JPS6017925B2 - Engine oil pump abnormality detection device - Google Patents

Abstract

PURPOSE:To provide a light, compact and cheap detector which can detect the abnormality of an engine oil pump accurately and quickly, by photoelectrically detecting the forced supply state of engine oil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting an abnormality in an engine oil pump of a two-stroke engine.

A two-stroke gasoline engine that mixes gasoline and oil and supplies the mixture to the engine using a separate lubrication system will seize immediately if the engine oil supply is cut off due to a failure in the oil supply V-supply system or the like.

For this reason, always check the oil supply status, and if
If the oil supply stops, immediately (within 2 to 3 seconds)
It is necessary to stop the engine. However, when supplying oil to a two-stroke gasoline engine, the overflow ratio of gasoline and oil is 25:1 or 30:
The ratio is 1st grade, and the amount of oil supplied is very small.

Particularly in small engines, the oil supply flow rate is extremely low, and the oil discharge pressure is also extremely low. By the way, in the case of an 800cc class two-stroke gasoline engine, the oil supply flow rate per cylinder is approximately 13 to 133cc from idling to full throttle.
/h, and the discharge pressure of this oil is approximately 0.2
The pressure is very low at ~0.1k9/earth. For this reason, an inexpensive detector that operates sensitively to such a small amount of low-pressure oil, can accurately detect the flow of oil, and is inexpensive has not yet been proposed. The present invention has been newly developed in view of the above-mentioned points, and focuses on the fact that engine oil is supplied periodically according to the operating cycle of the engine oil feed pump. The present invention provides an abnormality detection device for an engine oil pump.

Hereinafter, the present invention will be described in detail with reference to one embodiment of the accompanying drawings.

In FIG. 1, a cylinder 1 has a substantially cylindrical shape, and lids 2 and 3 are fixed with iron to both closure parts la and lb.

Holes l are provided on the lid body 2 side of the cylinder body 1 and at both diametrical ends.
c and ld are bored facing each other. The cylindrical body 1 is made of a synthetic resin material, such as an acrylic pipe.
Incidentally, the cylinder 1 is not limited to a synthetic resin member, but may also be a pipe made of metal such as aluminum. But that's fine. A connecting portion 2a that protrudes in all directions is formed at the substantially center position on one side of the lid body 2, and a hole 2 that penetrates in the direction of the barrel is formed in the center of this reinforcement portion 2a.
c is drilled. The outer diameter of the end 2b of the connecting part 2a is slightly thicker so that it will not easily come off when the connecting part 2a is inserted into a rubber hose or the like (not shown). The lids 2 and 3 are also formed in the same manner as the lid 2.These lids 2, 3, etc. are also integrally formed of synthetic resin or metal members, etc., like the cylinder 1 described above.Z cylinder 1 Inside, an on-off valve 4 is disposed between the lids 2 and 3 via a spring 5.The on-off valve 4 has a cylindrical shape with a generally convex cross section, and the outer diameter of the front portion 4a is equal to the circle of the cylindrical body 1. The opening/closing valve 4 is made of a light material such as cork.The opening/closing valve 4 is not limited to cork, but may be made of a synthetic resin material with a hollow interior. The spring 5 has one closing side 5a inserted into the rear part 4b of the on-off valve 4, and the other opening side 5b in contact with the inner surface of the lid body 3, so that the on-off valve 4 is always placed on the lid body 2 side. Press 2. And,
Due to the pressing force of the spring 5, the opening/closing valve 4 has a surface 4c in contact with the inner surface 2d of the lid body 2, thereby closing the hole 2c. This on-off valve 4 has a slight differential pressure △P on both sides of the on-off valve 4.
The spring pressure of the two springs 5 is set so as to move in the directions of arrows A and A' at (approximately 0.02 to 0.05 kg/).
A light-emitting element, for example, a light-emitting diode 6, has a light-emitting portion tip connected to the cylindrical body 1.
The hole lc of the cylindrical body 1 is fitted with iron so as to be flush with the inner wall surface of the cylindrical body 1.

It is connected to a predetermined power source (not shown) via connection wires 6a and 6b, and is constantly issued. A light receiving element, such as a phototransistor 7, is fixed with iron in the hole 1d of the lid 1 so that the tip of the light receiving part is flush with the inner wall surface of the cylindrical body 1 and faces the light emitting diode 6.

The detection circuit 10 (fifth
(Figure). In addition, when an acrylic pipe is used as a member of the cylinder 1 as described above, the inner wall surfaces of the mounting holes lc and ld of the light emitting element and light receiving element are painted black to prevent light from propagating inside the acrylic member. This prevents the S/N ratio from decreasing. The connecting portion 2a of the lid 2 is on the inflow side of engine oil, and the connecting portion 3a of the lid 3 is on the outflow side.

