JPS58183854A - Combustion promoting apparatus for engine - Google Patents

Abstract

PURPOSE:To prevent occurrence of vibration due to instable operation of an engine, by attaining stable combustion by supplying oxygen-enriched air to an engine when instable operation of the engine is detected by a roughness sensor. CONSTITUTION:A control unit 26 controls the fuel injection quantity of a fuel injection nozzle 7 and operation of a relief valve 25 and an actuator 22 for controlling the opening of a first control valve 19 and a second control valve 20. A roughness sensor 27 detects instable operation of an engine 1 from vibration, and output signals of the roughness sensor 7 and a temperature sensor are afforded to the control unit 26 together with the output signal of an air-flow meter 5. With such an arrangement, the control unit 26 controls an oxygen- enriched air supplying means 11 to supply oxygen-enriched air to the engine 1 via an oxygen-enriched air supply passage 12 when the engine temperature is low and the engine operation is instable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an Ensif combustion promotion device that supplies oxygen-rich air.

Conventionally, as a device that improves engine combustion performance and improves fuel efficiency, for example, Japanese Patent Application Laid-Open No.
As shown in Japanese Patent Publication No. J, a technology has been proposed for supplying oxygen lynch air with an improved 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 Noricon 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, the so-called oxygen permeable membrane method allows more oxygen to pass through and obtains oxygen-rich air, and the pellet-shaped synthetic Seven Ora! The most commonly known method is the so-called nitrogen adsorption method, in which air is fed under pressure into a container filled with zeolite, a large amount of nitrogen is adsorbed by zeolite, and suspended oxygen is extracted to obtain oxygen-rich air.

On the other hand, in a gasoline engine or a diesel engine, an unstable state may occur in the engine due to various conditions, resulting in problems such as generation of abnormal vibration, reduction in output, and reduction in exhaust purification performance.

In other words, in gasoline engines, for example, misfires in partial cylinders due to wetting the spark plugs or a decrease in combustibility due to differences in air-fuel ratio between cylinders when the engine is cold, and in diesel engines, fuel injection Due to the clogging of the nozzle with carbon, uneven rotation occurs due to the difference in fuel supply between the cylinders, resulting in an unstable engine state, resulting in the above-mentioned problems.

In view of this, the present invention detects an unstable state of the engine using a roughness sensor, and uses an oxygen-rich air supply device that receives the output of the roughness sensor to supply oxygen enriched in the oxygen concentration enrichment device. An object of the present invention is to provide a luensin combustion promotion device that supplies lynch air to an engine, ensures good combustion performance, and improves the unstable state of the engine, and eliminates the adverse effects caused by the occurrence of the unstable state of the engine. It is.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an engine, 2 is an intake passage that supplies air that has passed through an air cleaner 3 to the engine 1, and 4 is an exhaust passage.

In the intake passage 2, 5 is an air 7 for detecting the amount of intake air.
0-meter, 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 fuel injection nozzle that injects fuel downstream of the throttle valve 6. Note that 8 is an intake valve, 9 is an exhaust valve, and 10 is a spark plug.

On the other hand, 11 is an oxygen lynch air supply device that supplies the engine 1 with oxygen-rich air enriched by the oxygen concentration enrichment device @ 16 that increases the oxygen content ratio in the air, and the oxygen concentration enrichment device 16 is Oxygen-rich air supply passage 12
This oxygen-rich air supply passage 72 takes in air from the intake passage 2 downstream of the air cleaner 6 and supplies oxygen-rich air to the intake passage 2 upstream of the air flow meter 5 via the oxygen concentration enrichment device 16. It is connected to the intake passage 2.

The oxygen concentration enrichment device 13 is of an oxygen permeable membrane type in which an oxygen permeable membrane 15 is housed in a case 14 (this is formed, and air is supplied to the outside of the oxygen permeable membrane 15 by a feed pump 16 on the upstream side). The oxygen permeable membrane 1 is pumped by the suction pump 17 on the downstream side.
5 is provided to suck in the oxygen-rich air that has passed through the air flow meter 5 and supply it to the intake passage 2 upstream of the air flow meter 5.

Note that the feed pump 16 and the suction pump 17 are configured to be constantly driven as the engine 1 rotates.

The oxygen-rich air enriched by the oxygen concentration enrichment device 13 is delivered to the engine at a predetermined concentration by the oxygen concentration adjustment device 18.
The oxygen concentration adjustment device 18 is connected to a %/control valve 19 provided in the Ω intake passage 2 upstream from the confluence of the oxygen-rich air supply passages 12, and to the oxygen-rich air supply passage 12 downstream from the suction pump 17. The first control valve 19 and the second control valve 20 are linked by a link mechanism 21, and the seventh control valve 19 and the second control valve 20 are connected by an actuator 22 such as a motor. The oxygen concentration of the intake air supplied to the engine 1 is adjusted by interlockingly opening and closing the two control wells 20 in opposite directions. That is, when increasing the oxygen concentration, the first control valve 19 is closed and the second control valve 20 is opened, while when decreasing the oxygen concentration, the first control valve 19 is closed.
is opened and the second control valve 20 is closed.

In addition, 26 is nitrogen-rich air (
Nitrogen lynch air exhaust passage, which exhausts oxygen-lean air)
24 is the oxygen-rich air supply passage 1 downstream of the suction pump 17
2 and the nitrogen XI)) h air exhaust passage 26.
The IJ-F passage, 25, is the IJ-F passage when oxygen-rich air is supplied.
This is a relief valve that closes the J-F passage 24 and opens the relief passage 24 when no supply is provided.

On the other hand, 26 indicates the amount of fuel injected from the fuel injection nozzle 7, the opening/closing operation of the IJ 17 valve 25, and the first
This is a control device that controls the operation of an actuator 22 that adjusts the opening degrees of the control valve 19 and the second control valve 20. moreover,
27 is a roughness sensor that detects an unstable state of the engine 1 from the vibration of the engine 1, and 28 is a temperature sensor that detects the temperature of the cooling water of the engine 1. The detection signal is also input to the control device 26.

The control device 26 controls the amount of fuel injected from the fuel injection nozzle 7 according to the amount of intake air, and
The oxygen-rich air supply device 11 is controlled to supply oxygen-rich air to the engine 1 from the oxygen-rich air supply passage 12 when the engine is cold or in an unstable state.

FIG. 2 shows an example of the control device @26,
Reference numeral 30 denotes a basic injection amount determination circuit that calculates the fuel injection amount for the intake air amount detected by the air flow meter 5, and its output signal is outputted to the fuel injection nozzle 7 via the fuel injection nozzle drive circuit 31.

On the other hand, 62 is a first determination circuit that compares the detection signal of the temperature sensor 28 with a reference value and determines whether the engine 1 is in a cold state below the set temperature.
The output signal of the discrimination circuit 32 is sent to the actuator 22 and the relief valve 25 via an OR circuit 63 and a drive circuit 64.
is output to supply oxygen lynch air to the engine 1.

Further, 65 is a second discrimination circuit that compares the detection signal of the roughness sensor 27 with a reference value and discriminates whether the engine vibration is in an unstable state exceeding a set level.When an unstable state occurs, the second discrimination circuit 65 The output signal is outputted to the actuator 22 and the relief valve 25 via the OR circuit 63 and the drive circuit 34, and supplies oxygen lynch air to the engine 1.

In the above embodiment, oxygen-rich air is supplied when the engine is cold based on the detection signal of the temperature sensor 28, or the supply of oxygen-rich air improves combustibility and at the same time warms the engine by increasing the combustion temperature. This can reduce machine time.

Further, in the above embodiment, as the oxygen concentration enrichment device 16, in addition to the oxygen permeable membrane method using the oxygen permeable membrane 15, a nitrogen adsorption force 6 type can also be adopted.

Furthermore, the present invention can also be applied to a diesel engine, and supplies oxygen lynch air when the engine is in an unstable state detected by the roughness sensor 27. In this case, the supply of oxygen-rich air increases the combustion temperature, which has the advantage of eliminating clogging by burning and removing carbon.

As explained above, according to Misfire J, the roughness sensor detects the unstable state of the engine and supplies oxygen-rich air to the engine, which improves and stabilizes combustibility and improves engine stability. In addition to preventing the generation of vibrations, reduced output, and deterioration of exhaust purification performance due to the occurrence of unstable conditions in Therefore, it has the advantage that the oxygen concentration enrichment device can be downsized by 4 seconds without impairing the reliability of the engine.

[Brief explanation of drawings]

The drawings illustrate embodiments of the invention, with FIG. 1 being a schematic block diagram and FIG. 2 being a block diagram showing one row of control devices.

Claims (1)

[Claims] (1) An oxygen concentration enrichment device that increases the oxygen content ratio in the air, a roughness sensor that detects an unstable state of the engine, and the oxygen concentration enriched by the oxygen concentration enrichment device based on the output of the roughness sensor. An engine combustion promotion device comprising: an oxygen-rich air supply device that supplies oxygen-rich air to an engine.