitrogen-rich air from the oxygen concentration enrichment device W, and the nitrogen-rich air exhaust passage is connected to an exhaust passage via a reed valve. The present invention provides a combustion accelerating device for an engine which is connected to the engine and sucks nitrogen-rich air using exhaust pulsation, thereby reducing drive loss of the pump and improving fuel efficiency.

Hereinafter, embodiments of the Kinei Rij will be described with reference to the drawings.

In the first cause, 1 is the engine, 2 is the air cleaner f 6
wo B f:: Intake passage that supplies air to engine 1, 4
is a 4iF air passage 0 In the intake passage 21, 5 is an air flow meter that detects the amount of intake air, 6 is a throttle valve that is disposed downstream of the air flow meter 5 and opens and closes in response to accelerator operation, and 7 is a throttle valve. This is a fuel injection nozzle that injects fuel downstream of 6. Note that 9 is an intake valve, 10 is an exhaust valve, and 11 is a spark plaque.

On the other hand, 12 is an oxygen concentration enrichment device that includes an oxygen permeable membrane 14 in a case 16 and increases the oxygen content ratio in the air; 15
16 is an air introduction passage that takes air from the intake passage 2 downstream of the air cleaner 6 into the oxygen concentration enrichment device 12; The air supply passage 17 is a nitrogen-rich air discharge passage that discharges nitrogen-rich air that does not pass through the oxygen permeable membrane 14 of the oxygen concentration enrichment device 12.

The downstream end of the oxygen-rich air supply passage 16 is connected to the intake passage 2 upstream of the air flow meter 5 through a suction pump 18 that suctions the oxygen-rich air that has permeated inward through the oxygen permeable membrane 14, and is connected to the intake passage 2 upstream of the air flow meter 5. Supply oxygen-rich air. Note that the suction pump 18 is configured to be constantly driven as the engine 1 rotates.

The oxygen-rich air enriched by the oxygen concentration enrichment device 12 is adjusted to a predetermined concentration by the oxygen concentration A adjustment device 19.
The oxygen concentration adjusting device 19 is connected to a first control valve 20 provided in the intake passage 2 upstream of the confluence of the oxygen-rich air supply passages 16 and to the oxygen-rich air supply passage 16 downstream of the suction pump 18. The first control valve 20 and the second control valve 21 are linked by a link mechanism 22, and the first control valve 20 and the second control valve 21 are connected by the operation of a motor 23. The oxygen concentration II of the intake air supplied to the engine 1 is adjusted by interlockingly opening and closing the valve 21 in opposite directions. That is, when increasing the oxygen concentration, the first control valve 20 is closed and the second control valve 21 is opened, while when decreasing the oxygen concentration, the first control valve 20 is opened and the second control valve 21 is opened.
This closes the control valve 21.

On the other hand, the nitrogen IJ notch air exhaust passage 17 has one end connected to the oxygen permeable membrane 1 in the case 16 of the oxygen concentration enrichment device 12.
4, and the other end communicates with the exhaust passage 4, and a bridge valve 24 is interposed in the middle of the nitrogen-rich air exhaust passage 17, and the exhaust pulsation generated in the exhaust passage 4 allows oxygen to permeate. Nitrogen-rich air (oxygen-lean air) outside the membrane 14
The air in the intake passage 2 is introduced from the air introduction passage 15 into the case 13 of the oxygen enrichment device 'at 12.

In addition, 25 is a relief passage that communicates the oxygen-rich air supply passage 16 downstream of the suction pump 18 and the nitrogen-rich air discharge passage 17, and 26 is a relief passage that connects the IJ I when oxygen-rich air is supplied.
27 is a relief valve that closes the J-7 passage 25 and opens the relief passage 25 when no fuel is supplied. Also, 27 controls the amount of fuel injected from the fuel injection nozzle 7, the opening/closing operation of the IJ-f valve 26, and the first This is a control device that controls the operation of a motor 26 that adjusts the opening degrees of the control valve 20 and the second control valve 21.

Specifically, 28 is a load sensor that detects the load from the opening degree of the throttle valve 6, and 29 is an oxygen concentration sensor that is disposed in the intake passage 2 upstream of the air flow meter 5 and detects the oxygen concentration in the intake air. The detection signals of both sensors 28 and 29 are input to the control device 27 together with the detection signals of the air meter 5.

The control device 27 controls fuel injection from the fuel injection nozzle 7 according to the amount of intake air, and
According to the load condition of the engine 1, oxygen-rich air is supplied from the oxygen-rich air supply passage 16 at low to medium loads to promote combustion, and furthermore, the oxygen concentration of the oxygen-rich air supplied to the engine 1 at low to medium loads is adjusted to a set value. When the oxygen concentration exceeds the oxygen concentration, the oxygen concentration is controlled to be reduced to suppress an abnormal rise in combustion temperature.

