JPH05240016A - Lubricating oil supply device for two-cycle engine - Google Patents

Abstract

PURPOSE:To improve the supply accuracy of lube oil through supplying lube oil by an amount which is precisely required by an engine. CONSTITUTION:A lube oil pump 3 supplies lube oil to a two-cycle engine, while a control unit 6 controls a lube oil supply amount according to an engine operation condition. A supply amount correction means is provided in the control unit 6 which means increases the lube oil supply amount by a set value until a sum of integrated values of a crank shaft rotational number reaches the set value from the time when engine usage is started. The lube oil supply amount is increased compared with that corresponding to the engine operation condition until the running-in is completed. The lube supply amount is thus controlled to be an amount required for operation of the engine over the all area of an engine usage time from the engine usage starting time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a control device for controlling a lubricating oil supply amount to an amount adapted to an engine operating condition.
The present invention relates to a lubricating oil supply device for a cycle engine.

[0002]

2. Description of the Related Art Conventionally, as a device capable of supplying a lubricating oil with a supply amount suitable for an operating state of an engine, a return passage is connected to a lubricating oil supply passage, and the connection portion is provided on either the supply passage side or the return passage. There has been proposed a lubricating oil supply device in which a three-way solenoid valve that closes the other when the other is opened and the duty of this solenoid valve is controlled (for example, see Japanese Patent Laid-Open No. 2-139307).

[0003]

However, even if the duty of the three-way solenoid valve is controlled as described above, the amount of lubricating oil supplied cannot always be the amount required by the engine. This is because the amount of lubricating oil required to operate the engine changes with the aging of the engine itself.

In other words, the required amount of lubricating oil is large at the beginning of use of the engine and decreases as the running-in operation progresses. Therefore, the lubricating oil supply amount is set to the engine operating state detected from the engine speed, throttle opening, etc. There is an excess or deficiency in the amount of lubricating oil just by adjusting.

[0005]

A lubricating oil supply apparatus for a two-cycle engine according to the present invention includes a lubricating oil pump for supplying the lubricating oil to the two-cycle engine, and a lubricating oil supply amount adjusted to an engine operating condition. A control device for controlling is provided, and the control device controls the amount of lubricating oil supplied from the engine operating condition adaptation amount until the total sum of the engine crankshaft rotation speed integrated values from the start of engine use reaches a predetermined value. The lubricating oil supply amount correcting means is provided to increase the amount.

[0006]

[Function] The lubricating oil supply amount is larger than the engine operating condition conforming amount at the beginning of engine use, and decreases as the running-in operation progresses to become the engine operating condition conforming amount. Therefore, from the beginning of engine use to the entire engine operating period. The amount of lubricating oil supplied is controlled to the amount required for operating the engine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic configuration diagram of a lubricating oil supply device for a two-cycle engine according to the present invention, FIG. 2 is a block diagram of a control device used in the lubricating oil supply device for a two-cycle engine according to the present invention, and FIG. 3 is for the present invention. FIG. 4 is a graph showing the relationship between the correction amount and the sum of crankshaft rotational speed integrated values, which is a flowchart showing the operation of the lubricating oil supply apparatus for a two-cycle engine.

In these figures, 1 is 2 according to the present invention.
It is a lubricating oil supply device for a cycle engine. The lubricating oil supply device 1 communicates with a lubricating oil pump 3 driven by a two-cycle engine 2, a three-way solenoid valve 4 connected to the discharge side of the lubricating oil pump 3, and a suction side of the lubricating oil pump 3. And a control unit 6 that controls the duty of the three-way solenoid valve 4.

The lubricating oil pump 3 comprises a plunger pump in which a plunger (not shown) is driven by an engine, and the plunger stroke can be adjusted so that the reciprocating stroke increases as the throttle opening increases. There is.

The three-way solenoid valve 4 has a lubricating oil outlet side communicated with the engine 2 via a lubricating oil supply passage 4a and a lubricating oil tank 5 via a lubricating oil return passage 4b. Both paths 4a by solenoid
4b is switched. Solenoid O
The N and OFF operations are controlled by a control unit 7 described later. When the solenoid is in the ON state, the three-way solenoid valve 4 is switched to the lubricating oil return passage 4b side, and in the OFF state, it is switched to the lubricating oil supply passage 4a side. It is configured.

That is, when the three-way solenoid valve 4 is energized, the lubricating oil is flown into the lubricating oil tank 5, and when the energization is cut off, the lubricating oil is supplied to the engine 2.

The control unit 6 is configured to control the duty of the three-way solenoid valve 4 by energizing or de-energizing the three-way solenoid valve 4 according to a predetermined duty ratio. It should be noted that the duty ratio referred to here is the lubricating oil supply time in the state where the lubricating oil supply passage 4a is switched to,
It is calculated by dividing the lubricating oil supply time by the control cycle including the lubricating oil return time in the state where the lubricating oil return passage 4b is switched. That is, the time when the three-way solenoid valve 4 is OFF (the time when the lubricating oil is supplied to the engine 2) is the OFF time, and the time when the three-way solenoid valve 4 is ON (the lubricating oil is returned to the lubricating oil tank 5). When the time) is the ON time, the duty ratio (%) = [OFF time / (ON time + OFF time)] × 100.

The control unit 6 is connected to a battery 8 via a main switch 7 as shown in FIG. 2, and the ignition device 9 of the engine 2 is used to calculate the rotation speed of the crankshaft 2a of the engine 2. Is connected to the rotational speed calculating means 10 and the throttle opening calculating means 1 which will be described later.
1, a microcomputer 12, a supply amount correction means 13 and the like are incorporated.

The rotation speed calculation means 11 is configured to calculate the crankshaft rotation speed from the ignition signal input from the ignition device 9 and output the crankshaft rotation speed signal to the microcomputer 12. The throttle opening calculation means 11 is configured to calculate the throttle opening from the opening / closing position of the throttle 14 and output a throttle opening signal to the microcomputer 12.

The microcomputer 12 is configured to integrate the crankshaft rotation speeds calculated by the rotation speed calculation means 10 and integrate the values to obtain the total sum of the crankshaft rotation speed integrated values. The crankshaft rotational speed integrated value refers to the number of revolutions of the crankshaft 2a from the time the engine 2 is started to the time it is stopped. The sum of the crankshaft rotational speed integrated values means the time from when the engine is used. Of the crankshaft 2a. The microcomputer 12 is supplied with power from a backup power supply (not shown) when the main switch 7 is turned off,
The structure is such that the data of the total sum of the crankshaft rotational speed integrated values does not disappear.

The microcomputer 12 also stores a duty ratio map (not shown) in which a duty ratio that is the most suitable lubricating oil supply amount for the engine operating condition (hereinafter, this supply amount is referred to as operating condition conforming amount) is recorded. Is equipped with. Then, the microcomputer 12 reads from the duty ratio map the crankshaft rotation speed (engine rotation speed) and the duty ratio corresponding to the throttle opening input from the rotation speed calculating means 10 and the throttle opening calculating means 11. The three-way solenoid valve 4 is duty-controlled in accordance with the duty ratio when the total sum of the crankshaft rotational speed integrated values is equal to or greater than a predetermined numerical value.

The set value for comparing the total sum of the crankshaft rotational speed integrated values is the total rotational speed of the crankshaft when it is considered that the running-in operation of the engine 2 is completed.

The supply amount correcting means 13 calculates the correction amount from the sum of the crankshaft rotational speed integrated values according to a certain function when the sum of the crankshaft rotational speed integrated values obtained by the microcomputer 12 is smaller than the set value. The correction duty ratio is calculated by calculating and adding the correction amount to the duty ratio corresponding to the crankshaft rotation speed and the throttle opening at that time.

The function for calculating the correction amount is shown in FIG.
As shown in, the correction amount ΔN _C gradually decreases as the total sum N _C of the crankshaft rotational speed integrated values increases from the engine use start time N _C0 until the running-in end time N _C1 is reached. ..

That is, when the total sum of the crankshaft rotational speed integrated values is smaller than the set value, the three-way solenoid valve is operated according to the corrected duty ratio which is larger than the duty ratio corresponding to the engine operating state at that time by the correction amount. 4 is duty controlled. At that time, the supply amount of lubricating oil supplied to the engine becomes larger than the operation state adaptation amount.

The control unit 6 used in this embodiment
Is because the amount of lubricating oil supplied increases until the sum of the integrated values of the crankshaft rotation speed reaches the set value, and white smoke is likely to be generated from the exhaust pipe. The control amounts of the devices (ignition device, exhaust timing changing device, air fuel consumption changing device, etc.) are also configured to be corrected with respect to the engine operating condition adaptation amount.
That is, at that time, the control amount is corrected by changing the air fuel consumption by delaying the ignition timing of the engine 2, delaying the exhaust timing, or increasing the air amount or reducing the fuel by the cab solenoid. All of these controls may be performed, or any one of them or a combination of a plurality of controls may be performed.

In the control unit 6, the control amounts of these control devices also correspond to the correction amounts of the supply amount correcting means 13 and become the engine operating condition adaptation amount as the total sum of the crankshaft rotational speed integrated values increases. It is configured to gradually change as it approaches.

In FIG. 2, reference numeral 15 is a reset switch used when the engine parts (cylinder, piston, crankshaft, etc.) are replaced and the running-in operation is required again. When the reset switch 15 is turned on, the sum total data of the crankshaft rotational speed integrated values recorded in the microcomputer 12 is erased. That is, when the reset switch 15 is turned on, the lubricating oil supply amount is corrected to a larger amount suitable for the break-in operation.

Next, the operation of the lubricating oil supply system 1 for a two-cycle engine according to the present invention will be described with reference to FIG. When the main switch 7 is turned on, first, the control unit 6 is initialized. After the engine is started, the rotation speed calculation means 10 of the control unit 6 is started in step P ₁ .
The throttle opening calculation means 11 calculates the crankshaft rotation speed and the throttle opening, and outputs the crankshaft rotation speed signal and the throttle opening signal to the microcomputer 12, respectively.

In step P ₂ , the microcomputer 12 reads out the duty ratio D corresponding to the crankshaft rotational speed and the throttle opening from the map, and in step P ₃
The total sum N _C of the crankshaft rotational speed integrated values is calculated.

After that, the microcomputer 12 determines in step P ₄ whether or not the total sum of the crankshaft rotational speed integrated values is equal to or greater than a predetermined numerical value A. Then, the process proceeds to step P ₅ in the case the sum of the crankshaft rotational speed integrated value is numeric A above, the duty ratio D of the duty ratio read in the step P ₂ at the time of duty control three-way electromagnetic valve 4 Then, in step P ₆ , the solenoid of the three-way solenoid valve 4 is energized.

That is, at this time, the three-way solenoid valve 4 is duty-controlled at the duty ratio as in the map, and the lubricating oil is supplied to the engine 2 by the operation-condition adaptable amount. Further, at this time, the control amount of the engine control device described above is also set as the operation state adaptation amount.

If the total sum of the crankshaft rotational speed integrated values is smaller than the numerical value A in step P ₄ , step P _{4
In step 7} , the supply amount correction means 13 calculates the duty ratio correction amount ΔN _C. This correction amount ΔN _C is the sum N of the crankshaft rotational speed integrated values calculated by the microcomputer 12.
_It is obtained by multiplying _C by a function F as shown in FIG. That is, the correction amount ΔN _C gradually decreases as the total sum of the crankshaft rotational speed integrated values increases.

Then, in step P ₈ , the correction amount ΔN _C is added to the above-mentioned duty ratio D to calculate the correction duty ratio. At this time, the control amount of the engine control device is also corrected corresponding to the correction amount ΔN _C so that the exhaust gas temperature becomes higher. Then, in step P ₆ , the solenoid of the three-way solenoid valve 4 is energized in accordance with this corrected duty ratio. That is, at this time, the three-way solenoid valve 4 is duty-controlled with the corrected duty ratio, and the engine 2
The amount of lubricating oil supplied to the engine is larger than the operating condition conforming amount. As the amount of lubricating oil to be increased, for example,
It is set to about 50% of the operating condition adaptation amount at the maximum.

After energizing the solenoid in step P ₆ , the process returns to step P ₁ and the above-described operation is repeated again to supply the lubricating oil to the engine 2.

Therefore, the lubricating oil supply amount is larger than the engine operating condition conforming amount at the beginning of use of the engine, and decreases as the running-in operation progresses to become the engine operating condition conforming amount.
For this reason, the lubricating oil supply amount is controlled to an optimum amount for operating the engine from the start of engine use to the entire engine use period.

In this embodiment, the correction amount ΔN _{C is set} to the function F
Although an example in which the correction duty ratio obtained by adding the correction amount to the duty ratio D is recorded, a correction duty ratio map in which the correction duty ratio obtained by adding the correction amount to the duty ratio D is recorded may be used instead of the calculation. In such a case, the corrected duty ratio map is read instead of performing the above-described calculation in step P ₇ of FIG. This use of the correction duty ratio map, until the total sum N _C of the crank shaft rotational speed integrated value reaches the set numerical A, for example a crank shaft rotational speed Ya total N _C of the crank shaft rotational speed integrated value is changed If the throttle opening etc. is constant,
The amount of lubricating oil supplied is gradually reduced.

Further, in the present embodiment, the time when the running-in operation of the engine ends is calculated by the sum of the integrated values of the crankshaft rotation speed, but it can be calculated based on the traveling distance in addition to this. In such a case, the traveling distance data is input to the control unit from the speedometer, and the lubricating oil supply amount is corrected until the traveling distance reaches 1000 km, for example.

Further, the lubricating oil supply amount can be increased in accordance with the temperature rise of the portion of the engine where the lubricating oil is required. That is, the temperatures of the center bearing and the crankcase that rotatably support the crankshaft 2a of the engine 2 are measured, and the lubricating oil supply amount is increased in accordance with the temperature. The temperature measurement location may be a location near the exhaust port of the cylinder, or the temperature of the gas in the crankcase may be measured.

Furthermore, in the embodiment, the example in which the present invention is applied to the lubricating oil supply device having the structure for controlling the duty of the three-way solenoid valve 4 is shown. However, the present invention has a structure for controlling the discharge amount of the lubricating oil pump. It goes without saying that it can also be applied to a lubricating oil supply device.

[0036]

As described above, the lubricating oil supply device for a two-cycle engine according to the present invention has a lubricating oil pump for supplying the lubricating oil to the two-cycle engine, and an amount of lubricating oil supply adapted to the operating condition of the engine. The control device for controlling the engine is provided with this control device, and the lubricating oil supply amount is set from the operating condition adaptation amount until the total sum of the engine crankshaft rotation speed integrated values from the start of engine use reaches a predetermined value. Since the lubricating oil supply amount correcting means for increasing the amount is provided, the lubricating oil supply amount becomes larger than the engine operating condition conforming amount at the beginning of engine use and decreases as the running-in operation progresses to become the engine operating condition conforming amount.

Therefore, the lubricating oil supply amount is controlled to an optimum amount for operating the engine from the start of engine use to the entire engine use period. For this reason, the lubricating oil supply accuracy can be improved and the reliability of the engine can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a lubricating oil supply device for a two-cycle engine according to the present invention.

FIG. 2 is a block diagram of a control device used in a lubricating oil supply device for a two-cycle engine according to the present invention.

FIG. 3 is a flowchart showing the operation of the lubricating oil supply system for a two-cycle engine according to the present invention.

FIG. 4 is a graph showing a relationship between a correction amount and a crankshaft rotational speed integrated value total sum.

[Explanation of symbols]

 1 Lubricating Oil Supply Device 2 Engine 3 Lubricating Oil Pump 4 Three-way Solenoid Valve 5 Lubricating Oil Tank 6 Control Unit 12 Microcomputer 13 Supply Amount Correcting Means

Claims (1)

[Claims] 1. A lubrication oil pump for supplying lubrication oil to a two-cycle engine, and a control device for controlling the lubrication oil supply amount to an amount suitable for engine operating conditions.
A lubricating oil supply amount correcting means is provided to increase the lubricating oil supply amount by a set amount from the operation state conforming amount until the total sum of the engine crankshaft rotation speed integrated values from the start of engine use reaches a predetermined value. A lubricating oil supply device for a two-cycle engine, characterized by: