JP2912000B2 - Ignition control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Industrial Application Field] The present invention relates to an ignition control device which generates an ignition control signal and gives it to an ignition device arranged in a cylinder of an engine. The advance angle is obtained by fuzzy inference from the exhaust gas oxygen concentration and the knocking information based on the engine speed and the air supply amount to the combustion chamber of the engine, and the ignition time determined from the crank angle is corrected based on the advance angle to obtain a corrected ignition time. The present invention relates to an ignition control device which generates an ignition control signal at the corrected ignition time and gives it to the ignition device.

2. Description of the Related Art Conventionally, as an ignition control device of this type, as in an ignition control device 10 shown in FIG. 7, (i) a fuzzy set relating to an engine speed and air supplied to a combustion chamber of the engine. Set between the fuzzy set concerning the supply amount of fuel, the fuzzy set concerning the oxygen concentration in the air supplied to the combustion chamber of the engine, the fuzzy set concerning the oxygen concentration in the exhaust gas, and the fuzzy set concerning the oxygen concentration in the combustion chamber of the engine Based on the first fuzzy rule, the engine speed detected by the engine speed detection sensor 23, the supply amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor 24, and the oxygen concentration The oxygen concentration in the air being supplied to the combustion chamber of the engine detected by the detection sensor 25 and the exhaust gas oxygen concentration detection sensor 26 The oxygen concentration in the combustion chamber of the engine is obtained by fuzzy inference by the oxygen concentration inference device 36 in accordance with the oxygen concentration in the exhaust gas detected in the above-mentioned manner. Fuzzy set relating to the amount of fuel supplied to the combustion chamber of the second and the fuzzy set relating to the λ value
According to the fuzzy rule of the above, according to the oxygen concentration in the combustion chamber of the engine determined by the oxygen concentration inference device 36 and the supply amount of fuel supplied to the combustion chamber of the engine detected by the fuel supply amount detection sensor 22 , Λ value inference device 37
Λ is obtained by fuzzy inference according to (iii), based on a third fuzzy rule which is established between a fuzzy set relating to the λ value, a fuzzy set relating to the engine speed, and a fuzzy set relating to the load, the λ value inference device 37 In accordance with the obtained λ value and the engine speed detected by the engine speed detection sensor 23, the load inference device 38
The load applied to the engine is obtained by fuzzy inference according to (iv). A fourth fuzzy set among a fuzzy set related to the load, a fuzzy set related to the engine speed, a fuzzy set related to the knocking information, and a fuzzy set related to the advance angle. Based on the rules, the load determined by the load inference device 38, the engine speed detected by the engine speed detection sensor 23, and the knocking detection sensor
In accordance with the knocking information detected by 27, the advance angle is obtained by fuzzy inference by the advance angle inference device 35,
(V) The corrected ignition time obtained by correcting the ignition time detected by the ignition time detection device 41 from the crank angle detected by the crank angle detection sensor 21 according to the advance angle obtained by the advance angle inference device 35. In addition, an ignition control signal is generated by an ignition control signal generator 71 and is given to an ignition device 61 attached to a cylinder determined by a cylinder determination device 51 from cylinder information detected by a cylinder detection sensor 28. It had been.

[Problems to be Solved] However, in the conventional ignition control device 10 , the oxygen concentration in the combustion chamber of the engine is determined by the oxygen concentration inference device 36, and the oxygen concentration in the combustion chamber of the engine determined by the oxygen concentration inference device 36 is calculated. The load applied to the engine is obtained by the load inference device 38 using the λ value obtained by the λ value inference device 37, and the load applied by the load inference device 38 is obtained. Using the load applied to the engine, the advance angle is obtained by the advance angle inference device 35, and the ignition control is performed at the corrected ignition time obtained by correcting the ignition time determined from the crank angle by the advance angle obtained by the advance angle inference device 35. Since a signal has been generated, there is a disadvantage that (i) fuzzy inference for obtaining an advance angle must be executed at at least four places, which is complicated, and (ii) an execution circuit for fuzzy inference is complicated. Disadvantage In addition, (iii) there is a disadvantage that a great deal of time is required for fuzzy inference, and consequently (iv) it is not possible to achieve downsizing or cost reduction, and it is not possible to secure the immediacy of ignition control. .

Therefore, in order to eliminate these disadvantages, the present invention obtains the advance angle by fuzzy inference from the engine speed, the air supply amount to the combustion chamber of the engine, the exhaust gas oxygen concentration, and the knocking information. The ignition control device is configured to determine the corrected ignition time by correcting the ignition time determined from the above, and to generate an ignition control signal at the corrected ignition time.

(2) Configuration of the Invention [Means for Solving the Problems] The means for solving the problems provided by the present invention is described in an ignition control device that generates an ignition control signal and supplies the signal to an ignition device provided in a cylinder of an engine. (A) A fuzzy set relating to the engine speed, a fuzzy set relating to the amount of air supplied to the combustion chamber of the engine, a fuzzy set relating to the oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine, and knocking information. Based on a fuzzy rule that is established between the fuzzy set related to the advance angle and the fuzzy set related to the advance angle, the crank angle detection sensor (21) is detected by the engine speed detection sensor (23) or by the engine speed calculation device (23A). The engine speed calculated from the detected crank angle and the air supply amount detected by the sensor (24) The amount of air supplied to the engine combustion chamber, the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor (26), and the knocking information detected by the knocking detection sensor (27) (B) an advance angle inference device for obtaining an advance angle by fuzzy inference; and (b) an ignition time detected by an ignition time detection device (41) from a crank angle detected by a crank angle detection sensor (21). An ignition control signal is generated at a corrected ignition time obtained by correcting according to the advance angle obtained by the advance angle inference device (35), and the cylinder information detected by the cylinder detection sensor (28) is converted into the cylinder discrimination device (51). ), And an ignition control signal generator (71) for giving to an ignition device (61) attached to the cylinder determined by the above processing. is there.

[Operation] The ignition control device according to the present invention generates an ignition control signal and supplies the ignition control signal to the ignition device provided in the cylinder of the engine, as specified in the above-mentioned [Means for Solving the Problems]. In particular, (a) a fuzzy set relating to the number of revolutions of the engine, a fuzzy set relating to the amount of air supplied to the combustion chamber of the engine, and an oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine. Based on the fuzzy set that is established between the fuzzy set and the fuzzy set related to knocking information and the fuzzy set related to advance angle, based on the crank angle detected by the engine speed detection sensor or detected by the crank angle detection sensor by the engine speed calculation device Engine combustion detected by the calculated engine speed and air supply amount detection sensor To determine the advance angle by fuzzy inference according to the amount of air supplied to the chamber, the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor, and the knocking information detected by the knocking detection sensor And (b) correcting the ignition time detected by the ignition time detection device from the crank angle detected by the crank angle detection sensor in accordance with the advance angle obtained by the advance angle inference device. An ignition control signal generating device for generating an ignition control signal at the corrected ignition time, processing the cylinder information detected by the cylinder detection sensor by the cylinder discriminating device, and providing the same to the ignition device attached to the determined cylinder. (I) works to simplify fuzzy inference, and (ii) works to simplify the execution circuit of fuzzy inference And (iii) without the effect of speeding up the fuzzy inference, to achieve results in (vi) downsizing or cost reduction, and an action to ensure the immediacy of ignition control.

Embodiment Next, a preferred embodiment of the ignition control device according to the present invention will be described in detail with reference to the accompanying drawings.

However, the embodiments described below are described for facilitating or facilitating the understanding of the present invention, but not 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.

FIG. 1 is a circuit diagram showing a first embodiment of an ignition control device according to the present invention.

2 (a) to 2 (e) are graphs for explaining the operation of the embodiment of FIG. 1, and show an example of a fuzzy set used in fuzzy inference in the lead angle inference device 35.

Figure 3 (a ₁₎ ~ (o) is a graph for explaining the operation of Figure 1 embodiment shows an example of fuzzy inference in advance inference apparatus 35.

FIG. 4 is a circuit diagram showing a second embodiment of the ignition control device according to the present invention.

FIG. 5 is a circuit diagram showing a second embodiment of the ignition control device according to the present invention.

FIG. 6 is a circuit diagram showing a third embodiment of the ignition control device according to the present invention.

(Configuration of First Embodiment) First, the configuration of a first embodiment of an ignition control device according to the present invention will be described in detail with reference to FIG.

10 is an ignition control device according to the present invention, a crank angle detection sensor 21 for detecting a crank angle,
An engine rotation speed detection sensor 23 for detecting the rotation speed of the engine per unit time, an air supply amount detection sensor 24 for detecting a supply amount of air given to the carburetor and, consequently, the engine; An exhaust gas concentration detection sensor 26 for detecting the oxygen concentration in the exhaust gas discharged from the engine, a knocking detection sensor 27 for detecting knocking (that is, abnormal combustion of fuel in the combustion chamber of the engine), and a predetermined cylinder. And a cylinder detection sensor 28 that is disposed at a position (for example, a top dead center position) and detects that the piston has reached its predetermined position (ie, cylinder information).

The ignition control device 10 according to the present invention further includes a filter 34 connected to the knocking detection sensor 27 for extracting knocking information (in this case, information relating to an impact accompanying abnormal combustion of fuel in the combustion chamber of the engine). The engine speed detection sensor 23, the air supply amount detection sensor 24, the exhaust gas oxygen concentration detection sensor 26, and the filter 34 are connected, and the engine speed detection result given by the engine speed detection sensor 23 and the air A fuzzy inference of the advance angle from the detection result of the air supply amount supplied from the supply amount detection sensor 24, the detection result of the exhaust gas oxygen concentration supplied from the exhaust gas oxygen concentration detection sensor 26, and the knocking information extracted by the filter 34 Angle inference device for finding by
35 and.

The ignition control device 10 according to the present invention is further connected to the crank angle detection sensor 21 and detects a time to be ignited (referred to as “ignition time”) from the detection result of the crank angle given from the crank angle detection sensor 21. And an ignition time detection device 41 for processing, and processing the cylinder information detected by the cylinder detection sensor 28 to determine a cylinder in a state to be ignited and output a cylinder determination signal. Cylinder discriminating device 51 and ignition time detecting device 41
And is connected to the cylinder discriminating device 51 and the advance angle inference device 35, and corrects the ignition time given from the ignition time detection device 41 in accordance with the lead angle inference result given from the advance angle inference device 35, and corrects it. A cylinder discriminator that generates an ignition control signal at the ignition time
An ignition control signal generator 71 is provided for giving an ignition device 61 attached to the cylinder determined by 51 to the cylinder.

(Operation of First Embodiment) Further, the operation of the first embodiment of the ignition control device according to the present invention will be described in detail with reference to FIG.

Lead Angle Inference The lead angle is obtained by fuzzy inference in the lead angle inference device 35 as follows.

That is, the advancing angle inference device 35 includes a fuzzy set related to the engine speed (for example, a fuzzy set A in FIG. 2A) and a fuzzy set related to the air supply to the combustion chamber of the engine (for example, the fuzzy set in FIG. 2B). Set B), a fuzzy set relating to the oxygen concentration in the exhaust gas (for example, fuzzy set C in FIG. 2 (c)), a fuzzy set relating to the knocking information (for example, fuzzy set D in FIG. 2 (d)) and a fuzzy relating to the advance angle. based on the set (e.g. Figure 2 (fuzzy set E of e)) (fuzzy rule f ₁ ~f ₁₄ shown for example in table 1) fuzzy rules established between given from the engine speed sensor 23 The result of the detected engine speed, the result of the air supply provided by the air supply detection sensor 24, and the result of the exhaust gas oxygen concentration detection Depending on the detection result of the exhaust gas oxygen concentration and the knocking detection sensor 27 and the detection result of the knocking information supplied through the filter 34 to determine the lead angle by fuzzy inference. Hereinafter, the fuzzy inference in advance inference device 35, based on the fuzzy rule f ₁ ~f ₁₄ shown in Table 1 that holds between the fuzzy set A~E shown in FIG. 2 (a) ~ (e) A description will be given by way of example. Therefore, in the present invention, if desired, (i)
The membership functions included in the fuzzy sets A to E may be increased or decreased, or their shapes may be changed. (Ii)
To increase or decrease the number of fuzzy rules f ₁ ~f _14, or may change its contents.

The fuzzy inference in the lead angle inference device 35 is based on the detection result of the engine speed given from the engine speed detection sensor 23, the detection result of the air supply amount given from the air supply detection sensor 24, and the exhaust gas oxygen concentration detection sensor 26. A general description of the detection result of the oxygen concentration in the exhaust gas given from the engine and the detection result of the knocking information given from the knocking detection sensor 27 via the filter 34 will be described. In this case, the detection result of the engine speed given from the engine speed detection sensor 23, the detection result of the air supply amount given from the air supply amount detection sensor 24, and the exhaust gas oxygen concentration detection Detection result of oxygen concentration in exhaust gas given from sensor 26 and knocking detection sensor 27
And the detection result of the knocking information given through the filter 34 from the filter is as shown in Table 2. This will be described by way of example.

Advance inference apparatus 35 relates to the fuzzy rules f _1, first (i) Based on Table 1, the membership function Z _A and a second view that is included in the fuzzy set A shown in FIG. 2 (a) ( elect a membership function S _B contained in the fuzzy set B shown in b), then (ii) engine speed
Function value of membership function Z _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function S _B corresponding to the air supply 2000 l / min ▲ ▼ and the third view (a ₁₎ determining as shown in (a _2). Since the engine speed 2000 times / function value of a corresponding membership function Z _A to a separatory ▲ ▼ is the function value of the membership function S _B corresponding to the supply amount 2000 l / min air ▲ ▼ smaller than, the advance inference apparatus 35 Is the second
The membership function S _E belonging to the fuzzy set E shown in FIG. 7E is cut at the position of the height ▲ ▼ to form a trapezoidal membership function S _E ^{* 1 as} shown in FIG. 3 (a ₃ ).
Create

Advance inference apparatus 35 relates to the fuzzy rules f _2, first (i)
Based on Table 1, the fuzzy set A shown in FIG.
Membership is included in the function S elect the _A and membership functions Z _B contained in the fuzzy set B shown in FIG. 2 (b), then (ii) engine speed 2000 times /
Function value of membership function S _A corresponding to minute ▲ ▼
To correspond to the air supply 2000 l / min membership function Z _B
Are obtained as shown in FIGS. 3 (b ₁ ) and (b ₂ ). The function value ▲ ▼ of the membership function S _A corresponding to the engine speed 2000 times / minute is the air supply amount 2000
Function value of membership function Z _B corresponding to l / min ▲
2 (e).
The membership function M _E belonging to the fuzzy set E shown in
Is cut at the height ▲ ▼ to create a trapezoidal membership function M _E ^{* 2} as shown in FIG. 3 (b ₃ ).

Advance inference apparatus 35 relates to the fuzzy rules f _3, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( elect a membership function S _B contained in the fuzzy set B shown in b), then (ii) engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function S _B corresponding to the air supply 2000 l / min ▲ ▼ and the third view (c ₁₎ determining as shown in (c _2). Since the engine speed 2000 times / function value of a corresponding membership function S _A to a separatory ▲ ▼ is the function value of the membership function S _B corresponding to the supply amount 2000 l / min air ▲ ▼ smaller than, the advance inference apparatus 35 Is the second
The membership function S _E belonging to the fuzzy set E shown in FIG. (E) is cut at the position of the height ▲ ▼ to form a trapezoidal membership function S _E ^{* 3 as} shown in FIG. 3 (c ₃ ).
Create

Advance inference apparatus 35 relates to the fuzzy rules f _4, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( elect a membership function M _B contained in the fuzzy set B shown in b), then (ii) engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function M _B which corresponds to the air supply amount 2000 l / min ▲ ▼ and the third view (d ₁₎ determining as shown in (d _2). Since the function value of the membership function S _A corresponding to the engine rotational speed 2000 rev / min ▲ ▼ is the function value of the membership function M _B corresponding to 2000 l / min ▲ ▼ greater than the air supply quantity, the advance inference apparatus 35 is a membership function Z _E belonging to the fuzzy set E shown in FIG. 2 (e) and a trapezoidal membership function as shown in FIG. 3 (d ₃ ) cut at the position of height ▲ ▼. Z _E ^{* 4}
Create

Advance inference apparatus 35 relates to the fuzzy rules f _5, first (i) Based on Table 1, the membership functions M _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( elect a membership function S _B contained in the fuzzy set B shown in b), then (ii) engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function S _B corresponding to the air supply 2000 l / min ▲ ▼ and the third view (e ₁₎ determining as shown in (e _2). Since the function value ▲ ▼ of the membership function M _A corresponding to the engine speed of 2000 / min is smaller than the function value ▲ ▼ of the membership function S _B corresponding to the air supply amount of 2000 l / min, the lead angle inference device 35 Is the second
Figure members of the membership function M _E height belonging to fuzzy set E shown in (e) ▲ ▼ Figure 4 is cut at the position of (e ₃₎ ladder shape as shown in (here height O) Create the ship function _ME ^{* 5} .

Advance inference apparatus 35 relates to the fuzzy rules f _6, first (i) Based on Table 1, the membership functions M _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( elect a membership function M _B contained in the fuzzy set B shown in b), then (ii) engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function M _B which corresponds to the air supply amount 2000 l / min ▲ ▼ and the third view (f ₁₎ determining as shown in (f _2). Membership function M _B function value function value of the membership function M _A corresponding to the engine rotational speed 2000 rev / min ▲ ▼ correspond to the supply amount 2000 l / min air ▲
Since it is smaller than ▼, the lead angle inference device 35 cuts the membership function S _E belonging to the fuzzy set E shown in FIG. 2 (e) at the position of the height ▲ ▼ and FIG. 3 (f ₃ ).
A membership function S _E ^{* 6} having a ladder shape (here, height O) is created as shown in FIG.

Advance inference apparatus 35 relates to the fuzzy rules f _7, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function S _C included in the fuzzy set C shown in c) is selected, and then (ii) the engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
▼ a membership function S _C function value corresponding to the exhaust gas oxygen concentration 13% ▲ ▼ and the third diagram (g ₁₎ (g ₂₎
Calculate as shown in Since the engine speed 2000 times / function value of a corresponding membership function S _A to a separatory ▲ ▼ is smaller than the function value ▲ ▼ membership functions S _C corresponding to the exhaust gas oxygen concentration of 13%, the advance inference apparatus 35 Is
The membership function M _E belonging to the fuzzy set E shown in FIG. 2 (e) is cut at the position of the height ▲ ▼ to form a trapezoidal membership function M _E ^{* as} shown in FIG. 3 (g ₃ ). ⁷
Create

Advance inference apparatus 35 relates to the fuzzy rules f _8, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function L _C included in the fuzzy set C shown in c) is selected, and then (ii) the engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
▼ a function value ▲ ▼ and a third view of the membership function L _C corresponding to the exhaust gas oxygen concentration _{13% (h 1) (h} 2)
Calculate as shown in Since the function value of the membership function S _A corresponding to the engine rotational speed 2000 rev / min ▲ ▼ is the function value of the membership function L _C corresponding to the exhaust gas oxygen JOURNAL concentration 13% ▲ ▼ greater than, the advance inference apparatus 35
Is obtained by cutting the membership function Z _E belonging to the fuzzy set E shown in FIG. 2 (e) at the position of the height ▲ ▼ and forming a ladder shape (here, the height is shown in FIG. 3 (h ₃ )). O) Create a membership function Z _E ^{* 8} .

The advancing inference device 35 determines the membership function M _A included in the fuzzy set A shown in FIG. 2A based on (i) Table 1 with respect to the fuzzy rule f ₉ and the membership function M _A shown in FIG. The membership function S _C included in the fuzzy set C shown in c) is selected, and then (ii) the engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ a membership function S _C function value corresponding to the exhaust gas oxygen concentration 13% ▲ ▼ and the Figure 3 (i ₁₎ (i ₂₎
Calculate as shown in Since the engine speed 2000 times / function value of a corresponding membership function M _A to the minute ▲ ▼ is smaller than the function value ▲ ▼ membership functions S _C corresponding to the exhaust gas oxygen concentration of 13%, the advance inference apparatus 35 Is
The membership function L _E belonging to the fuzzy set E shown in FIG. 2 (e) is cut at the position of the height ▲ ▼ to form a ladder shape (here, height O) as shown in FIG. 3 (i ₃ ). to create a membership function L _E ^{* 9.}

Advance inference apparatus 35 relates to the fuzzy rules f _10, first (i) Based on Table 1, the membership functions M _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function L _C included in the fuzzy set C shown in c) is selected, and then (ii) the engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ and since it is a function value ▲ ▼ the same size of the membership function L _C corresponding to the exhaust gas oxygen concentration of 13%, the advance inference apparatus 35 belongs to the fuzzy set E shown in FIG. 2 (e) Membership function S _E height ▲
By cutting at the position ▼, a membership function S _E ^{* 10} having a trapezoidal shape (here, height 0) is created as shown in FIG. 3 (j ₃ ).

Advance inference apparatus 35 relates to the fuzzy rules f _11, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function S _D included in the fuzzy set D shown in d) is selected, and then (ii) the engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
FIG. 4 (k ₁ ) (k ₂ ) shows the relationship between ▼ and the function value ▲ ▼ of the membership function _SD corresponding to the knocking information 2V.
Calculate as shown in Since the function value ▲ ▼ of the membership function S _A corresponding to the engine speed 2000 times / minute is smaller than the function value ▲ ▼ of the membership function _SD corresponding to the knocking information 2V%, the advance angle inference device 35
Is obtained by cutting the membership function Z _E belonging to the fuzzy set E shown in FIG. 2 (e) at the position of the height ▲ ▼ and forming a trapezoidal membership function Z as shown in FIG. 4 (k ₃ ). Create _E ^{* 11} .

Advance inference apparatus 35 relates to the fuzzy rules f _12, first (i) Based on Table 1, the membership function S _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function M _D included in the fuzzy set D shown in d) is selected, and then (ii) the engine speed
Function value of membership function S _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function M _D corresponding to knocking information 2V ▲ ▼ and the Figure 4 (l ₁₎ (l ₂₎
Calculate as shown in Since the function value of the membership function S _A corresponding to the engine rotational speed 2000 rev / min ▲ ▼ is the function value of the membership function M _D corresponding to knocking information 2V ▲ ▼ greater than, the advance inference device 35,
The cut membership function Z _E belonging to the fuzzy set E shown in FIG. 2 (e) in the height ▲ ▼ position 4
As shown in Fig. (L ₃ ), the trapezoidal membership function Z _E
Create ^{* 12} .

Advance inference apparatus 35 relates to the fuzzy rules f _13, first (i) Based on Table 1, the membership functions M _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function S _D included in the fuzzy set D shown in d) is selected, and then (ii) the engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ and the function value ▲ ▼ of the membership function _SD corresponding to the knocking information 2V are shown in FIG. 4 (m ₁ ) (m ₂ )
Calculate as shown in Since the function value ▲ ▼ of the membership function M _A corresponding to the engine speed 2000 times / minute is smaller than the function value ▲ ▼ of the membership function S _D corresponding to the knocking information 2V, the advance angle inference device 35
The membership function S _E belonging to the fuzzy set E shown in FIG.
Figure (m ₃₎ as shown in ladder shape creating membership functions S _E ^{* 13} of (height O in this case).

Advance inference apparatus 35 relates to the fuzzy rules f _14, first (i) Based on Table 1, the membership functions M _A and the second view is included in the fuzzy set A shown in FIG. 2 (a) ( The membership function M _D included in the fuzzy set D shown in d) is selected, and then (ii) the engine speed
Function value of membership function M _A corresponding to 2000 times / minute ▲
▼ a function value of the membership function M _D corresponding to knocking information 2V ▲ ▼ and the Figure 4 (n ₁₎ (n ₂₎
Calculate as shown in Since the function value ▲ ▼ of the membership function M _A corresponding to the engine speed 2000 times / minute is smaller than the function value ▲ ▼ of the membership function M _D corresponding to the knocking information 2V, the advance angle inference device 35
The membership function S _E belonging to the fuzzy set E shown in FIG.
Figure (n ₃₎ as shown in ladder shape creating membership functions S _E ^{* 14} (here, the height O is).

Advance inference device 35, the membership function S _E created by the above ^{_{* 1, M E * 2,}} S E * 3, Z E * 4, M E * 5, S E * 6, M E * 7, Z _E ^{* 8} ,
^{_{L E * 9, S E *}} 10, Z E * 11, Z E * 12, S E * 13, S E * 14 for enclosed hatched area was as to calculate the centroid shown in FIG. 3 (o) Infer the advancing angle, its abscissa 24.1 degrees.

Generation of Cylinder Discrimination Signal The cylinder discrimination device 51 processes the detection result (that is, cylinder information) given from the cylinder detection sensor 28,
A cylinder in a state to be ignited is determined and output as a cylinder determination signal.

The cylinder discrimination signal is, for example, a signal that becomes a high level state when the cylinder is in a state to be ignited, and is generated for each cylinder.

Generation of ignition control signal The ignition control signal is generated by the ignition control signal generator 71.
It is generated as follows and given to the ignition device 61.

That is, the ignition control signal generation device 71 determines the ignition time detected by the ignition time detection device 41 from the crank angle detected by the crank angle detection sensor 21 in accordance with the lead angle inference result given from the lead angle inference device 35. Correct (in the above case, "advance ignition time by time equivalent to advance angle of 24.1 degrees")
An ignition control signal is generated at the corrected ignition time (i.e., the corrected ignition time), and the cylinder information detected by the cylinder detection sensor 28 is processed by the cylinder discriminating device 51 so as to be attached to the cylinder determined. This is given to the ignition device 61.

Second Embodiment In addition, the configuration and operation of an ignition control device according to a second embodiment of the present invention will be described in detail with reference to FIG.

In the second embodiment, the engine speed detection sensor 23 is replaced with an engine speed calculation device 23A, and the input end of the engine speed calculation device 23A is connected to the output end of the crank angle detection sensor 21. The configuration is substantially the same as that of the first embodiment, except that the engine speed is calculated from the detection result of the crank angle provided from the crank angle detection sensor 21.

In other words, the second embodiment has substantially the same operation and effect as the first embodiment, except that the number of sensors provided for the engine can be reduced.

Therefore, for simplicity of description, elements corresponding to those included in the first embodiment are denoted by the same reference numerals as in the first embodiment, and other detailed descriptions are given here. Is omitted.

Third Embodiment In addition, the configuration and operation of an ignition control device according to a third embodiment of the present invention will be described in detail with reference to FIG.

In the third embodiment, the cylinder detection sensor 28 is removed, and the input end of the cylinder discriminating device 51 is connected to the output end of the crank angle detection sensor 21. The configuration is substantially the same as that of the first embodiment except that the operating state of the cylinder is determined from the detection result of the angle.

In other words, the third embodiment has substantially the same operation and effect as the first embodiment, except that the number of sensors provided for the engine can be reduced.

Therefore, for simplicity of description, elements corresponding to those included in the first embodiment are denoted by the same reference numerals as in the first embodiment, and other detailed descriptions are given here. Is omitted.

Fourth Embodiment In addition, a configuration and an operation of an ignition control device according to a fourth embodiment of the present invention will be described in detail with reference to FIG.

In the fourth embodiment, the cylinder detection sensor 28 is removed, and the input end of the cylinder discriminating device 51 is connected to the output end of the crank angle detection sensor 21. The configuration is substantially the same as that of the second embodiment except that the operating state of the cylinder is determined from the detection result of the angle.

In other words, the fourth embodiment has substantially the same operation and effect as the second embodiment, except that the number of sensors provided for the engine can be reduced.

Therefore, for simplicity of description, elements corresponding to those included in the second embodiment are given the same reference numerals as in the second embodiment, and other detailed descriptions are given here. Is omitted.

Modified Example In the above description, the fuzzy inference is performed by cutting off the top of the membership function to obtain the center of gravity. However, the present invention is not limited to this. It also covers the case where fuzzy inference is performed (for example, by changing the height of the membership function to find the center of gravity). In other words, the present invention does not limit fuzzy inference to a certain one.

(3) Effects of the Invention As is apparent from the above description, the ignition control device according to the present invention is an ignition control device that generates an ignition control signal and gives the signal to an ignition device arranged in a cylinder of an engine.
(A) A fuzzy set relating to the engine speed, a fuzzy set relating to the amount of air supplied to the combustion chamber of the engine, a fuzzy set relating to the oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine, and knocking information. An engine speed detected by an engine speed detection sensor or calculated from a crank angle detected by a crank angle detection sensor by an engine speed calculation device based on a fuzzy rule established between a fuzzy set and a fuzzy set related to advance angle. And the amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor, the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor, and the knocking detected by the knocking detection sensor Depending on the information, fuzzy inference An advance angle inference device for obtaining an advance angle, and (b) an ignition time detected by the ignition time detection device from the crank angle detected by the crank angle detection sensor in accordance with the advance angle obtained by the advance angle inference device. An ignition control signal is generated at the corrected ignition time obtained by the correction,
An ignition control signal generator for processing the cylinder information detected by the cylinder detection sensor by the cylinder discriminating device and applying the processed information to an ignition device attached to the cylinder determined. (I) Fuzzy inference It has the effect of simplifying the circuit, and (ii) the effect of simplifying the execution circuit of fuzzy inference, and (iii) the effect of speeding up the fuzzy inference. As a result, (iv) reducing the size or cost. This has the effect of achieving the instantaneousness of the ignition control device.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of an ignition control device according to the present invention, FIGS. 2 (a) to 2 (e) are graphs for explaining the embodiment of FIG. 1, and FIG. (a ₁₎ ~ (o) is a graph for explaining the first FIG embodiment, Figure 4 is a circuit diagram for showing a second embodiment of an ignition control device according to the present invention, Fig. 5 present FIG. 6 is a circuit diagram showing a third embodiment of the ignition control device according to the present invention, FIG. 6 is a circuit diagram showing a fourth embodiment of the ignition control device according to the present invention, and FIG. It is a circuit diagram for showing. 10 Ignition control device 21 Crank angle detection sensor 23 Engine speed detection sensor 23A Engine speed calculation device 24 Air supply amount detection sensor 26 Exhaust gas oxygen concentration detection sensor 27 Knocking Detection sensor 28 Cylinder detection sensor 34 Filter 35 Lead angle inference device 41 Ignition time detection device 51 Cylinder determination device 61 Ignition device 71 Ignition control signal generation device

Claims (1)

(57) [Claims] An ignition control device for generating an ignition control signal and applying it to an ignition device disposed in a cylinder of an engine, comprising: (a) a fuzzy set relating to an engine speed and air supplied to a combustion chamber of the engine; The engine rotation is based on the fuzzy set of the fuzzy set for the supply amount of fuel, the fuzzy set for the oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine, the fuzzy set for the knocking information, and the fuzzy set for the advance angle. The crank angle detection sensor (2) is detected by the number detection sensor (23) or by the engine speed calculation device (23A).
The engine rotation speed calculated from the crank angle detected in 1) and the supply amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor (24) and the exhaust gas oxygen concentration detection sensor (26) An advance inference device (35) for obtaining an advance angle by fuzzy inference according to the oxygen concentration in the exhaust gas detected by the engine and the knocking information detected by the knocking detection sensor (27); Correction ignition obtained by correcting the ignition time detected by the ignition time detection device (41) from the crank angle detected by the angle detection sensor (21) according to the advance angle obtained by the advance angle inference device (35). At a time, an ignition control signal is generated, and cylinder information detected by the cylinder detection sensor (28) is processed by a cylinder discriminating device (51). (61) the ignition control signal generator (71) and an ignition control device, characterized in that it comprises an for providing relative.