JPH02188644A - Fuel injection controller - Google Patents

Abstract

PURPOSE:To enable the immediate response to a load fluctuation as well as the precise fuel control by inferring fuel supply quantity, based on various operation parameters and fuzzy inference, and obtaining injection time from both this fuel supply quantity and an injection time-instant detection value, thereby controlling a fuel injection system. CONSTITUTION:Inferring devices 201 to 203, which infer a basic fuel supply quantity, increased fuel supply quantity, and corrected fuel supply quantity, based on those selected out of various parameters on engine operation, are provided, so that the fuel supply quantity can be determined by a determining device 204, based on the results of inference drawn by the devices 201 to 203. In addition, a fuel injection time signal is outputted from a volt-time converter 601, based on the output from both determining device 294 and fuel injection time-instant detecting device 301. When no fuel supply cut-off signal is given by a cut-off inferring device 501, a fuel injection control signal is outputted from a fuel injection control signal generating device 801 to a fuel injection system 701 of a cylinder designed through the output from a cylinder discriminating device 401.

Description

Detailed Description of the Invention (1) Purpose of the Invention [Industrial Field of Application 1] The present invention relates to a fuel injection control device, and particularly relates to a fuel injection control device that uses fuzzy inference to determine the amount of fuel supplied from the opening degree of a throttle valve, etc. The present invention relates to a fuel injection control device that generates a fuel injection control signal and applies it to a fuel injection device in response to the generated fuel injection control signal.

[Prior Art] Conventionally, as this type of fuel injection control device, the throat of the fuel injection control device 10A shown in FIG. The throttle valve opening change detected by the throttle valve opening change detection sensor 102, the engine rotation speed detected by the engine rotation speed detection sensor 103, and the air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor 104. Air supply amount and oxygen concentration detection sensor 105
The oxygen concentration in the air supplied to the combustion chamber of the engine detected by , the exhaust gas oxygen concentration detected by exhaust gas oxygen concentration detection sensor 106 , and the engine coolant temperature detection sensor 1
07, the fuel temperature detected by the fuel temperature detection sensor 108, the temperature of the air supplied to the combustion chamber of the engine detected by the air temperature detection sensor 109, and the voltage fluctuation detection sensor 110. The detected voltage fluctuation of the storage battery is converted into an analog-to-digital converter 90.
1. ~． 91O into a digital signal, and (
ii) The crank angle detected by the crank angle detection sensor 111 and the cylinder detected by the cylinder detection sensor 112 are counted by counters 911 and 912, respectively, and (iii)
) It has been proposed that these signals are sequentially given to a fuel injection control signal generation device 913 and subjected to appropriate processing to generate a fuel injection control signal, which is then given to a fuel injection device 701 disposed in the engine. .

Therefore, it is an object of the present invention to provide a fuel injection control device that infers and determines the fuel supply amount and provides it to the fuel injection device as a fuel injection control signal.

[Problems to be Solved] However, in the conventional fuel injection control device 10A, the throttle valve opening detected by the throttle opening detection sensor 101 is all converted to the analog-to-digital converter 90.
1. ~． 91O or the like, or counted by counters 911 and 912, the signals are sequentially read into the fuel injection control signal generator 913 and subjected to appropriate arithmetic processing to generate the fuel injection control signal. i) It has the drawback of requiring a large amount of time for signal processing, and furthermore, (ii) it has the drawback of not being able to quickly respond to engine load fluctuations and achieve precise fuel injection control.

Therefore, in order to eliminate these drawbacks, the present invention uses fuzzy inference from the throttle valve opening detected by the throttle valve opening detection sensor. The solution to the problem is [(a)
The throttle valve opening detected by the throttle valve opening detection sensor (1011), the throttle valve opening change detected by the throttle valve opening change detection sensor (1021), and the engine rotation speed detection sensor (103). the engine rotational speed detected by the engine, the amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor (1041), and the amount of air supplied to the combustion chamber of the engine detected by the oxygen concentration detection sensor (105). the oxygen concentration in the air, the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor f1061, the engine coolant temperature detected by the engine coolant temperature detection sensor (107), and the fuel temperature detection sensor. The temperature of the fuel supplied to the combustion chamber of the engine detected by (108), the temperature of the air supplied to the combustion chamber of the engine detected by the air temperature detection sensor (1G91), and the detection of the voltage fluctuation detection sensor (110) (b) a fuel supply amount inference device (201, 202, 203, 204) for inferring and determining the fuel supply amount by fuzzy inference based on one of the selected voltage fluctuations of the condenser;
An injection time detection device (3011) for detecting the fuel injection time from the crank angle detected by the crank angle detection sensor (111), (cl fuel supply amount inference device T2O1,
a voltage-time conversion device (601) for converting the fuel supply amount determined by 202, 203, and 2041 into a fuel injection time starting from the injection time detected by the injection time detection device (3011); (d) voltage-time conversion A fuel injection control system comprising a fuel injection control signal generating device (8011) that generates a fuel injection control signal according to the fuel injection time converted by the device (6011) and supplies it to a fuel injection device (701) disposed in the engine. ``device''.

[Function] The fuel injection control device according to the present invention has (a) the throttle valve opening detected by the throttle valve opening detection sensor (1011) and the throttle valve opening detected by the throttle valve opening change detection sensor (1021). Opening change and engine rotation speed detection sensor (103)
The engine speed detected by the engine speed, the amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor (104), and the oxygen concentration detection sensor (104).
The oxygen concentration in the air supplied to the combustion chamber of the engine detected by 051 and the exhaust gas oxygen concentration detection sensor (
106) and the oxygen concentration in the exhaust gas detected by
The temperature of the engine coolant detected by the engine coolant temperature detection sensor (1071) and the temperature of the engine coolant detected by the engine coolant temperature detection sensor (1081)
The temperature of the fuel supplied to the combustion chamber of the engine detected by the air temperature detection sensor (109), the temperature of the air supplied to the combustion chamber of the engine detected by the air temperature detection sensor (109), and the temperature of the condenser detected by the voltage fluctuation detection sensor (1101). A fuel supply amount inference device (2) for inferring and determining the fuel supply amount by fuzzy inference based on at least one selected from voltage fluctuations.
01, 202, 203, 204) and (b) an injection time detection device (301) for detecting the fuel injection time from the crank angle detected by the crank angle detection sensor (Ill).
) and (cl fuel supply amount inference device (201, 202, 2
03, 204) into a fuel injection time starting from the injection time detected by the injection time detection device (301).
1) and (d) a fuel injection control signal generation device that generates a fuel injection control signal according to the fuel injection time converted by the voltage time conversion device (6011) and supplies it to the fuel injection device (701) disposed in the engine. (801), it has the function of determining the amount of fuel to be injected in a short time, and furthermore, it can precisely control the amount of fuel to be injected in immediate response to engine load fluctuations, etc. It has the effect of regulating the

[Example] Next, the fuel injection control device according to the present invention will be specifically described by citing preferred examples thereof. However, the examples described below are described to facilitate or accelerate the understanding of the present invention, and are not described to limit the present invention. In other words, each member disclosed in the embodiments described below includes all design changes and equivalent substitutions that fall within the spirit and technical scope of the present invention.

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

First, the configuration of an embodiment of the fuel injection control device according to the present invention will be described in detail with reference to FIG.

In the following, for convenience, the fuel injection control device according to the present invention will be mainly explained along the case where it is applied to a gasoline engine, but the fuel injection control device according to the present invention is not limited to this. For example, when applied to a diesel engine, unnecessary members (eg, throttle valve opening detection sensor 101, etc.) may be removed as appropriate.

IO is a fuel injection control device according to the present invention, and detects the opening degree of a throttle valve (not shown) disposed in a carburetor (not shown) attached to an engine (not shown). a throttle valve opening detection sensor 101 for detecting the amount of change in the opening of the throttle valve, a throttle valve opening change detection sensor 102 for detecting the amount of change in the opening of the throttle valve, and an engine rotational speed for detecting the number of rotations per unit time of the engine. A detection sensor 103 and an air supply amount detection sensor 104 for detecting the flow rate (i.e., supply amount) of air being supplied to the carburetor and eventually to the combustion chamber of the engine. An oxygen concentration detection sensor 105 for detecting the oxygen concentration in the air, an exhaust gas oxygen concentration detection sensor 106 for detecting the oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine, and an exhaust gas oxygen concentration detection sensor 106 for detecting the oxygen concentration in the exhaust gas discharged from the combustion chamber of the engine. An engine coolant temperature detection sensor 107 for detecting the temperature, a fuel temperature detection sensor 108 for detecting the temperature of the fuel being supplied to the carburetor and eventually to the combustion chamber of the engine, and an air temperature detection sensor 109 for detecting the temperature of the supplied air; a voltage fluctuation detection sensor 110 for detecting voltage fluctuations of a capacitor disposed to ignite fuel in the combustion chamber of the engine; A crank angle detection sensor Ill for detecting the angle of the crank; and a cylinder detection sensor 112 disposed at a predetermined position of the cylinder (for example, the top dead center position) and for detecting that the piston has reached the predetermined position. It is equipped with

Further, the fuel injection control device pressure according to the present invention is determined by the throttle valve opening detection sensor 101, the throttle valve opening change detection sensor 102, and the engine rotation speed detection sensor 103.
is connected to the air supply Mffi detection sensor 104, the oxygen concentration detection sensor 105, and the exhaust gas oxygen concentration detection sensor 106. The detection result of the throttle valve opening change given by the throttle valve opening change detection sensor 102, the detection result of the engine rotation speed given by the engine rotation speed detection sensor 103, and the air given from the air supply amount detection sensor 104. Based on the detection result of the supply amount, the detection result of the oxygen concentration given from the oxygen concentration detection sensor 105, and the detection result of 1 degree of oxygen in the exhaust gas given from the exhaust gas oxygen concentration detection sensor 106, the basic fuel is determined by fuzzy reasoning. Basic fuel supply amount inference device 201 for inferring and determining the supply amount
It is equipped with

The fuel injection control device according to the present invention is connected to a throttle valve opening detection sensor 101, a throttle valve opening change detection sensor 102, an engine rotation speed detection sensor 103, and an engine coolant temperature detection sensor 107. The detection result of the throttle valve opening degree given from the valve opening degree detection sensor 101, the detection result of the throttle valve opening degree change given from the throttle valve opening degree change detection sensor 102, and the engine rotation speed detection sensor 103. The increased fuel supply amount is determined by inferring the increased fuel supply amount using fuzzy inference from the detection result of the given engine rotation speed and the detection result of the engine coolant temperature given from the engine coolant temperature detection sensor 107. It is equipped with an inference device 202.

The fuel injection control device according to the present invention is connected to a fuel temperature detection sensor 108, an air temperature detection sensor 109, and a voltage fluctuation detection sensor 110, and receives the fuel temperature detection result given from the fuel temperature detection sensor 108. Correction for inferring and determining the corrected fuel supply amount by fuzzy reasoning from the air temperature detection result given from the air temperature detection sensor 109 and the voltage fluctuation detection result of the capacitor given from the voltage fluctuation detection sensor 110. Fuel supply amount inference device 2
It is equipped with 03.

The fuel injection control device pressure according to the present invention is connected to a basic fuel supply amount inference device 201, an increased fuel supply amount inference device 202, and a corrected fuel supply amount inference device 203, and is given from the basic fuel supply amount inference device 201. Based on the inference result of the basic fuel supply amount given, the inference result of the increased fuel supply amount given from the increased fuel supply amount inference device 202, and the inference result of the corrected fuel supply amount given from the corrected fuel supply amount inference device 203, A fuel supply amount determining device 204 is provided for determining the amount of fuel to be supplied to the combustion chamber of the engine.

