JPH0543046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a device for measuring lubricating oil consumption of an internal combustion engine.

"Conventional technology" A conventional measuring device will be explained.

As shown in FIG. 2, the conventional measuring device is equipped with a metering oil tank 101 connected to an oil pan 301 of the engine through a connecting pipe 201, and in this metering oil tank 101, the oil level C is the same as the lubricating oil level AB of the oil pan 301. The overflow pipe 401 is connected to the position of
is in open communication with the measuring oil tank 501 placed on the scale 601, and the metering oil tank 101 and the metering oil tank 501 are connected from the metering oil tank 501 to the metering oil tank 1.
A pump circuit 701 equipped with an oil pump 801 connects the oil pump 801 so as to supply oil, and a lubricating oil circulation circuit is formed between the oil pan 301 and the measuring oil tank 501, and the weight of the measuring oil tank is measured to perform lubrication. Measure oil consumption. Before measurement, put an appropriate amount of oil into the oil gauge tank 501.

"Problems to be Solved by the Invention" However, such conventional devices had the following problems. Oil pan 301 and metered oil tank 101
are communicated with each other through a communication pipe 201, and are connected to a fixed quantity oil tank 101.
Since it is a measuring device that applies atmospheric pressure to
The oil level on the lubricating oil level AB of the oil pan 301 changes due to pressure fluctuations in the crankcase, and
It is difficult to maintain the oil level C of the oil pan 301 and the oil level AB of the oil pan 301 at constant oil levels, making it impossible to accurately measure the amount of lubricating oil consumed.

(a) When the crankcase pressure is high, the oil level AB in the oil pan will be lower than the oil level C in the metered oil tank 101.

(b) When the crankcase pressure is low, the oil level AB will be higher than the oil level C in the metered oil tank 101. In order to solve this problem, it is an object of the present invention to provide a measuring device that maintains the lubricating oil level in the oil pan at a constant oil level regardless of the internal pressure of the crankcase, and that can easily measure lubricating oil consumption extremely accurately. is to provide.

"Means for Solving the Problem" In order to achieve the above object, the measuring device of the present invention extracts lubricating oil from an oil pan and sends it to a measuring tank that already contains a predetermined amount of lubricating oil. The lubricating oil is returned to the engine from the measuring tank, and a portion of the oil in the oil pan and tank is constantly circulated. A bypass is formed in the middle of the return pipe via a return amount adjustment valve, so that the capacity of the extraction pump is always greater than that of the return pump. Furthermore, the other ends of the two pipes connected to the return pipes before and after the bypass are placed in an auxiliary tank.

``Function'' In such a device, the lubricating oil in the oil pan is forcibly extracted by the extraction pump through the extraction pipe 5, so that it is not affected by the crankcase pressure.

Also, since a bypass is provided in the middle of the return pipe via a return amount adjustment valve, the capacity of the extraction pump can be made larger than that of the return pump, so the oil level can be kept in equilibrium at the tip of the extraction pipe. .

By providing an auxiliary tank, the consumed amount of lubricating oil can be replenished.

"Example" Below, a preferred embodiment of the lubricating oil consumption measuring device according to the present invention will be described with reference to the drawings. 2 indicates an internal combustion engine, and an oil pan 3 indicates lubricating oil in the oil pan. Then, lubricating oil is extracted from the oil pan 2 by a extraction pump 6 through a extraction pipe 5 having a tip 4 and sent to a measurement tank 7. A predetermined amount of lubricating oil 8 is placed in the measuring tank in advance, and the lubricating oil is also returned from the measuring tank 7 to the oil pan 2 from the drain hole 11 of the internal combustion engine 1 via the return pipe 9 and the return pump 10. ing. The valve 12 is for adjusting the amount of return. In order to maintain the capacity (extraction amount) of the extraction pump 6 higher than the capacity (return amount) of the return pump 10, the lubricating oil that has passed through the valve 12 is transferred to the return pipe 10 near the inlet of the return pump 10 via a bypass pipe 13. Returned by

With the above structure, the oil level in the oil pan 3 is kept balanced at the tip 4 of the extraction tube 5 as described above. As the lubricating oil is consumed, the oil level tends to drop, so the lubricating oil is replenished from the measuring tank 7 into the oil pan 2 through the drain hole 11, and the oil level is at the tip of the extraction pipe 5. Maintain equilibrium at 4. If the weight of the measuring tank is measured with the load converter 14 while the engine is running, and the decrease in the weight of the measuring tank is measured, this decrease is the lubricating oil consumption, so it can be measured very easily with this device. can do. In this device, the lubricating oil consumption can be measured and displayed moment by moment with high precision on the digital printer 18 via the digital display 16 and/or the arithmetic processor 17 via the amplifier 15 of the output of the load converter 14. It is something. It is also possible to measure and display on the analog display 19 via the amplifier 15 if necessary. Since lubricating oil is consumed during engine operation, it is necessary to newly replenish the consumed amount into the oil pan 2. In this device, an auxiliary tank 20 is provided separately and a return pump 1 is provided.
Auxiliary supply pipe 2 is connected to the return pipe 9 between 0 and the measurement tank 7.
1 are connected via a three-way valve 22.

