JPS6093124A - Intake device of rotary piston engine - Google Patents

Abstract

PURPOSE:To enable prevention of any shift of operation area of a switching valve at the time of accelerated and ordinary operations by providing a compensating means which compensates, according to the state of operation, delay of operation of an actuator against change of pressure in the upper stream from a throttled portion of a pressure fluid introducing path. CONSTITUTION:At the time of accelerated operation, change of pressure in a pressure chamber 21 delays by a throttle 29, and even if the exhaust pressure on the side of upper stream from the throttle 29 attains the predetermined value the pressure is lower than that inside the pressure chamber 21. And at the time of the above accelerated operation, an intake negative pressure before acceleration is introduced into a pressure reducing chamber 23 by a throttle 34 until the predetermined rotational speed is attained. And even after it reaches the predetermined rotational speed and an electromagnetic valve 32 is changed to the air introducing state, the atmosphere is gradually introduced into the pressure reducing chamber 23 by the throttle 34. Thus, negative pressure remains in the pressure reducing chamber 23 during the period which corresponds to the delay of response of pressure inside the pressure chamber 21 against change of exhaust pressure, and the operation pressure of an actuator 20 is lowered. And when the exhaust pressure reaches the predetermined value in the same way as an ordinary time, a switching valve 15 is operated to open, and the delay of operation of the actuator 20 at the accelerated time is compensated.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an intake system for a rotary rev engine. The present invention relates to an improvement in an intake device in which the intake boat for high loads is opened at high loads by widening the boat and using an on-off valve operated by a diaphragm type actuator.

(Prior art) Conventionally, in a rotary piston engine, there are two intake bows 1 to 1 for light loads that supply intake air to the working chamber in all operating ranges and intake bows 1 for high loads that supply intake air to the working chamber only during high loads.
- is opened into the working chamber, and a device is known that simultaneously satisfies fuel efficiency in a light load range and output performance in a high load range.

For example, the device shown in the 5749735 bow publication is equipped with both of the above-mentioned intake boats, and is provided with a medium-load intake boat 1- which supplies intake air to the working chamber in the medium-load range or above, and In the intake system of this scale, the intake boat for high load closes later than the intake port 1 for light load as the rotor rotates. The above-mentioned high-load intake boat is connected only at high loads by an on-off valve operated by a die A7 flam type actuator.

In other words, a pressure fluid such as exhaust gas whose pressure changes depending on the engine load and rotation speed is introduced into the pressure chamber of the above-mentioned acupuncture chamber, and when the pressure inside this pressure chamber is less than a set value, the above-mentioned on-off valve is turned on. When the pressure is above the set value, the on-off valve is turned on. The set value of the above pressure is adjusted in advance using a spring etc. attached to the actuator, so that even if the load on this table becomes quite high, if the high load intake bow is 1 to 4, the output will be insufficient. In addition, even if high-load intake air is heard at low rotational speeds, the filling rate will decrease due to blowback, etc., so the above setting values are set with these points in mind. Adjusted to the optimal value on the output side.

By the way, normally in such a device, in order to prevent the operation of the actuator from becoming unstable during steady operation due to pulsations such as 1 atmosphere gas pressure, the pressure chamber is A restriction is provided in the pressure fluid introduction passage c'J. In this case, during acceleration operation, the pressure in the pressure chamber upstream of the throttle changes rapidly, while the pressure in the pressure chamber changes with a certain delay. There is a difference in the valve closing operation range of the actuator between acceleration operation and steady operation, so the setting is made to give the optimum opening/closing valve operation area during both of the above operations. For this reason, in the past, for example, emphasis was placed on output performance requirements during acceleration, and the setting value was set in advance so that the optimal leap valve operating range during acceleration was set. The above-mentioned deviation in the operating range was addressed by making adjustments, etc.

(Object of the Invention) In view of the above circumstances, the present invention provides a restriction in the pressure fluid introduction passage to the actuator that operates the on-off valve of the intake boat for high loads, and it is possible to reduce the pressure during acceleration operation and during steady operation. An object of the present invention is to provide an intake system for a rotary vis 1-hen engine that can eliminate deviations in the operating range of an on-off valve between different times and provide good θT output performance during both of the above-mentioned operations.

-4- (Structure of the Invention) The present invention has the light load intake port 1-A3 and the high load intake boat opened in the casing, and as the rotor rotates, the high load intake port Intake bow l-J:
The above JZ sea urchin is also closed late, and the above two bows 1~4
At the same time, the flt opens and closes the high-load intake boat.
In a rotary piston engine that is equipped with a closed valve and a flam-type actuator that opens this on-off valve at high loads, and a throttle section is installed in the pressure fluid introduction passage to the pressure chamber of this actuator. 1. Restriction part J indicated by IZ: A correction means is provided to correct the delay in actuator operation in response to pressure changes in the upstream pressure fluid according to the operating condition. The operating range of the on-off valve during accelerated operation is made to almost match the operating range during steady operation.Exhaust gas or intake negative pressure may be used as the pressure fluid for operating the actuator. can.

(Actual flow example) In Figure 1, 1 is a rotary piston engine 5
- A rotor housing 2 having a trochoidal inner circumferential surface, and a 1-noid housing 3 (one 4-noid housing is not shown) disposed on both sides of the rotor housing 2. has been done. The casing 1 is equipped with a polygonal rotor 4 supported by an eccentric shaft (not shown). The rotor 4 rotates rapidly M while its top side is in sliding contact with the inner circumferential surface of the rotor housing 2, and defines a working chamber 5 within the casing 1.

Inside the casing 1, there are at least a light load intake boat 6 and a high load intake boat 8 680, and in the J embodiment shown in the figure, the light load intake boat 6 formed in one side housing and the other Medium-load intake bows 1 to 7 and high-load intake bows 1- are formed on the side housing 3 of
The three bows of 8] are open. The intake boats 6 for light loads and the intake boats for medium loads] to 7 are provided at corresponding positions on both side housings so that they open and close at the same timing as the rotor 4 rotates. The bows 1-8 are provided in the closed positions of the intake bows 6-1, 6, and 7J for light loads and medium loads. The above-mentioned intake boat 6 for the CJ vi is connected to a primary side intake passage 11 equipped with a primary throttle valve 10 that operates in all operating ranges, and is connected to each intake boat 1 to 7 for medium load and high load.
．． 8 is connected to a secondary intake passage 13 equipped with a secondary throttle valve 12 which is heard in the medium load region and high load region.

In addition, an opening/closing valve 15 that opens this intake boat 8 at high load is installed in the intake bow 1-0 for high load in Jl. Intake is performed only from the secondary throttle valve 12 in the middle load range and above.
is heard so that air is taken in from intake bows 1-7 for medium loads, and when the load is high, the on-off valve 15 is turned on so that air is also taken from intake bows 1 and 8 for high loads. The engine is designed to improve fuel efficiency and output performance under high loads.

The on-off valve 15 is formed into a cylindrical shape and is rotatably inserted into the high-load intake bow 1-8, and has a portion 1 attached to its peripheral wall.
5a, and opens and closes the working chamber side port 8a of the high-angle cylinder intake bow 1-8 as it rotates. And this on-off valve 15 tJ: , rod 16, lever 17, link 18 and shirt 1-19
It is designed to be actuated by a Gui A7 flam type actuator 20 via.

The actuator 20 includes a pressure chamber 21 that introduces pressure fluid for operating an on-off valve, an atmospheric chamber 22, and a decompression chamber 23 that moves in one correction step.
has a double diaphragm structure partitioned by first and second diaphragms 24 and 25, and the pressure chamber 21
The shields 1 to 19 are connected to a first diaphragm 27I that partitions the air chamber 22 and the air chamber 22. This first diaphragm 24 is connected to a spring 2 installed in the atmospheric chamber 22.
6 is elastically supported by the second die (/flamm 25) that partitions the atmospheric chamber 22 and the decompression chamber 23, etc.
The H on-off valve 5 is biased in the direction of closing. Further, the second diaphragm 25 is elastically supported by a spring 27 installed in the decompression chamber 23, and this spring 27 is set to have a stronger elastic force than the spring 26 which is parallel to the atmospheric chamber 22. 8- There is.

Input gas such as JT force fluid is introduced into the pressure chamber 21 in A3 of the actuator 20 from an exhaust passage (not shown) via a pressure fluid introduction passage 28. Two throttles are provided, and the pulsations of the exhaust pressure introduced into the pressure chamber 21 are absorbed by the throttle 29.
: I'm trying to do it. The atmospheric chamber 22 is provided with an opening 30, and the inside of this chamber 22 is always maintained at atmospheric pressure. Further, the decompression chamber 23 is connected to the primary side intake passage 11 downstream from the primary throttle valve 10 via a negative pressure introduction passage 31,
In the above, the one-pressure introduction passage 31 is provided with a three-way solenoid valve 32. This three-way solenoid valve 32 is electrically connected to a rotation speed detection switch 33 that closes when the engine rotation speed is below a predetermined rotation speed (for example, 250 rpm). Negative pressure is introduced into the decompression chamber 23, and when the predetermined rotational speed J is increased, the negative pressure introduction passage 31 is closed and the atmosphere is introduced into the decompression chamber 23.This three-way solenoid valve 32 and the depressurization chamber A throttle 34 is provided in the passage 31a between 23 and -9-.

In addition, 36 is the primary side bench stiffness part of the carburetor, 37 is the secondary side bench 1 part, 3B is the flow 1 to chamber, 39 is the main jet 1/10 is the air bleed, and 41 is the primary side main nozzle ( The secondary side is not shown).

Figure 2 shows the high-load intake bow 1 in this intake system.
Curves A1 to D171 show the characteristics of the average effective pressure in the working chamber that corresponds to the engine speed using the intake negative pressure (pressure difference from atmospheric pressure) as a parameter, for when ~8 is closed and when it is opened. '3 and Δ2~C2.

In other words, when intake bow 1-0 for high load is closed, the relationship between engine speed and average effective pressure at various intake negative pressures is shown in curves Δ1 to D1. When the intake bows 1-8 are opened, the dimensional characteristics of the curves Δ1 to C1 described above change to those shown by the curves A2 to C2, respectively. Also, in the same figure, a dashed dotted line E.

"The exhaust pressure is 300 mm l-l g and 80 m, respectively.
m1l [J line is shown. Then, the intake negative pressure acting on the J group depressurization chamber 23 is
200mm HQ or less (above line C1 in Figure 2)
The spring force is set at J, which expands at 200 degrees and contracts at more than 200 degrees (below line C1 in Figure 2). Further II
IO20mm l-10 line [and intake negative pressure -200
mm At the intersection with line C1 of HQ (1292 rotation speed is the rotation speed (2
50Orpm). From this figure, you can understand J: sea urchin, characteristic curve 1, A2, B1
And 82, is the high angle at the point where C1 and C2 intersect each other? I
The most advantageous method is to set the air intake bows 1 to 8 between <j;
This corresponds to the case of 11CJ. Based on such a characteristic ('1), the actuator 20 operates to maintain the pressure chamber 21 (2) at a predetermined value (30
It is preset that when an exhaust pressure of 0 mm HQ or more is introduced, the first diaphragm 2/4 is pushed toward the atmospheric chamber 22 and opens the on-off valve 15. Furthermore, in FIG. 2, 1-1 indicates a rotation speed range in which intake negative pressure is introduced into the decompression chamber 23, and 1-1 indicates a rotation speed range in which the pressure reduction chamber 23 is popular. There is.

In this intake stomach, when the engine rotation speed is below the predetermined rotation speed (250Orl) m)
Intake negative pressure is introduced into the g pressure 923 of the T-tor 20 via the three-way solenoid valve 32, and in this state, the second diaphragm \25 is attracted and supports the first diaphragm 7 flam 24. Since the force is weakened, that is, the spring force of the spring 26 is weakened, the operating pressure required to open the on-off valve 15 is lowered, and for example, the exhaust pressure introduced into the pressure chamber 21 is reduced to 80 mm l-4CI. Although the on-off valve 15 will be opened even if the engine is running at such a low speed, the exhaust pressure will also be 80 mm HQ.
J: Since the temperature is sufficiently low, the gap is not opened until ↑151. ! Z il', 3, engine speed is 250 Or
pm or less and the exhaust pressure is 80 mm l-I Q-1
In the - operating range, the intake negative pressure is less than -200 mm l-10, so the spring horn of the spring 27 of the decompression chamber 23 overcomes the intake negative pressure, and the diaphragm 25 moves upward (fl'
Therefore, even if 1) 1 pressure -12- is 80 mmNG or more, the on-off valve 15 is not heard.

In the operating range above a predetermined rotation speed, atmospheric pressure is introduced into the decompression chamber 23. Therefore, under steady operating conditions in which exhaust pressure fluctuations are slow, the exhaust pressure is at the predetermined value (300 tnm I-
1 (J), this pressure is introduced into the pressure chamber 21 of the actuator 20, thereby closing the on-off valve 15, and the high-load intake ball l~8'/J
Hiro-inspiration is performed.

In addition, during acceleration operation in which the exhaust pressure changes rapidly, the pressure change in the pressure chamber 21 is delayed by the throttle 29 provided in the pressure fluid introduction passage 28. Even if the side exhaust pressure reaches the predetermined value, the pressure chamber 21
The pressure inside is lower than this. On the other hand, during this acceleration operation, a moderate amount of j-tangle occurs before the inside of the decompression chamber 23 reaches atmospheric pressure due to the throttle 34. In other words, until the predetermined rotational speed is reached, the intake negative pressure before acceleration is reduced to the decompression chamber 23. After the three-way solenoid valve 32 switches to the atmosphere introduction state upon reaching a predetermined rotational speed, the atmosphere is gradually reduced by the throttle 34 between the three-way solenoid valve 32 and the decompression chamber 23. /Z is introduced into the decompression chamber 23. Therefore, negative pressure remains in the decompression chamber 23 for a period corresponding to the response delay of the pressure in the pressure chamber 21 to changes in exhaust pressure, and this reduces the operating pressure of the actuator 20, so that it is almost equal to the normal state. Similarly, if the exhaust pressure reaches a predetermined value, it's 1'! I valve 15 is operated to open. In this way, actuator 2 during acceleration
0 actuation delay will be corrected.

In the above embodiment, the reason why the three-way solenoid valve controlled by the engine speed was provided in the negative pressure introduction passage 31 was due to the second
As is clear from the figure, the exhaust pressure is 80 to 300 mtn.
This is to prevent the opening/closing valve 15 from opening during steady operation between HC1 and when the intake negative pressure is -200 mmF+a or higher.

FIG. 3 shows another embodiment of the correction means for correcting the delay in actuator operation during acceleration. In this example, there are 43
The actuator 50 that operates the on-off valve of the high-load intake port includes a pressure chamber 51 and an atmospheric chamber 52, and a diaphragm 53 that partitions them. 52 is equipped with a spring 54, and these structures (J)
It is similar to the actico air conditioner. However, from the throttle 56 of the pressure fluid introduction passage 55 to the distribution pressure chamber 51 -
A bypass passage 57 without a restriction is provided between the flow and the pressure chamber 51. .

This bypass passage 57 is provided with a solenoid valve 58 that opens and closes this passage 57. The bypass passage 57 is opened.

In this example, 1.11. Through comparison 56, the pressure is the pressure of the acticoator chamber 51
When the acceleration operation is turned on, the bypass passage 57 is inserted, and the exhaust pressure is quickly introduced into the pressure chamber 51. This will prevent delays in operation during acceleration.

(Effects of the Invention) As described above, the present invention [pressure fluid that introduces pressure fluid into the diaphragm type acticoator that opens and closes the intake port 1 for high loads] provides a restriction in the passage for nine people. In this system, when the pressure of the pressurized fluid upstream of the throttle increases sharply, the two-and-one-night delay in operation caused by this is compensated for by the compensation means. Therefore, it is possible to prevent the operating range of the on-off valve from shifting between the steady (T) rotation and the +) * operation, and to improve the output performance OL during either operation.

[Brief explanation of the drawing]

Fig. 11 is a cross-sectional side view of essential parts showing an embodiment of the present invention, Fig. 2 is a characteristic diagram of the mean effective pressure horn according to the zero intake pressure J3 and the T engine rotation speed, and Fig. 3 is a diagram of the correction means. It is a sectional view of the principal part showing another example. 1...Rotary piston T engine casing, 6.
...Intake boat for Vl load, 8...Intake boat for high angle cylinder 1-115...Opening/closing valve, 20.50...Actuator, 21.51...Pressure chamber, 23...Decompression chamber, 2
8.55... Pressure fluid introduction passage, 29.56... Throttle, 57... Bypass passage. -16- No. 2 Fig. 181'' Shear shoulder, / ・ A・ enemy7ta β7 outside (vertical μ Sada ＼ ro#'5;' and l, ・□ /°) 34? Insect No. 3 Fig.-11: 16-

Claims (1)

[Claims] 1. Open the light-load intake boats 1 to J: and the high-load intake boats in the casing, so that the high-load intake boats close later than the light-load intake boats 1 to 1 as the rotor rotates. In addition, when both ports 1~ are installed, the high-load intake ball 1~ is equipped with an opening/closing valve 16 and a diaphragm-type opening/closing valve that listens to this opening/closing valve during high loads. Then, the pressure flow (4
In a rotary piston engine where a throttle part is installed in the introduction passage, a correction means for correcting the delay in the operation of the computer according to the operating condition is installed in the rotary piston engine. An intake system for a rotary piston engine characterized by: