JPS6211162B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention improves lubricating oil consumption in a rotary piston engine that limits fuel supply during deceleration. The present invention relates to a lubricating oil supply device that can prevent contamination of sensors and sensors.

(Prior art) In order to lubricate the rotor that rotates planetarily within the casing and the inner wall surface of the casing, a rotary piston engine has a system that supplies lubricating oil to the working chamber separately from the main lubrication system that circulates through the engine body. It has a road.

This lubricating oil is generally supplied in an amount equal to the amount of oil required for lubrication within the casing plus the amount of oil burned within the working chamber.

However, in a rotary piston engine that is configured to limit fuel during deceleration, when fuel is limited during deceleration, the amount of lubricant burned in the working chamber decreases, so an excess amount of lubrication is generated in the working chamber. This means that oil is being supplied.

When such excess lubricating oil is exhausted through the exhaust passage, the phosphorus component contained in the lubricating oil reacts with the catalyst to form a glass-like film on the catalyst.
It may impede the catalytic action and contaminate sensors installed in the exhaust passage.

Conventionally, there is a removal device that removes phosphorus components by placing an adsorbent in the middle of the lubrication system to prevent contamination of catalysts and sensors.
6018).

However, if this type of device is applied to a rotary piston engine where the fuel supply is restricted during deceleration, it can prevent the catalyst and sensors from becoming contaminated, but as mentioned above, excess lubricating oil will be supplied during deceleration. There is a problem that the consumption of lubricating oil is not improved.

(Object of the Invention) The present invention has been made in view of the above points, and in a rotary piston engine where fuel supply is restricted during deceleration, the amount of lubricating oil is reduced during deceleration to supply excess lubricating oil into the working chamber. An object of the present invention is to provide a lubricating oil supply device for a rotary piston engine, which is capable of improving lubricating oil consumption without reducing the fuel consumption, and prevents contamination of catalysts and sensors provided in an exhaust passage.

(Structure of the Invention) The present invention provides a rotary piston engine in which the supply of fuel to the working chamber is restricted during deceleration, in which lubricating oil is supplied to the working chamber when the supply of fuel to the working chamber is restricted. This is a lubricating oil supply device for a rotary piston engine equipped with a lubricating oil reducing device that reduces the amount of lubricating oil.

(Example) Hereinafter, the configuration of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a rotary piston engine, which has means for restricting fuel supply during deceleration. Meanwhile, fuel is injected into the working chamber 2 from an injector 4 provided in an intake passage 3, and lubricating oil 5 is also supplied.

The lubricating oil 5 is pulled up from inside the oil pan 7 via the oil pump 6, and the required amount of lubricating oil according to the engine rotation and load is divided into two flow paths 9 and 10 by the metering oil pump 8. be done.

One flow path 9 is connected via a solenoid valve 11 to a first oil supply nozzle 12 provided on the outlet side of the intake passage 3, and lubricating oil is injected from the first oil supply nozzle 12 into the working chamber 2. Supplied. Further, the other flow path 10 is also connected to a second oil supply nozzle 15 provided through the rotor housing 14 through a solenoid valve 13, and lubricating oil is injected into the working chamber 2 through the second oil supply nozzle 15. Ru.

The lubricating oil injected from the first oil supply nozzle 12 is mainly applied to the inner surface 18 of the rotor housing 14 and the side seal 1 provided along the outer circumference of the rotor 16.
The lubricating oil injected from the second oil supply nozzle 15 mainly contributes to the lubrication of the apex seal 19 and the inner surface 18 of the rotor housing 14.

By the way, the second oil supply nozzle 15 is located in the working chamber 2.
Since the lubricating oil is opened inward, the lubricating oil may scatter due to the influence of the pressure inside the working chamber 2. When the apex seal 19 is located directly below the second oil supply nozzle 15 during normal engine operation, The above-mentioned second
Preferably, a refueling nozzle 15 is provided.

In the figure, 20 is an ignition plug, 21 is an intake port, 22 is an exhaust passage, and 23 is an eccentric shaft.

Next, a description will be given of a lubricating oil reducing device when the supply of fuel to the working chamber 2 is restricted during deceleration.

In FIG. 2, the control circuit 24 receives a signal S1 corresponding to the intake flow rate detected from the air flow sensor 25 (see FIG. 1) via the potentiometer 26, and a signal S2 from the engine speed sensor 27. , a signal S3 from the engine coolant temperature sensor 28, and a signal S4 corresponding to the opening of the throttle valve 30 (see FIG. 1) detected via the throttle valve opening switch 29. . The optimum fuel injection amount is calculated from the signals S1 and S2 via the basic injection amount determination circuit 31, and is converted into a pulse wave corresponding to the calculated amount and output. The output pulse wave controls the fuel injection amount of the injector 4 via the injector drive circuit 32.

On the other hand, the signals S2, S3, and S4 are used to detect deceleration, determine the region (indicated by diagonal lines in FIG. 3) in which lubricating oil is to be reduced, and
1 and 13.

That is, when the signal S2 exceeds the reference voltage V1 and the engine speed exceeds the set rotation speed N1 (see Figure 3), the output of the comparator 33 becomes "1" level, and the signal S3 exceeds the reference voltage V2. The engine coolant temperature is set at T1 (see Figure 3).
At this point, the output of the comparator 34 becomes "1" level, so the signal S4 causes the slot valve 30 to
When it is confirmed that the gate is fully closed, the output of the AND gate 35 becomes "1" level. When the output of the AND gate 35 reaches the "1" level, the solenoid valve drive circuit 36 operates and the solenoid valves 11, 13
The excitation coils 11a and 13a are excited to operate the control valves 11b and 13b (see FIG. 1).

When the control valves 11b and 13b are operated, the flow paths 9 and 10 are narrowed, and the amount of lubricating oil supplied into the working chamber 2 is reduced.

Note that the set rotation speed N1 is set so that the engine rotation speed is higher than the idle rotation speed, and is set at a value that allows the engine to be sufficiently warmed up at the set coolant temperature T1, so that engine stoppage, etc. does not occur. The setting value is selected such that there is no such setting.

In the embodiment described above, the solenoid valves 11 and 13 are controlled by the output of the control circuit 24, but the discharge amount of the metering oil pump 8 may also be controlled.

(Effects of the Invention) The present invention provides a rotary piston engine in which the supply of fuel is restricted during deceleration, and is provided with a lubricating oil reducing device that reduces the amount of lubricating oil supplied into the working chamber when the fuel is restricted. Even during deceleration, the amount of lubricating oil required for lubrication inside the casing can be supplied, and excess lubricating oil is not supplied, so lubricating oil consumption can be improved, and as a result, the amount of lubricating oil components exhausted, that is, phosphorus components, is also reduced. Therefore, it is possible to prevent the catalyst and sensors provided in the exhaust passage from being contaminated.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; Fig. 1 is a system diagram showing a lubricating oil supply device for a rotary piston engine, Fig. 2 is a block diagram explaining the operation of a control circuit, and Fig. 3 is a system diagram showing a lubricating oil supply device for a rotary piston engine. It is a figure showing a decreasing area. 1... Rotary piston engine, 2... Working chamber, 5... Lubricating oil, 11... Solenoid valve,
12...First oil supply nozzle, 13...Solenoid valve, 15...Second oil supply nozzle, 24...Control circuit.

Claims (1)

[Claims] 1. In a rotary piston engine that supplies lubricating oil to the working chamber while restricting the supply of fuel to the working chamber during deceleration, when the supply of fuel to the working chamber is restricted, A lubricating oil supply device for a rotary piston engine, comprising a lubricating oil reducing device for reducing the amount of lubricating oil supplied to the rotary piston engine.