KR102352220B1 - Sensor for measuring pressure and temperature of intake gas having gas-liquid separator - Google Patents

Abstract

The present invention relates to a new structure of absorbed air pressure and temperature sensor for preventing the decrease in the accuracy in detecting pressure and temperature generated as air and EGR gas including moisture enter an absorbed air pressure and temperature sensor and for preventing the decrease in the performance of a temperature sensor. According to the present invention, the absorbed air pressure and temperature sensor comprises: a temperature sensor (141) placed at a position for coming in contact with absorbed air and gas introduced into an air intake manifold; and a protective cap (150) protecting the temperature sensor (141), and separating droplets from the gas and absorbed air introduced through one or more ventilation holes (151). The protective cap (150) includes a fluid guide (155) placed inside the protective cap (150) for separating droplets from the gas and absorbed air introduced through the ventilation holes (151). The fluid guide is able to allow the gas and absorbed air introduced into the protective cap (150) through the ventilation holes (151) to collide with the fluid guide (155) by the straightforwardness of fluid, change the flow path, and allow the droplets to be separated from the gas and absorbed air by inertia.

Description

Intake air pressure temperature sensor with gas-liquid separation function {Sensor for measuring pressure and temperature of intake gas having gas-liquid separator}

The present invention relates to an intake air pressure temperature sensor for a vehicle, and more particularly, to an intake air pressure temperature sensor having a gas-liquid separation function for separating droplets from intake air and gas.

The intake air pressure temperature sensor is a sensor that is installed in the intake manifold to sense pressure and temperature and transmit a signal to the ECU. The pressure sensor measures the pressure of intake and EGR gas in the intake manifold, and the temperature sensor measures the temperature. When the intake air pressure temperature sensor transmits temperature and pressure to the ECU in the form of a voltage signal, the ECU calculates the amount of air to determine the fuel injection amount, and sends a fuel injection amount signal to the injector to issue an injection command. In order to detect a more rapid temperature change, the temperature sensor of the intake air pressure temperature sensor is directly exposed to the EGR gas containing moisture and the intake air.

1 illustrates a portion of the intake manifold 20 on which the intake air pressure temperature sensor 10 is mounted. The intake air pressure temperature sensor 10 is fastened with a mounting bolt 11 at a position where it can easily come into contact with the intake air 21 and EGR gas 22 flowing into the intake manifold 20 . The intake pressure temperature sensor 10 has a built-in pressure sensor inside the body, and the temperature sensing unit 12 protrudes outward (the temperature sensor is located in the temperature sensing unit 12). On one side of the main body of the intake air pressure temperature sensor 10, there is a wire connection connector 13.

Meanwhile, the temperature sensor of a hybrid electric vehicle (HEV) is exposed to a low temperature and high humidity environment in the intake manifold compared to a general engine vehicle in winter (HEV does not have high heat in the intake manifold due to frequent engine stops, so it is in a low-temperature, high-humidity state Lim). In addition, when the intake air is mixed with EGR gas, the temperature sensor is more easily exposed to the outside air and moisture in the EGR gas. In addition, since moisture does not evaporate in the HEV vehicle, moisture is condensed on the exterior of the temperature sensor, causing a temperature sensor failure.

If this situation continues for a long time, the plastic material of the sensor unit (housing, etc.) absorbs moisture or moisture enters various gaps and moisture enters the inside of the temperature sensor. As a result, a malfunction called 'Ag migration' in the temperature sensor is induced. In order to solve this problem, a droplet separation or gas-liquid separation function is required.

The present invention proposes an intake air pressure temperature sensor having a new structure to prevent a decrease in the accuracy of pressure and temperature sensing and a decrease in the performance of the temperature sensor caused by the intake air and EGR gas containing moisture entering the intake pressure temperature sensor.

In order to solve the above problems, the present invention provides a temperature sensor in a position where it can contact intake air and gas flowing into an intake manifold, and a gas introduced through at least one vent hole formed to protect the temperature sensor, and To provide an intake air pressure temperature sensor including a protective cap that separates droplets from intake air.

Here, the protective cap includes a fluid guide located inside the protective cap in order to separate droplets from the gas and intake air introduced through the ventilation hole. In the fluid guide, the gas and suction air that have entered the protective cap through the ventilation hole collide with the fluid guide by the straightness of the fluid, and the flow path is changed and rotated, and the droplets contained in the gas and the suction air are separated by inertia. make it possible

In addition, the outer wall of the protective cap includes an inclined inner wall such that the inner diameter increases toward the top. The gas and intake air that have entered the protective cap through the ventilation hole are rotated by the fluid guide to separate the droplets and at the same time rise by the pressure difference due to the inclined inner wall to reach the temperature sensor.

The configuration and operation of the present invention will become clearer through specific embodiments described later in conjunction with the drawings.

According to the present invention, since the moisture-removed gas and intake air are transferred to the temperature sensor, the accuracy of pressure and temperature measurement can be achieved, and the failure rate of the temperature sensor is reduced. In addition, the structure in which droplets (moisture) are collected and discharged in the protective cap facilitates water discharge. In addition, the effect of reducing the defects of the intake air pressure temperature sensor in a low-temperature, high-humidity environment such as HEV in winter is excellent.

1 is an exemplary view of a portion of the intake manifold 20 to which the intake pressure temperature sensor 10 is mounted.
2 is an external view of the intake air pressure temperature sensor 100 according to the present invention.
3 is a view of the intake air pressure temperature sensor 100 with the protective cap 150 separated.
4 is an external view of the protective cap 150
5 is a view of the inner bottom of the protective cap 150 as viewed from above.
6 is a longitudinal cross-sectional view of the protective cap 150 coupled to the temperature sensing unit 140

Advantages and features of the present invention, and methods of achieving them, will become apparent with reference to the preferred embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments described below and may be implemented in various other forms. Examples are merely provided to completely disclose the present invention and to completely inform those of ordinary skill in the art to which the present invention belongs, the scope of the invention, the present invention is defined by the claims will be. In addition, the terminology used in this specification is for the description of an embodiment and is not intended to limit the present invention. In this specification, the singular also includes the plural unless otherwise specified. Also, as used herein, the term 'comprise (comprise, comprising, etc.)' refers to the presence or absence of one or more other components, steps, operations, and/or elements other than the stated elements, steps, operations, and/or elements. It is used in a sense not to exclude addition.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the embodiment, if a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 is an external view of the intake air pressure temperature sensor 100 according to the present invention. The main body 110, the coupling part 120, the connector 130, and the temperature sensing part 140 connected thereto are similar to the case of the conventional intake air pressure temperature sensor 10 shown in FIG. In the present invention, the temperature sensor protection cap 150 is attached to the temperature sensing unit 140 . A plurality of ventilation holes 151 are formed in the protective cap 150 so that the moist EGR gas and suction air 160 containing moisture are introduced and discharged into and out of the temperature sensing unit 140 . In the present invention, the protective cap 150 serves to physically protect the temperature sensor 141 and also serves to separate droplets from the inflowing EGR gas and intake air 160 (gas-liquid separation function).

3 shows a state in which the protective cap 150 is separated. It can be seen that the temperature sensor 141 protrudes from the temperature sensing unit 140 . In a low-temperature, high-humidity environment, the moisture absorbed by the plastic is transferred to the epoxy resin of the temperature sensor to prevent failure during long-term exposure. . In this way, in addition to the cylindrical protective cap 150 is mounted and detached to protect the temperature sensor 141 of the temperature sensing unit 140, the protective cap 150 of the present invention includes a gas-liquid separation function.

4, 5, and 6 are detailed configuration views of the protective cap 150 .

Referring to the external view of FIG. 4 , a plurality of ventilation holes 151 are formed on the circumferential surface of the lower portion of the protective cap 150 . From the wet EGR gas and intake air that have entered the lower part of the protective cap 150 through these ventilation holes 151, the EGR gas and The intake air is brought into contact with the temperature sensor 141 through the upper opening 152 so that the temperature sensor 141 can measure the temperature of the EGR gas and the intake air. The separated droplets are discharged to the outlet of the bottom surface of the protective cap 150 . The EGR gas and the intake air may exit again to the outside through the ventilation hole 151 .

5 and 6 show the droplet separation structure provided in the protective cap 150 in detail. FIG. 5 is a view of the inner bottom of the protective cap 150 as viewed from above, and FIG. 6 is a longitudinal cross-sectional view of the protective cap 150 coupled to the temperature sensing unit 140 .

The outer wall of the protective cap 150 forms an inclined inner wall 153 such that the inner diameter increases upward. A plurality of fluid guides 155 are vertically formed with a space inside the inclined inner wall 153 to form a flow path 154 . The fluid guide 155 induces the wet EGR gas and suction air 160 introduced into the vent hole 151 to spirally rotate into the central part of the protective cap 150, and also the wet EGR gas and suction It acts as a cyclin inducer to separate the droplets from the air (160). In addition, a droplet collecting groove 156 is formed in a concave shape on the bottom surface of the protective cap 150 so that the droplets 161 can be collected. An outlet 157 through which the droplets 161 collected in the droplet collecting groove 156 are discharged to the outside is formed in the droplet collecting groove 156 so that the droplets are discharged.

When the piston valve of the engine is opened and the ETC throttle is opened, the EGR gas in the intake manifold and the intake air are mixed and sucked in, and the wet EGR gas and suction that entered the protection cap 150 through the ventilation hole 151 of the protection cap 150 The air 160 hits the fluid guide 155 by the straightness of the fluid to change the flow path and rotate, and at the same time, the droplets 161 included in the EGR gas and the intake air 160 are separated by inertia. The EGR gas and the intake air 162 from which the droplets are separated are rotated by the fluid guide 155 and, at the same time, rise by the pressure difference by the inclined inner wall 153, and reach the temperature sensor 141 in a state in which moisture is removed. The temperature sensor 141 measures the temperature of the EGR gas and the intake air 162 from which moisture has been removed, thereby improving the temperature sensing accuracy and reducing the failure rate of the sensor. The separated droplets 161 are collected in the droplet collecting groove 156 and discharged through the outlet 157 .

In the structure of the present invention, the fluid guide 155 is installed at an angle of about 60° with respect to the outer wall of the protective cap 150, and the EGR gas and intake air 162 entering the protective cap 150 through the ventilation hole 151. ) to reduce the air resistance, and also to form the fluid guide 155 in a shape where the angle is bent in two stages so that the wet EGR gas and intake air 160 are first separated by inertia before the rotational movement. make it possible

As described above, the present invention has the following differences compared to the prior art.

1) The present invention is a gas-liquid separation unit integrated intake pressure temperature sensor,

2) Due to the protective cap that does not directly touch the temperature sensor, even if the plastic material of the sensor unit absorbs moisture, it is not transmitted directly to the temperature sensor.

3) In particular, the temperature sensor protection effect is excellent in the low-temperature, high-humidity environment of a hybrid vehicle (HEV)

Although the present invention has been described in detail through preferred embodiments so far, those of ordinary skill in the art to which the present invention pertains will find that the present invention has a specific form different from the content disclosed in the present specification without changing the technical spirit or essential features It will be understood that it can be implemented as It should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the invention is to be determined by the following claims rather than the above detailed description, and all changes or modifications derived from the claims and their equivalent concepts should be construed as being included in the technical scope of the present invention. .

Claims (8)

a temperature sensor positioned to be in contact with the intake air and gas flowing into the intake manifold; and
At least one vent hole that protects the temperature sensor and is formed in the lower part of the vertically lined tubular, and is installed vertically inside the tubular to separate droplets from the gas and intake air flowing from the lower part through the vent hole. A protective cap including one fluid guide,
In the fluid guide of the protective cap, the gas and suction air entering the protective cap through the ventilation hole collide with the fluid guide by the straightness of the fluid, and the flow path is changed and rotated, and droplets contained in the gas and the suction air Intake air pressure temperature sensor, characterized in that it is separated by inertia.
The intake air pressure temperature sensor according to claim 1, wherein the protective cap is configured to be spaced apart from the temperature sensor in order to protect the temperature sensor.
delete The method according to claim 1, wherein the outer wall of the protective cap includes an inclined inner wall whose inner diameter increases toward the top,
An intake pressure temperature sensor in which gas and intake air that have entered the protective cap through the vent hole are rotated by the fluid guide to separate droplets and at the same time rise by a pressure difference due to the inclined inner wall to reach the temperature sensor.
According to claim 1, wherein the fluid guide is
An intake air pressure temperature sensor installed at an angle of 60° with respect to the outer wall of the protective cap to reduce air resistance of gas and intake air entering the protective cap through the ventilation hole.
According to claim 1, wherein the fluid guide is
The intake pressure temperature sensor is formed in a shape where the angle is bent in two stages so that the droplets are separated by inertia before the gas and intake air rotate.
The method of claim 1, wherein the protective cap is
a droplet collecting groove in which droplets separated from the EGR gas and intake air introduced through the vent hole are collected; and
and an outlet through which the droplets collected in the droplet collecting groove are discharged.
The intake air pressure temperature sensor according to claim 1, wherein the outer wall of the protective cap includes an inclined inner wall whose inner diameter increases toward the top.

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