JPS60190627A - Control method for air-fuel ratio of variable suction swirl system internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent the occurrence of failure in ignition, by a method wherein, in an internal combustion engine equipped with a suction negative pressure- operated varying swirl system, when the negative pressure of a suction pipe is below a given value, a fuel amount is increased. CONSTITUTION:From the number Ne of revolutions of an engine read in a step 1 and a pressure P of a suction pipe read in a step 2, a reference injection amount TAUb is determined in a step 3. In a step 5, it is decided whether the opening of a throttle read in a step 4 is brought to an operation range in which suction swirl takes place. In a step 6, a plug F, which indicates that swirl is not effected, is set. Since a valve for controlling swirl can not be operated when the negative pressure of the suction pipe is below a given value, a device is formed so as to protect against swirl when the negative pressure of the suction pipe is below the set value, and a fuel amount is increased. This prevents the occurrence of a failure in ignition.

Description

[Detailed Description of the Invention] The present invention relates to an air-fuel ratio control method for a IIJ variable intake swirl H type internal combustion engine used in vehicles such as automobiles. Air-fuel ratio control method for a variable intake swirl internal combustion engine having intake control Ift that is opened and closed by a drive means operated by intake pipe negative pressure (Regarding 3).

Background of the invention i+J variable intake stool 15 Ji used in internal combustion engines
: As one of the intake boat structures, between the combustion chambers 11
Between the helical passage turned around the end and the
It has a space (helical passage) that communicates in the form of a white line, and the front ri + 4
An intake control valve for opening and closing the passage to the Stray 1 is installed in the middle of the Stray 1 passage. 5 1
1/II”4 (Unexamined Japanese Patent Publication No. 11i (5 7-1 6 5 6
2≦)) and patent application II! 156-120634S (4'rl River 11!IE58-2."3224) has a Meroku (one pair of Reni has already been proposed, and an internal combustion engine with the structure of this rod In the engine, when the straight passage is closed by the intake control valve, all of the intake air (mixture) flows through the helical passage (flowing into the combustion chamber, creating a strong intake air inside the combustion chamber). A stool is formed, which allows the combustion chamber to move into the combustion chamber.
The flame propagation speed of
-) It is possible to operate with a Cm lean mixture, and the stray 1-passage is spaced by the λ・1 intake control valve (
When the intake air flows into the combustion chamber through the helical passage and the Cs 1 Heley 1 passage, a strong intake swirl is generated in the combustion chamber. Flow 11 (resistance is low,
A reduction in the charging efficiency of the internal combustion engine is avoided. Therefore, in an internal combustion engine with (-1-)rB river angle, intake port 1-measurement 'I:lN, in the low-angle r4 operating range ([91. Intake control I+ valve closes, High i load operating range
IIIllll 1'By knowing that in low load operation 1, the air-fuel ratio'C is close to the fuel-air-fuel ratio in this poem.2
It is possible to operate with a lean mixture with an air-fuel ratio of about 2.-1F3, and in the high-I pre-operation range (even above), it is possible to operate with a lean mixture with an air-fuel ratio as high as 8. Although it becomes impossible, the charging efficiency is prevented from falling to II('F ''l), and a large engine output can be obtained.

In this low 91A operating range where the 1c intake control valve is open, the maximum flammable air-fuel ratio when the intake control valve is closed is close to the misfire limit W air-fuel ratio on the lean side. The air-fuel ratio mixture is supplied to internal combustion (between the stages), and in the operating range where the intake control valve is open, the air-fuel ratio is low enough to avoid misfires and obtain human output (1 question). It has already been proposed to supply an internal combustion engine with U-air gas having an air-fuel ratio smaller than the air-fuel ratio in the operating range.

The above-mentioned opening/closing drive of the intake control valve is generally performed by a driving means such as a tie-pulling device operated by the intake pipe 11 pressure taken out from the intake system of the internal combustion engine. This drive means is used by many S
During low-load operation, when the intake control valve must be closed, the intake pipe tJ is more sufficient than during high-odor load operation.
Focusing on the fact that [( is obtained, the intake control valve is opened when intake pipe negative pressure equal to or higher than a predetermined value is supplied, and the intake control valve is opened when intake pipe negative pressure equal to or higher than a predetermined value is not supplied. It will cause the valve to open.

However, - the intake control M by the driving means as described above;
＋When the valve is driven to open and close, the pressure on the accelerator pedal is slightly reduced, the throttle bulge in the engine intake system is reduced, and the engine intake system closes. Is the air-fuel ratio of the mixture supplied to the engine negative?
Although the intake pipe negative l[ of the predetermined value is 1r, the intake pipe 0It required to close the intake control valve is ( Therefore, the intake control valve is closed f, and as a result,
When the intake control valve is closed and the air-fuel mixture with an air-fuel ratio close to the maximum air-fuel ratio is being supplied to the internal combustion engine, the intake control valve is still open. Sometimes internal combustion engines will misfire, reducing operating performance and causing low F.
i do

Purpose of the Invention The present invention provides a method for supplying rare Rt1M air to an internal combustion engine by overriding all other control threads f1 when the intake pipe n, which is necessary to close the intake control valve, is not satisfied. M, +L,
At this time, in order to prevent the internal combustion engine from misfiring due to the intake control valve not being closed, the air-fuel ratio is lower than the optimum air-fuel ratio in the lean-burn operating range. The purpose of this invention is to provide an air-fuel ratio control method that can supply air-fuel to an internal combustion engine.

According to the present invention, an air-fuel ratio of a variable intake swirl type internal combustion engine having an intake bow structure as described above and a driving means operated by negative pressure in the intake pipe as described above is obtained. In the control method, when the intake pipe i(1 is detected and the intake pipe negative pressure is n
This is achieved by the air-fuel ratio control method characterized by increasing the amount of fuel supplied to the internal combustion engine at 1 o'clock at 1 o'clock.

Effects of the Invention According to the air-fuel ratio control method for an internal combustion engine according to the present invention as described above, when the intake casing 11 is less than the predetermined value, that is, the intake pipe negative pressure necessary to close the intake control valve is When this is not possible, the amount of fuel supplied to the internal combustion engine is increased.
(Due to lack of negative pressure in the intake pipe in the operating range where the intake control valve is normally closed) (When the intake control ff is open instead of closed, in this state the internal combustion engine If there is a large amount of air/fuel It that would cause a misfire, (1) In rare cases, the supply of air to the internal combustion engine may be avoided due to a lack of f (intake pipe negative) (intake 1b IJ control valve closes) This prevents the internal combustion engine from misfiring and deteriorating its operating performance when the engine is in the fourth position.

'C11 The present invention will be described as an embodiment with reference to the attached FIG. 4 above.
TI! I will explain it to Il.

FIG. 1 shows an embodiment of an intake nJ variable swirl type internal combustion engine in which the air-fuel ratio control method according to the present invention is implemented. U indicates the main body
Aj, the internal combustion engine main body includes a cylinder 1 [], a cylinder head 33, a piston 5 provided in a cylinder bore 1 of a cylinder block 2, and an intake valve (i).
Cl1tl fit by intake boat 7,''
The mixture with the combustion air is sucked into the combustion chamber 8.

The combustion chamber 8 is ignited by the spark of the large plug 9 (T,'λ), and the burned gas of 1.:dW is pumped into the combustion chamber 8, which is opened and closed by the exhaust boat J:dW. It is designed to be discharged outside the combustion chamber.

Intake bows 1 to 7 are as shown in figure f52,
Guide vanes 10 bulging from the ceiling walls of the intake bows 1 to 7 lead to the combustion chamber 8 by rotating around the end 7a. :l\\Regical passage 11 and space]-1 It has a straight passage 12 which communicates linearly with the end 7a. An intake control valve 13 is installed in the middle of the stray passage 12 to open and close the passage. As shown in FIG. 1C, a drive lever 15 attached to the valve stem 14 is connected to a die (anora lx device 16) which drives the die (anora lx device 16), and is opened and closed by the diaphragm device. It has become like that.

The guisephram device 16 blocks communication of the straight passage 12 when a negative pressure of a predetermined value of 1 inch or more is introduced! ! i
7. Place the intake control valve 13 in the closed position shown.
On the other hand, when a negative pressure higher than a predetermined value is introduced, the intake control valve 13 is driven to an open position that establishes communication between the slate passage 12 and the slate passage 12.

41) (There is a boat a of the solenoid valve 19 by the conduit 18.)
In addition to boat a, the electromagnetic control valve 19 has a boat 1) and a popular L1 bow 1-(), and when the electromagnetic coil is energized, the electromagnetic control valve 19 connects the boat 1-a to the boat 1-a. 1-b K is connected, and the electromagnetic cable is energized (when it is not connected, boat a is connected to boat 1-0. Between tII and 2
0, through the reverse 11 valve 21 and the conduit 22, it is connected to the engine intake system's leakage tank 24 (two-stage), and the intake negative pressure take-out port 25 is connected, and the intake response is applied to the negative pressure f1-.
U (1 nii j-) (there is).

The intake manifold 23 is connected to the intake bow 1-7 in sequence (two consecutive connections).
- A torque valve 26 for controlling the intake air is installed in the air inlet 11 of the intake tank 24.
- Fuel 1fj split nozzles 27 are installed in holes 1 to 23,
The fuel injection nozzle is supplied with a liquid fuel such as gasoline from the fuel supply system shown in the figure, and injects a liquid fuel with a flow rate of 1. The air supply is directed towards the inlet of the lil intake boat 7.

Control of energization to electromagnetic control valve 19 and fuel injection nozzle 2
The valve opening control in No. 7 is performed by the control device N30. The series 9I1 device 30 is an electrical control ill'3A device including a general microcomputer, and transmits information related to the engine speed Ne from the distributor 29 of the engine ignition system to the intake pipe pressure lens 1) 31. More information related to intake pipe pressure P can be found here!・From 1 good center 32 to 72 (5 no s [I tsu) -
1)), and these information and predetermined information are used to control the energization to the electromagnetic control valve 19, i.e., the intake control. Valve 13
The opening/closing control of the fuel stone injection OJ nozzle 27, that is, the air-fuel ratio control is controlled by fj.

FIG. 3 shows the main routine flow +?-1 which is executed by the control device 30.
J, output signal J, detected fil function rotation speed NO.
is read.

After Step 1, the program proceeds to Step 2, in which the Stellar 12 (L, intake pipe power +j detected from 31) is read.

Next to step 2 (, L Proceed to step 3, Step 3
At ((Y), the basic duty suspension is determined from the engine speed Ne and the intake pipe pressure P.

, λa/30 Next is 7'4/\\ advance, step 4
When C is detected by the printer 32, it is possible to read and read L-1b.

Next to Stella 171 (,1 step to 5, step!
i Ill at l; 1
Degree 1 h Ka predetermined Inn△Identification of whether the person is new or old is +
i 41 J. The predetermined value 11f1△ is the amount of intake control valve 13.
(i.e. intake control) When there is a valve closing operation range C' of I'13.1.
．． goes to Stella 16, and when there is no 11)゛・Δ'C-, when there is a tapped intake ff1l+valve closing operation range C of control valve 13 (or returns without passing through Step 6).

In step 6, the CG converts the flag [4 to 1].

FIG. 4 shows the relationship between the air-fuel ratio of the air-fuel mixture and the thrower lit degree when the basic injection lift [ΔIJ l+ is applied.

As is clear from this graph, in the closed operation range of the intake control valve 13 in which the hemi between the strokes L1 and 1 is greater than the predetermined value Δ, the air-fuel ratio of the air-fuel mixture supplied to the internal combustion engine is In the valve-closing operation range of intake control (III3) in which the temperature is large and the degree of throttle is greater than the predetermined value, the air-fuel ratio of the air (supplied to the internal combustion engine) is relatively small. .

FIG. 5 shows the intake control 311 controlled by the control device 30.
Opening/closing control of valve 13) 1 code'f-+・-1~
It shows. This routine is interrupted at a predetermined time ftj, and in the first block 21 +, i (, it is determined whether there is -7 lag 1τ or not. When F=1, it is immediately The degree of rotation between the ras is specified (direction Δ
If the result is ``2'', the process proceeds to step 22, whereas F
−1, that is, the degree between
If there is no more, proceed to Stella 123.

At Stella 122, power supply to the electromagnetic control valve 19 is stopped, and the intake control valve 13 is closed.

Slab-723+
At this time, electricity is applied to the valve 1, and the intake throttle valve 133 is closed. At this time, if the intake pipe ('Jul) required to avoid closing the second intake control valve 134 is not completed (secondly, the intake control valve t13'3 is closed due to a flaw in the intake valve 134, and if the intake pipe remains in the flow valve state). Yes.

FIG. 6 shows the air-fuel ratio control routine non-n-Tl--1-, which is performed by the control device 30 at f+1'-+. This routine is interrupted at every predetermined crank angle of the internal combustion engine, and in the first step 31 (,1,
It is determined whether No. 7g 1 is I C (16) or fortune-telling. l" = i 'i (At some time, step 334 On the other hand, at 1-1, when the intake control valve 13 is in the closed operation range lρ, the process proceeds to step 32.

At step 32, the intake pipe H force is set to a predetermined value B, and a determination is made as to whether or not the intake pipe is open. At a given time (IB is the maximum amount of air required to close the intake control valve 13) when there is JC and Pn/Bt-, the amount of intake air required to close the intake control valve 133 when struck. Mouth pressure is 1 <[Imoe (, 2, proceed to step 35, t):> B
'C: G: When the intake pipe (1L1 is set to 1) is required to close the intake control valve 13, step 3
Proceed to step 3.

In step 33, the -flag 1- is converted to 0.

After step 33, proceed to Stella/34, and step 34
In this case, the basic jet 9,j, AU, determined in the main routine STELLA (1) is changed to 71° effective fuel jet (△()). stella f3
After 4, proceed to Stella 13) 6.

At STELLA 135 (in step 3 of the main routine) (determined basic injection Q. In other words, in this step, the amount of fuel is increased.

In step 36, the fuel injection according to the determined effective fuel injection city [ΔLJ is applied to the fuel 1v1 injection nozzle 27 in the actual 11
be done.

Air-fuel ratio Iil+ 011 by Ki Komei like L ili
Depending on the method, the intake pipe n pressure is required to close the intake control valve 13 when the intake control valve volume is below a predetermined value in the valve operation range between LJ and stroke. When the amount of fuel is not increased, the intake control valve 13 is not properly closed, but the air-fuel ratio is too low. This prevents the internal combustion engine from causing a misfire.

Hereinafter, the present invention (,, i, 0 (<1) shall be explained in detail with respect to specific embodiments, and 7). , within the iIQ range of tree 51 Akira (various embodiments are possible (it is obvious from the name of this rod (Aro-)1゜

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram of one embodiment of an internal combustion engine of the IIJ variable intake swirl system used to implement the l,ru1u fuel ratio control method, presented by Akira Kim, and Figure 2 is the same as that shown in Figure 1. Figure 3 is a schematic cross-sectional view showing the intake boat structure of an internal combustion engine. One graph shown,
Figure 5 shows the flowchart of the intake control valve opening/closing control routine.
1-1 FIG. 6 is a chart of an air-fuel ratio control run for implementing the air-fuel ratio control method according to the present invention. 1...Internal combustion engine, 2...Shillingbu [1tsuk, 33
... Cylinder head, 4... Cylinder bottom, 5.
··piston. 6... Intake valve, 7... To bleed air bow 1, 8... Combustion chamber, 9... Spark plug, 10... Kite vane, 1
1... Helical passage, 12... Stre~1-passage, 1
3...Intake control 911 valve, 1/I...Valve shaft, 15...
・Drive lever, 1G...Gui\7noram device, 17...
Kaku 8 ['rad, 1E1...) 9 pipes. 19... Solenoid control valve, 20... Conduit, 2'1...-
non-return valve. 22... Conduit, 23... Intake manifold, 24...
・・Leige tank, 25・・Intake pipe negative pressure takeout bow 1・
, 26...S[''Tsurubulp, 27...Fuel injection nozzle. 28...Exhaust manifold, 29...Distribution 1 to evening, 30...Control device, 31...Intake pipe pressure level. 32...Throttle distance center Figure 1\,' Figure 3 Figure 4 A γ Figure 5 Figure 6 (voluntary) Procedure supplement i) - Book May 1980 71 '1. Showa 594 "Special W1 Application No. 046"
799/2, Gwangmyeong Name Variable Intake Swirl 6 Type Internal Combustion Engine Air Fuel Ratio 1'l II
I: Q method; 3. The person who goes to the 1st floor of the sleeve 1 What relationship Special ¥ 1 Applicant Address Aichi Prefecture! 9 Ill rli t-Elrimachi 1
Address Name (320) l・=1riAutomatic Chukyo Stock Co., Ltd. 1
71, Attorney i'Ji's 104 Tokyo Chuo (Nu Shinyo 1-5-19) The scope of the claim is amended as follows: 1 (1) Around the opening end to the combustion chamber An intake boat structure including a straight passage passing in a straight line at one end between the spiral helical passage and the straight passage, and an intake control valve for opening and closing the straight passage provided in the middle of the passage to the straight 1; The intake control valve is driven by the intake air negative IT and is supplied with an intake pipe negative pressure higher than a predetermined value. Air-fuel ratio control 9111j for a variable intake swirl internal combustion engine, which has a driving means for opening a valve.
Law 1 Go II? 'l, detect the intake pipe negative pressure, and detect the intake pipe negative pressure (1
An air-fuel ratio control method (1) characterized in that when the pressure is less than the predetermined value, the amount of fuel supplied to the internal combustion engine is increased. (2. Claim 1) 4' Also, in the air-fuel ratio control method (, the driving means is configured to control the air-fuel ratio control method when the intake control valve is closed. 11 Negative pressure is applied to the intake pipe until the pressure level increases beyond the predetermined value.
The suction pipe is filled with negative pressure, and the suction pressure of the suction control valve increases beyond the predetermined predetermined value, and at two o'clock atmospheric pressure is introduced, and the suction control valve of When the intake pipe negative pressure becomes larger than a predetermined value when the valve is opened, the intake pipe negative pressure is introduced, and when the intake control valve is opened, the intake pipe negative pressure reaches the predetermined value. An air-fuel ratio control method characterized in that the fuel supplied to the internal combustion engine is increased only when the fuel is not satisfied.
[Correct each of the above 1's in line 9 to be "greater than". (3) 1- on page 9, line 13 of the specification. , insert the following sentence to Shun in 1. The check valve 21 only allows the flow of fluid from the conduit 20 to the conduit 22, and when the boat a of the electromagnetic control valve 19 is connected to the boat 1), the diaphragm station 1 (3)
The negative pressure in the intake pipe is enclosed in the intake pipe. j (4) For internal use in the 12th line 3ij...[4th
The diagram is... small. ” to be deleted. (5) ``Figure 5'' on page 12, line 12 of the specification is corrected to ``Figure 4 1.'' (6) ``Figure 6'' on page 13, line 10 of the specification is corrected to ``Figure 5.'' I am corrected. (7) If the valve is in the 1-valve open operation range on page 13, lines 15 to 16 of the specification, proceed to step 34, and change 1.1 to ``If the valve is open, proceed to step 32, and correct it to J.'' ( 8) In the specification box page 13, line 17t'i-18, [In the valve-closing operation range, proceed to step 32.] When the valve is closed by 1, proceed to step 34.j] (9) Page 15 of the specification, line 3 to line 5L+, 1) According to the present invention as described in the book, the flag 1- is set to 1 by the routine as described above. By adding four lines of switching control, the intake control valve 13 is
The valve opens when the valve opening increases beyond a predetermined value Δ, and closes when the intake pipe pressure decreases beyond a predetermined value of 1 mB. That is, the opening control of the intake control valve 13 is performed according to the throttle opening degree, and the valve closing control of the intake control valve '13 is performed according to the intake pipe negative pressure. When the intake control valve 13 is controlled to close, the electric current of the electromagnetic control valve 19 is energized, and the boat A is connected to the boats 1 to II. The negative pressure in the intake pipe is sealed in the 7-norm device 16 by the action of the check valve 21. Therefore, the negative pressure in the intake pipe at the throttle opening A that opens the intake control valve 13 causes the intake control valve 13 to open. Even if the value required to close the valve is not reached, the intake control valve 13 maintains the closed state by the enclosed donkey of the diaphragm support 16. When the intake control valve 13 is open, the current 1- Due to the fuel increase regardless of the small opening,
1 liter opening is specified ("J is reduced even when the intake control valve is closed below J". 1, based on the fact that the intake control valve 13 is open, the increase in fuel consumption by 1 is revised to j. ...... Correct -1 for Figure 5 to ``Figure 4''. (12) Change ``Figure 6'' to 1' in line 6 of No. 15 of the specification.
m 5 Fig. fJ iI d-R. (13) Figure 2 of the drawings is corrected as shown in the attached drawing. (14) Delete Figure 4 of the drawings. (15) Correct the drawings to read ``Figure 5 J as in Attachment 1 Figure 1 Figure 4''. (16) "Fig. 1 of the drawing 1" as shown in the attached drawing "Fig. 5 1"
I am corrected. Figure 2

Claims (1)

[Claims] Combustion'! Around the 11th interval to i'+, there is a 1" straight passageway and a straight that connects in the form of a white line at the end of said slate passage. The intake bow 1 structure in which the intake control 4t that opens is installed, and the intake pipe? Close the intake control valve 4r1!Predetermined 1!"τ1'
11 intake quality (supplies i 11.
'i L2(l, said intake!l-control jt opened 11
(iRuru1 Variable Intake Swirl Ii)
Air-fuel ratio control lj method for internal combustion 1 in the formula (3C, intake pipe C111 detected l-, the 1 air injection r1 angle is the above j soi
Air-fuel ratio control 11 characterized by suspending 111 fuel to be supplied to an internal combustion engine (2)
1j method.