JPH03130587A - Operation failure detecting device for electrostrictive vibrator type oil pump - Google Patents

Abstract

PURPOSE:To detect failure of an operating condition easily by providing an electrostrictive vibrator at a diaphragm with a peripheral part supported by a casing for forming a pump chamber and installing a distortion gauge at the diaphragm or electrostrictive vibrator. CONSTITUTION:A diaphragm 18 is provided on the inner side of a casing 15 with a peripheral part supported form forming a pump chamber 17 and a spring chamber 16. The electrostrictive vibrator 19 is provided at the diaphragm 18, and a distortion gauge 35 is installed at the electrostrictive vibrator 19 or the diaphragm 18 (illustration shows a case of installation at the electrostrictive vibrator). The electrostrictive vibrator 29 is energized by an output of an oscillation circuit 23 to vibrate the diaphragm 18 in the direction of an arrow A for increasing and decreasing the volume of the pump chamber 17 and sucking lubricating oil 14 from a suction port 13 while it is supplied from a discharge port 12 to a discharge nozzle 10 of a two-cycle engine E, for example. For an abnormal stoppage of action of a pump 11, the output of the distortion gauge 35 becomes zero, which is inputted through a distortion detecting circuit 36 to a CPU 29 for alarming 37. An operation failure can thus be detected securely.

Description

Detailed Description of the Invention A1 Object of the Invention (1) Industrial Application Field The present invention relates to a diaphragm whose peripheral edge is supported by a casing and which is disposed facing a pump chamber formed within the casing. The present invention relates to a malfunction detection device for an electrostrictive vibrator type oil pump equipped with an electrostrictive vibrator.

(2) Prior Art Conventionally, such an electrostrictive vibrator type oil pump has been disclosed, for example, in Japanese Patent Application Laid-Open No. 1983-1983! It is publicly known from Publication No. 08 and the like.

(3) Problems to be Solved by the Invention Incidentally, such electrostrictive resonator oil pumps may malfunction due to disconnection of the power supply line, etc., and are used, for example, for supplying lubricating oil to two-stroke engines. In such a case, unless it is possible to immediately detect the occurrence of a malfunction, the supply of lubricating oil to the two-stroke engine will become unstable.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a malfunction detection device for an electrostrictive vibrator oil pump that can easily detect malfunction.

B0 Structure of the Invention (1) Means for Solving the Problems According to the present invention, a strain gauge for detecting strain is attached to one of the diaphragm and the electrostrictive vibrator, and the strain gauge operates according to the strain value detected by the strain gauge. A determining means for determining the condition is connected to the strain gauge.

(2) Effect According to the above configuration, when the diaphragm or the electrostrictive vibrator stops operating and malfunction of the electrostrictive vibrator type oil pump occurs, the amount of strain detected by the strain gauge becomes zero. It is detected that a malfunction has occurred.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings. First, in FIG. 1, the engine body of a two-stroke engine E includes a crankcase 1 having a crank chamber 1a, and a cylinder having a cylinder hole 2a. A block 2 and a cylinder head 3 are connected in this order. A piston 4 is slidably fitted into the cylinder hole 2a, and a combustion chamber 5 is formed between the piston 4 and the cylinder head 3.

An intake boat 6 is provided on the side of the crankcase 1.
An intake pipe 7 is connected to the intake boat 6.

Furthermore, a board valve 8 is provided on the intake boat 6. Further, an exhaust boat 9 is disposed on the side of the cylinder block 2.

An oil discharge nozzle lO is disposed in the middle of the intake pipe 7, and a discharge port 12 of an electrostrictive vibrator oil pump 11 is connected to this oil discharge nozzle 10. Further, a reservoir 14 for storing lubricating oil is connected to the suction port 13 of the electrostrictive vibrator type oil pump 11.

The electrostrictive resonator oil pump 11 includes a casing 15,
A diaphragm 18 that divides the inside of the casing 15 into a spring chamber 16 and a pump chamber 17, an electrostrictive vibrator 19 attached to the diaphragm 18, and a spring chamber 1 that biases the diaphragm 18 toward the pump chamber 17. Spring 2 stored within the day
o. Therefore, the diaphragm 18 is
The periphery of the spring 20 is sandwiched between the casing 15 in an insulated state, and a conductive material 4° is interposed between the spring 20 and the casing 15.

In addition, the casing 15 is located between the pump chamber 17 and the discharge port 12.
A discharge valve 21 that allows only the flow of lubricating oil from the pump chamber 17 to the discharge port 12 is disposed in the pump chamber 17.
A suction valve 22 is provided in the casing 15 between the suction port 13 and the suction port 13 to allow only the flow of lubricating oil from the suction port 13 to the pump chamber 17 .

An oscillation circuit 23 is connected to the electrostrictive vibrator 19, and the electrostrictive vibrator 19 is activated by a pulse signal from the oscillation circuit 23.
vibrates, and the diaphragm 18 repeats a state in which it is bent toward the pump chamber 17 (llJ) and a state in which it is deflected toward the spring chamber 16. As a result, the volume of the pump chamber 17 increases and decreases, and the electrostrictive vibrator type oil pump 11 discharges. Operate.

The oscillation circuit 23 is driven by a drive circuit 25, and a signal corresponding to the ignition timing of the spark plug 28 is inputted to the drive circuit 25 from a CDI ignition device 27 connected to the ACG 26.

That is, for basic fishing, a drive signal corresponding to the ignition timing of the spark plug 28, that is, the engine rotation speed is inputted from the drive circuit 25 to the oscillation circuit 23.

On the other hand, a control signal is input to the drive circuit 25 from a central processing circuit 29 consisting of a microcomputer, and the drive signal from the drive circuit 25 to the oscillation circuit 23 is corrected by the control signal.

A rotation speed detector 3o that detects the rotation speed of the two-stroke engine E is connected to the central processing circuit 29. This rotation speed detector 30 has a plurality of pawls 31a arranged at equal intervals in the circumferential direction, and includes a rotor 31 that rotates in synchronization with the rotation of a crankshaft 32 in a two-stroke engine, and a magnetic pickup 33 that detects the pawls 31a. and an engine rotation speed detection circuit 34 that outputs the engine rotation speed according to the rotation angle position signal of the crankshaft 32 inputted from the magnetic pickup 33.
The output signal of the engine rotation speed detection circuit 34 is input to the central processing circuit 29.

The central processing circuit 29 then inputs a correction signal to the drive circuit 25 in accordance with the value detected by the rotation speed detector 30. That is, the drive circuit 25 generates a drive signal that makes the discharge amount of the electrostrictive resonator oil pump 11 proportional to the engine speed, as shown by straight line A in FIG. The correction signal from the central processing circuit 29 is applied to the oscillation circuit 23, and as shown by curve B in FIG. The oscillation circuit 23 is supplied with a drive signal that is corrected to make the discharge amount small and increase the ejection amount in the high rotation range.

In the above correction, at least one of the correction of the number of oscillations of the oscillation circuit 23 and the correction of the drive voltage may be performed, and when both corrections are performed, priority is given to correction of the number of oscillations.

Further, in the electrostrictive vibrator type oil pump 11 , a strain gauge 35 is attached to the electrostrictive vibrator 19 , and this strain gauge 35 is connected to a strain detection circuit 36 . Furthermore, the strain detection circuit 36 is connected to a central processing circuit 29 serving as a determining means, and the central processing circuit 29 controls the electrostrictive resonator oil pump 1 when the strain pressure detected by the strain detection circuit 3B becomes zero.
1 is malfunctioning, an alarm device 37 such as an alarm lamp or an alarm buzzer is activated.

Next, to explain the operation of this embodiment, the electrostrictive resonator oil pump 11 basically operates in accordance with the engine speed to supply lubricating oil to the two-stroke engine E. The oil supply amount is changed as shown by curve B in FIG. 2 according to the engine speed. Therefore, when the engine speed is low, the amount of lubricating oil supplied may be excessive, resulting in oil dripping from the exhaust pipe or white smoke, or when the engine speed is high, the amount of lubricating oil supplied may be insufficient. This makes it possible to supply lubricating oil in just the right amount depending on the engine speed.

Further, by using the electrostrictive vibrator type oil pump 11 as a pump for supplying lubricating oil, it is possible to finely adjust the oil discharge amount, and more precise oil supply amount control is possible.

Furthermore, if the electrostrictive resonator oil pump 11 malfunctions due to a disconnection of its power supply line, etc., the strain detected by the strain gauge 35 becomes zero, and the alarm 37 is activated accordingly to issue an alarm. It is possible to immediately know that a malfunction has occurred in the operation of the strain oscillator oil pump 11, and it is possible to prevent the two-stroke engine E from continuing to operate with the electrostriction oscillator oil pump 11 malfunctioning. .

In the above embodiment, the strain gauge 35 is attached to the electrostrictive vibrator 19, but the strain gauge 35 may be attached to the diaphragm 18.

C9 Effects of the Invention As described above, according to the present invention, a strain gauge for detecting strain is attached to one of the diaphragm and the electrostrictive vibrator, and the determining means determines the operating state according to the strain value detected by the strain gauge. Since the strain gauge is connected to the strain gauge, it is possible to easily and reliably detect malfunction of the oil pump in accordance with the fact that the amount of detected strain becomes zero at the time of malfunction.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram showing the overall configuration, and FIG. 2 is a discharge characteristic diagram of an electrostrictive vibrator type oil pump. DESCRIPTION OF SYMBOLS 11... Electrostrictive vibrator type oil pump, 15... Casing, 17... Pump chamber, 18... Diaphragm, 19... Electrostrictive vibrator, 29... Central processing as judgment means Circuit, 35... Strain gauge, E... 2-cycle engine Honda Motor Co., Ltd. Kenhito Ochiai Wood - Akira

Claims (1)

[Claims] An electrostrictive vibrator (1) is mounted on a diaphragm (18) whose peripheral edge is supported by the casing (15) and is arranged facing the pump chamber (17) formed within the casing (15).
9), a strain gauge (35) for detecting strain is attached to one of the diaphragm (18) and the electrostrictive vibrator (19). A determining means (29) for determining the operating state according to the strain detected by the gauge (35) is connected to the strain gauge (35).
5) A malfunction detection device for an electrostrictive vibrator oil pump, characterized in that it is connected to.