JPS6160968B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection supply method for a rotary engine.

A polygonal rotor eccentrically rolls within a casing constituted by a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, with its top portion sliding along the trochoidal inner circumferential surface, In a rotary engine, a plurality of working chambers are defined by each side of the polygonal rotor, the trochoidal inner peripheral surface, and the side housing, and an intake port and an exhaust port are opened on the inner surface of the casing. using the fuel injection valve,
It is conventionally known that fuel is injected and supplied by the fuel injection valve.

However, in the above-mentioned type of rotary engine, the ratio between the minimum required amount of fuel at low load and the maximum required amount of fuel at high load is larger than that of a reciprocating engine. When a fuel injection valve is installed to inject and supply fuel, the value of the ratio cannot be set as large as required by the rotary engine, and the appropriate amount of fuel cannot be injected and supplied in all operating ranges. .

In addition, in a four-cycle reciprocating engine, fuel injection only needs to be performed once every two revolutions of the output shaft, so the fuel injector is given the necessary rest period after the end of fuel injection while the output shaft makes two revolutions. In other words, the fuel injection period is controlled to control the fuel injection amount, and fuel can be injected during the entire intake stroke, but in the above-mentioned type of rotary engine, the output shaft rotates once. Since fuel injection must be carried out once per cycle, the fuel injector must be allowed a minimum period of rest during the intake stroke of one working chamber, so that during the entire intake stroke Fuel injection cannot be performed. Therefore, in the case of a rotary engine, even if fuel injection valves of the same capacity are used, there is a disadvantage that the maximum fuel injection amount per fuel injection valve is smaller than that of a four-cycloreciprocating engine.

In view of the above-mentioned problems, two fuel injection valves are provided for one rotor, and these two fuel injection valves are operated alternately during each intake stroke of each working chamber. A fuel supply device configured to alternately inject fuel into the chambers and thereby supply a large amount of fuel to each working chamber has already been devised.
This is shown in Publication No.-39056.

However, even in the above-described fuel supply system, when the rotary engine is operated under high load and high speed, the amount of fuel supplied to each working chamber may be insufficient.

In addition, two fuel injection valves are provided for one rotor, and in the operating range where the required amount of fuel can be injected with one fuel injection valve, only one of the injection valves is operated to perform fuel injection, and one fuel injection valve is operated. In an operating range where one injection valve cannot inject and supply the required amount of fuel, it has been considered to operate two injection valves to inject and supply fuel.

In this case, the amount of fuel supplied to each working chamber will not be insufficient even during high-load, high-speed operation; There is a drawback that the transition to the operation range where fuel is injected and supplied using a fuel injection valve and vice versa is not smooth, and when fuel is supplied using two fuel injection valves, one operation is not possible. When fuel is supplied to the chamber, there are four nonlinear fuel injection amount unstable regions between the fuel injection start period and the fuel injection end period of the fuel injection valve, which deteriorates the control accuracy of the actual fuel injection amount.

The present invention uses two fuel injection valves for one rotor, and controls the fuel injection timing of each of the two fuel injection valves individually to inject an appropriate amount of fuel into each working chamber over all operating ranges. The purpose of the present invention is to provide a new fuel injection supply method that can supply fuel by injection.

This purpose is to provide a fuel injection supply method for a rotary engine as described above, in which two fuel injection valves are provided for one rotor, and the two fuel injection valves are operated alternately during each intake stroke of each working chamber. ,
The two fuel injection valves inject fuel alternately, and the fuel injection period of each fuel injection valve is extended until the fuel injected from the fuel injection valve is supplied to two successive working chambers. This is achieved by a rotary engine fuel injection supply method.

According to the fuel injection method of the present invention, two fuel injection valves are actuated alternately to perform fuel injection, so each fuel injection valve starts fuel injection every other time during the intake stroke of each working chamber. If possible, one fuel injector can be activated while the other fuel injectors are deactivated, so that each of the fuel injectors is activated during the entire intake stroke of one working chamber. Moreover, during high-load operation, the fuel injection period of each fuel injector is extended until the fuel injected from the fuel injector is supplied to two successive working chambers, so that one operation Fuel is now injected into the chamber from two fuel injection valves, and as a result, the minimum fuel injection amount and maximum fuel injection amount can be adjusted without impairing the transition between the increase and decrease processes of the fuel amount. It is possible to increase the ratio value to nearly twice that when using a single fuel injection valve, and the ratio value can be set to the value required by the engine, and it can be used for all operations of the rotary engine. This makes it possible to inject and supply an appropriate amount of fuel over the area.

Even if fuel is injected and supplied from two fuel injection valves to one working chamber during high-load operation, in the fuel injection supply method according to the present invention, one fuel injection valve is injected from the previous working chamber. Subsequently, fuel injection is performed, and the other fuel injection valve injects fuel to the next working chamber, so when supplying fuel to one working chamber, the fuel injection start period and fuel injection end period of the fuel injection valve are different. There are no two or more nonlinear fuel injection amount unstable regions during the period, and the control accuracy of the actual fuel injection amount does not deteriorate as a result.

Furthermore, when the fuel injection supply method according to the present invention is applied to a multi-cylinder rotary engine, the fuel injection valves may be operated simultaneously to inject fuel into each cylinder of the rotary engine at the same time.
This prevents the fuel injection valve control device from becoming complicated in a multi-cylinder rotary engine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

The attached FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a rotary engine in which the fuel injection supply method according to the present invention is implemented, and FIG. 2 is a plan cross-sectional view thereof as well. In these figures, reference numeral 10 denotes a rotor housing having a trochoidal inner circumferential surface 11, and a polygonal rotor 14 is disposed at the top of the casing, which has both ends closed by side housings 12 and 13. The abex seal 15 provided on the side portion is adapted to eccentrically roll around an eccentric shaft 16 while sliding along the trochoidal inner circumferential surface 11. The trochoidal inner peripheral surface 11 and the side housings 12 and 13
and each arcuate section of said rotor 14 define three working chambers A, B, C therebetween. A side intake port 1 is provided at one of the short axis portions of the trochoid on the trochoidal inner circumferential surface 11 of the rotor housing 10 at a position on the advancing side of the portion in the rotor rotational direction.
7 and 18 are provided facing each other, and a peripheral exhaust port 19 is provided at a position on the lag side in the rotor rotational direction of the short axis of the trochoid. Further, a spark plug 20 is provided on the other trochoid short axis portion of the trochoidal inner circumferential surface 11 of the rotor housing 10 .

Air is supplied to the side intake ports 17 and 18 from the air cleaner 21, respectively, and an intake air amount sensor 22,
The air is supplied through a throttle valve 23 and an intake manifold 24. The intake manifold 24 has branch pipe portions 24a, 24b connected to each of the side intake ports 17, 18, and fuel injection valves 25, 26 are attached to each of the branch pipe portions 24a, 24b. ing. These two fuel injection valves 25 and 26 operate based on injection signals generated by an electronic control unit 27, and are adapted to inject gasoline fuel toward the side intake ports 17 and 18, respectively. In this case, as shown in the graph of FIG. 3, the two fuel injection valves 25 and 26 are operated alternately during each intake stroke of each working chamber to inject fuel alternately. The electronic control unit 27 generates an injection signal with a predetermined pulse width in a well-known manner based on the intake air amount signal generated by the intake air sensor 22 and the engine rotation speed signal generated by the engine rotation speed sensor 28. This injection signal is alternately output to the fuel injection valves 25 and 26. The fuel injection period of the fuel injection valves 25, 26 is determined by the pulse width of the injection signal, which is extended as the engine load increases.

Since the fuel injection valves 25 and 26 inject fuel alternately, for example, when the fuel injection valve 25 injects fuel into the working chamber A, the fuel injection valve 26 injects the next fuel into the working chamber B, and The next fuel injection to the working chamber C is carried out by the fuel injection valve 25.
Therefore, the fuel injection valve 25 is connected to the fuel injection valve 25.
6 is in operation, and the fuel injection valve 26 can be given the necessary rest period while the fuel injection valve 25 is in operation, ie during the next intake stroke of the working chamber. Therefore, the operating period of each fuel injection valve is
It can be extended so that the fuel injected from the fuel injection valve is supplied throughout the entire intake stroke of one working chamber, and furthermore, during high load operation, it can be extended as shown by the imaginary line in Fig. 3. Thus, the fuel injected from the fuel injection valve is extended until it is supplied to the next working chamber. Therefore, compared to the case where fuel is injected using a single fuel injection valve, the ratio between the minimum injection amount and the maximum injection amount of fuel can be increased, and the required value of the rotary engine can be met. become. Also, the amount of fuel injected when fuel is injected and supplied to one working chamber from the two fuel injection valves 25 and 26 is the amount of fuel injected by the fuel injection valve that started fuel injection during the intake stroke of that working chamber. This is the total amount of fuel injected by the fuel injection valve that continues to inject fuel from the intake stroke of the working chamber that precedes this working chamber by one, and the injection period of the fuel injector becomes substantially If it changes continuously,
When transitioning from a state in which fuel is injected into one working chamber from one fuel injection valve to a state in which fuel is injected from two fuel injectors, the amount of fuel supplied to that one working chamber changes continuously. In this manner, it is possible to increase the number of connections without causing so-called joint defects.

The attached FIG. 4 is a schematic longitudinal cross-sectional view showing one embodiment of a multi-cylinder rotary engine in which the fuel injection supply method according to the present invention is implemented, and FIG. 5 is a plan cross-sectional view thereof. In these figures, 50,5
0' is a rotor housing having trochoidal inner circumferential surfaces 51, 51', respectively, and these rotor housings 50, 50' are arranged spaced apart in the width direction, as clearly shown in FIG. An intermediate side housing 69 is disposed between the two rotor housings 50, 50' to close the inner end surfaces of each of the rotor housings, and the outer end surfaces of the two rotor housings are provided with separate side housings. It is closed by housings 52 and 53 and constitutes two cylinders. Inside the cylinder, triangular rotors 54 and 54' are provided with apex seals 55 and 55' provided on the three top sides of the rotors, respectively, and apex seals 55 and 55' are attached to the trochoidal inner circumferential surface 5.
1,51' while sliding the common eccentric shaft 5
It is provided so as to eccentrically roll around 6.
In this two-cylinder rotary engine, the two rotors 54, 54' are normally installed in each cylinder with a phase difference of 180 degrees in terms of output shaft rotation angle. In this case, the front cylinder defines three combustion chambers A, B, and C between the rotor housing 50, the side housing 52, the intermediate side housing 69, and the rotor 54, and the rear cylinder defines the rotor Three combustion chambers A' are provided between the housing 51, the side housing 53, the intermediate side housing 69, and the rotor 54'.
B′ and C′ are defined. A side intake port 5 is provided at one trochoid short axis portion of the trochoidal inner circumferential surface 51 of each of the rotor housings 50, 50' at a position on the advancing side of the rotor rotational direction.
7, 57' and 58, 58' are provided facing each other, and peripheral exhaust ports 59, 59' are provided at positions on the lag side in the rotor rotational direction of the short axis of the trochoid. Further, spark plugs 60, 60' are provided at the other short axis portion of the trochoidal inner circumferential surface 51 of each of the rotors 50, 50'.

the side intake ports 57, 58 and 57';
58', air is supplied from an air cleaner 61 via an intake air amount sensor 62, a throttle valve 63, and an intake manifold 64. The intake manifold 64 has branch pipe portions 64a, 64 connected to each of the side intake ports.
b, 64a', 64b', and fuel injection valves 65, 66, 65', 66' are provided in each of these branch pipe parts. That is, two fuel injection valves are provided for one cylinder. Each of the fuel injection valves operates based on an injection signal generated by the electronic control unit 67, and is configured to inject fuel toward the side intake port. in this case,
As shown in FIG. 6, the fuel injection valves 65 and 66 and 65' and 66' are operated alternately to inject fuel alternately. The electronic control unit 67 is connected to the intake air amount sensor 62.
An injection signal with a predetermined pulse width is generated in a well-known manner based on the intake air amount signal generated by the engine rotation speed sensor 68 and the engine rotation speed signal generated by the engine rotation speed sensor 68, and this injection signal is used as the fuel injection signal. It outputs alternately to the injection valves 65, 65' and 66, 66'. In this case, fuel injection valves 65 and 66 and 6
5' and 66' perform fuel injection alternately,
The fuel injection valves 65 and 65' and 66 and 66' each inject fuel simultaneously.

In this case, the same injection signal may be given to the fuel injection valves 65 and 65' and 66 and 66' at the same time, so the electronic control unit 67 is configured in the same way as in a one-cylinder rotary engine. It's fine. Therefore, the electronic control unit 67 does not become complicated even if the number of cylinders increases, and reliability can be improved and costs can be reduced.

Although the present invention has been described in detail with respect to specific embodiments above, it will be understood by those skilled in the art that the present invention is not limited thereto, and that various embodiments are possible within the scope of the present invention. It should be obvious.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view showing one embodiment of a rotary engine in which the fuel injection supply method according to the present invention is implemented, FIG. 2 is a plan sectional view thereof, and FIG. 3 is a fuel injection timing of a fuel injection valve. FIG. 4 is a schematic vertical sectional view showing one embodiment of the fuel injection supply method according to the present invention applied to a multi-cylinder rotary engine, FIG. 5 is a plan sectional view thereof, and FIG. It is a graph which shows the injection timing of a fuel injection valve. 10, 50, 50' ~ rotor housing, 1
1,51,51'~trochoidal inner peripheral surface, 12,
52, 13, 53 ~ side housing, 14, 5
4,54'~rotor, 15,55,55'~apex seal, 16,56~eccentric shaft, 17,57,
57', 18, 58, 58' ~ side intake port,
19, 59, 59' ~ Peripheral exhaust port,
20, 60, 60' ~ spark plug, 21, 61 ~
Air cleaner, 22, 62 ~ intake air amount sensor,
23, 63 ~ Throttle valve, 24, 64 ~ Intake manifold, 25, 65, 65', 26, 66,
66'~Fuel injection valve, 27, 67~Electronic control unit, 28, 68~Engine speed sensor, 69
~ Intermediate Eight Side Housing, A,
B, C, A', B', C' ~ Working chamber.

Claims (1)

[Scope of Claims] 1. A polygonal rotor slides its top portion along the trochoidal inner circumferential surface within a casing composed of a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing. A plurality of working chambers are defined by each side of the polygonal rotor, the trochoidal inner peripheral surface, and the side housing, and an intake port and an exhaust port are opened on the inner surface of the casing. In this method, two fuel injection valves are provided for one rotor, and the two fuel injection valves are operated alternately during each intake stroke of each working chamber. The fuel injection valves inject fuel alternately, and during high-load operation, the fuel injection period of each fuel injection valve is extended until the fuel injected from the fuel injection valve is supplied to two successive working chambers. Characteristic fuel injection supply method for rotary engines. 2. A polygonal rotor eccentrically rolls within a casing composed of a rotor housing having a trochoidal inner circumferential surface and a side housing that closes both ends of the rotor housing, with its top portion sliding along the trochoidal inner circumferential surface. , a rotary engine cylinder in which a plurality of working chambers are defined by each side of the polygonal rotor, the trochoidal inner peripheral surface, and the side housing, and an intake port and an exhaust port are opened on the inner surface of the casing. In a fuel injection supply method for a multi-cylinder rotary engine having a plurality of units, each of the rotary engine cylinder units is provided with a first and a second fuel injection valve, and the first and second fuel injection valves of each of the rotary engine cylinder units are and the second fuel injection valves are operated alternately during each intake stroke of each working chamber, and each of the first fuel injection valves and each of the second fuel injection valves of each of the rotary engine cylinder units is operated simultaneously. The first and second fuel injection valves alternately inject fuel into one rotary engine cylinder unit, and simultaneously inject fuel into each rotary engine cylinder unit to avoid high-load operation. A fuel injection supply method for a multi-cylinder rotary engine, characterized in that the fuel injection period of each fuel injection valve is sometimes extended until the fuel injected from the fuel injection valve is supplied to two successive working chambers.