JPS58172425A - Control for supercharger of engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a supercharger that supplies pressurized air to an engine.

The supercharger that supplies pressurized air to the engine's intake passage is usually rotated by the rotation of the engine's crankshaft or by the exhaust exhaust tiLt driving force. Supercharging is carried out over the entire operating range from high engine speed to high speed and high load operating ranges.

However, since the operating conditions of the engine are constantly changing, it is not preferable to constantly operate the supercharger in all operating ranges, as this may cause a loss of power depending on the case.

Ninthly, conventionally, the intake passage upstream from the throttle valve in the intake passage is branched into the supercharging control passage and the supercharging passage 111'c, and the supercharging control valve is provided in this supercharging control passage, and the supercharging passage is An air pump is provided as a supercharger, and the supercharging control valve is closed in conjunction with the closing operation of the throttle valve using a link or the like as an interlocking mechanism. Therefore, when the throttle valve is closed or its opening degree is small, the supercharging control valve is open and the supercharging air is released to the intake upstream side, and when the throttle valve is closed, the supercharging control valve is open. Between meals or in a range close to fully open, the supercharging control valve is fully closed to allow complete supercharging.

However, when the supercharging control valve is fully closed and only the supercharging intake air is supplied from the air pump, the pressure of the supercharging intake air, so-called supercharging pressure, increases excessively, and the enon operation becomes unstable. It is not preferable in this case. For this reason, - to prevent the above boost pressure from exceeding the set pressure,
For example, a relief passage for bypassing the air bomb ff is formed in the supercharging control passage, and this relief passage is provided with an IJ lj-f valve mmt for controlling the supercharging pressure. It was composed of one relief valve that fully opened the IJ-F passage to release the supercharged intake air when the pressure exceeded the set pressure. However, if there was only one relief valve, this The valve hole of the IJ leaf valve is formed to a hole diameter that can ensure the required maximum escape flow il'f of the supercharged intake air, so the hole diameter of the valve hole is large. For this reason, with conventional relief valves, the valve hole opens fully even when the boost pressure slightly exceeds the set pressure, making it impossible to control the boost pressure based on the relief flow rate. There were no defects”.

111 This invention was made based on the above-mentioned circumstances, and its purpose is to adjust the flow rate of the supercharged intake air released through the relief passage W& to 1J according to the above-mentioned supercharging pressure.
1411, and the supercharging pressure based on the relief flow rate of the fuel is increased to 1*
<Our objective is to provide a control device for an engine supercharger that can be controlled.

That is, the present invention provides at least a coiled relief valve in which the above-mentioned relief valve mechanism is closed by a 1ml valve body formed in a relief passage and whose nine valve holes are biased from inside the relief passage by an allFine member; The second valve hole formed in the first valve body can be opened and closed by a second valve body biased from within the IJ IJ-7 passage by a second spring member having a smaller biasing force than the first spring member. Close1I21
The second relief valve controls the supercharging pressure by the second relief valve. The more we meet, the more we get together.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, 1 is an Ennon syringe, 2 is a piston, 3 and 4 are an intake hole and an exhaust hole, respectively, which are ilMed by an intake valve 5 and an exhaust valve, respectively. The intake hole 3 is communicated with the intake passage 1 via the surf tank it. A throttle valve t is provided on the downstream side of the intake passage 8. The throttle valve 1- is connected to a throttle shaft 10 so as to rotate integrally with the throttle shaft 10, and a throttle lever 11 is attached to the throttle shaft 10 so as to rotate integrally therewith. A nine actuation lever 12 is connected to the slot kV-'4-11, which is connected to a throttle operator (not shown) such as an accelerator pedal. Therefore, when the accelerator pedal is depressed, the throttle valve 9 is rotated and the intake passage 8 is opened.

The upstream end of the intake vent 111 communicates with the atmosphere opening 14 of the air cleaner 13. 15 is the cleaner element,
16 indicates an air flow meter. The upstream side of the intake passage 8 between the air flow meter 16 and the throttle valve 9 is branched into a supercharging passage 11 and a supercharging control passage 11. Above supercharging passage 17
There is an air pump as a supercharger in the middle! For example, the vane bonder 11 is installed, and the winding between the vane 47flll and the crankshaft is routed through a transmission means and an electromagnetic clutch (none of which is shown). The power transmitted from the penboard/decoder 1# is cut off. Further, the opening and closing of the electromagnetic tubes are controlled by command signals from an electronic control device 10 such as a microcombi, etc. 9 throttle open sensor 2
2 and engine 011J [The operating state of engine 011J is determined based on the respective O signals from sensor 23, and when this operating state reaches a predetermined operating mode, the command decoupling is performed to connect the electromagnetic talate. It is configured to output the meeting.

A supercharging control valve 24 is provided. This supercharging control valve 24
is integrally attached to the control valve shaft 2j, and the control lever 2- is connected to the control valve shaft 25 so as to rotate integrally therewith.

For example, a link lever 21 is provided between the throttle lever 11 and the throttle lever 11, and these levers 11 and 213 can be interlocked with each other.

The opening/closing operation of the supercharging control valve 24 is performed based on the opening/closing operation of the slot seat part 1 which grasps the operating state of the engine, and when the throttle valve 9 is opened/closed by the link lever 21, When the throttle valve 9 is closed, the supercharging control valve z4 is closed, and when the throttle valve 9 is closed, the supercharging control valve 24 is opened.

A relief passage 2s that bypasses the vane I/f 19, that is, the supercharging control valve 24, is formed in the supercharging control passage 18. This I) l)-F passage XZVc is provided with a relief valve mechanism 1112B, and in this embodiment, this relief valve mechanism 21 is connected to the first relief valve 3.
- and 2 relief valves and 3 lines. That is,
The line 1 relief valve jO is formed in the relief passage 28.
The valve hole 32 is configured to be able to be closed by the coiled valve body 11. It is biased in the direction of closing. In addition, the second relief valve 31 is configured to close the second valve hole 3j similarly with the second valve body S- as soon as the first valve body JjK% is pressed. 2 above 2nd
The valve hole 35 is moved in the direction of closing the valve hole 35. In addition, in this embodiment O, the biasing force of the @2 coil spring 31 is set equal to the set pressure of the supercharging pressure. The first valve hole JjO is set to 111 to ensure the maximum escape flow rate of the supercharged intake air.

Next, the operation of the above embodiment will be explained.

For example, when the Ennon is operating at low speeds and under low load, such as when idling, the accelerator pedal is not depressed, so the throttle valve 9 closes most of the intake vents 8, and the supercharging control valve 24 is fully open. The operating mode of Ennon has not yet reached the predetermined operating mode. Therefore, in such a case, since the power transmitted from the crankshaft to the vane bonder 19 is the same, the vane bonder 19 is not rotationally driven and supercharging is not performed yet.

Then, when the accelerator pedal is depressed, the valve opening of the throttle valve 9 increases, and the operating state gradually approaches the above-mentioned predetermined operating mode.

Then, when the operating state layer reaches a predetermined operating mode, a command signal from the electronic control device 20 is delivered to the electromagnetic clutch VC@, and the electromagnetic clutch and C are connected to rotate the vane bonder 19. . As a result, supercharging is started, but the supercharging pressure is low because the upper overhang control cell 24 is not yet fully closed at this point.

Furthermore, by depressing the accelerator pedal,
As the throttle valve 9 approaches full opening, the supercharging control valve 24 becomes fully closed at a predetermined timing. Therefore, in such a case, the supercharging control passage I is controlled by the supercharging control valve 24.
Since I is disconnected, the intake air flowing through the throttle valve tt is only supercharging intake air, and complete supercharging is performed.

When supercharging is performed in this way, when the supercharging pressure exceeds the set pressure tc, this supercharging pressure first hits the biasing force of the second coil spring 31 in the @2 relief valve 31. Push up the second valve body 3# and open the second valve hole xi
As a result, the supercharged intake air passes through the relief passage 28 from this j@2 valve hole 3J, passes through the vane/yfxe, and escapes to the intake upstream side, and the supercharged intake air flows through the throttle valve 9. It is based on the above-mentioned striking pressure. In addition, if the above boost pressure is abnormally high than the set pressure, the boost pressure may be lower than the set pressure.
By combining the biasing forces of not only the ls2 coil spring 11 and the first coil spring t234, but also the combined force of Kumura's forces, the first
Push up valve body IIJt, JII2 valve hole zso-7+1z
bfl11 valve hole S2% will be opened. As a result, a large flow rate of supercharged intake air flows from this JI11 valve hole J2 to IJ
The supercharging pressure of the supercharged intake air, which is released to the upstream side through the 9-f passage 28t and flows through the throttle valve 9, is quickly maintained at the set pressure, and the engine rotation is maintained in a normal state. I can do it.

Therefore, according to such an embodiment, if the boost pressure is slightly higher than the set pressure, the agi valve IS
A second valve hole with a diameter of 9 is formed in JJt! 1111, the throttle valve 9' can be used to release a small amount of supercharged intake air.
The supercharging pressure of the T-flow filtration intake air can be precisely controlled to follow the above set pressure, and if the supercharging pressure becomes abnormally higher than the set pressure, the large diameter No. 19P hole jJli is opened. The supercharging pressure can be quickly controlled to follow the set pressure. As a result, the supercharging intake air is not released more than necessary compared to the conventional method, so there is an advantage that the supercharging efficiency can be improved.

Note that the present invention is not limited to the above-mentioned embodiment 6 For example, as shown in No. 2 Iil, the second valve body 36
An I-id rod 40 is provided on the guide rod 40t.
The second valve body sgo is slidably guided by the f-id hole 41.
It may be possible to prevent lateral vibration, or
As shown in FIG. 4, if the lower end of the I-id rod 40 is further slidably guided by the I-id hole 42 formed in the first valve body 33, not only the gz valve body 3C but also the 1 valve body ssowa* can also be prevented. In addition, in this case, the second valve hole 35 may be composed of a plurality of valve holes 31m centered around the upper guide hole 42.

Further, the relief valve mechanism 21 includes a first relief valve 30, a second relief valve 30, and a second relief valve 30.
The second valve is not limited to one consisting only of the relief valve 31.
Relief valve JJ (a third valve hole is randomly formed in OjI2 valve body 1#, and this third valve hole t) 43 Relief valves may be used to open and close, or two or more relief valves may be combined. may be configured.

In addition, the IJ IJ-F passage is not limited to the supercharging control passage II, but may also be provided with the supercharging passage J74C. It may be configured.

In this embodiment, the opening/closing operation of the supercharging control valve 24 is linked with the throttle valve 9, and the opening/closing operation of the supercharging control valve 24 is controlled by a control signal from the electronic control device 20 or the like. It may be controlled independently from the above.

As described above, the present invention provides at least a first valve that can open and close the relief horizontal structure by a 19P body biased by a first spring member from within the relief passage, and a first valve hole formed in the relief passage. a second relief valve that closes the second valve hole formed in the first valve body by a second valve body having a smaller biasing force than the first spring member from within the relief passage; It is characterized by its great power. Therefore, when the supercharged 1 atmosphere O exceeds the set pressure slightly exceeds the set pressure, the small second valve hole formed in the 1111 valve body is opened to allow a small flow of supercharged intake. Also, if the boost pressure is constantly higher than the set pressure, the large GI valve hole is opened to release a large flow of supercharged intake air, allowing the supercharging pressure to follow the set pressure with high precision. The effect is great.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an intake system showing one embodiment of the present invention, Figs. , No. 411 is an arrow from the W-W direction in Fig. 3, :,,! ■It is. 1... Intake passage, 9... Throttle valve, 11...
Supercharging passageway, 11...Supercharging control passageway, 1#...Pennnnnn! (Supercharging 11&), j 4-...Supercharging control valve, X-
1, Relief passage, 29 Relief valve mechanism, 30
... outside the system 41 relief valve, 31 ... second relief valve, 32 ... 1 flat 1 valve hole, 33 ... first valve body, 34 ...
...first coil spring (first spring member), 35...second
yP hole, 36... second valve body, 37... second coil spring (second spring member). Applicant's agent Patent attorney Takehiko Suzue 11゜

Claims (1)

[Claims] The intake R@ above the throttle valve in the intake passage of the engine is branched into a supercharging passage and a supercharging control passage, and a supercharger driven by engine operation is provided in the supercharging passage, and the supercharging A supercharging control valve is provided in the control passage, and the supercharging control valve is operated to open and close depending on the operating condition of the engine, and the supercharger is connected to the supercharging control passage or the supercharging passage. A relief passage is formed and a relief valve mechanism is provided in this relief passage, and when the supercharging pressure sent from the turbocharger through the supercharging passage IIt exceeds the set pressure, the relief passage is closed by the relief valve mechanism. In a control device for an engine supercharger that opens and releases the supercharging pressure to the intake upstream side through the relief passage, the relief valve mechanism includes at least one valve hole hole 171J-F formed in the relief passage. a first relief valve that can be opened and closed by a first valve body biased by a first spring member from within the passage; and a second relief valve formed on the first valve body.
and a second relief valve whose valve hole can be opened and closed by a second valve element biased from within the relief passage by a second spring member having a smaller biasing force than the first spring member. A control device for an engine supercharger.