JPS61217397A - Lubrication system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lubrication system used in a lubrication system in which a single pump is branched into a plurality of lubrication systems, and in particular, to The present invention relates to a refueling system in which refueling can be completed with an accurate preset amount regardless of the refueling state of the other refueling systems when at least one of the systems is a preset refueling system.

[Prior art]

Generally, a preset type oil supply device has a configuration in which a pump, a flow meter, and a solenoid valve are provided in the middle of a line of piping, and a refueling nozzle is provided at the tip of the piping via a hose. For this reason, after presetting the desired amount of oil by the presetting means, if the oil supply nozzle is opened and the oil supply nozzle is opened. The oil based on the rated discharge amount of the valve is supplied, and when the amount of oil supplied reaches a value just before the preset amount, which takes into account the overflow amount due to the valve closing operation of the solenoid valve, a quantitative valve closing signal is sent. When the output is applied, the amount of oil added to the amount of overflow accompanying the closing operation of the solenoid valve is refilled, so that an accurate preset amount of oil is supplied.

Since such a preset type refueling system is one in which one pump and one solenoid valve are provided for one gasoline gauge machine, there is a one-to-one relationship between the refueling system and the refueling system. As a result, the rated discharge amount (discharge flow rate) of the pump,
If the amount of overflow associated with the closing operation of a solenoid valve is known in advance, if the solenoid valve is closed with an amount of oil that is less than the preset amount by this amount of overflow, the preset lubrication can be performed without excess or deficiency. can be done.

However, in the case of a lubrication system in which one pump is branched into multiple lubrication systems, even if the discharge amount of the pump is the rated discharge amount, the number of lubrication systems that are performing lubrication work may vary depending on the number of lubrication systems. The discharge amount (discharge flow rate) to the oil supply system changes. As a result, the amount of travel required until the solenoid valve is fully closed changes. For this reason, there is a drawback that the more the number of refueling systems during actual refueling, the smaller the actual refueling amount becomes than the preset amount.

[Problem that the invention seeks to solve]

The present invention was made in view of the above-mentioned drawbacks of the prior art, and in a refueling system equipped with multiple refueling systems using one pump, accurate refueling can be achieved regardless of the refueling work status of the other refueling systems. To provide a refueling system that can finish refueling at a preset amount.

[Failure to solve the problem]

In order to solve the above problems, the configuration adopted by the refueling system according to the present invention is such that each refueling system is provided with refueling detection means for detecting whether or not refueling is in progress, and at least one of the refueling systems is refueled. By providing a solenoid valve in the refueling system, the refueling system becomes a preset refueling system, and the preset refueling system is provided with presetting means for presetting a desired amount of refueling at the time of refueling, and the flow meter measures the amount of refueling at the time of preset refueling. providing a 1' preset control means for closing the solenoid valve when the amount of oil supplied reaches a predetermined amount with respect to the amount preset by the preset means;
and responds to the input of a detection signal from the refueling detection means of each refueling system, and sets the opening time of the solenoid valve that enables refueling with the remaining amount of refueling relative to the preset amount, so that the refueling amount reaches the final preset amount. The present invention is characterized in that a second preset control means is provided for controlling the solenoid valve to open by the set valve opening time so that the valve opening time is reached.

〔Example〕

Hereinafter, an example will be given in which the refueling system according to the present invention is applied to a fixed gasoline metering machine, and one pump branches into two refueling systems, one of which is a preset refueling system.
This will be described in detail together with the embodiments shown in FIGS. 1 to 9.

First, in Figure 1, 1 is a fixed type Solin weighing machine, 2 is a fixed type
3 indicates a machine frame of the gasoline metering machine, and 3 indicates a common pipe whose one end is connected to an underground tank (not shown) and whose other end projects into the machine frame 2. Reference numeral 4 denotes a constant discharge type pump provided in the middle of the common pipe 3, and the pump 7°4 is rotatably driven by a pump motor 5.

6.7 is a branch pipe branched from the common pipe 3 on the discharge side of I 7f 4, and flowmeters 8 and 9 for measuring the amount of oil supplied are provided in the middle of each branch pipe 6. The flow meters 8 and 9 include a pulse transmitter 1o that transmits a pulse signal proportional to the flow rate of the fluid to be measured.

