JP2016109005A - Engine lubrication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine lubrication device including a water separation device for separating a water content by storing high-temperature oil heated by a turbosupercharger in an engine including the turbosupercharger.SOLUTION: The engine lubrication device includes: an engine body 1; an oil pump for circulating oil for lubricating the engine body 1; a turbosupercharger 85 compressing intake air to the engine body 1 by receiving an exhaust gas from the engine body 1 and lubricated by the oil supplied by the oil pump; and a water separation device 7 for storing the oil on a downstream side of the turbosupercharger 85 in an oil passage 6 to separate the water content from the stored oil.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an engine lubrication device.

  Patent Document 1 listed below discloses a technique for increasing the temperature of oil by introducing return oil (return oil) lubricated with a turbocharger (T / C) into an inner oil pan of two oil pans. Is disclosed.

  By the way, the oil that lubricates the engine and the turbocharger is mixed with water generated by the combustion of the fuel, and the mixed water dilutes the oil, thereby causing a phenomenon that the lubricating performance of the oil is lowered.

JP 2014-005768 A

  In recent years, in order to reduce harmful components in exhaust gas, development of engines using hydrogen gas as fuel has been advanced. However, in an engine using hydrogen gas as fuel, a large amount of moisture is generated by the combustion of hydrogen gas, so the amount of moisture mixed into the oil also increases. As a result, since the dilution ratio of the oil is higher than that of an engine using gasoline and light oil as a fuel, there is a problem that the lubricating performance of the oil is further lowered.

  The present invention has been made in view of such points, and an object of the present invention is to perform water separation in an engine equipped with a turbocharger to store high-temperature oil heated by the turbocharger and separate moisture. An object of the present invention is to provide an engine lubrication device equipped with a device for use.

  In order to solve the above-mentioned problems, the present invention is characterized in that the water mixed in the oil is separated by storing the high-temperature return oil after lubricating the turbocharger.

  Specifically, the present invention is directed to an engine lubrication device and has taken the following solutions.

  That is, the first invention is an engine main body, an oil pump that circulates oil for lubricating the engine main body, an exhaust from the engine main body, compresses intake air to the engine main body, and is supplied by the oil pump A turbocharger lubricated with oil and a water separation device that stores oil on the downstream side of the turbocharger in the oil path and separates water from the stored oil are provided.

  According to this, heat generated in the bearing portion of the turbocharger and the exhaust gas transmitted to the turbocharger housing by the water separation device provided on the downstream side of the turbocharger in the oil path for engine lubrication Hot oil heated by the heat of the gas can be stored, and moisture mixed in the oil can be easily vaporized and separated by the hot oil. The vaporized water-containing gas can be processed by returning to the intake system through a discharge path connected to the intake system path, for example.

  In a second aspect based on the first aspect, the water separation device has a storage tank for storing oil, and the storage tank is provided with a heat retaining device for retaining the oil, and the retained oil is supplied to the engine. It is circulated in the main body.

  According to this, for example, when used in an environment where the engine main body does not operate continuously, the temperature of the oil is suppressed to decrease the viscosity of the oil, and the resistance of the engine rotation at the time of restart is reduced. Can be planned.

  According to a third aspect, in the second aspect, the apparatus further includes a drive motor that drives the vehicle, a power storage device that stores electrical energy that drives the drive motor, and a generator that generates electric power from the engine body. The machine supplies power to the power storage device or the drive motor, and the heat retaining device has a heater that heats oil supplied from the power storage device and stored in the storage tank.

  According to this, even in a so-called series type hybrid vehicle (HV), when the engine body is not operated, the temperature of the oil can be suppressed by operating the heater by supplying power from the power storage device.

  In a fourth aspect based on the third aspect, the heater is controlled by a charging rate in the power storage device.

  According to this, since the heater which comprises a heat retention apparatus is controlled by the charge rate (SOC: value of ratio with respect to charge capacity of charge remaining amount) in an electrical storage apparatus, the charge rate of an electrical storage apparatus is more than predetermined amount, for example When the temperature is low, the heater operation can be stopped, so that the load of the heater on the power storage device can be reduced.

  In a fifth aspect based on the second to fourth aspects, the heat retaining device has a heat retaining material for retaining the temperature of the storage tank.

  According to this, oil can be kept warm with a simple configuration in which the storage tank is kept warm by the heat insulating material.

  In a sixth aspect of the present invention, in the second to fifth aspects of the invention, the engine body has an oil pan for storing oil in a lower portion thereof, and the storage tank is partitioned by a partition plate in part of the oil pan. The remaining part of the oil pan is configured so that oil can be circulated.

  According to this, since it is not necessary to provide a separate storage tank, space saving can be achieved.

  In a seventh aspect based on the sixth aspect, the partition plate is provided with a partition valve, and the partition valve is controlled by the rotational speed and load in the engine body.

  According to this, for example, when at least one of the rotational speed and load of the engine body is higher than a predetermined value, the temperature of the oil quickly rises. Therefore, by opening the partition valve provided on the partition plate, the oil Can be used for lubrication and cooling.

  According to an eighth invention, in the first to seventh inventions, the engine body burns at least hydrogen gas as fuel.

  According to this, when hydrogen gas is used as fuel, even if water generated by the combustion of the hydrogen gas is mixed into the oil, the water can be easily separated by the water separation device having a simple configuration. .

  According to the present invention, in an engine provided with a turbocharger, water mixed in the oil can be separated by storing high-temperature oil heated by the turbocharger.

FIG. 1 is a schematic configuration diagram including a rotary piston engine and a lubricating device for the engine according to the first embodiment. FIG. 2 is a schematic configuration diagram including a rotary piston engine and a lubricating device for the engine according to the second embodiment. FIG. 3 is a schematic control flow diagram of the water separation device constituting the engine lubrication device according to the second embodiment. FIG. 4 is a graph obtained by measuring the relationship between the temperature of the engine oil and the thermal efficiency using the water separation device constituting the lubricating device of the engine of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the invention, its application, or its application.

(First embodiment)
FIG. 1 schematically shows a system configuration including a rotary piston engine and a lubricating device for the engine according to the first embodiment.

  As shown in FIG. 1, in this embodiment, a rotary piston engine (hereinafter referred to as an engine main body) 1 is, for example, a twin rotor type (two-cylinder configuration), and a rotor housing 11 on the primary side is on the left side. The rotor housing 11 on the secondary side is shown expanded to the right so as to be symmetrical with each other.

  Explaining only the primary side, a substantially triangular rotor 12 is accommodated in a rotor accommodating chamber 11a formed in a bowl-shaped rotor housing 11 in the engine body 1. The primary and secondary two rotor housings 11 are sandwiched between three side housings (not shown) and integrated with the side housings. A rotor accommodating chamber 11a is formed. An eccentric shaft 13 is disposed at the center of the rotor housing 11.

  The rotor 12 is provided with apex seals (not shown) at the apexes of the triangles, and these apex seals are in sliding contact with the inner surface of the trochoid of the rotor housing 11. As a result, the rotor 12 defines three working chambers (corresponding to combustion chambers) in the rotor accommodating chamber 11a (cylinder). The rotor 12 revolves around the axis of the eccentric shaft 13 while rotating around the eccentric shaft 13 with the three apex seals of the rotor 12 in contact with the inner peripheral surface of the trochoid of the rotor housing 11. . While the rotor 12 makes one revolution, the working chambers formed between the tops of the rotor 12 move in the circumferential direction, and the intake, compression, expansion (combustion), and exhaust strokes are performed. The rotating force is output from the eccentric shaft 13 as the output shaft through the rotor 12.

  An intake passage 14 is connected to the rotor accommodating chamber 11a so as to communicate with an intake port 11b that opens to the working chamber in the intake stroke, and communicates with an exhaust port 11c that opens to the working chamber in the exhaust stroke. An exhaust passage 15 is connected to the front. There is one intake passage 14 on the upstream side, but on the downstream side, the intake passage 14 branches into two branch passages and communicates with the respective rotor accommodating chambers 11a. A throttle valve 16 that is driven by a throttle valve actuator 90 such as a stepping motor to adjust the cross-sectional area (valve opening degree) of the intake passage 14 is disposed upstream of the branch portion of the intake passage 14. The throttle valve 16 adjusts the amount of intake air into the rotor accommodating chamber 11a.

  Each branch passage downstream of the branch portion of the intake passage 14 is provided with a port injection valve 17 (only the secondary side is shown) that injects fuel gas, for example, hydrogen gas into the intake passage 14. . The hydrogen gas injected by the port injection valve 17 is mixed with air and supplied to the working chamber in the intake stroke. The rotor housing 11 includes a direct injection valve 18 (only the primary side is shown) that directly injects the supplied hydrogen gas into the working chamber in the compression stroke of the rotor accommodating chamber 11a, and a port injection valve 17 or direct injection. Two spark plugs 19 (shown only on the secondary side) for igniting the hydrogen gas injected from the valve 18 are provided. Note that one or both of the port injection valve 17 and the direct injection valve 18 can be appropriately used depending on the load of the engine body 1.

  Two exhaust passages 15 are provided on the upstream side so as to communicate with the respective rotor storage chambers 11a, but are joined together on the downstream side. A catalyst 81 and a catalyst 82 for purifying exhaust gas are disposed on the downstream side of the joining portion of the exhaust passage 15. In FIG. 1, the arrows shown in the intake passage 14 and the exhaust passage 15 indicate the flow of intake and exhaust, respectively.

  The turbocharger 85 is disposed downstream of the merging portion in the exhaust passage 15 and upstream of the catalyst 81 and the compressor 85a disposed upstream of the throttle valve 16 in the intake passage 14. And a turbine 85b. The turbine 85b rotates by the exhaust flow, and the rotation of the turbine 85b activates the compressor 85a that is coaxially connected to the turbine 85b to compress the air taken into the intake passage 14. The compressed air is cooled by an intercooler 86 disposed downstream of the compressor 85 a in the intake passage 14. An air cleaner 70 is disposed upstream of the compressor 85a.

  Further, the turbocharger 85 that becomes high temperature during operation is connected to an oil supply pipe 6 for lubricating and cooling the bearing with oil (engine oil). The oil supply pipe 6 has an upstream end provided in the engine body 1, and a downstream end of the oil supply pipe 6 via the bearing of the turbocharger 85 and a storage tank 7 that stores oil as a water separation device. It is connected to the pan 11d.

  A heater 8 is disposed inside the storage tank 7. The heater 8 is an example of a heat retaining device. Although not shown, a heat insulating material made of ceramic or resin may be attached to at least a part of the inner wall surface including the upper surface and the bottom surface of the storage tank 7.

  The interior of the storage tank 7 is not filled with high-temperature oil that has passed through the turbocharger 85, that is, a space for confining a gas containing water vapor that has evaporated water mixed in the high-temperature oil is located above the storage tank 7. Configured to be formed. The space may be provided with a so-called labyrinth structure in which a gas containing oil and moisture collides to promote condensation of the oil.

  A water separation pipe 9 for mixing water (water vapor) separated from the oil component into blow-by gas is disposed at the upper portion of the storage tank 7. The blow-by gas taken out from the rotor storage chamber 11a is returned to the intake passage 14.

  Here, the storage tank 7, the heater 8, and the water separation pipe 9 are an example of a configuration of a water separation device for oil.

  In the present embodiment, the eccentric shaft 13 of the engine body 1 is connected to the generator 2, and the generator 2 is operated by the engine body 1.

  The generator 2 is connected via an inverter 3 to a drive motor 4 that drives the axle and a battery (power storage device) 5 that stores electrical energy that operates the drive motor 4. The generator 2 can appropriately supply power to the battery 5 or the drive motor 4 in accordance with the charging rate (SOC) of the battery 5, the number of revolutions in the engine body 1 and its load.

-Effect-
For example, in a power generation engine that uses hydrogen gas as a fuel and includes a turbocharger, hydrogen has a higher oil dilution ratio due to moisture than gasoline and light oil during combustion. Therefore, the engine lubrication device according to the present embodiment includes a storage tank that constitutes a water separation device that stores high-temperature oil heated by the turbocharger and separates the water, so that the oil lubrication performance Can be prevented. In addition, the storage tank is provided with a heat insulating material and a heater, and the temperature of the oil stored in the storage tank can be maintained by appropriately operating the heater when the engine is started or stopped. It becomes.

(Second Embodiment)
In the second embodiment, the storage tank constituting the water separation device is not made independent from the engine body as in the first embodiment, but a part of the oil pan in the engine body is used as the storage tank. About another structure, it is the structure similar to 1st Embodiment, and in the following description, about the component similar to the component which concerns on 1st Embodiment, it demonstrates using the same code | symbol.

  FIG. 2 schematically shows a system configuration including a rotary piston engine and a lubrication device for the engine according to the second embodiment.

  As shown in FIG. 2, the engine lubrication apparatus according to the present embodiment has an oil storage tank 71 that constitutes a water separator, and a part of an oil pan 11d of the engine body 1, for example, about half of the total volume is partitioned. It is configured to be partitioned by a plate 71a. An oil pan valve (partition valve) 72a that allows oil to flow between the storage tank 71 and the oil pan 11d is provided below the partition plate 71a. In the upper part of the partition plate 71a, excess oil is stored in the storage tank 71 so that the return oil from the turbocharger 85 is not filled, that is, a space is formed in the upper part of the storage tank 71. A flow 71b that flows from 71 to the oil pan 11d is provided. The space may be provided with a so-called labyrinth structure in which a gas containing oil and moisture collides to promote condensation of the oil.

  The bottom end of the storage tank 71 is connected to the downstream end of the oil supply pipe 6 that distributes the oil that has passed through the bearing of the turbocharger 85. Furthermore, a distribution pipe 61 connected to the oil pump 73 is connected to the bottom surface of the storage tank 71 via the suction port distribution valve 72b, and a suction port distribution is connected to the bottom surface of the oil pan 11d excluding the storage tank 71. A flow pipe 61b connected to the oil pump 73 is connected via a valve 72b. The oil pump 73 may be a mechanical oil pump or an electric oil pump. Here, an electric oil pump that is easy to control is used.

  A heater 8 is disposed inside the storage tank 71. Although not shown, a heat insulating material made of ceramic or resin may be attached to at least a part of the inner wall surface including the upper surface and the bottom surface of the storage tank 71.

-Control method of water separator-
FIG. 3 shows a schematic control flow of a water separator constituting the engine lubrication device according to the present embodiment.

  As shown in FIG. 3, in step ST10, the oil temperature of the engine body 1, the engine speed (load), and the state of charge of the battery 5 are detected by a predetermined oil temperature sensor, engine speed sensor, and current voltage sensor. judge. Here, four control methods are mainly described.

  First, if it is determined to be true in step ST11 for determining a high load at an oil temperature of 90 ° C. or higher or an engine speed of 2500 rpm or higher, the heater 8 is turned off in step ST21. Thereby, the oil temperature is maintained by the operation of the engine body 1 and the heat insulating material provided in the storage tank 71. At this time, the suction port distribution valve 72b increases the flow rate from the remaining portion of the oil pan 11d in accordance with the engine speed. Thereby, it is possible to prevent a sudden drop in the oil temperature due to mixing of oil lower than the temperature of the oil in the storage tank 71 from the remaining part of the oil pan 11d. When the oil temperature is 120 ° C. or higher, the oil pan valve 72a is opened and the entire amount of oil is used. Thereby, cooling of oil is promoted. In addition, when the engine main body 1 stops from this state, the oil pan valve 72a is closed to keep the oil in the storage tank 71 provided with the heat insulating material.

