JP2000220429A - Automatic oil supplying device for stationary engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To replace oil at a proper timing by providing a control device for actuating a discharging pump and a supplying pump when the deterioration degree of oil detected by an oil deterioration sensor is a reference value or more. SOLUTION: An oil deterioration detecting sensor 5 is interposed within an oil pan 3. A supplying pump 8 is interposed in the middle of a supplying pipe 6. A discharge pump 11 is interposed in the middle of a discharge pipe 9. The oil deterioration detecting sensor 5 is connected to the input side of a control device 12, and the supplying pump 8 and discharging pump 11 are connected to the output side of the control device 12. When the viscosity of oil is less than a reference value, the supplying pump 8 and discharging pump 11 are stopped. When the viscosity of oil is the reference value or more, the supplying pump 8 and discharging pump 11 are actuated. According to this, the replacement with new oil can be performed before the deterioration of oil is not progressed to avoid the oil lubricating failure of a stationary engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic oil supply device for a stationary engine used in a generator, a cogeneration system, and the like.

[0002]

2. Description of the Related Art Conventionally, stationary engines used in generators, cogeneration systems and the like have been required to be operated for a long period of time while omitting maintenance. The oil that circulates through the stationary engine has a limited service life and needs to be changed regularly, and needs to be changed in a complicated manner. However, stopping the stationary engine every time the oil is changed is troublesome.

In view of this, there is known an automatic oil supply device for a stationary engine in which an oil tank is provided separately from an oil pan and supplies oil (see, for example, JP-A-8-42318) (FIG. 14). . In the figure, a sub-tank 102 is attached to an engine 101 and a sub-tank 10
Numeral 2 communicates with the oil pan 101A of the engine 101 via the oil supply passage 103. A supply pump 104 is provided in the middle of the oil supply passage 103.

[0004] The oil supply path 103 or the supply pump 104 is provided with oil supply direction switching means 105. The oil supply direction switching means 105 is capable of switching the oil between a forward flow supply direction P and a backward flow supply direction Q. Oil is supplied from the sub tank 102 to the oil pan 101A in the forward flow supply direction P, and is recovered from the oil pan 101A to the sub tank 102 in the backward flow supply direction Q. That is, after the direction of the oil is set to the backward flow replenishment direction Q and the oil in the oil pan 101A is once extracted, the direction of the oil is switched to the forward flow replenishment direction P, and the oil whose degree of deterioration is improved in the sub tank 102 is removed. Oil pan 1
01A.

[0005]

However, in the conventional automatic oil supply device, the timing of oil change is not described, and it is difficult to accurately grasp the timing of oil change. If the timing of oil change is delayed, the operating time of the oil will be longer and the oil will deteriorate, and the oil that deteriorates significantly before the oil change will be used, and the oil that has deteriorated significantly will hinder the oil lubrication of the stationary engine. And adverse effects such as causing friction of the valve train due to deterioration of the oil.

Therefore, it is necessary to constantly replace and replenish oil to the stationary engine, and an automatic oil supply device disclosed in Japanese Utility Model Laid-Open No. 6-49704, for example, has been disclosed as meeting this requirement. In this automatic oil supply device, part of the oil circulated and supplied to the stationary engine flows into the upper part of the oil tank, and drops naturally into the oil pan through the return hose as the liquid level rises. , The oil is replaced.

However, in the oil tank, the oil in the oil tank and the oil recirculated from the oil pan are mixed, and the mixed oil is supplied to the oil pan. However, it gradually deteriorates, and fresh oil does not return to the oil pan, which hinders oil lubrication of the stationary engine. Further, as disclosed in Japanese Utility Model Laid-Open No. 7-22008, an automatic refueling device for a stationary engine is disclosed. The automatic refueling device of this stationary engine issues an alarm when the oil level of the oil pan falls below the lower limit. In this automatic refueling device, oil that has deteriorated during the period until the oil level reaches the lower limit cannot be detected, and the oil that has deteriorated during that period is used, which may hinder oil lubrication of the stationary engine. is there.

As described above, it is difficult to constantly monitor the degree of oil deterioration and replace the oil in the oil pan of the stationary engine at an appropriate timing in accordance with the degree of deterioration. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an automatic oil control system for a stationary engine that can change oil in an engine oil pan at an appropriate timing according to the degree of deterioration. To provide a feeding device.

[0009]

According to the first aspect of the present invention,
A replenishing tank attached to the engine separately from the oil pan, a replenishing pump for supplying oil from the replenishing tank to the oil pan, a discharge tank communicating with the oil pan, and oil in the oil pan. Pump for discharging oil to a discharge tank, an oil deterioration sensor disposed in the oil pan for detecting the degree of oil deterioration, and a case where the degree of oil deterioration detected by the oil deterioration sensor is equal to or more than a reference value. And a control device for operating the discharge pump and the replenishing pump and stopping the discharge pump and the replenishing pump when the degree of deterioration of the oil is less than the reference value.

According to a second aspect of the present invention, there is provided a replenishing tank provided separately from an oil pan in an engine, a replenishing pump for feeding oil from the replenishing tank to the oil pan,
A discharge tank that communicates with the oil pan, a discharge pump that sends oil in the oil pan to the discharge tank,
An oil level detection sensor for detecting the position of the oil level of the oil in the oil pan, and a rate of drop of the oil level per unit time ΔL / ΔT in the oil pan, and calculating the level of the oil per unit time A predicted deterioration time T0 associated in advance corresponding to the descending rate .DELTA.L / .DELTA.T is obtained, and the used oil use time T of the oil from the time when the oil is in a new oil state is determined as the predicted deterioration time T0. And a control device for operating the discharge pump and the replenishment pump when it becomes necessary.

According to a third aspect of the present invention, in the automatic oil supply device for a stationary engine according to the second aspect, the control device is configured to determine that the estimated deterioration time To is a predetermined time from when the oil is in a new oil state. It is determined whether or not the oil change reference time Ts is equal to or longer than the oil change reference time Ts. If the estimated deterioration time To is equal to or longer than the oil change reference time Ts, when the oil use time T reaches the oil change reference time Ts, The pump and the replenishing pump are operated, and the expected deterioration time T
If o is less than the oil change reference time Ts, the discharge pump and the replenishment pump are activated when the oil use time T reaches the expected deterioration time To.

(Function) In the first aspect of the present invention,
An oil deterioration sensor constantly detects the degree of oil deterioration. A signal indicating the degree of oil deterioration is sent to the control device. The control device activates the discharge pump and the replenishing pump when the degree of oil deterioration is equal to or higher than the reference value, and stops the discharge pump and the replenishment pump when the degree of oil deterioration is less than the reference value.

The oil in the oil pan is sent to a discharge tank by a discharge pump. Also, new oil in the supply tank is sent into the oil pan by the supply pump. In this way, the oil in the oil pan is replaced with a new one. In the present invention, the position of the oil level of the oil in the oil pan is detected by the oil level sensor. The signal of the oil level is
Sent to the controller.

The control unit calculates the actual oil level drop rate ΔL / ΔT per unit time, and determines the expected deterioration time T 0 corresponding to the oil level drop rate ΔL / ΔT per unit time. You. Here, the expected deterioration time T0
Is a time previously associated with ΔL / ΔT, and is a time from when the oil level in the new oil state decreases to the oil level when oil replacement is to be performed.

The control device measures the oil use time T based on the time when the oil level is in a new oil state. When the oil use time T reaches the expected deterioration time T0 by the control device, the discharge pump and the supply pump are operated. That is, the oil in the oil pan is discharged by the discharge pump. Also, new oil in the supply tank is sent into the oil pan by the supply pump.
In this way, the oil in the oil pan is replaced with a new one.

According to the third aspect of the present invention, the control device determines whether or not the estimated deterioration time To is equal to or longer than an oil change reference time Ts which is a fixed time from the time when the oil is in a new oil state. The following operation is performed. That is,
If the expected deterioration time To is longer than the oil change reference time Ts,
When the oil use time T reaches the oil change reference time Ts, the discharge pump and the supply pump are operated.