11 is installed. 12.13 is also branch piping 6
．． 7 is a solenoid valve installed in the middle of each military solenoid valve 12, 1.
3 is opened and closed by an on-off valve signal from a control device 28, 28' which will be described later. Note that the solenoid valve 13 may be provided as necessary. 14. , 15 are hoses having one end connected to the branch pipes 6 and 7, and a refueling nozzle 16.17 for refueling the vehicle is attached to the other end of the hose 14.15.

Reference numerals 18 and 19 indicate nozzle storage sections provided in the machine frame 2 for storing the refueling nozzles 16 and 17, and 20 and 21 indicate nozzle switches attached to the nozzle storage sections j8 and 19, respectively.゜21 is the oil supply nozzle 16.
17 from the nozzle housings 18 and 19, and the refueling nozzle 16.17 is removed from the nozzle housings 18.
By multiplying it by 9, it can be opened. 2
Reference numerals 2 and 2.3 indicate a display meter for displaying the amount of refueling, and 24 a presetting device for presetting the amount of refueling or amount of refueling (hereinafter referred to as refueling amount) at the time of preset refueling. 10t, 20/
,,30t,40tX trench i,oo.

A push-button preset switch is used to preset yen, 1,500 yen, 2,000 yen, and 3,000 yen. Note that the preset device is a dial type preset switch instead of the push button type preset switch.

A numeric keypad preset switch, a card league type preset device, etc. may be used, and may be provided separately from the weighing machine 1. In the figure, 25 is the price (unit price) for the unit price and flow rate.
Since the unit price setting device 25 is not operated unless the price changes, it is usually installed inside the casing of the gasoline metering device 1.

Thus, in this embodiment, the branch pipe 6, the flow meter 8, the pulse transmitter 10. Solenoid valve 12, hose 14, refueling nozzle 16
, a nozzle switch 20 , a J indicator 22 , a preset oil supply system 26 , and a branch pipe 7 , a flowmeter 9 , a flowmeter transmitter 11 , a solenoid valve 13 , a hose 15 , a refueling nozzle 17 , a nozzle switch 21 , and an indicator. A normal oil supply system 27 is constituted by 23 and the like.

Next, in FIGS. 2 and 3, 28 and 28' are control devices used in this embodiment, one control device 28 is a control device for a no-reset oiling system as detailed in FIG. The control device 28' is a control device for a normal oil supply system. Note that each control device 28, 2 except for the preset control function
Since 8' has substantially the same configuration and the same function, one control interface circuit 29 (hereinafter referred to as I/
T circuit 29), a processing device 30 consisting of a CPU, etc.
R for storing the programs shown in Figures 6 to 8.
A program memory 31 consisting of an OM and a data memory 32 consisting of a RAM for storing the data shown in FIGS. 4 and 5 are provided, and these are connected via a data bus 33. Furthermore, an interval counter 34 , a motor drive circuit 35 , a solenoid valve drive circuit 36 , a refueling end signal generation circuit 37 , and a refueling end signal input circuit 38 are provided in the control device 28 , and these are connected to the I/F circuit 29 . ing. Further, the I/1' circuit 29 includes a pulse transmitter 10, a nozzle switch 20, a display meter 22, a preset device 24, and a unit price setting device 2 provided in the gasoline meter 1.
5 etc. as shown in Figure 3.

Here, the interval counter 34 is a seventh
This is used for the interrupt processing shown in Figures and Figure 8.
It constantly counts the clock pulses from a clock pulse oscillator (not shown), resets the count to zero when a pulse signal is input from the pulse oscillator 10, and starts counting the clock pulses again. , has a function of counting the arrival interval of pulse signals by constantly repeating the above operation. The count value of the interval counter 340 is then read by the processing device 30 and used to determine whether or not the oil supply system is being refueled.

Under the control of the processing device 30, the motor drive circuit 35 closes the nozzle switch of the first operated refueling system among the refueling systems (in this embodiment, the nozzle switch 20 or 21 that closes earlier). It has a function of outputting a motor drive signal to the Ponzo motor 5 when this occurs, and outputting a motor stop signal to the Ponzo motor 5 when all nozzle switches of each oil supply system are opened.

The electromagnetic valve drive circuit 36 performs the following operations under the control of the processing device 30. ■Regardless of normal lubrication or preset lubrication,
When the nozzle switch 20 (21) is closed, the solenoid valve 1.2 (13) is opened.

(2) During normal refueling, the solenoid valve 12 (13) is closed when the nozzle switch 20 (21) is opened.

■In preset lubrication, when the preset amount reaches a predetermined amount (details will be described later), the solenoid valve 12 (13) is closed. The valve opening/closing operation is performed for the solenoid valve opening time which includes the set maximum overflow amount that may occur due to the closing of the solenoid valve 12 as the oil supply amount, and this opening/closing operation is repeated as many times as necessary.

When the count value of the interval counter 34 is equal to or greater than a predetermined value under the control of the processing device 30, the refueling end signal generation circuit 37 determines that the actual refueling operation of the relevant refueling system has ended, and sends the signal to another control device (main unit). In the embodiment, the control device 28'
) outputs a refueling end signal.

Further, the refueling end signal input circuit 38 has a function of inputting a refueling end signal from another control device (control device 28' in this embodiment).

Note that the processing device 30 counts the pulse signals from the i9 pulse transmitter 10, outputs the counting results to the display meter 22, and displays each digit by a display meter control circuit (not shown) provided therein. Drive the device.

When the nozzle switch 20 is closed during the next refueling operation, the display meter 22 resets the previous display value to zero.

Next, FIG. 4 is a block diagram showing each storage area in the data memory 32, in which 41 indicates A? from the pulse generator 10. 42 is a preset amount storage area that stores the preset amount (P) by the preset device 24, and 43 is a constant value from the preset amount (P). The predetermined amount setting area 44 sets the predetermined amount (Ql) obtained by subtracting the amount (K) as (Qt = P K ), and 44 is the overflow amount ΔQ while the solenoid valve 12 closes when the predetermined amount (Ql ) is reached. a remaining amount calculation area for calculating the remaining amount (ε) for the set amount (P) as (ε=p−Qo) in a state where the deviation has occurred;
Reference numeral 5 denotes an other system status storage area that stores the status of the other system based on the presence or absence of a refueling end signal input from another refueling system, and 46 an electromagnetic valve opening area that stores a table 51 detailed in FIG. Each valve time setting table area is shown. Thus, the data memory 32 has each of the areas 41 to 41 described above.
46. Note that the certain amount (K) is the maximum overflow amount (Δ
A predetermined amount that does not reach the preset amount (P) even if QmaX) is taken into consideration is set.

Further, FIG. 5 shows a solenoid valve opening time setting table (hereinafter referred to as "table") stored in the solenoid valve opening time setting table area 46 of the data memory 32 mentioned above, and the table 51 is a time tank. 5□2.1 system column 53A1
Consists of 2 system column 53B,...N system column 53N,
The relationship between the operating time of Inzo 4 and the discharge amount is stored. In other words, when only one refueling system is operating,
The time tank 52 uses the discharge amount in the 1-system column 53A as the remaining amount (ε).
When the pump operation time is set and two oil supply systems are operating at the same time, the discharge amount in the two system column 53B is set as the remaining amount (
The pump operation time of the time tank 52 is set as ε). Note that the discharge amount in each of the system columns 53A to 53N is defined as a value that includes the maximum overflow amount that may occur when the solenoid valve is closed after a set time has elapsed.

The present embodiment is constructed as described above, and its operation will now be described with reference to FIGS. 6 to 9.

First, the case in which normal lubrication is performed using the preset lubrication system will be described with reference to the flowchart of FIG.

When the vehicle to be refueled has stopped near the fixed gasoline metering machine 1, the operator removes the refueling nozzle 16 from the nozzle housing 18. This closes the nozzle switch 20 (step 83). Then, the processing device 30 determines whether a refueling end signal is input from the normal refueling system 27 or not.
It is read from the other system state storage area 45 of the data memory 32 (step S4). If the normal oil supply system 27 is not refueling, the bond motor 5 is likely stopped, so the bond motor 5 is driven via the motor drive circuit 35 (Stella 7'S6). On the other hand, if the normal refueling system 27 is refueling, the pump motor 5 is already being driven, so the next Stella fS7 opens the solenoid valve 12 via the solenoid valve drive circuit 36, and the previous refueling operation is performed again. Display meter 2 accompanying
The displayed value of No. 2 is reset to zero (step S8).

In the above state, when the fuel supply nozzle 16 is inserted into the fuel tank and the valve is opened, the oil in the tank is transferred to the common pipe 3, the pump 4,
Oil is supplied from a fuel nozzle 16 via a branch pipe 6, a flow meter 8, a solenoid valve 12, and a hose 14. At this time, the measured flow rate accompanying refueling is measured by the flow meter 8, and the flow rate is measured by the flow meter 8.
From 0, a no.9 pulse signal is output, and the amount of refueling (Qo) is displayed every moment.
) is stored in the pulse count area 41 of the data memory 32, and this refueling amount (Qo) is read out and displayed as an integrated value on the display meter 22 (step 510). When the refueling progresses and reaches the desired amount of refueling, the refueling nozzle 16 is closed and stored in the nozzle storage section 18.

As a result, the nozzle switch 20 is opened in step 51.
2) In response to the input of this opening signal, the processing device 30 attempts to access the other system state storage area again (step 521).
In the next step S22, when it is determined that the normal lubrication system is refueling, refueling is terminated, and when it is determined that the normal lubrication system is not refueling, the motor drive circuit 35
A motor stop signal is output to stop the pump motor 5 (step 523).

Here, during the above-mentioned normal refueling, calculation of the refueling amount is executed by flow rate pulse interrupt processing shown in FIG. 7.

That is, when a master pulse signal is input from the pulse generator 10, the /4' pulse count area 41 of the data memory 32
performs pulse counting under the control of the processing device 30,
The amount of oil supplied (Qo) is calculated (step 551).

On the other hand, the interval counter 34 constantly counts clock pulses, resets this count value every time a pulse signal is input, and repeats the operation of counting clock pulses again (step 552).

Further, whether or not the arrival of the pulse signal has stopped is determined by the timer interrupt process shown in FIG. That is,
The processing device 30 constantly monitors the interval counter 34 and reads the count value of the interval counter 340 (step 561).

Then, use the interval counter in the next Stella fS62.
It is determined whether the 340 count value is greater than or equal to a predetermined value (for example, 500), and if it is less than or equal to the predetermined value, the output of the refueling end signal is reset as the cruise signal continues to be transmitted (Stella 7'563).

On the other hand, if the count value is greater than or equal to the predetermined value, it is assumed that the pulse signal transmission has stopped, and the output of the refueling end signal is set (step 564).

Thus, when the output of the refueling end signal is set, the processing device 30 outputs the refueling end signal to the other control device 28' via the refueling end signal generating circuit 37.

Therefore, in this embodiment, the flowchart shown in FIG. 8 constitutes a specific example of the refueling detection means.

Note that the above operation is for the case where normal lubrication is performed using the reset lubrication system 26, but it is exactly the same when normal lubrication is performed using the normal lubrication system 27. Therefore, a description of the operation in this case will be omitted, but when the normal refueling is completed, the refueling end signal generation circuit (37') on the control device 28' side sends the following message:
A refueling end signal is input to the refueling end signal input circuit 38 on the control device 28 side, and this signal is sent to the other system status storage area 45.
is stored in Next, the operation when performing preset oil supply using the preset oil supply system 26 will be described with reference to FIGS. 6 and 9.

First, when the customer informs him of the desired amount of refueling, the operator operates the precert device 24 to reset it (P
), for example, preset 40t (step Sl)
. Then, this preset amount (P) is stored in the preset amount storage area 42 of the data memory 32. The predetermined value setting area 43 contains a value (Ql) obtained by subtracting the predetermined value (K) from the preset amount (P), for example, the predetermined value (K
) is set to 24, then 381 is set (step 82).

When the preset setting process is completed as described above, the refueling operation is started in steps 83 to S8 as in the case of normal refueling described above. Then, in step S9, it is determined whether or not preset oil supply is being performed. Since the current refueling is preset refueling, the process moves to the next step S13, where the instantaneous refueling amount (Qo) is stored in the pulse count area 41, and this refueling amount is displayed as an integrated value on the display meter 22.

In this manner, while refueling is in progress, the processing device 30 accesses the noggle count area 41 and predetermined amount setting area 43 of the data memory 32, and determines when the refueling amount (Qo) has reached the predetermined amount (Ql). It is determined whether or not (step 514
). Now, when the oil supply amount (Qo) reaches a predetermined amount (Ql), the processing device 30 sends a solenoid valve closing signal to the solenoid valve drive circuit 36.
and closes the solenoid valve 12 (step 515).

