JP3166475B2 - Idle position 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 device for detecting an idle position of an internal combustion engine, which detects an idle position of the internal combustion engine when a throttle valve provided in an intake passage is fully closed.

[0002]

2. Description of the Related Art Conventionally, in an electronically controlled internal combustion engine for a vehicle, fuel supply control is performed in accordance with the opening degree of a throttle valve. This control includes the opening degree of a throttle valve and the full closing of a throttle valve. It is necessary to detect the condition. For this reason, a mechanical switch (idle switch) is conventionally attached to the throttle valve, and a case where the throttle valve is fully closed is detected by turning on this switch. A conventional idle switch is usually built in a throttle sensor and is interlocked with a valve shaft of a throttle valve. In accordance with the rotation of the valve shaft of the throttle valve, the position where the idle switch is turned off from on is adjusted so as to be as close as possible to the fully closed state of the throttle valve.

In the idle position detecting device described in Japanese Patent Application Laid-Open No. 4-63925, an arm-shaped stopper attached to a valve shaft of a throttle valve has a housing attached to a throttle body at a fully closed position of the throttle valve. Press and move the push rod inside. The movable contact provided at the end of the push rod and the fixed contact at a position separated from the movable contact come into contact with each other by the movement of the push rod, and the idle position is detected by the contact between the movable contact and the fixed contact. .

[0004]

However, since the conventional idle switch has a screw-fastened structure, a margin for mounting is required, and a deposit is attached to the throttle valve due to long-time use. Since the throttle valve does not close until the fully closed state, the position where the idle switch is turned on from off is determined by the position where the throttle valve is slightly opened (approximately 1.2 ± 0.3 de).
g) had to be adjusted.

In the idle position detection switch proposed in Japanese Patent Application Laid-Open No. 4-63925, since a gap exists between the movable contact and the fixed contact, the throttle valve is slightly opened by a rotation angle corresponding to the gap. The transition from ON to OFF is performed at the position, and at this point, the intake air amount increases more than when the throttle valve is in the fully closed state, and the driving characteristics have deteriorated. Also, Japanese Patent Application Laid-Open No.
The idle position detection switch proposed in Japanese Patent No. 3925 has a problem that the movable contact and the fixed contact are covered with a housing in order to prevent corrosion due to rain or the like, and the switch becomes large. Further, since a push rod, a movable contact, a fixed contact, a spring, and the like must be provided, there is a problem that the number of constituent members is large, and the detection tolerance of the fully closed position is increased due to the tolerance of each component.

Accordingly, the present invention solves the problems of the conventional idle position detection switch, and can achieve a simple and compact device configuration and an idle position of an internal combustion engine capable of accurately detecting the idle position without error. It is an object to provide a detection device.

[0007]

In order to achieve the object of the present onset to achieve the above purpose
Idle position detecting device of a light of the internal combustion engine, in the idle position detecting device for an internal combustion engine throttle valve provided in an intake passage for detecting the idle position of the internal combustion engine to be fully closed, the intake passage, electrically insulated And the upstream intake passage
It is divided into a downstream intake passage and an upstream intake passage.
At the junction of the flow-side intake passage, insulated from both passages
The throttle valve is held and the throttle in the downstream intake passage is
At a position where the throttle valve is fully closed, a conductive first abutting portion that abuts on a downstream outer edge of the throttle valve is provided at an end on the throttle valve side. Slot
At the end on the throttle valve side, the position where the throttle valve is fully closed
A conductive second abutting portion that abuts on an outer peripheral portion on the upstream side of the throttle valve is provided, and the throttle valve has at least a portion that abuts on the first abutting portion and the second abutting portion. There guide
It is composed of conductive members, and these conductive members
Are connected to the first contact portion and the second contact portion, and the first contact portion and the second contact portion are slotted.
The throttle valve is short-circuited by the
Position detecting means for determining that the position is the idle position
Is provided .

[0008]

[0009]

According to an idle position detecting device of the acting present onset light of the internal combustion engine, at a position where the throttle valve is fully closed, it abuts a first abutment edge portion on the downstream side of the conductive throttle valve, The upstream outer edge of the throttle valve is in contact with the conductive second contact portion. The first and second contact portions are electrically insulated, and a portion of the throttle valve that contacts the first and second contact portions is formed of an electrically connected conductive member. Therefore,
When the throttle valve is in the fully closed position, the first
And the second contact portion are short-circuited. By detecting this short-circuit, the idle position is detected.

[0010]

[0011]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a configuration of a first embodiment of an idle position detecting device for an internal combustion engine according to a first embodiment of the present invention. FIG. 1A shows a cross section of an intake passage at a portion where a throttle valve is provided. FIG. 1B is a local sectional view taken along line BB of FIG. 1A. FIG. 2 is an assembled perspective view showing the configuration of the idle position detecting device for the internal combustion engine shown in FIG.

In FIG. 1, reference numeral 1 denotes an intake passage downstream of the throttle valve, and reference numeral 2 denotes an intake passage upstream (upstream of intake air) of the throttle valve (actually, intake passages 1 and 2). Is configured as a throttle body). Reference numeral 3 denotes a throttle valve attached to a junction between the intake passage 1 and the intake passage 2. The intake passages 1 and 2 have a metal cylindrical shape. As shown in FIG. 1 (b), the intake passage 1 has a thickness on the upper half side larger than that on the lower half side. However, the thickness of the intake passage 2 on the upper half side is smaller than the thickness on the lower half side. Also, the intake passage 1,
Flanges 11 and 21 are provided at the joints 2 respectively. In this embodiment, the flanges 11 and 21 are used.
An insulating gasket 4 and a metal throttle valve 3 which is rotated by a valve shaft 5 are sandwiched between the joints of the intake gasket 4 and the outer peripheral portions of the flanges 11 and 21 are fastened by metal clamps 7 to form the intake passages 1 and 2. Are joined.
In this embodiment, an insulating ring 6 is attached to the outer edge of the flange 21 so that the intake passages 1 and 2 are not conducted by the metal clamp 7, and the bearing 9 of the valve shaft 5 of the throttle valve 3 is made of an insulating material. It is made of material.

In a state where the gasket 4 and the throttle valve 3 are sandwiched and the flanges 11 and 21 are fastened using the clamp 7, the outer peripheral portions of the intake passages 1 and 2 are aligned, and the inner peripheral portions of the intake passages 1 and 2 are aligned. , A step portion a and a step portion b are formed due to a difference in wall thickness. The throttle valve 3 comes into contact with these steps a and b in a fully closed state. In this embodiment, the intake passage 1 downstream of the throttle valve is grounded, and the intake passage 2 upstream of the throttle valve is connected to the engine control computer (ECU) by a lead 8.
10 is connected.

FIG. 2 shows metal intake passages 1 and 2 provided with flanges 11 and 21 at the ends, a metal throttle valve 3 rotatable by a valve shaft 5, an insulating gasket 4,
An insulating ring 6 attached to the outer edge of the flange 21;
FIG. 3 is an assembled perspective view showing the shape of an insulating bearing 9. The gasket 4 is divided into two upper and lower parts.
At both ends, bearing portions 41 for rotatably supporting the valve shaft 5 of the throttle valve 3 are provided. Similarly, the insulating ring 6 is also vertically divided into two parts, and a concave portion 61 for receiving the valve shaft 5 of the throttle valve 3 is provided at both ends of each insulating ring 6. An insulating bearing 9 is attached to a portion of the flanges 11 and 21 facing the valve shaft 5 of the throttle valve 3. The insulation may be provided only on the flange 11 side. In FIG. 2, the illustration of the clamp 7 is omitted.

In the idle position detecting device for an internal combustion engine according to the embodiment configured as described above, the intake passage 1 downstream of the throttle valve and the intake passage 2 upstream of the throttle valve are electrically insulated. . However, when the throttle valve 3 is fully closed, a part of the surface on the downstream side of the throttle valve 3 contacts the point a, and a part of the surface on the upstream side of the throttle valve contacts the point b. And the intake passage 2 upstream of the throttle valve conducts. At this time, the engine control computer (E) is connected to a lead wire 8 connected to the intake passage 2 on the upstream side of the throttle valve.
The CU) 10 receives an idle switch signal.

According to this structure, since the throttle valve 3 itself is a switch, no adjustment error occurs when the throttle sensor is assembled to the throttle body, as in an idle switch built in a conventional throttle sensor. Disappears. Further, since a switch portion is not provided outside the intake passages 1 and 2 unlike a conventional idle switch, space efficiency is good.

Furthermore, the intake passage 1 downstream of the throttle valve
There is a step between the intake passage 2 and the upstream side of the throttle valve. Therefore, even if the deposit is sent from the intake passage 1 on the downstream side of the throttle valve due to a blowback or the like, the step a in FIG. The amount deposited near the
The risk of sticking of the throttle valve 3 even after traveling for a long distance is eliminated.

FIG. 3 shows the configuration of a second embodiment of the internal combustion engine idle position detecting device according to the first embodiment of the present invention. FIG. 3 (a) shows the same portion as FIG. 1 (a). FIG. 3B is a cross-sectional view of the intake passage, and FIG. 3B is a perspective view of the intake passage on the downstream side of the throttle valve in FIG.
Since the configuration of the idle position detecting device of the second embodiment is almost the same as that of the idle position detecting device of the first embodiment described with reference to FIGS. 1 and 2, the same components are denoted by the same reference numerals. The description thereof will be omitted, and only different parts will be described in detail.

In the first embodiment, the thicknesses of the intake passages 1 and 2 are different from each other in the vertical direction. In the second embodiment, the thicknesses of the intake passages 1 and 2 are uniform over the entire circumference. . Instead, in this embodiment, at the fully closed position of the throttle valve 3 provided at the junction between the intake passage 1 and the intake passage 2, the protrusion 12 abuts a part of the downstream surface of the throttle valve 3.
Are provided on the inner peripheral surface of the intake passage 1, and a protrusion 22 that contacts a part of the upstream surface of the throttle valve 3 is provided on the inner peripheral surface of the intake passage 2.

In this embodiment, as can be seen from FIG. 3B , the joint surface side of these projections 12 and 22 is the flange 1
The inside of the intake passages 1 and 2 is formed in a curved shape or a tapered shape in which the wall thickness gradually decreases. The idle position detecting device for an internal combustion engine according to the second embodiment has the same effects as the idle position detecting device for an internal combustion engine according to the first embodiment, and the weight of the intake passages 1 and 2 can be reduced.

FIG. 4 shows the configuration of a third embodiment of the idling position detecting device for an internal combustion engine according to the first embodiment of the present invention. FIG. 4 is a sectional view of the intake passage at the same portion as FIG. Is shown. The configuration of the idle position detecting device according to the third embodiment is substantially the same as that of the idle position detecting device according to the first embodiment described with reference to FIGS. The only difference is that the passage 2 is not made of a conductive material such as a metal but made of an insulating material such as a synthetic resin. Therefore, in the third embodiment as well, the first
The same reference numerals are given to the same components as those of the embodiment, and the description thereof will be omitted. Only different portions will be described in detail.

In the third embodiment, as described above, the intake passage 2 is formed of an insulating material such as a synthetic resin in the same shape as the intake passage 2 of the first embodiment. Therefore, the intake passage 2
The insulating ring 6, which was required in the first embodiment, is unnecessary at the outer edge of the first embodiment, and the entire flange 21 can be integrally formed of the same material. In this embodiment, in order to establish electrical continuity with the throttle valve 3 on the intake passage 2 side at the fully closed position of the throttle valve 3, a conductive member such as a metal ring 23 is provided on the joint surface of the flange 21 . It is mounted flush with the joining surface of the flange 21 . In this embodiment, the metal ring 23 is connected to the outside by a pin 24, and the lead wire 8 connected to the ECU 10 is attached to the pin 24. The flange 21
The conductive member attached to the throttle valve 3 may not be formed in a ring shape, and may be provided only at a portion where the throttle valve 3 contacts the upstream surface of the throttle valve 3 when the throttle valve 3 is fully closed.

The idle position detecting device for the internal combustion engine according to the third embodiment has the same effects as the idle position detecting device for the internal combustion engine according to the first embodiment, and the weight of the intake passage 2 can be reduced. In the first to third embodiments described above, the throttle valve 3 is entirely made of metal, including the valve shaft 5, but the throttle valve 3 is a part that contacts the intake passages 1 and 2 when the throttle valve 3 is fully closed. Only the conductive portions need only be made of a conductive material, and it is only necessary that these contacting portions be electrically conductive. FIG. 5 shows an example in which a part of the throttle valve 3 is made of a conductive material in the idling position detecting device for an internal combustion engine according to the first embodiment of the present invention, and FIG. FIG. 5 (b) is a perspective view, and FIG.
FIG. 3 is a perspective view showing a part of the throttle valve 3 shown in FIG.

The throttle valve 3 shown in FIG.
The throttle plate 3 is made of an insulative material, for example, a synthetic resin, and the conductive plate 31 is provided only on the portion where the throttle valve 3 contacts the intake passages 1 and 2 in the fully closed position. It is mounted flush. A plate 31 attached to one surface of the throttle valve 3
Is extended to the back surface position of the plate 31 attached to the other surface, and the plate 31 provided on both surfaces of the throttle valve 3 at the end of the extended plate 31
Are electrically connected by conductive pins 32 and the like.

In the throttle valve 3 of this embodiment, the weight can be reduced as compared with the case where the entire throttle valve is made of metal, and the valve shaft 5 of the throttle valve 3 is made of an insulating material. There is no need to insulate the bearing of the valve shaft 5 provided at the joint between the passages 1 and 2. FIG. 6 shows the configuration of a first embodiment of the idle position detecting device for an internal combustion engine according to the second embodiment of the present invention. FIG. 6 (a) shows the intake air at a portion where a throttle valve 13 is provided. FIG. 6 (b) is a side view including a partial cross section of the passage, and FIG.
It is a perspective view which takes out and shows only 3. FIG. 7 is a sectional view taken along line CC of FIG. 6 (a).

In the idle position detecting device for an internal combustion engine according to the first embodiment of the second embodiment, there is no particular feature in the material forming the throttle valve 13 and the structure of the intake passage 20. In this embodiment, as shown in FIG.
A stopper link 14 is attached to one end of the third valve shaft 15 located outside the intake passage 20. Then, the distal end portion 14 of the stopper link 14
a is bulged, and an adjusting screw 16 is screwed to the tip portion 14a. The adjusting screw 16 is for adjusting the fully closed position of the throttle valve 13, and is also provided in a conventional throttle valve device.

As shown in FIG. 7, a stopper 17 protrudes from the outside of the intake passage 20, and a piezoelectric element 19, which is a pressure-electric conversion element, is provided on the stopper 17 by an insulating holder 18. Is held. Piezoelectric element 19
Is flush with the surface of the stopper 17. The piezoelectric element 19 is provided with an adjusting screw 16 provided at the distal end 14a of the link 14 at the fully closed position of the throttle valve 13.
And a voltage is generated by the contact of the adjusting screw 16. The voltage generated in the piezoelectric element 19 is taken out by the lead wire 8,
It is sent to an ECU (not shown). The connection between the piezoelectric element 19 and the lead wire 8 is protected by a resin mold 25 from leakage.

In the idle position detecting device for an internal combustion engine according to the embodiment configured as described above, when the throttle valve 13 is in the fully closed position, the tip of the adjusting screw 16 reliably contacts the throttle valve fully closed stopper 17. Is adjusted. This adjustment operation itself is the same as that of the conventional throttle valve device. Since the throttle valve 13 is generally urged to return to the fully closed position, the adjusting screw 16 presses the piezoelectric element 19 at a predetermined pressure at the fully closed position of the throttle valve 13, and a voltage is generated at the piezoelectric element 19. This voltage is sent to an engine control ECU (not shown) via a lead wire 8,
Used as an idle-on detection signal.

As described above, in the idle position detecting device for an internal combustion engine according to the second embodiment, the piezoelectric element 19 is connected to the throttle valve 13.
Since the idle position of the internal combustion engine is detected by being pressed at the fully closed position, there is no danger of corrosion due to rain or the like as with electrical contacts, and there is no problem with contact failure due to dust, etc. Since there is no device, the device configuration can be simplified.

FIG. 8 shows the structure of a second embodiment of the idling position detecting device for an internal combustion engine according to the second embodiment of the present invention. FIG. FIG. 8B is a cross-sectional view of the intake passage, and FIG. 8B is a cross-sectional view of a main part of FIG. 8A. In this embodiment, to simplify the description,
The same components as those in the first embodiment of the second embodiment described with reference to FIG.

The embodiment of FIG. 8 differs from the embodiment of FIG. 7 in that the stopper 17 of the throttle valve 13 is provided inside the intake passage 20. Therefore, the intake passage 2
The slide groove 26 is provided in a part of the wall surface of the zero.
A slider 17a provided below the stopper 17 is slidably accommodated in the slide groove 26. The stopper 17 can be moved in the intake passage 20 by sliding the slider 17a in the slider groove 26, and the distance between the stopper 17 and the throttle valve 13 can be freely adjusted. The stopper 17 can be fixed at a desired position in the intake passage 20 by tightening the position adjusting screw 27 attached to the slider 17a from outside the intake passage 20.

The configuration of the stopper 17 in the intake passage 20 is the same as that of the stopper 17 described with reference to FIG. 7, and the stopper 17 holds a piezoelectric element 19 as a pressure-electric conversion element by an insulating holder 18. I have. The pressing surface of the piezoelectric element 19 is flush with the surface of the stopper 17. The piezoelectric element 19 is connected to a pin 28 protruding from one surface of the throttle valve 13 at the fully closed position of the throttle valve 13. A voltage is generated upon contact. The voltage generated in the piezoelectric element 19 is taken out by the lead wire 8 in the same manner as in the first embodiment, and a sealing material 29 such as a rubber bush attached through the wall surface of the intake passage 20.
Through the ECU to an engine control ECU (not shown) to be used as an idle-on detection signal. Also in this case, the connection between the piezoelectric element 19 and the lead wire 8 is protected from electric leakage or the like by the resin mold 25.

The stopper 17 may be inserted into the intake passage 20 through a hole for attaching the sealing material 29. Also,
The stopper 17 may be provided in the intake passage 20 on the downstream side of the throttle valve 13, or may be provided in the intake passage 20 on the upstream side of the throttle valve 13. In the internal-combustion-engine idle-position detecting device of this embodiment, the piezoelectric element 19 is pressed at the fully closed position of the throttle valve 13 to detect the idle position of the internal-combustion engine. There is no problem of poor contact, and the stopper 17 is located in the intake passage 20, which is advantageous in terms of space.

As described above, according to the idling position detecting apparatus for an internal combustion engine of the first embodiment of the present invention, the normally insulated first valve for detecting that the throttle valve is fully closed.
And the second contact portion, and the throttle valve for short-circuiting the first and second contact portions at the idle position are all provided in the intake passage, so that the device configuration is simplified and the device is downsized. Becomes possible.

According to the idle position detecting device for an internal combustion engine of the second embodiment of the present invention, the pressure-electric conversion element is pressed by the pressing member attached to the throttle valve at the position where the throttle valve is fully closed. However, since the idle position is detected by detecting the generated electric signal, unnecessary components are not required, and the apparatus is simplified and the apparatus can be downsized. Further, since the idle position detecting device for the internal combustion engine of the second embodiment has no electrical contact, there is no possibility that the idle position cannot be detected due to poor contact due to the attachment of foreign matter or the like.

[0036]

As described above, according to the idle position detecting device for an internal combustion engine of the present invention, the device structure can be simplified, the size can be reduced, and the idle position can be accurately detected without error. There is.

[Brief description of the drawings]

FIG. 1 shows the configuration of a first embodiment of an idle position detecting device for an internal combustion engine according to a first embodiment of the present invention, in which (a) is a cross-sectional view of an intake passage at a portion where a throttle valve is provided. (B) is a local sectional view taken along line BB of (a).

FIG. 2 is an assembly perspective view showing a configuration of an idle position detection device for an internal combustion engine of FIG. 1;

FIGS. 3A and 3B show a configuration of a second embodiment of the idle position detecting device for the internal combustion engine according to the first embodiment of the present invention, in which FIG. Figure,
(b) is a partially cutaway perspective view of the intake passage on the downstream side of the throttle valve of (a).

FIG. 4 is a sectional view of an intake passage at a portion where a throttle valve is provided, showing a configuration of a third embodiment of the idle position detecting device for the internal combustion engine according to the first embodiment of the present invention.

FIG. 5 (a) is a perspective view showing another configuration of a throttle valve of the idle position detecting device for an internal combustion engine according to the first embodiment of the present invention, and FIG. 5 (b) is one of the throttle valves shown in FIG. It is a perspective view which cuts out and shows a part.

FIG. 6 shows a configuration of a first embodiment of an idle position detecting device for an internal combustion engine according to a second embodiment of the present invention, in which (a) shows a part of an intake passage at a portion where a throttle valve is provided. FIG. 2B is a side view including a cross section, and FIG. 2B is a perspective view showing only the throttle valve of FIG.

FIG. 7 is a sectional view taken along the line CC of FIG. 6 (a).

FIG. 8 shows a configuration of a second embodiment of the internal combustion engine idle position detecting apparatus according to the second embodiment of the present invention, in which (a) is a cross-sectional view of an intake passage at a portion where a throttle valve is provided. (B) is a sectional view of a main part of (a).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake passage downstream of throttle valve 2 ... Intake passage upstream of throttle valve 3, 13 ... Throttle valve 4 ... Insulating gasket 5, 15 ... Valve shaft 6 ... Insulating ring 7 ... Metal clamp 8 ... Lead wire 9 ... Insulating bearing 10 ... ECU 11,21 ... Flange 12,22 ... Protrusion 16 ... Adjustment screw 17 ... Stopper 17a ... Slider 18 ... Insulating holder 19 ... Piezoelectric element 20 ... Intake passage 23 ... Metal ring 24 ... Pin 25 ... Resin mold 26 ... Slide groove 27 ... Position adjusting screw 28 ... Pin 29 ... Seal material 31 ... Conductivity plate 32 ... Pin

Claims (1)

(57) [Claims] An idle position detection device for an internal combustion engine for detecting an idle position of an internal combustion engine in which a throttle valve provided in an intake passage is fully closed, wherein the intake passage is electrically insulated on an upstream side With the intake passage
The downstream intake passage is divided into two sections.
The throttle valve is held in a state insulated from the road
At the end of the downstream side intake passage on the throttle valve side,
At the position where the throttle valve is fully closed, there is provided a conductive first contact portion which is in contact with a downstream outer edge of the throttle valve.
At the end of the upstream intake passage on the throttle valve side,
At a position where the throttle valve is fully closed, a conductive second contact portion is provided which is in contact with an outer peripheral portion on the upstream side of the throttle valve.
The throttle valve is configured such that at least a portion that contacts the first contact portion and the second contact portion is formed of a conductive member.
In both cases, these conductive members are electrically connected, and are connected to the first contact portion and the second contact portion, and the first contact portion and the second contact portion are connected to each other. The throttle valve
Idle position detecting means for determining that the throttle valve is at the idle position when the circuit is short-circuited .
An idle position detecting device for an internal combustion engine, comprising: