JP5355066B2 - Arrangement structure of engine electronic control unit - Google Patents

Description

  The present invention relates to an arrangement structure of an engine electronic control device.

  As for engine electronic control devices installed in vehicles, the electronic control device for engines is kept away from the engine in order to reduce the electrical resistance as the control function speeds up and to simplify and shorten the wiring. It is required to be mounted on the engine instead of being arranged. In order to cope with this requirement, it is necessary to devise a mounting layout of the engine electronic control device in consideration of heat damage from the engine and workability during inspection and maintenance of the engine.

  Patent Document 1 discloses an arrangement in which an intake passage is arranged on a cylinder head of a one-cycle engine and an electronic control device for a vehicle is arranged in a mounting layout overlapping the intake passage in order to prevent thermal damage from the engine. Is done. In this case, the design of the intake passage is restricted, and the intake passage may be deteriorated by disposing the intake passage on the cylinder head of the one-cycle engine.

As for the arrangement structure of the vehicle electronic control unit, in order to simplify the wiring (harness), the vehicle electronic control unit is mounted at a location where the power supply lines of the vehicle are integrated, thereby multiplexing the control signal. There is known one in which the laying place of a communication line and a power supply line for supplying power is unified (Patent Document 2).
Patent No. 4028417 Japanese Patent Application Laid-Open No. 08-026048

  By the way, in a commercial vehicle such as a truck, if a large engine (large displacement) is used, the engine can be simplified and shortened in order to keep electric resistance small as the control function speeds up. Taking into account the heat damage from the engine and workability during inspection and maintenance of the engine, the layout of mounting the engine electronic control device on the engine is devised, and there is room (installation area), for example, the water for the cylinder block Although it may be possible to place the jacket on the outer wall that defines the jacket, there is no room for small and medium-sized engines, and it is difficult to devise the layout of the engine electronic control unit on the engine. The current situation is that it must be done.

  This invention aims at provision of the arrangement structure which can mount the electronic controller for engines in an engine also in a small and medium engine in view of such a present situation.

A first aspect of the present invention is a valve mechanism for an intake / exhaust valve disposed on an upper portion of a cylinder head, a rocker cover for covering the valve mechanism, an engine electronic control device mounted on the upper surface of the rocker cover, An engine comprising: a bracket that constitutes a board to which the engine electronic control device is attached; a stationary position where the bracket is attached to the cylinder head with respect to the cylinder head; An engine electronic control device comprising: a hinge that supports an openable and closable position between a retracted position that extends to the side of the engine; and a protective cover that covers the engine electronic control device in the steady position . Arrangement structure .

According to a second aspect of the present invention, in the first aspect, the upper surface of the rocker cover is composed of a bulging portion that forms a gas-liquid separation chamber inside the blow-by reduction device, and a flat portion lower than the bulging portion, The bracket of the engine electronic control device is arranged in a layout that overlaps the flat portion of the rocker cover, and the protective cover is formed on the front portion of the cover, and traveling wind is applied to the cover from above the bulging portion. It is characterized by comprising a running wind introduction section for guiding to the engine control device to be covered .

A third aspect of the invention is formed in the first or second aspect, a cooling pipe of the engine electronic control device disposed to the bracket, the circulation path of the fuel between the cooling pipe and the fuel tank Piping.

As another invention different from the first to third inventions, a valve operating mechanism of an intake / exhaust valve disposed on an upper portion of a cylinder head, a rocker cover covering the valve operating mechanism, and an upper surface of the rocker cover An engine electronic control device to be mounted, and an engine comprising: means for attaching the engine electronic control device so as to overlap an upper surface of the rocker cover; and covering the valve mechanism with the rocker cover with respect to the cylinder head A configuration is also assumed in which a hinge is provided that supports an openable and closable position between a steady position and a retracted position that develops to the side of the cylinder head .

In the case of the assumed another invention, a cooling pipe of an engine electronic control device disposed on the upper surface of the rocker cover, and a pipe forming a fuel circulation path between the cooling pipe and the fuel tank, It is good to prepare .

In the above-mentioned another invention, it is preferable to provide a protective cover that covers the engine electronic control device in a steady position. In that case, the upper surface of the rocker cover is composed of a bulging portion that forms the gas-liquid separation chamber of the blow-by reduction device on the inside, and a flat portion lower than this, and the bracket of the electronic control device for an engine includes: Arranged in a layout overlapping the flat part of the rocker cover, the protective cover is formed at the front part of the cover and guides the traveling wind from above the bulging part to the engine control device covered by the cover. It is assumed that a traveling wind introduction part is provided .

