JP2962532B2 - Ignition advance inference device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition advancing inference device for obtaining an ignition advancing angle and supplying the same to an ignition control device for use in controlling an ignition device disposed in an engine cylinder. Fuzzy set between the fuzzy set for the intake manifold pressure, the fuzzy set for the exhaust gas oxygen concentration, and the fuzzy set for the ignition advance angle is applied to the change in the cylinder pressure during combustion and the previous correction amount of the fuzzy rule. The present invention relates to an ignition advancing inference device that obtains an ignition advancing angle while correcting based on a current correction amount of a fuzzy rule determined accordingly.

[0003]

2. Description of the Related Art Heretofore, as this type of ignition advancing inference device, an ignition advancing inference device 20 as shown in FIG. 10 has been proposed.

That is, in the conventional ignition advancing inference device 20 , first, a fuzzy set relating to the engine speed, a fuzzy set relating to the amount of air supplied to the combustion chamber (ie, cylinder) of the engine, and the combustion chamber of the engine are provided.
(I.e., a fuzzy set concerning the oxygen concentration in the air supplied to the cylinder), a fuzzy set concerning the oxygen concentration in the exhaust gas, and a fuzzy set concerning the oxygen concentration in the combustion chamber (i.e., the cylinder) of the engine. The engine speed detected by the engine speed detection sensor 21 and the combustion chamber of the engine detected by the air supply amount detection sensor 22 based on the fuzzy rule 1
(I.e., the amount of air supplied to the cylinder) and the oxygen concentration in the air supplied to the combustion chamber (i.e., the cylinder) of the engine detected by the oxygen concentration detection sensor 23 and the exhaust gas oxygen concentration detection sensor 24. Oxygen concentration inference circuit according to the detected oxygen concentration in exhaust gas
At 31 fuzzy inference was used to determine the oxygen concentration in the combustion chamber (ie, cylinder) of the engine.

In the conventional ignition advancing inference device 20 ,
A second fuzzy set between the fuzzy set relating to the oxygen concentration in the combustion chamber (ie, cylinder) of the engine, the fuzzy set relating to the amount of fuel supplied to the combustion chamber (ie, cylinder) of the engine, and the fuzzy set relating to the λ value.
Based on the fuzzy rules of the above, the oxygen concentration in the engine combustion chamber (i.e., cylinder) determined by the oxygen concentration inference circuit 31 and the oxygen concentration in the engine combustion chamber (i.e., cylinder) detected by the fuel supply amount detection sensor 25 are supplied. The λ value has been obtained by the λ value inference circuit 32 by fuzzy inference according to the supplied fuel supply amount.

In the conventional ignition advancing inference device 20 , λ
The λ value obtained by the λ value inference circuit 32 and detected by the engine speed detection sensor 21 based on a third fuzzy rule established between the fuzzy set relating to the value, the fuzzy set relating to the engine speed, and the fuzzy set relating to the load. Load inference circuit 33 according to the
The load applied to the engine was determined by fuzzy inference.

In the conventional ignition advancing inference device 20 , in addition,
The load and the engine speed obtained by the load inference circuit 33 based on the fourth fuzzy rule which is established among the fuzzy set for the load, the fuzzy set for the engine speed, the fuzzy set for the knocking information, and the fuzzy set for the advance angle. In accordance with the engine speed detected by the detection sensor 21 and the knocking information detected by the knocking detection sensor 26, the ignition advance angle is determined by the ignition advance inference circuit 34 by fuzzy inference.

In the conventional ignition advancing inference device 20 , finally,
The ignition time detected by the ignition time detection device (not shown) is corrected from the crank angle detected by the crank angle detection sensor (not shown) according to the advance angle obtained by the ignition advance inference circuit 34. At the determined corrected ignition time, an ignition control signal is generated by an ignition control device (not shown), and the ignition control signal is determined by a cylinder determination device (not shown) from cylinder information detected by a cylinder detection sensor (not shown). It was given to an ignition device (not shown) attached to the cylinder.

[0009]

[Problems to be Solved] Therefore, in the conventional ignition advancing inference device 20 , the oxygen concentration inference circuit 31 uses the combustion chamber of the engine.
The oxygen concentration in the cylinder (i.e., cylinder) is determined by fuzzy inference, and the λ value is inferred by the λ value inference circuit 32 using the oxygen concentration in the combustion chamber (i.e., cylinder) of the engine determined by the oxygen concentration inference circuit 31. And λ
Load inference circuit using the λ value obtained by the value inference circuit 32
The load applied to the engine is obtained by fuzzy inference at 33, and the ignition advance angle is obtained by fuzzy inference at the ignition advance inference circuit using the load applied to the engine obtained by the load inference circuit. Therefore, there is a disadvantage that (i) the fuzzy inference must be executed at at least four places in order to obtain the ignition advance angle, which is complicated. (Ii) There is a disadvantage that the execution circuit of the fuzzy inference is complicated. together
(iii) The fuzzy inference has a drawback that requires a lot of time, and as a result, (iv) has a drawback in that it is not possible to achieve downsizing or cost reduction, and it is not possible to secure immediacy of ignition control.

In the conventional ignition advancing inference device 20 , an oxygen concentration inference circuit 31, a λ value inference circuit 32, a load inference circuit 33, and an ignition circuit are constructed according to a fuzzy rule constructed based on a result of analyzing the combustion state of the engine in advance. Since the fuzzy inference is executed in each of the lead angle inference circuits 34, there is a drawback that (v) the fuzzy rule is complicated, and (vi) that it takes a long time to construct the fuzzy rule.

In order to eliminate these drawbacks, the present invention provides a fuzzy set for the engine speed, a fuzzy set for the intake manifold pressure, a fuzzy set for the exhaust gas oxygen concentration, and a fuzzy set for the ignition advance. An ignition advancing inference device that obtains an ignition advancing angle while correcting the fuzzy rule that is satisfied based on the change in cylinder pressure during combustion and the current correction amount of the fuzzy rule determined according to the previous correction amount of the fuzzy rule. It will not be provided.

[0012]

Configuration of the Invention

[0013]

A solution to the problem provided by the present invention is as follows.
In an ignition advancing inference device for controlling an ignition device arranged in a cylinder of an engine, (a) a change in cylinder pressure during combustion detected by a cylinder pressure detection sensor (14) is obtained, and (i) When the pressure in the cylinder increases, the ignition advance angle of the fuzzy rule is increased when the previous correction amount of the fuzzy rule is positive, and the ignition advance angle of the fuzzy rule is decreased when the previous correction amount of the fuzzy rule is negative, and (ii)
When the pressure in the cylinder decreases, the ignition advance angle of the fuzzy rule is reduced when the previous correction amount of the fuzzy rule is positive,
And a fuzzy rule correction amount determination circuit (16) for determining and outputting the current correction amount of the fuzzy rule so as to increase the ignition advance angle of the fuzzy rule when the previous correction amount of the fuzzy rule is negative, and (b) A fuzzy set which is established between a fuzzy set related to the engine speed, a fuzzy set related to the intake manifold pressure, a fuzzy set related to the exhaust gas oxygen concentration, and a fuzzy set related to the ignition advance, and output from the correction amount determining circuit (16) of the fuzzy rule. The engine speed detected by the engine speed detection sensor (11), the intake manifold pressure detected by the intake manifold pressure detection sensor (12), and the exhaust gas oxygen are based on the fuzzy rule corrected according to the current correction amount of the rule. Concentration detection sensor (1
An ignition advance inference circuit (15) for obtaining an ignition advance by fuzzy inference according to the exhaust gas oxygen concentration detected by 3). .

[0014]

The ignition advancing inference device according to the present invention determines the ignition advancing angle and gives it to the ignition control device as set forth in the above-mentioned "Means for Solving the Problems", and is provided in the cylinder of the engine. An ignition advancing inference device used for controlling an ignition device, particularly when (a) a change in cylinder pressure during combustion detected by a cylinder pressure detection sensor is determined, and (i) a cylinder pressure increases. When the previous correction amount of the fuzzy rule is positive, the ignition advance angle of the fuzzy rule is increased, and when the previous correction amount of the fuzzy rule is negative, the ignition advance angle of the fuzzy rule is decreased, and (ii) the cylinder pressure is increased. In the case of a decrease, when the previous correction amount of the fuzzy rule is positive, the ignition advance angle of the fuzzy rule is decreased, and when the previous correction amount of the fuzzy rule is negative, the ignition advance angle of the fuzzy rule is increased. (B) fuzzy set for engine speed, fuzzy set for intake manifold pressure, fuzzy set for exhaust gas oxygen concentration, and fuzzy set for ignition advance The engine speed detected by the engine speed detection sensor and the intake manifold based on the fuzzy rule that has been established between the set and is corrected in accordance with the current correction amount of the fuzzy rule output from the fuzzy rule correction amount determination circuit. An ignition advancing inference circuit for obtaining an ignition advancing angle by fuzzy inference according to the intake manifold pressure detected by the pressure detection sensor and the exhaust gas oxygen concentration detected by the exhaust gas oxygen concentration detection sensor. (I) Fuzzy rules for fuzzy inference of ignition advance The function of automatically updating based on the change in the pressure in the cylinder and the previous correction amount of the fuzzy rule, and thus (ii) the function of simplifying the fuzzy rule for fuzzy inference of the spark advance and (iii) the spark advance (F) reduces the time required to construct fuzzy rules for fuzzy inference, (iv) speeds up fuzzy inference by simplifying the execution circuit of fuzzy inference, and (v) reduces fuzzy inference. To improve the fuzzy rules with the operation of the engine, and consequently (vi) to achieve miniaturization or cost reduction and to ensure the immediateness of ignition control, and (vii) to improve combustion efficiency To act.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of an ignition advancing inference device according to the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments described below are:
It is described for the purpose of facilitating or facilitating the understanding of the present invention and is not described for limiting the present invention.

In other words, each element disclosed in the embodiments described below includes all design changes and equivalent replacements that fall within the spirit and scope of the present invention.

(Attached drawing)

FIG. 1 is a block circuit diagram for commonly showing first to fourth embodiments of the ignition advancing inference device according to the present invention.

FIG. 2 is a graph for explaining the operation of the first to fourth embodiments shown in FIG. 1. In particular, FIG. 2 shows a fuzzy set used in fuzzy inference in the ignition advance inference circuit 15. An example is shown.

FIG. 3 is a graph for explaining the operation of the first and second embodiments shown in FIG. 1. In particular, FIG. 3 shows a fuzzy set used in fuzzy inference in the ignition advance inference circuit 15. An example is shown.

FIG. 4 is a graph for explaining the operation of the first to fourth embodiments shown in FIG. 1, and particularly shows an example of fuzzy inference in the ignition advance inference circuit 15.

FIG. 5 is a graph for explaining the operation of the first embodiment shown in FIG. 1, and particularly shows an example of fuzzy inference in the ignition advance inference circuit 15.

FIG. 6 is a graph for explaining the operation of the second embodiment shown in FIG. 1. In particular, FIG. 6 shows an example of fuzzy inference in the ignition advance inference circuit 15.

FIG. 7 is a graph for explaining the operation of the third and fourth embodiments shown in FIG. 1. In particular, FIG. 7 shows a fuzzy set used in fuzzy inference in the ignition advance inference circuit 15. An example is shown.

FIG. 8 is a graph for explaining the operation of the third embodiment shown in FIG. 1, and particularly shows an example of fuzzy inference in the ignition advance inference circuit 15.

FIG. 9 is a graph for explaining the operation of the fourth embodiment shown in FIG. 1, and particularly shows an example of fuzzy inference in the ignition advance inference circuit 15.

(Configuration of First to Fourth Embodiments)

First, with reference to FIG. 1, first to fourth embodiments of the ignition advance inference device according to the present invention will be described.
The configuration will be described in detail.

Numeral 10 denotes an ignition advancing inference device according to the present invention, which is the number of revolutions of the engine output shaft per unit time.
(Referred to as “engine speed”) and an intake manifold pressure for detecting pressure in an intake manifold provided to the cylinder (referred to as “intake manifold pressure”). Detection sensor 1
2, an exhaust gas oxygen concentration detection sensor 13 for detecting the oxygen concentration in the exhaust gas discharged from the cylinder, and a cylinder pressure detection sensor 14 for detecting the cylinder pressure during combustion. .

The ignition advancing inference device 10 according to the present invention has an input terminal connected to the in-cylinder pressure detection sensor 14 and detects the in-cylinder pressure during combustion detected by the in-cylinder pressure detection sensor 14. The storage device 15 for holding the detection result is connected to the in-cylinder pressure detection sensor 14 and the storage device 15 so that the change in the detection result of the in-cylinder pressure and the fuzzy rule A fuzzy rule correction amount determination circuit 16 for determining and outputting the correction amount this time is provided.

The ignition advancing inference device 10 according to the present invention further includes an engine speed detecting sensor 11, an intake manifold pressure detecting sensor 12, an exhaust gas oxygen concentration detecting sensor 13, and a fuzzy rule correction amount determining circuit 16. Connected, and after correcting the consequent part of the fuzzy rule according to the current correction amount of the fuzzy rule given from the fuzzy rule correction amount determination circuit 16, the engine speed given from the engine speed detection sensor 11 The ignition advance angle is obtained by fuzzy inference according to the detection result of the intake manifold pressure detected by the intake manifold pressure detection sensor 12 and the detection result of the exhaust gas oxygen concentration supplied by the exhaust gas oxygen concentration detection sensor 13 And an ignition advancing inference circuit 17.

(Operation of the First Embodiment)

Further, with reference to FIGS. 1 to 5, a first embodiment of the ignition advance inference device according to the present invention will be described.
The operation will be described in detail.

If generalization of the operation of the fuzzy rule correction amount determination circuit 16 and the ignition advance inference circuit 17 is accompanied by a great deal of complexity, it is provided by the engine speed detection sensor 11 here. The detection result of the detected engine speed, the detection result of the intake manifold pressure provided from the intake manifold pressure detection sensor 12, the detection result of the exhaust gas oxygen concentration provided from the exhaust gas oxygen concentration detection sensor 13, and the cylinder pressure detection sensor 14 The detection results of the in-cylinder pressure at the time of combustion given by are given as examples shown in Table 1, respectively.

[0036]

[Table 1]

Determination of Fuzzy Rule Correction Amount

The correction amount of the fuzzy rule is determined in the fuzzy rule correction amount determination circuit 16 as follows.

That is, a fuzzy rule correction amount determining circuit
16 is the detection result of the cylinder pressure during combustion given from the cylinder pressure detection sensor 14 (that is, the current detection value)
Is compared with the previous detection value given from the storage device 15 and the correction amount for the ignition advance of the consequent part in the fuzzy rule shown in Table 3 according to the previous correction amount of the fuzzy rule (that is, the current correction amount of the fuzzy rule) ) Is determined as shown in Table 2.
Here, it is preferable that the detection of the in-cylinder pressure during combustion by the in-cylinder pressure detection sensor 14 is performed for each combustion in the cylinder.

[0040]

[Table 2]

"+1" in Table 2 means that the ignition advance of the consequent part in the fuzzy rule is increased by a predetermined amount (for example, "only one larger membership function"). Further, "-1" in Table 2 means that the ignition advance angle of the consequent part in the fuzzy rule is reduced by a predetermined amount (for example, "only one smaller membership function").

Here, a description will be given assuming that the present detection value of the cylinder pressure is greater than the previous detection value, and the previous correction amount of the fuzzy rule is "+1". In this case, as is clear from Table 2, the current correction amount of the fuzzy rule is “+1 (here,“ one large membership function is assumed ”)”. Incidentally, when the current correction amount is "+1", the largest membership function S _35, because it is anticipated that allowed to deteriorate the inferred value of the ignition advance in spark advance inference circuit 17, it will not be corrected . Also, when the correction amount is “−1”, the smallest membership function S ₁₇ is expected to deteriorate the estimated value of the ignition advance in the ignition advance inference circuit 17. Never.

Inference of ignition advance

The ignition advance angle is obtained by fuzzy inference in the ignition advance inference circuit 17 as follows.

That is, the ignition advance inference circuit 17
A fuzzy set relating to the engine speed (for example, fuzzy set A in FIG. 2A) and a fuzzy set relating to the intake manifold pressure (for example, FIG. (b), a fuzzy set relating to the exhaust gas oxygen concentration (for example, fuzzy set C of FIG. 2 (c)) and a fuzzy set relating to the ignition advance (for example, fuzzy set D of FIG. 3). the spark advance at the consequent part of the fuzzy rule (e.g. fuzzy rule f ₁ ~f ₁₉ shown in Table 3), is corrected as shown in Table 4. Here, all fuzzy rules having a membership function that has a contribution with respect to the engine speed and the intake manifold pressure (that is, the grade is not 0) are to be corrected. Fuzzy rule to be corrected, as is evident from Table 1 and FIG. 2 (hence Figure 4), fuzzy rule f ₅ ~f in Table 3 _7; is f _18; f ₉ ~f _11.

[0046]

[Table 3]

[0047]

[Table 4]

Thereafter, the ignition advancing inference circuit 17 generates a fuzzy set relating to the engine speed (here, a fuzzy set A in FIG. 2A) and a fuzzy set relating to the intake manifold pressure (here, a fuzzy set A in FIG. 2B). Set B), a fuzzy set related to exhaust gas oxygen concentration (here, fuzzy set C in FIG. 2C) and a fuzzy set related to ignition advance (here, fuzzy set D in FIG. 3), and corrected as described above. based on been fuzzy rule (fuzzy rule f ₁ ~f ₁₉ shown in Table 4 in this case), given from the intake and the detection result of the engine rotational speed given from the engine speed sensor 11 manifold pressure detecting sensor 12 According to the detection result of the intake manifold pressure and the detection result of the exhaust gas oxygen concentration given from the exhaust gas oxygen concentration detection sensor 13, the ignition advance angle is inferred by fuzzy inference. The seek. Hereinafter, the fuzzy inference in the ignition advance inference circuit 17 will be described with reference to FIGS.
An example will be described as being executed based on the fuzzy rules f _{1 to} f ₁₉ shown in Table 4 which are established between (c) and the fuzzy sets A to D shown in FIG. Therefore, in the present invention, if desired, (i) the number of membership functions included in each of the fuzzy sets A to D may be increased or decreased, or the shape thereof may be changed, and (ii) the fuzzy rule f
To increase or decrease the number of ₁ ~f _19, or may change its contents.

[0049]

[Table 5]

Based on Table 1, FIG. 2 and FIG. 3, the ignition lead angle inference circuit 17 determines the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration in the fuzzy rules f _{1 to} f ₁₉ in Table 4. (I.e., grade) is determined as shown in FIG.

Thereafter, the ignition advance inference circuit 17 determines the contribution (ie, grade) of each of the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration for each of the fuzzy rules f _{1 to} f _19. Compared, the smallest one of them is the contribution of membership function of ignition advance (that is, grade) as shown in Table 5.
And

The ignition advance inference circuit 17 further converts the membership functions of the ignition advance with respect to the fuzzy rules f _{1 to} f ₁₉ into trapezoidal membership functions cut at the grade positions specified in Table 5, respectively. (See FIG. 5).

The ignition lead angle inference circuit 17 calculates the trapezoidal membership functions S ₂₆ ^{* 5} , S ₂₃ ^{* 6} , S ₂₁ ^{* 7} , S
^{_{31 * 9, S 26 * 10}} , S 24 * 11, the S ₃₅ ^{* 19} with enclosed hatched area to calculate the center of gravity as shown in FIG. 5, to infer the abscissa 26.11 degrees and spark advance.

The ignition advancing inference circuit 17 finally outputs the inferred value of the ignition advancing angle, 26.11 degrees, to a subsequent ignition control device (not shown) for use in ignition control of the engine.

(Operation of the Second Embodiment)

The operation of the second embodiment of the ignition advancing inference apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 4 and FIG.

Determination of Fuzzy Rule Correction Amount

The fuzzy rule correction amount is determined in the fuzzy rule correction amount determination circuit 16 in the same manner as in the first embodiment.

Inference of ignition advance

The ignition advance angle is obtained by fuzzy inference in the ignition advance inference circuit 17 as follows.

That is, first, the ignition advance inference circuit 17
According to the current correction amount of the fuzzy rule provided from the fuzzy rule correction amount determination circuit 16, a fuzzy set relating to the engine speed (here, fuzzy set A in FIG. 2 (a)) and a fuzzy set relating to the intake manifold pressure (here, The fuzzy set B of FIG. 2 (b), the fuzzy set of exhaust gas oxygen concentration (here, fuzzy set C of FIG. 2 (c)) and the fuzzy set of ignition advance (here, fuzzy set D of FIG. 3). fuzzy rule (here, the fuzzy rules f ₁ ~f ₁₉ shown in Table 3) that holds between the spark advance in a consequent part of, corrects as in Table 6. Here, the contribution ratios for the engine speed and intake manifold pressure
The fuzzy rule with the largest membership function (ie, grade) is subject to correction. Fuzzy rule to be corrected, as is evident from Table 1 and FIG. 2 (hence Figure 4) is a fuzzy rule f ₆ in Table 3.

[0062]

[Table 6]

After that, the ignition advance inference circuit 17 generates a fuzzy set relating to the engine speed (here, a fuzzy set A in FIG. 2A) and a fuzzy set relating to the intake manifold pressure (here, a fuzzy set A in FIG. 2B). Set B), a fuzzy set related to exhaust gas oxygen concentration (here, fuzzy set C in FIG. 2C) and a fuzzy set related to ignition advance (here, fuzzy set D in FIG. 3), and corrected as described above. Based on the obtained fuzzy rules (here, fuzzy rules f _{1 to} f ₁₉ shown in Table 6), the detection result of the engine speed given from the engine speed detection sensor 11 and the result given from the intake manifold pressure detection sensor 12 are given. According to the detection result of the intake manifold pressure and the detection result of the exhaust gas oxygen concentration given from the exhaust gas oxygen concentration detection sensor 13, the ignition advance angle is inferred by fuzzy inference. The seek. Hereinafter, the fuzzy inference in the ignition advance inference circuit 17 will be described with reference to FIGS.
exemplarily be described as being performed on the basis of the fuzzy rule f ₁ ~f ₁₉ shown in Table 6 that holds between the fuzzy set A~D shown in (c) and FIG. Therefore, in the present invention, if desired, (i) the number of membership functions included in each of the fuzzy sets A to D may be increased or decreased, or the shape thereof may be changed, and (ii) the fuzzy rule f
To increase or decrease the number of ₁ ~f _19, or may change its contents.

[0064]

[Table 7]

Based on Table 1, FIG. 2 and FIG. 3, the ignition advance inference circuit 17 determines the membership functions of the engine speed, the intake manifold pressure and the exhaust gas oxygen concentration in the fuzzy rules f _{1 to} f ₁₉ in Table 6. (That is, grade) is determined as shown in FIG.

The ignition advancing inference circuit 17 then determines the contribution (ie, grade) of each of the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration for each of the fuzzy rules f _{1 to} f _19. Comparison, and the smallest one of them is shown in Table 7 as shown in Table 7.
And

The ignition advance inference circuit 17 further converts each membership function of the ignition advance with respect to the fuzzy rules f _{1 to} f ₁₉ into a trapezoidal membership function obtained by cutting each of the membership functions at the grade position specified in Table 7. (See FIG. 6).

The ignition advance inference circuit 17 calculates the trapezoidal membership functions S ₂₅ ^{* 5} , S ₂₃ ^{* 6} , S ₂₀ ^{* 7} , S
^{_{30 * 9, S 25 * 10}} , S 23 * 11, the S ₃₅ ^{* 19} with enclosed hatched area to calculate the center of gravity as shown in FIG. 6, to infer the abscissa 25.45 degrees and spark advance.

The ignition advancing inference circuit 17 finally outputs the inferred value of the ignition advancing angle of 25.45 degrees to a subsequent ignition control device (not shown) for use in ignition control of the engine.

(Operation of Third Embodiment)

The operation of the third embodiment of the ignition advancing inference apparatus according to the present invention will be described in detail with reference to FIGS. 1, 2, 4, 7 and 8.

Determination of Fuzzy Rule Correction Amount

The correction amount of the fuzzy rule is determined by the fuzzy rule correction amount determination circuit 16 as in the first embodiment.

Inference of spark advance

The ignition advance angle is obtained by fuzzy inference in the ignition advance inference circuit 17 as follows.

That is, the ignition advance inference circuit 17
According to the current correction amount of the fuzzy rule provided from the fuzzy rule correction amount determination circuit 16, a fuzzy set relating to the engine speed (here, fuzzy set A in FIG. 2 (a)) and a fuzzy set relating to the intake manifold pressure (here, The fuzzy set B of FIG. 2 (b), the fuzzy set of the exhaust gas oxygen concentration (here, the fuzzy set C of FIG. 2 (c)) and the fuzzy set of the ignition advance (here, the fuzzy set E of FIG. 7). fuzzy rule (here, the fuzzy rules g ₁ to g ₁₉ shown in Table 8) that holds between the spark advance in a consequent part of, corrects as in Table 9. Here, all fuzzy rules having a membership function that has a contribution with respect to the engine speed and the intake manifold pressure (that is, the grade is not 0) are to be corrected. Fuzzy rule to be corrected, as is evident from Table 1 and FIG. 2 (hence Figure 4), the fuzzy rules in Table 8 g ₅ ~g _7; a g _18; g ₉ ~g _11.

[0077]

[Table 8]

[0078]

[Table 9]

After that, the ignition advance inference circuit 17 generates a fuzzy set relating to the engine speed (here, a fuzzy set A in FIG. 2A) and a fuzzy set relating to the intake manifold pressure (here, a fuzzy set A in FIG. 2B). Set B), a fuzzy set related to exhaust gas oxygen concentration (here, fuzzy set C in FIG. 2C) and a fuzzy set related to ignition advance (here, fuzzy set E in FIG. 7), and corrected as described above. based on been fuzzy rule (fuzzy rule g ₁ to g ₁₉ shown in Table 9 in this case), given from the intake and the detection result of the engine rotational speed given from the engine speed sensor 11 manifold pressure detecting sensor 12 According to the detection result of the intake manifold pressure and the detection result of the exhaust gas oxygen concentration given from the exhaust gas oxygen concentration detection sensor 13, the ignition advance angle is inferred by fuzzy inference. The seek. Hereinafter, the fuzzy inference in the ignition advance inference circuit 17 will be described with reference to FIGS.
(c) and the fuzzy set A~C shown in FIG. 7 will be exemplified as being performed on the basis of the fuzzy rule g ₁ to g ₁₉ shown in Table 9 established between the E. Therefore, in the present invention, if desired, (i) fuzzy sets A to C,
The membership function included in E may be increased or decreased, or its shape may be changed. (Ii) The fuzzy rules g ₁ to
to increase or decrease the number of g _19, or may change its contents.

[0080]

[Table 10]

Based on Table 1, FIG. 2 and FIG. 7, the ignition advance inferring circuit 17 is a membership function of the engine speed, the intake manifold pressure and the exhaust gas oxygen concentration in the fuzzy rules g _{1 to} g ₁₉ in Table 9. (That is, grade) is determined as shown in FIG.

Thereafter, the ignition advance inference circuit 17 determines the contribution (ie, grade) of each of the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration for each of the fuzzy rules g _{1 to} g _19. Then, the smallest one of them is defined as the contribution (that is, grade) of the membership function of the spark advance as shown in Table 10.

The ignition advance inference circuit 17 uses the fuzzy rule g ₁
With respect to ｇg ₁₉ , each membership function of the spark advance is transformed into a trapezoidal membership function cut at the grade position specified in Table 10 (see FIG. 8).

The ignition advance inference circuit 17 calculates the trapezoidal membership functions S ₂₉ ^{* 5} , S ₂₆ ^{* 6} , S ₂₃ ^{* 7} , S
^{_{32 * 9, S 29 * 10}} , S 26 * 11, the S ₃₅ ^{* 19} with enclosed hatched area to calculate the center of gravity as shown in FIG. 8, to deduce the abscissa 28.17 degrees and spark advance.

The ignition advance inference circuit 17 calculates the inference value of the ignition advance.
28.17 degrees is output to a subsequent ignition control device (not shown) to provide engine ignition control.

(Operation of Fourth Embodiment)

The operation of the fourth embodiment of the ignition advancing inference apparatus according to the present invention will be described in detail with reference to FIGS. 1, 2, 4, 7 and 9.

Determination of Fuzzy Rule Correction Amount

The fuzzy rule correction amount is determined in the fuzzy rule correction amount determination circuit 16 in the same manner as in the first embodiment.

Inference of spark advance

The ignition advance angle is obtained by fuzzy inference in the ignition advance inference circuit 17 as follows.

That is, the ignition advance inference circuit 17 first
According to the current correction amount of the fuzzy rule provided from the fuzzy rule correction amount determination circuit 16, a fuzzy set relating to the engine speed (here, fuzzy set A in FIG. 2 (a)) and a fuzzy set relating to the intake manifold pressure (here, The fuzzy set B of FIG. 2 (b), the fuzzy set of the exhaust gas oxygen concentration (here, the fuzzy set C of FIG. 2 (c)) and the fuzzy set of the ignition advance (here, the fuzzy set E of FIG. 7). fuzzy rule (here, the fuzzy rules g ₁ to g ₁₉ shown in Table 8) that holds between the spark advance in a consequent part of, corrects as in Table 11. here,
Contribution with respect to engine speed and intake manifold pressure
The fuzzy rule with the largest membership function (ie, grade) is subject to correction. Fuzzy rule to be corrected, as is evident from Table 1 and FIG. 2 (hence Figure 4) is a fuzzy rule g ₆ in Table 8.

[0093]

[Table 11]

The ignition advancing inference circuit 17 is thereafter provided with a fuzzy set relating to the engine speed (here, a fuzzy set A in FIG. 2 (a)) and a fuzzy set relating to the intake manifold pressure (here, a fuzzy set A in FIG. 2 (b)). Set B), a fuzzy set related to exhaust gas oxygen concentration (here, fuzzy set C in FIG. 2C) and a fuzzy set related to ignition advance (here, fuzzy set E in FIG. 7), and corrected as described above. based on been fuzzy rule (fuzzy rule g ₁ to g ₁₉ shown in Table 11 in this case), given from the intake and the detection result of the engine rotational speed given from the engine speed sensor 11 manifold pressure detecting sensor 12 According to the detection result of the intake manifold pressure and the detection result of the exhaust gas oxygen concentration given from the exhaust gas oxygen concentration detection sensor 13,
An inference value of the ignition advance angle is obtained by fuzzy inference. Less than,
The fuzzy inference in the ignition advance inference circuit 17 is shown in FIG.
~ (C) and the fuzzy set A~C shown in FIG. 7 will be exemplified as being performed on the basis of the fuzzy rule g ₁ to g ₁₉ shown in Table 11 established between the E. Therefore, in the present invention, (i) fuzzy sets A to
The number of membership functions included in each of C and E may be increased or decreased, or the shape thereof may be changed. (Ii) The number of fuzzy rules g _{1 to} g ₁₉ may be increased or decreased, or the content thereof may be changed. You may.

[0095]

[Table 12]

Based on Table 1, FIG. 2 and FIG. 7, the ignition lead angle inferring circuit 17 calculates the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration in the fuzzy rules g _{1 to} g ₁₉ in Table 11. Is determined as shown in FIG. 4 and Table 12.

The ignition advancing inference circuit 17 then determines the contribution (ie, grade) of each of the membership functions of the engine speed, the intake manifold pressure, and the exhaust gas oxygen concentration for each of the fuzzy rules g _{1 to} g _19. Then, the smallest one of them is defined as the contribution (that is, grade) of the membership function of the spark advance as shown in Table 12.

The ignition advance inference circuit 17 further converts each membership function of the ignition advance with respect to the fuzzy rules g _{1 to} g ₁₉ into a trapezoidal membership function cut at the grade position specified in Table 12. (See Fig. 9)
.

The ignition advancing inference circuit 17 calculates the trapezoidal membership functions S ₂₆ ^{* 5} , S ₂₆ ^{* 6} , S ₂₀ ^{* 7} , S
^{_{29 * 9, S 26 * 10}} , S 23 * 11, the S ₃₅ ^{* 19} with enclosed hatched area to calculate the center of gravity as shown in FIG. 9, to infer the abscissa 26.18 degrees and spark advance.

The ignition advancing inference circuit 17 finally outputs the inferred value of the ignition advancing angle of 26.18 degrees to a subsequent ignition control device (not shown), and uses it for ignition control of the engine.

(Modification) In the above description, the fuzzy rules f _{1 to} f ₁₉ ; g _{1 to} g ₁₉
Or all the contributing ones are corrected or only the one with the largest contribution is corrected. However, the present invention is not limited to this, and the fuzzy rules f _{1 to} f ₁₉ ; g
Are inclusion may be corrected by a plurality select large contribution of ₁ to g _19.

[0102]

As apparent from the above description, the ignition advancing inference device according to the present invention obtains the ignition advancing angle and gives it to the ignition control device as specified in the column of [Means for Solving the Problems].
An ignition advancing inference device for controlling an ignition device disposed in a cylinder of an engine, particularly, (a) obtaining a change in a cylinder pressure during combustion detected by a cylinder pressure detection sensor, ) When the pressure in the cylinder increases,
When the previous correction amount of the fuzzy rule is positive, the ignition advance of the fuzzy rule is increased, and when the previous correction amount of the fuzzy rule is negative, the ignition advance of the fuzzy rule is decreased, and (i
i) When the pressure in the cylinder decreases, the ignition advance angle of the fuzzy rule is decreased when the previous correction amount of the fuzzy rule is positive, and the ignition advance angle of the fuzzy rule is increased when the previous correction amount of the fuzzy rule is negative. A fuzzy rule correction amount determining circuit for determining and outputting the current correction amount of the fuzzy rule, and (b) a fuzzy set for the engine speed, a fuzzy set for the intake manifold pressure, and a fuzzy set for the exhaust gas oxygen concentration and ignition. The engine speed detected by the engine speed detection sensor based on the fuzzy rule which is established between the fuzzy set relating to the advance angle and which is corrected according to the current correction amount of the fuzzy rule output from the fuzzy rule correction amount determination circuit. Number and intake manifold pressure and exhaust gas acid detected by intake manifold pressure detection sensor An ignition advancing inference circuit for obtaining an ignition advancing angle by fuzzy inference according to the exhaust gas oxygen concentration detected by the concentration detection sensor is provided. (I) Fuzzy inference for fuzzy inference of the ignition advancing angle It has the effect of automatically updating the rules based on changes in cylinder pressure during combustion and the previous correction amount of the fuzzy rules, and (ii) the effect of simplifying the fuzzy rules for fuzzy inference of ignition advance and (iii) It has the effect of shortening the time required to construct fuzzy rules for fuzzy inference of ignition advance, and (iv) the effect of simplifying the execution circuit of fuzzy inference and speeding up fuzzy inference. (v) It has the effect of improving the fuzzy rules for fuzzy inference with the operation of the engine, and consequently (vi) miniaturization or cost reduction can be achieved, and ignition It has the effect of control of immediacy that can improve the effectiveness and (vii) the combustion efficiency can be ensured.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram for commonly showing first to fourth embodiments of an ignition advance inference device according to the present invention.

FIG. 2 is a graph for explaining the operation of the first to fourth embodiments shown in FIG. 1;

FIG. 3 is a graph for explaining the operation of the first and second embodiments shown in FIG. 1;

FIG. 4 is a graph for explaining the operation of the first to fourth embodiments shown in FIG. 1;

FIG. 5 is a graph for explaining the operation of the first embodiment shown in FIG. 1;

FIG. 6 is a graph for explaining the operation of the second embodiment shown in FIG. 1;

FIG. 7 is a graph for explaining the operation of the third and fourth embodiments shown in FIG. 1;

FIG. 8 is a graph for explaining the operation of the third embodiment shown in FIG. 1;

FIG. 9 is a graph for explaining the operation of the fourth embodiment shown in FIG. 1;

FIG. 10 is a block circuit diagram showing a conventional ignition advance inference device.

[Explanation of symbols] 10 ····································································・ ・ Engine speed sensor 12 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Intake manifold pressure sensor 13 ・ ・ ・ ・ ・ ・ ・... Exhaust gas oxygen concentration detection sensor 14 ... Cylinder pressure detection sensor 15・ ・ ・ ・ ・ ・ ・ ・ Storage device 16 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Fuzzy rule correction amount determination circuit 17 ........... Ignition advance inference circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 5/15 F02D 45/00 368 F02D 45/00 370 F02P 5/152 F02P 5/153

Claims (1)

(57) [Claims] An ignition advancing inference device for determining an ignition advancing angle and applying it to an ignition control device for use in controlling an ignition device provided in a cylinder of an engine, comprising: (a) a cylinder pressure detection sensor (14) Calculate the detected change in cylinder pressure during combustion. (I) If the cylinder pressure increases, increase the ignition advance angle of the fuzzy rule when the previous correction amount of the fuzzy rule is positive, and When the correction amount is negative, the ignition advance of the fuzzy rule is decreased, and (ii) when the pressure in the cylinder decreases, the ignition advance of the fuzzy rule is reduced when the previous correction amount of the fuzzy rule is positive, and the fuzzy rule is reduced. A fuzzy rule correction amount determining circuit (16) for determining and outputting the current correction amount of the fuzzy rule for increasing the ignition advance angle of the fuzzy rule when the previous correction amount of the rule is negative; The fuzzy set concerning the number, the fuzzy set concerning the intake manifold pressure, the fuzzy set concerning the exhaust gas oxygen concentration, and the fuzzy set concerning the ignition advance angle, and the fuzzy rule output from the fuzzy rule correction amount determination circuit (16) Based on the fuzzy rule corrected according to the correction amount this time, the engine speed detected by the engine speed detection sensor (11), the intake manifold pressure detected by the intake manifold pressure detection sensor (12), and the exhaust gas oxygen concentration detection Sensor (13)
An ignition advance inference circuit for determining an ignition advance by fuzzy inference according to the exhaust gas oxygen concentration detected by the ignition advance inference device.