JPH04246202A - Lubrication device for rotary piston engine - Google Patents

Abstract

PURPOSE:To eliminate seal, sliding noise effectively by outputting a command for compensation to increase lubricating oil feeding amount, when it is judged that a low speed and light weight operating conditions are continued for over a specified time. CONSTITUTION:A lubrication device for a rotary piston engine is provided with a lubricating oil feeding means 10 for feeding lubricating oil to a combustion chamber of the rotary piston engine and a lubricating oil feeding amount control means 21 in which a lubrication oil feeding amount from the lubricating oil feeding means 10 is set according to the operating condition of the rotary piston engine. Also a judgment means 22 in which whether or not the operating condition of the rotary piston engine is in low speed and light load zone for over a specified time is judged. In addition, a compensation means 23 in which, when it is judged by the judgment means 22 that a low speed and light load operating condition is continued for over a specified time, a command for compensation to increase the lubrication oil feeding amount to be set by the lubricating oil feeding amount control means 21 is outputted, is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating device for a rotary piston engine.

0002

[Prior Art] As disclosed in Japanese Patent Publication No. 60-50961, a lubricating device for a rotary piston engine supplies lubricating oil into the working chamber from a lubricating oil supply port formed in the rotor housing of the rotary piston engine. It has been proposed that lubricating oil can also be supplied from the intake passage under certain operating conditions. In the case of the known example, if lubricant is supplied only from the lubricant supply port formed in the rotor housing, the amount of lubricant adhering to the inner surface of the side housing tends to be insufficient compared to the inner surface of the rotor housing under certain operating conditions. This is an attempt to resolve the issue.

0003

By the way, when a rotary piston engine is operated for a long time at low rotation speed and light load, a phenomenon occurs in which carbon sludge adheres to the trochoid surface of the rotor housing. The generation of such carbon sludge causes abnormal noise (ie, seal sliding noise) when the apex seal and the rotor housing trochoidal surface come into sliding contact during rotor rotation.

[0004] In order to eliminate the above-mentioned seal sliding noise,
It is necessary to increase the amount of lubricating oil supplied into the combustion chamber of a rotary piston engine to improve the lubrication state between the rotor housing trochoid surface and the apex seal. However, if a method of constantly increasing the amount of lubricating oil supplied to the combustion chamber is adopted, a problem arises in that the amount of lubricating oil consumed increases.

The present invention has been made in view of the above points, and effectively eliminates seal sliding noise caused by carbon sludge adhering to the rotor housing trochoid surface without deteriorating lubricant consumption. The purpose is to

[0006]

[Means for Solving the Problems] In the invention of claim 1, as means for solving the above problems, there is provided a lubricating oil supply means for supplying lubricating oil to a combustion chamber of a rotary piston engine, and a lubricating oil supplying means for supplying lubricating oil to a combustion chamber of a rotary piston engine. A lubricating system for a rotary piston engine, which is equipped with a lubricating oil supply amount control means for setting a lubricating oil supply amount according to the operating state of the rotary piston engine, when the operating state of the rotary piston engine is at low rotation speed and light load for a predetermined period of time or more. A determination means for determining whether or not the vehicle is within the range;
A correction means is provided for outputting a command to increase the lubricant supply amount set by the lubricant supply amount control means when it is determined that the light load operating state continues.

In the invention of claim 2, as means for solving the above problem, there is provided a lubricating oil supply means for supplying lubricating oil to the combustion chamber of a rotary piston engine, and an amount of lubricating oil supplied from the lubricating oil supplying means. A lubrication system for a rotary piston engine comprising a lubricant supply amount control means that is set according to the operating state of the rotary piston engine, a knock sensor that detects vibrations of the rotary piston engine and outputs a signal in a predetermined frequency range; A determination means for determining whether or not the rotary piston engine is operating at low rotation speed and light load; and a signal output from the knock sensor; A correction means is provided for outputting a command to increase the lubricant supply amount set by the lubricant supply amount control means when it is determined.

[0008]

[Function] According to the invention of claim 1, the following effects can be obtained by the above-mentioned means.

That is, when a predetermined period of time has elapsed in the operating state of a rotary piston engine in a low-speed, light-load operating state, carbon sludge adheres to the trochoidal surface of the rotor housing of the rotary piston engine. Since the amount of lubricating oil supplied is to be corrected by increasing the amount, the increased lubricating oil improves the lubrication state between the trochoid surface and the apex seal.