As a result, the electromagnetic valve 12 closes from the fully open state to the fully closed state, and accordingly, an overtravel amount (ΔQ) is generated (see FIG. 9), but this overtravel amount (ΔQ) is also is calculated and displayed on the display meter 22 (step 516). On the other hand, as described above, since the pulse stop detection process is always performed as a timer interrupt process in accordance with the flowchart shown in FIG. , 864, and monitors whether the arrival of the pulse signal has stopped.
A at step S17 in the figure? When it is determined that the pulse has stopped, the process moves to the next step 818. This step S1
8 is the preset amount (P) in the preset amount storage area 42
By comparing the oil supply amount (Qo) in the top pulse count area 41, the oil supply amount (Qo) can be set to the preset amount (P).
If the refueling amount (Qo) has exactly reached the preset amount (P), the setting of the preset amount (P) in the preset amount storage area 42 is canceled (
step 519). Then, when the refueling nozzle 16 is connected to the nozzle housing 18 and the nozzle switch 20 is opened (step 520), it is read whether or not other refueling systems are refueling (step 521), similarly to the normal refueling operation described above.
), if it is being refueled, it ends the refueling, and if it is not refueling, it stops the dump motor 5 and ends the refueling (Stella 7° 822, 523).

Thus, each of the steps 813 to 18 described above constitutes the first preset control means according to this embodiment.

On the other hand, in the determination of Stella 7°818, the maximum amount of travel (Δ
The oil supply amount (Qo) at which QmaX) occurs is the preset amount (P
), the inching process shown in steps 830 to S36 is executed.

Therefore, the processing device 30 accesses the remaining amount calculation area 44 of the data memory 32 and calculates the difference between the actual oil supply amount (Qo) at that time and the preset amount (P), that is, the remaining amount (ε=p
-QO) (step 530). The processing device 30 also stores information from the other system state storage area 45 on the normal refueling system 27.
It is read out whether or not it is being refueled (step 531). Now, it is assumed that the remaining amount (ε) is 0.3t in the reading at step S30, and that the normal oil supply system 27 is currently refueling in the reading in step 831.

Next, the processing device 30 accesses the solenoid valve opening time setting table area 46 and reads out the table 51 in FIG.
Table designation is performed based on the relationship between the remaining amount (ε) determined in step 830 and other oil supply systems determined in step 31 (step 532). That is, in the case of the specific example, the normal oil supply system 2
Since No. 7 is being refueled, the 2-system column 53B is designated and the remaining amount (ε) is designated as 0.301. As a result, when looking at the time column 52 corresponding to the two-system column 53B of the table 51, it is found that the solenoid valve opening time is 990 mtea, and in the next step 833, 990 m sec is set.

Thus, the processing device 30 provides the solenoid valve drive circuit 36 with 990
'm5ae is designated, a solenoid valve opening signal is output, and the solenoid valve 12 is opened (step 534). As a result, an amount of oil equivalent to 0.30 t is discharged from the oil supply nozzle 16, and the amount of oil supplied (Qo) at this time is 7″836).
The process returns to step S15 again, the solenoid valve 12 is closed, and the process proceeds to steps S16→817→S18.

To explain the above state using FIG. 9, Δt! represents the electromagnetic valve opening time (990 m5ec in the specific example), and ql represents the remaining amount including the overflow amount (0.31 in the specific example).

Furthermore, despite the above-mentioned inching processing operation, the table 51 normally shows the power supply frequency and pressure because the flow rate includes the maximum overflow amount corresponding to the valve opening time.

The flow rate is often lower than the table value depending on the hose length, etc. Therefore, it is determined in step S18 that the amount of oil supplied (
Qo) does not reach the preset amount (P), the aforementioned steps 530-836 are repeated again, and the remaining amount q2 is refilled as shown in FIG. In this way, the processing device 30 repeats the process m times as appropriate until the difference between the oil supply amount (Qo) and the preset amount (P), that is, the remaining amount (ε) is less than 0.01 (less than the measurement tolerance). .

As a result, the actual oil supply amount Qo is Qo''Qt+ΔQ+q1+(12°''+P in Qm), and very highly accurate preset oiling can be performed.

Thus, each of the steps 830 to 36 described above constitutes the second preset control means according to this embodiment.

