JP6474646B2 - Vehicle control device - Google Patents

Description

  The present invention relates to a control device for a vehicle equipped with an internal combustion engine and a cooling device for the internal combustion engine, and more particularly to a control device for controlling the internal combustion engine and the cooling device for the internal combustion engine by an electronic control unit.

  Patent Document 1 discloses a blower resistor cooling structure for a vehicle air conditioner. In this cooling structure, the blower resistor is covered by a waterproof cover fixed to the substrate on which the blower resistor is provided, and the blower resistor covered by the waterproof cover is provided in the cooling water channel system of the engine.

Japanese Utility Model Publication No. 61-201914

  For control of an internal combustion engine or the like, an electronic control unit including a CPU (Central Processing Unit) and a storage circuit is widely used. Since this electronic control unit is arranged in the engine room in which the internal combustion engine is accommodated or in the vicinity of the engine room, the temperature of the CPU and other electronic components may exceed the upper limit temperature. Therefore, it is desired to arrange the electronic control unit in the engine room and to cool it stably.

  The electronic control unit can be stably cooled by disposing the electronic control unit in the cooling water channel system of the engine instead of the blower register shown in Patent Document 1 described above. When covered with, the volume increases as a whole, and there is a problem that resistance to cooling water circulating in the cooling water channel system increases.

  The present invention has been made paying attention to this point, and includes an electronic control unit that controls an internal combustion engine mounted on a vehicle or an auxiliary device including a cooling device for the internal combustion engine, and the electronic control unit has a relatively simple structure. An object of the present invention is to provide a vehicle control device that can be stably cooled.

The invention according to claim 1 for achieving the above object, includes an internal combustion engine (1), the engine cooling device for cooling the internal combustion engine by circulating coolant (10) is attached to the internal combustion engine accompanying A control device for a vehicle comprising: an electronic control unit (20) for controlling at least one of the internal combustion engine and the auxiliary device; wherein the electronic control unit (20) The engine cooling device (10) is constituted by the wiring board (31) and the electronic components (32 to 35) arranged on the printed wiring board and waterproof-coated with the synthetic resin (30). radiators (2) it is mounted in a state of being immersed in the cooling water within the radiator (2) is, the lower tank having an outlet cooling water is discharged (15) (13 The electronic control unit (20) is mounted in the lower tank (13), and the lower tank (13) is attached to the mounting portion (16) for mounting the electronic control unit (20). ), And the mounting portion includes a mounting port (21) and a cylindrical connector fixing portion (22) extending inwardly from the mounting port, and the electronic control unit (20) and the control When the connector (41) to which the connection line from the object can be connected is integrated to form an electronic control unit (101) with a connector, and the connector (41) is fitted into the connector fixing portion (22) Further, the connector fixing portion (22) can be sealed so that the cooling water in the lower tank (13) does not leak, and the electronic control unit (101) with a connector is connected to the connector. (41) is fitted to the connector fixing portion (22), and said electronic control unit (20), characterized in Rukoto mounted in the state positioned inside said lower tank (13).
Examples of the auxiliary device include an exhaust gas recirculation device and an evaporated fuel processing device in addition to the engine cooling device.

According to this configuration, since the electronic control unit is waterproof-coated with the synthetic resin, waterproofing is possible with a relatively thin coating. Therefore, even if a waterproof-coated electronic control unit is mounted in a radiator soaked in cooling water, an increase in resistance to circulating cooling water can be minimized, and the electronic control unit Stable cooling is possible. In addition, since the vibration of the internal combustion engine is not directly transmitted to the radiator, there is an advantage that the problem due to the vibration does not easily occur, and the water pressure is relatively low at a position away from the discharge hole of the cooling water pump. Therefore, there is an advantage that it is easy to ensure waterproofness. Further, in the lower tank near the discharge port from which the cooling water is discharged, the temperature of the cooling water becomes the lowest temperature in the cooling system, so that the cooling effect can be enhanced. In addition, the electronic control unit with a connector can be inserted into the lower tank through the mounting port in front of the electronic control unit, and the connector can be fixed while sealing the connector fixing portion by fitting the connector into the connector fixing portion. Workability when mounting the control unit in the lower tank can be improved.

According to a second aspect of the invention, in the control apparatus for a vehicle according to claim 1, O-ring (44) to be fitted groove at the peripheral portion (43) is provided in said connector (41), The connector (41) is fitted into the connector fixing portion (22) in a state where the O-ring (44) is mounted.
According to this configuration, since the connector is fitted into the connector fixing portion with the O-ring attached, leakage of cooling water can be reliably prevented with the electronic control unit attached.

The invention according to claim 3 is the vehicle control device according to claim 2 , wherein the connector fixing portion (22) is an O-ring into which an O-ring (44) attached to the connector (41) can be fitted. It has a fixing member (24), It is characterized by the above-mentioned.
According to this configuration, when the connector is fitted into the connector fixing portion, the O-ring attached to the connector is fitted into the O-ring fixing member, so that the connector is securely fixed and cooling water leakage is more reliably performed. Can be prevented.

According to a fourth aspect of the present invention, in the vehicle control device according to any one of the first to third aspects, the mounting portion (16) protrudes from an inner wall surface and supports the electronic control unit (20). The electronic control unit (20) is supported by the support member (23) in a state of being mounted in the lower tank (13).

  According to this configuration, the electronic control unit is supported by the support member provided in the mounting portion in a state of being mounted in the lower tank, so that the printed wiring board is damaged even if vibration is caused by traveling of the vehicle. Can be surely avoided.

According to a fifth aspect of the present invention, in the vehicle control device according to any one of the first to fourth aspects, the mounting portion (16) is mounted with the connector-attached electronic control unit (101). The printed wiring board (31) is disposed so as to be substantially perpendicular to the vertical direction of the radiator (2).
According to this configuration, the structure of the mounting portion is relatively simple, which is suitable when there is a sufficient space behind the lower tank (on the internal combustion engine side).

According to a sixth aspect of the present invention, in the vehicle control device according to any one of the first to fourth aspects, the mounting portion (51) is mounted with the connector-attached electronic control unit (101). The printed wiring board (31) is disposed so as to be substantially parallel to the vertical direction of the radiator (2).
According to this configuration, the horizontal length of the mounting portion is shortened, and the mounting portion can be provided even when there is no space behind the lower tank.

A seventh aspect of the present invention is the vehicle control apparatus according to any one of the first to sixth aspects, wherein the electronic control unit (20) detects a temperature (TW) of the cooling water. An element (33) is provided.

  According to this configuration, by mounting the electronic control unit in the lower tank, it is possible to simultaneously mount the temperature detection element that detects the cooling water temperature. In a vehicle control device, in order to monitor the temperature of the engine, it is essential to detect the temperature of the cooling water, and the number of steps for separately mounting the cooling water temperature sensor can be reduced. Further, the coolant temperature detected by the temperature detecting element can be immediately converted into digital data by the electronic control unit, and used as it is for control or transmitted to another electronic control unit. As a result, the connection line between the temperature detection element and the electronic control unit can be reduced.

1 is a block diagram showing a schematic configuration of a cooling device for an internal combustion engine mounted on a vehicle according to an embodiment of the present invention. It is a figure for demonstrating the structure of a radiator (2). It is a figure for demonstrating the structure of the attachment part (16) of the electronic control unit in a lower tank (13). It is a figure for demonstrating the structure of an electronic control unit (20) and an electronic control unit with a connector (101). It is a figure which shows the state which mounted | wore the attachment part (16) shown in FIG. 3 with the electronic control unit (101) with a connector. It is a figure which shows the modification of the structure shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of an internal combustion engine cooling device (engine cooling device) mounted on a vehicle according to an embodiment of the present invention. The engine cooling device 10 includes an internal combustion engine (hereinafter referred to as “engine”). The cooling water passage 1a provided in 1), the radiator 2, the cooling fan 3, the water pump 4, and the cooling water passages 5, 6, and 7 connected to each other are provided. An electronic control unit (hereinafter referred to as “ECU”) 20 is provided in the radiator 2. The ECU 20 is connected to another electronic control unit (not shown) via a CAN (Control Area Network) and the cooling fan 3. The drive control is performed.

  The cooling water discharged from the water pump 4 flows into the radiator 2 through the cooling water passage 5, the cooling water passage 1 a of the engine 1, and the cooling water passage 6, and the temperature of the cooling water is lowered by the radiator 2. The cooling water whose temperature has decreased returns to the water pump 4 through the cooling water passage 7.

  As shown in FIG. 2, the radiator 2 includes an upper tank 11, a radiator core 12, and a lower tank 13. A cooling water passage 6 is connected to the upper tank 11, an inflow port 14 through which cooling water flows is provided, and a cooling water passage 7 is connected to the lower tank 13, and a discharge port 15 through which the cooling water is discharged is provided. . The lower tank 13 includes a mounting portion 16 for mounting the ECU 20. The upper tank 11 and the lower tank 13 are made of synthetic resin.

  3A is a diagram (partial sectional view of the lower tank 13) for explaining the mounting portion 16 in more detail. FIG. 3B is a diagram illustrating the mounting portion 16 shown in FIG. FIG. 3C is a cross-sectional view taken along line AA in FIG. The attachment portion 16 protrudes from the lower tank main body and is formed in a cylindrical shape having a rectangular cross section. The attachment portion 21, a tubular connector fixing portion 22 that extends from the attachment port 21 toward the inside of the lower tank 13, and will be described later. An O-ring fixing member 24 into which an O-ring 44 attached to the connector 41 can be fitted, and a support member 23 that supports the ECU 20 are provided. The O-ring fixing member 24 is formed in a rectangular ring shape (over the entire circumference of the inner wall) by protruding a part of the inner wall of the connector fixing portion 22. The support member 23 protrudes from the left and right inner walls of the mounting portion 16 and includes a plurality of protrusions for supporting the ECU 20 from above and below.

  As shown in FIG. 4A, the ECU 20 includes an integrated circuit 32 disposed on the printed circuit board 31, other electronic components 33, 34, and 35, and other electronic components (not shown). 30 is entirely coated (waterproof coating). The waterproof film 30 is made of a synthetic resin, and for example, a paraxylylene polymer can be used as the synthetic resin. The thickness of the waterproof coating 30 is, for example, about 25 μm, and the volume increased by the waterproof coating of the ECU 20 is almost negligible. In FIG. 4, the waterproof coating 30 is shown thicker than it actually is for the sake of explanation. As a technique for coating the waterproof film 30, for example, vapor deposition is applied. By coating the waterproof film 30, not only the waterproof effect but also the damage caused by the foreign matter mixed in the cooling water and the chemical change of the electronic component due to a small amount of impure components can be prevented.

  In the present embodiment, a temperature detection element is mounted as the electronic component 33 and is applied to the detection of the coolant temperature TW. The detected coolant temperature TW is used for operation control of the cooling fan 3 and is transmitted to another ECU (for example, engine control ECU) via the CAN.

  In the present embodiment, as shown in FIG. 4B, the ECU 101 with a connector is configured by integrating the ECU 20 with a connector 41 made of synthetic resin, and the ECU 101 with a connector is attached to the mounting portion 16 of the lower tank 13 shown in FIG. It is attached to. The connector 41 is configured to be able to seal the connector fixing portion 22 so that the cooling water in the lower tank 13 does not leak when fitted into the connector fixing portion 22.

  FIG. 4B shows a side view of the connector-equipped ECU 101 and a front view of the connector 41 as viewed from the right side of the figure. The connector 41 is provided with a plurality of grooves 43 into which rubber O-rings 44 can be mounted, and a plurality of connector pins 42. A connection line, a power supply line, a CAN connection line, and the like from the control target are connected to the ECU 20 via a connector pin 42. The connector pin 42 is connected to the metal wiring pattern on the printed wiring board 31. Note that the waterproof coating 30 is deleted at the connected portion. FIG. 4C shows a state where the O-ring 44 is mounted in the groove 43.

  FIG. 5 is a diagram showing a state (solid line) in which the ECU 101 with a connector is mounted in the lower tank 13. Inserted from the attachment port 21. At this time, the ECU 20 is inserted between the support members 23 and supported by the support members 23. The connector 41 is fixed to the connector fixing portion 22 in a state where the O-ring 44 is fitted into the O-ring fixing member 24. By mounting the ECU 101 with the connector together with the O-ring 44, the ECU 20 is mounted in the lower tank 13, and the connector fixing portion 22 is sealed by the O-ring 44 and the connector 41, thereby preventing the coolant from leaking out.

  As described above, in the present embodiment, since the ECU 20 is covered with the waterproof film 30 of synthetic resin, waterproofing is possible with a relatively thin coating. Therefore, even if the waterproof coated ECU 20 is mounted in the radiator 2 while being immersed in the cooling water, an increase in resistance to the circulating cooling water can be suppressed to a minimum, and the ECU 20 can be stably operated. Cooling is possible. In addition, since the vibration of the engine 1 is not directly transmitted to the radiator 2, there is an advantage that the problem due to the vibration is relatively less likely to occur, and the water pressure is compared at a position away from the discharge hole of the water pump 4. Therefore, there is an advantage that it is easy to ensure waterproofness.

  Further, in the lower tank 13 near the discharge port 15 from which the cooling water is discharged, the temperature of the cooling water is close to the lowest temperature in the cooling device 10, so that the cooling effect can be enhanced. The cooling water temperature TW is about 70 to 80 ° C. after the warm-up of the engine 1 is completed. However, since the upper limit temperature for use of the electronic components of the ECU 20 is about 110 ° C., a sufficient cooling effect can be obtained.

  The ECU 20 and the connector 41 are integrated in advance to form an ECU 101 with a connector. The ECU 101 with a connector is inserted into the lower tank 13 from the attachment port 21 with the ECU 20 in front, and the connector 41 is fitted into the connector fixing portion 22. Since it is fixed, the workability when the ECU 20 is mounted in the lower tank 13 can be improved by mounting the ECU 101 with a connector. Further, since the connector 41 is fitted into the connector fixing portion 22 with the O-ring 44 mounted, leakage of the cooling water can be reliably prevented with the ECU 20 mounted.

  Further, when the connector 41 is fitted into the connector fixing portion 22, the O-ring 44 attached to the connector 41 is fitted into the O-ring fixing member 24, so that the connector 41 can be securely fixed and cooling water can be leaked more. It becomes possible to prevent reliably.

  In addition, since the ECU 20 is supported by the support member 23 provided in the mounting portion 16 in a state of being mounted in the lower tank 13, there is a situation in which the printed wiring board 31 is damaged even if vibration is caused by traveling of the vehicle. It can be avoided reliably.

  Further, since the mounting portion 16 is provided so that the printed wiring board 31 is disposed at an angle perpendicular to or near the vertical direction of the radiator 2 when the ECU 101 with a connector is mounted, the structure of the mounting portion 16 is This is relatively simple, and is suitable when there is room in the space behind the lower tank 13 (on the engine 1 side).

  Further, since the temperature detection element is arranged as the electronic component 33 on the printed wiring board 21 and can be used for detection of the cooling water temperature TW, the cooling water temperature TW can be detected by mounting the ECU 20 in the lower tank 13. it can. In the vehicle control device, in order to monitor the temperature of the engine 1, it is essential to detect the cooling water temperature TW, and the number of steps for installing the cooling water temperature sensor separately can be reduced. Further, the coolant temperature TW detected by the temperature detecting element can be immediately converted into digital data by the ECU 20 and used as it is for controlling the cooling fan 3 or transmitted to another ECU. As a result, the connection line between the temperature detection element and the ECU can be reduced.