FIG. 2 shows an example of the control device H27, in which 30 is a basic injection fine-determination circuit that calculates the fuel injection amount with respect to the intake air amount detected by the air flow meter 5;
The output fd is outputted to the fuel injection nozzle 7 via the fuel injection nozzle drive circuit 61.

On the other hand, 62 is a determination circuit that compares the detection signal of the load sensor 28 with a reference value and determines whether the engine load is in a low-medium load state.At low-medium load, the output signal of the determination circuit 62 is +717, which drives the valve. Relief valve 26 via circuit 66
is output to close the relief valve 26, and
The output signal of the discrimination circuit 32 is output to the motor 26 via the motor drive circuit 34 and the correction circuit 35.
The first control valve 20 is closed and the second control valve 21 is opened.

Furthermore, 66 is a comparison circuit that compares the detection signal of the oxygen concentration sensor 29 with a reference value, and outputs a correction signal to the correction circuit 65 when the actual oxygen concentration is higher than the reference value. When this correction circuit 65 receives the signal from the comparison circuit 66, it corrects the control signal of the motor drive circuit 64 to increase the opening degree of the first control valve 20 and decrease the opening degree of the second control valve 21. , the oxygen concentration of the oxygen-rich air supplied to the engine 11 is reduced.

In the above embodiment, the suction pump 18 is provided in a constantly driven manner, but the suction pump 18 is configured with an electric pump and the suction pump is controlled instead of controlling the relief valve 26. Good too. Furthermore, instead of using the first control valve 20 and the second control valve 21, the oxygen-rich air supply passage 16 and the intake passage 2 are switched, and dilution air is supplied to the oxygen-rich air supply passage 16. The oxygen concentration of the oxygen-rich air may be controlled by

Next, FIG. 3 shows a nitrogen adsorption type oxygen concentration enrichment device 67.
In this example, 68 and 69 are the first, second and second reactors filled with pelleted synthetic zeolite 40;
And the second container 38, 39 has a feed pump 4 on the upstream side.
1 is connected to the oxygen-rich air supply passage 16 and the nitrogen-rich air discharge passage 17 on the downstream side, and both containers 38 and 39 are arranged in parallel with each other, and the valley passages 15 and 16 .17 is provided with valves 1 to v6 for switching between the first container 68 and the second container 69.

The air introduction passage 15 pressurizes the air in the intake passage 2 with the feed pump 41 to form the first container 68 or the second container 6.
The Sochi air supply passage 16 delivers oxygen-rich air enriched with nitrogen adsorbed to the synthetic zeolite 40, and as in the previous example, the air flow meter 5
The air is supplied to the engine 1 from the intake passage 2 upstream of the air.

Further, the nitrogen-rich air exhaust passage 17 is connected to the exhaust passage 4 via a reed valve 24, and is connected to the first valve 68 or the second valve 68.
The nitrogen-rich air that has released the nitrogen adsorbed on the synthetic zeolite 40 of the valley device 69 is discharged using the exhaust pulsation generated in the exhaust passage 4, thereby restoring the nitrogen adsorption performance of the synthetic zeolite 40. It is.

On the other hand, regarding the timing of supplying oxygen-rich air, in the above embodiment, it is supplied when the engine 1 is under low to medium load to promote combustion. Oxygen-rich air may also be supplied at times.

As explained above, according to the present invention, the nitrogen rich '9. The nitrogen-rich air exhaust passage that discharges air is connected to the exhaust passage via a reed valve, and the exhaust pulsation generated in the exhaust passage is used to draw in the nitrogen-rich air. Nitrogen-rich air can be discharged without the need for a special pump, and the fuel efficiency improvement effect due to the acceleration of combustion by supplying oxygen-rich air can be fully demonstrated, especially at low load with low engine output. It is possible.

[Brief explanation of the drawing]

The drawings illustrate the implementation of the misfire 1#], with Fig. 1 being a schematic configuration diagram, Figs. 2 and 2 being a block diagram showing an example of a control device, and Fig. 3 showing a modification of the oxygen concentration enrichment device FIG. 1...Engine, 2...Intake passage, 4.
...Exhaust passage, 12.37...Oxygen concentration enrichment device, 14...Oxygen permeable membrane, 15...Air introduction passage, 16...Oxygen-rich air supply passage, 1
7...Nitrogen-rich air discharge passage, 24...Reed valve, 27...Control device, 38.39...
・Answer, 40...Synthetic zeolite ○ 348-

Claims (1)

[Claims] (1) An oxygen concentration enrichment device that increases the oxygen content ratio in the air; an oxygen IJ air supply passageway that supplies the oxygen-rich air enriched by the oxygen concentration device to the engine; The nitrogen rich air exhaust passage is connected to the exhaust passage via a reed valve, and the nitrogen rich air is sucked using the exhaust pulsation. An engine combustion accelerator characterized by: