JP2019148526A - Pressure sensor fitting structure integrated with intake air temperature sensor inside intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensor mounting structure integrated with an intake air temperature sensor in an intake manifold capable of protecting a sensor from blown back gas or the like while ensuring the temperature sensitivity of the sensor. SOLUTION: In an intake manifold 1 of an internal combustion engine, an intake air temperature sensor integrated pressure sensor 11 is mounted in a wall surface of a surge tank 5 of the intake manifold 1, and a temperature sensitive portion 13 of the intake air temperature sensor integrated pressure sensor 11 is provided. , A recess 15 is provided on the upstream side of the intake air on the inner wall surface of the surge tank 5 which is provided at a position not protruding from the basic inner wall surface P of the surge tank 5 and adjacent to the mounting portion of the pressure sensor 11 integrated with the intake air temperature sensor. It is characterized by being. [Selection diagram] Fig. 2

Description

  The present invention relates to an intake air temperature sensor integrated pressure sensor mounting structure mounted in an intake manifold.

  2. Description of the Related Art Conventionally, a temperature sensor integrated pressure sensor is known that is attached to an intake manifold (intake pipe) of an automobile and measures the pressure and temperature of intake air in the intake manifold. And the sensor with high responsiveness of a temperature detection element and which can be reduced in size is proposed (for example, refer patent document 1).

JP 2008-261796 A

  Such a sensor has a response pipe that introduces a pressure medium such as air into the pressure detection element, and a thin lead wire connected to the temperature detection element provided at the tip of the communication pipe. At the same time, the size is reduced. However, when it is attached to the intake manifold, there is a concern that the sensor may be contaminated by the blow-back gas of the intake air, and there is a risk of malfunction due to the sensor contamination. FIG. 3 is a cross-sectional view schematically showing an example of a pressure sensor mounting structure integrated with an intake air temperature sensor in a conventional intake manifold. In the intake manifold 1, an intake air temperature sensor integrated pressure sensor 11 is attached to the wall surface of the surge tank 5 of the intake manifold 1. At this time, in order to prevent the sensor contamination, as shown in the figure, the temperature sensing portion 13 at the tip of the sensor is moved away from the portion where the main flow of the intake air flows although the temperature sensitivity is not sufficient, such as the back of the wall surface of the intake manifold 1. Design considerations such as placement in the back were necessary.

  The present invention solves the above problems and provides a pressure sensor mounting structure integrated with an intake air temperature sensor in an intake manifold that can protect the sensor from blow-back gas and the like while ensuring the temperature sensitivity of the sensor. The purpose is to do.

To achieve the above object, an intake temperature sensor integrated pressure sensor mounting structure in an intake manifold according to the present invention is an intake manifold of an internal combustion engine, wherein the intake temperature sensor integrated pressure sensor is connected to a wall of a surge tank of the intake manifold. Mounted inside,
The temperature sensing part of the pressure sensor integrated with the intake air temperature sensor is provided at a position that does not protrude from the basic inner wall surface of the surge tank,
The inner wall surface of the surge tank adjacent to the mounting portion of the pressure sensor integrated with the intake air temperature sensor is provided with a recess on the upstream side of the intake air.

  According to the pressure sensor mounting structure integrated with the intake air temperature sensor in the intake manifold of the present invention, it is possible to protect the sensor from blown-back gas or the like while ensuring the temperature sensitivity of the sensor.

  The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

FIG. 1 is a schematic view showing an intake air temperature sensor integrated pressure sensor mounting structure in an intake manifold according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating an attachment portion of the pressure sensor integrated with the intake air temperature sensor according to the first embodiment. Fig.2 (a) is sectional drawing of the AA direction in FIG. FIG.2 (b) is sectional drawing of the BB direction in Fig.2 (a). FIG. 3 is a cross-sectional view schematically showing an example of a pressure sensor mounting structure integrated with an intake air temperature sensor in a conventional intake manifold.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited or limited to the following examples. The drawings referred to below are schematically described, and the ratio of the dimensions of objects drawn in the drawings may be different from the ratio of dimensions of actual objects. The dimensional ratio of the object may be different between the drawings.

(First embodiment)
FIG. 1 is a schematic view showing an intake air temperature sensor integrated pressure sensor mounting structure in an intake manifold according to a first embodiment of the present invention. In the figure, a three-cylinder mode is illustrated, but the present invention is not limited to this.

  The intake manifold 1 of the internal combustion engine is connected to intake branch pipes 3a, 3b, 3c of a plurality of cylinders connected to an engine (not shown). In the present embodiment, the intake branch pipes 3a, 3b, 3c of the cylinders are arranged in parallel, but the present invention is not limited to this. A surge tank 5 is provided upstream of each intake branch pipe 3a, 3b, 3c. The surge tank 5 is provided downstream of the throttle valve 7 and distributes the intake air introduced through the throttle valve 7 (solid arrow in the figure) to a plurality of cylinders.

  An intake air temperature sensor integrated pressure sensor 11 is attached to the wall surface of the surge tank 5 of the intake manifold 1. FIG. 2 is a view showing an attachment portion of the pressure sensor 11 integrated with the intake air temperature sensor according to the present embodiment. Fig.2 (a) is sectional drawing of the AA direction in FIG. FIG.2 (b) is sectional drawing of the BB direction in Fig.2 (a). As shown in FIG. 2, the pressure sensor 11 integrated with the intake air temperature sensor 11 is attached so that the temperature sensing portion 13 does not protrude from the basic inner wall surface P of the surge tank 5. A recess 15 is provided on the inner wall surface of the surge tank 5 adjacent to the attachment portion of the intake temperature sensor integrated pressure sensor 11 on the upstream side of the intake air.

  Here, the basic inner wall surface P of the surge tank 5 is a virtual surface representing the position of the inner wall surface of a portion other than the unevenness provided partially, such as the recess 15. Since the temperature sensing part 13 of the pressure sensor 11 integrated with the intake air temperature sensor is provided at a position that does not protrude from the basic inner wall surface P of the surge tank 5, the sensor can be protected from blown-back gas or the like. And since the recessed part 15 is provided in the intake upstream of the inner wall surface, intake air can be led to the pressure sensor 11 (temperature sensing part 13) integrated with the intake air temperature sensor, and the temperature sensitivity of the intake air temperature of the sensor can be improved. Can be increased. Here, it is desirable from the viewpoint of improving the temperature sensitivity and preventing sensor contamination that the communication passage opening of the sensor is managed so as to be attached in a direction facing the concave direction.

  The recessed part 15 should just be formed indented rather than the basic inner wall surface P of the surge tank 5, may be formed as a recessed part, and may be formed so that it may protrude from an outer wall surface as a rib. When formed as a rib, the surface rigidity of the wall surface of the surge tank 5 increases, so that the wall thickness can be reduced and the weight can be reduced.

  Normally, intake air enters the intake branch pipe 3c, the intake branch pipe 3b, and the intake branch pipe 3a in this order, but by providing a recess 15 on the wall surface of the surge tank 5 in a direction perpendicular to the flow of intake air. , Can disturb the flow of intake air. Therefore, as shown in FIG. 1, when the intake temperature sensor-integrated pressure sensor 11 is provided at a position facing the intake branch pipe 3b, the intake air flow flowing to the downstream side (intake branch pipe 3c side) from the mounting position. Can be reduced. As described above, according to the present invention, it is possible to improve the tendency of intake air to easily flow to the downstream side and improve cylinder distribution (emission improvement). Accordingly, the pressure sensor 11 integrated with the intake air temperature sensor 11 is provided on the wall surface of the surge tank 5 at a position facing the intake port (intake branch pipe) of the cylinder on the upstream side (closer to the throttle valve 7) of the surge tank 5 of the intake manifold 1. It is preferable that it is attached.

  In addition, the rear wall of the recess 15 (on the downstream side of the pressure sensor 11 integrated with the intake air temperature sensor) protrudes inward from the basic inner wall surface of the surge tank 5 (forms a convex portion), and reaches the wake side. It may have a shape that inhibits flow. By doing so, the cylinder distribution can be further improved, and the surface rigidity of the wall surface of the surge tank 5 can be further improved when the convex portion is formed as the rib.

  In the present embodiment, the internal combustion engine has a plurality of cylinders, the surge tank 5 extends in a direction perpendicular to the axis of the intake pipe, and the throttle valve 7 is disposed at the end of the surge tank 5. However, the intake temperature sensor integrated pressure sensor mounting structure of the present invention is not limited to the internal combustion engine having this structure. However, in the case of the internal combustion engine having the above structure, by adopting the intake temperature sensor integrated pressure sensor mounting structure of the present invention, not only the effect of improving the temperature sensitivity of the sensor and the protection of the sensor but also the improvement of the emission, etc. Since an effect can be acquired, it is more preferable.

DESCRIPTION OF SYMBOLS 1 ... Intake manifold 3a, 3b, 3c ... Intake branch pipe 5 ... Surge tank 7 ... Throttle valve 11 ... Intake air temperature sensor integrated pressure sensor 13 ... Temperature sensing part 15 ... Concave part P ... Basic inner wall surface of a surge tank

Claims (1)

In an intake manifold of an internal combustion engine,
A pressure sensor integrated with the intake air temperature sensor is attached to the wall of the surge tank of the intake manifold,
The temperature sensing part of the pressure sensor integrated with the intake air temperature sensor is provided at a position that does not protrude from the basic inner wall surface of the surge tank,
The inner wall surface of the surge tank adjacent to the attachment portion of the pressure sensor integrated with the intake air temperature sensor is provided with a recess on the upstream side of the intake air,
Intake manifold built-in pressure sensor integrated pressure sensor mounting structure.

Images