In this way, an engine oil pump operation detector (hereinafter simply referred to as a detector) 9 is configured.

It goes without saying that the detector 9 is constructed in an airtight manner. As shown in FIG. 2, this detector 9 is arranged between the oil passage 15 between the oil feed pump 13 and the distributor 14 in the engine oil supply system of the two-stroke gasoline engine 16, and the connecting portion 2a is placed on the oil feed pump 13 side. Connecting part 3 to the pipe 15a of
a to the pipes 15b on the distributor 14 side, respectively. When the engine 16 is stopped, the oil feed pump 13 does not operate, and therefore engine oil is not pumped to the oil passage 15 side.

In this state, oil does not flow into the detector 9 from the connection part 2a of the detector 9, so the on-off valve 4 is pressed by the spring 5 as shown in FIG. The light emitted from the light emitting diode 6 is blocked by the inner surface 2d. Therefore, the photodiode 7 is off, and no signal is output from the detection circuit 10 (FIG. 5). When the engine 16 is driven, the oil feed pump 13 starts operating.

The oil feed pump 13 operates at a predetermined period T in accordance with the rotation of the engine 16 to pump oil. The operating period T of this oil feed pump 13 is, for example, 1.32 during idling.
Sand, it is set at 0.197 seconds at maximum rotation. The operating period T changes between 1.32 and 0.197 seconds depending on the engine rotation. Therefore, the engine oil is pumped in a pulsed manner as shown in FIG. 3 according to the operating period T of the oil pump 13, and flows into the detector 9 from the connecting portion 2a. Then, as shown in FIG. 4, this inflowing oil pushes the on-off valve 4 in the direction of arrow A, flows into the rear of the on-off valve 4 through the gap between this on-off valve 4 and the cylinder body 1, and connects. It flows out from section 3a and flows into distributor 14 via pipe 15b. Distributor 14
is for distributing oil to each cylinder of the engine, and the inflowing oil is sent to the engine 16 via a pipe 17.
A predetermined amount is distributed to each cylinder (not shown). When the on-off valve 4 is pushed in the direction of arrow A as shown in FIG. 4, the light L from the light emitting diode 6 is irradiated onto the phototransistor 7 through the oil.

Therefore, this phototransistor 7 is turned on, and the transistor Tr of the detection circuit 10 shown in FIG. 5 is turned on.
Then, when the operation of the oil pump 13 stops and the flow of oil stops, the on-off valve 4 is moved by the spring 5 as indicated by the arrow A'.
The surface 4c is pressed in the direction shown in FIG. 4, and the surface 4c comes into contact with the lid 2, resulting in the state shown in FIG. Then, the light L from the light emitting diode 6 is blocked again, the phototransistor 7 is turned off, and the transistor Tr is accordingly turned off. The on-off valve 4 thus operates as described above in accordance with the flow of oil in the oil passage 15, that is, the operation of the oil feed pump 13. Therefore, a pulse signal Ps with a period T is output from the output terminal T of the detection circuit 10 in response to the operation of the on-off valve 4. That is, a pulse signal with a period of 1.32 seconds is obtained during idling, and a pulse signal with a period of 0.197 seconds is obtained during maximum rotation. Of course, the period of this output pulse signal varies between 13,200 and 0,190,000 stages depending on the engine rotation. This pulse signal Ps is applied to the waveform shaping circuit 1 as shown in FIG.
8 and subjected to waveform shaping, the signal is applied to a bandpass filter circuit 19. This bandpass filter circuit 1
The width of the band 9 is set to a frequency of 1'1.32 to 1/0.197 cycles depending on the operating period T of the oil pump 13. Therefore, when the oil feed pump 13 is operating normally, the cycle varies from 1.32 to 1.32 depending on the rotation of the engine 16.
0.197 seconds or repetition frequency 1/1.32~1
A pulse signal Ps within the range of /0.197 cycles is output, and this pulse signal Ps is passed through the bandpass filter circuit 1.
9 and a comparator 201 is added. The comparator is used to detect the presence or absence of an input signal.
When the input signal is being applied, a signal 0 is output, and when the input signal is not being applied, a signal 1 is output and applied to the alarm drive circuit 21. When the signal 1 is applied to the drive circuit 21, the drive circuit 21 outputs a drive signal S to light up, for example, an alarm lamp (not shown) of the alarm device 22 or operate a buzzer (not shown). Now, assume that the operating period T of the oil pump 13 has become longer than 1.32 sand for some reason.

