JP2012077674A - Engine control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ECU superior in resistance to water and vibration.SOLUTION: An ECU 30 includes a circuit board 5 and a case 18. The circuit board 5 is supported in a floating state so as not to be in contact with the case 18. A supporting member is composed of an elastic member 12 made of rubber, a coil spring, or the like. Elastic members 12 are formed to protrude outwardly from side surfaces of the circuit board 5 and are supported onto inner wall surfaces of the case 18. A harness through hole 32 is formed in the case 18. A seal 33 is disposed between the harness through hole 32 and a harness 29 which is laid through the harness through hole 32. External connection electrodes 16 to which the harness 29 is connected are disposed on the circuit board 5. Resin mold is applied to a surface of the circuit board other than a portion on which the electrodes 16 are disposed and a portion on which the elastic members 12 are formed.

Description

  The present invention relates to an engine control device, and more particularly to an engine control electronic device that can improve both water resistance and vibration resistance of a circuit board on which electronic components are mounted.

  An automobile, a motorcycle, or the like is equipped with an engine control device (hereinafter referred to as “ECU”) as an electronic device for controlling an internal combustion engine (engine). The ECU has a circuit board on which a circuit including electronic components is mounted. In Patent Literature 1, in an engine ignition device used in an environment where high and low temperatures are repeatedly applied, thermal stress generated in the circuit board and the circuit element due to a difference in thermal expansion coefficient between the circuit board and the circuit element and the potting resin is disclosed. In order to prevent joints such as solder joints and wire bonds from being peeled off or cracks caused by the action, a structure in which a resin filler for stress relaxation is mixed in a potting resin for molding a circuit element has been proposed. .

JP 2002-235644 A

  Incidentally, the circuit board is required to have water resistance and vibration resistance. According to the structure described in Patent Document 1, since the circuit board is covered with potting resin, vibration resistance and water resistance are considered. However, in the conventional structure, the amount of potting material increases, so that the weight increases and the cost may increase. Furthermore, it cannot be said that vibration resistance is fully considered. In particular, motorcycles are exposed to severe environmental conditions in terms of vehicle vibration compared to 4-wheeled vehicles such as passenger cars, so water resistance as well as vibration resistance and cost must be fully considered. .

  An object of the present invention is to provide an ECU having a structure in which both water resistance and vibration resistance are compatible and the cost can be reduced.

  In order to achieve the above object, the present invention provides a circuit board having an external connection electrode exposed on the surface and resin-molded on the entire surface except the electrode, and formed in a substantially rectangular parallelepiped, and the circuit In an engine control device comprising a case for housing a board, the circuit board is housed in a space so as to be in non-contact with the case, and is directed outward from a side surface of the circuit board. There is a first feature in that the elastic member is formed so as to protrude and the end of the elastic member is supported by the inner wall surface of the case.

  In addition, the present invention has a second feature in that an end portion of the elastic member is fitted into a support recess formed on an inner wall surface of the case.

  Further, according to the present invention, a harness through hole formed through the inside and outside of the case is formed in the case, and a seal is provided between the harness through hole and the harness routed through the harness through hole. There is a third feature in that.

  In the present invention, the electrode is an electrode to which the harness is connected, and the resin mold is a portion of the surface of the circuit board where the electrode is provided and a portion where the elastic member is formed There is a fourth feature in that it is applied to the portion excluding.

  Further, the present invention is characterized in that an external connection coupler is attached to one side of the case, and a conductive wire extending from the coupler and connected to an external connection electrode provided on the circuit board is provided. There is a fifth feature.

  In addition, the present invention has a sixth feature in that the case includes a case main body and a lid that covers the case main body, and the elastic member is sandwiched between the case main body and the fitting portion of the lid.

  The present invention has a seventh feature in that the elastic member is columnar or plate-shaped, and an eighth feature in that the elastic member is made of rubber or a coil spring.

  According to the present invention, a case in which the circuit board is accommodated is an ECU case attached to an engine throttle body, and the circuit board is supported in a floating state in the case by the elastic member. There are 9 features.

  Further, according to the present invention, the circuit board has the electrodes on the first surface and the second surface orthogonal to the end surface, respectively, and engages with the case so that the end surface faces the case. There is a tenth feature in that a protrusion is provided that restricts movement in a direction orthogonal to.

  Further, an ECU cover that covers the end surface of the case and has a rib extending toward the case side, and a gap formed between a wall portion provided in the case and a stay extending in parallel to the wall portion. Furthermore, there is an eleventh feature in that the rib is configured to be fitted.

  In addition, the present invention has a twelfth feature in that the resin mold is further applied excluding the protruding portion.

  Further, the present invention has a thirteenth feature in that the ECU having the first to twelfth features is mounted on a motorcycle and applied to a driving engine of the motorcycle.

  According to the present invention having the first to thirteenth features, the circuit board is molded and accommodated in the case, so double waterproofing is achieved. Further, since the circuit board is supported on the inner wall surface of the case by an elastic member, the circuit board main body is in a floating state where it does not contact the case. Therefore, since vibration applied to the case from the outside is attenuated without being directly transmitted to the circuit board, excessive stress is not applied to the elements on the board, and durability is improved. Further, since vibration is not easily transmitted to the circuit board, the degree of freedom in layout increases, for example, the ECU can be arranged at a position where vibration is large, such as in the vicinity of the engine. Furthermore, since a space (air layer) is provided between the case and the circuit board, the outside air temperature hardly affects the circuit board and heat resistance is improved.

  According to the present invention having the third feature, the waterproof effect can be obtained by the seal while facilitating electrical connection between the circuit board and the outside. According to the present invention having the fifth feature, it is possible to provide a coupler-integrated ECU that can electrically connect a circuit board and the outside through a coupler.

  According to the present invention having the sixth feature, the elastic member is held by the case body with the case lid opened, and the circuit board is supported by the case through the elastic member by covering the elastic member from above. Assembly workability is improved.

  According to the present invention having the seventh feature, the elastic member can be made into a simple shape to facilitate processing. According to the present invention having the eighth feature, the circuit board can be supported by a member made of an existing material such as rubber or a coil spring.

  According to the present invention having the ninth feature, even when the circuit board is housed in the case attached to the throttle body to which the vibration from the engine is transmitted, the vibration transmission can be reduced by the elastic member. The vibration resistance of the circuit board is ensured.

  According to the present invention having the tenth feature, in a circuit board having electrodes on both sides, the degree to which the electrodes and the terminals of the components that are electrically connected in contact with the electrodes are rubbed against each other by vibration is reduced. Thus, the wear resistance of the electrodes and terminals can be improved.

  According to the present invention having the eleventh feature, after the ECU cover is attached to the case, there is no room for the stay to bend upward by the rib, so that the circuit board and the ECU cover are relatively displaced. Can be suppressed. Therefore, since the relative position between the electrode provided on the circuit board and the terminal connected to the outside can be prevented from being displaced by vibration, it is possible to prevent the electrode and the terminal from rubbing against each other and causing wear. . Further, since the ECU cover and the case are in the fitted state, the strength of the case is also increased.

  According to the present invention having the thirteenth feature, it is possible to ensure the water resistance and vibration resistance of the ECU by applying it to a motorcycle having greater vibration than a four-wheeled vehicle.

It is a perspective view which shows the circuit board of ECU which concerns on one Embodiment of this invention. It is sectional drawing which shows the engaging part of a protrusion part and a case. It is a perspective view which shows the circuit board of ECU which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the engaging part of a protrusion part and a case. It is sectional drawing of ECU which accommodated the circuit board. It is a perspective view of ECU which connected the harness. It is sectional drawing of ECU. It is a perspective view of ECU which concerns on a modification. It is sectional drawing of ECU which concerns on a modification. It is principal part sectional drawing of the circuit board which shows the example which used the coil spring as a protrusion part. 1 is a side view of a motorcycle 1 to which a throttle device to which an ECU according to an embodiment of the present invention is attached is applied. It is an enlarged view of a throttle device part. It is principal part sectional drawing of a throttle device which has ECU containing a circuit board.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 11 is a side view of the motorcycle 1 to which a throttle device to which an ECU according to an embodiment of the present invention is attached is applied. FIG. 12 is an enlarged view of the throttle device portion of FIG. A head pipe 2 that supports the front fork 4 so as to be steerable is attached to a front end portion of the main frame 3. A pivot plate 62, a pair of left and right seat rails 17 that are welded to the front end of the main frame 3 and extended rearward, and an intermediate portion of the seat rail 17 and the pivot plate 20 A pair of left and right reinforcing frames 21 that connect the two are attached.

  A front wheel WF is pivotally supported at the lower end of the front fork 4, and a rod-shaped steering handle 63 is connected to the upper portion of the front fork 4. A front fender 6 that covers the upper side of the front wheel WF is supported by the front fork 4. Below the main frame 3, a water-cooled single-cylinder engine E having a cylinder axis slightly raised forward is disposed. The engine E is supported using a pivot plate 62 and a hanger plate 64 provided at an intermediate portion of the main frame 3.

  A pivot 65 penetrating the pivot plate 62 in the vehicle width direction supports a front end portion of the swing arm 66 so as to be swingable up and down. A rear wheel WR to which the output of the engine E is transmitted via the drive chain 23 is rotatably supported at the rear end of the swing arm 66. A rear cushion 19 is provided between the seat rail 17 and the swing arm 66. A fuel tank 67 is disposed between the pair of left and right seat rails 17, and a storage box 68 that is accessible by opening the openable seat 15 is disposed in front of the fuel tank 67 on the vehicle body. The rear upper part of the rear wheel WR is covered with a rear fender 69.

  A throttle device 10 is connected to the upper side wall of the cylinder head 11 of the engine E via an intake pipe. The throttle device 10 is provided with an ECU that will be described later. A fuel injection valve 27 (see FIG. 12) for injecting fuel toward the intake port of the cylinder head 11 is attached midway in the intake pipe. The upstream end of the throttle device 10 is connected to the air cleaner box 7. The exhaust pipe 71 is drawn out from the lower part of the engine E.

  A butterfly throttle valve that adjusts the amount of air supplied to the engine E is rotatably supported on the throttle device 10, and a throttle wire 141 is wound around a pulley 142 that is connected to the throttle valve.

  A synthetic resin vehicle body cover 13 that covers a part of the engine E, the throttle device 10 and the air cleaner box 7 is attached to the main frame 3. A leg shield 8 that covers the occupant's legs from the front is disposed in front of the vehicle body cover 13. The vehicle body cover 13 is provided with an opening 70 that allows adjustment of the throttle device 10 and heat removal from the engine E slightly behind the throttle device 10 in a side view of the vehicle body.

  FIG. 1 is a perspective view of an ECU body, that is, an ECU circuit board. The circuit board 5 is a substantially rectangular parallelepiped having a front surface 51 and its opposite surface (back surface), a lateral side surface 52 and its opposite surface, and a vertical side surface 53 and its opposite surface. Since the circuit board 5 is composed of a rectangular flat board body, a component mounted on the board body, and a resin mold that covers the board body and the component, the external shape is somewhat uneven depending on the height of the component. However, for the convenience of explanation, it will be described as a substantially rectangular parallelepiped.

  Of the six surfaces of the circuit board 5, columnar protrusions 12 are erected on the four surfaces excluding the front surface 51 and the back surface. The protrusion 12 is made of an elastic material (generally rubber) and is joined to the circuit board 5. The surface of the circuit board 5 is molded with a resin except for a portion where the protrusions 12 are provided. That is, the circuit board 5 has water resistance by a resin mold. The circuit board 5 can have a plurality of electrodes 16 on the surface 51 to which harnesses for electrical connection between components mounted on the board body of the circuit board 5 and the outside are connected. The distal end portion of the protruding portion 12 is supported by an ECU case (hereinafter simply referred to as “case”) that accommodates the circuit board 5 as will be described later.

  FIG. 2 is a cross-sectional view showing an engaging portion between the protruding portion 12 and the case 18. The case 18 has a support recess 181 on the inner surface side, and the tip of the protruding portion 12 is inserted into the support recess 181.

  The protrusion 12 may take other shapes as long as it is made of an elastic material. For example, not a cylinder but a polygonal column (for example, a quadrangular column) or a plate shape may be used.

  FIG. 3 is a perspective view according to a modified example of the circuit board, and the same reference numerals as those in FIG. 1 denote the same or equivalent parts. The circuit board 5 includes a plate-like protrusion 22 on the four surfaces 52 and 53 and the opposite surface. The protrusion 22 is preferably made of a plate-like or sheet-like rubber.

  FIG. 4 is a cross-sectional view showing an engaging portion between the protruding portion 22 and the case 18. The case 18 has a support recess 182 having a shape suitable for receiving the end, that is, the edge of the plate-like protrusion 22 on the inner surface side.

  FIG. 5 is a cross-sectional view of the ECU with the circuit board housed in the case. In FIG. 5, the circuit board 5 includes a plate-like protrusion 22, and the ECU 30 includes a case main body 183 and a lid 184. The case body 183 is provided with a step 24 for receiving the protruding portion 22, and the lower surface 22 a of the protruding portion 22 is supported by the step 24. Then, the lid 184 is put on the case body 183, and the upper surface 22 b of the protruding portion 22 is covered with the lid 184. The lid 184 and the case main body 183 are joined to each other by welding, for example. In this example, the support recess 182 of the protrusion 22 is formed by the lid 184 and the step 24 provided on the case body 183. As shown in FIG. 5, the circuit board 5 is held by the case 18 with a gap so as not to contact the inner surface of the case 18 except for the protruding portion 22. That is, the circuit board 5 has a space (air layer) A in the case 18 and is floating.

  6 is a perspective view of the ECU to which the harness is connected, and FIG. 7 is a cross-sectional view of the ECU shown in FIG. In FIG. 6, the case 18 is provided with a stay 25 for attaching the ECU 30 to the engine E on the side surface 26 and the opposite surface. In FIG. 7, a resin mold 28 is applied to the surface of the circuit board 5 except for the external connection electrode 16 and the protruding portion 22. Each electrode or signal line of the harness 29 is connected to the electrode 16, and the harness 29 is pulled out through a harness through hole 32 formed in the side surface 31 of the case 18. The harness through hole 32 is provided with a cylindrical member (boot) 33 made of rubber, and constitutes a waterproof seal between the harness 31 and the harness through hole 32. In the example shown in FIG. 7, the protruding portion 22 is not provided on the side from which the harness 29 is pulled out. That is, the circuit board 5 is supported in a floating state with the space (air layer) A in the case 18 by the three protruding portions 22.

  Thus, the protrusions 12 and 22 do not have to be provided on all four side surfaces of the circuit board 5, but may be provided on at least three side surfaces. Further, the support recess 182 that receives the plate-like protrusion 22 restricts the position of the side of the plate-like protrusion 22, that is, the plate-like protrusion 22 is not displaced in the plane. If the shape is set, it is only necessary to provide the protrusions 22 on the two opposing side surfaces of the circuit board 5.

  FIG. 8 is a perspective view of an ECU according to a modification, and FIG. 9 is a cross-sectional view of the ECU shown in FIG. In this example, instead of drawing the harness into the case 18, the coupler 34 is integrally provided on the side surface of the case 18. The coupler 34 is one of a plug and a socket, and the other is connected to any one of a plug and a socket constituting another coupler (not shown). In FIG. 9, a plurality of terminals (for example, plug terminals) 36 provided in the coupler 34 are connected to the electrode 16 by conducting wires 37. The circuit board 5 is supported in a floating state with a space (air layer) A in the case 18 by three protruding portions 22.

  In the present embodiment, an example is shown in which the protrusions 12 and 22 are formed of rubber as an elastic material. However, the elastic material is not limited to rubber, and for example, a cylindrical coil instead of the columnar protrusion 12 is used. A spring may be used. Further, the protruding portion 12 may be a metal wire such as a piano wire, and the plate-like protruding portion 22 may be a stainless steel thin plate.

  FIG. 10 is a cross-sectional view of the main part of the circuit board showing an example in which a coil spring is used as the protruding portion 12. In this example, one end of a coil spring as the projecting portion 12 is coupled to the side surface of the circuit board 5, and the other end is fitted into the support recess 181 of the case 18.

  FIG. 13 is a cross-sectional view of the main part showing the throttle device 10 having an ECU including the circuit board 5. In FIG. 13, a throttle device 10 incorporating a circuit board 5 includes a throttle body 38, a throttle valve 14 that is incorporated in the throttle body 38 and pivotally supported in an intake passage 59, and a throttle valve. ECU 30 for controlling the fuel injection amount based on the opening degree of the valve 14 and the like. The shaft of the throttle valve 14 (throttle shaft: indicated by the axis 140) extends rightward in FIG. 11, and a wire pulley 142 to which the throttle wire 141 is locked is attached to the end of the throttle shaft.

  The ECU 30 includes a circuit board 5, a case 18 that accommodates the circuit board 5 and is coupled to the throttle body 38, and an ECU cover 39 that engages with an end of the case 18 and covers the circuit board 5. Between the circuit board 5 and the throttle body 38, an actuator (for example, a motor) 41 for driving a throttle sensor 40 and an idle adjustment valve (not shown) is provided. The case 18 is formed in a substantially rectangular shape suitable for accommodating the substantially rectangular parallelepiped circuit board 5, that is, the shape viewed from the left side of FIG.

  The ECU cover 39 is a cover that covers the end of the case 18 that is substantially rectangular, accommodates a plurality of signal wires (or conductors) 29a constituting the harness 29, and electrically connects the conductors 29a to the circuit board 16a. Function as a coupler or connector. The ECU cover 39 is preferably a flexible material such as resin or rubber.

  The ECU cover 39 is provided with a guide hole 39a for accommodating the terminal 36 and the leading end portion of the conducting wire 29a. The guide holes 39a are formed in a number corresponding to the number of the conductive wires 29a to be used, and extend with an angle θ in a diagonally downward direction with respect to the surface 43 of the circuit board 5. A rubber bush 61 is placed around the conductive wire 29a, and the periphery of the rubber bush 61 is brought into contact with the inner peripheral surface of the guide hole 39a to provide waterproofness.

  The circuit board 5 is a so-called double-sided mounting board on which electronic components and elements such as capacitors are mounted on both the first surface (front surface) 42 and the second surface (back surface) 43. The front surface 42 and the back surface 43 of the circuit board 5 are each provided with a plurality of electrodes 16a and 16b. Each electrode 16a, 16b is connected to a component provided on the board body and is connected to the outside. The plurality of electrodes 16a provided on the surface 42 of the circuit board 5 are in contact with the terminals 36 provided on the respective conductive wires 29a focused on the ECU cover 39, and are electrically connected to each other. A plurality of electrodes 16b provided on the back surface 43 of the circuit board 5 are brought into contact with terminals 44 provided on the throttle sensor 40 and terminals 46 and 47 provided on the actuator 41 to electrically connect each other. For simplicity, the conductive wire 29a, the terminal 36, and the electrode 16a are provided with reference numerals only for one set in the figure.

  The projecting portion 12 is fixed to the end surface (upper surface and lower surface in FIG. 11) 5S of the circuit board 5, and the case 18 has a support recess (see the support recess 181 in FIG. 2) that supports the tip of the projecting portion 12 on the inner surface side. ), And the tip end portion of the projecting portion 12 is inserted into the support concave portion.

  Furthermore, protrusions (bosses or ribs) 12a and 12b can also be provided on the back surface 43 of the circuit board 5. The protrusion 12a engages with the peripheral wall 41b of the recess 41a that accommodates the terminals 46 and 47 of the actuator 41, and the protrusion 12b is the peripheral wall 40b of the recess 40a that accommodates the terminal 44 of the throttle sensor 40. Engage with. The protrusion 12 may be a columnar or plate-like rubber as described with reference to FIGS. 1 to 9, or may be a coil spring, a piano wire, or a thin plate described with reference to FIG. 10.

  There is a possibility that the terminals 44, 46 and 47 coming out of the throttle sensor 40 and the actuator 41 and the electrode 16 b formed on the back surface 43 of the circuit board 5 rub against each other to cause wear. However, by providing the projecting portions 12a and 12b as in this embodiment, the vertical relative positions of the throttle sensor 40 and the actuator 41 and the substrate 5 are fixed, and the terminals 44, 46 and 47 and the electrode 16b are caused by vibration. Rubbing movement is suppressed.

  The outer surface of the circuit board 16a including the front surface 42, the back surface 43, and the end surface 5S is molded by a resin material except for the portions where the electrodes 16a and 16b and the protruding portions 12, 12a, and 12b are provided. That is, the electrodes 16a and 16b and the projecting portions 12, 12a, and 12b are not covered with the resin material and are exposed on the front surface 42, the back surface 43, and the end surface 5S side of the circuit board 5. As a resin molding method, it is preferable to use a pressure molding method (transfer mold molding) in which a heated and pressurized resin is injected into a heating mold.

  A sheet-like seal 48 is provided between the ECU cover 39 and the circuit board 5. The seal 48 can be adhered and fixed to the ECU cover 39. The seal 48 is made of a highly elastic material such as rubber, and is provided with holes corresponding to the number of the terminals 36 so that the terminals 36 can pass through and be in contact with the electrodes 16 a exposed on the surface 42.

  Engagement protrusions 50 are formed on the upper and lower walls of the case 18, respectively, and engagement holes 52 into which the engagement protrusions 50 of the case 18 are fitted are formed on the ECU cover 39 side. A cover member 391 is preferably attached to the engagement hole 52 from the outside. A stay 185 extending in parallel with the upper side portion 186 is provided on the inner side (that is, closer to the circuit board 5) than the upper side portion 186 (wall portion) of the case 18 where the engaging protrusions 50 are formed.

  The ECU cover 39 is provided with a first rib 392 extending toward the case 18 side. The rib 392 is a plate-like member that extends in parallel with the upper end surface of the circuit board 5 and expands in the extending direction of the intake passage 59, passes through the sheet-like seal 48, the upper side portion 186 of the case 18, the stay 185, It is fitted between.

  The engine vibration is directly transmitted to the throttle body integrated ECU. Since the throttle body 38, the throttle sensor 40, the actuator 41, and the circuit board 5 have different weights and have different mounting or support structures, the throttle body 38, the throttle sensor 40, the actuator 41, and the circuit board 5 have their own movements due to the transmitted vibration.

  As a result, for example, in the configuration shown in FIG. 11, when the circuit board 5 a vibrates up and down, the stay 185 tends to open (try to bend upward), so that the circuit board 5 and the ECU cover 39 are relative to each other. The electrode 16a formed on the surface 42 side of the circuit board 5 and the terminal 36 may rub against each other and cause wear.

  However, according to this embodiment, after the ECU cover 39 is attached to the case 18, there is no room for the stay 185 to bend upward by the rib 392, so that the terminal 36 and the electrode 16 a exposed at the surface 42 can be removed. Can be prevented from shifting due to vibration.

  According to the ECUs of the above-described embodiments, the circuit board 5 has a primary waterproof effect by the case 18 and further has a waterproof effect by the resin mold. Furthermore, since the circuit board 5 is floated by the protrusions 12 and 22 made of an elastic material interposed between the end face 5S of the circuit board 5 and the case 18, vibration from the outside is given to the case 18. Even when this occurs, the vibration is greatly attenuated and transmitted to the circuit board 5. Since the vibration transmitted to the circuit board 5 is greatly attenuated, the ECU 30 can be disposed in the vicinity of the engine E having a large mechanical vibration, so that the degree of freedom in layout increases. For example, since components such as an ignition device and a throttle device for engine control are arranged in the vicinity of the engine E, the wiring distance between the ECU 30 and each engine control component is shortened.

  DESCRIPTION OF SYMBOLS 5 ... Circuit board, 12 ... Projection part, 18 ... Case, 14 ... Throttle valve, 16 ... Electrode, 22 ... Plate-like projection part, 28 ... Mold, 29 ... Harness, 30 ... ECU, 32 ... Harness through-hole, 33 ... Seal, 34 ... Coupler, 181, 182 ... Support recess

Claims (15)

An external connection electrode (16) is exposed on the surface, and a circuit board (5) is formed in a substantially rectangular parallelepiped shape by resin molding on the entire surface except the electrode (16), and the circuit board ( 5) In the engine control device (30) comprising the case (18) for housing
The circuit board (5) is accommodated with a space (A) so as not to contact the case (18),
An elastic member (12, 22) formed to project outward from the end face (5S) of the circuit board (5);
An engine control device, wherein an end of the elastic member (12, 22) is supported by an inner wall surface of the case (18).   2. The engine control device according to claim 1, wherein end portions of the elastic members are fitted into support recesses formed on an inner wall surface of the case. . In the case (18), a harness through hole (32) formed so as to penetrate the inside and outside of the case is formed,
The seal (33) is provided between the harness through hole (32) and the harness (29) routed through the harness through hole (32). Engine control device. The electrode (16) is an electrode to which the harness (29) is connected;
The resin mold (28) is applied to a portion of the surface of the circuit board (5) excluding a portion where the electrode (16) is provided and a portion where the elastic member (12, 22) is formed. The engine control apparatus according to claim 1, wherein the engine control apparatus is provided.   An external connection coupler (34) is attached to one side of the case (18), and is extended from the coupler (34) and connected to an external connection electrode (16) provided on the circuit board (5). The engine control device according to claim 1 or 2, wherein a conducting wire (37) is provided. The case (18) includes a case body (183) and a lid (184) covering the case body (183),
The engine control device according to any one of claims 1 to 5, wherein the elastic member (12, 22) is sandwiched by a joining portion of the case main body (183) and the lid (184).   The engine control device according to any one of claims 1 to 6, wherein the elastic member (12) is columnar.   The engine control device according to any one of claims 1 to 6, wherein the elastic member (22) has a plate shape.   The engine control device according to any one of claims 1 to 8, wherein the elastic members (12, 22) are made of rubber.   The engine control device according to claim 1, wherein the elastic member is a coil spring. The case (18) for accommodating the circuit board (5) is an ECU case attached to the throttle body (38) of the engine,
The engine control device according to any one of claims 1 to 10, wherein the circuit board (5) is supported in a floating state in the case (18) by the elastic member (12). The circuit board (5) has the electrodes (16a, 16b) on the first surface (42) and the second surface (43) orthogonal to the end surface (5S), respectively.
Protruding portions (12a, 12b) that engage with the case (18) and restrict movement of the case (18) in a direction perpendicular to the end surface (5S) are provided. The engine control device according to claim 11. An ECU cover (39) having a rib (392) covering the end surface of the case (18) and extending toward the case (18);
The rib (392) is fitted into a gap formed between a wall portion (186) provided in the case (18) and a stay (185) extending in parallel to the wall portion (186). The engine control device according to claim 12, wherein the engine control device is configured to do so.   The engine control device according to claim 11, wherein the resin mold (28) is further applied except for the protrusions (12a, 12b).   The engine control device according to any one of claims 1 to 14, wherein the engine control device is mounted on a motorcycle and applied to a driving engine of the motorcycle.

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