Further, the fuel injection control device according to the present invention is connected to the crank angle detection sensor Ill, and is configured to detect the fuel injection time given from the crank angle detection sensor 111 (i.e., when fuel should be injected into the combustion chamber of the engine). time)
an injection time detection device 301 for detecting the injection time, a cylinder discrimination device 401 connected to the cylinder detection sensor 112 for determining which cylinder should inject fuel, and a throttle valve opening detection sensor 101 and the throttle valve opening. The throttle valve opening detection sensor 101 is connected to the change detection sensor 102 and the engine rotation speed detection sensor 103.
The detection result of the throttle valve opening degree given from the throttle valve opening degree change detection sensor 102 , the detection result of the throttle valve opening degree change given by the throttle valve opening degree change detection sensor 102 , and the detection result of the engine rotation rate given from the engine rotation rate detection sensor 103 and a fuel supply cutoff inference device 501 for inferring whether or not the fuel supply should be cut off by fuzzy reasoning based on the result and generating a fuel supply cutoff signal when it is determined that the fuel supply should be cut off. . In the case where there is a single cylinder, the cylinder discriminating device 401 may be removed, but for convenience of explanation, the explanation will be made assuming that a plurality of cylinders are identified and the cylinder discriminating device 401 is provided.

The fuel injection control signal generating device 801 is also provided.

In addition, for the fuel injection control device according to the present invention.

The voltage signal, which is connected to the fuel supply amount determination device 204 and the injection time detection device 301 and indicates the inference result of the fuel supply amount given from the fuel supply amount determination device 204, is connected to the injection time given from the fuel injection time detection device 301. The fuel supply cutoff inference device is connected to a voltage time conversion device 601 for converting into a time signal starting from time, that is, a fuel injection time signal, a cylinder discrimination device 401, a fuel supply cutoff inference device 501, and a voltage time conversion device 601. When the fuel supply cutoff signal is not given from the cylinder discrimination device 401, the fuel injection time given by the voltage time conversion device 601 is such that fuel is injected and supplied to the cylinder designated by the cylinder discrimination signal given from the cylinder discrimination device 401. A fuel injection control signal is generated in response to the signal and applied to the fuel injection device 701.The operation of an embodiment of the fuel injection control device according to the present invention will be described in detail with further reference to FIG.

The basic fuel supply amount of the basic fuel supply amount is inferred and determined by the following (fuzzy inference) in the basic fuel supply amount inference device 201.

That is, the basic fuel supply amount inference device 201 uses the detection result of the throttle valve opening given from the throttle valve opening detection sensor 101 and the throttle valve opening given from the throttle valve opening change detection sensor 102. The fuzzy rules f, ~f'+t shown in Table 1 (al) that hold true between the change detection results and the basic fuel supply amount
Use this to infer and find the basic fuel supply amount. here,
For convenience of explanation below, this basic fuel supply amount is shown in Table 1 (a
) is shown as “basic fuel supply amount (A)” as shown in the conclusion part,
In addition, the inference results of the basic fuel supply amount obtained by inference using the fuzzy rules f, ~f17 of Table 1 (at) are also shown in Table 1.
The condition part of the table (bl) is shown as <°゛Basic fuel supply amount inference result (Al'').

Thereafter, the basic fuel supply amount inference device 201 determines that the basic fuel supply amount is established between the inference result (Al), the detection result of the engine rotation speed given from the engine rotation speed detection sensor 107, and the basic fuel supply amount. The basic fuel supply amount is inferred and determined using the fuzzy rule fit-f2s shown in Table 1 (bl).Here, for the convenience of the following explanation, this basic fuel supply amount is calculated using the fuzzy rule fit-f2s shown in Table 1 (b). At the end of the conclusion section (denoted as ``basic fuel supply amount (Bl''), the inference result of the basic fuel supply amount obtained by inference using the fuzzy rules f'z+~f21 in Table 1 (bl) is similarly shown. Table 1 (condition part of cl <°゛Basic fuel supply amount inference result +81'' is shown.

2 l-L no L force two animals-LJL Shiri Furthermore, the basic fuel supply amount inference device 2 old uses the inference result (B) of the basic fuel supply amount, the inference result of the oxygen concentration in the combustion chamber described later, and the basic Table 1 (cl
The basic fuel supply amount is inferred and determined using the fuzzy rules f31 to f3B shown in FIG. Here, for the convenience of the following explanation, this basic fuel supply amount is shown in Table 1 (C1) ("Basic fuel supply amount (C1"), and the fuzzy rules f !1 to f□ of Table 1 (cl) The inference result of the basic fuel supply amount obtained by inference using is similarly indicated as ``Basic fuel supply amount inference result (C1'').

The oxygen concentration in the combustion chamber of the engine is determined by the basic fuel supply amount inference device 201 based on the detection result of the air supply amount given from the air supply amount detection sensor 104 and the oxygen concentration in the air given from the air oxygen concentration detection sensor 105. The fuzzy rules g1 to g+4 shown in Table 2 (al) that hold true between the detection result of the oxygen concentration in the combustion chamber, the detection result of the engine rotation speed given from the engine rotation speed detection sensor 103, and the oxygen concentration in the combustion chamber Here, for the convenience of the following explanation, the oxygen concentration in the combustion chamber is expressed as <゛°Oxygen concentration in the combustion chamber (Al'') as shown in the conclusion section of Table 2 (al). and Table 2 (al's fuzzy rules g
Similarly, the inference results of the oxygen concentration in the combustion chamber obtained by inference using 1 to g14 are shown in Table 2 (for each condition part of bl (shown as "inference result of the oxygen concentration in the combustion chamber (Al").

Thereafter, the oxygen concentration in the combustion chamber of the engine is determined by the basic fuel supply amount inference device 201 based on the inference result (A) of the oxygen concentration in the combustion chamber and the detection of the exhaust gas oxygen concentration given from the exhaust gas oxygen concentration detection sensor 106. It is appropriately inferred and obtained using the fuzzy rule g+s"'-g+t shown in Table 2 (bl) that holds true between the result and the oxygen concentration in the combustion chamber.Here, for the convenience of the following explanation, , the oxygen concentration in the combustion chamber is shown in Table 2 (as shown in the conclusion part of BL ('Oxygen concentration in the combustion chamber (B)'), and Table 2 (b)
The inference result of the oxygen concentration in the combustion chamber obtained by inference using the fuzzy rules g, ~g14 is also shown as "inference result (B) of the oxygen concentration in the combustion chamber."

The increased fuel supply amount of 1 RO fuel S and ffi is inferred and determined by the following (fuzzy inference) in the increased fuel supply amount inference device 202.

That is, the increased fuel supply amount inference device 202 uses the detection result of the throttle valve opening given from the throttle valve opening detection sensor 101 and the throttle valve opening change given from the throttle valve opening change detection sensor 102. The increased fuel supply amount is inferred and determined using the fuzzy rule shown in Table 3 (al), which is established between the detection result of and the increased fuel supply amount. For convenience, this increased fuel supply amount is shown in Table 3 (a).
In the conclusion part of
In addition, the inference results for the increased fuel supply amount obtained by inference using the fuzzy rules hll~hat in Table 3 (al) are similarly shown in Table 3 (the inference results for the increased fuel supply amount ( Al”.

After that, the increased fuel supply amount inference device 202 calculates the increased fuel supply amount inference result (Al) and the engine speed given from the engine speed detection sensor 103. The fuzzy rules hz+ to h shown in Table 3 (bl) that hold true between the detection result, the detection result of the engine coolant temperature given from the engine coolant temperature detection sensor 107, and the increased fuel supply amount
0 is used to infer and determine the increased fuel supply amount. Here, for convenience of explanation below, this increased fuel supply amount is shown in Table 3 f.
For the conclusion part of b) (denoted as “increased fuel supply amount (Bl)”, and the inference result of the increased fuel supply amount obtained by inference using the fuzzy rule hat~h□ of Table 3 (at) It is shown as “Inference result of increased fuel supply amount (B)”.