[0010] In the invention of claim 2, the following effects can be obtained by the above means.

Specifically, there are cases where carbon sludge adheres to the trochoidal surface of the rotor housing of a rotary piston engine due to continued low-speed and light-load operation and causes sealing noise due to sliding contact with the apex seal; A signal output from the knock sensor is obtained when a knocking noise occurs during medium-to-high load operation, but the amount of lubricating oil supplied to the combustion chamber increases only when the operating condition is in the low rotation/light load range. Since it is to be corrected,
The increased amount of lubricating oil improves the lubrication state between the trochoid surface and the apex seal.

0012

According to the invention of claim 1, the lubricating oil supply means supplies lubricating oil to the combustion chamber of a rotary piston engine, and the amount of lubricating oil supplied from the lubricating oil supplying means is determined based on the operating state of the rotary piston engine. In a rotary piston engine lubrication system, the rotary piston engine lubrication system includes: a lubricating oil supply amount control means that sets the lubricating oil supply amount according to the determination means; If the determining means determines that the low rotation/light load operating state continues for a predetermined period of time or more, a command to increase the lubricating oil supply amount set by the lubricating oil supply amount controlling means is output. The rotary piston engine is equipped with a correction means to correct the operating condition of the rotary piston engine.
If carbon sludge is thought to have adhered to the rotor housing trochoid surface after a predetermined period of light load operation, the amount of lubricating oil supplied to the combustion chamber is increased. The lubricating oil improves the lubrication state between the trochoid surface and the apex seal, and has the excellent effect of preventing seal noise from occurring without increasing lubricating oil consumption.

According to the second aspect of the invention, the lubricating oil supply means supplies lubricating oil to the combustion chamber of the rotary piston engine, and the amount of lubricating oil supplied from the lubricating oil supplying means is adjusted according to the operating state of the rotary piston engine. A lubricating system for a rotary piston engine is equipped with a lubricating oil supply amount control means that is set according to If there is a signal output from the knock sensor and a determination means for determining whether or not the operation is under load, and the determination means determines that the operation is at low rotation speed and a light load, the lubrication A correction means for outputting a command to increase the lubricating oil supply amount set by the oil supply amount control means is attached, and when a signal output from the knock sensor is obtained and the operating state is low rotation.・The amount of lubricating oil supplied to the combustion chamber is increased only when the load is light, so the increased lubricating oil improves the lubrication state between the trochoid surface and the apex seal. By using the extremely effective method of using the existing knock sensor, it is possible to prevent the occurrence of seal noise without increasing the consumption of lubricating oil.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show a rotary piston engine lubricating device according to Embodiment 1 of the present invention.

As shown in FIG. 2, the rotary piston engine 1 of this embodiment includes a casing 2 consisting of a rotor housing 3 having a trochoidal surface 3a and side housings 4 disposed on both sides of the rotor housing 3. Inside the casing 2 is a substantially triangular rotor 5 whose top portion is connected to the trochoidal surface 3 of the rotor housing 3.
It is arranged so as to be in sliding contact with a.

The rotor 5 is supported by an eccentric shaft 6, as is well known, and apex seals 7 are disposed at each top of the eccentric shaft 6, and the apex seals 7 are in sliding contact with the trochoidal surface 3a of the rotor housing 3.

The rotor housing 3 has a lubricating oil supply port 9 for supplying lubricating oil to the combustion chamber 8.
The lubricating oil supply port 9 has a lubricating oil supply passage 1 from an oil pump 10 acting as a lubricating oil supply means.
1 is connected.

The oil pump 10 includes a motor section 10a consisting of a pulse motor, and a pump section 10b driven by the motor section 10a.

[0020]The oil pump 10 of this embodiment has its discharge amount controlled by the control unit 20 based on data such as the rotational speed Ne of the rotary piston engine 1 and the intake air amount Qa which is a reference for load determination. It is supposed to happen. Note that the engine speed Ne is detected by a crank angle sensor (not shown), and the intake air amount Qa is
Detected by an air flow meter (not shown).

The control unit 20 is composed of, for example, a microcomputer, and as shown in FIG. a lubricating oil supply amount control means 21 that sets the lubricating oil supply amount according to the specified time; a determination means 22 that determines whether the operating state of the rotary piston engine 1 has been in the low rotation/light load region for a predetermined time or more; If it is determined that the low rotation/light load operating state has continued, the correction means 23 outputs a command to increase the lubricant supply amount set by the lubricant supply amount control means 21. It has become a thing.

Next, the flow of control by the control unit 20 of this embodiment will be explained with reference to the flowchart shown in FIG.

Simultaneously with the start of control, engine speed Ne, intake air amount Qa, etc. are input in step S1, and in steps S2 and S3, engine speed N is input.
Determination of whether e is less than a predetermined value Ne0 (i.e., whether it is in a low rotation region) and whether or not the intake air amount Qa is less than a predetermined value Qa0 (i.e., whether it is in a light load region or not). ) is determined. Here, if it is determined that the operating state of the rotary piston engine 1 is low rotation and light load, the control by the control unit 20 proceeds to step S4, and waits for the low rotation and light load operation to continue for a predetermined time. ,
In step S5, the correction means 23 increases the lubricant supply amount set by the lubricant supply amount control means 21. Thereafter, the lubricating oil supply amount that has been corrected to increase according to a command from the lubricating oil supply amount control means 21 is adjusted to the oil pump 1.
The lubricating oil is discharged from the lubricating oil supply port 9 to the combustion chamber 8 of the rotary piston engine 1 . In the case of this embodiment, the lubricating oil supply from the oil pump 10 is continued for a predetermined period of time, but after that, normal lubricating oil supply amount control according to the operating state of the rotary piston engine 1 is resumed. (steps S6 and S7).

Note that in steps S2 and S3,
If it is determined that the operating state of the rotary piston engine 1 is not low rotation/light load operation, the control unit 2
The control based on 0 proceeds to step S7, where normal lubricant supply amount control according to the operating state of the rotary piston engine 1 is performed.

As described above, according to this embodiment, if carbon sludge adheres to the rotor housing trochoidal surface 3a after a predetermined period of time has elapsed in the operating state of the rotary piston engine 1 in a low-speed, light-load operating state, If this is possible, the amount of lubricating oil supplied to the combustion chamber 8 is corrected by increasing the amount, so the increased lubricating oil improves the lubrication state between the trochoid surface 3a and the apex seal 7, resulting in improved lubrication. without increasing oil consumption.
This makes it possible to prevent seal sliding noise from occurring.

Embodiment 2 FIGS. 4 and 5 show a rotary piston engine lubricating device according to Embodiment 2 of the present invention.

In the case of this embodiment, on the outer peripheral surface of the rotor housing 3 of the rotary piston engine 1 in the first embodiment,
As shown in FIG. 5, a knock sensor 12 is attached. The knock sensor 12 detects engine vibration that occurs when the rotary piston engine 1 knocks and outputs a signal, and has an operating characteristic that outputs a signal in a specific frequency range (i.e., around 8 kHz). show.

Note that carbon sludge adheres to the trochoidal surface 3a of the rotor housing 3, and the apex seal 7
The seal sliding sound generated during sliding contact with the knock sensor 12 also falls within the operating frequency range of the knock sensor 12.

However, it is well known that knocking of the rotary piston engine 1 occurs during medium to high load operation, whereas carbon sludge adhesion to the rotor housing trochoid surface 3a occurs only during low rotation and light load operation. There is.

Therefore, in this embodiment, the knock sensor 1
The discharge amount is controlled by the control unit 30 based on data such as the output signal from the rotary piston engine 2, the rotational speed Ne of the rotary piston engine 1, and the intake air amount Qa which is a reference for load determination.

The control unit 30 is composed of, for example, a microcomputer, and as shown in FIG. There was a lubricating oil supply amount control means 31 that sets the amount according to the engine speed, a determination means 32 that determines whether the rotary piston engine 1 is being operated at low rotation speed and light load, and a signal output from the knock sensor 12. and when the determining means 32 determines that the operating state is low rotation and light load, the lubricating oil supply amount control means 31 outputs a command to increase the lubricating oil supply amount set by the lubricating oil supply amount control means 31. It is also used as means 33.

Next, the flow of control by the control unit 30 of this embodiment will be explained with reference to the flowchart shown in FIG.

Simultaneously with the start of control, the engine speed Ne, intake air amount Qa, etc. are input in step S1, and the presence or absence of an output signal from the knock sensor 12 is determined in step S2. Here, if there is an output signal from the knock sensor 12, the control by the control unit 30 proceeds to step S3, and determines whether the engine rotation speed Ne is below a predetermined value Ne0 (that is, whether it is in the low rotation region or not). ) is determined. Here, if it is determined that the operating state of the rotary piston engine 1 is in the low rotation region, the control by the control unit 30 proceeds to step S4, and determines whether the intake air amount Qa is less than or equal to the predetermined value Qa0 (i.e. , whether or not the load is in the light load region). Here, if it is determined that the operating state of the rotary piston engine 1 is in the light load region, the control by the control unit 30 proceeds to step S5, and the lubricant oil set by the lubricant supply amount control means 31 is set by the correction means 33. The supply amount is corrected to increase. Thereafter, the lubricating oil supply amount corrected to increase according to a command from the lubricating oil supply amount control means 31 is discharged from the oil pump 10 and is supplied to the combustion chamber 8 of the rotary piston engine 1 from the lubricating oil supply port 9.

Note that if it is determined in step S2 that there is no signal output from the knock sensor 12, or even if there is a signal output from the knock sensor 12, the operating state of the rotary piston engine 1 is determined in steps S3 and S4. If it is determined that the operation is not a low rotation/light load operation, control by the control unit 30 proceeds to step S6, and normal lubricant supply amount control according to the operating state of the rotary piston engine 1 is performed.

As described above, according to this embodiment, when the signal output from the knock sensor 12 is obtained,
Since the amount of lubricating oil supplied to the combustion chamber 8 is increased only when the operating state of the rotary piston engine 1 is in the low rotation/light load range, the increased amount of lubricating oil is used to increase the amount of lubricating oil that is applied to the rotor housing trochoidal surface. 3a and the apex seal 7, and by using the extremely effective means of using the existing knock sensor 12, the generation of seal sliding noise can be suppressed without increasing lubricant consumption. This can be prevented.

It goes without saying that the present invention is not limited to the configurations of the embodiments described above, and that the design can be modified as appropriate without departing from the gist of the invention.

[Brief explanation of the drawing]

FIG. 1 is a functional diagram of a control unit in a rotary piston engine lubricating device according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a lubricating device for a rotary piston engine according to a first embodiment of the present invention.

FIG. 3 is a flowchart showing the control flow of the control unit in the rotary piston engine lubricating device according to the first embodiment of the present invention.

FIG. 4 is a functional diagram of a control unit in a rotary piston engine lubricating device according to a second embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of a lubricating device for a rotary piston engine according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing the control flow of the control unit in the rotary piston engine lubricating device according to the second embodiment of the present invention.

[Explanation of symbols]

1 is a rotary piston engine, 3 is a rotor housing, 3a is a trochoid surface, 8 is a combustion chamber, 10 is a lubricating oil supply means (oil pump), 12 is a knock sensor, 20,
30 is a control unit, 21 and 31 are lubricating oil supply amount control means, 22 and 32 are determination means, and 23 and 33 are correction means.

Claims (2)

[Claims] 1. Lubricating oil supply means for supplying lubricating oil to a combustion chamber of a rotary piston engine, and a lubricating oil supply amount in which the amount of lubricating oil supplied from the lubricating oil supply means is set according to the operating state of the rotary piston engine. A lubricating device for a rotary piston engine, comprising a control means, the rotary piston engine is in a low rotational speed state for a predetermined period of time or more.
a determination means for determining whether or not the load was in the light load region; and a lubrication control means set by the lubricant supply amount control means when the determination means determines that the low rotation/light load operating state has continued for a predetermined time or more. A lubricating device for a rotary piston engine, characterized in that it is further equipped with a correction means for outputting a command to increase the amount of oil supplied. 2. Lubricating oil supply means for supplying lubricating oil to the combustion chamber of a rotary piston engine, and a lubricating oil supply amount in which the amount of lubricating oil supplied from the lubricating oil supply means is set according to the operating state of the rotary piston engine. A lubricating device for a rotary piston engine, comprising: a knock sensor that detects vibrations of the rotary piston engine and outputs a signal in a predetermined frequency range; This is a case where there is a signal output from the knock sensor and a signal output from the knock sensor, and the determination means determines whether the
A rotary piston characterized in that the rotary piston is further equipped with a correction means for outputting a command to increase and correct the lubricant supply amount set by the lubricant supply amount control means when it is determined that the operating state is a light load operation state. Engine lubrication system.