JP6922384B2 - Control unit cover structure - Google Patents

Description

The present invention relates to a cover structure of a control unit, and more particularly to a cover structure of a control unit attached to a vehicle so as to be exposed to the outside.

A control unit is attached to a vehicle having a frame structure such as a truck so as to be exposed to the outside. For example, a truck equipped with an exhaust gas purification system that purifies NOx (nitrogen oxides) in the exhaust gas using urea water uses a control unit to control the injection amount of urea water to be injected into the exhaust gas. A DCU (Dosing Control Unit) is installed for this purpose.

The above control unit has a housing that houses a control board inside. The housing is provided with an intake hole for adjusting the pressure inside the housing. Further, a packing member is provided in the intake hole, and while air passes through the intake hole, foreign matter (for example, water) is prevented from entering.

Japanese Unexamined Patent Publication No. 2012-246825

By the way, when the vehicle is washed with high pressure, water may pass through the intake hole and enter the inside of the control unit. Then, if water enters the inside of the control unit, the circuit of the control board may not operate properly.

Therefore, the present invention has been made in view of these points, and an object of the present invention is to prevent water from entering the inside of the control unit during high-pressure car washing.

In one aspect of the present invention, a control unit having a housing containing a control board, a bracket for fixing the control unit to a vehicle so that the control unit is exposed to the outside, and the housing. The cover member includes an intake hole provided on the main surface and a cover member provided so as to face the main surface at a predetermined distance from the main surface, and the cover member has a flat plate shape facing the main surface. Provided is a cover structure of a control unit having a facing portion thereof and a side wall portion protruding from the facing portion toward the main surface side and closing a gap between the main surface and the facing portion.
According to the cover structure of the control unit described above, the side wall portion functions as a wall that blocks the intrusion of foreign matter from the gap between the facing portion and the main surface, so that the facing portion and the main surface can be used during high-pressure car washing. It is possible to prevent water from flowing toward the intake hole through the gap between them. As a result, even if the performance of the packing member of the intake hole is low, it is possible to prevent water from entering the inside of the control unit 60 during high-pressure car washing.

Further, the facing portion may have a rectangular shape, and the side wall portion may be bent from each of the three sides of the facing portion.

Further, the cover structure may be provided in the control unit, further provided with a connector mounting portion to which the connector is detachably mounted, and the facing portion may face the connector mounting portion.

The side wall portion may be adjacent to the connector mounted on the connector mounting portion.

According to the present invention, it is possible to prevent water from entering the inside of the control unit during high-pressure car washing.

It is a schematic diagram for demonstrating an example of the structure of the vehicle 1 which concerns on one Embodiment of this invention. It is a schematic diagram for demonstrating an example of the structure of the control unit 60. It is a schematic diagram which shows the control unit 60 seen from the direction A of FIG. It is a schematic diagram which shows the state which removed the waterproof cover 72 from the control unit 60 of FIG.

An outline of the configuration of the vehicle 1 according to the embodiment of the present invention will be described with reference to FIG.

FIG. 1 is a schematic diagram for explaining an example of the configuration of the vehicle 1 according to the embodiment. The vehicle 1 is a vehicle having a frame structure, and is, for example, a truck. As shown in FIG. 1, the vehicle 1 includes a vehicle body frame 10, a cab 20, a fuel tank 30, a urea water tank 40, a supply module 50, and a control unit 60.

The body frame 10 is a skeleton that supports the vehicle 1. The vehicle body frame 10 has a pair of side frames 11 extending in the front-rear direction of the vehicle 1 and a cross member 12 extending in the vehicle width direction to connect the pair of side frames 11. A mudguard 15 for mudguards provided around the front wheels 16 is fixed to the vehicle body frame 10 via stays (not shown).

The cab 20 is located at the front of the vehicle body frame 10. Inside the cab 20, a passenger compartment in which an occupant such as a driver sits is formed. The cab 20 is located above the engine attached to the body frame 10.

The fuel tank 30 stores the fuel supplied to the engine. The fuel tank 30 is supported by the side frame 11 of the vehicle body frame 10 in a state of being exposed to the outside.

The urea water tank 40 stores urea water for purifying NOx (nitrogen oxides) in the exhaust gas of the engine. The urea water stored in the urea water tank 40 is appropriately injected into the exhaust pipe of the engine by the injection nozzle. NOx in the exhaust gas is reduced and purified by ammonia generated from the injected urea water.

The supply module 50 supplies the urea water from the urea water tank 40 to the injection nozzle. The supply module 50 has, for example, a supply pump that supplies urea water to the injection nozzle. The supply module 50 is arranged in a line with the urea water tank 40 along the vehicle width direction, and the supply module 50 is located on the side frame 11 side. The supply module 50 and the urea water tank 40 are supported by the support bracket 52.

The control unit 60 has a function of controlling the operation of a predetermined unit of the vehicle 1. Here, the control unit 60 is a DCU for controlling the injection amount of urea water by the injection nozzle. However, the present invention is not limited to this, and the control unit 60 may be a control unit other than the DCU.

The control unit 60 has a housing that houses the control board. Further, the control unit 60 is fixed to the side frame 11 via a fixing bracket 70 so as to be exposed to the outside.

By the way, the circuit of the control board of the control unit 60 operates appropriately when the pressure in the housing is in a stable state. Therefore, the housing is provided with an intake hole for adjusting the pressure. Further, as will be described in detail later, the control unit 60 employs a cover structure for appropriately preventing water (particularly, water when washing the car with a high pressure washer) from entering through the intake hole.

<Detailed configuration of control unit>
The detailed configuration of the control unit 60 will be described with reference to FIGS. 2 to 4.

FIG. 2 is a schematic diagram for explaining an example of the configuration of the control unit 60. FIG. 3 is a schematic view showing the control unit 60 as viewed from the direction A of FIG. FIG. 4 is a schematic view showing a state in which the waterproof cover 72 is removed from the control unit 60 of FIG.

The control unit 60 is a unit in which a control board is housed inside a box-shaped housing. The control unit 60 is fixed to the side frame 11 so as to be exposed to the outside. As shown in FIG. 2, the control unit 60 has a unit main body 62, a fixing bracket 70, and a waterproof cover 72.

The unit main body 62 is the main body of the control unit 60. As shown in FIG. 4, the unit main body 62 has a housing 64, a control board 65, an intake hole 66, and a connector mounting portion 67.

The housing 64 is a box-shaped case. The housing 64 has a space for arranging the control board 65 inside. In addition to the control board 65, this space also includes air. The housing 64 is fixedly supported by the fixing bracket 70 by the fixing portion 64b.

The control board 65 is a board provided inside the housing 64. A control circuit is formed on the control board 65. The control circuit controls, for example, the amount of urea water injected by the injection nozzle.

The intake hole 66 is provided on the main surface 64a of the housing 64. The intake hole 66 is a hole for allowing air to flow into the housing 64 or for air to flow out from the inside of the housing 64 to the outside. The pressure inside the housing 64 is adjusted by the inflow and outflow of air through the intake hole 66. By adjusting the pressure inside the housing 64 in this way, it is possible to prevent the occurrence of an abnormality in the control circuit of the control board 65. Although the intake hole 66 is provided with a packing member (not shown), this packing member does not have the ability to prevent water from entering during high-pressure car washing.

The connector mounting portion 67 is a portion to which a connector (not shown) is detachably mounted. For example, a connector of a cable connected to another unit is detachably attached to the connector attachment portion 67. As shown in FIG. 4, the connector mounting portion 67 is located outside the housing 64 in the vehicle width direction.

The fixing bracket 70 is a bracket for fixing the control unit 60 to the side frame 11. As shown in FIG. 3, the fixing bracket 70 has a support portion 71a, a bending portion 71b, and a fixing portion 71c. The support portion 71a supports the unit main body 62. The bent portion 71b is orthogonal to the supporting portion 71a and is in contact with the side frame 11. The fixing portion 71c fixes the bent portion 71b to the side frame 11.

The waterproof cover 72 is a cover member for preventing water from entering the inside of the housing 64 through the intake hole 66. The waterproof cover 72 is made of metal, for example. The waterproof cover 72 faces the main surface 64a provided with the intake hole 66 at a predetermined interval. The waterproof cover 72 has a facing portion 73 and a side wall portion 74.

The facing portion 73 is formed in a rectangular flat plate shape and faces the main surface 64a. The facing portion 73 covers the intake hole 66 and the surrounding portion of the main surface 64a.
The facing portion 73 also faces the connector mounting portion 67. Specifically, the facing portion 73 faces a wider range than the connector mounting portion 67. As a result, the facing portion 73 covers the connector mounting portion 67 (specifically, the connector 68 mounted on the connector mounting portion 67), and a third party intentionally removes the connector 68 from the connector mounting portion 67. Can't.

The side wall portion 74 is a wall protruding from the facing portion 73 in the normal direction (for example, the main surface 64a side). Specifically, it is bent from the outer side 73a of the facing portion 73 in the vehicle width direction and protrudes toward the main surface 64a. As a result, the side wall portion 74 has a function of a wall covering the gap between the facing portion 73 and the main surface 64a. Therefore, for example, when the vehicle 1 is washed, water is formed from the gap between the facing portion 73 and the main surface 64a. Can be suppressed from going toward the intake hole 66. In particular, when the vehicle is washed by the high pressure washer, the water column is discharged toward the vehicle 1, but the side wall portion 74 can prevent the water from flowing toward the intake hole 66. As a result, even if the performance of the packing member of the intake hole 66 is low, it is possible to prevent water from entering the control unit 60.

The side wall portion 74 may be bent from a side other than the side 73a of the facing portion 73. For example, the side wall portion 74 may be bent from the three sides 73a, 73b, and 73c of the facing portion 73 shown in FIG. 2, respectively. The sides 73b and 73c are sides connected to the side 73a. By providing the side wall portion 74 in this way, a wall is formed around the intake hole 66, and it is possible to effectively prevent water from heading toward the intake hole 66.

Further, as shown in FIG. 4, the side wall portion 74 is adjacent to the connector 68 mounted on the connector mounting portion 67. Therefore, the connector 68 is surrounded by the facing portion 73 and the side wall portion 74 of the waterproof cover 72. As a result, when the waterproof cover 72 is attached, the connector 68 interferes with the side wall portion 74 when the connector 68 is attached / detached, so that the connector 68 cannot be removed from the connector mounting portion 67. As a result, it is possible to prevent a third party from intentionally disconnecting the connector 68.

<Effect in this embodiment>
In the control unit 60 described above, the waterproof cover 72 facing the main surface 64a provided with the intake hole 66 has a facing portion 73 separated from the main surface 64a by a predetermined interval and a main surface 64a from the facing portion 73. It has a side wall portion 74 that protrudes to the side and closes a gap between the main surface 64a and the facing portion 73.
According to the above configuration, the side wall portion 74 functions as a wall that blocks the intrusion of foreign matter from the gap between the facing portion 73 and the main surface 64a. As a result, it is possible to prevent water from flowing toward the intake hole 66 from the gap between the facing portion 73 and the main surface 64a during a high-pressure car wash in which the water column is discharged to the vehicle 1. As a result, even if the performance of the packing member of the intake hole 66 is low, it is possible to prevent water from entering the inside of the control unit 60 during high-pressure car washing.

In the above, the control unit 60 is connected to the side frame 11, but the present invention is not limited to this. For example, the control unit 60 may be connected to the support bracket 52 of the supply module 50. Further, the control unit 60 may be connected to the stay of the mudguard 15.

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes can be made within the scope of the gist thereof. be. For example, the specific embodiment of the distribution / integration of the device is not limited to the above embodiment, and all or part of the embodiment shall be functionally or physically distributed / integrated in any unit. Can be done. Also included in the embodiments of the present invention are new embodiments resulting from any combination of the plurality of embodiments. The effect of the new embodiment produced by the combination has the effect of the original embodiment together.

1 Vehicle 60 Control unit 64 Housing 64a Main surface 65 Control board 66 Intake hole 67 Connector mounting part 68 Connector 70 Fixed bracket 72 Waterproof cover 73 Opposing part 74 Side wall part

Claims (4)

A control unit having a housing that houses the control board,
A bracket for fixing the control unit to a side frame extending in the front-rear direction of the vehicle so that the control unit is exposed to the outside.
An intake hole provided on the main surface of the housing located outside the side frame in the vehicle width direction of the vehicle, and
A cover member provided so as to face the main surface at a predetermined distance from the main surface,
With
The cover member is
A flat plate-shaped facing portion provided along the vehicle width direction and facing the main surface,
A side wall portion that protrudes from the facing portion toward the main surface side along the front-rear direction and closes a gap between the main surface and the facing portion.
The cover structure of the control unit. The facing portion has a rectangular shape and has a rectangular shape.
The side wall portion is bent from each of the three sides of the facing portion.
The cover structure of the control unit according to claim 1. The control unit is further provided with a connector mounting portion on which the connector is detachably mounted.
The facing portion faces the connector mounting portion.
The cover structure of the control unit according to claim 1 or 2. The side wall portion is adjacent to the connector mounted on the connector mounting portion.
The cover structure of the control unit according to claim 3.

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