GB2084667A

GB2084667A - Oil cleaning system

Info

Publication number: GB2084667A
Application number: GB8128957A
Authority: GB
Original assignee: HURNER ERWIN EDWARD
Current assignee: HURNER ERWIN EDWARD
Priority date: 1980-09-29
Filing date: 1981-09-24
Publication date: 1982-04-15
Also published as: FR2491127B1; FR2491127A1; MX153733A; CA1167778A; DE3138144A1; GB2084667B; BR8106246A

Abstract

A system, designed for use with a diesel engine in over-the-road trucks, periodically extracts a given quantity of oil from the oil pan 56 of the engine and injects that quantity into the fuel tank for burning along with the regular fuel. In turn, an automatic oil level sensing device 70 keeps the proper level of oil in the pan thus ensuring a constant infusion of fresh oil into the engine's oil supply as well as a periodic purging of old oil. <IMAGE>

Description

SPECIFICATION Oil cleaning and recycling system In the field of over-the-road trucking, it is highly desirable to be able to minimize the amount of service required on a vehicle in order that that vehicle be available for use on the road. The changing of oil and corresponding filter accounts for a substantial portion of the maintenance which will be performed on an over-the-road truck during its lifetime. Further, the service life of a diesel is directly related to the cleanliness of the oil run in the engine.

It is an object of this invention to provide a system which enables the amount of maintenance time required in changing the oil on an over-the-road truck and which makes it possible for the oil to remain substantiaily clean and effective.

The present invention provides an oil recycling system for use with diesel engines having a fuel tank, a lubrication system and an oil pan, the system comprising: means for generating a periodic signal; and means responsive to said signal for withdrawing a predetermined amount of oil from said oil pan and transporting said amount into said fuel tank.

The system may include means for maintaining a predetermined oil level in said oil pan. The level maintaining means may comprise means for sensing whether the oil in said pan is at said predetermined level, and may further comprise time delay means connected to said sensing means so that oil will be added to said oil pan only when said oil level has fallen below said predetermined level for a predetermined period of time. Oil may be directed into the oil pan from an oil reservoir which is desirably pressurized, for example by the air reservoir which is present on most over-the-road trucks as part of the braking system.

The signal generating means may comprise an impulse timer energized by the vehicle ignition circuit. In this case, the withdrawing means may comprise a solenoid valve energized by said impulse timer; and a pump having an inlet connected to said oil pan and an outlet connected to said fuel tank, said pump being operated by said solenoid valve.

The existing air reservoir of the vehicle may serve to actuate the oil extractor pump by way of a solenoid valve which is attached to the impulse timer.

A system constructed in accordance with the invention will now be described with reference to the accompanying drawing (Figure 1) which is a schematic diagram of the system.

The inventive oil recycling system, generally 10, is shown in Figure 1.An impulse timer 12 is connected to a power source 14. The power source 14 is the equivalent of the ignition system in a key-operated vehicle and thus source 14 and similarly impulse timer 12 are activated only when the engine 16 of the truck is running. Impulse timer 12 is set to produce a short (approximately seven seconds) impulse of power periodically through lead 18 to solenoid valves 20, 22 and 24. The input side of first solenoid valve 20 is connected by line 26 to an air reservoir 28.

The output of first solenoid valve 20 is connected via line 32 to air/oil cylinder 34. Valve 20 is a three-way valve and in the non-energized position connects output line 32 to vent 30 and thus vents the air side 38 of cylinder 34 and allows piston 36 and cylinder 34 to assume the position shown in Figure 1. When solenoid valve 20 is energized, lines 26 and 32 are connected thereby pressurizing the air chamber 38 of cylinder 34 and forcing piston 36 towards the right of cylinder 34. Second solenoid valve 22 is normally open in its non-energized state and connects a source of engine pressurized oil 40 to the input of solenoid valve 22. This source of pressurized oil 40 may be the output from the oil filter on the engine.

The output 42 of solenoid valve 22 is connected to T-fitting 44 which is connected on one side via conduit 46 to the oil chamber 48 of air/oil cylinder 34.

The third solenoid valve 24 is of the normally closed type and the input 50 of valve 24 is connected to the remaining branch of T-fitting 44. The output 52 of third valve 24 is connected to the fuel return line 54 or may be routed directly to the fuel tanks if so desired.

Engine 16 generally has an oil pan 56. Shown in phantom on oil pan 56 are the desired oil level 58 and the dangerously low level 60. The desired level 58 is that level at which it is desired to maintain the oil level in the engine. The dangerously low level 60 is that level at which, if reached, operation of the vehicle should immediately cease until the oil has been brought to a proper level. A sensor 62 is located in oil pan 56 at the dangerously low level 60.

This sensor is then connected to an indicator lamp 64 on the instrument panel 66 which will serve to instruct the operator to immediately shut the engine down. The normal dipstick in the engine is replaced by a dipstick sensor 68, wherein the dipstick is formed of a spiral wound material with a hollow core leaving room for a wire to run downward to the sensor 70 located at the bottom thereof. This use of the dipstick as an oil sensor allows very precise location of the desired level 58 in the engine. Such location which is formed by comparing dipstick 68 to the regular dipstick removed from the engine while giving much more accurate level 58 as opposed to attempting to drill pan 56 for a sensor similar to sensor 62. Sensor 70 is connected to time delay unit 72 by means of leads 74. Time delay unit 72 activates sensor70 approximately two minutes after engine 16 has been shut off.This allows time for oil in the engine to drain back to pan 56 thereby allowing a true reading of the level to be obtained. After this two-minute interval, sensor 70 is activated for approximately seven minutes thereby allowing sensor 70 to sense whether the level in the pan 56 has fallen below desired level 58. If the actual level is below the desired level 58, delay unit 72 activates by means of leads 76 solenoid valve 78. The intake line 80 of valve 78 is connected to an oil reservoir 82 containing pressurized oil therein. The output line 84 of valve 78 leads to the valve cover or other portion of engine 16 wherein fresh oil may be added. Of course, when oil has come back up to desired level 58, sensor 70 will detect that condition and through the time delay unit 72 shut off solenoid valve 78.Sensor 70 is activated for approximately seven minutes in the desired embodiment after the two-minute delay so as to allow sufficient time for the oil level to be brought back up to desired level 58 yet not have power running to sensor 70 at all times.

Briefly, oil reservoir 82 is pressurized by air reservoir 28. Line 86 leads from air reservoir 28 to air valve 88 which is a three-way type having a vent 90 and an output 92. Valve 88 is connected via output 92 to bracket 94 which is fixed to oil reservoir 82 as shown.

Oil reservoir 82 may be a generally cylindrical tank as shown, and due to the pressurization as will be more fully described hereinafter, may be located anywhere where there is space about the vehicle.

The output line 92 of valve 88 is attached to a bracket 94 which is in turn attached to the top of reservoir 82.

Aflexible yet pressure resistant hose 96 connects line 92 to quick-disconnect fitting 98 of the type commonly used for air tool and the like which is in turn attached to elbow 100 which leads into reservoir 82. This air line upon opening of valve 88 serves to pressurize reservoir 82. Flexible hose 96 is fastened to the top of a filler cap 104 which is secured by a cam-loc fitting 102 of the type well known in the art.

The length of hose 96 is such that lid 104 may not be removed from reservoir 82 without fitting 98 being disconnected. This serves to restrain lid 104.

Operation ofthe system When the vehicle is started, power source 14 is energized along with impulse timer 12. After a predetermined period of time, impulse timer 12 energizes solenoid valves 20, 22, and 24. At that time, valve 22 closes and valves 20 and 24 are opened thereby allowing the air from air reservoir 28 to pass through lines 26 and 32 and into air chamber 38 of cylinder 34. Thence, piston 36 is pressed to the right of Figure 1 thereby forcing the oil in oil chamber 48 through passage 46, junction 44, line 50 and 52 to the fuel return line 54.After approximately seven seconds of being energized, impulse timer 12 shuts off thereby opening valve 22, closing valve 24 and causing valve 20 to move to the vent position whereby the pressurized oil from the system forces piston 36 to the position shown in Figure 1 and air in air chamber 38 in line 32 are vented through vent 30 to the atmosphere. Thus, this portion of the system is ready for the next cycle.

Everytime the engine is turned off, after a delay of approximately two minutes in which time the oil has a chance to drain back into oil pan 56, time delay unit 74 activates dip stick sensor 70. If sensor 70 senses the presence of oil atthe desired level 58, nothing further happens. Should sensor 70 not detect oil, delay unit 72 activates and opens solenoid valve 78, thereby allowing oil to flow from oil reservoir 82 through lines 80 and 84 and into engine 16. This continues until sensor 70 detects the presence of oil at which time solenoid valve 78 is shut off.

Air reservoir 28 is the conventional reservoir present on most over-the-road trucks for pressurization of brakes and the like. When it is desired to fill oil reservoir 82, valve 88 is turned to the vent position wherein the air pressurizing reservoir 82 is vented through vent 90 to the atmosphere. Then, quickdisconnect fitting 98 is uncoupled and cam-loc fitting 102 unlatched allowing removal of lid 104 for refilling of reservoir 82. It is to be noted that fitting 98 must be disconnected before lid 104 may be removed from the reservoir for filling by insuring that lid 104 will not be blown off reservoir 82 if reservoir 82 is pressurized.

In the preferred embodiment, impulse timer 12 is set to activate air/oil cylinder 34 once for every eight minutes of engine operation, that is, for every eight minutes that power source 14 is activated. For each cycle of cylinder 34, approximately .8 ounces of oil is extracted from the oil pan and delivered to the fuel tank 54. If the truck averages 35 miles per hour of operation, this system will result in an effective complete change of oil every 9,000 miles with a truck having a 10-gallon oil capacity. The use of such a system allows the operator to control precisely the amount of impurities and solids suspended in the oil merely by changing the interval on which the impulse timer 12 operates. By continually injecting new oil into the engine, the additive package present in oils is maintained at a desirably high level and at an average level higher than that which will result from the normal change-type cycle. Further, by burning used oil along with the conventional diesel fuel, the full heat value of the used oil is extracted and no costly recycling of that oil is necessary. In summary, the instant invention allows near maintenance-free operation of the oil system of the truck with only a very occasional check on the reservoir to make sure that it is up to the desired level.

Claims

1. An oil recycling system for use with diesel engines having a fuel tank, a lubrication system and an oil pan, the system comprising: means for generating a periodic signal; means responsive to said signal for withdrawing a predetermined amount of oil from said oil pan and transporting said amount into said fuel tank; and means for maintaining a predetermined oil level in said oil pan.

2. The oil recycling system of claim 1 wherein said level maintaining means comprises means for sensing whether the oil in said pan is at said predetermined level.

3. The oil recycling system of claim 2 wherein said sensing means is mounted on the dipstick of the engine.

4. The oil recycling system of claim 2 wherein said level maintaining means further comprises time delay means connected to said sensing means so that oil will be added to said oil pan only when said oil level has fallen below said predetermined level for a predetermined period of time.

5. The oil recycling system of claim 4, said level containing means further comprising an oil reservoir responsive to said sensing means.

6. The oil recycling system of claim Swherein said oil reservoir is pressurized.

7. The oil recycling system of claim 6, said system further comprising a valve, said valve comprising: an inlet connectable to a source of pressurized air; an outlet connected to said oil reservoir; a vent to the atmosphere; an open position connecting said inlet and said outlet; and a closed position connecting said outlet and said vent.

8. The oil recycling system of claim 7, said system further comprising: conduit means connecting said valve outlet and said oil reservoir; filing means on said oil reservoir; and detachable fitting means connecting said conduit means and said oil reservoir, said conduit means being attached to said filling means and of such a length as to prevent removal of said filling means without detaching said fitting means.

9. An oil recycling system for use with diesel engines having a fuel tank, a lubrication system and an oil pan, the system comprising: means for generating a periodic signal; and means responsive to said signal for withdrawing a predetermined amount of oil from said oil pan and transporting said amount into said fuel tank.

10. The oil recycling system of claim 1 wherein said signal generating means comprises an impulse timer energized by the vehicle ignition circuit.

11. The oil recycling system of claim 10 wherein said withdrawing means comprises: a solenoid valve energized by said impulse timer; and a pump having an inlet connected to said oil pan and an outlet connected to said fuel tank, said pump being operated by said solenoid valve.

12. The oil recycling system of claim 10 further comprising means responsive to said impulse timer for pumping oil from said lubrication system to said fuel tank.

13. The oil recycling system of claim 12 said pumping means comprising: a pump cylinder having an air side and an oil side; a normally open first valve having an inlet and an outlet, said first valve inlet being connected to said lubrication system and said first valve outlet being connected to said cylinder oil side; a normally closed second valve having an inlet and an outlet, said second valve inlet being connected to said cylinder oil side and said second valve outlet being connected to said fuel tank; and a third valve comprising an inlet, an outlet, and a vent, said third valve having first and second positions, said first position connecting said third valve outlet and said third valve vent and said second position connecting said third valve inlet and said third valve outlet, said third valve inlet being connected to a source of pressurized air and said third valve outlet being connected to said cylinder air side, said third valve being normally in said first position.

14. The oil recycling system of claim 13 wherein said valves are responsive to said timer.

15. An oil recycling system substantially as described herein with reference to and as shown in the accompanying drawing.