JP2938202B2 - Ignition control 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 control device,
In particular, the ignition advance angle is corrected by fuzzy inference to obtain the ignition advance angle correction amount based on the temporal change amount of the cylinder pressure in the engine and the previous estimated value of the ignition advance angle correction amount so as to maximize the cylinder pressure. The present invention relates to an ignition control device.

[0003]

2. Description of the Related Art Conventionally, as an ignition control device, an ignition advance is determined according to an engine speed, an engine coolant temperature, an intake manifold pressure (ie, boost pressure), and the like, and an ignition advance control signal is supplied to the ignition device. What was given was proposed.

[0004]

[Problems to be Solved] However, in the conventional ignition control device, at least the pressure in the cylinder is not adopted as a deciding factor of the ignition advance angle. Therefore, there is a drawback that (i) the pressure in the cylinder is not maximized. (ii) There is a disadvantage that the combustion efficiency is not sufficiently improved.

In order to eliminate these drawbacks, the present invention provides a fuzzy inference of the ignition advance correction amount according to the temporal change in the cylinder internal pressure of the engine and the previous estimate of the ignition advance correction amount. And an ignition control device which determines the ignition advance angle so as to maximize the cylinder pressure.

[0006]

Configuration of the Invention

[0007]

Means for Solving the Problems The means for solving the problems provided by the present invention is as follows. An ignition control device for generating an ignition control signal and applying the signal to an ignition device provided in an engine cylinder includes: A first pressure sensor (21) provided for the intake manifold for detecting and outputting a boost pressure; and (b) provided for an engine output shaft. A rotation speed detection sensor (23) for detecting the rotation speed of the shaft and outputting it as an engine rotation speed,
(c) An input terminal is connected to at least one of the output terminal of the first pressure sensor (21) and the output terminal of the rotation speed detection sensor (23), and the input terminal is connected to the first pressure sensor (21). An ignition advance basic amount determining circuit () for determining and outputting an ignition advance basic amount based on at least one of the given boost pressure and the engine speed given from the rotation speed detection sensor (23). 25), (d) a second pressure sensor (31) arranged in the cylinder of the engine for detecting and outputting the pressure in the cylinder of the engine, and (e) a second pressure sensor (3).
A change amount calculation circuit (33), which is connected to (1) and calculates a time change amount of the cylinder pressure detected by the second pressure sensor (31); and (f) a change amount calculation circuit. The input end is connected to the output end of (33), and the fuzzy set for the time variation of the cylinder pressure, the fuzzy set for the previous estimated value of the ignition advance correction amount, and the fuzzy set for the ignition advance correction amount Based on the fuzzy rule that is established between the above, the previous inference of the temporal change amount of the cylinder pressure applied to the input terminal from the change amount calculation circuit (33) and the ignition advance correction amount applied to the other input terminals The ignition advance correction amount inference circuit (34) for obtaining the ignition advance correction amount by fuzzy inference according to the value, and (g) the output terminal of the ignition advance correction amount inference circuit (34) and other inputs The ignition advance output from the ignition advance correction amount inference circuit (34). Holding circuit for holding the correction amount is output as a previous inferred value of the ignition advance correction amount
(35) and (h) input terminals are connected to the output terminal of the ignition advance basic amount determination circuit (25) and the output terminal of the ignition advance correction amount inference circuit (34), and the ignition advance An ignition advance angle for determining an ignition advance angle based on the ignition advance basic amount given from the basic amount determination device (25) and the ignition advance correction amount given from the ignition advance correction amount inference circuit (34). And a determination device (15).

[0008]

The ignition control device according to the present invention generates an ignition control signal and supplies it to the ignition device provided in the cylinder of the engine, as specified in the above section "Means for Solving the Problems". In particular, (a) a first pressure sensor that is provided for an intake manifold of the engine and detects and outputs boost pressure, and (b) is provided for an output shaft of the engine. A rotation speed detection sensor for detecting the rotation speed of the output shaft of the engine and outputting the detected rotation speed as an engine rotation speed; and (c) an output terminal of the first pressure sensor and an output terminal of the rotation speed detection sensor. The input terminal is connected to at least one of the first and second ignition timings. Based on at least one of the boost pressure given from the first pressure sensor and the engine speed given from the rotation speed detection sensor, the ignition advance basic Determine the amount (D) a second pressure sensor disposed in the cylinder of the engine for detecting and outputting the pressure in the cylinder of the engine, and (e) A change amount calculation circuit connected to the second pressure sensor for calculating a temporal change amount of the in-cylinder pressure detected by the second pressure sensor; and (f) an output of the change amount calculation circuit. The input end is connected to the end, and it is established between a fuzzy set related to the time variation of the cylinder pressure, a fuzzy set related to the previous estimated value of the ignition advance correction amount, and a fuzzy set related to the ignition advance correction amount. Fuzzy inference based on the fuzzy rules and the temporal change of the cylinder pressure given to the input from the change calculation circuit and the previous estimated value of the ignition advance correction given to the other input. Ignition advance correction An ignition advance correction amount inference circuit for determining the amount of the ignition advance correction amount inference circuit, which is disposed between the output end of the ignition advance correction amount inference circuit and the other input end. A holding circuit for holding the output ignition advance correction amount and outputting it as a previous inference value of the ignition advance correction amount; (h) an output terminal of an ignition advance basic amount determination circuit and an ignition advance correction amount inference circuit; The input end is connected to the output end of the ignition advance basic amount and the ignition advance correction amount provided from the ignition advance correction amount inference circuit. An ignition advancing angle determination device for determining an ignition advancing angle on the basis of the ignition advancing angle when the in-cylinder pressure of the engine increases and decreasing the advancing angle when the in-cylinder pressure of the engine decreases. (I) The cylinder pressure is No act to Daehwa, thus (ii)
It works to improve combustion efficiency.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of an 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:
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 sixth embodiments of the ignition control device according to the present invention.

FIG. 2 is a block circuit diagram showing a first and a fourth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. Shows the ignition advance angle generating device 10A .

FIG. 3 is a graph for explaining the operation of the first and fourth embodiments shown in FIG. 2. In particular, FIG. 5 shows an example of a conversion graph for determining the ignition advance basic amount Q ₀ .

[0016] FIG. 4 (a) ~ (c) is a graph for explaining the operation of the first embodiment shown in FIG. 2, in particular, the spark advance of the ignition advance correction inference apparatus in 30 3 shows an example of a fuzzy set used in fuzzy inference in the correction amount inference circuit 34.

FIGS. 5A to 5K show the first embodiment shown in FIG.
7 is a graph for explaining the operation of the embodiment, and particularly shows an example of fuzzy inference in the ignition advance correction amount inference circuit 34 in the ignition advance correction inference device 30 .

FIG. 6 is a block circuit diagram showing a second and a fifth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. Shows the ignition advance angle generating device 10A .

FIG. 7 is a block circuit diagram showing a third and a sixth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. Shows the ignition advance angle generating device 10A .

(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 FIGS. Here, for simplicity of description, it is assumed that the engine is provided with six cylinders, but there is no intention to limit the present invention to this.

Reference numeral 10 denotes an ignition control device according to the present invention, which is disposed on a crankshaft of an engine (not shown) and has a crank angle (ie, a rotation angle position of the crankshaft).
A crank angle detection sensor 11 for outputting the detected detection result as a crank angle detection signal S ₁₁ a, given from the crank angle sensor 11 is input is connected to the output terminal of the crank angle detection sensor 11 detects the ignition time from the crank angle detection signal S ₁₁ the ignition time signal S ₁₂
And an ignition time detector 12 for outputting the same as a predetermined time (for example, a position corresponding to the top dead center position) of a cylinder (for example, a specific one) of the engine. a cylinder sensor 13 for outputting the detected detection result that has been reached as a cylinder detection signal S _21, the cylinder detection signal S ₂₁ supplied from the cylinder sensor 13 is connected to the output end of the cylinder detecting sensor 13 To determine the cylinder at the ignition timing (that is, the ignition enabled state), and determine the cylinder determination signal S ₂₂
And an ignition advance amount for determining an ignition advance basic amount Q ₀ from the engine boost pressure (ie, manifold pressure) and the engine speed and outputting it as an ignition advance basic amount signal S _3. an angular basic amount determination unit 20, the ignition advance angle correction amount signal S ₄ obtained in the fuzzy inference the spark advance correction amount Q ₁ from the temporal variation of the cylinder pressure of the engine and the previous inferred value of the ignition advance correction amount a spark advance correction quantity estimating device 30 for outputting input end to the output terminals of the ignition advance correction quantity estimating apparatus 30 of the ignition angle basic amount determination unit 20 are respectively connected to the ignition as The ignition advance basic amount signal S given from the advance basic amount determination device 20
₃ and the ignition advance correction quantity estimating device appropriately processes the spark advance correction amount signal S ₄ given from 30 (for example, added together)
To the spark advance determination device 15 for outputting determining the ignition angle Q as spark advance signal S _5, the output terminal of the ignition time detection unit 12, an output terminal and the ignition advance angle determination device of the cylinder discriminating device 14 The input terminal is connected to the 15 output terminals, and the content of the ignition time signal S ₁₂ given from the ignition time detection device 12
(I.e., the ignition time of the cylinder)
The contents of the spark advance signal S ₅ supplied from (i.e. spark advance Q) depending on corrected the corrected respective cylinders to generate an ignition control signal S ₆₁ to S ₆₆ that lasts for a predetermined rise time to the ignition time And an ignition control signal generating circuit 17 for giving to the ignition devices 16A to 16F attached to the apparatus.

The spark advance basic amount determination unit 20 includes a pressure sensor 21 for outputting a boost pressure detection signal S ₃₁ detects the boost pressure is disposed against the intake manifold of an engine (not shown) , Which is arranged for the output shaft of the engine and the number of revolutions of the engine per unit time
A rotation speed detection sensor 22 such as a rotary encoder for detecting (referred to as “engine speed”) and outputting it as an engine speed detection signal S ₃₂ , and an input terminal connected to an output terminal of the pressure sensor 21. Cage boost pressure detection signal S
An analog-to-digital converter 23 for converting the analog signal ₃₁ into a digital signal and an input terminal connected to the output terminal of the rotational speed detection sensor 22 convert the engine rotational speed detection signal _S32 from an analog signal to a digital signal. an analog digital converter 24 for, detected by the output terminal and the contents of the boost pressure detection signal S ₃₁ is input connected to the output terminal of the analog digital converter 24 (i.e. the pressure sensor 21 of the analog-to-digital converter 23 intake boost pressure) and the contents of the engine speed detecting signal S ₃₂ in the manifold (ie the rotational speed sensor
The ignition advance basic amount Q ₀ is determined as appropriate (for example, based on the conversion graph shown in FIG. 3) in accordance with the engine rotation speed detected by the ECU 22 and is output as the ignition advance basic amount signal S _3. And an ignition advance basic amount determination circuit 25.

The spark advance correction quantity estimating device 30, the pressure for outputting the cylinder pressure are respectively arranged as a cylinder pressure signal S ₄₁ detects the engine cylinder (e.g. a specific one) Sensor 31 and pressure sensor
The input terminal is connected to the output terminal of the pressure sensor 31.
And an analog-to-digital converter 32 for converting the in-cylinder pressure signal S ₄₁ from an analog signal to a digital signal, and an in-cylinder pressure applied from the analog-to-digital a change amount calculating circuit 33 for outputting calculates the temporal change amount leave temporarily holds the signal S ₄₁ as a temporal change amount signal S _42, the change amount calculation circuit
A first input terminal is connected to the output terminal of the control circuit 33. The content of the temporal change signal S (that is, the temporal change of the cylinder pressure) given from the change calculation circuit 33 is connected to the second input terminal. given spark advance correction amount of the previous inferred value Q ₁ ^* and a new spark advance correction amount Q ₁ by fuzzy inference so as to maximize the pressure within the cylinder on the basis of the calculated spark advance correction amount signal S
An ignition advance correction amount inference circuit 34 for outputting as ₄ ;
The content of the ignition advance correction amount signal S ₄ inserted between the output terminal of the ignition advance correction amount inference circuit 34 and the second input terminal and supplied from the ignition advance correction amount inference circuit 34 (that is, the ignition And a holding circuit 35 for temporarily holding the advance angle correction amount Q ₁ ) and giving it to the ignition advance angle correction amount inference circuit 34 as the previous estimated value Q ₁ ^* of the ignition advance angle correction amount.

(Operation of the First Embodiment)

The operation of the first embodiment of the ignition control device according to the present invention will be described in detail with reference to FIGS. 1 to 5K.

Determination of ignition advance basic amount

The ignition advance basic amount Q ₀ is determined in the ignition advance basic amount determination device 20 as follows.

That is, the ignition advance basic amount determination device 20
In spark advance basic amount determination circuit 25, the analog with the contents of the boost pressure detection signal S ₃₁ supplied from the pressure sensor 21 via an analog-to-digital converter 23 (i.e. the detection result of the boost pressure P _B) from the rotational speed sensor 22 the contents of the engine speed detecting signal S ₃₂ supplied through the digital converter 24 (i.e. the detection result of the engine speed R)
, The ignition advance basic amount Q ₀ is determined.

The basic ignition advance amount Q ₀ is, for example, the boost pressure P _B when the engine is operated under appropriate operating conditions.
And a conversion graph prepared in advance based on the correlation existing between the engine speed R and the ignition advance angle Q and held in the ignition advance basic amount determination circuit 25 of the ignition advance basic amount determination device 20 ( (See FIG. 3) Alternatively, it is determined by the conversion table. For example, when the conversion graph is as shown in FIG. 3, the ignition advance basic amount Q ₀ is, as shown in Table 2, when the boost pressure P _B is -300 mmHg and the engine speed R is 2000 rpm. At some point, it is determined to be 24 degrees.

Inference of ignition advance correction amount

The ignition advance correction amount Q ₁ is obtained by fuzzy inference in the ignition advance correction amount inference device 30 as follows.

That is, the ignition advance correction amount inference device 30
In the ignition advancing correction amount inference circuit 34, a fuzzy set (for example, FIG.
Fuzzy set A) and the previous inference value Q ₁ ^{* of the} ignition advance correction amount
Fuzzy sets fuzzy set (e.g. fuzzy set B in FIG. 4 (b)), relates to the spark advance correction amount Q ₁ relating
(For example, fuzzy rule f shown in Table 1)
_{1 to} f ₁₀ ), the ignition advance angle is obtained by fuzzy inference according to the temporal change amount of the detection result of the in-cylinder pressure given from the pressure sensor 31 and the previous inference value Q ₁ ^* of the ignition advance angle correction amount. obtain the correction amount Q _1. Hereinafter, fuzzy inference in the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 is shown in Table 1 which is established between the fuzzy sets A to C shown in FIGS. 4 (a) to 4 (c). be described as being performed on the basis of the fuzzy rule f ₁ ~f ₁₀ it was. Therefore, in the present invention, (i) the number of membership functions included in the fuzzy sets A to C may be increased or decreased or the shape thereof may be changed, and (ii) the fuzzy rules f _{1 to} f ₁₀ may be changed. May be increased or decreased, or the content thereof may be changed.

[0034]

[Table 1]

The fuzzy inference in the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 is based on the temporal change amount of the cylinder pressure given from the pressure sensor 31 and the previous estimated value of the ignition advance correction amount. If Q ₁ ^* is generalized and described, it involves a great deal of complexity.
The following describes, by way of example, a case in which the temporal change amount of the in-cylinder pressure and the previous inference value Q ₁ ^* of the ignition advance correction amount given from FIG.

[0036]

[Table 2]

The ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 _first relates to the fuzzy rule f1 and, based on (i) Table 1, is included in the fuzzy set A shown in FIG. membership function elect the PM _a and membership functions NM _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value PM _A1 of membership function PM _A corresponding to V
And determining as a function value NM _B1 of the membership function NM _B corresponding to the previous inferred value 5 ° of the ignition advance angle correction amount shown in FIG. _{5A (a 1) (b 1} ). Time change of cylinder pressure
Function value P of membership function PM _A corresponding to 0.5V
As is clear from FIG. 5A (a ₁ ) (b ₁ ), M _A1 is a membership function NM corresponding to the previously estimated value of 5 degrees of the ignition advance correction amount.
_Since the function value NM _{B1 of B} is zero, the ignition advancing correction amount inferring circuit 34 of the ignition advancing correction amount inferring device 30 will be described with reference to FIG.
The membership function N belonging to the fuzzy set C shown in
FIG. 5A (c ₁ ) by cutting at the position of the height PM _A1 (= 0) of L _C
A membership function NL _C ^{* 1} having a trapezoidal shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _2, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function elect the PM _a and membership functions NS _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value PM _A2 of membership function PM _A corresponding to V
The function value NS _B2 of the membership function NS _B corresponding to the previous inference value of the ignition advance correction amount of 5 degrees is obtained as shown in FIGS. 5B (a ₂ ) and 5 (b ₂ ). Time change of cylinder pressure
Function value P of membership function PM _A corresponding to 0.5V
M _A2 in FIG. _{5B (a 2) (b 2} ) is clear as the corresponding previous inferred value 5 ° of the ignition advance angle correction amount membership function NS
_Since the function value NS _{B2 of B} is zero together with the function value NS _B2 , the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 uses FIG.
The membership function N belonging to the fuzzy set C shown in
M _C Height PM _A2 (= 0) of the cut in position FIG. 5B (c ₂₎
A membership function NM _C ^{* 2} having a trapezoidal shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _3, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function elect the PM _a and membership functions PS _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value PM _A3 of membership function PM _A corresponding to V
And the function value PS _B3 of the membership function PS _B corresponding to the previous inference value of the ignition advance correction amount of 5 degrees are obtained as shown in FIGS. 5C (a ₃ ) and 5 (b ₃ ). Time change of cylinder pressure
Function value P of membership function PM _A corresponding to 0.5V
M _A3 Figure _{5C (a 3) (b 3} ) is clear as the corresponding previous inferred value 5 ° of the ignition advance angle correction amount membership function PS
_Since the function value PS _B3 is zero together with the function value PS _B3 , the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 uses FIG.
The membership function P belonging to the fuzzy set C shown in
M _C Height PM _A3 (= 0) of the cut in position FIG. 5C (c ₃₎
A membership function PM _C ^{* 3} having a trapezoidal shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _4, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function elect the PM _a and membership functions PM _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value PM _A4 of membership function PM _A corresponding to V
And the function value PM _B4 of the membership function _P MB corresponding to the previous inference value of the ignition advance correction amount of 5 degrees are obtained as shown in FIGS. DA (a ₄ ) and (b ₄ ). Time change of cylinder pressure
Function value P of membership function PM _A corresponding to 0.5V
As is clear from FIG. 5D (a ₄ ) (b ₄ ), M _A4 is a membership function PM corresponding to the previous inference value of the ignition advance correction amount of 5 degrees.
_Since the function value PM _B4 is zero together with the function value PM _B4 , the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 uses FIG.
The membership function P belonging to the fuzzy set C shown in
FIG. 5D (c ₄ ) by cutting at the position of the height PM _A4 (= 0) of L _C
As shown in ladder shape creating membership functions PL _C ^{* 4} (here, the height 0).

