JP3227990B2 - Throttle opening detection device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle opening detecting device for an internal combustion engine, and more particularly to a device suitable for an automobile equipped with an electronically controlled fuel injection device.

[0002]

2. Description of the Related Art Generally, in an automobile equipped with an electronically controlled fuel injection device, when the throttle valve is closed, when the throttle valve is opened by a predetermined amount or more, and when the throttle opening changes every moment, the throttle opening is detected. Then, this is processed by the control device, and various fuel injection controls are performed.

[0003] As a device for detecting the throttle opening or the like, there are, for example, those disclosed in Japanese Utility Model Publication No. 3-50583 and Japanese Patent Application Laid-Open No. 5-52148.

In the former case, the detection is carried out by using a throttle valve switch with six terminals comprising two switches each having three terminals. That is, the first switch unit is configured such that the movable contact that rotates together with the throttle valve slides on a sliding resistor having fixed contacts at both ends, and changes the opening degree of the throttle with one movable contact and two fixed contacts. And three terminals for extracting a potential difference signal that changes between the two terminals. And one of the fixed contacts is a power terminal,
The other is connected to a ground terminal, and the movable contact is connected to a terminal for extracting a potential difference signal.

The second switch section is another movable contact which also rotates together with the throttle valve, and is provided separately with a fixed contact for detecting the position when closing the valve and a fixed contact for detecting the position when closing the valve. And the two fixed contacts are brought into conduction, and the above-mentioned positions at the time of valve closing and valve opening are taken out as ON / OFF signals.
It has terminals. In this case, the two fixed contacts are separate circuits, and the ON / OFF signal is extracted from the two terminals. The movable contact is connected to a ground terminal.

The latter is a throttle opening sensor having a three-terminal structure similar to that of the above-mentioned first switch section, and a predetermined difference between a potential difference from the sensor and a preset valve closing and valve opening position. A throttle opening, a valve closing time, and a valve opening time are detected by using a control device that compares and determines the potential difference.

[0007]

In the prior art described above, the former has a large number of terminals, so that the number of components and the number of connection wirings increase, and there are problems in terms of cost and wiring workability.

In the latter case, since the reference potential difference set for determining whether the valve is closed or opened is actually measured at an early stage, the actual potential difference changes due to aging, contamination, etc. The potential difference may not be the reference,
There is a problem of erroneous determination.

It is therefore an object of the present invention is to avoid the influence of such through time change can you detect a specific opening position <br/> simple and reliable engine throttle opening detection In providing the device.

[0010]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a first signal transmitting means for transmitting a voltage signal corresponding to an opening of a throttle valve, and a voltage signal and a plurality of opening positions of the throttle valve corresponding to the voltage signal. Compare and determine with a plurality of predetermined voltage values,
A throttle opening detection device for an internal combustion engine, comprising: a position determination unit that determines an opening position of the throttle valve.
A second signal transmitting means is provided for transmitting a constant voltage signal sequentially at a plurality of opening positions in conjunction with the first signal transmitting means, and the position discriminating means assists the voltage signal. This is achieved by specifying the degree position and determining the opening position of the throttle valve.

Further, there is provided second signal transmitting means for transmitting different constant voltage signals at a plurality of opening positions in conjunction with the first signal transmitting means, and the position discriminating means detects a difference between the constant voltage signals. This can also be achieved by specifying the opening position of the source of the constant voltage signal and determining the opening position of the throttle valve.

Further, there is provided second signal transmitting means for transmitting a constant voltage signal sequentially at a plurality of opening positions in conjunction with the first signal transmitting means, and the position discriminating means complements the comparison judgment with the constant voltage signal. The opening position of the throttle valve may be determined.

[0013]

[0014] Detection of the throttle opening of such an internal combustion engine
According to the device, when the specific opening position is detected when the valve is closed and when the valve is opened, the specific position is generated in accordance with the opening of the throttle valve.
The determination method according to that voltage signal, originating when the valve is closed and during the valve opening
And the determination method is added with live constant voltage (ON / OFF) signal, by introducing a double determination method, if a shift in the voltage signal occurs due aging, the constant-
Since the pressure signal compensates , erroneous determination is avoided. Ma
In addition, the constant voltage signal is output with a small number of signal terminals.
Can be.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a schematic configuration of a throttle opening detecting device for an internal combustion engine according to an embodiment of the present invention.

The structure is as follows. 1 is an intake air passage of the internal combustion engine, and 2 is a throttle valve. Reference numeral 4 denotes a control device which also performs detection control by the throttle valve switch 3 and fuel injection control.

