JPH03130516A - Oil supply device for two-cycle engine - Google Patents

Abstract

PURPOSE:To eliminate improper lubrication at the time of generating knocking by correction-controlling a delivery amount of an electrostrictive vibrating oil pump, which supplies lubricating oil to an engine, to an increase side in accordance with detection of engine knocking. CONSTITUTION:A delivery port 12 of an electrostrictive vibrating oil pump 11 is connected to an oil delivery nozzle 10 arranged in an intake pipe 7 of an engine E. While the oil pump 11, in which its electrostrictive vibrator 19 is vibrated by a pulse signal from an oscillating circuit 24 thus to reciprocate a diaphragm 18 with the volume of a pump chamber 17 changed, performs delivery action. Further the oscillating circuit 24 is drive-controlled by a driving circuit 26 of a control means 25 being based on a detection v from a CDI system ignition device 29. Here a detection signal from a knocking detecting circuit 33 is input to the driving circuit 26 through a correcting circuit 27. A delivery amount of the oil pump 11 is correction-controlled to an increase side in accordance with detection of knocking.

Description

DETAILED DESCRIPTION OF THE INVENTION A8 Object of the Invention (1) Field of Industrial Application The present invention relates to an oil supply device for a two-stroke engine.

(2) Prior Art Conventionally, an oil supply device for a two-stroke engine is known, for example, from Japanese Patent Application Laid-Open No. 62-78482.

(3) Problems to be Solved by the Invention In the conventional system described above, lubricating oil is supplied to a two-stroke engine by an electrically operated oil pump, and the amount of operation of the electrically operated oil pump is controlled by the number of engine revolutions. I am trying to make it simply proportional to.

However, when knocking occurs in a two-stroke engine, a rapid temperature rise occurs in the engine body and the required oil amount increases, but the above-mentioned conventional engine cannot meet this demand.

The present invention has been made in view of such circumstances, and has two
An object of the present invention is to provide an oil supply device for a two-stroke engine that can increase the amount of oil supplied when knocking occurs in the cycle engine, thereby avoiding poor lubrication during non-king.

B1 Structure of the Invention (1) Means for Solving the Problem The device of the present invention includes an electrically operated oil pump for supplying lubricating oil to a two-stroke engine, a knocking detector for detecting knocking in the two-stroke engine, and control means for correcting the discharge amount of the oil pump to an increased amount in response to knocking detected by the knocking detector.

(2) Effects According to the above configuration, when knocking occurs in the two-stroke engine, the control means corrects the discharge amount of the electrically operated oil pump to the increasing side, thereby making it possible to provide sufficient lubrication at the time of knocking.

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

Moreover, a closed valve 8 is disposed in the intake port 6. Further, an exhaust port 9 is provided on the side of the cylinder block 2.

An oil discharge nozzle 1o is disposed in the middle of the intake pipe 7, and a discharge port 12 of an electrostrictive vibrator type oil pump 11 as an electrically operated oil pump 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 I5,
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 16 that biases the diaphragm I8 toward the pump chamber 17. Spring 2 stored inside
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 21 is interposed between the spring 20 and the casing 15.

Also, between the pump chamber 17 and the discharge port 12, the casing 15
A discharge valve 22 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 23 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 24 is connected to the electrostrictive vibrator 19, and the electrostrictive vibrator 19 is activated by a pulse signal from the oscillation circuit 24.
vibrates, causing the diaphragm 18 to repeat a state in which it bends toward the pump chamber 17 and a state in which it deflects toward the spring chamber 16. As a result, the volume of the pump chamber 17 increases and decreases, and the electrostrictive vibrator oil pump 11 operates to discharge oil. do.

The operating amount of the electrostrictive vibrator oil pump 11 is controlled by a control means 25 configured by a microcomputer, and this control means 25 includes a drive circuit 26 that drives an oscillation circuit 24 and a The drive circuit 26 includes a correction circuit 27 that corrects the drive signal from the
A signal corresponding to the ignition timing of the spark plug 30 is input from the CD1 type ignition device 29 connected to the ACG 28 . That is, a drive signal basically corresponding to the ignition timing of the spark plug 30, that is, the engine rotational speed is inputted from the drive circuit 26 to the oscillation circuit 24.

A knocking detector 31 for detecting knocking of the two-stroke engine E is connected to the correction circuit 27. This knocking detector 31 includes a knocking sensor 32 that is attached to the crankcase l and detects vibrations of the crankcase 1, and a determination circuit 33 that determines the knocking intensity according to the value detected by the knocking sensor 32.
The output signal of the judgment circuit 33 is input to the correction circuit 27.

The correction circuit 26 adjusts the drive circuit 26 when the knocking detector 31 detects a knocking state.
Input the correction signal to. That is, the drive circuit 26 sends to the oscillation circuit 24 a drive signal that operates the electrostrictive resonator oil pump 11 with the discharge characteristics shown by the curve in FIG. However, when knocking is detected by the knocking detector 31 as shown by curve B in FIG.
A drive signal for correcting the ejection amount of 1 to the increase side is given to the oscillation circuit 24.

In the above correction, at least one of the correction of the number of oscillations of the oscillation circuit 24 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.

Next, to explain the operation of this embodiment, the electrostrictive resonator oil pump 11 basically supplies lubricating oil to a two-stroke engine with discharge characteristics as shown by the curve in FIG.
However, when knocking occurs, the oil supply amount is changed to increase as shown by curve B in FIG.

Therefore, a sufficient amount of lubricating oil can be supplied to the two-stroke engine E in response to the sudden temperature rise in the two-stroke engine E caused by knocking.
It is possible to prevent poor lubrication from occurring.

Note that if the electrostrictive resonator oil pump 11 is used as the electrically actuated oil pump for supplying lubricating oil, power consumption can be reduced. Since the discharge amount of the oil pump 11 is relatively small, the operation of the electrostrictive resonator oil pump 11 can be made to follow sudden changes in the operating condition of the two-stroke engine E, making it possible to finely adjust the oil discharge amount. ,
More precise control of oil supply becomes possible.

C1 Effects of the Invention As described above, the device of the present invention includes an electrically operated oil pump for supplying lubricating oil to a two-stroke engine;
The apparatus includes a knocking detector that detects knocking in a cycle engine, and a control means that corrects the discharge amount of the oil pump to an increased amount in response to the knocking detected by the knocking detector, so that when knocking occurs, a sufficient amount is provided. This makes it possible to supply lubricating oil and avoid poor lubrication when knocking occurs.

[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 electrically operated oil pump. 11... Electrostrictive resonator oil pump as an electrically actuated oil pump, 25... Control means, 1... Knocking detector, E... Two-stroke engine patent applicant Honda Motor Co., Ltd. representative Hitoshi Roshi Ochimu Kendo Niki Akira Figure 2 Engine rotation speed

Claims (1)

[Claims] An electrically operated oil pump (11) for supplying lubricating oil to the two-stroke engine (E), and a knocking detector (11) for detecting knocking in the two-stroke engine (E).
31) and a control means (25) for correcting the discharge amount of the oil pump (11) to an increased amount in response to knocking detected by the knocking detector (31). Feeding device.