JPS61160545A - Controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To permit the smooth operation of an internal-combustion engine by installing an injection. ignition control means which carries-out fuel injection control and ignition control on the basis of the judging means which judges the count value of a counter and the application of a standard position signal. CONSTITUTION:The first judging means 3 for judging the count value of a counter 2 varies from the first set value to the initial value or not is installed. The second judging means 4 for judging if either of the first or the second standard position signal is applied from a turning-angle sensor 1 is installed. A control means 6 for setting the count value of the counter 2 as the initial value on condition that the first or the second standard position signal is generated. An injection ignition control means 7 which carries-out fuel injection control and ignition control on the basis of the count value of the counter 2 and the second judging means 4 is installed. Thus, the smooth operation of an internal- combustion engine is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an internal combustion engine that performs ignition control and fuel injection control based on the rotational angular position of the internal combustion engine.

In order to operate a conventional internal combustion engine smoothly, the rotation angle position of the internal combustion engine is detected, and ignition control and fuel injection control are performed based on the detection results. To detect the rotational angular position of the internal combustion engine, a rank angle sensor is generally used because it has a relatively simple structure.

The crank angle sensor generates rotation angle position signals 01 to C12 as shown in FIGS. 5(A) to 5(C), for example, and 1. It outputs the second top dead center signals Gl and G2, and the rotation angle position signals 01 to C12 indicate that the internal combustion engine (crankshaft) is at a certain angle (
In this case, it is output every time it rotates (30°C^), and the first.
The second top dead center signals Gl and G2 are output alternately at a predetermined position (top dead center in this case) during one revolution of the internal combustion engine.

Conventionally, such a rank angle sensor is used to detect the rotational angular position of an internal combustion engine in the following manner. That is, the count value is incremented by 1 every time the rotation angle position signals C1 to C12 are applied, and when the top dead center signals Gl and G2 are added and the count value is "12", the rotation angle position signals 01 to C12 are When applied, the count value is
A count value is preset to ``1'', and when the count value is ``12'', the first or second top dead center signal G is set.
A determining means is provided for determining which of the signals L and G2 is applied, and the rotational angular position of the internal combustion engine is detected based on the determination result of the determining means and the count value of the counter. For example, when the signals shown in Fig. 5 (A) to (C) are output from the crank angle sensor, the count value of the counter changes in accordance with the rotational angular position of the internal combustion engine as shown in Fig. 5 (D). Therefore, the rotational angular position of the internal combustion engine can be detected based on the count value of the counter.

Then, fuel injection control and ignition control are performed based on the count value of the counter and the judgment result of the judgment means. For example, when controlling the fuel injection of a 6-cylinder internal combustion engine, the first upper limit After detecting the point signal G1, when the count value of the counter reaches "2",
As shown by the solid line in E), the first. After fuel is injected into the fifth cylinder and the first top dead center signal G1 is detected, at the timing when the count value of the counter reaches "10", as shown by the solid line in FIG. After fuel is injected into the 6th cylinder and the second top dead center signal G2 is detected, the count value of the counter is "6".
”, as shown in the same figure (G), the second.
This injects fuel into the fourth cylinder.

Conventionally, the rotation angle position of the internal combustion engine is detected as described above and fuel injection control and two-ignition control are performed, but there are the following problems. In other words, if noise is superimposed on the first or second top dead center signal Gl or G2, the count value of the counter and the rotational angular position of the internal combustion engine will not correspond, and the ignition will start based on the count value of the counter. There is a problem in that the internal combustion engine may not be able to operate smoothly even if the fuel injection control is performed. For example, when noise (A) is superimposed on the top dead center signal G2 as shown in FIG. 1'', and the count value of the counter does not correspond to the rotational angular position of the internal combustion engine until the top dead center signal G2 is applied next.

In order to improve such a drawback, the count value is incremented by 1 every time the rotation angle position signals 01 to C12 shown in FIG. 5(A) are applied, and when the count value is 2, the rotation angle position signal is
When 1 to C12 is applied and the count value is "12"
When the top dead center signals Gl and G2 are applied at the time of .

It has also been proposed in the past to provide a judgment means for judging which of G2 is applied, and to perform ignition control and fuel injection control based on the judgment result of the judgment means and the count value of the counter. There is. With such a configuration, even when noise is superimposed on the first or second top dead center signal Gl or G2, the count value of the counter and the rotational angular position of the internal combustion engine can be made to correspond. be able to. For example, even when noise (A) is superimposed on the second top dead center signal G2 shown in FIG. Since the count value of the counter is not precented to "1" due to (a), the count value of the counter and the rotational angular position of the internal combustion engine correspond to each other.

However, the conventional example described above also has the following problems.

That is, if noise is superimposed on the rotational angular position signals 01 to C12, the count value of the counter and the rotational angular position of the internal combustion engine will semi-permanently not correspond to each other, so ignition control is performed based on the count value of the counter. However, if fuel injection control is performed, there is a problem that the internal combustion engine cannot be operated smoothly. For example, if noise (B) is superimposed on the rotation angle position signals 01 to C12 as shown in FIG. From “6” to “7” as shown in
", and becomes "1" when the rotational angular position signal C12 is added, so the count value of the counter and the rotational angular position of the internal combustion engine are semi-permanently equal to 30.
' There is a problem that the result is shifted by C8. That is, when the top dead center signals Gl and G2 are generated, the count value of the counter is "1" and the top dead center signals Gl and G2 are ignored, so the count value of the counter and the internal combustion engine are There was a problem that the rotation angle position was semi-permanently shifted by 30° CA.

Moreover, the two conventional examples described above also have the following problems. In other words, if the first and second top dead center signals Gl and G2 cannot be detected due to poor contact, etc., and noise is superimposed on the rotational angular position signal, the count value of the counter and the rotational angular position of the internal combustion engine may differ. is the top dead center signal Gl, G again
Therefore, if the ignition control and fuel injection control are performed based on the count value of the counter, the internal combustion engine cannot be operated smoothly.

Problems to be Solved by the Invention The present invention improves the above-mentioned drawbacks, and its purpose is to improve the rotation angle position signal and the first . Even when noise is superimposed on the second top dead center signal, fuel injection control 2 ignition control can be performed at a predetermined timing, and the first. An object of the present invention is to provide a control device for an internal combustion engine that can smoothly operate the internal combustion engine even when both second top dead center signals cannot be detected.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention outputs a rotational angular position signal every time the internal combustion engine rotates by a certain angle, as shown in FIG. The rotation angle sensor 1 alternately outputs first and second reference position signals at a predetermined position during one rotation, and the rotation angle position signals from the rotation angle sensor l are counted. a counter 2 whose count value is set to an initial value when the set value is reached; and a counter 2 whose count value is changed from the first set value to the initial value before the first or second reference position signal is generated. a first determining means 3 for determining whether or not a change has occurred; a second determining means 4 for determining whether the first or second reference position signal is applied from the rotation angle sensor 1; and the counter. detection means 5 for detecting that the first and second reference position signals are no longer applied based on the count value of 2 and the first and second reference position signals from the rotation angle sensor; If the determining means 3 determines that the count value of the counter 2 has not changed from the first set value to the initial value before the first or second reference position signal is generated, the counter The count value of the counter 2 is the first setting value and the first or second reference position signal is generated, the count value of the counter 2 is set as an initial value, and the first determination means 3 If it is determined that the count value of the counter 2 has changed from the first set value to the initial value before the first or second reference position signal is generated, the first or second reference position When the signal is generated, the count value of the counter 2 is set as the initial value, and when the detection means 5 detects that both the first and second reference position signals are not applied, the count value of the counter 2 is set as the initial value. a control means 6 which sets the value as a second set value; and an injection ignition control means 7 which performs fuel injection control and ignition control of the internal combustion engine based on the count value of the counter 2 and the second determination means 4. It was established.

Embodiment FIG. 2 is a block diagram of an embodiment of the present invention, in which 2] is an internal combustion engine, 22 is a crank angle sensor, 2 is a throttle valve, and 24 is a bypass passage that bypasses the downstream and upstream sides of the throttle valve 23. , 25 is an idle speed control valve, 26 is an air amount sensor that detects the amount of intake air, 27 is a temperature sensor that detects the temperature of the intake air, 28 is an opening sensor that detects the opening degree of the throttle valve 230, and 29 is an inside of the intake pipe. 30 is an injector, 3 is a pressure sensor that detects the pressure of
1 is a spark plug, 32 is a Q2 sensor, 33 is a processing unit, 3
4 is an input section, 35 is an AD converter, 36 is an output section, 37 is a memory, and 38 is a microprocessor. Incidentally, the crank angle sensor 22 receives the rotation angle position signals C1 to C12 shown in FIGS. 3(A) to 3(C) and the first . Second top dead center signal G1. G
In this embodiment, the rotational angular position signals 01 to C12 are output every time the internal combustion engine rotates by 30°C, and the 1st and 2nd top dead center signals Gl and G2 are output from the internal combustion engine. The signals are output alternately at the top dead center. Also, the fourth
The figure is a flowchart showing part of the processing contents of the microprocessor 38, and the operation of FIG. 2 will be explained below with reference to the same figure.

The microprocessor 38 performs the processing shown in the flowchart of FIG. 4 every time the rotation angle position signals 01 to C12 are applied from the crank angle sensor 22. It is determined whether or not the count value CNT of a counter (the count value CNT is precented to "0" at the start of operation of the internal combustion engine) is "0". If it is determined that the count value CNT is not "0", that is, if it is determined that the vehicle is in operation, the microprocessor 38 determines whether the flag F1 is "1" (step 52). In addition, the flag F1 is (as mentioned above, the count value CNT of the counter is "12")
If top dead center signals Gl and G2 are not applied at the time of "
1'', and the top dead center signal Gl.

When G2 is applied, it becomes "0". Here, if the top dead center signals Gl and G2 are not applied and the flag F1 becomes "1" when the count value CNT of the counter is "12", noise is superimposed on the rotation angle position signals C1 to C12. For example, the top dead center signals Gl and G2 from the crank angle sensor 22 are no longer applied to the processing unit 33 due to a faulty connection or a contact failure.

Then, if the determination result in step S2 is NO, that is, if the top dead center signals Gl and G2 were applied when the count value CNT of the counter reached "12" last time, the count value CNT of the counter becomes CNT≦ 11 is satisfied or not (step S3), and the result of the determination is YE.
In the case of S, it is determined whether the count value CNT of the counter is "0" (step S7). If the determination result in step S7 is YES, the microprocessor 38 determines whether or not the injection timing has come based on the count value CNT of the counter (step 318).
If the determination result is YES, injection control is performed (step 519); if the determination result is NO, it is determined whether the ignition timing has arrived (step 520); if the determination result is YES, ignition control is performed (step 520); step 521)
If the determination result is NO, the process moves to another control step S22. Further, if the determination result in step S7 is NO, the count value CNT of the counter is incremented by 1 (step S8), and then it is determined whether the count value CNT of the counter satisfies CNT≦12 (step S9). In this case, since the determination result in step S3 is YES, the determination result in step S9 is YES, and the microprocessor 38 performs the process in step 31B.

Further, if the determination result in step S2 is YES and if the determination result in step S3 is NO, the microprocessor 38 determines whether or not the top dead center signal G1 is applied (step S4), and the determination result is NO. In this case, it is determined whether the top dead center signal G2 is applied (step S5).
. If it is determined that the top dead center signal G1 has been applied, the microprocessor 38 sets the flag F1 to "1" (step 515), then sets the flag F2 to "1" (step 516), and then sets the count value of the counter. C.N.T.
is set to "1" (step 517), and then step 31
Move to B. Is the flag F2 the period from the generation of the top dead center signal G1 until the generation of the top dead center signal G2, or the period from the generation of the top dead center signal G2 until the generation of the top dead center signal Gl? The flag F2= r
IJ is the top dead center signal G2 after the top dead center signal G1 is generated.
The flag F2=rOJ corresponds to the period from when the top dead center signal G2 is generated until the top dead center signal G1 is generated. Also, step S
If it is determined in step 5 that the top dead center signal G2 has been applied, the microprocessor 38 sets the flag F1 to "0" (step S6), then sets the flag F2 to "0" (step 514), and then sets the count value of the counter. CNT “1”
Then, step 517) is followed by step 31B.

Further, if the judgment results in steps 34 and 35 are both NO, that is, if the top dead center signals Gl and G2 are not applied, the microprocessor 38 outputs the count value CN of the counter.
It is determined whether T is "0" or not (step S7), and if the determination result is YES, the process moves to step 518, and if the determination result is NO, the count value CNT of the counter is +
Step S8), then the count value CNT becomes CN
It is determined whether T≦12 is satisfied (step S9). If the determination result in step S9 is Y[ES, the microprocessor 38 moves to step 318, and if the determination result is NO, it determines whether the flag F1 is "0" (step 510).

Then, if the judgment result in step S10 is NO, the microprocessor sets the count value CNT to "12" on the third day (step 512), after which the process moves to step knob S18, and if the judgment result is YES, flag F1 is set. is set to "1" (step 513), and then it is determined whether the flag F2 is "0" (step 513), and the determination result is NO.
In this case, after setting the flag F2 to "0" (step 514), the process moves to step S17, and the judgment result is YES.
In this case, after setting the flag F2 to "1" (step 516), the process of step S17 is performed.

As described above, in this embodiment, if the application of the top dead center signals Gl and G2 cannot be detected when the count value CNT of the counter is "12", the flag F1 is set to "1". , when the flag F1 is "1", the top dead center signal Gl is applied every time the rotation angle position signals 01 to C12 are applied.
, G2 is applied or not in step S4. S
5) If it is determined that the top dead center signals Gl and G2 have been applied, the count value CNT of the counter is set to "1" (step 517). When noise (C) and (D) are superimposed on the angular position signal, the flag F1 becomes "1" at the time when the rotational angular position signal C1l is added, as shown in (D) of the same figure.
Since the count value CNT of the counter is set to "1" by the top dead center signal G2 as shown in FIG. 5(E), the count value of the counter is set to "1" as shown in FIG. There is no longer a situation where the rotation angle positions of the CNT and the internal combustion engine are semi-permanently shifted. Furthermore, even when noise (E) is superimposed on the top dead center signal G1 as shown by the dotted line in the same figure (B), when noise occurs, the flag F1 is set to "0", the count value CNT of the counter will not become "1" due to noise (E), and therefore the top dead center signal will not change as in the conventional example shown in FIG. 5 (H). There is no possibility that the count value CNT of the counter and the actual rotational angular position of the internal combustion engine will deviate due to the noise superimposed on Gl and G2. Further, in this embodiment, when the flag F1 is "1" and the counter count value CNT becomes larger than "12", the counter count value CNT is held at "12" (step S9.10.12). ), for example, the same figure (B
), If the top dead center signals Gl and G2, which are marked with symbols (f) and (g) in (C), are missing due to poor contact, etc., the flag F1 will change as shown in (F) in the same figure. ,
Further, the count value CNT of the counter is "12" until the top dead center signals Gl and G2 are applied again, as shown in FIG.
” will be held. That is, 1st. If both the second top dead center signals Gl and G2 are no longer applied due to poor contact, etc., the count value CNT of the counter is "12".
'' and the count value CNT of the counter does not correspond to the fuel injection timing and ignition timing, so fuel injection and ignition are prohibited.

As described in detail, the present invention provides the first or second reference position signal (in the embodiment, the top dead center signal Gl).

If the count value of the counter changes from the first set value (r12J in the embodiment) to the initial value (“1” in the embodiment) before G2) occurs, the first or second set value Since the count value of the counter is set to the initial value when the reference position signal in step 2 is generated, even if noise is superimposed on the rotation angle position signal, there will be no difference between the count value of the counter and the actual rotation angle position. The period in which this occurs can be defined as the period in which the internal combustion engine makes one revolution, and the count value of the force/counter changes from the first set value to the initial value before the first or second reference position signal is generated. If not, the count value of the counter is the first set value, and the count value of the counter is set to the initial value on the condition that the first or second reference position signal is applied. Alternatively, the count value and the actual rotational angular position of the internal combustion engine will not deviate from each other due to noise superimposed on the second reference position signal, and therefore injection control is performed based on the count value.

Ignition control has the advantage that the internal combustion engine can be operated smoothly. In addition, the detection means detects the first and second
When it is detected that both of the reference position signals are no longer applied, the count value of the counter is held at the second set value ("12" in the embodiment).
Injection control and ignition control will not be performed, so even if both the first and second reference position signals are no longer applied due to poor contact, etc., the internal combustion engine will not be able to operate smoothly. There are advantages that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is an explanatory diagram of the operation of Fig. 2, and Fig. 4 shows part of the processing contents of the microprocessor 38. The flowchart shown in FIG. 5 is an explanatory diagram of the operation of the conventional example. 1 is a rotation angle sensor, 2 is a counter, 3 is a first judgment means, 4 is a second judgment means, 5 is a detection means, 6 is a control means,
7 is an injection ignition control means, 21 is an internal combustion engine, 22 is a crank angle sensor, 2 is a throttle valve, 24 is a bypass passage,
δ is an idle speed control valve, 26 is an air amount sensor that detects the amount of intake air, 27 is a temperature sensor, 28 is an opening sensor, 29 is a pressure sensor, 30 is an injector,
31 is a spark plug, 32 is an 02 sensor, 33 is a processing unit,
34 is an input section, 35 is a converter, 36 is an output section, 37
is a memory, and 38 is a microprocessor. Patent applicant Fujitsu Ten Ltd. (1 other person) Representative Patent Attorney Gobe Tamamushi (1 other person) Figure 1

Claims (1)

[Scope of Claims] A rotation angular position signal is output every time the internal combustion engine rotates by a certain angle, and first and second reference position signals are alternately output at a predetermined position during one rotation of the internal combustion engine. a rotation angle sensor that counts rotation angle position signals from the rotation angle sensor, and sets the count value to an initial value when the count value reaches a first set value; and the first or second reference. a first determination means for determining whether the count value of the counter has changed from the first setting value to the initial value before the position signal is generated; and a first or second reference from the rotation angle sensor. a second determining means for determining which of the position signals is applied; and a second determining means for determining which of the position signals is applied;
a detection means for detecting that the reference position signal is no longer applied; and a detection means for detecting that the reference position signal of the counter is no longer applied; If it is determined that the value has not changed to the initial value, the count value of the counter is the first set value, and the first or second reference position signal is generated. The count value of the counter is set as an initial value, and the first determining means determines that the count value of the counter changes from the first set value to the initial value before the first or second reference position signal is generated. If the first or second reference position signal is generated, the count value of the counter is set as an initial value, and the detection means applies both the first and second reference position signals. control means that maintains the count value of the counter at a second set value when it is detected that the count value of the counter is not present; and fuel injection control and ignition control of the internal combustion engine based on the count value of the counter and the second determination means. What is claimed is: 1. A control device for an internal combustion engine, comprising: injection and ignition control means.