The inside of the switch is provided with a power supply V
C terminal 15, sliding resistor 11, third fixed contact 18
, A ground terminal 13, a first movable contact 25a, a fourth fixed contact 19 for a potential difference signal, and a T for outputting a potential difference signal.
A first switch unit for detecting a throttle opening, a VB terminal 12 for outputting an ON / OFF signal, a first fixed contact 16 and a second fixed contact 17 for an ON / OFF signal, and a second movable A contact 25b, a third fixed contact 18 for an earth circuit, and an earth terminal 13.
It mainly comprises a second switch unit for detecting when the valve is closed and when the valve is opened. The fixed contact for position detection at the time of valve closing is a first fixed contact 16, and the fixed contact for position detection at the time of valve opening is a second fixed contact 17.

The operation is as follows. First movable contact 25a and second movable contact 2 of throttle valve switch 3
5b is linked with the throttle valve 2 and rotates at the same time. Therefore, the first switch unit and the second switch unit are linked.

The first movable contact 25a slides and rotates while connecting between the sliding resistor 11 and the fourth fixed contact 19.

On the other hand, the second movable contact 25b conducts between the second fixed contact 17 and the third fixed contact 18 at a predetermined rotation position, and connects with the first fixed contact 16 at another predetermined rotation position. Conduction is established between the third fixed contact 18. That is, conduction is established at a predetermined opening position of the throttle valve 2.

In the figure, the first movable contact 25a
When the counterclockwise rotation is performed, the direction of the sliding resistor 11 between the VC terminal 15 and the TPS terminal 14 is increased. Therefore, TPS
The TPS voltage, which is a potential difference signal from the terminal 14, decreases. If it rotates clockwise, the TPS voltage increases. As a result, the throttle opening that changes every moment is determined by the potential difference signal TPS.
It is detected as a change in the increase or decrease of the voltage.

On the other hand, the second fixed contact 17 and the third fixed contact 18 are electrically connected at the illustrated rotational position (opening position) via the second movable contact 25b. When the counterclockwise rotation is performed, the conduction between the second fixed contact 17 and the third fixed contact 18 is cut off. Further rotation causes conduction between the first fixed contact 16 and the third fixed contact 18.

At this time, the throttle valve 2 closes the intake air passage 1. This state is when the valve is closed. When the valve is closed,
Since the conduction between the first fixed contact 16 and the third fixed contact 18 is conducted, the conduction is established between the VB terminal 12 and the ground terminal 13, and an ON signal is taken out. This state is called idle S
It is called W ON state.

Conversely, a state in which the throttle valve 2 rotates clockwise to open the intake air passage 1 at a predetermined opening degree is a valve opening state. At this time, the conduction between the second fixed contact 17 and the third fixed contact 18 is conducted, and similarly, the conduction is established between the VB terminal 12 and the ground terminal 13, and an ON signal is extracted. This state is referred to as a full SW ON state. There is no distinction between the two ON signals in this case, and the output voltage of the VB terminal 12 is a constant voltage. The ON signal and the OFF signal can be reversed.

FIG. 2 is a sectional view showing a main part of a throttle valve switch according to an embodiment of the present invention.

The throttle valve switch 3 includes a housing 21, a shaft 22, a bearing 23, a movable contact base 24, a first movable contact 25a, and a second movable contact 25.
b, the contact board 26, the insulating plate 27, and the terminal group 12,
13, 14, and 15 and a connector terminal 28.

The shaft 22 supported by the bearing 23 fitted in the housing 21 rotates in conjunction with the throttle valve 2. The movable contact base 2 is attached to the shaft 22.
4 is fixed. One end of each of the first movable contact 25a and the second movable contact 25b is fixed to the movable contact base 24, and the other end is a sliding contact having a brush structure, and rotates while being in contact with the contact board 26.

The contact substrate 26 has the sliding resistor 11
And a contact group of a first fixed contact 16, a second fixed contact 17, a third fixed contact 18, and a fourth fixed contact 19. Then, the potential difference signal from the sliding resistor 11 and the ON / OFF signal from each contact are transmitted to the terminal group 12, 13, 14,.
15 to the control device 4 (not shown)
8.

FIG. 3 is a view showing a sliding resistor and a contact group of the contact board shown in FIG. A pattern of a sliding resistor and a group of contacts with which the brush-structured sliding contacts of the first movable contact and the second movable contact come into contact is illustrated.

The contact board 26 is, for example, a flat plate made of a ceramic material. On this contact board 26, the VB terminal 1
2, ground terminal 13, TPS terminal 14, and VC terminal 1
5, a first fixed contact 16, a second fixed contact 17,
The contact group of the third fixed contact 18 and the fourth fixed contact 19, and the wiring group between the terminals and the contacts are printed in an arc shape by using, for example, an aluminum film.

The sliding resistor 11 for replacing the change in the throttle opening with the change in the resistance and taking out the change as a change in the potential difference is also provided on the contact substrate 26 by firing a mixture of, for example, carbon and a synthetic resin. Similarly, the print is formed in an arc shape.

As shown in the figure, the VB terminal 12, the first fixed contact 16, and the second fixed contact 17 are electrically connected to form a first circuit. That is, the fixed contact for position detection at the time of valve closing and the fixed contact for position detection at the time of valve opening are 1
Are connected by one circuit, and the equivalent O
In this structure, the NOFF signal is extracted. In this case, the two ON / OFF signals have the same potential without distinction.

The TPS terminal 14 and the fourth fixed contact 19
And the second circuit are formed. And the VC terminal 15
, Sliding resistor 11, third fixed contact 18, and ground terminal 13
Form a third circuit. The portion between the third fixed contact 18 and the ground terminal 13 of the third circuit is connected to the ground circuit of the first switch for detecting the throttle opening and the second switch for detecting when the valve is closed or opened. With the earth circuit,
It is a shared part.

Also, what is indicated by a dotted line in the drawing is a brush structure sliding contact of the first movable contact 25a and the second movable contact 25b.

In this figure, the second movable contact 25b is connected to the first movable contact 25b.
The circuit and the third circuit are connected. Then, the first fixed contact 16 and the third fixed contact 1 are formed by the second movable contact 25b.
8 are conducted. This state is the idle S
W ON state.

In such a state, if the second movable contact 25b rotates clockwise in this figure, the conduction between the first fixed contact 16 and the third fixed contact 18 is temporarily cut off. The reason is that a portion is provided between the first fixed contact 16 and the second fixed contact 17 so that the second movable contact 25b cannot cross the first circuit and the third circuit.

When the rotation is further performed, the second fixed contact 17 and the third fixed contact 18 are electrically connected to each other. This state is the above-described full SW ON state.

On the other hand, the first movable contact 25a conducts between the second circuit and the third circuit. Then, with the rotation of the first movable contact 25a, the sliding resistor 11 between the VC terminal 15 and the TPS terminal 14 increases and decreases, and a change in the throttle opening is taken out from the TPS terminal 14 as a change in the potential difference.

From the above configuration and operation, a potential difference signal and an ON / OFF signal can be obtained from the four terminals.

FIG. 4 is a diagram showing another conductive state of the movable contact of the throttle valve switch. In the figure, a state is shown in which the first movable contact 25a and the second movable contact 25b are located substantially at the intermediate positions of the switch rotation range.

The first movable contact 25a is located at an intermediate position of the sliding resistor 11, and the TPS voltage from the TPS terminal 14 is
It shows 1/2 VC which is half of the input voltage VC of the VC terminal 15. On the other hand, the second movable contact 25b is located between the first fixed contact 16 and the second fixed contact 17, the VB terminal 12 and the ground terminal 13 are not electrically connected, and the VB terminal 12 is
It is in the FF state.

The following can be said from FIG. (1) The TPS voltage which is a potential difference signal from the sliding resistor 11 is 1 /
If the value is 2VC or an approximate value, the VB terminal 12 is definitely OFF. In other words, (2) when the first fixed contact 16 and the third fixed contact 18 are electrically connected, the VB terminal 12 is in the ON state, and the idle SW when the valve is closed is in the ON state, the TPS voltage <1 / 2VC Relationship is established.

(3) The second fixed contact 17 and the third fixed contact 18 are electrically connected, and the VB terminal 12
If the full SW when the valve is open is ON in the N state, T
The relationship of PS voltage> １ ／ VC is established.

In the contents of (2) and (3), since there is no distinction in the ON state, it is not possible to determine whether the valve is closed or open only by the ON signal from the VB terminal. , Can be determined with the help of the TPS voltage. That is, it is possible to specify which opening position the source of the ON / OFF signal (constant voltage signal) is assisted by the potential difference signal (voltage signal) from the sliding resistor 11.

From this, a double determination method in which the ON / OFF signal of the VB terminal 12 is added to the potential difference signal of the TPS terminal 14 is possible, and this will be described with reference to the following determination flowchart.

FIG. 5 is a diagram showing a flowchart for determining when the valve is closed and when the valve is opened according to the embodiment of the present invention. First
Of the second switch for detecting when the valve is closed and when the valve is open is determined based on the potential difference signal from the sliding resistor of the switch.
It is an example of the flowchart which performs the double determination method which added the determination by an OFF signal.

The control device 4 receives the potential difference signal and the ON / OFF signal from the throttle valve switch 3 and executes an arithmetic processing.

First, in step 1, a judgment calculation is started. In step 2, when the TPS voltage of the TPS terminal 14 is 1
/ 2VC or an approximate value. If NO, proceed to step 3. Then, it is determined whether the TPS voltage at the TPS terminal 14 is equal to or higher than 1/2 VC.

If the TPS voltage is equal to or higher than 1/2 VC, it is determined in next step 4 whether the VB terminal 12 is ON.

If VB is ON in step 4, the process proceeds to step 5, where it is determined that the full SW is ON.
In this case, the condition (3) described above is satisfied. Then, in step 8, the determination calculation ends.

However, if VB is OFF in step 4, the OFF signal of the VB terminal 12 has priority, and the full SW is
The process proceeds to step 8 without determining that the state is the N state, and ends the determination calculation. In this case, the comparison of the potential difference signal is complemented by the presence or absence of the ON / OFF signal.

Returning to step 3, if the TPS voltage is not equal to or higher than 1/2 VC, the process proceeds to step 6. Then, in step 6, it is determined whether the VB terminal 12 is ON.

If VB is ON, step 7
In this case, it is determined that the idle SW is in the ON state. This is because the above condition (2) is satisfied. Then, in step 8, the determination calculation ends.

However, if VB is OFF in step 6, the OFF signal of the VB terminal 12 is given priority and the idle SW
Does not determine that it is ON, proceeds to step 8, and ends the determination calculation. Also in this case, the comparison of the potential difference signal is complemented by the presence or absence of the ON / OFF signal.

The above-described determination operation is an embodiment of the double determination method using the potential difference signal at the TPS terminal 14 and the ON / OFF signal at the VB terminal 12, whereby the idle S
Detection of valve closing when W is ON and valve opening when full SW is ON is reliably performed.

On the other hand, returning to step 2, if the TPS voltage is 1 / 2VC or an approximate value, the process proceeds to step 9. Then, it is determined whether the VB terminal 12 is ON. Normally, from the condition (1), VB is definitely OF
Since it is in the F state, the process proceeds to step 8 and the determination calculation ends.

However, if it is ON, step 1
Proceed to 0 to notify that the switch is abnormal. That is, a malfunction of the throttle valve switch 3 can be checked by this determination calculation.

The determination result of the ON state of the full SW and the idle SW is separately used for fuel injection control.

In the embodiments shown in FIGS. 4 and 5, the judgment value has been described as 1/2 VC for easy understanding.
In general, it looks like this:

Returning to FIG. 1, when the second movable contact 25b rotates, there are two positions where the VB terminal 12 changes from the ON state to the OFF state. That is, full SW is O
The position where the state changes to the FF state and the position where the idle SW changes to the OFF state. The TPS voltage at this time is represented by X
And the latter is Y.

Therefore, the ON state of the full SW is TPS voltage ≧ X, and the ON state of the idle SW is TPS voltage ≦ Y
Can be represented by This is a general determination value, and in the related art, these X and Y are given and used as a reference potential difference.

However, as described above, the resistance value of the sliding resistor 11 may change due to aging or contamination, and the reference potential difference may not be the reference. is there.

A method of giving a small margin to the reference potential difference X and Y is also employed. However, if the margin is too small, the change in the resistance value is large and useless. There was also a problem that it would be a true misjudgment.

Therefore, the TPS in which both SWs are in the OFF state
Since the voltage range is X ≧ TPS ≧ Y, the present invention utilizes this. In this case, the TPS voltages corresponding to the two intermediate positions are (X + Y) / 2. This value is used as a determination value in the determination flowchart of FIG.

In this way, a maximum and sufficient margin can be obtained, and the problem of erroneous determination is eliminated. Here, there is one feature of the present invention.

Note that TPS voltage = (X + Y) / 2
There is no need to stick to the middle position. For example, generally, the idle SW is activated more frequently than the full SW is activated.
Therefore, since the change in the resistance value due to the change over time is biased toward the idle SW side, it is desirable to set the determination value with a large margin on the idle SW side.

After all, the judgment value is generally set as follows. The margin of the full-SW side and idle SW side, respectively, and M _X and M _Y. Setting reference potential full SW side, A = _X-M X, and the idle SW side, B = Y +
M _Y.

Then, in the determination flowchart of FIG. 5, the determination expression of step 2 is A ≧ TPS ≧ B, and the determination expression of step 3 is TPS> A.

For example, if there are three ON / OFF signals, there are three set reference potential differences. These are L, M,
Assuming that N, a determination formula such as L ≧ TPS1 ≧ M and M ≧ TPS2 ≧ N is obtained. In any case, it is a determination that specifies the opening position where the ON / OFF signal is transmitted.

Although not shown, the combination of the full SW and the idle SW, the potential difference signal, and the ON / OFF signal may be reversed. In this case, the determinations in step 3, step 5, and step 7 in the above flowchart are reversed. And Further, ≧ and> are not limited to these.

As described above, the resistance value of the sliding resistor 11 changes due to aging or contamination, the reference potential difference and the actual potential difference deviate, and the potential difference signal at the TPS terminal 14 indicates that the valve is closed (or opened). ON)
Check complement can be performed with the FF signal. Therefore,
Detection at the time of valve closing and valve opening is properly performed, and reliability is improved.

On the other hand, when both SWs are OFF, X ≧ TPS
≧ Y 2. In this range, the second movable contact 25
It can be said that b is always in the OFF state.

Therefore, if the TPS voltage is X ≧ TPS ≧ Y
If the VB terminal 12 is determined to be in the ON state in spite of being within the range, the ON / OFF signal can be determined to be erroneous due to some trouble in the throttle valve switch 3.

That is, the above-described contents mean that the transmission of the ON / OFF signal is checked for normality by the potential difference signal, and the failure of the throttle valve switch 3 is diagnosed. Therefore, the reliability of the throttle valve switch 3 for extracting ON / OFF signals when the valve is closed and when the valve is opened can be improved. Note that A and B may be used instead of X and Y.

FIG. 6 is a diagram showing a flowchart for judging when the valve is closed and when the valve is opened according to another embodiment of the present invention. The ON / OFF signal has priority over the comparison judgment based on the potential difference signal,
The position at the time of valve closing or valve opening is determined.

At step 1, the judgment calculation is started. In step 2, it is determined whether the VB terminal 12 is ON. O
If it is not N, the process jumps to step 6 and the determination calculation ends.

ON / OFF based on the comparison judgment based on the potential difference signal
The signal is checked first to simplify the operation of the control device 4.

If it is ON, in step 3, the TPS terminal 1
It is determined whether the TPS voltage, which is the potential difference of No. 4, is equal to or greater than 1/2 VC.

If TPS> １ ／ VC, step 4
Proceed to. Here, the full SW is determined to be in the ON state. If it is determined in step 3 that TPS> １ ／ VC, the process proceeds to step 5. Then, it is determined that the idle SW is in the ON state. Then, in step 6, the determination calculation ends.

FIG. 7 is a diagram showing a throttle valve switch according to another embodiment of the present invention.

A resistor 29 is provided between the first fixed contact 16 and the second fixed contact 17. With such a configuration, the first fixed contact 16 and the third fixed contact 18 are
In the case where the contact is made conductive by the movable contact 25b and in the case where the second fixed contact 17 and the third fixed contact 18 are made conductive,
The output voltage from the VB terminal 12 becomes a different constant voltage.

It is also possible to detect the difference in the constant voltage, specify the opening position outputting a different VB voltage, and determine the position when the valve is closed or opened. The determination flowchart at this time is different from those in FIGS. That is, the step of determining the potential difference signal becomes unnecessary. Since the flowchart can be easily created, the description is omitted.

[0084]

According to the present invention, when the valve is closed and when the valve is opened,
When detecting a specific opening position, the opening of the throttle valve
To determine the opening position by the voltage signal generated in response to
By constant voltage (ON / OFF) signal at valve opening and valve opening
With the addition of the judgment method, the system is configured to make a double judgment.
The voltage signal is shifted due to aging, etc.
In this case, it is compensated by the detection using the constant voltage signal.
Reliable throttle opening detection with reduced misjudgment
A device is obtained. The constant voltage signal has a small signal.
Output with the number of signal terminals.
Can be.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of a throttle opening detection device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a diagram showing a cross section of a main part of a throttle valve switch of one embodiment according to the present invention.

FIG. 3 is a view showing a sliding resistor and a contact group of the contact board shown in FIG. 2;

FIG. 4 is a diagram showing another connection state of the movable contact of the throttle valve switch.

FIG. 5 is a diagram showing a flowchart for determining when a valve is closed and when the valve is opened according to an embodiment of the present invention.

FIG. 6 is a diagram showing a flowchart for determining when a valve is closed and when the valve is opened according to another embodiment of the present invention.

FIG. 7 is a view showing a throttle valve switch of another embodiment according to the present invention.

[Explanation of symbols]

1. 1. intake air passage; 2. throttle valve, 3. Throttle valve switch, Control device, 11. 11. sliding resistor; VB terminal, 13. Ground terminal, 14. TPS
Terminal, 15. VC terminal, 16. First fixed contact, 17. Second fixed contact 18. Third fixed contact, 19. Fourth fixed contact, 21. Housing, 22. Shaft 23. Bearings, 24. Movable contact base, 25a. A first movable contact, 25b. Second movable contact, 26. Contact board, 27.
Insulating plate, 28. Connector terminal, 29. Resistor.

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02D 45/00 364 F02D 9/00 F02D 35/00 364

Claims (6)

(57) [Claims] 1. A first signal transmitting means for transmitting a voltage signal corresponding to an opening of a throttle valve, and comparing and judging the voltage signal with a plurality of predetermined voltage values corresponding to a plurality of opening positions of the throttle valve. And a position determining means for determining the opening position of the throttle valve. A throttle opening detecting device for an internal combustion engine, wherein the constant voltage signal is sequentially output at the plurality of opening positions in conjunction with the first signal transmitting means. The position discriminating means identifies the opening position from which the constant voltage signal is transmitted by using the voltage signal as an assist, and the opening position of the throttle valve. And a throttle opening detecting device for an internal combustion engine. 2. A first signal transmitting means for transmitting a voltage signal corresponding to an opening of a throttle valve, and comparing and judging the voltage signal with a plurality of predetermined voltage values corresponding to a plurality of opening positions of the throttle valve. A throttle position detector for the internal combustion engine, comprising: a position determining means for determining the opening position of the throttle valve. A second signal transmitting unit that transmits a voltage signal, wherein the position determining unit detects a difference between the constant voltage signals,
A throttle opening detection device for an internal combustion engine, wherein the opening position of the source of the constant voltage signal is specified, and the opening position of the throttle valve is determined. 3. A first signal transmitting means for transmitting a voltage signal corresponding to the opening of the throttle valve, and comparing and judging the voltage signal with a plurality of predetermined voltage values corresponding to a plurality of opening positions of the throttle valve. And a position determining means for determining the opening position of the throttle valve. A throttle opening detecting device for an internal combustion engine, wherein the constant voltage signal is sequentially output at the plurality of opening positions in conjunction with the first signal transmitting means. The position determination means complements the comparison determination with the presence or absence of the constant voltage signal to determine the opening position of the throttle valve. Throttle opening detector. 4. The apparatus according to claim 3, wherein said position determining means comprises:
A throttle opening detection device for an internal combustion engine, wherein the transmission of the constant voltage signal is checked by the voltage signal, and the second signal transmission means is diagnosed for failure. 5. A first signal transmitting means for transmitting an opening signal corresponding to an opening of a throttle valve, and comparing the opening signal with a plurality of predetermined values corresponding to a plurality of opening positions of the throttle valve. A throttle discriminating device for an internal combustion engine, comprising: a discriminating means for discriminating and discriminating the opening position of the throttle valve, wherein the position signal is sequentially transmitted at the plurality of opening positions in conjunction with the first signal transmitting means. A second signal transmitting means for transmitting the position signal, the position discriminating means assists the opening signal, determines at which opening position the position signal is transmitted and the position signal, and determines the position of the throttle valve. A throttle opening detection device for an internal combustion engine, wherein the opening position is determined. 6. A first signal transmitting means for transmitting an opening signal corresponding to an opening of a throttle valve, and comparing the opening signal with a plurality of predetermined values corresponding to a plurality of opening positions of the throttle valve. A throttle discriminating device for an internal combustion engine, comprising: a discriminating means for discriminating and discriminating the opening position of the throttle valve, wherein the position signal is sequentially transmitted at the plurality of opening positions in conjunction with the first signal transmitting means. Wherein the position discriminating unit discriminates the opening position of the throttle valve by giving priority to the presence or absence of the position signal over the comparison of the opening signal. A throttle opening detection device for an internal combustion engine.