  The present invention is not limited to the embodiment described above, and various modifications can be made. For example, when there is no space behind the lower tank 13 (on the engine 1 side), the printed wiring board 31 is in a state parallel to or close to the vertical direction of the radiator 2 as in the lower tank 13a shown in FIG. It is desirable to provide the attachment portion 51 so as to be disposed. The attachment portion 51 includes an attachment port 52, a connector fixing portion 53, a support member 54, and an O-ring fixing member 53. By inserting the ECU 101 with a connector through the attachment port 52 from above in the drawing, the ECU 20 Is mounted in the lower tank 13a.

  According to this modification, the mounting portion 51 can be provided even when the horizontal length of the mounting portion 51 is shortened and there is no space behind the lower tank 13.

  The ECU 20 is not limited to the one that controls the cooling fan 3. For example, the ECU 20 performs a part of the control of the engine 1 (fuel injection control, ignition timing control), and the exhaust gas recirculation that is an auxiliary device of the engine 1. It may be one that controls the apparatus and / or the evaporated fuel processing apparatus. When the engine 1 is controlled, a process of generating a crank angle pulse signal from an output signal of a crank angle position sensor that detects the rotation angle position of the crankshaft of the engine 1 may be performed.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Radiator 10 Cooling device 13 Lower tank 15 Discharge port 16 Mounting part 20 Electronic control unit 21 Mounting port 22 Connector fixing part 23 Support member 24 O ring fixing member 30 Waterproof film 31 Printed wiring board 32 Integrated circuit 41 Connector 42 Connector pin 43 Groove 44 O-ring 101 ECU with connector (electronic control unit with connector)

Claims (7)

An internal combustion engine, by circulating cooling water include engine cooling device for cooling the internal combustion engine, wherein a control device for a vehicle equipped with accessory devices and incidental to the internal combustion engine, at least of the internal combustion engine and the accessory device In a control device including an electronic control unit that controls one,
The electronic control unit is composed of a printed wiring board and electronic components arranged on the printed wiring board, and is waterproof-coated with a synthetic resin so as to be immersed in cooling water in the radiator constituting the engine cooling device. It is installed in the state that has been
The radiator is provided with a lower tank having a discharge port through which cooling water is discharged at the bottom, and the electronic control unit is mounted in the lower tank,
The lower tank includes a mounting portion for mounting the electronic control unit,
The mounting portion has a mounting port and a cylindrical connector fixing portion extending inward from the mounting port,
The electronic control unit and a connector to which a connection line from the control target can be connected are integrated to form an electronic control unit with a connector, and when the connector is fitted into the connector fixing portion, the lower tank It is configured so that the connector fixing portion can be sealed so that the cooling water inside does not leak,
The connector with an electronic control unit, the connector is fitted into the connector fixing unit, and a control device for a vehicle in which the electronic control unit, characterized in Rukoto mounted in the state positioned inside said lower tank. The peripheral portion of the connector has a groove that can be mounted is provided an O-ring, the connector according to claim 1, characterized in that said O-ring is fitted to the connector fixing portion in a state of being mounted Vehicle control device. The vehicle control device according to claim 2 , wherein the connector fixing portion includes an O-ring fixing member into which an O-ring attached to the connector can be fitted. The mounting portion protrudes from an inner wall surface and has a support member capable of supporting the electronic control unit,
The electronic control unit, the control device for a vehicle according to any one of claims 1 to 3, characterized in that it is supported by the support member in a state of being mounted in the lower tank. The mounting portion, upon mounting the connector with an electronic control unit, from claim 1, characterized in that substantially perpendicularly the printed circuit board and the vertical direction of the radiator is provided so as to be disposed 4 The vehicle control device according to any one of the above. The mounting portion, upon mounting the connector with an electronic control unit, from claim 1, characterized in that the vertical direction as the printed circuit board substantially in parallel of the radiator is provided so as to be disposed 4 The vehicle control device according to any one of the above. The said electronic control unit is provided with the temperature detection element which detects the temperature of the said cooling water, The control apparatus of the vehicle in any one of Claim 1 to 6 characterized by the above-mentioned.

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