In the above specific example, it is assumed that the normal oil supply system 27 is being refueled, but when the oil supply system 27 is not in use, it is sufficient to specify the 1 system column 53A of the table 51.

Although the embodiments of the present invention have been described in detail above, the refueling system according to the present invention is not limited to fixed gasoline metering machines, but can also be applied to suspended gasoline metering machines, LPG filling devices, etc. Of course.

Further, in the embodiment, the pump 4 is described as being installed in the machine frame 2, but the pump 4 is configured as a so-called submerged pump installed in a tank, and a plurality of measuring machines of the submerged pump are branched. The connection may be made by piping.

Furthermore, in the embodiment, one side is the normal oil supply system 27, but
Both may be preset oil supply systems, or three or more oil supply systems may be used.

〔Effect of the invention〕

Since the oil supply system according to the present invention has been described in detail above, in a oil supply system in which a single pump is used to supply oil to a plurality of oil supply systems, at least one of the systems is a preset oil supply system. Even in such a case, highly accurate preset lubrication can be performed regardless of the usage status of other systems, and smooth lubrication service can be provided.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram showing a partially cutaway fixed gasoline metering machine used in this embodiment, Fig. 2 is a block diagram showing a fuel supply system and control system, and Fig. 3 is used in this embodiment. A specific circuit configuration diagram, FIG. 4 is a configuration diagram showing each storage area in the data memory, FIG. 5 is a specific configuration diagram of the solenoid valve opening time setting table, and FIG. 6 is a flowchart showing the preset lubrication processing operation. , Figure 7 is a flowchart showing the refueling amount calculation process, Figure 8 is a flowchart showing the oil supply amount calculation process.
The figure is a flowchart showing the pulse stop detection process, and FIG. 9 is a diagram showing the flow velocity--electromagnetic valve opening time characteristic during the preset oil supply operation. 1...Fixed gasoline metering machine, 2...Machine frame, 3...
・Common piping (common flow path), 4...pump, 5...pump motor, 6,'7...branch piping (branch flow path),
8, 9...Flowmeter, 10.11...(Russ transmitter, 12.13...Solenoid valve, 14.15...Hose (
Branch flow path), 16° 17... Refueling nozzle, 18.19
... Nozzle storage section, 20.21 ... Nozzle switch, 22.23 ... Display meter, 24 ... Preset device, 25 ... Unit price setting device, 26 ... Preset oil supply system, 27. ...Normal oil supply system, 28, 28'...Control device, 29...I/F' circuit, 30...Processing device, 31...Program memory, 32...Data memory, 34... - Interval counter, 35... Motor drive circuit, 36... Solenoid valve drive circuit, 37... Refueling end signal generation circuit, 38... Refueling end signal input circuit, 41... Rigurusu count area, 42... Preset amount storage area, 43... Predetermined amount setting area, 44
... Remaining amount calculation area, 45 ... Other system status storage area, 46 ... Solenoid valve opening time setting table area, 51
...Solenoid valve opening time setting table.

Claims (3)

[Claims] (1) A single pump is provided in a common flow path, and a flow meter, a hose, and a refueling nozzle are provided in multiple branch flow paths branching from the outflow side of the pump, thereby configuring multiple oil supply systems. In the system, each of the refueling systems is provided with a refueling detection means for detecting whether or not refueling is being performed, and at least one of the refueling systems is provided with a solenoid valve to set the refueling system to a preset refueling system. The preset oil supply system is provided with a preset means for presetting a desired oil supply amount at the time of refueling, and when the oil supply amount measured by a flowmeter at the time of preset oil supply reaches a predetermined amount with respect to the preset amount by the preset means. The electromagnetic valve is provided with a first preset control means for closing the solenoid valve when the solenoid valve is closed, and responsive to the input of a detection signal from a refueling detection means of each refueling system, and capable of supplying a refueling amount corresponding to the preset amount. A refueling system comprising a second preset control means that sets a valve opening time and controls the solenoid valve to open for the set valve opening time so that the amount of oil supplied reaches a final preset amount. . (2) The refueling system according to claim (1), wherein the refueling detection means detects based on the arrival time of a flow rate signal from a flow meter. (3) The oil supply system according to claim (1), wherein the second preset control means is performed by reading data in a solenoid valve opening time setting table in the control device.