Waterproof ventilation structure of engine ECU (Electronic Control Unit)

Abstract

The utility model discloses a waterproof ventilation structure of an engine ECU (Electronic Control Unit), which comprises an ECU sealing shell, and a ventilation through hole is formed in a top plate of the ECU sealing shell; a lower seat is mounted in the ventilation through hole, the upper part of the lower seat extends out of the top surface of the ventilation through hole, an upper cover is mounted at the top of the lower seat, and an air inlet gap is formed between the upper cover and the top surface of the lower seat; an upper through hole communicated with an inner cavity of the ECU sealing shell is formed in the middle of the top face of the lower base, a waterproof oleophobic breathable film is fixed to the top face of the lower base, and the upper through hole in the middle of the top face of the lower base is covered with the waterproof oleophobic breathable film. Water, oil and tiny dust can be prevented from entering the ECU shell to corrode and damage a PCB and electronic elements of the ECU, and the service life of the engine ECU is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel engine equipment technical field more specifically, relate to a waterproof breather structure of engine ECU. BACKGROUND

[0002] Non-road engine when working on the plateau, due to low air pressure, air is thin, so it needs to correct and compensate its fuel injection amount, to ensure the normal start and operation of the engine, meet its power, economy and emission requirements. At present, the engine fuel injection correction (ECU control strategy) under the plateau working condition is realized based on the environmental atmospheric pressure.

[0003] T / CICEIA / CAMS28-2021 《Non-road Mobile Machinery Diesel Engine NCD / PCD System Information Definition Technical Specification》 defines the fourth stage data stream information of China non-road and recommended communication protocol parameter identifier, wherein the atmospheric pressure value is a mandatory requirement, which must be sent in real time and accurately through ISO15031 or ISO27145 or SAEJ1939 communication protocol.

[0004] To meet the above requirements, the optimal technical solution is to integrate an atmospheric pressure sensor in the PCB (printed circuit board) of the ECU (engine control unit) to realize the correction of the engine fuel injection amount under the plateau working condition and the real-time and accurate sending of the atmospheric pressure value. In order to perceive and collect the atmospheric pressure in the environment, the atmospheric pressure sensor must be placed in the atmospheric environment and must be in communication with the atmosphere in the environment. It needs to set a ventilation hole on the ECU sealed shell, however, after setting the ventilation hole, water, oil and dust are easy to enter, which affects the normal use of the internal components, therefore, an engine ECU waterproof breather structure is urgently needed to adjust and balance the atmospheric pressure inside the closed ECU shell, prevent water, oil and dust from entering the ECU shell, corrode and damage the PCB board and electronic components of the ECU, and prolong the service life of the engine ECU. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the defects of prior art, and provides a waterproof breather structure of engine ECU, which can prevent water, oil and dust from entering the ECU shell, corrode and damage the PCB board and electronic components of the ECU, and ensure the service life of the engine ECU.

[0006] The utility model solves the technical problem by the following scheme:

[0007] A waterproof breather structure of engine ECU, comprising an ECU sealed shell, a ventilation hole is formed in the top plate of the ECU sealed shell;

[0008] The lower seat is installed in the ventilation through hole, the upper part of the lower seat extends out of the top surface of the ventilation through hole, the top of the lower seat is installed with an upper cover, and a gas inlet gap is formed between the upper cover and the top surface of the lower seat.

[0009] The top surface of the lower seat is formed with an upper through hole communicated with the internal cavity of the ECU sealing shell, and a waterproof and oil-repellent breathable film is fixed on the top surface of the lower seat and covers the upper through hole in the middle part of the top surface of the lower seat.

[0010] The upper cover is located directly above the waterproof and oil-repellent breathable film and covers the waterproof and oil-repellent breathable film.

[0011] The bottom surface of the upper cover is formed with a central groove in the middle part, and an annular clamping groove is formed on the upper inner side wall of the central groove;

[0012] The edge part of the top surface of the lower seat is formed with a plurality of clamping parts, a clamping hook part is formed on the top outer side wall of the clamping part, and the clamping hook part is clamped in the annular clamping groove.

[0013] The edge part of the top surface of the lower seat is formed with six clamping parts, and all the clamping parts are uniformly distributed on the edge part of the top surface of the lower seat with the central vertical axis of the lower seat as the center.

[0014] The top surface of the lower seat at the inner side of all the clamping parts is formed with an annular protruding part, the middle part of the annular protruding part is formed with an upper through hole, the outer side wall of the annular protruding part is a tapered wall surface, the bottom part is a large-diameter part, the top part is a small-diameter part, a plurality of positioning holes are formed on the outer side wall of the annular protruding part, the edge part of the waterproof and oil-repellent breathable film is pressed against the outer side wall of the annular protruding part, the bottom part of the rod part of the plurality of positioning fasteners passes through the corresponding through hole of the edge part of the waterproof and oil-repellent breathable film and is clamped in the corresponding positioning hole, the bottom surface of the top holding part of the positioning fastener is pressed against the top surface of the edge part of the waterproof and oil-repellent breathable film, and the waterproof and oil-repellent breathable film covers the upper through hole.

[0015] The bottom surface of the upper through hole of the lower seat is a spherical surface, the middle part of the bottom surface of the upper through hole of the lower seat is formed with a middle through hole, a cross-shaped supporting part is formed on the bottom surface of the upper through hole, the middle part of the bottom surface of the cross-shaped supporting part is formed with an upwardly extending notch, and the middle through hole is located directly below the notch.

[0016] The middle part of the bottom surface of the lower seat is formed with a downwardly extending ventilation pipe, the middle part vertical through hole of the ventilation pipe is communicated with the middle through hole, the bottom end surface of the ventilation pipe is formed with four downwardly extending elastic clamping pieces, the bottom end of the elastic clamping piece is formed with a clasp part, the lower part of the outer side wall of the clasp part is a tapered wall surface with a small bottom end outer diameter and a large top end outer diameter, a sealing ring is clamped on the outer side wall of the ventilation pipe and all the elastic clamping pieces, the sealing ring is located in the ventilation through hole, the inner side wall of the ventilation through hole is a tapered wall surface with a large upper end diameter and a small lower end diameter, and the outer side wall of the sealing ring is pressed against the inner side wall of the ventilation through hole.

[0017] The buckle portion is below the bottom end of the ventilation through hole and in the ECU sealing shell, and a top surface of the buckle portion is pressed against a bottom surface of a top plate of the ECU sealing shell around the ventilation through hole.

[0018] The utility model discloses the protruding effect is:

[0019] Compared with the prior art, it is reasonable in design, simple in structure, high in reliability and low in cost, and the exchange of the atmosphere in and outside the ECU sealing shell and the adjustment and balance of the atmospheric pressure are well solved, which creates necessary conditions for the ECU integrated atmospheric pressure sensor. At the same time, the appearance of the corrosion and damage of the PCB board and electronic components of the ECU caused by water, oil and dust into the ECU shell is prevented, and the service life of the engine ECU is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the partial structure schematic drawing of the utility model installation in the ECU sealing shell;

[0021] Figure 2 It is the partial sectional view of Figure 1 ;

[0022] Figure 3 It is the partial enlarged view of Figure 2 ;

[0023] Figure 4 It is the structure schematic drawing of the upper cover and lower seat connection of the utility model;

[0024] Figure 5 It is the angle change partial structure schematic drawing of Figure 4 ;

[0025] Figure 6 It is the partial structure schematic drawing of the lower seat of the utility model;

[0026] Figure 7 It is the angle change partial structure schematic drawing of Figure 6 ;

[0027] Figure 8 It is another angle change partial structure schematic drawing of Figure 6 ;

[0028] Figure 9 It is the partial structure schematic drawing of the upper cover;

[0029] Figure 10 It is the angle change partial structure schematic drawing of the upper cover. DETAILED DESCRIPTION

[0030] Embodiment, see as Figures 1 to 10As shown, a waterproof and breathable structure of an engine ECU, comprising an ECU sealing shell 100, a ventilation through hole 101 is formed on the top plate of the ECU sealing shell 100;

[0031] A lower seat 10 is installed in the ventilation through hole 101, the upper part of the lower seat 10 extends out of the top surface of the ventilation through hole 101, an upper cover 20 is installed on the top of the lower seat 10, an air inlet gap is formed between the upper cover 20 and the top surface of the lower seat 10; the upper cover 20 is uniformly distributed with three cut edges in the circumferential direction.

[0032] The middle part of the top surface of the lower seat 10 is formed with an upper through hole communicated with the internal cavity of the ECU sealing shell 100, a waterproof and oil-repellent and breathable film 1 is fixed on the top surface of the lower seat 10, and the waterproof and oil-repellent and breathable film 1 covers the upper through hole in the middle part of the top surface of the lower seat 10.

[0033] The upper cover 20 is directly above and covers the waterproof and oil-repellent and breathable film 1.

[0034] Further, the middle part of the bottom surface of the upper cover 20 is formed with a central groove, an annular clamping groove 21 is formed on the upper inner side wall of the central groove, the lower inner side wall of the central groove is a tapered wall surface, and the inner diameter of the bottom end is larger than that of the upper part;

[0035] The edge part of the top surface of the lower seat 10 is formed with a plurality of clamping parts 11, and the top outer side wall of the clamping part 11 is formed with a clamping hook part 111 clamped in the annular clamping groove 21.

[0036] In this embodiment, the edge part of the top surface of the lower seat 10 is formed with six clamping parts 11, and all the clamping parts 11 are uniformly distributed on the edge part of the top surface of the lower seat 10 with the central vertical axis of the lower seat 10 as the center.

[0037] The edge part of the top surface of the lower seat 10 is a tapered wall surface, and the outer diameter of the top part is smaller than that of the bottom part.

[0038] Further, the top surface of the lower seat 10 at the inner side of all the clamping parts 11 is formed with an annular protruding part 12, the middle part of the annular protruding part 12 is formed with an upper through hole, the outer side wall of the annular protruding part 12 is a tapered wall surface, the bottom part is a large diameter part, and the top part is a small diameter part, a plurality of positioning holes are formed on the outer side wall of the annular protruding part 12, the edge part of the waterproof and oil-repellent and breathable film 1 is pressed against the outer side wall of the annular protruding part 12, the bottom part of the rod part of a plurality of positioning fasteners (not shown in the figure, but not shown in the remaining figures) passes through the corresponding through hole of the edge part of the waterproof and oil-repellent and breathable film 1 and is clamped in the corresponding positioning hole (the positioning fastener of this embodiment can be a metal part), the bottom surface of the top holding part of the positioning fastener is pressed against the top surface of the edge part of the waterproof and oil-repellent and breathable film 1, and the waterproof and oil-repellent and breathable film 1 covers the upper through hole. Figure 3

[0039] ​The bottom surface of the upper through hole of the lower seat 10 is a spherical surface, a middle through hole 13 is formed in the middle of the bottom surface of the upper through hole of the lower seat 10, a cross-shaped support part 14 is formed on the bottom surface of the upper through hole, a downwardly extending notch is formed in the middle of the bottom surface of the cross-shaped support part 14, the middle through hole 13 is directly below the notch, and the notch is communicated with the upper through hole.

[0040] A downwardly extending ventilation pipe 15 is formed in the middle of the bottom surface of the lower seat 10, a vertical through hole in the middle of the ventilation pipe 15 is communicated with the middle through hole 13, four downwardly extending elastic clamping pieces 151 are formed on the bottom end surface of the ventilation pipe 15, there is a spacing between every two adjacent elastic clamping pieces 151, the four elastic clamping pieces 151 are uniformly distributed on the bottom end surface of the ventilation pipe 15 with the central vertical axis of the ventilation pipe 15 as the center, and the four elastic clamping pieces 151 gradually extend outward from top to bottom.

[0041] A buckle part 152 is formed at the bottom end of the elastic clamping piece 151, the lower part of the outer side wall of the buckle part 152 is a tapered wall surface with a small bottom end outer diameter and a large top end outer diameter, a sealing ring 6 is clamped on the outer side wall of the ventilation pipe 15 and all the elastic clamping pieces 151, the sealing ring 6 is in the ventilation through hole 101, the inner side wall of the ventilation through hole 101 is a tapered wall surface with a large upper end diameter and a small lower end diameter, and the outer side wall of the sealing ring 6 is pressed against the inner side wall of the ventilation through hole 101.

[0042] The buckle part 152 is below the bottom end of the ventilation through hole 101 and in the ECU sealing shell 100, and the top surface of the buckle part 152 is pressed against the bottom surface of the top plate of the ECU sealing shell 100 around the ventilation through hole 101.

[0043] The lower seat 10 and the upper cover 20 of the embodiment can be plastic parts.

[0044] In use, the ambient air can enter the air inlet gap formed between the upper cover 20 and the top surface of the lower seat 10, pass through the waterproof and oil-repellent breathable film 1, and then enter the upper through hole of the lower seat 10, then enter the ventilation pipe 15 through the middle through hole 13, and then enter the ECU sealing shell 100, thereby completing the exchange of the atmosphere inside and outside the ECU sealing shell 100, adjusting and balancing the atmospheric pressure, and creating necessary conditions for the ECU integrated atmospheric pressure sensor to sense and collect atmospheric pressure values. At the same time, the waterproof and oil-repellent breathable film 1 prevents water, oil and dust from entering the inside of the ECU sealing shell 100 to corrode and damage the PCB board and electronic components of the ECU, thereby ensuring the service life of the engine ECU.

[0045] The above merely is the preferred implementation manner of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A waterproof and breathable structure for an engine ECU, comprising an ECU sealing housing (100), characterized in that: The top plate of the ECU sealing housing (100) has a vent hole (101) formed thereon; A lower seat (10) is installed in the ventilation hole (101). The upper part of the lower seat (10) extends out of the top surface of the ventilation hole (101). An upper cover (20) is installed on the top of the lower seat (10). An air inlet gap is formed between the upper cover (20) and the top surface of the lower seat (10). The lower seat (10) has an upper through hole formed in the middle of its top surface, which communicates with the internal cavity of the ECU sealing housing (100). A waterproof, oil-repellent and breathable membrane (1) is fixed on the top surface of the lower seat (10), and the waterproof, oil-repellent and breathable membrane (1) covers the upper through hole in the middle of the top surface of the lower seat (10).

2. The waterproof and breathable structure for an engine ECU according to claim 1, characterized in that: The top cover (20) is located directly above and covers the waterproof, oleophobic and breathable membrane (1).

3. The waterproof and breathable structure for an engine ECU according to claim 1, characterized in that: The bottom surface of the upper cover (20) is formed with a central groove, and an annular groove (21) is formed on the upper inner wall of the central groove. The lower inner wall of the central groove is a conical wall, and its bottom inner diameter is larger than its upper inner diameter. The top surface of the lower seat (10) has multiple locking parts (11) formed on its edge. The top outer wall of the locking part (11) has a locking hook (111) formed on it, which is locked in the annular groove (21).

4. The waterproof and breathable structure of an engine ECU according to claim 3, characterized in that: The top surface of the lower seat (10) has a conical wall, and its top outer diameter is smaller than its bottom outer diameter.

5. The waterproof and breathable structure for an engine ECU according to claim 3, characterized in that: The top surface of the lower seat (10) at the inner side of all the locking parts (11) is formed with an annular protrusion (12), the middle part of the annular protrusion (12) is formed with an upper through hole, the outer side wall of the annular protrusion (12) is a conical wall, the bottom of which is a large diameter part and the top of which is a small diameter part.

6. The waterproof and breathable structure of an engine ECU according to claim 3, characterized in that: The bottom surface of the upper through hole of the lower seat (10) is a spherical surface. A central through hole (13) is formed in the middle of the bottom surface of the upper through hole of the lower seat (10). A cross-shaped support part (14) is formed on the bottom surface of the upper through hole. An upwardly extending notch is formed in the middle of the bottom surface of the cross-shaped support part (14). The central through hole (13) is located directly below the notch.

7. The waterproof and breathable structure for an engine ECU according to claim 6, characterized in that: The bottom surface of the lower seat (10) is formed with a downward extending vent pipe (15) in the middle. The vertical through hole in the middle of the vent pipe (15) is connected to the middle through hole (13). The bottom end face of the vent pipe (15) is formed with four downward extending elastic clips (151). The bottom end of the elastic clips (151) is formed with a buckle part (152). The lower part of the outer side wall of the buckle part (152) is a conical wall with a small outer diameter at the bottom and a large outer diameter at the top. The outer side walls of the vent pipe (15) and all the elastic clips (151) are fitted with sealing rings (6). The sealing rings (6) are in the vent hole (101). The inner side wall of the vent hole (101) is a conical wall with a large diameter at the top and a small diameter at the bottom. The outer side wall of the sealing rings (6) is pressed against the inner side wall of the vent hole (101). The latching part (152) is located below the bottom end of the vent hole (101) and in the ECU sealing housing (100). The top surface of the latching part (152) presses against the bottom surface of the top plate of the ECU sealing housing (100) surrounding the vent hole (101).

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