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _5, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function elect the PM _a and membership functions SM _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value SM _A5 of membership function SM _A corresponding to V
And determining as a function value SM _B5 membership functions SM _B corresponding to the previous inferred value 5 ° of the ignition advance angle correction amount shown in FIG _{5E (a 5) (b 5} ). Time change of cylinder pressure
Function value P of membership function SM _A corresponding to 0.5V
S _A5 in FIG. _{5E (a 5) (b 5} ) membership functions corresponding to the previous inferred value 5 degrees obvious as spark advance correction amount from NS
_Since the function value NS _B of _B is zero together with the function value NS _B5 , the ignition advance correction amount inferring circuit 34 of the ignition advance correction amount inference device 30 uses FIG.
The membership function N belonging to the fuzzy set C shown in
Cut at the position of S _C Height PS _A5 (= 0) FIG. 5E (c ₅₎
A membership function NS _C ^{* 5} having a trapezoidal shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _6, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function elect a PS _a and membership functions PS _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value PS _A6 of membership function PS _A corresponding to V
A function value PS _B6 of the membership function PS _B corresponding to the previous inference value of the ignition advance correction amount of 5 degrees is obtained as shown in FIG. 5F (a ₆ ) (b ₆ ). Time change of cylinder pressure
Function value P of membership function PS _A corresponding to 0.5V
As is clear from FIGS. 5F (a ₆ ) and (b ₆ ), the membership function PS corresponding to S _A6 corresponds to the previously estimated value of 5 degrees of the ignition advance correction amount.
_Since the function value PS _B6 is smaller than the function value PS _B6 , the ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 outputs the membership function PS _C belonging to the fuzzy set C shown in FIG.
At the position of the height PS _A6 (= 0), to create a ladder-shaped (here, height 0) membership function PS _C ^{* 6} as shown in FIG. 5F (c ₆ ).

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _7, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function NS elect the _a and membership functions NM _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value NS _A7 of membership function NS _A corresponding to V
And determining as a function value NM _B7 of the membership function NM _B corresponding to the previous inferred value 5 ° of the ignition advance angle correction amount shown in FIG. _{5G (a 7) (b 7} ). Time change of cylinder pressure
Function value N of membership function NS _A corresponding to 0.5V
As apparent from FIGS. 5G (a ₇ ) and (b ₇ ), S _A7 is a membership function NM corresponding to the previous inference value 5 degrees of the ignition advance correction amount.
_Since the function value of _B is zero together with the function value NM _B7 , the ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 uses FIG.
The membership function N belonging to the fuzzy set C shown in
The height of the S _C NS _A7 (= 0) FIG. 5G (c ₇₎ is cut at the position of
A membership function NS _C ^{* 7} having a trapezoidal shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _8, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) The selected membership function NS _A and the membership function PM _B included in the fuzzy set B shown in FIG. 4B are selected, and then (ii) the temporal change amount of the in-cylinder pressure 0.5
Function value NS _A8 of membership function NS _A corresponding to V
And the function value PM _B8 of the membership function PM _B corresponding to the previously inferred value of the ignition advance correction amount of 5 degrees are obtained as shown in FIG. 5H (a ₈ ) (b ₈ ). Time change of cylinder pressure
Function value N of membership function NS _A corresponding to 0.5V
As apparent from FIGS. 5H (a ₈ ) and (b ₈ ), S _A8 is a membership function PM corresponding to the previous inference value of the ignition advance correction amount of 5 degrees.
_Since the value of _B is zero together with the function value PM _B8 , the ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 uses FIG.
The membership function P belonging to the fuzzy set C shown in
Figure cut at a height NS _A8 (= 0) of S _C 5H (c ₈₎
A membership function PS _C ^{* 8} having a ladder shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _9, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function NM elect the _a and membership functions NS _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value NM _A9 of membership function NM _A corresponding to V
A function value NS _B9 of the membership function NS _B corresponding to the previous inference value of the ignition advance correction amount of 5 degrees is obtained as shown in FIGS. 5I (a ₉ ) and (b ₉ ). Time change of cylinder pressure
Function value N of the membership function NM _A corresponding to 0.5V
Membership function NS of M _A9 corresponds to the previous inferred value 5 degrees in FIG. _{5I (a 9) (b 9} ) is apparent from as spark advance correction amount
_Since the function value NS _B of _B is zero together with the function value NS _B9 , the ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 uses FIG.
The membership function P belonging to the fuzzy set C shown in
It was cut at a height NM _A9 (= 0) of S _C FIG. 5I (c ₉₎
A membership function PS _C ^{* 9} having a ladder shape (here, height 0) is created as shown in FIG.

The spark advance correction quantity estimating apparatus spark advance correction quantity estimating circuit 34 of the 30 relates fuzzy rule f _10, based on the first (i) Table 1, included in the fuzzy set A shown in FIGS. 4 (a) membership function NM elect the _a and membership functions PS _B included in the fuzzy set B that shown in FIG. 4 (b) being followed by (ii) the temporal variation of the cylinder pressure 0.5
Function value NM of membership function NM _A corresponding to V
FIG. 5J shows _A10 and the function value PS _B10 of the membership function PS _B corresponding to the previous inference value 5 degrees of the ignition advance correction amount.
It is determined as shown in (a ₁₀ ) and (b ₁₀ ). Membership function NM _A corresponding to the time variation of 0.5V in cylinder pressure
As shown in FIG. 5J (a ₁₀ ) (b ₁₀ ), the function value NM _A10 is zero together with the function value PS _B1 of the membership function PS _B corresponding to the previous inference value 5 degrees of the ignition advance correction amount. The ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 cuts off at the position of the height NM _A10 (= 0) of the membership function NS _C belonging to the fuzzy set C shown in FIG. Then, a membership function NS _C ^{* 10} having a trapezoidal shape (here, height 0) is created as shown in FIG. 5J (c ₁₀ ).

The ignition advance correction amount inference circuit 34 of the ignition advance correction amount inference device 30 includes the membership functions NL _C ^{* 1} , NM _C ^{* 2} , PM _C ^{* 3} , and PL _C ^{* 4} created as described above. , NS _C ^{* 5} , PS
For ^{_{C * 6, NS C * 7}} , PS C * 8, NS C * 9, NS C * 10 in enclosed hatched area, calculates the center of gravity as shown in FIG. 5K, the abscissa 3.75 degrees spark to infer the angle correction amount Q _1.

Determination of ignition advance

The ignition advance angle Q is determined by the ignition advance angle determination device 15 as follows.

That is, the ignition advance determination device 15 receives the basic ignition advance amount Q ₀ given from the ignition advance basic amount determination device 20.
And a spark advance correction quantity estimating device 30 from a given spark advance correction amount Q ₁ Tokyo, determines the spark advance as appropriate.

The ignition advance determination device 15 is provided with, for example, the basic ignition advance amount Q ₀ given from the ignition advance basic amount determination device 20.
The ignition advance angle Q is determined by adding the ignition advance angle correction amount provided from the ignition advance angle correction amount inference device 30 to each other. In the above case, the ignition advance angle Q is 27.75 degrees.

Generation of cylinder discrimination signal

The cylinder discriminating device 14 processes the detection result (that is, the cylinder detection signal S ₂₁ ) given from the cylinder detection sensor 13 to discriminate the cylinder at the ignition timing (and, consequently, the state to be ignited). and outputs it as the signal S _22.

[0054] Cylinder determination signal S ₂₂ is, for example, a signal that becomes a high level state when the cylinder is in the ignition timing (and thus the condition to be ignited), are generated for each cylinder.

Generation of ignition control signal

The ignition control signals S _{61 to} S ₆₆ are generated in the ignition control signal generator 17 as follows.
16A to 16F.

That is, the ignition control signal generator 17 outputs the ignition timing detected by the ignition time detector 12 from the crank angle detected by the crank angle detection sensor 11 to the ignition advance Q given by the ignition advance determination device 15. (In the above case, the ignition time is advanced by a time corresponding to the ignition advance angle of 30.75 degrees), and the ignition control signal S is added to the corrected ignition time (ie, the corrected ignition time).
₆₁ to S ₆₆ were generated, the ignition device 16A of attaching a cylinder detection signal S ₂₁ which is detected by the cylinder detecting sensor 13 to the cylinder is determined by processing by a cylinder discriminating device 14
Give to ~ 16F.

(Second Embodiment)

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

In the second embodiment, the rotational speed detection sensor 22 and the analog-to-digital converter 24 are eliminated, and the ignition advance basic amount determining device 20 uses the pressure sensor 21, the analog-to-digital converter 23 and the ignition advance basic amount determination device 20. Except for being constituted by the circuit 25, it has substantially the same configuration as the first embodiment. In this case, the spark advance basic amount determination circuit 25 for conversion chart or conversion table held in the presence between the boost pressure P _B when operating the engine with spark advance Q at appropriate operating conditions However, for example, the conversion graph shown in FIG. 3 when the engine speed is 2000 rpm may be used instead.

In other words, the second embodiment has substantially the same operation and effect as the first embodiment except that the configuration of the ignition advance basic amount determination device 20 is simplified. .

Therefore, for simplicity of description, elements corresponding to elements included in the first embodiment are given the same reference numerals as in the first embodiment, and other elements are denoted by the same reference numerals. Detailed description is omitted.

(Third Embodiment)

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

In the second embodiment, the pressure sensor 21 and the analog-to-digital converter 23 are eliminated, and the ignition advance basic amount determining device 20 uses the rotation speed detection sensor 22, the analog-to-digital converter 24, and the ignition advance basic amount determination. Except for being constituted by the circuit 25, it has substantially the same configuration as the first embodiment. In this case, the conversion graph or conversion table held in the ignition advance basic amount determination circuit 25 exists between the engine speed R and the ignition advance Q when the engine is operated under appropriate operating conditions. However, for example, the conversion graph shown in FIG. 3 when the boost pressure is -300 mmHg may be used instead.

In other words, the third embodiment has substantially the same operation and effect as the first embodiment except that the configuration of the ignition advance basic amount determination device 20 is simplified. .

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

(Fourth to Sixth Embodiments)

The configuration and operation of the fourth to sixth embodiments of the ignition control device according to the present invention will be described in detail with reference to FIGS. 1 and 7.

In the fourth to sixth embodiments, the fuzzy rules f _{1 to} f ₁₀ shown in Table 1 of fuzzy inference in the ignition advancing correction amount inference circuit 34 of the ignition advancing correction amount inference device 30 are shown in Table 3.
Fuzzy rule g _1, except that it is substituted with to g _27, has substantially the same configuration as the first to third embodiments respectively shown in.

In other words, in the fourth to sixth embodiments,
Except for the refinement of the configuration of the ignition advance correction amount inference device 30 , each has substantially the same operation and effect as the first to third embodiments.

Therefore, in order to simplify the description, the drawings are not particularly illustrated, and the drawings used in the first to third embodiments are substituted.

[0073]

[Table 3]

(Modification)

In the above description, the fuzzy inference is performed by cutting off the top of the membership function to find the center of gravity. However, the present invention is not limited to this, and the present invention is not limited to this. It also covers cases where fuzzy inference is performed (eg, 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.

[0076]

The ignition control device according to the present invention generates an ignition control signal and supplies it to the ignition device provided in the cylinder of the engine, as specified in the column of [Means for Solving the Problems]. In particular, (a) a first pressure sensor that is provided for an intake manifold of the engine and detects and outputs boost pressure, and (b) is provided for an output shaft of the engine. A rotation speed detection sensor for detecting the rotation speed of the output shaft of the engine and outputting the detected rotation speed as an engine rotation speed; and (c) an output terminal of the first pressure sensor and an output terminal of the rotation speed detection sensor. The input terminal is connected to at least one of the first and second ignition timings. Based on at least one of the boost pressure given from the first pressure sensor and the engine speed given from the rotation speed detection sensor, the ignition advance basic Determine the amount (D) a second pressure sensor disposed in the cylinder of the engine for detecting and outputting the pressure in the cylinder of the engine, and (e) A change amount calculation circuit connected to the second pressure sensor for calculating a temporal change amount of the in-cylinder pressure detected by the second pressure sensor; and (f) an output of the change amount calculation circuit. The input end is connected to the end, and it is established between a fuzzy set related to the time variation of the cylinder pressure, a fuzzy set related to the previous estimated value of the ignition advance correction amount, and a fuzzy set related to the ignition advance correction amount. Fuzzy inference based on the fuzzy rules and the temporal change of the cylinder pressure given to the input from the change calculation circuit and the previous estimated value of the ignition advance correction given to the other input. Ignition advance correction An ignition advance correction amount inference circuit for determining the amount of the ignition advance correction amount inference circuit, which is disposed between the output end of the ignition advance correction amount inference circuit and the other input end. A holding circuit for holding the output ignition advance correction amount and outputting it as a previous inference value of the ignition advance correction amount; (h) an output terminal of an ignition advance basic amount determination circuit and an ignition advance correction amount inference circuit; The input end is connected to the output end of the ignition advance basic amount and the ignition advance correction amount provided from the ignition advance correction amount inference circuit. An ignition advancing angle determination device for determining an ignition advancing angle on the basis of the ignition advancing angle when the in-cylinder pressure of the engine increases and decreasing the advancing angle when the in-cylinder pressure of the engine decreases. (I) The pressure in the cylinder is It has the effect of maximizing and (ii) the effect of improving combustion efficiency.

[Brief description of the drawings]

FIG. 1 shows first to sixth ignition control devices according to the present invention.
FIG. 3 is a block circuit diagram for commonly showing the embodiment of FIG.

FIG. 2 is a block circuit diagram showing a first and a fourth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. 1;

FIG. 3 is a graph for explaining the operation of the first and fourth embodiments shown in FIG. 2;

FIG. 4 is a graph for explaining the operation of the first and fourth embodiments shown in FIG. 2;

FIG. 5A is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5B is a graph for explaining the operation of the first embodiment shown in FIG. 2;

5C is a graph for explaining the operation of the first embodiment shown in FIG. 2. FIG.

FIG. 5D is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5E is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5F is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5G is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5H is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5I is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5J is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 5K is a graph for explaining the operation of the first embodiment shown in FIG. 2;

FIG. 6 is a block circuit diagram showing a second and a fifth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. 1;

FIG. 7 is a block circuit diagram showing a third and a sixth embodiment of the ignition control device according to the present invention by enlarging a part of the block circuit diagram shown in FIG. 1;

[Description of Signs] 10・ ・ ・ ・ ・ ・ ・ ・ ・ Ignition control device 10A・ ・ ・ ・ ・ ・ ・ Ignition Lead angle generator 11 ... Crank angle detection sensor 12 ... Ignition time detector 13 Cylinder detection sensor 14 Cylinder Discriminator 15 ・ ・ ・ Ignition advance angle determination device 16A-16F ・ ・ ・ ・ Ignition device 17 ........................... Ignition advance control signal generator 20 ... Ignition advance basic Volume determination device 21 Pressure sensor 22 ... Rotation speed detection sensor 23 ... Analog-to-digital converter 24 ...・ ・ ・ Analog-to-digital converter 25 ・ ・ ・ ・ ・ ・ ・ ・ ・ Ignition advance basic amount determination circuit 30・ ・ ・ ・ ・ ・ ・ ・ ・・ ・ ・ ・ ・ ・ ・ Ignition advance correction amount inference device 31 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Pressure sensor 32 ・ ・ ・・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Analog-to-digital converter 33 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Change amount calculation circuit 34 ・ ・ ・ ・ ・........... Ignition advance correction amount inference circuit 35

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02P 5/153

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) disposed in an intake manifold of the engine to detect a boost pressure; A first pressure sensor (21) for detecting the rotation speed of the output shaft of the engine, and detecting the rotation speed of the output shaft of the engine and outputting the detected rotation speed as the engine rotation speed. A number detection sensor (23),
(c) An input terminal is connected to at least one of the output terminal of the first pressure sensor (21) and the output terminal of the rotation speed detection sensor (23), and the input terminal is connected to the first pressure sensor (21). An ignition advance basic amount determining circuit () for determining and outputting an ignition advance basic amount based on at least one of the given boost pressure and the engine speed given from the rotation speed detection sensor (23). 25), (d) a second pressure sensor (31) arranged in the cylinder of the engine for detecting and outputting the pressure in the cylinder of the engine, and (e) a second pressure sensor (3).
A change amount calculation circuit (33), which is connected to (1) and calculates a time change amount of the cylinder pressure detected by the second pressure sensor (31); and (f) a change amount calculation circuit. The input end is connected to the output end of (33), and the fuzzy set for the temporal change in the cylinder pressure, the fuzzy set for the previous inference value of the ignition advance correction amount, and the fuzzy set for the ignition advance correction amount Based on the fuzzy rules established between the above and the previous inference of the temporal change amount of the cylinder pressure applied to the input terminal from the change amount calculation circuit (33) and the ignition advance correction amount applied to the other input terminals The ignition advance correction amount inference circuit (34) for obtaining the ignition advance correction amount by fuzzy inference according to the value, and (g) the output terminal of the ignition advance correction amount inference circuit (34) and other inputs The ignition advance output from the ignition advance correction amount inference circuit (34). Holding circuit for holding the correction amount is output as a previous inferred value of the ignition advance correction amount
(35) and (h) input terminals are connected to the output terminal of the ignition advance basic amount determination circuit (25) and the output terminal of the ignition advance correction amount inference circuit (34), and the ignition advance An ignition advance angle for determining an ignition advance angle based on the ignition advance basic amount given from the basic amount determination device (25) and the ignition advance correction amount given from the ignition advance correction amount inference circuit (34). An ignition control device comprising: a determination device (15).