When newly replenishing lubricating oil, switch the three-way valve 22 to stop the oil from being sucked up from the measuring tank 7, and the oil is sucked up from the auxiliary tank 20 via the replenishment supply pipe 21, and the oil is newly added to the oil pan 2. will be replenished. The newly replenished lubricating oil is newly replenished into the measuring tank via the extraction pipe 5, and when the three-way valve 22 is returned to its original position when the predetermined amount reaches the oil level shown by the dotted line, the lubricating oil is returned to the measuring tank. 7 through a return pipe 9.

If the amount of new replenishment is larger than the predetermined amount, it can be returned to the auxiliary tank 20 through the surplus return pipe 24 via the three-way valve 23 in the return pipe 9 between the return pump 10 and the drain hole 11. In this case, the three-way valve 23
By switching the lubricating oil to the drain hole 11
The return to is stopped. In the above embodiment, the three-way valves 22, 23 are used for new replenishment and surplus return, but in some cases, the three-way valves 22, 23
ON-OFF of solenoid valve etc. as an alternative to
The valves are connected to the auxiliary supply pipe 21, the excess return pipe 24, the measurement tank 7 side of the return pipe 9, and the drain hole 11.
It can be installed on the side.

"Effect of the invention" According to the present invention, the following effects can be obtained.

First, the tip of the extraction pipe is opened into the oil pan, and lubricating oil is directly and forcibly extracted from the oil pan into the measurement tank using a pump, so it is independent of the crankcase internal pressure. The lubricating oil level in the oil pan is maintained at the height of the tip opening of the extraction tube, and there is no fluctuation in the lubricating oil level in the oil pan, making extremely accurate measurement possible. Furthermore, since a bypass is provided before and after the return pump via the return amount adjusting valve 12, the extraction capacity of the extraction pump can always be maintained greater than the return capacity of the return pump.
Furthermore, by connecting the auxiliary supply pipes and surplus return pipes installed before and after the bypass pipe to the auxiliary tank, it is possible to replenish the measuring tank with new lubricating oil or return surplus oil from the measuring tank to the auxiliary tank. can. To measure the amount of movement, such as the rise and fall of the oil level in the measurement tank, a sensor such as a high/low level switch linked to a float is installed instead of a load detector, and the sensor detects the amount of movement, and this is sent as an electrical signal. When the input signal exceeds or falls below a predetermined input signal, a solenoid valve is activated to control the flow rate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a lubricant consumption measuring device according to an embodiment of the present invention. FIG. 2 is a block diagram relating to the conventional measurement of lubricant consumption. Explanation of symbols, 1... Internal combustion engine, 2... Oil pan, 3... Lubricating oil in the oil pan, 4... Tip of extraction tube, 5... Extraction tube, 6... Extraction pump, 7... Measuring tank, 8...Lubricating oil at the bottom of the measuring tank, 9...Return pipe, 10...Return pump,
11...Return position to the engine, 12...Return amount control valve, 13...Bypass pipe, 14...Load converter,
15...Amplifier, 16...Digital display, 20
... Auxiliary tank, 21 ... Auxiliary supply pipe, 22,2
3...3-way valve, 24...excess return pipe.

Claims (1)

[Claims] 1. A lubricating oil circulation circuit is provided between an oil pan of an internal combustion engine and a lubricating oil consumption measuring tank, and the oil level in the oil pan is kept constant and the weight of the measuring tank is measured. In a lubricating oil consumption measuring device for measuring lubricating oil consumption, (a) a extraction pipe 5 opening into the oil pan 2 of the internal combustion engine 1 and a extraction pump 6 provided in the extraction pipe 5; means for extracting lubricating oil from the oil pan 2 and supplying it to the measuring tank 7 through a return pump 10 having a flow capacity smaller than the flow capacity of the extracting pump 6; (c) means for keeping the level of the lubricating oil in the oil pan 2 constant at the lower end open position of the extraction pipe 5 by operating the return pump 10; (d) Means for forming a bypass in the middle of the return pipe 9 to the oil pan 2 in the lubricating oil circulation circuit via a return amount adjustment valve 12. A lubricating oil consumption measuring device characterized by comprising the above means (a), (b), (c), and (d). 2. The lubricating oil consumption measuring device according to claim 1, wherein an auxiliary tank 20 is connected to the return pipe 9 between the return pump 10 and the measurement tank 7 via an auxiliary supply pipe 21. 3. Claim 1 or 2, in which the auxiliary tank 20 is connected to the return pipe 9 between the return pump 10 and the return position to the internal combustion engine 1 via the surplus return pipe 24.
A device for measuring lubricating oil consumption as described in Section 1.