JPS6095152A - Valve control device for internal-combustion engine - Google Patents

Abstract

PURPOSE:To control safely the operation of an internal combustion engine by performing a fail-safe processing by means of detecting errors in a valve device which controls the flow rate of a fluid taken into the internal-combustion engine. CONSTITUTION:A calculation control device E calculates the target amount of adjustment according to the operating state of an internal combustion engine which is detected by an operating state detecting device B of an internal-combustion engine A; and controls a valve device C. When a deviation between the amount of adjustment detected by an adjustment amount detecting device D and the target amount of adjustment is greater than the prescribed value and lasts longer than the prescrived time, an error detecting device F performs an error detection processing. In the error processing, the operator is notified of an error, and the operation of the engine is stopped by cutting off the fuel or shifted to other specific conditions of operation. In this way, the engine can be controlled to operate on the safe side.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a valve control system for an internal combustion engine.

[Prior Art] As the electric control of internal combustion engines progresses, valve control devices that control various flow rates such as the amount of intake air to the internal combustion engine are becoming more and more popular. It has been used in various m111611 fields. One example of this is the idle speed control device, which improves fuel efficiency and improves fuel efficiency when the internal combustion engine is idling.
For the purpose of exhaust gas purification, the amount of air flowing into the bypass passage that bypasses the throat valve is adjusted by a valve means, and the idle rotation speed is adjusted by adjusting the idle speed of the internal combustion engine. The idle rotation speed control device precisely controls the idle rotation speed to the target value, that is, the target rotation speed, depending on the water temperature, the presence or absence of an empty VJ device, etc.
- Provided.

This method is usually called the idle speed control system (hereinafter also referred to simply as ISC), but it is generally used to detect the operating state of the internal combustion engine, such as the rotational speed of the internal combustion engine. A detector, an idle air amount adjusting means for adjusting the amount of intake air flowing through the bypass passage, and an idle speed control valve (hereinafter referred to as an ISO valve) that adjusts the amount of intake air flowing through the bypass passage according to the conditions of the internal combustion engine.
It consists of an idle rotation vI control means for controlling the internal combustion engine rotation speed by opening the C valve.

However, if the ISO valve malfunctions in the ISO, not only will it be impossible to control the idle speed satisfactorily, but if the engine continues to operate with the ISO malfunctioning, -C Problems such as internal combustion engine 48 being operated at abnormal speeds may occur, and in some cases, problems such as deterioration of fuel efficiency, deterioration of initial gas purification performance, or fluctuations in internal combustion engine speed may occur. Something happened.

This problem occurs in other internal combustion engine control systems, such as the exhaust gas recirculation system (EGR system) and the intake system air-fuel ratio feedback system, where the exhaust gas recirculation system is controlled by valve means.
A similar problem could occur with systems that control the amount of intake air.

[Object of the Invention] An object of the present invention is to detect an abnormality in a valve means for controlling an internal combustion engine, perform full-safe processing, make the internal combustion engine load highly reliable, and improve control safety. It is also about improvement.

[Configuration of Fengming] The configuration of the present invention, which has been made to achieve the above object, is as shown in FIG. A valve means C for controlling the flow rate of fluid by intermittent adjustment; an adjustment amount detection means 1 for detecting the +-+1rii product adjustment amount between the pulse means; and the operating state detection means B. In accordance with the detected operating state of the internal combustion engine, the 1] standard adjustment fR of the open 1-1 area of the valve means C,
＋titi camp, concerned]-1 mark adjustment hanging 31(zui-
(The state in which the deviation amount between the adjustment amount detected by the control stage 1- for controlling the valve means C and the adjustment amount detection means and the target adjustment amount is equal to or greater than a predetermined value is The gist of the present invention is a valve control device for internal combustion, which is characterized by being equipped with an abnormality detection means F that performs abnormality detection processing when the abnormality continues for a predetermined period of time or longer.

In the configuration described above, the abnormality detection process is a process of detecting an abnormality in the valve means, notifying the driver of the abnormality, stopping engine operation due to fuel shortage, etc., or shifting to a specific operation mode, etc. It means.

[Example J The present invention will be explained below by giving examples and referring to the drawings.

FIG. 2 shows the configuration of an embodiment of an internal combustion engine control system, that is, an engine control system, including an idle speed control device according to a first embodiment of the present invention. is the piston, 3 is the spark plug, 4
is provided in the +71 air manifold, 5 is provided in the exhaust manifold 4, and the remaining M in the exhaust gas II! Ill that detects Maro
A string sensor, 6 is a fuel injection valve that injects fuel into the intake air of the internal combustion engine main body 1, 7 is an intake manifold, and 8 is provided in the intake manifold 7, and detects the temperature of the intake air sent to the internal combustion engine main body 1. 9 is a water temperature sensor that detects the internal combustion engine cooling water temperature; 10 is a throttle valve; 11 is a throttle sensor that is linked to the throttle valve 10 and outputs a signal according to the IO during the throttle valve 10; , 12 is a bypass passage which is an air passage that bypasses the throttle valve 10, 13 is an ISC valve as a valve means for adjusting the opening area of the bypass passage 12 to adjust the idle air amount, and 14 is a valve body in the ISC valve 13. 15 represents an air flow meter that measures the amount of intake air.

16 is an igniter that outputs the n-electric II necessary for ignition;
Reference numeral 17 is connected to a crankshaft (not shown), and connects the convex shape 11 generated by the igniter 16 described in -1 to the spark plug 3 of each cylinder.
The distributor 18 is taken into the distributor 17 and outputs 24 pulse signals per one revolution of the distributor 17, that is, two revolutions of the I3 crankshaft. 19 is an internal combustion engine rotational speed center that outputs one pulse No. 742 per revolution of the distributor 17, 20 is an electronic control circuit as arithmetic control means including abnormality detection means, 21 is a key switch, 22 represents a starter motor, and 23 represents a vehicle air conditioner.

FIG. 3 is a detailed diagram showing the ISOSC pulp 13 composition. In the figure, 31 is a valve body that adjusts the frontage area of the bypass passage 12 and actually adjusts the amount of air passing through the bypass passage, 32 is a valve seat 1~, 33 is a diaphragm, and 34 is partitioned from the bypass passage 12 by the diaphragm 33. Each of the diaphragm chambers shown in FIG. The diaphragm 33 receives a force due to the pressure difference between the two sides and operates the valve body 31.

35 is provided in the diaphragm chamber of the diaphragm A7, and the diaphragm 3
The balance springs 36 and 37 that move the balance springs 36 and 37 are exclusively opened and closed by signals from the electronic control circuit 20 to introduce a predetermined negative pressure into the diaphragm chamber 34, and move the diaphragm 33 in balance with the balance spring 35. Finally, I made a valve body to adjust the amount of air in the bypass path! I
When the solenoid valve 38 hears the solenoid valve 36, the tie A
/ Atmospheric pressure impulse pipe that leads atmospheric pressure to the noram chamber 34, 39 is T
If41 valve 37 fills the diaphragm chamber 34 at 7 o'clock valve operation
-t and n-pressure impulse tubes, respectively.

FIG. 4 represents a block diagram of the electronic control circuit 20.

50 is a central processing unit 1-(CPU) which inputs and calculates the data output from each sensor according to the control program, and performs processing to control the operation of various devices such as the I'SC pulp 13;
51 is a read access memory (ROM) in which the control 11.1 program and initial data are stored, and 52 is a random address in which data manually input to the electronic control circuit 20 and data necessary for flow control are read. Memory (RAM)
, 53 are necessary for the internal combustion engine to operate even if the 42 switch 21 is closed. 54 is an input section which selectively sends the output signals of an input board (not shown), a waveform shaping circuit, and each sensor to the CPU 50 so as to retain the random data. It is equipped with a multiplexer for output, an A/D converter for converting analog signals into digital signals, and the like. Reference numeral 55 denotes an input/output section, in which an output boat is provided in addition to an input boat (not shown).
The SOSC pulp 13 is equipped with a drive circuit and the like that are driven according to control signals from the CPU 50. 56 is an arbitrary 11. 57 is a timer section that can set the time interval, start time counting from that point, and read the time value freely by the CPU 50;
50, each element such as ROM 51 and input section 54. Input/output section 55. The path lines connecting the timer 56 and through which each data is sent are respectively represented.

During idling, the C1 electronic control circuit 20 detects the temperature of the internal combustion engine cooling water, for example, the output of the water sensor 9 and the 0N of the air conditioner 23.
10FF etc., the target value of the idle rotation speed corresponding to each condition is determined, and the ISOSC pulp 13 is controlled. In this example, the control output according to the target value of the idle rotation speed is
The voltage is applied to the two solenoid valves 36 and 37, and the solenoid valve 36.
By changing the respective decoulets of the applied pulses so as not to open the valve body 37 at the same time, the magnitude of the negative pressure in the die A7 flamm chamber 34 shown in FIG.
Change the position of 1 to the target position, for example, PO.

Since the movement of the valve body 31 changes the frontage area of the valve seat portion 32, the amount of air taken into the internal combustion engine via the bypass passage 12 is increased or decreased by a predetermined amount, and the idle speed of the internal combustion engine is adjusted to the target 1 ft. Control +-41.

Next, in addition to the above-mentioned well-known I'S G, the control over the ISOSC pulp 13, which is a feature of the present invention and is executed in this embodiment, will be explained.

Jj to Isc, valve body 31 (7) +</tFl
It is assumed that there is an abnormality in the ISC valve 13 that would cause the deviation Then, the negative pressure in the die A7 flamm chamber 34 can no longer be maintained, and due to the action of the balance spring 35, the valve rest 31 moves, the opening area increases, and the internal combustion engine rotates at an abnormally high speed. The abnormality does not need to be caused by an increase in the internal combustion engine rotational speed with a response delay, and in this embodiment, since the position of the valve body 31 is detected, it is regarded as the occurrence of a deviation between the target position 61 Po and the actual position P1 of the valve body. It is possible,
15OI1111ll processes this and moves to the processing routine shown in FIG.

In this processing routine, control is started from FIG.
The electronic control circuit 20 controls the solenoid valve 36.
The duty of the control pulse applied to 37 is changed. Next step 101? l- starts timer 56
The time h count is started with the ll value set to zero. In step 102, the actual position P1 detected by the actual position P1 of the valve body 31 (position lens 1 for detecting tIa) 14 is read;
In the following step 103, it is determined whether the deviation 11P1-Pal between the detected actual position 1)1 and the target position is within the range of allowable deviation value ΔPO. However, even if the valve body 31 is not controlled due to damage to the diaphragm 33, the actual 4Ct@P1 read in step 102
remains far from the target (tL arrangement po). Therefore, the amount of deviation between the actual position P1 of the valve body detected by the position sensor 14 in step 102 and the target position Po is less than the allowable deviation value △PO. Largely, the process is step 10
Step 3 moves to step 10.4, where the elapsed time t from step 101 when control of the valve body position of the SC valve is started and the timer 56 is started is checked. If the elapsed time t is less than the set predetermined time +1 in step 104, the process returns to step 102 [again, the actual value υ of the valve body 31].
Read L Takumi P1 and continue step 103]゛1 mark position P
deviation from o tFi l P+ −P o l and tolerance −i
"; I+rlΔ]]o. However, valve body 3
i Since LL system 911 is not used, IP+-Pal is △1
) o is not the same, and in step 104, the corresponding progress +1
．． When i l becomes equal to or greater than 1 for a predetermined period of time, the process proceeds to step 1105, where it is determined that there is an ISOSC valve failure, and abnormality detection processing, such as fuel cut or display on an indicator, is performed, and the control is terminated.

If it is determined that the ISO valve 13 is normal, the electronic υ control circuit 20 switches on the solenoid valves 36 and 37 in step 100.
When the duty of the pulse applied to is changed,
By changing the relative valve time of the electromagnetic valves 36 and 37, the pressure introduced into the diaphragm chamber 34 changes and the position of the valve body 31 is changed, resulting in an increase or decrease in the opening area of the bypass passage. The idle speed is controlled up to the fI value.

At this time, the deviation f between the actual position P1 of the valve body 31 and the target position PO
Since f1lP+-Pal becomes less than or equal to the allowable deviation value Δ1]0 within the set time t1, the process moves from step 103 to step 1106, where it is determined that the ISOSC valve is normal, and from this routine 7: l S Cm1l
l Control information when returning to III, e.g. ISO valve 1
The flag indicating either "normal" or "abnormal" is set to 1 "normal" and this routine ends.

In the above processing routine, the timer settings mt,
LW'--'ir? (11* J-1, Tt'+Y&', control ll Ill It works as a function of the deviation amount IP+-Pol between the actual position P1 of the valve body at the start time and the target 1st bean paste Po.

The state of movement of the valve body 31 in the control of this embodiment is
As shown in the figure.

In FIG. 6, it is assumed that at a point in time indicated by A, that is, 1=0, the actual position P1 of the valve body 31 is a level IC from the target position W P o. This is explained in Section J, and the position sensor 14 continues until there is a change in the internal combustion engine rotation speed.
is taken into the electronic control circuit 20, and the electronic control circuit 2
When the valve body 31 approaches the 1'' mark position P o by 0, an a+++ control output is made to the ISC valve 13. At this time, if the ISC valve 13 is j1 normally C-, the actual value of the valve body 31 (da7 iFI I' + changes as shown by the broken line in FIG. The deviation h5 l P+-l' o l from P o returns to within the range of R'l displacement difference ΔP o.However, some kind of failure occurs in the ISO valve 13, and the valve body 31 is not normally controlled. )
Then, the actual value (η position) 1 of the valve body 31 remains as shown in the solid line in FIG. ;A ;SKIf”
+-Pol never falls within the range of the ti'f volume deviation ΔPO.

As described above in detail and as shown in the IC, in this embodiment, the deviation amount IP+ -Po between the actual position P1 of the valve body 31 and the target position within a predetermined time
By detecting whether l is within the range of allowable deviation value ΔPO, it is possible to detect an abnormality in the SC valve 13. Electronic IQ control section 20 is ISC valve 1
Detected abnormality 3 and found out that the fuel was hot! By performing an abnormality detection process such as displaying a - or an indicator, it is possible to prevent the engine from experiencing abnormal combustion in view of the internal combustion engine load.

Next, a second embodiment of the present invention will be described. A second embodiment to which the present invention is applied uses the same device as the first embodiment,
The following control is performed.

FIG. 7 is a flowchart showing the control of this embodiment.

In the figure, control is started from C, and the following processing is performed. In step 200, as in the first embodiment, lS
A control output for moving the position of the valve body 31 of the C valve 13 to the target position 12 P o is output from the electronic control circuit 20 to the ISC valve 13 .

Step 201 is for initialization of the control routine.
Set the number of measurements N for the valve body movement time. Here, N=
2> Start the timer from zero. Also, allowable deviation value Δ
The value obtained by dividing Po by the number of measurements N is set as S.

In the following step 202, the actual position 1]1 of the valve body is read from the position record 1 no 14, and in the next step 203C, the deviation m l between the actual position [1] 1 and the target II' / 1) 0 is determined.
Pl-P o l 7J calyx'l volume deviation value Δl).

Determine whether the value is below η. In step 203, the deviation amount IP+-Pal between the detected actual position rP+ of the valve body 31 once [1] and the target position Pa is the allowable deviation value ΔPa.
If the range is within the control range, the process moves to step 204, and the control period! I! The elapsed time t from 1 to 1 is over 1 (you can tell whether it is or not. The elapsed time t is set (
less than iflt1 (・If there is, the process returns to step 202
Return to step 4, place the length 4 (P1) of the valve body 31, and proceed to step 203. In the case where an abnormality occurs in the lSC valve 13 and the valve body 31 cannot perform 8fI,
Since the judgment in step 203 is No and continues to be negative, the judgment in step 204 becomes t≧11, and the process proceeds to step 205. This is the same process as steps 104 and 105 shown in FIG. If the Q difference amount lP+-Pol falls within the range of the allowable deviation hook ΔP o, the judgment in step 203 is YES and the process proceeds to slap 206. In step 206, after the control starts, the actual and fJ P 1d [1 mark position I
) Deviation of o IIP+ ~Pol is the allowable range deviation value ΔP
The time period until it is determined that it has entered the range of a for the first time is stored as TN. N at step 201 of initialization
=2, so here -1-N is 2. or,
In step 206, 1 is subtracted from N, assuming that the measurement of the valve body movement time has been completed once. In the following step 207, it is checked whether the number of measurements has been completed, that is, whether N=0. If N=O, the process proceeds to step 208
Now, the allowable deviation value ΔPO, which is within the 8'1 range, with respect to the deviation ff11P+-Pol between the actual position P1 and the target position Pa of the valve body is changed. Since S contains the value obtained by dividing the initially set n'1 volume deviation 1111Δl)o by the number of measurements N, the allowable deviation value for number S is reduced in step 208, and the process returns to step 202. A series of steps 202→203→206→207→208→
202... is repeated. When the measurement is completed N times (in this case, 2 times), the determination in step 207 is made to end the measurement, and step 20
The process moves to step 9. Step 209 assumes that the SC valve is normal, and uses the value of 1'N (here r is 2 of T2.1'l) stored in step 206 of the above process as control information. Save and end this processing routine. 11 of the N INs saved in this routine
As will be described later, j1 can be used as control information for IS(Er).

If the dilenorum 33 of the SC valve 13 is damaged or the valve body 31 is frozen, the eye hole 31 will not move to the target position P regardless of the control output from the electronic control circuit 20.
Does not move to a. For this reason, a timeout occurs in step 204 of the processing loop, and I
It is determined that there is an abnormality in the SO valve, and an abnormality display is displayed.
The engine can be stopped by a method such as a fuel cut, and safety in engine operation can be ensured in the same manner as in the first embodiment.

FIG. 8 is an explanatory diagram showing the movement of the valve body in J3 in the control of the second embodiment of the present invention. In the figure, the solid line J3 indicates the movement of the valve body 31 when there is no particular problem with the ISO valve. The valve body 31 is given a control output to move to the target position Po, but when the movement begins l1tl (from t = O), the deviation m l P+ -P, o l is the allowable deviation value ΔPo, Δ
Even though they are within the two setting ranges of Pa-8, only the times Tz and T+, respectively, are negative.

On the other hand, the dashed line in the figure indicates that when some abnormality occurs in the ISO valve, for example, one of the solenoid valves 36 and 37.
Or, if both valves are clogged and it takes time to change the pressure in the diaphragm chamber 34, the duty of opening the i'2211 valve 36 and 37 may be changed. This shows an example of the movement of the valve body 31 when the response of the valve body 31 is delayed. The valve body 31 is controlled to move to the target position IFffiPo, but the pressure in the diaphragm 934 changes only slowly due to valve clogging, etc., and the deviation amount I P+ -Pa
It takes Tz- and -1-+ - times for l to fall within the two setting ranges where allowable deviation values ΔPo and ΔPo-8, respectively.

In the second embodiment, feedback control of the re-idle rotation speed is performed at the engine speed of the internal combustion engine, and the response of the control system, that is, the 1 m of the ISC valve.
The feedback control output is corrected by the correction value according to flill til+ (j 11N+, which should be processed to prevent overflow, 2' body)
The initial state j [!
! (Figure 8, solid line) Adjustment 1
1. When the operation of the 5f holiday 31 becomes slow due to aging etc. (as shown by the broken line in Fig. 8), the A-barge in the feedback control,
This may lead to a downshoot or a hunting phenomenon.

However, in the control of this embodiment, the time TN required for the movement of the valve body 31 is measured, that is, the time TN required for the movement of the valve body 31 is measured.
15 is detected and stored, the well-known [not shown]
During SC control, the correction value sent to the feedback section 91 is increased or decreased according to the delay time TN.
If Il is performed, the valve body 31 may become damaged due to aging, valve clogging, etc.
Even if the operation becomes slower than the initial state, the correction value will be corrected according to the response delay time.
The idle speed can be controlled without causing hunting or the like.

In this embodiment, the operation time of the valve body 31 is measured twice, but it is clear that the present invention can be applied even if the number of measurements is one or three or more times. be. 1it ray t of lsc pulp
, - Upper 1T Ute 711 Otsuchi 2Wa 1yo 11117 people - If it increases the math time, N-1 may be used, or J , in the case of ISC pulp, N
By setting a plurality of values, it is possible to know the state of the response of the 180 pulp in detail and perform precise control.

1st. In the second embodiment, an ISO valve using a Ti magnetic plate 7 was explained, but a step-type ISC valve and a linear solenoid-type ISO valve can also be used. If there is a means for detecting the amount of adjustment such as a position/pressure sensor, there is no problem in applying the present invention.

This means that instead of idle air hI, the circulation amount of IJI gas (IE G l'? suspension) can be increased to 1.11 times the amount of IJI gas in the shield ring passage.
The above-mentioned configuration can be applied to the system of gas circulation, and the system in which the air-fuel ratio is feedback-controlled by J: to the valve means of the intake system. I'm excited.

1 Effect of Light 1 As explained in detail above, 1iC detects the operating state of an internal combustion engine and detects the flow rate of fluid taken into the engine.
a valve means for controlling by adjusting the frontage area; an adjustment amount detection means for detecting the adjustment of the frontage area of the valve means;
A target adjustment amount of the opening area of the valve means is calculated according to the internal combustion engine operating state detected by the operating state detection means, and the valve means is controlled based on the opening adjustment amount. an arithmetic control means that performs abnormality detection processing when a state in which the deviation amount between the adjustment amount detected by the adjustment amount detection means and the approximately 2 target adjustment continues for a predetermined time period or more; It is characterized by comprising a detection means.

Therefore, abnormal states of the valve means such as damage to the diaphragm or sticking of the valve body can be quickly detected, so abnormality detection processing such as fuel cut and display can be performed to stop the engine, thereby reducing the engine operating state to the safe side. It has the effect of being controllable.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the basic configuration of the present invention, and FIG. 2 is a diagram illustrating the basic configuration of the present invention. No fiddle rotation speed system 1 of the second embodiment
The schematic configuration diagram of the internal combustion engine closing ffl+ system including the III device, and Figure 3 are the same (detailed diagram of the ISO valve of the example,
Figure 4 is the same (block diagram of the power control circuit in the embodiment,
FIG. 5 is a flowchart 1 showing the control of the first embodiment, FIG. 6 is an explanatory diagram without showing the operation of the valve body, and FIG. 7 is a flowchart showing the control of the second embodiment. Figure 8 also shows four explanatory diagrams showing the operation of the valve body. 20...Electronic system ti11 circuit 31...Valve body 36.37...Solenoid valve agent Patent attorney Foot A'f Tsutomu GJ/Jl 1 person Figure 5 Figure 6 Figure 8)

Claims (1)

[Scope of Claims] An operating state detection means for an internal combustion engine, a valve means for controlling the flow rate of fluid taken into the engine by adjusting an opening area, and an adjustment amount for detecting the opening area adjustment amount of the valve means. a detection means; and a target adjustment amount of the opening area of the valve means is calculated according to the internal combustion engine operating state detected by the operating state detection means, and the valve means is controlled based on the target adjustment. and an abnormality detection process for performing an abnormality detection process when the deviation amount between the adjustment m detected by the adjustment M detection means and the target adjustment amount continues for a predetermined amount or more. A valve control device for an internal combustion engine, comprising: a detection means;