The corrected fuel supply amount for the normal fuel supply amount is determined by the corrected fuel supply amount inference device 203 by performing fuzzy inference as follows.

That is, the increased fuel supply amount inference device 203 uses the fuel temperature detection result given from the fuel temperature detection sensor 108,
The results shown in Table 4 are established between the air temperature detection result given from the air temperature detection sensor 109, the voltage fluctuation detection result of the capacitor given from the voltage fluctuation detection sensor 110, and the corrected fuel supply amount. The corrected fuel supply amount is inferred and determined using the fuzzy rule j+-je.

Fuel supply Pm? The constant fuel supply amount is determined by the fuel supply amount determination device 204 as follows.

That is, the fuel supply amount determination device 204 uses the inference result (C) of the basic fuel supply amount given from the basic fuel supply amount inference device 201 and the inference result (C) of the increased fuel supply amount given from the increased fuel supply amount inference device 202. fB) and the inference result of the corrected fuel supply amount given by the corrected fuel supply amount inference device 203, the fuel supply amount is determined by a well-known method such as the centroid method using a membership function, for example.

II Theory of Summer U (Fuel Supply, ゛) Whether or not to cut off the fuel supply is determined by the following fuzzy reasoning in the fuel supply cutoff inference device 501.

That is, the fuel supply cutoff inference device 501 uses the detection result of the throttle valve opening given from the throttle valve opening detection sensor 1 and the throttle valve opening change given from the throttle valve opening change detection sensor 102. According to the fuzzy rules shown in Table 5, which are established between the detection result of the engine rotation speed given from the engine rotation speed detection sensor 103 and the fuel supply,
Use this to infer whether or not to cut off the fuel supply.

When a fuel supply cutoff is desired, a fuel supply cutoff signal is generated by the fuel supply cutoff inference device 501.

The fuel supply amount determined by the raw fuel supply amount determination device 204 for two combustion injections and plasters is given to the voltage time conversion device 601, and is applied to the crank angle given from the crank angle detection sensor ill. Accordingly, it is converted into a fuel injection time signal starting at the injection time detected by the fuel injection time detection device 301.

The fuel injection time signal is generated by the fuel injection control signal generator 801.
Unless a fuel cutoff signal is given from the fuel supply cutoff inference device 501, fuel injection is performed as a fuel injection control signal according to the cylinder signal given from the cylinder detection sensor 112 and discriminated by the cylinder discrimination device 401. device 801. The fuel injection device 801 sends the fuel supply amount determining device 2 to the cylinder corresponding to the cylinder signal.
The amount of fuel corresponding to the fuel supply amount determined by 04 and the fuel injection time signal is injected.

On the other hand, when the fuel supply cutoff signal is given from the fuel supply cutoff inference device 501, the fuel injection time signal is not given to the fuel injection device 701 as a fuel injection control signal from the fuel injection control signal generation device 801.

In the above description, a case has been described in which the corrected fuel supply amount is inferred by the corrected fuel supply amount inference device 203, but the present invention is not limited to this. It also includes cases where

Furthermore, although a case has been described in which the increased fuel supply amount is inferred by the increased fuel supply amount inference device 202, the present invention is not limited to this, and also includes a case where the increased fuel supply amount inference device is removed. ing.

Furthermore, although a case has been described in which the cylinder discrimination device 401 is provided, the present invention is not limited to this, and it is also possible to eliminate this in cases where the number of cylinders is single. .

Although a case has been described in which the fuel supply cutoff inference device 501 is additionally provided, the present invention is not limited to this (this may be removed as desired).

(3) Effects of the Invention As is clear from the above description, the fuel control injection device according to the present invention has the following functions: Changes in the opening of the throttle valve detected by the sensor (102), engine speed detected by the engine speed detection sensor (103), and the engine combustion chamber detected by the air supply amount detection sensor (104) The amount of supplied air, the oxygen concentration in the air supplied to the combustion chamber of the engine detected by the oxygen concentration detection sensor (1051), and the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor (1061) Oxygen concentration and engine coolant temperature detection sensor (10
7), the temperature of the engine cooling water detected by the fuel temperature detection sensor (108), the temperature of the fuel supplied to the engine combustion chamber detected by the air temperature detection sensor (1091), and the temperature of the fuel supplied to the engine combustion chamber detected by the air temperature detection sensor (1091). The amount of fuel supplied to infer and determine the amount of fuel supplied by fuzzy inference based on one of the temperature of the air being detected and the voltage fluctuation of the capacitor detected by the voltage fluctuation detection sensor (110). Determination device (201, 202, 203
, 204) and (b) crank angle detection sensor (111
The fuel supply amount determined by the injection time detection device (3011) for detecting the fuel injection time from the crank angle detected by (c) the fuel supply amount determination device (201, 202, 203, 204) is Time detection device (301
A voltage time converter (6011) for converting the detected injection time into a fuel injection time starting from the injection time detected by the dl voltage time converter (6011) generates a fuel injection control signal according to the fuel injection time converted by the (i) The amount of fuel to be injected can be determined in a short time. This has the effect of making it possible to precisely adjust the fuel injection amount in response to changes in engine load, etc.

lO...Fuel injection control device lO1...
...Throttle valve opening detection sensor 102...
・Throttle valve opening change detection sensor...Engine speed detection sensor...Air supply amount detection sensor...Oxygen concentration detection sensor...Exhaust gas oxygen concentration Detection sensor...
Engine coolant temperature detection sensor...Fuel temperature detection sensor...Air temperature detection sensor...Voltage fluctuation detection sensor...Crank angle detection sensor...・Cylinder detection sensor

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a fuel injection control device according to the present invention, and FIG. 2 is a circuit diagram showing a conventional example. 201...Basic fuel supply amount inference device 202...
... Increased fuel supply amount inference device 203 ... Corrected fuel supply amount inference device ... Fuel supply amount determination device ... Injection time detection device ... Cylinder Discrimination device...Fuel supply cutoff inference device...Voltage time conversion device...t! Ii fuel injection device

Claims (1)

[Scope of Claims] (a) The throttle valve opening detected by the throttle valve opening detection sensor (101) and the throttle valve opening change detected by the throttle valve opening change detection sensor (102). , the engine rotation speed detected by the engine rotation speed detection sensor (103),
The amount of air supplied to the combustion chamber of the engine detected by the air supply amount detection sensor (104) and the oxygen concentration in the air supplied to the combustion chamber of the engine detected by the oxygen concentration detection sensor (105) , the oxygen concentration in the exhaust gas detected by the exhaust gas oxygen concentration detection sensor (106), the engine coolant temperature detected by the engine coolant temperature detection sensor (107), and the fuel temperature detection sensor (108). The temperature of the fuel supplied to the combustion chamber of the engine detected, the temperature of the air supplied to the combustion chamber of the engine detected by the air temperature detection sensor (109), and the temperature of the condenser detected by the voltage fluctuation detection sensor (110). A fuel supply amount inference device (201, 202) for inferring and determining the fuel supply amount by fuzzy inference based on at least one selected from voltage fluctuations.
, 203, 204), (b) an injection time detection device (301) for detecting the fuel injection time from the crank angle detected by the crank angle detection sensor (111), and (c) a fuel supply amount inference device (201). , 202, 203,
(d) a voltage-time conversion device (601) for converting the fuel supply amount determined by (204) into a fuel injection time starting from the injection time detected by the injection time detection device (301); A fuel injection control signal generating device (80) generates a fuel injection control signal according to the fuel injection time converted by
1) A fuel injection control device comprising: