JP2000162008A - Heating resistance type air flow rate measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the restrictions to the productivity by using a conductive adhesive or heat absorptive resin for the electric contact of an intake temp. sensor with its support member. SOLUTION: An adhesive 103 is used for connection of an intake temp. sensor 100 with an intake temp. sensor support 101. The adhesive 103 has an electric conductivity and is cured by the heat curing, ultrasonic curing or anaerobic curing method. For connection of an intake temp. sensor 100 with an intake temp. sensor support 101, a heat absorptive resin may be used or jointly used. The simultaneous heat curing with an adhesive used for other components can be realized. Thus the time taken for the conventional welding process and facilities depreciation can be reduced to provide a low cost gas flow meter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow rate measuring apparatus for measuring a gas flow rate, and more particularly to a heating resistance type flow rate measuring apparatus suitable for measuring a gas supply amount to an internal combustion engine used in an automobile.

[0002]

2. Description of the Related Art A conventional heating resistance type flow measuring device is disclosed in
As described in Japanese Patent Application Laid-Open No. 8-297040, the connection method between the intake air temperature sensor and the metal member holding the intake air temperature sensor has no structure other than welding.

[0003]

In the above prior art, productivity is limited by adding a welding process for connecting the intake air temperature sensor and a metal member holding the intake air temperature sensor. It is an object of the present invention to eliminate a limitation imposed on productivity by eliminating a welding step by connecting an intake air temperature sensor and a metal member holding the intake air temperature sensor.

[0004]

Means for Solving the Problems A conductive adhesive is used for the electrical connection between the intake air temperature sensor and the intake air temperature sensor, and is thermally cured simultaneously in an adhesive thermal curing step used for another member. Alternatively, a heat-shrinkable resin is used for the electrical connection between the intake air temperature sensor and the intake air temperature sensor, and is simultaneously thermoset in an adhesive thermosetting step used for another member.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 shows an example of a heating resistance type flow meter to which the present invention is applied. The heating resistor 5 and the temperature-sensitive resistor 6 are arranged in the sub-passage 7 through which the gas passes. The heating resistor 5 and the temperature-sensitive resistor 6 are electrically connected to the substrate circuit 8 and the AFS terminal 1, and provide a signal corresponding to the flow rate of the gas passing through the sub-passage 7 to the outside.

An intake air temperature sensor 10 is provided on one side of the sub-passage 7.
0 is arranged, electrically connected to the substrate circuit 8 and the TH terminal 2, and provides a signal corresponding to the intake air temperature to the outside. A
The FS terminal 1 and the TH terminal 2 are held by a housing 3 made of an insulating resin member.
Protected by

As shown in FIGS. 2 and 4, in the prior art, welding is used as a method of connecting the intake air temperature sensor 100 and the conductive intake air temperature sensor support member 101. FIG. 3 shows an embodiment in which an adhesive 103 is used to connect the intake air temperature sensor 100 and the intake air temperature sensor support member 101. The adhesive 103 has conductivity, and the curing method is heat curing,
There are ultraviolet curing and anaerobic curing. As an embodiment of the present invention, a thermosetting type is described for the purpose of simultaneous thermosetting with an adhesive used for another component.

FIG. 5 shows an embodiment in which a heat-shrinkable resin member 104 is used to connect the intake air temperature sensor 100 and the intake air temperature sensor support member 101. The heat-shrinkable resin member 104 has a cylindrical shape, and the electrical connection between the intake air temperature sensor 100 and the intake air temperature sensor support member 101 is made in the manufacturing process.
And can be simultaneously thermoset with the adhesive used for other parts.

FIG. 6 shows an embodiment in which a conductive adhesive 103 and a heat-shrinkable resin member 104 are used in combination for connecting the intake air temperature sensor 100 and the intake air temperature sensor support member 101.

FIGS. 7A, 7B, and 7C show an embodiment in which a positioning groove is provided on the intake air temperature sensor support member 101. FIG. By using this structure, the position of the intake air temperature sensor 100 is stabilized, a highly reliable electrical connection can be made, and the position of the intake air temperature sensor 100 is shifted due to vibration in a process before the intake air temperature sensor 100 is bonded. Is also reduced. Examples of the shape of the groove include a V-shape and an arc shape.

FIG. 8 shows an embodiment used for an internal combustion engine, particularly for a gasoline engine. The intake air 200 to the engine includes an air cleaner 201, an intake air temperature sensor 202, and a body 20.
4, duct 205, throttle angle sensor 206, idle control valve 216, throttle body 20
7 is flowing through an intake passage integrated with the intake manifold 208, the heating resistance type flow measuring device 2 according to the present invention is applied.
03, the flow rate is detected, and the signal in the form of voltage and frequency is taken into the control unit 209, and the injector 210, the tachometer 211, the engine cylinder 2
12, an embodiment used for controlling a combustion unit structure and subsystems including an exhaust manifold 213, a gas 214, and an oxygen concentration meter 215.

FIG. 9 shows an embodiment used for an internal combustion engine, particularly a gas engine. The heating resistance type flow rate measuring device 217 detects the flow rate of the gas supplied from the gas tank 219 via the pressure regulator 218.

[0013]

According to the present invention, the intake air temperature sensor 100
By using a method other than welding to connect the air temperature sensor support member 101 and the air intake temperature sensor support member 101, it is possible to reduce the time spent in the welding process and the depreciation of equipment, and to provide an inexpensive gas flow meter.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flow meter according to an embodiment of the present invention.

FIG. 2 is a side view of an intake air temperature sensor.

FIG. 3 is a side view in which a conductive adhesive is used to connect the intake air temperature sensor and the intake air temperature sensor support member.

FIG. 4 is a plan view of the intake air temperature sensor of FIG. 3;

FIG. 5 is a plan view using a heat-shrinkable resin for connecting the intake air temperature sensor and the intake air temperature sensor support member.

FIG. 6 is a plan view using a conductive adhesive and a heat-shrinkable resin for connecting the intake air temperature sensor and the intake air temperature sensor support member.

FIGS. 7 (A), 7 (B) and 7 (C) are a plan view and a sectional view of FIG. 7 (A) in which a positioning concave portion is provided at a connection portion between the intake air temperature sensor and the intake air temperature sensor support member.

FIG. 8 shows an internal combustion engine (gasoline engine) using the present invention.
FIG.

FIG. 9 is a configuration diagram of a control system of an internal combustion engine (gas engine) using the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... HCW connector, 2 ... TH connector, 3 ... Connector holding member, 4 ... Cover, 5 ... Heating resistor, 6 ... Temperature sensitive resistor, 7
... Auxiliary passage, 8 ... Circuit board, 9 ... O-ring, 100 ... Intake air temperature sensor, 101 ... Intake air temperature sensor support member, 102 ...
Resin, 103: conductive adhesive, 104: heat shrink resin, 2
00: intake air, 201: air cleaner, 202: intake air temperature sensor, 203: heating resistance type flow measuring device, 204
... Body, 205, duct, 206, throttle angle sensor, 207, throttle body, 208, intake manifold, 209, ECU, 210, injector, 21
1 ... tachometer, 212 ... engine cylinder, 213 ...
Exhaust manifold, 214: gas, 215: oxygen concentration meter, 216: idle control valve, 217: heating resistance type flow rate measuring device, 218: pressure regulator, 219: gas tank.

Claims (8)

[Claims] 1. A heating resistor and a temperature sensing resistor disposed in a gas passage of an internal combustion engine used in an automobile, and a signal corresponding to a flow rate of a fluid based on heat dissipation from the heating resistor to the fluid. An electronic circuit for outputting, and a heating resistance type flow rate measuring device having an intake air temperature sensor for detecting an intake temperature of a fluid,
A heating resistance type flow measurement device, wherein the intake air temperature sensor and a metal member holding the intake air temperature sensor are electrically connected by a method other than welding. 2. An exothermic resistance type flow measuring apparatus according to claim 1, wherein the electrical connection method other than welding is a conductive adhesive. 3. An exothermic resistance type flow measuring device according to claim 1, wherein the electrical connection method other than welding is a tightening force by a heat-shrinkable resin. 4. A heating resistance type flow measuring device according to claim 1, wherein the heat-shrinkable resin has a cylindrical shape. 5. An apparatus according to claim 1, wherein the electrical connection method other than welding is a combination of a conductive adhesive and a compressive force of a heat-shrinkable resin. 6. A heating resistance type flow rate measuring apparatus according to claim 1, wherein a guide for positioning the intake air temperature sensor is provided on a metal member holding the intake air temperature sensor. 7. The heating resistance type flow rate measuring device according to claim 6, wherein the guide for positioning the intake air temperature sensor provided on the metal member holding the intake air temperature sensor is a V-shaped groove or an arc-shaped groove. 8. A heating resistor type air flow measuring device according to claim 1, wherein the heating resistor type flow measuring device is used in a control system of an internal combustion engine for controlling an engine. .