JPH09317516A - Mounting device for pressure sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improved position and structure for mounting a pressure sensor for use in engine control so that the pressure sensor may not issue error signals due to the effect of electric field such as foreign radio waves. SOLUTION: This mounting device has a pressure sensor 8 which has a harness protruded from its case 9 and which is mounted to the intake manifold 1 of an engine by a mounting bracket 10, and the pressure sensor is disposed apart from a dashpanel with an optimum distance not less than 150mm. The mounting bracket 10 made of sheet metal is shaped such that can envelopes the pressure sensor 8. The pressure sensor 8 which is apart from a body panel (the dashpanel) and has a periphery covered to be shielded by the mounting bracket 10, therefore, would not issue error signals due to the effect of electric field such as foreign radio waves.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an automobile in which a pressure sensor is used to control an engine.
The present invention relates to a mounting device for a pressure sensor.

[0002]

2. Description of the Related Art An automobile is required to be capable of appropriately responding to various situations during traveling and always traveling efficiently and with high output and excellent fuel efficiency. Therefore, various sensors are provided and the detected value is compared with a preset value, or each system including the engine system and the brake system is controlled according to a predetermined program.

The control of the engine system of each system is also performed from various viewpoints, and many sensors are used for that purpose.
A pressure sensor that detects the intake negative pressure of the engine is one of them. This pressure sensor may emit an erroneous signal due to the influence of the electric field in the environment around the automobile. Therefore, conventionally, the sensor chip portion inside the pressure sensor is shielded so that such a situation does not occur.

A typical mounting location for a pressure sensor is often a portion of the vehicle body panel that defines the engine compartment. Since the pressure detected by the pressure sensor is the intake negative pressure of the engine, a vacuum hose connects between the pressure sensor and the intake system of the engine. This mounting structure attaches the bracket to the body panel with bolts,
The pressure sensor will be attached to this bracket with bolts. And between the pressure sensor and the intake system of the engine,
Connect with a vacuum hose made of flexible material such as rubber.

[0005]

With such a structure, first, the structure for shielding the sensor chip portion inside the pressure sensor becomes complicated. Moreover, since the structure for mounting on the vehicle body panel is complicated, the number of parts is increased, and the number of man-hours for assembling is also increased. Further, the vacuum hose that connects the pressure switch and the intake system of the engine also accumulates fatigue due to vibration, so you will have to use one with sufficient strength that can withstand long-term use, and the weight will increase.
It is also necessary to make the holding metal fittings and the like strong.

The present invention has been made in view of this point, and the problem that the above-mentioned conventional mounting structure has is posed by drastically changing the mounting position of the pressure sensor and also changing the supporting structure thereof. The purpose is to eliminate it in a grudge.

[0007]

As a means for solving the above-mentioned problems, the present invention as set forth in claim 1 is a pressure sensor in which a harness is projected from a case, and an intake of an engine is mounted by a mounting bracket. It is characterized in that it is mounted on a manifold and an appropriate distance is provided between the pressure sensor and the vehicle body panel.

The invention described in claim 2 is characterized in that, in the invention described in claim 1, the mounting bracket is formed of a metal plate, and has a shape enclosing a case of the pressure sensor.

Further, in the invention described in claim 3, in the invention described in claim 1, the harness projecting from the case is projected toward the harness side arranged on the vehicle body. To do.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIG.
FIG. 2 will be described. Reference numeral 1 is an intake manifold, 2 is a branch pipe, 3 is a surge tank provided on the intake side, and 4 is a flange serving as a mounting portion for the engine 5. The flange 4 is provided with a bolt insertion hole 6, which is shown in FIG.
The bolt 7 is inserted into the engine 5 as shown in FIG. In the center of the upper part of the surge tank 3,
The pressure sensor 8 is attached so that the case 9 is covered with a mounting bracket 10. From the pressure sensor 8, a harness 11 for connecting to the control device is extended toward the rear of the vehicle body.

In this embodiment, since the surge tank 3 is provided so as to form a part of the intake manifold 1, the pressure sensor 8 is attached to this, but when the surge tank 3 is not in this position, the intake sensor is installed. It will be attached to an appropriate place on the manifold 1 itself. In FIG. 2, 12 is an air cleaner, 13 is an intake pipe,
Reference numeral 14 denotes a transmission, and in this embodiment, the engine 5 is placed horizontally.

As shown in FIG. 3, the case 9 of the pressure sensor 8 has a substantially rectangular shape, and a female connector 15 is integrally provided at the tip thereof. The male connector 16 is coupled to the connector 15. A harness 11 for guiding an output signal to a control device (not shown) is connected to the connector 16.

As shown in FIGS. 3 and 4, a negative pressure introducing pipe 17 projects downward from the lower portion of the case 9, and a surge tank 3 is provided through an O-ring 18 for sealing.
It is fitted in a hole 19 provided in the. The negative pressure introducing pipe 17 is provided with a hole 17a so that the internal pressure of the surge tank 3, that is, the intake negative pressure is guided to the pressure detecting portion of the pressure sensor 8.

The mounting bracket 10 is made of sheet metal. As shown in FIG. 3, the shape of the pressure sensor 8 is a U-shape with the lower side and the front side opened, and the pressure sensor 8 is enclosed. Both ends of the mounting bracket 10 are outwardly formed to form flange portions. And the hole 2 of this flange
No. 0 (see FIG. 3) is attached to the surge tank 3 of the intake manifold 1 through a bolt 21.

In the state shown in the drawing, a gap is formed between the mounting bracket 10 and the case 9 of the pressure sensor 8. However, the dimension is controlled so that such a gap does not actually occur. Hold the case 9 with. Or insert an appropriate spacer in this gap,
Alternatively, ribs may be projected from the mounting bracket 10 side or the case 9 side to be held. In any case, the pressure sensor 8 is held securely, and the pressure sensor 8 is wrapped so that the shield performance is not impaired.

As shown in FIG. 2, the dash panel 23 of the vehicle body 22 and the pressure sensor 8 are separated by an appropriate distance (150 mm or more is preferable in an actual vehicle). By placing a distance between the pressure sensor 8 and the vehicle body panel (including panels other than the dash panel 23), it is possible to prevent external radio waves and the like received by the vehicle body panel from reaching the pressure sensor 8.

As shown in FIG. 2, a harness 24 is installed on the dash panel 23. As described with reference to FIG. 3, the connector 16 coupled to the connector 15 of the pressure sensor 8 is connected to the harness 11 that guides the output signal to the control device (not shown). The harness 11 is projected toward the harness 24, and is connected through a connector (not shown) as necessary, or is bundled together to face the control device.

In the pressure sensor mounting device thus constructed, the pressure sensor 8 is mounted on the intake manifold 1 and is sufficiently spaced from the vehicle body panel (dash panel 23). , No erroneous signal is generated due to the influence of electric field in the environment around the automobile. Further, the pressure hose 8 which is conventionally indispensable is connected by directly mounting the pressure sensor 8 on the intake manifold 1 (in the embodiment, it is mounted on the part of the surge tank 3 but may be another part). I decided not to do it.

[0019]

Since the present invention is a pressure sensor mounting device having the above-described structure, it is not necessary for the pressure sensor itself to have a shielding property by providing the mounting bracket with a shield function. . Therefore, the structure is simplified, the number of parts is reduced, and the work man-hours for assembling are also reduced. By keeping the pressure sensor away from the vehicle body panel and the shield function of the mounting bracket, malfunctions due to external radio waves can be reliably prevented. By mounting the pressure sensor not on the vehicle body panel but on the intake manifold on the engine side, the vacuum hose, which was indispensable in the past, is no longer necessary, and the measures against its vibration are also unnecessary. As a result, weight reduction and cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a plan view showing the structure of FIG. 1 attached to an engine in an engine room.

FIG. 3 is a perspective view showing a state in which a pressure sensor and a bracket are separated from each other.

4 is a partially omitted cross-sectional view showing a state in which the bracket covers the pressure sensor, taken along the line AA in FIG. 1. FIG.

[Explanation of symbols]

 1 Intake Manifold 3 Surge Tank 5 Engine 8 Pressure Sensor 9 Case 10 Mounting Bracket 11 Harness 23 Dash Panel 24 Harness

Claims (3)

[Claims] 1. A pressure sensor in which a pressure sensor having a harness protruding from a case is attached to an intake manifold of an engine by a mounting bracket, and an appropriate distance is provided between the pressure sensor and a vehicle body panel. Mounting device. 2. The pressure sensor mounting device according to claim 1, wherein the mounting bracket is formed of a metal plate and has a shape that encloses a case of the pressure sensor. 3. The pressure sensor mounting device according to claim 1, wherein the harness projecting from the case is projected toward a harness side arranged on the vehicle body.