  Next, in step ST22, when it is determined that the oil temperature is less than 90 ° C., the engine speed is less than 2500 rpm, and the charging rate (SOC) of the battery 5 is 40% or more. The heater 8 is turned on. Further, the oil pan valve 72a is closed, and the suction port distribution valve 72b allows only the oil from the storage tank 71 to flow. The target value of the oil temperature at this time is, for example, 90 ° C to 100 ° C. Thus, since the heater 8 is operated and only the oil in the storage tank 71 is used for lubrication and cooling, an increase in the oil temperature is promoted. As a result, it is possible to reduce the sliding resistance between metals in the components constituting the engine main body 1 and the turbocharger 85, and to reduce the sliding resistance of the gas seal attached to the rotary piston 12. It is possible to prevent a decrease in thermal efficiency at low temperatures.

  Next, when it is determined to be true in step ST13 for determining when the oil temperature is less than 90 ° C., the engine speed is less than 2500 rpm, and the charging rate (SOC) of the battery 5 is 35% or more and less than 40%, In step ST23, the heater 8 is intermittently turned on. The target value of the oil temperature at this time is, for example, 70 ° C. to 80 ° C., and the length of the heater 8 in the on state and the length of the off state, and the ratio of the lengths are arbitrary as long as the target temperature is satisfied. Can be set. Further, the oil pan valve 72a is closed, and the suction port distribution valve 72b allows only the oil from the storage tank 71 to flow. Thus, even when the charging rate of the battery 5 is low, the oil temperature can be prevented from drastically decreasing by operating the heater 8 intermittently.

  When the charging rate (SOC) of the battery 5 is less than 35%, it is necessary to store the electric energy of the battery 5 for traveling of the vehicle (for electrical equipment), so the heater 8 is turned off, The oil pan valve 72a is closed, and the oil temperature is raised by storing the high-temperature return oil from the turbocharger 85 to the storage tank 71 with a heat retaining material when the engine body 1 is started.

  Next, when it is determined to be true in step ST14 for determining when the vehicle is connected to the external charger, the heater 8 is turned on in step ST24. Further, the oil pan valve 72a is closed, and the suction port distribution valve 72b allows only the oil from the storage tank 71 to flow. The target value of the oil temperature at this time is, for example, 100 ° C to 105 ° C, or 100 ° C to 110 ° C. The operation of the heater 8 at this time may be performed by an external power source. In this manner, the heater 8 is operated, and only the oil in the storage tank 71 is used for lubrication and cooling, so that an increase in the oil temperature is promoted. Thereby, when the battery 5 is charged by the external charger, it is possible to prevent various reductions in thermal efficiency when the oil is at a low temperature even if the vehicle is driven immediately after the completion of charging.

  Further, when the driver (operator) leaves the vehicle, the time at which driving is resumed may be set with a timer. For example, the heater 8 is operated only when the charging rate (SOC) of the battery 5 is 40% or more or at the time of charging, and the oil temperature is maintained at, for example, 90 ° C. to 100 ° C. in advance when the operation is resumed. You may make it do. Further, when it is not during charging, the heater 8 may be operated from, for example, 30 minutes before the restart of operation set in the timer.

  FIG. 4 shows a graph in which the relationship between engine oil temperature and thermal efficiency is measured with an actual machine. FIG. 4 shows the relationship between the temperature of the engine oil at the outlet of the oil pan 11d and the thermal efficiency of the engine, and the vertical axis is an arbitrary unit (au). The battery 5 is a lithium ion battery, and the charging rate of the ion battery is 20% to 90%. A heat insulating material is provided inside the storage tank 71. As shown in FIG. 4, it can be seen that if the oil temperature is about 95 ° C. or higher, the thermal efficiency of the engine does not change.

-Effect-
As described above, according to the present embodiment, the same effect as that of the first embodiment can be obtained, and the storage tank 71 that stores the high-temperature return oil from the turbocharger 85 is disposed inside the normal oil pan 11d. Since a partition is provided, the space for separately providing the storage tank 71 can be saved. Further, a partition valve 72a is provided on the partition plate 71a of the storage tank 71, and the oil from the storage tank 71 and the oil from the remaining part of the oil pan 11d are respectively provided between the oil pan 11d and the oil pump 73. Therefore, the oil volume and the oil temperature can be adjusted at the same time and appropriately.

  The present invention is not limited to the above-described embodiment, and can be substituted without departing from the scope of the claims.

  For example, in each of the embodiments described above, the engine body 1 is a hydrogen rotary engine using hydrogen gas as a fuel, but may be a reciprocating engine using hydrogen gas as a fuel, and a gas other than hydrogen gas (for example, Further, a rotary engine or a reciprocating engine using natural gas (CNG) as fuel may be used.

  In each of the above embodiments, the engine body 1 and the lubrication device are mounted on a series-type hybrid vehicle (range extender EV vehicle). However, the present invention is not limited to this, and any other device including an engine and a vehicle drive motor is provided. It can also be mounted on a hybrid vehicle of such a type, or can be mounted on a vehicle driven only by an engine.

  INDUSTRIAL APPLICABILITY The engine lubrication apparatus according to the present invention can be applied to an application or the like where it is desired to separate water mixed in engine oil in an engine equipped with a turbocharger.

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Generator 3 Inverter 4 Drive motor 5 Battery (power storage device)
6 Oil supply pipe (oil route)
7 Storage tank (water separation device)
71 Storage tank (water separation device)
71a Partition plate 72a Oil pan valve (partition valve)
72b Suction distribution valve 73 Oil pump 8 Heater (heat insulation device)
9 Water separation pipe 11 Rotor housing 11d Oil pan 13 Eccentric shaft 85 Turbocharger 85a Compressor 85b Turbine

Claims (8)

The engine body,
An oil pump for circulating oil for lubricating the engine body;
A turbocharger that receives exhaust from the engine body, compresses intake air to the engine body, and is lubricated by oil supplied by the oil pump;
An engine lubrication apparatus comprising: a water separation device that stores oil on a downstream side of the turbocharger in an oil path and separates water from the stored oil. In claim 1,
The water separation device has a storage tank for storing oil,
An engine lubrication device, wherein the storage tank is provided with a heat retaining device that retains oil, and the retained oil is circulated through the engine body. In claim 2,
A drive motor for driving the vehicle;
A power storage device for storing electrical energy for driving the drive motor;
A generator for generating electricity by the engine body,
The generator supplies power to the power storage device or the drive motor,
The engine heat-retaining device includes a heater that heats oil supplied from the power storage device and stored in the storage tank. In claim 3,
The engine lubrication device is characterized in that the heater is controlled by a charging rate in the power storage device. In any one of Claims 2-4,
The engine heat-retaining device includes a heat-retaining material that retains the temperature of the storage tank. In any one of Claims 2-5,
The engine body has an oil pan for storing oil in a lower part thereof,
The storage tank is configured so that a part of the oil pan is partitioned by a partition plate, and the remaining portion of the oil pan is configured to allow oil to flow therethrough. In claim 6,
The partition plate is provided with a partition valve,
The engine lubrication device, wherein the partition valve is controlled by a rotational speed and a load in the engine body. In any one of Claims 1-7,
The engine main body burns at least hydrogen gas as a fuel.

Images