The detection circuit 10 detects the operating period T' of the oil pump 13.
A pulse signal P's having a frequency corresponding to the frequency is output. However, this signal P's is filtered by the bandpass filter circuit 1.
9 and no signal is applied to comparator 20. Therefore, the drive circuit 21 outputs the signal S to light the alarm lamp of the alarm device 22 or operate the buzzer. The operator immediately stops the engine 16 upon sensing this alarm. Operation period T of oil feed pump 13
The same applies when the time becomes shorter than 0.197 seconds, contrary to the above case. In this way, an abnormality in the oil feed pump 13 can be immediately detected, and competition in the engine 16 can be prevented. In addition, the drive signal S is applied to, for example, an engine automatic stop function (not shown), so that when the operation of the oil feed pump 13 becomes abnormal as described above, the engine is automatically stopped immediately. You can.

Further, as shown in FIG. 7, a bandpass filter circuit 19
It is also possible to use the integrating circuit 23 instead, and in this case, a simple detection device can be constructed.

Incidentally, new engine oil always flows into the detector 9, so that the loss of light from the light emitting diode 6 due to the oil is small, and the phototransistor 7 can operate satisfactorily. FIG. 8 is a diagram showing another embodiment of the engine oil pump operation detector of the present invention, in which one ends 30a, 31a of optical fibers 30, 31 are fixed with iron to the holes lc, ld of the cylindrical body 1, respectively. A light emitting part 32a of a light emitting element 32 and a light receiving part 33a of a light receiving element 33, with the other ends 30b and 31b disposed outside the overall body 1.
It is connected to.

By adopting such a structure, it is possible to construct an even smaller detector. Furthermore, in this example,
The case where the detector 9 is connected to the oil passage 15 between the oil feed pump 13 and the distributor 14 as shown in FIG. 1 has been described.
The distributor 1 is not limited to this, but as shown in FIG.
4 and the oil tank 11, and the detector 9 may be connected to this oil passage 34.

Furthermore, although this example describes the case in which a set of light emitting and light receiving elements is used, the three color light emitting elements are arranged at 120 degree intervals depending on the color of the oil used (yellow, red, green), etc. , and a light receiving element may be arranged at a position facing each light emitting element.

In this way, by arranging three sets of light emitting and light receiving elements, a versatile detector can be constructed. As described above, according to the present invention, abnormalities in the engine oil pump can be detected accurately and quickly, and engine failures can be prevented.

Furthermore, the structure is very simple, and there are excellent effects such as being able to provide a small, lightweight, and inexpensive detector.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an engine oil pump operation detector according to the present invention, and FIG. 2 is a block diagram showing an embodiment of the sensor according to the present invention used in an engine oil supply system. , Fig. 3 is a diagram schematically showing the oil flow in the engine oil supply system shown in Fig. 2, Fig. 4 is an explanatory diagram of the operation of the detector shown in Fig. 1, and Fig. 5 is an implementation of the detection circuit. FIG. 6 is a block diagram showing an embodiment of the alarm device using the detector of the present invention, FIG. 7 is a block diagram showing another embodiment of the alarm device, and FIG. 8 is a block diagram showing an embodiment of the alarm device using the detector of the present invention. FIG. 9 is a sectional view showing another embodiment of the detector according to the present invention, and FIG. 9 shows another embodiment of the mounting position of the detector according to the present invention to the engine oil supply system. C. is a block diagram. 1... cylinder body, 2, 3... lid body, 4...
...Opening/closing valve, 5...Spring, 6...
・Light-emitting diode, 7...phototransistor,
10...Detection circuit, 13...Oil feed pump, 15, 17, 34...Oil passage, 14...
Distributor, 16... Engine, 30, 31...
...Optical fiber, 32...Light emitting element, 33...
····Light receiving element. Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 Figure 5 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 A device for detecting an abnormality in an oil pump that pumps engine oil intermittently at a period corresponding to the rotational speed of the engine, which has an inlet at one end through which engine oil from the oil pump is introduced, and the other end. a sealed cylindrical body having an outlet for the oil at an end; an on-off valve disposed within the cylindrical body via a spring, one side of which closes the inlet by a spring force and is movable in the axial direction of the cylindrical body; Based on a light-emitting element and a light-receiving element that are arranged opposite to each other so as to sandwich the on-off valve, and the output frequency of the light-receiving element when the on-off valve is reciprocated by engine oil flowing in from the inlet, An abnormality detection device for an engine oil pump, comprising circuit means for detecting an abnormality in the oil pump.