In the first to third aspects of the invention , the engine electronic control unit is disposed on the upper surface of the rocker cover. There is a space between the valve mechanism of the intake / exhaust valve disposed at the upper part of the cylinder head and the rocker cover that covers the valve mechanism. In commercial vehicles, the upper surface of the rocker cover Therefore, the heat damage from the engine to the engine electronic control device can be sufficiently prevented. The engine electronic control device is small in weight and volume, and even if it is mounted on the top surface of the rocker cover, it will not cause any trouble in removing the rocker cover from the top of the cylinder head. In this case, the engine electronic control unit can move between the steady position and the retracted position (the bracket is opened and closed via a hinge), so the rocker cover should be placed above the cylinder head when checking and servicing the valve mechanism. The workability is ensured satisfactorily by unfolding it to the retracted position when removing it. That is, workability at the time of inspection and maintenance of the valve mechanism is also ensured.

In the second aspect of the invention, the protective cover can not only prevent flooding of the steady-state engine electronic control device at the steady position, but also from the upper portion of the rocker cover bulge by the traveling wind introduction portion. The traveling wind can be guided to the ECU 20 covered with the protective cover .

  In the third aspect of the invention, the engine electronic control device is cooled by the fuel flowing through the cooling pipe, so that heat damage from the engine can be effectively prevented. By using piping that can be deformed, such as expansion and contraction, following the movement (opening and closing) of the engine electronic control device, the circulation path can be maintained in the connected state even during inspection and maintenance of the valve mechanism. it can. In other words, when inspecting and maintaining the valve operating mechanism, it is not necessary to disconnect the piping and worry about fuel leakage.

As another invention different from the first to third inventions, a valve operating mechanism of an intake / exhaust valve disposed on an upper portion of a cylinder head, a rocker cover covering the valve operating mechanism, and an upper surface of the rocker cover An engine electronic control device to be mounted, and an engine comprising: means for attaching the engine electronic control device so as to overlap an upper surface of the rocker cover; and covering the valve mechanism with the rocker cover with respect to the cylinder head Assuming a configuration that includes a hinge that supports an openable and closable position between a steady position and a retracted position that extends to the side of the cylinder head, the rocker cover is located between the steady position and the retracted position via the hinge. Since the engine electronic control unit is attached to the top surface of the rocker cover, it is necessary to check and maintain the valve mechanism. Only cover may be opened and closed, the working improvement in efficiency is obtained, the effect can be considered that.

In the case of the assumed another invention, a cooling pipe of an engine electronic control device disposed on the upper surface of the rocker cover, and a pipe forming a fuel circulation path between the cooling pipe and the fuel tank, Assuming the configuration of being provided, the engine electronic control device is cooled by the fuel flowing through the cooling pipe, so that heat damage from the engine can be effectively prevented. By using piping that can be deformed, such as expansion and contraction, following the movement (opening and closing) of the rocker cover, the circulation path is connected without disconnecting from the fuel tank side even during inspection and maintenance of the valve mechanism. Can be maintained. In other words, it can be considered that there is no need to disconnect the piping and worry about fuel leakage when inspecting and maintaining the valve mechanism.

In another aspect of the invention, a protective cover is provided to cover the engine electronic control device in a steady position, and the upper surface of the rocker cover is a bulging portion that forms a gas-liquid separation chamber of the blow-by reduction device inside. A bracket portion of the engine electronic control device is arranged in a layout overlapping the flat portion of the rocker cover, and the protective cover is formed on the front portion of the cover, Assuming a configuration in which a traveling wind introduction unit for guiding traveling wind from above the bulging portion to an engine control device covered by the cover is provided, the protective cover allows the steady-state engine electronic control device at a steady position. In addition to being able to prevent flooding, etc., the traveling wind introduction part covers the traveling wind from above the bulging part of the rocker cover with a protective cover. Can be guided to 20, the effect can be considered that.

  An embodiment of the present invention will be described based on the drawings. 1 to 4, reference numeral 10 denotes an engine (diesel engine) mounted on a commercial vehicle such as a truck, and includes a cylinder block 11 and a cylinder head 12.

  An upper part of the cylinder head 12 is provided with a valve operating mechanism 14 (see FIG. 5) for opening and closing the intake valve and the exhaust valve, and a rocker cover 13 covering the valve operating mechanism 14 is provided. The upper surface of the rocker cover 13 is composed of a bulging portion 13a that forms a gas-liquid separation chamber (where gas and a portion are separated) of the blow-by reduction device, and a flat portion 13b that is lower than the bulging portion 13a. The control device 20 (ECU) is arranged in a layout that overlaps the flat portion 13b.

  The engine electronic control device 20 has a function of controlling the fuel injection amount of the engine and the like, and wirings 22 (harnesses) for control signals and power supply are connected to a harness junction (relay device) 21. A bracket 25 that constitutes a mounting board of the engine electronic control device 20 is provided, and the engine electronic control device 20 board is attached to the bracket 25 that overlaps the flat portion 13b of the rocker cover 13 in a supported state. Note that the electronic components and the repeater 21 are arranged on the board in a connected state via printed wiring.

  One side of the bracket 25 is supported on the upper part of the cylinder head 12 (a peripheral wall 12a surrounding the valve mechanism 14 in FIG. 5) via a hinge 26. The hinge 26 includes a pair of hinge brackets 26a formed on one side of the bracket (two pins are arranged on the same axis in the opposite direction) and a pair projecting outside the peripheral wall 12a of the cylinder head 12. Hinge bracket 26b (having pin holes corresponding to each pin), and by engaging these pins with the pin holes, the bracket 20 is connected to the cylinder head 12 by the ECU 20 (engine electronic control unit) and the bracket 25. The rocker cover 13 is supported so as to be openable and closable (movable) between a steady position overlapping the flat portion 13a of the rocker cover 13 and a retracted position where the rocker cover 13 extends to the side.

  A U-shaped cooling pipe 27 is disposed so as to surround the engine electronic control unit 20 on the bracket 25. A pipe for forming a fuel circulation path is provided between the cooling pipe 27 and the engine fuel tank 40 (see FIG. 4). 1-3, 30a, 30b shows a part of the piping.

  FIG. 4 is a schematic diagram illustrating the configuration of the fuel supply system. The fuel in the fuel tank 40 is supplied to one end of the cooling pipe 27 through the filter 42 by the low-pressure pump 41, flows through the cooling pipe 27, and from the other end. It is supplied to the high-pressure pump 43, is pressurized by the high-pressure pump 43 after passing through the filter 44, and is supplied to the common rail 45. The fuel injection valve 46 (injector) injects the fuel supplied from the common rail 45 with a predetermined time and a predetermined period according to the operating state. Excess fuel in the common rail 45, the fuel injection valve 46, the high pressure pump 43, and the filter 44 is returned to the fuel tank 40 via the filter 42. Accordingly, during operation of the engine, fuel constantly flows from the fuel tank 40 through the cooling pipe 27 to cool the periphery of the cooling pipe 27.

  With such a configuration, the ECU 20 is disposed on the upper surface of the rocker cover 13, and the valve mechanism 14 of the intake / exhaust valve disposed on the upper part of the cylinder head 12, the rocker cover 13 covering the valve mechanism 14, In addition, in commercial vehicles and the like, the upper surface of the rocker cover 13 is likely to allow running wind to flow, so that heat damage from the engine to the ECU 20 can be sufficiently prevented. The ECU 20 is small in weight and volume, and even if it is mounted on the upper surface of the rocker cover 13, the removal of the rocker cover 13 from the upper portion of the cylinder head 12 will not be hindered.

  In this case, since the ECU 20 can move (open / close) between the steady position and the retracted position, the rocker cover 13 is expanded to the retracted position as shown in FIG. Can be easily detached, and workability can be improved.

  Since the ECU 20 is cooled by the fuel flowing through the cooling pipe 27 during engine operation, it is possible to effectively prevent thermal damage from the engine. Piping (a part of which is composed of 30a and 30b) can be circulated even during inspection and maintenance of the valve mechanism 14 by using a pipe that can be deformed such as expansion and contraction following the movement (opening and closing) of the ECU 20. The road can be kept connected. That is, at the time of inspection / maintenance of the valve mechanism 14, it is not necessary to disconnect the pipes 30a and 30b from the fuel supply system, and there is no need to worry about fuel leakage.

  FIG. 6 illustrates another embodiment. The engine electronic control unit 20 </ b> A (ECU) is attached to the flat portion 13 b of the rocker cover 13. That is, the ECU 20 </ b> A board is fastened to a support state where the board overlaps the flat portion 13 b of the rocker cover 13.

  One side of the rocker cover 13 is supported on the upper part of the cylinder head 12 (a peripheral wall 12 a surrounding the valve operating mechanism 14) via a hinge 50. The hinge 50 protrudes outward from the peripheral wall 12a of the cylinder head 12 and a pair of hinge brackets 50a formed on one side of the rocker cover 13 (two pins are arranged coaxially in opposite directions). A pair of hinge brackets 50b (having pin holes corresponding to the respective pins), and the rocker cover 13 covers the valve mechanism 14 with respect to the cylinder head 12 by engaging the pins with the pin holes. And a retracted position where the cylinder head 12 is developed to the side of the cylinder head 12 is supported so as to be openable and closable (movable).

  In FIG. 5, 27 is a cooling pipe, 30a and 30b are a part of piping which forms the fuel circulation path between the cooling pipe 27 and the engine fuel tank 40 (refer FIG. 4), 21 is A repeater (harness junction) disposed on the board of the ECU 20A, 22 is a control signal and power supply wiring (harness) connected to the repeater 21, and these include the ECU 20A and FIG. -It is comprised similarly to the case of FIG.

  In this case, the same effect as that of the above-described embodiment can be obtained, and the rocker cover 13 can be opened and closed (moved) via the hinge 50, and the ECU 20A is attached to the upper surface of the rocker cover 13, so that the valve operating mechanism 14 At the time of inspection / maintenance, only the rocker cover 13 needs to be opened and closed, and the inspection / maintenance work can be performed more efficiently and easily than the above-described embodiment (see FIGS. 1 to 5).

  FIG. 7 illustrates another embodiment, and the rocker cover 13 is provided with a protective cover 52 that covers the engine electronic control unit (ECU) at the stationary position. This protective cover 52 can prevent flooding of the engine electronic control device at the steady position. The configuration other than the protective cover 52 is set in the same manner as in the embodiment of FIGS. 1 to 5 or the embodiment of FIG.

  When the configuration other than the protective cover 52 is the same as that of the embodiment of FIGS. 1 to 5, the protective cover 52 is detachably assembled to the rocker cover 13. In FIG. 7, reference numeral 53 denotes a traveling wind introduction portion formed at the front portion of the protective cover 52, and guides the traveling wind to the ECU 20 covered with the protective cover 52. FIG. 8 displays an example in which the protective cover 52 is used as a saucer below the ECU 20 in the retracted position.

  The layout of the engine electronic control unit (ECU) according to the present invention mounted on the engine is not limited to a medium-to-small engine, and can of course be applied to a large engine.

It is a perspective view which illustrates the mounting layout to the engine of ECU. It is A arrow directional view of FIG. It is a top view of FIG. It is a schematic diagram explaining the structure of a fuel supply system. It is an operation explanatory view at the time of inspection and maintenance. It is a perspective view at the time of the inspection and maintenance explaining another embodiment. It is a perspective view explaining another embodiment. It is a perspective view at the time of the inspection and maintenance explaining another embodiment.

Explanation of symbols

10 engine (diesel engine)
DESCRIPTION OF SYMBOLS 11 Cylinder block 12 Cylinder head 13 Rocker cover 14 Valve mechanism 20, 20A Engine electronic control unit (ECU)
22 Wiring (harness)
25 Bracket 26 Hinge 27 Cooling pipe 30a, 30b Piping 40 Fuel tank

Claims (3)

In an engine provided with a valve operating mechanism of an intake / exhaust valve disposed on an upper part of a cylinder head, a rocker cover covering the valve operating mechanism, and an engine electronic control device mounted on an upper surface of the rocker cover ,
A bracket constituting a board to which the engine electronic control device is attached;
A hinge that supports the bracket with respect to the cylinder head so that the bracket can be opened and closed between a steady position where the bracket overlaps the upper surface of the rocker cover and a retracted position where the bracket extends to the side of the rocker cover; ,
An engine electronic control device arrangement structure , comprising: a protective cover that covers the engine electronic control device in the steady position . The upper surface of the rocker cover is composed of a bulging portion that forms the gas-liquid separation chamber of the blow-by reduction device inside, and a flat portion lower than this,
The bracket of the engine electronic control device is arranged in a layout overlapping the flat portion of the rocker cover,
The said protective cover is formed in the front part of this cover, and is provided with the introduction part of the driving | running | working wind which guides driving | running | working wind from the upper part of the said bulging part to the control apparatus for engines covered with this cover. 1. An arrangement structure of an engine electronic control device according to 1. 2. A cooling pipe of an engine electronic control device disposed on the bracket, and a pipe forming a fuel circulation path between the cooling pipe and a fuel tank. The arrangement structure of the engine electronic control device according to Item 2.

Images