If the estimated deterioration time To is less than the oil change reference time Ts, the discharge pump and the replenishment pump are operated when the oil use time T reaches the estimated deterioration time To.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

An automatic oil supply device for a stationary engine according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2, the stationary engine 1 includes a cylinder block 2 and an oil pan 3 mounted on a lower surface of the cylinder block 2.
A generator 4 is mounted on the front end of the stationary engine 1.

An oil deterioration detection sensor 5 is interposed in the oil pan 3. The oil deterioration detection sensor 5 includes:
A viscosity sensor that detects an increase in the viscosity of oil due to oil deterioration is used. A viscosity sensor is a sensor that measures the viscosity of a fluid.It fixes the center of an elongated magnetostrictive vibrating piece, immerses half of the piece in liquid, and drives longitudinal vibration in a shocking manner. It uses a circuit that changes the number (Iwanami Dictionary of Physical and Chemical Sciences, 5th edition, 10
25, February 20, 1998).

One end 6A of the supply pipe 6 is connected to the wall 3A of the oil pan 3, and the other end 6B of the supply pipe 6 is connected to the supply tank 7. A supply pump 8 is interposed in the supply pipe 6. One end 9A of the discharge pipe 9 is connected to the bottom surface 3B of the oil pan 3, and the other end 9B of the discharge pipe 9 is connected to the discharge tank 10. A discharge pump 11 is provided in the middle of the discharge pipe 9.

The oil deterioration detection sensor 5 includes a controller 1
The supply pump 8 and the discharge pump 11 are connected to the input side of the control unit 12 and the output side of the control device 12. The control device 12 includes a storage unit 12A and a calculation unit 12B. The storage unit 12A stores a reference value of the degree of oil deterioration. The operation in the present embodiment will be described with reference to the flowchart of FIG.

The degree of oil deterioration is constantly detected as oil viscosity by the oil deterioration detection sensor 5, and a signal of the oil viscosity is sent from the oil deterioration detection sensor 5 to the control device 12 (S1). The control device 12 calculates the detected oil viscosity C−the reference value C _{0 of} oil viscosity = ΔC (viscosity difference) (S2).

The control device 12 sets “ΔC <0” or “ΔC <0”
It is determined whether or not C ≧ 0 ”(S3). In S3,
When ΔC <0, it corresponds to the case where the viscosity of the oil is less than the reference value (the oil is in a dry state), and the supply pump 8 and the discharge pump 11 are stopped. When ΔC ≧ 0, when the viscosity of the oil is equal to or higher than the reference value (the oil is muddy)
And the supply pump 8 and the discharge pump 11 are operated as follows.

The controller 12 controls the oil discharge amount Qo,
The oil supply amount Qi is given as follows (S4).
That is, the oil discharge amount ΔQo is calculated by ΔQo = α × ΔC, and based on this ΔQo, the oil discharge amount Qo is calculated by the oil discharge amount Qo = ΔQo × Δt. The oil supply amount ΔQi is given by ΔQi = α × ΔC.
Based on the oil supply amount Qi, the oil supply amount Qi = ΔQ
It is calculated by i × Δt. Note that Δt is the supply pump 8,
The pump switch (not shown) of the discharge pump 11 is turned on
The operation time is determined in consideration of a value such as α × ΔC.

The oil in the oil pan 3 is supplied to the discharge pump 1
Emitted by 1. When the oil is discharged, new oil in the replenishing tank 7 is sent into the oil pan 3 by the replenishing pump 8 by the same amount as the discharged amount (S5, S5).
6). In this way, the degree of oil deterioration is always determined, and the oil in the oil pan 3 is replaced with a new one. Therefore, as shown in FIG. 4, the oil is maintained in a state close to the fresh oil state.

According to the above configuration, the control device 12,
The oil deteriorated in the oil pan 3 is discharged to the discharge tank 10 by the discharge pump 11 and the supply pump 8 according to the degree of deterioration of the oil, and the fresh oil in the supply tank 7 is always stored in the oil pan 3. Since the oil pan 3 is supplied, the oil pan 3 can always be filled with fresh oil having a low degree of deterioration.

As a result, the oil in the oil pan 3 can be constantly refreshed without delaying the timing of oil change, preventing trouble in oil lubrication of the stationary engine 1 and, for example, friction of the valve train due to deterioration of the oil. This has the effect of preventing an adverse effect such as causing the like. In short, the control device 12 can always determine the degree of oil deterioration and replace the oil with new oil before the oil deterioration progresses, thereby avoiding poor oil lubrication of the stationary engine 1.

In the present embodiment, the case where the supply pump 8 and the discharge pump 11 are arranged at different places has been described as an example, but the supply pump 8 and the discharge pump 11 And a single pump. This will be described with reference to FIG. In the figure, one end 21A of an oil pipe 21 is connected to a wall 3A of the oil pan 3, and the other end 21B of the oil pipe 21 is connected to a supply tank 22. In the middle of the oil pipe 21, the pump 23
And the pump 23 and the replenishing tank 2
A three-way valve 24 is interposed in a portion between the two. An oil pipe 25 branches off from the three-way valve 24, and a discharge tank 26 is connected to a distal end 25 </ b> A of the oil pipe 25. The rotation direction of the three-way valve 24 and the pump 23 is switched by the control device 27, and the pump 23 can be used for replenishing and discharging oil. Therefore, the pump 23 has the functions of the supply pump 8 and the discharge pump 11 of FIG.

In the present embodiment, an example has been described in which a viscosity sensor is used as an oil deterioration detection sensor, but the present invention is not limited to a viscosity sensor.
For example, a decrease in the base number of the oil, a dilution of the fuel, an increase in wear powder of parts of the stationary engine 1 and the like are caused by the deterioration of the oil. It can also be used.

Referring to FIGS. 6 to 12, an automatic oil supply apparatus for a stationary engine according to the second and third embodiments of the present invention will be described. The automatic oil supply device for a stationary engine according to the embodiment of the present invention has the same general configuration as the automatic oil supply device for the stationary engine according to the embodiment of the invention described in claim 1, and has the same configuration. Constituent parts are denoted by the same reference numerals, description thereof will be omitted, and only different parts will be described.

6 and 7, the oil pan 3 has:
An oil level detection sensor 31 is provided. There are a plurality of oil level detection sensors 31 (two in this embodiment).
) ON / OFF type oil position measurement sensors. That is, the oil level detection sensor 31 includes a first oil position measurement sensor 31A and a second oil position measurement sensor 31B disposed below the first oil position measurement sensor 31A at a predetermined distance ΔL. ing.

The first oil position measuring sensor 31A and the second oil position measuring sensor 31B are connected to the input side of the control device 32, and the output side of the control device 32 is connected to the supply pump 8 and the discharge pump 11. . The control device 32 includes a storage unit 32A and a calculation unit 32B. A table 33 (shown in FIG. 9), ΔL (first
(Distance from the oil position measurement sensor 31A to the second oil position measurement sensor 31B).

In the table 33 of FIG. 9, the liquid level drop rate ΔL / ΔT per unit time is 7 degrees, 8 degrees, 9 degrees.
Degrees, 10 degrees, 11 degrees, 7 degrees, 8 degrees, 9 degrees, 1 degree
The generic name of each group at 0 and 11 degrees is A, B, C,
D and E (A, B, C, D and E in FIG. 12 have the same meanings as A, B, C, D and E in the table 33 in FIG. 9). The predicted deterioration time T0 and the amount of oil discharge are previously associated with the example of the liquid level drop rate ΔL / ΔT per unit time. For example, by keeping the oil level drop rate ΔL / ΔT per unit time of oil constant, ΔL / ΔT and time To
Is set.

Thus, the degree of decrease in the oil in the oil pan can be grasped as the estimated deterioration time of the oil. As shown in FIG.
Is the time required for the oil to decrease from the oil level (Lmax) in the fresh oil state to the oil level (Lmin) when the oil should be changed. Also, the liquid level drop rate per unit time Δ
The oil discharge amounts Qmax, Q1, Q2 are associated with L / ΔT. It should be noted that the oil discharge amounts Qmax, Q1,
In Q2, there is a relationship of "Qmax>Q1> Q2 >>...>0".

The operation of this embodiment will be described with reference to FIG. As shown in FIG. 7, the state in which the oil in the oil pan 3 is in a fresh oil state and the oil level is Lmax is defined as an initial state. The following operations are performed by the control device 32 from the initial state. First, the controller 32 reads ΔL in the storage unit 32A (S1), and a signal of ΔL is sent from the storage unit 32A to the calculation unit 32B.

The position of the oil level is detected as an ON state or an OFF state by the first oil position measurement sensor 31A and the second oil position measurement sensor 31B. The detected ON or OFF state signal is transmitted to the control device 32.
Sent to The use of the stationary engine 1 lowers the oil level. For example, in FIG. 10, the oil level falls in the order of (a) → (b) → (c) → (d).
In the state (a), the first oil position measurement sensor 31A is in the ON state, and the second oil position measurement sensor 31B is in the ON state.

In the state (b), the first oil position measurement sensor 31A is in the OFF state and the second oil position measurement sensor 31B is in the ON state. In the state (c), the first oil position measurement sensor 31A is in the OFF state and the second oil position measurement sensor 31B is in the ON state.
In the state (d), the first oil position measurement sensor 31A is in the OFF state, and the second oil position measurement sensor 31B is in the OF state.
It is in the F state.

The control device 32 determines that ΔT is ΔT = t2
−t1 (S2). Here, t1 is a time measured by detecting the moment when the first oil position measurement sensor 31A changes from the ON state to the OFF state (change from (A) to (B)).
t2 is a time measured by detecting the moment when the second oil position measurement sensor 31B changes from the ON state to the OFF state (change from (C) to (D)).

Then, the controller 32 calculates the actual oil level drop rate ΔL / ΔT per unit time at the oil level Lmax of the oil in the new oil state (S).
3). Further, the control device 32 controls the table 3 in FIG.
3, the liquid level drop rate per unit time ΔL /
The estimated deterioration time T0 corresponding to ΔT is read (S
4) The signal of the estimated deterioration time T0 is sent from the storage unit 32A to the calculation unit 32B.

On the other hand, the control device 32 measures the oil use time T which is the oil use time measured based on the time when the oil level is in the new oil state (S).
5). Then, the controller 32 controls the predicted deterioration time To
Is longer than the oil change reference time Ts (S
6). Here, the oil change reference time Ts is a fixed time from the time when the oil is in a new oil state, and is shown in FIG.

In S6, if the predicted deterioration time To is equal to or longer than the oil change reference time Ts, the process proceeds to S7 (FIGS. 9 and 1).
2, A, B and C), and if the predicted deterioration time To is shorter than the oil change reference time Ts, the process proceeds to S11 (FIGS. 9 and 12).
D, E). In S7, the controller 32 determines whether or not the oil use time T has reached the oil change reference time Ts.
Is determined by When the oil use time T reaches the oil change reference time Ts, the discharge pump 11 and the supply pump 8 are operated (S7, S8, S9).

The case B will be described. When the oil use time T reaches the oil change reference time Ts, the oil level is LB. At this point, the discharge pump 1
1 is activated. The oil remaining in the oil pan 3 is discharged by the discharge pump 11. Oil discharge is Q
max. Subsequently, the supply pump 8 is operated, and new oil in the supply tank 7 is supplied into the oil pan 3 by the supply pump 8. Oil supply amount is Vo + Qmax
It is. Here, Vo is the oil capacity from the oil level in the new oil state (highest oil level Lmax) to the oil level when the oil needs to be changed (lowest oil level Lmin). In this way, the oil in the oil pan 3 is replaced with a new one, and the oil level rises. In this way, the oil is restored to a new oil state, and returns to the initial state.

When the stationary engine 1 is used again, the oil level drops, and the above operation is repeated. In addition,
In the case of C, the oil deterioration limit is the oil change reference time Ts
Is the case. On the other hand, in S11, it is determined whether or not the oil use time T has reached the expected deterioration time To. When the oil use time T reaches the expected deterioration time To, the discharge pump 11 and the supply pump 8 are operated (S11, S8, S9).

The case of D will be described. When the oil usage time T reaches 280 hours (FIG. 9), the oil level becomes L
min. At this point, the oil in the oil pan 3 is discharged by the discharge pump 11. The oil discharge is Q1. Subsequently, the supply pump 8 is operated, and the new oil in the supply tank 7 is sent into the oil pan 3. The oil supply amount is Vo + Q1. In this way, the oil in the oil pan 3 is replaced with a new one,
The oil level rises, the oil returns to the new oil state, and returns to the initial state.

Again, the use of the stationary engine 1 lowers the oil level, and the above operation is repeated. According to the above-described configuration, the control device 32 measures the liquid level drop rate ΔL / ΔT per unit time of the oil and preliminarily associates the oil level drop rate ΔL / ΔT with the liquid level drop rate per unit time. The discharge pump 11 and the replenishment pump 8 are activated when the estimated deterioration time T0 has elapsed (when the oil use time T has reached the estimated deterioration time T0). It can be accurately grasped according to the degree of decrease. Accordingly, it is possible to prevent troubles in oil lubrication of the stationary engine 1 without delaying the timing of oil change, and to prevent adverse effects such as causing friction of the valve train due to deterioration of the oil.

As a result, for example, as shown in FIG.
In the stationary engine 1 with reduced oil consumption,
Since fresh oil in the supply tank 7 is always supplied into the oil pan 3, the oil pan 3 can always be filled with fresh oil having a small degree of deterioration. Further, using the stationary engine 1 with low oil consumption (in the case of A, B and C in FIGS. 9 and 12), when the oil usage time T has reached the oil replacement reference time Ts, the oil level is reduced. May not reach the minimum oil level Lmin (expected deterioration time To ≧ oil replacement reference time Ts). In this case,
When the oil use time T reaches the oil change reference time Ts, the oil can be changed. Therefore, the use of oil exceeding the deterioration limit after the oil change reference time elapses is prevented, and the oil lubrication of the stationary engine 1 is prevented. Can be prevented.

In the present embodiment, the oil level detecting sensor 31 is composed of a plurality of ON / OFF type oil position measuring sensors, but is not limited to this. For example, an ultrasonic sensor can be used. This ultrasonic sensor reflects the ultrasonic wave to the oil level, measures the time until the sound wave returns from the oil level, and measures the position of the oil level.

Further, in this embodiment, when the liquid level drop rate ΔL / ΔT per unit time of the oil is constant, the liquid level drop rate ΔL / ΔT per unit time in the table of FIG. The relationship with the time To has been set and described. However, as shown in FIG. 13, even when the liquid level drop rate ΔL / ΔT per unit time increases with the passage of time, the liquid level drop rate per unit time The relationship between ΔL / ΔT and the expected deterioration time To can be set.

Further, in the present embodiment, in the table 33 of FIG.
L / ΔT is exemplified by 7 degrees, 8 degrees, 9 degrees, 10 degrees, and 11 degrees, but is of course not limited to these numerical values. Further, as shown in FIG. 9, the relationship between the liquid level drop rate ΔL / ΔT per unit time and the expected deterioration time To is set, but the numerical value of the estimated deterioration time To is of course not limited to this. .

[0051]

According to the first aspect of the present invention, the degree of oil deterioration is constantly judged by the control device, and the oil deteriorated by the oil pan is constantly discharged by the control device, the discharge pump and the replenishment pump. And the fresh oil in the replenishing tank can always be supplied into the oil pan, so that the oil pan can always be filled with fresh oil that does not deteriorate.

As a result, the oil in the oil pan can be constantly refreshed without delaying the timing of oil change, preventing trouble in oil lubrication of the stationary engine, and causing, for example, friction of the valve train due to deterioration of the oil. And the like can be prevented. in short,
The control device constantly determines the degree of oil deterioration, replaces the oil with new oil before the oil deterioration progresses, and has the effect of avoiding poor oil lubrication of the stationary engine.

According to the second aspect of the present invention, the control unit controls the oil level drop rate per unit time ΔL / ΔT
At the time when the expected deterioration time T0 previously associated with the liquid level drop rate ΔL / ΔT per unit time elapses (when the oil use time T reaches the expected deterioration time T0), The operating pump and the replenishing pump are operated, so that the oil replacement time can be accurately grasped in accordance with the amount of oil in the oil pan. Therefore, it is possible to prevent the oil lubrication of the stationary engine from being hindered without delaying the timing of the oil change, and to prevent an adverse effect such as causing a friction of the valve train due to deterioration of the oil.

According to the third aspect of the present invention, when the oil use time T reaches the oil change reference time Ts, the oil is changed, so that the oil exceeding the deterioration limit after the elapse of the oil change reference time Ts. This has the effect of preventing the use of oil and preventing troubles in oil lubrication of the stationary engine.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an automatic oil supply device for a stationary engine according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a control system of the automatic oil supply device.

FIG. 3 is a flowchart of the automatic oil supply device.

FIG. 4 is an explanatory diagram of an effect of the automatic oil supply device.

FIG. 5 is an overall configuration diagram showing a modification of the automatic oil supply device.

FIG. 6 is an overall configuration diagram of an automatic oil supply device for a stationary engine according to the second and third embodiments of the invention.

FIG. 7 is an explanatory diagram of a control system of the automatic oil supply device.

FIG. 8 is a flowchart of the automatic oil supply device.

FIG. 9 is an explanatory diagram showing a table of a storage unit.

FIG. 10 is an explanatory diagram showing how to determine a liquid level falling rate per unit time ΔL / ΔT.

FIG. 11 is an explanatory diagram showing a comparison between an engine consuming less oil and an engine consuming more oil.

FIG. 12 is a graph showing a liquid level drop rate ΔL / ΔT, T per unit time.
(Oil use time), Ts (oil change reference time), T
It is explanatory drawing which shows the relationship of o (expected deterioration time).

FIG. 13: Oil level drop rate Δ per unit time of oil level
Oil level drop rate per unit time ΔL / Δ when L / ΔT increases over time
FIG. 4 is an explanatory diagram of a relationship between T and a predicted deterioration time To.

FIG. 14 is an explanatory diagram of a conventional automatic oil supply device for a stationary engine.

[Explanation of symbols]

 Reference Signs List 1 stationary engine 3 oil pan 5 oil deterioration detection sensor 7 replenishment tank 8 replenishment pump 10 discharge tank 11 discharge pump 12 control device 31 oil level detection sensor 31A first oil position measurement sensor 31B second oil position measurement Sensor 32 control device

Claims (3)

[Claims] A replenishing tank provided separately from an oil pan in the engine; a replenishing pump for supplying oil from the replenishing tank to the oil pan; a discharge tank communicating with the oil pan; A discharge pump for sending oil in an oil pan to a discharge tank; an oil deterioration sensor disposed in the oil pan for detecting a degree of oil deterioration; and a degree of oil deterioration detected by the oil deterioration sensor as a reference. A control device that activates the discharge pump and the supply pump when the value is equal to or more than the reference value, and stops the discharge pump and the supply pump when the degree of oil deterioration is less than the reference value. Automatic oil supply device for the engine. 2. A replenishing tank provided separately from an oil pan in the engine, a replenishing pump for feeding oil from the replenishing tank to the oil pan, a discharge tank communicating with the oil pan, A discharge pump that sends oil in the oil pan to a discharge tank; an oil level sensor that detects a position of an oil level of the oil in the oil pan; and a liquid per unit time of the oil in the oil pan. Calculate the surface descent rate ΔL / ΔT, and calculate the liquid level descent rate Δ per unit time.
The predicted deterioration time T related in advance corresponding to L / ΔT
And a control device for operating the discharge pump and the replenishment pump when the oil usage time T of the used oil from the time when the oil is in the new oil state reaches the expected deterioration time T0. An automatic oil supply device for a stationary engine, comprising: 3. The controller determines whether or not the estimated deterioration time To is equal to or longer than an oil change reference time Ts, which is a fixed time from when the oil is in a new oil state, and If the oil change reference time Ts or more, the oil use time T is equal to the oil change reference time T.
s, the discharge pump and the replenishment pump are operated, and if the predicted deterioration time To is less than the reference oil replacement time Ts, the oil use time T is reduced to the predicted deterioration time To.
3. The automatic oil supply device for a stationary engine according to claim 2, wherein the discharge pump and the replenishment pump are actuated when the pressure reaches a predetermined value.