JPS606030A - Operational condition control method for internal- combustion engine - Google Patents

Abstract

PURPOSE:To satisfactorily control an engine operational condition, by equalizing a compensation value to a border value between a large coefficient region and a small coefficient region if it is judged that a sampling value belongs to the large coefficient region and that the compensation value belongs to the small coefficient region. CONSTITUTION:In calculation of a compensation value PBA, if it is judged that a present sampling value PBn belongs to a second region, (PBn+phi2) is computed to calculate the compensation value PBA. If PBA>Pr, that is, the compensation value PBA belongs to a first region, the compensation value PBA is equalized to a predetermined value Pr. Then, a desired basic injection time is indexed by a table from a data map of a basic injection time of an injector 15 corresponding to a basic fuel supply quantity which is preliminarily stored in ROM according to the compensation value PBA. Then, an injection time is compensated from the basic injection time according to information of coolant temperature and opening degree of a throttle valve 5, etc. to calculate the same, thereby controlling an operational condition of an engine 4. Accordingly, the compensation value is also changed similar to the sampling value, and there is no possibility of the compensation value being decreased during increase in the sampling value.

Description

[Detailed description of the invention] The present invention relates to a method for controlling the operating conditions of an internal combustion engine.

It is well known to control the operating state of the engine by detecting various operating parameters of an internal combustion engine and, based on the detected outputs, determining the fuel supply m, etc. that is appropriate for the operating state of the engine.

As a method of controlling the operating state, main operating parameters of the engine are detected by a sensor 1, and the detected output is sent to a predetermined period of 1 pulse or a TDC (top dead center) signal synchronized with engine rotation. The difference between the current 4 non-bling value and the sampling value before this sampling is multiplied by a coefficient, and the current sampling value is added to the multiplication result value to obtain a correction value, and based on the correction value. The present applicant has already proposed a method for controlling the operating state of the engine by determining the amount of fuel supplied to the engine based on the amount of fuel supplied to the engine.

The above coefficients are set to optimal values depending on the operating conditions. For example, if the sampled value area is divided into two areas, the first and second areas, depending on the operating condition, and the sampled value belongs to the first area, the coefficient ψ1 is used, and if the sampled value belongs to the second area, the coefficient ψ1 is used. There are C using different coefficients ψ2.

If a coefficient ψ1 corresponding to the first area is smaller than a coefficient ψ2 corresponding to the second area and the coefficient ψ1 corresponding to the second area is smaller than the coefficient ψ2 corresponding to the second area, then As shown in the figure, the ripple value is the second
changes from the region to the first region, η-2nd time and 1-1
Second sampling value △11-2. ΔII-1 belongs to the second region, n-th sampling 111■Δ11 belongs to the first region, and these sampling values and coefficients ψ1 or ψ2
The correction value is extracted by Then, the correction value Bn-2 of the sampling value An-2 belongs to the second area, and the correction value Bn-1 of the sampling ring 1 Δn-1 belongs to the first area. In addition, there is a case where the size of the correction value 13n-1 becomes 6 people due to the size of the correction value t3n. In this case, the change in the correction value is equal to the change of 1 non-pulling value and 5^, and the correction value decreases when the lean-pulling value is increasing, so that the engine cannot be controlled well.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for controlling the operating state of an engine by which the operating state of the engine can be controlled satisfactorily.

In the operating state control method of the first invention of the present application, if the current sampled value belongs to a region of large coefficients, it is determined whether the correction value belongs to a region of small coefficients; If it is determined that Ic belongs to a region of small coefficients, the correction value is set equal to a boundary value that separates regions of different coefficients.

In addition, in the operating state control method of the second invention of the present application, if the sampled value this time belongs to the range of coefficients, it is determined whether the correction value belongs to the range of small coefficients, and if the correction value is small. If it is determined that the coefficient belongs to the area with a coefficient of The first modification (11
4, and it is determined whether the first correction value belongs to the small coefficient area, and if it is determined that the first correction value belongs to the small coefficient area, the correction value is set to the boundary value. , and it is determined that the first correction value belongs to the region of small coefficients.
/j is characterized in that the correction value is set equal to the first correction value.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 2 to 5.
explain.

Embodiment 1 of the present invention shown in FIG. There are 41 sea urchins supplied to the engine 4 through the engine. A throttle valve 5 is provided in the intake passage 3, and the amount of air intake into each engine 4 changes depending on the opening degree of the throttle valve 5. A three-way catalyst 9 is installed in the exhaust path 8 of the engine 4 in order to promote the reduction of harmful components (C0,1-IC and NOx) in the j-no-1 gas.

On the other hand, numeral 10 is, for example, a potentiometer, and is a throttle angle sensor that generates an output voltage at a level corresponding to the opening degree of throttle valve ↑5. 12 is a cooling water temperature sensor that generates an output voltage at a level corresponding to the level of water depletion of the engine 4; 13 is a sensor that rotates the crankshaft (not shown) of the engine 4 at a predetermined rotation angle; This is a crank angle sensor that generates a pulse signal when 15 is an injector provided in the intake passage 3 near the intake valve (not shown) of the engine 4. The output terminals of the throttle range sensor 10, absolute pressure sensor 11, cooling water temperature sensor 12, and crank angle sensor 13 and the input terminal of the injector 15 are connected to a control circuit 16.

As shown in FIG. 3, the control circuit 16 includes a level correction circuit 21 that corrects each output level of the throttle 1 degree sensor 10, absolute pressure sensor 11, and water temperature sensor 12, and each sensor output that passes through the level correction circuit 21. an input signal switching circuit 22 that selectively outputs one of the
An A/D converter 23 that converts the output Ano-1 cog signal into a digital signal, a waveform shaping circuit 24 that shapes the output of the crank angle sensor 13, and a waveform shaping circuit 2.
4, a drive circuit 26 that drives the injector 15, and a CPU (central control circuit) 27 that performs digital control operation according to the program. , a ROM 2Q in which various processing programs are stored, and a RAM 29. Input signal switching circuit 22, A/D converter 2
3, J counter 25, drive circuit 26, CPU 27, RO
M2B and RAM 29 are connected by an input/output bus 30.

The TDC signal is supplied from the round waveform shaping circuit 24 to the CPU 27.

In the 414 configuration J5, information on the throttle valve opening, intake air pressure and cooling water mud is alternatively sent from the A/D converter 23, and information on the engine speed from the counter 25 is sent to the CPU.
27 via a noco bus 30. R
The OM 28 stores in advance the CPU 27's cotton drawing blockogram and various data, and the CPU 27 reads the above information according to this drawing program, and synchronizes with the UTDC Shingetsu based on that information. Fuel supply to the engine 4 from a predetermined formula 1ii) Calculate the fuel injection time of the GL compatible injector 15. Then, the drive circuit 26 drives the injector 15 only during the fuel injection interval to supply fuel to the engine 4.

Next, the procedure of the operating state control method according to the first invention of the present application, which is executed by the control circuit 1G, will be explained according to the diagram F-1 in FIG.

In this procedure, first, the 1-DCC signal is synchronized.℃゛△
/ [] The intake absolute pressure PBA is sampled from the converter 23 and read into the CPU 27 as a combining value Pen (step 51), and the sampling 1 direct PBn is stored in the RAM 29 for the calculation at the current TDC (f). It is stored in the RAM 29 (step 52) and also stored in the RAM 29 for use in the next IDc signal (step 53).
. After this, the previous sampling value Pen-1 is stored in the RAM29.
54), and the current limp ring value Pen is the first one with a different coefficient when calculating the correction value PBA.
Detecting whether it belongs to the area or the second area. Finally, it is determined whether the current sampling value P81) belongs to the second area or not (step 55). The '1st and second regions are divided into C with a predetermined value pr as a boundary, and the first region has a larger value range than the second region, and the coefficient ψ corresponding to the first region
1 is smaller than the coefficient ψ corresponding to the second region. In step 55, if it is determined that the non-pulling value Pon belongs to the first area, the current sampling value Pe'
The difference between n and the previous sampling value Pen-1 is multiplied by a coefficient ψ1, and the resultant value is the current υ sampling value POn.
is added to calculate the correction value PeA<=Pen4−ψ1(Pen
-1] B n-1) ) (step 56),
.

On the other hand, if it is determined that the current sampling value pB++ belongs to the second region, use the coefficient ψ2 to set P in the same way as when determining that it belongs to the first region1) 10Φ2 (Pt, Jn-P
o Il-1) by calculating the complementary iE value P c
Δ is calculated (step 57). , when the correction value 11T P B A @Di is issued in step 57, the correction value PB8 becomes the predetermined value PrJ:riman (it is determined whether or not il'J), Pa A >PI'
If the correction value PBA falls within the first region, the correction value PBA is made equal to the predetermined value Pr (5 steps).

Next, based on the correction value PBA calculated in J:, a desired basic injection time is table indexed from the data map of the basic injection time of the injector 15 corresponding to the basic fuel supply amount stored in the ROM 28 in advance. Then, the fuel injection time is calculated by correcting the desired basic injection time using information such as the cooling water temperature and the opening degree of the throttle valve 5 (step 60).
. In this way, the above procedure is repeated in sequence to control the operating state of the engine 4. Note that in step 58, PB
If A≦P'1J, that is, the correction value PBA belongs to the second region, the correction value PEA calculated in step 57 is used in step 60.

FIG. 5 shows the procedure of an embodiment of the second invention of the present application.

If this procedure is correct (only regarding the part A3 that differs from FIG. 4), then in step 55 the current sampling value Ps
If it is determined that n belongs to the second region, Pen+ψ2
(Pe II -Pa n-1> is calculated, and the calculation result is taken as a second correction value Pa82 (step 61). Is the second correction 1lTi P BΔ2 a predetermined value PrJ: a value that becomes a person? Please judge whether or not.Tsub62), P8
If A2≦Pr, make the correction value 1〕1]8 equal to the second correction value (step 63) 11-”', P+3A2>P
If r, P[+ 114−ψ+
(PBn -Ps Tl-1), and the result of the calculation is calculated as a first correction value PQ△1 (step 64). Next, it is determined whether the first correction value PeΔ1 is a value greater than a predetermined value (step 65), Pe A
If I > pr, correct (make lI'JPB8 equal to the first correction value PeA+, step 66), P13AI≦P
If r, make the correction +10PBA equal to the predetermined value Pr (
Step 67). That is, in J3 of this embodiment, if the current sampling value Pen belongs to the second area and the second correction value PBA2 based on the coefficient Φ2 of the current limbering value PBn belongs to the first area, the first correction value PBA2 based on the coefficient ψ1 Modified value P
If e A 1 is calculated and the first correction value PBA+ belongs to the second region, the correction value PBA becomes the predetermined fltfPr.
9 and the first correction value Pe A I belongs to the first area, the correction value 1] BA is the first correction value Pa A I
is set equal to

As described above, in the method for controlling the manufacturing state of an internal combustion engine according to the present invention, the sampling value is corrected for each numbering of the detected output of the engine operating parameter using a predetermined calculation formula using coefficients, and the engine control is based on the When determining the correction value to be, it is divided by the boundary value /, : The coefficients of the first and second regions C are ! Ili! If the IC correction value calculated from the sampled values belonging to the second region of coefficients exceeds the boundary value and succumbs to the first region of small coefficients, the correction value is set equal to the boundary value. 1, and if the correction value calculated from the sampling value belonging to the second region of large coefficients exceeds the boundary value and belongs to the first region of small coefficients, then use the small coefficient l [correction value The value obtained by the sieve formula is calculated as the first correction value, and if the first correction value belongs to the second area, the correction value is set equal to the boundary (1r1, and the first correction value is set equal to the first correction value). [belonging to the area], :, the correction value is set equal to the first correction value.Therefore, when the sampling value changes from the second area to the first area, j3 is set equal to the boundary value of the first area. This prevents the correction value of the previous sampling value belonging to the second area from becoming larger than the correction value of the current ringing value belonging to the first area, and the correction value as shown in FIG. (・
...13++-2, Bn-1, Bn...
) is also the sampling value 〈...Ato2. △1-1.
The correction value changes in the same way as An...), and the correction value does not decrease once. Therefore, engine control can be performed appropriately and driving performance can be improved.

Note that the operating state control method of the present invention is applicable not only to the case where the intake absolute pressure is used as an operating parameter as in the above embodiment, but also to the case where the operating state of the engine is controlled using other operating parameters other than the intake absolute pressure. It can be done. In addition, as in the above embodiment, the correction ("1 sieve use" has two regions of zumbling values with different coefficients, but it can also be applied when there are three or more regions with different coefficients. It is.

[Brief explanation of the drawing]

Figure 1 shows the relationship between the numbering value and the correction value.
Fig. 2 is a block diagram showing electronically controlled fuel supply control to which the operating state control method according to the present invention is applied, Fig. 3 is a specific block diagram of the control circuit during installation of Fig. 2, and Fig. 4 is a block diagram of the control circuit according to the present invention. Fig. 5 is an operation flow diagram of the control circuit showing an embodiment of the invention in Fig. 1;
The figure shows the operation flow diagram of the control I1 circuit showing the embodiment of the second invention of the present application. It is a diagram. Explanation of symbols of main parts 2... T cleaner 3... Intake path 5... Throttle valve 8...
...11) Air passage 9...Three-way catalyst 10...
... Throttle degree sensor 11 ... Absolute pressure sensor 12 ... Water temperature range 13 ... Crank angle sensor 15 ... Injector applicant Honda Gi1iJl Industries Agent Co., Ltd. Ben PL+shi Motohiko Fujitoshi

Claims (1)

[Scope of Claims] (1) Detecting an operating parameter of an internal combustion engine, sampling the detected output, and determining which of two regions the currently sampled value belongs to, which is separated by 7c according to at least one boundary value, The difference between the current sampling value and the sampling value before the current sampling is multiplied by coefficients that are different from each other corresponding to the area of the discrimination result, and the current sampling value is added to the east line result value to obtain a correction value, and the correction is performed. An operating state control method for controlling the operating state of an engine by determining a control value based on a value, wherein if the current sampling value belongs to a region of a large coefficient, the correction value belongs to an region of a small coefficient. Determine whether it is a value,
An operating state control method characterized in that when it is determined that the correction value belongs to a region with a small coefficient, the correction value is made equal to the boundary value. (2) Detecting the operating parameters of the internal combustion engine, sampling the detection nozzle, determining which of two regions the currently sampled value belongs to separated by at least one boundary value, and determining the region of the determination result. The difference between the current υ combining value and the sampling value before the current sampling is multiplied by coefficients that are different from each other corresponding to the current sampling value. This is an operating state control method for controlling and overturning the operating state of an engine by determining a control till value, and in which the correction value is a small coefficient if the current 1 numbering (Po1 belongs to the range of coefficients). It is determined whether the value belongs to the region, and if it is determined that the correction value belongs to the region of small coefficients, the small coefficient is used as the current lean pulling value and the current sampling J: previous sampling. Multiply the difference between the values and the formwork result value by adding the current 1 number I
)'' adjustment value to a first modified value, determine whether the first modified value belongs to the small coefficient region, and determine whether the first modified value belongs to the small coefficient region. If it is determined that the first correction value belongs to a region with a small coefficient, the correction value is made equal to the boundary value, and if it is determined that the first correction value belongs to a region with a small coefficient, the correction value is A method for controlling an operating state, which causes !l11 to be equal to a first modified value.