JP2001132494A - Intake control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake control device for an internal combustion engine provided with a throttle position sensor 5 which can detect the opening of the throttle valve 2 of a Hail element 31 accurately by adopting such simple constitution that a heat resistant reinforcement plate 36 is integrally arranged to a resin molded part (sensor cover) 7. SOLUTION: By insert-molding a heat resistant reinforcement plate 36 in the main body 51 and installation fix part 52 of a sensor cover 7 resin integrally molded the Hail element 31 and terminals 32, 33 facingly arranged to the inner periphery side of a permanent magnet 6 rotating integrally with the shaft 3 of a throttle valve 2, the effect by the heat of the sensor cover 7 is restrained, even if it is used under a high temperature environment and the opening of the throttle valve 2 of the Hail element 31 can be detected accurately and manufactured inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine for controlling the intake air amount of an internal combustion engine by detecting the opening of a throttle valve housed in a throttle body with high accuracy using a sensor or the like. The present invention relates to an intake control device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, an opening degree of a throttle valve is detected with high accuracy using a throttle position sensor 100 to control an intake air amount of the internal combustion engine. An intake control device has been proposed.
The throttle position sensor 100 includes a contact 104 fixed to a side wall surface of a rotating body 103 that rotates integrally with a shaft 102 of a throttle valve rotatably supported in a valve body 101, and the contact 104.
Cover 1 for fixing the sensor substrate 105 to which the sliding contact is made
06. And the valve body 10
1 and the sensor cover 106, a gasket 107
Is installed. The valve body 101 and the sensor cover 106 are fastened by a clip 108.

[0003]

In recent years, in an intake control device used for an automobile, a throttle position sensor or the like for detecting the opening degree of a throttle valve with higher accuracy than before has been demanded from the viewpoint of control. . In addition, the operating environment conditions of automobiles are very severe in temperature, vibration, etc., and if the sensor cover is composed of a simple resin molded product,
There has been a problem that the sensor output is affected by warpage or distortion of the sensor cover, and the opening of the throttle valve cannot be detected with high accuracy. When manufacturing a sensor cover composed of only a resin molded product, there is a problem that the sensor output is affected by warpage or distortion caused by resin molding, and the opening of the throttle valve cannot be detected with high accuracy.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to detect a throttle valve opening of a detecting element with high accuracy by adopting a simple structure in which a heat-resistant reinforcing member is integrally provided on a resin molded product. It is an object of the present invention to provide an intake control device for an internal combustion engine that can perform the above.

[0005]

According to the first aspect of the present invention, a heat-resistant reinforcing member for reinforcing a resin molded product accommodating a detecting element is provided inside, so that it can be used in a high-temperature environment. Also, since the influence of the heat of the resin molded product can be suppressed, the detection accuracy of the opening degree of the throttle valve of the detection element can be improved. Further, only by providing a heat-resistant reinforcing member for reinforcing the resin molded product, the resin molded product for heat resistance can be manufactured at low cost.

According to the second aspect of the present invention, by providing a heat-resistant reinforcing member for reinforcing the resin molded product accommodating the detection element therein, even when the resin molded product is used in a high temperature environment, the heat of the resin molded product can be improved. Therefore, the positional relationship between the detection element and the magnet does not shift, and the detection accuracy of the opening degree of the throttle valve of the detection element can be improved.

According to the third aspect of the present invention, by adopting a simple structure in which a heat-resistant reinforcing member is integrally provided on the resin molded product, the resin molded product can be used even in a high temperature environment. The influence of the heat of the product can be suppressed. Thus, the opening of the throttle valve can be detected with high accuracy by the detection element fixed to the resin molded product.

According to the fourth aspect of the present invention, the resin molded article is provided with a mounting and fixing portion for mounting an external connection terminal for electrically connecting the detecting element to the outside, and the mounting and fixing portion is provided with a heat-resistant reinforcing member. By integrally disposing them, even when used in a high-temperature environment, it is possible to suppress the influence of the heat of the mounting and fixing portion. Accordingly, the positional relationship between the detection element and the external connection terminal does not shift, and the output of the detection element has no error.

According to the fifth aspect of the present invention, an external connection terminal for electrically connecting the detection element to the outside is integrally provided on the resin molded product, and the external connection terminal is a heat-resistant reinforcing member. , The number of parts can be reduced,
In addition, there is no need to electrically insulate the external connection terminals and the heat-resistant reinforcing member. Further, the thickness of the resin molded product can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Structure of Embodiment] An embodiment of the present invention will be described based on an embodiment with reference to the drawings. here,
FIG. 1 is a diagram showing an overall configuration of an intake control device for an internal combustion engine, and FIG. 2 is a diagram showing a main configuration of a sensor cover.

An intake control apparatus for an internal combustion engine according to the present embodiment includes a throttle body 1 forming an intake passage to an internal combustion engine (engine), and a throttle valve (throttle valve) rotatably supported in the throttle body 1. ) 2, a throttle valve shaft (hereinafter abbreviated as shaft) 3 which is a shaft portion of the throttle valve 2, an actuator 4 for driving the shaft 3 to rotate, and an engine control device (hereinafter referred to as an ECU and an ECU) for electronically controlling the actuator 4. Call).

The intake control device for an internal combustion engine controls the rotational speed of the engine by controlling the amount of intake air flowing into the engine based on the degree of depression of an accelerator pedal (not shown) of the vehicle. . Note that E
The CU is connected to an accelerator opening sensor that converts the degree of depression of the accelerator pedal into an electric signal (accelerator opening signal) and outputs to the ECU how much the accelerator pedal is depressed.

The intake control device for an internal combustion engine converts the opening of the throttle valve 2 into an electric signal (throttle opening signal) and outputs to the ECU how much the throttle valve 2 is open. It has. The throttle body 1 is a device that holds a throttle valve 2. The throttle body 1 is fixed to the intake manifold of the engine using fasteners such as bolts.

The throttle body 1 has a shaft 3
A bearing holder 12 that rotatably supports one end of the shaft 3 via a ball bearing (rolling ball bearing) 11 and a bearing holder that rotatably supports the other end of the shaft 3 via a ball bearing (rolling ball bearing) 13. 14 and a motor housing 15 for housing the motor 9.

The throttle valve 2 corresponds to a rotating body, and is a butterfly type rotary valve for controlling the amount of air taken into the engine, and is fixed to the outer periphery of the shaft 3 using a fastener such as a screw. . The throttle valve 2 of the present embodiment is formed in a substantially disc shape.

The shaft 3 corresponds to a shaft portion of a rotating body. A rotor 17 formed by insert molding of a resin gear 16 is fixed to one end of the shaft 3 by means such as caulking. A coil-shaped return spring 19 is mounted on the outer periphery of the rotor 17 for returning the throttle valve 2 and its shaft 3 to an initial position when the engine is at an idle rotation speed.

The actuator 4 includes a motor 9 that is electronically controlled by the ECU, a pinion gear 20 fixed to the outer periphery of the output shaft of the motor 9, an intermediate reduction gear 21 that rotates while meshing with the pinion gear 20, and an intermediate reduction gear. This is a rotating body driving unit that has the above-described resin gear 16 that rotates in mesh with the gear 21, and that rotates the throttle valve 2 and its shaft 3.

The motor 9 has a motor conduction terminal 22 embedded in the sensor cover 7 and a motor connection terminal 23 integrally connected to the motor conduction terminal 22 and protruding from the sensor cover 7 toward the motor 9. And a drive source that is energized and operated via a motor power supply terminal 24 detachably connected to the motor connection terminal 23. Pinion gear 2
0 rotates integrally with the output shaft.

The intermediate reduction gear 21 is integrally formed of a resin, rotatably fitted on the outer periphery of a fixed shaft 25 forming the center of rotation, and has a large-diameter gear 26 integrally provided on the outer periphery of one end, and other components. It is composed of a small-diameter gear 27 and the like provided integrally on the outer periphery of the end.

The throttle position sensor 5 corresponds to a rotation angle detecting device, and has a cylindrical permanent magnet 6 serving as a magnetic field source and a Hall element integrally disposed on a resin molded product (sensor cover) 7 side. 31, terminals 32 and 33 made of a conductive metal thin plate for electrically connecting the Hall element 31 and an external ECU, and an iron-based metal (magnetic material) that concentrates magnetic flux on the Hall element 31 , And a stator 34.

The permanent magnet 6 is an iron-based metal (magnetic material) that rotates integrally with the throttle valve 2 and its shaft 3.
Is fixed to the inner peripheral surface of the rotor 17 made of
Alternatively, it is a component that is fixed to the resin by integral molding and applies magnetic flux to the magnetic circuit of the throttle position sensor 5.

The permanent magnet 6 of this embodiment has a semi-arc shaped magnet portion whose magnetization direction is radial (N pole on the inner circumference side and S pole on the outer circumference side), and has a magnetized direction in the radial direction (S pole on the inner circumference side). N pole and outer circumference
(Pole) semi-arc shaped magnet portion. The rotor 17 has a positioning hole 18 for mounting the shaft 3 at the idle ring position.

The Hall element 31 is equivalent to the detection element of the present invention, and is disposed to face the inner peripheral side of the permanent magnet 6, and when a magnetic field of N pole or S pole is generated on the sensing surface, the magnetic field is reduced. It is provided so as to generate an electromotive force (a + potential is generated when a magnetic field of the N pole is generated, and a − potential is generated when a magnetic field of the S pole is generated). Terminals 32 and 33
One of the terminals is an input signal terminal, and the other is an output signal terminal.

The Hall element 31 and the terminal 32,
A connection portion with the connection member 33 is covered with a connection holder 35 made of a thermoplastic resin such as PBT. The two divided stators 34 are fitted and fixed to the outer periphery of the connect holder 35, respectively.

The sensor cover 7 closes the opening side of the throttle body 1 and is made of a thermoplastic resin such as PBT which is lightweight, easy to manufacture and inexpensive, and electrically insulates the terminals of the throttle position sensor 5 from each other. Resin molded products are used. The sensor cover 7 has a concave portion 47 fitted to a convex portion 46 provided on the opening side of the throttle body 1, and is assembled to the opening side end of the throttle body 1 by a substantially cylindrical clip 49 by fastening. Have been.

Therefore, by assembling the throttle body 1 and the sensor cover 7 so that the convex portion 46 and the concave portion 47 are fitted, the hall element 31 and the throttle body 1 arranged and fixed on the sensor cover 7 side are attached. Rotor 17 that rotates integrally with shaft 3 that is rotatably supported
Deviation of the positional relationship with the permanent magnet 6 disposed and fixed on the inner circumference of the circumstance can be eliminated.

The sensor cover 7 integrally includes a motor energizing terminal 22, terminals 32 and 33, a stator 34, a connect holder 35 for holding the Hall element 31, and a heat-resistant reinforcing plate 36 (for example, insert molding). Etc.). The heat-resistant reinforcing plate 36 corresponds to the heat-resistant reinforcing member of the present invention, and includes the main body 51 of the sensor cover 7, the motor energizing terminal 22, the terminal 32,
33 is buried in the entire mounting fixing portion 52 buried therein.

The heat-resistant reinforcing plate 36 is an iron-based metal plate having a thickness of, for example, about 1 mm to 10 mm, and has a clearance between the motor energizing terminal 22 and the terminals 32 and 33. In addition, since the resin is present in the clearance, electrical insulation between the motor energizing terminal 22 and the terminals 32 and 33 is provided.

Next, the operation of the intake control system for an internal combustion engine according to this embodiment will be briefly described with reference to FIGS.

When the driver steps on the accelerator pedal, an accelerator opening signal is input to the ECU from the accelerator opening sensor. Then, the motor 9 is energized by the ECU so that the throttle valve 2 has a predetermined opening degree, and the output shaft of the motor 9 rotates. When the output shaft rotates, the pinion gear 20 rotates and torque is transmitted to the large-diameter gear 26 of the intermediate reduction gear 21.

When the small-diameter gear 27 rotates with the rotation of the large-diameter gear 26, the resin gear 16 meshing with the small-diameter gear 27 rotates. As a result, the rotor 17 in which the resin gear 16 is insert-molded rotates, so that the shaft 3 rotates by a predetermined rotation angle, and the throttle valve 2 is formed in the intake passage formed in the throttle body 1 to the engine.
Is maintained at a predetermined rotation angle.

On the other hand, the throttle position sensor 5
The position of the permanent magnet 6 that rotates integrally with the rotor 17 is detected by the Hall element 31, and a throttle opening signal is sent to the ECU via the terminals 32 and 33. The ECU determines how much fuel to inject based on the throttle opening signal.

[Effects of Embodiment] Here, the throttle valve 2
Many intake control devices for internal combustion engines that detect the opening degree of the internal combustion engine with a throttle position sensor 5 include a resin made of a thermoplastic resin such as PBT, which is lightweight, easy to manufacture, inexpensive, and electrically insulable. Uses molded products. In addition, an intake control device for an internal combustion engine used for an automobile has severe usage environment conditions (temperature, vibration, etc.), and may be used in an extremely high temperature environment of 120 ° C. in particular.

For this reason, if the sensor cover 7 is formed of a mere resin molded product, the sensor cover 7 may be warped or distorted when the throttle position sensor 5 is used or manufactured during manufacture.
The positional relationship between the Hall element 31 disposed on the sensor cover 7 side and the permanent magnet 6 is displaced, and the sensor output is affected, so that the opening degree of the throttle valve cannot be detected with high accuracy.

Therefore, in an intake control device for an internal combustion engine which controls the intake air amount of the engine by detecting the opening of the throttle valve 2 with high accuracy using the throttle position sensor 5, a sensor cover (resin molded product) is used. By adopting a simple structure in which a heat-resistant reinforcing plate 36 is integrally provided (for example, insert molding) on 7), the influence of heat of the sensor cover 7 can be suppressed even when used in a high-temperature environment. Thus, the opening degree of the throttle valve 2 of the throttle position sensor 5 can be detected with high accuracy, and the production can be performed at low cost.

[Modification] In this embodiment, an example has been described in which the Hall element 31 is used as a non-contact detection element.
A Hall IC or a magnetoresistive element may be used as the non-contact type detecting element.

In this embodiment, the positional deviation between the permanent magnet 6 fixed to the rotor 17 rotating integrally with the shaft 3 of the throttle valve 2 and the Hall element 31 integrated with the sensor cover 7 is eliminated. However, the relative position between the contact integrated with the throttle valve and the sensor substrate integrated with the sensor cover is shifted, the positional relationship between the detection element such as a magnetic detection element and the magnet, and the contact between the magnet and the sliding resistor. May be eliminated.

In this embodiment, the heat-resistant reinforcing member such as the heat-resistant reinforcing plate 36 is embedded in the entire body 51 and the mounting and fixing portion 52 of the sensor cover 7. The sensor cover 7 may be provided integrally with only the main body 51 of the cover 7, or may be provided integrally with only the mounting and fixing portion 52 of the sensor cover 7.

It is to be noted that a reinforcing plate for heat resistance which is divided into two or more parts may be used. Further, the reinforcing member is desirably a metal having a heat-resistant specification (a material having a small warp or distortion) such as an iron plate. Further, by using a metal plate having high rigidity for electric wiring inserted into a resin molded product such as the sensor cover 7, a reinforcing plate for heat resistance may also serve as electric wiring.

In this embodiment, the present invention is applied to an actuator 4
Has been described in which the present invention is applied to an intake control device for an internal combustion engine in which the throttle valve 2 and its shaft 3 are rotationally driven, but the present invention mechanically controls the depression amount of the accelerator pedal through a wire cable or an accelerator lever. The present invention may be applied to an intake control device for an internal combustion engine in which the throttle valve 2 and its shaft 3 are transmitted to the throttle valve 2 and its shaft 3 for transmission.

In this embodiment, an example in which the cylindrical permanent magnet 6 is employed as the magnetic field generating source has been described. However, a split type permanent magnet may be employed as the magnetic field generating source.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an overall configuration of an intake control device for an internal combustion engine (embodiment).

FIG. 2 is a sectional view showing a main configuration of a sensor cover (Example).

FIG. 3 is a cross-sectional view showing a main configuration of an intake control device for an internal combustion engine (prior art).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle body 2 Throttle valve 3 Shaft (shaft part) 4 Actuator 5 Throttle position sensor 6 Permanent magnet 7 Sensor cover (resin molding) 9 Motor 17 Rotor 31 Hall element (detection element) 32 Terminal (external connection terminal) 33 Terminal ( External connection terminal) 36 Heat-resistant reinforcing plate (heat-resistant reinforcing member) 52 Mounting fixing part

Claims (5)

[Claims] 1. A detection element for detecting an opening degree of a throttle valve, a resin molded product containing the detection element therein, and a heat resistant reinforcement for reinforcing the resin molded product. An intake control device for an internal combustion engine, comprising: 2. A magnet which rotates integrally with a shaft portion of a throttle valve; and b) a magnet which is arranged to face the magnet and detects an opening of the throttle valve by receiving a magnetic force of the magnet. An intake control device for an internal combustion engine, comprising: (c) a resin molded product accommodating the detection device therein; and (d) a heat-resistant reinforcing member for reinforcing the resin molded product. . 3. The intake control device for an internal combustion engine according to claim 1, wherein the detection element is integrally fixed to the resin molded product, and the heat-resistant reinforcing member is integrally formed with the resin molded product. An intake control device for an internal combustion engine, wherein the intake control device is disposed in a vehicle. 4. The intake control device for an internal combustion engine according to claim 1, wherein the resin molded product has an external connection terminal for electrically connecting the detection element to the outside. An intake control device for an internal combustion engine, comprising: an attachment fixing portion, wherein the heat-resistant reinforcing member is integrally provided in the attachment fixing portion. 5. The intake control device for an internal combustion engine according to claim 1, wherein the resin molded article has an external connection terminal for electrically connecting the detection element to the outside. The intake control device for an internal combustion engine, wherein the external connection terminal is provided integrally, and also functions as the heat-resistant reinforcing member.