JPS60104754A - Exhaust gas recirculation apparatus - Google Patents

Abstract

PURPOSE:To improve exhaust gas purification performance and combustion performance by controlling function of EGR valve on the basis of detected level of pressure in engine combustion chamber thereby enabling correction of fluctuation or again of EGR gas flow. CONSTITUTION:A pressure sensor 4 is provided while facing against the combustion chamber of internal-combustion engine 1 to provide the output signal to an average effective pressure operating means 28 in controller 28. Said operating means 28 will operate the work DELTAPi during 5 deg. CA from the combustion pressure level after A/D conversion and variation of cylinder volume. DELTAPi is added for the accumulated values E, F of negative (compression) and positive (expansion) work then the values subtracted of each adding level E', F' are divided by the stroke volume Vh to produce othe average effective pressure Pi. Pi is representative of torque and used in control level operating means 29 to produce a control level to be used for performing duty control of ERG valve 13.

Description

[Detailed Description of the Invention] Technical field) The third technology is to apply IJAI to the exhaust gas recirculation system of internal combustion engines.
do.

PRIOR ART Exhaust gas recirculation systems (EGR systems) for internal combustion engines are known, in which a conduit (conduit or boat) is provided connecting an intake passage and an exhaust passage, each of which leads to an engine combustion chamber. The exhaust gas that is recirculated to the intake passage is controlled by the operation of the EGR valve installed in the engine. Such an EGR gas furnace provides 4 nitrogen oxide NOx discharge rivers, and when the EGR gas amount decreases, the ♀ elementary oxide use increases, and when the EGR gas amount increases, the nitrogen oxide hoe decreases. However, the combustion of the engine becomes unstable, and in the worst case, it can lead to a misfire. Therefore, the amount of EGR gas is generally
It is determined based on the investigation and torque fluctuation, and is especially set at the very edge of the allowable value for torque fluctuation.

Conventionally, the operation of the EGR valve for controlling EGRlj-t has been performed mechanically using intake pipe negative pressure or exhaust pressure. Naturally, there are manufacturing variations in such mechanically operated EGR valves and pressure regulating valves, and therefore, EGR'M varies depending on the manufacturing variations. moreover,
When soot and the like arrive in the gas passages of the EGR valve, etc., there is a change over time in which the amount of EGR decreases. Such variations and changes over time cannot be corrected by a four-way mechanically operated EGR valve.

OBJECTS OF THE INVENTION The object of the present invention is to correct the above-mentioned variations in the EGR gas level and changes over time, thereby achieving both exhaust gas recirculation and combustion performance of the engine. The purpose is to provide the equipment.

Structure of the invention In this book, the engine is heated, the pressure in the room is 4)
The EJ = step that comes out, and the first step that comes out sideways. (1) A control stage is provided to control the operation of the EGR valve based on the indoor pressure.

In the following English examples, please refer to the C drawings for the book m+, 1j'll.

I will clarify.

FIG. 1 shows an internal combustion engine to which the present invention is applied, in which a piston 2 is arranged at 1/l<1, and a combustion chamber 3 is formed above the piston 2. Ru. Combustion chamber 3
Intake passage and exhaust,! The intake passage consists of a factory cleaner 4, a carburetor 5, an intake pipe 6 and an intake boat 7. The exhaust passage is Shi J1 Ki,
-1? ) 8 and an exhaust top 9, and a catalytic converter 10 is disposed on the exhaust top 9. Connect Kanki Seki 9 and Intake Seki 6, =! Four pipes 11 and 12 are provided, and these pipes 11 and 12 are connected to the EGlt valve 13 and the valve contact 3,
Le. Therefore, a part of the exhaust gas in the exhaust pipe 9 enters the EGR valve 1 valve pressure 3 through the fl gas 11 pipe 11, is regulated there, and is then sucked into the intake pipe 6 through the passage pipe 12. .

The EGR valve 13 is composed of, for example, a near solenoid type valve, and as shown in FIG. ...Controls one product. In order to control the EGR valve 1 valve pressure 3, a pressure sensor 14 is provided facing the combustion chamber 3, and its output I
I] Control 4ε where control number 1- is composed of a digital computer
It'i 20 K-manpower.

Signals from a crank angle sensor, an engine speed sensor, and others are input to the control device 20 by a discharging pickup 15 of an IJ beater. control device re
20 is a central processing unit CPU 21, read-only memory ROM 22, random access memory 7 IJ RAM 2
3 etc., No. 41 of the pressure sensor 14 is inputted via the A/1) converter 24, and the crank angle signal and engine rotation speed Ih@ etc. from the electromagnetic pickup 15 are input manually to the human interface circuit 25. . .

lj to the control device 20 and an output interface circuit 2
6, and all the above-mentioned ν elements of the control device 20 are connected to the bus 27.
They are mutually connected.

The 31st mel is a diagram in which only the operation p performed in the ambidextrous 20 of Fig. 1 is based on the basic principle 1iiiI J', and I' for the EGI 4J'i:・primary arrangement NO 1 out jii', ,1
l (20' is a graph showing the torque fluctuation and the average Ij effective pressure fluctuation rate. As EGIL tri is added, the compound discharge 1i decreases. However, on the contrary, it can be seen that the torque change 1fj)I increases.

It is shown in the figure that the four-hole combustion that lights up is maintained at 411'. Tolerance of masturbation i)・
1 jilj rill immediately near the ν limit 47. ;It is better to set the ¥ value.

In response to this, the control center of EGltlT+ is established. The average effective pressure C is representative of the torque, and the torque fluctuation and the average effective pressure fluctuation rate correspond to each other. p:i, by this? , “°bare sweat” monster excretion 1
1 Notification 1: EGR'1ijl that balances torque fluctuation with
l iu is possible. In the present invention, the engine combustion chamber 3
This was made possible by detecting the internal pressure.

FIG. 4 shows the basics of the present invention (consisting of 16 parts).

(i) from the sensor 14 that detects the pressure inside the combustion chamber 3
When No. 1 is manually applied to the control circuit 20, the average effective pressure nv calculation means 28 is operated, and the result is inputted to the control value calculation means 29 at 40. The purpose is to add iR to the control center value of the 31st line 1 by the 10 control values determined in this way. Then, such a control value is generated by the driving Buddha number generation means 30 and the duty unit No. 1 and L7.
The output is output to the IGGR valve 13.

FIG. 5 is a flowchart showing the average effective F) and the means 28 of FIG. In step 61, it is determined whether the crank 21U: quasi-information signal is ON. Crank t and ear 1 shall be turned on at the point where the compression of the cylinder whose pressure is to be measured is lowered.

Base f'7i Reset the value of the crank counter C with the platform, step, and no' (]2 when the sleeve is ON. When it is OFF, add "1" to the value of the counter C with the Stella f63. In other words, the crank position is determined by fi (+') of C. Step 64 It is determined whether C≦72.

That is, it is determined whether the cylinder to be measured is in the compression stroke or the expansion stroke, and when C''>72, step 1 is completed.

If C≦72 (l), in step ``65, the A/D-converted postural pressure Ill'I-(P) is extracted.In step 66, the crank-in i, 5° CA 49 cylinder volume change 1□1゛(Δ■
) from the diple previously written in the ROM. Extrude. In step 67, the distance λ'111KΔP1 between 5° CΔ is calculated from Q, 1, and the cylinder volume focusing 1.1 to CP).

Next, in step 68, it is determined whether C≦36. zhwachi, current IJ)hiλi+i (j' :p:: (
Negative work) or],]'+I5iI-stroke positive work]11
), and if C≦36 (compression), then lf, i
−, in step 069, the summation value IC of negative work is set to ΔP.
Apply i. c) Step 70 (=) adds ΔPi to the cumulative value F of positive work. In the case of C/72, the process is completed above. At step 72 on the C-72's lifting platform, half-uniform treatment J, 1... Pressure Pi = (F-E)
Calculate %Vhp)-L RAIVI K 1AtL l
, fa. Vb is the stroke volume. Stetsuno”7
3 Reset Kasuν Iris 11'3JF with VC.

The mean effective pressure PiU calculated in this way is then used for control (used by the substitute n means 29). Figure 6
Ifl shows a control value performance flowchart.

First, calculate the average effective pressure Pi (ΔM or 1.). Examine it (step 51). At Stetsuno 52, Pi for 16゛ recycle is converted to itΔM (Δ1.Δ2...
... 111- is stored in Δ16), and the counter 13 counting 16 cycles is excited. In step 53, it is determined whether the value of the counter B is 16". In other words, it is determined whether Pi for 16 cycles has been measured. The equipment GF of Bi12 ends the process. .

As for the degree of B-16, in step 54, the fluctuation of Pi (indicated by the numerator &s') is calculated by 1-1 month.

It is the standard deviation squared. For the minute ↑, it is +- by the following formula.

1 of this implementation 1911. Self, at 0stesono 055 with ■ = 16, reset 16-Lee Ikulkasonta +32. Compare the value of the variance (S2) obtained in step 56 with the setting of 1 night, which is determined by -). At step 57, the control value is decreased by 1φ. (w
Direction to reduce Glt effect) 32≦, setting fi? +;'i
:>j Step 58i/trowel control value 1%J
1'l plus -4 ru. This completes the process.

According to this, 7-7C, 'J (Mera Sai 1 tli control (
i1'], D is 1st G) also 3rd I
J'L is suspended at the center of 111°1. 2, the control i,'+ll value In corresponds to the well-known 11:1
(30 to 1cGIt valve 30vC)
--Tii;K number is output.

In addition, in the above example, t;t: 'at, I'm in the middle of the day; 1.] Internal combustion engine 1:
It is clear that FC-11-1 can also be used. In this case, it would be possible to put out the pressure of ``(...2 υ(-)'' for ``Li9 Haru Mishi Harizuki no...''.

Effects As explained above, 1) According to the present invention, the pressure in the combustion chamber is detected in the engine. This means that the effects of mechanical variations in the parts have been corrected. Therefore, the EGR control is performed based on the new information of the combustion chamber pressure J(U, 'i), so it even compensates for the influence of aging.Furthermore, the pressure sensor can easily adjust the combustion chamber pressure. Therefore, according to the present invention, the J gas purification and combustion performance can be maintained optimally. I can do about 7L.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the exhaust gas recirculation system 4'' according to the present invention, and Fig. 2 shows the operation of the E valve (1).
A block diagram showing the present invention, FIG.
! Of course, FIG. 4 is a basic I11 diagram of the exhaust gas recirculation system, FIG. 5 is a flowchart for calculating the average effective pressure, and FIG. 6 is a flowchart for calculating control values. 1... Engine body, 3... Combustion chamber, 6... Intake pipe,
9...exhaust pipe, 11.12...49 pipe, 13...
- EGR valve, 14... Pressure sensor, 20... Control device b', 28... Average effective pressure calculating means, 29... Control i1i calculating means, 30... Drive signal generating means. Patent Applicant Toyota Motor Corporation Patent Application Representative Patent Attorney Akira Yoiki Patent Attorney Kazuyuki Nishidate Patent Attorney Kyo Nakayama Patent Attorney Akira Yamaguchi Valent Series 1± Nishiyama Jayama:,;-,11:) <O Second Meden-11 Town Figure 3 EGR: t+! ;j jin 4 figure 2.0

Claims (1)

[Claims] A conduit is provided by connecting an intake passage and an exhaust passage that lead to an engine combustion chamber, and a valve device is provided in the conduit, and the recirculated exhaust gas is controlled by the operation of the valve device. An exhaust gas recirculation system characterized in that the recirculation device comprises means for detecting the pressure within the engine combustion chamber, and control means for controlling the operation of the valve device based on the detected pressure within the combustion chamber. Device 6゜