JP2012072692A - Engine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throttle body-mounting type ECU capable of improving the water proof property, vibration proof property and productivity while achieving miniaturization.SOLUTION: An ECU 16 is mounted on a throttle body 12 via an ECU case 20. The case 20 stores a circuit board 16a with a resin coating applied, a sensor 40 and an actuator 41 disposed between the circuit board 16a and the throttle body 12. The case 20 is covered with an ECU cover 22 for supporting external connection terminals 30 connected with a plurality of lead lines 29. A rubber sheet-like sealing 42 is disposed between the cover 22 and the circuit board 16a. The circuit board 16a has an electrode 45 and the like disposed at a position facing a connection terminal 44 of the sensor 40 and the like on one surface 24, and a plurality of electrodes for external connection 32 disposed facing the external connection terminals 30 on the other surface 26.

Description

  The present invention relates to an engine control device, and more particularly to an engine control device attached to a throttle body.

  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.

  2. Description of the Related Art Conventionally, in a structure in which an ECU is mounted around a throttle body, a circuit board, a throttle opening sensor, a throttle valve actuator, and the like are housed in an ECU case and resin potting is performed in the case (see Patent Document 1). ).

JP 2004-285898 A

  When element parts such as ECUs, throttle opening sensors, and actuators are arranged around the throttle body, the assembly in which the throttle body and the element parts are integrated becomes larger, so the degree of freedom in layout becomes smaller when mounted on the vehicle. It is possible. Therefore, although it is desired to reduce the size of the ECU, it is not easy to reduce the size of the ECU by the method of potting the sensor together with the circuit board.

  In addition, simply attaching the component parts to the throttle body simply causes complicated wiring between the component parts, and increases the number of couplers for connection (that is, the number of parts). Therefore, the configuration in which the component parts are arranged around the throttle body may be particularly not suitable for a motorcycle or the like in which the space is extremely limited and the usage environment is severe. Accordingly, there is a need for a throttle body integrated ECU that improves these difficult situations, is more compact and waterproof, and does not include a coupler in the ECU case, and is suitable for motorcycles and the like.

  In view of the above problems, an object of the present invention is to provide a throttle body-integrated ECU that is more compact and has a high waterproof property without using potting in an ECU case containing a substrate, a sensor, and the like.

  To achieve the above object, the present invention provides an engine control device attached to a side portion of a throttle body, an ECU case coupled to the throttle body, and a circuit housed in the ECU case and coated with a resin coating on the surface A board, an intake system sensor that is liquid-tightly accommodated in the ECU case, and is attached to the throttle body between the circuit board and the throttle body, and the ECU case is opposite to the attachment surface to the throttle body An ECU cover that covers from the side and holds external connection terminals connected to a plurality of conductors, and a sheet-like seal interposed between the ECU cover and the circuit board, the circuit board on one surface , Having a sensor electrode disposed at a position facing the connection terminal of the intake system sensors, on the other surface, Disposed Kigaibu opposite to the connection terminal position, there is a first feature in that it has the external connection terminals electrically plurality of external connection electrodes in contact.

  In the present invention, the main surface of the circuit board is substantially rectangular, and the ECU case is opposite to the upper and lower edges of the main surface opposite to the mounting surface of the ECU case to the throttle body. There is a second feature in that a claw portion to be engaged is provided.

  In addition, the present invention has a third feature in that a claw portion that engages with an upper edge of the circuit board is formed at a tip of a stay provided inside the ECU case.

  In addition, the present invention has a fourth feature in that it has a rib protruding from the ECU cover and fitted between the upper side portion of the ECU case and the stay.

  In addition, the present invention is a boss projecting from the one surface of the circuit board, of the plurality of electrical components, the connection of electrical components that are close to the side where the stay is provided in the vertical direction A fifth feature is that a boss that engages a wall of a terminal groove in which the terminal is disposed is provided.

  Further, according to the present invention, the ECU case has four case wall portions along the shape of the main surface of the circuit board, and the ECU cover is opposed to the two of the wall portions of the ECU case. A cover wall portion extending along the outer surface of the two wall portions, the opposing surface of the case wall portion and the cover wall portion is formed on one of the opposing surfaces, and the convex portion formed on the other A sixth feature is that it has a recessed portion to be engaged.

  Further, the present invention extends between the throttle body and the throttle body, one end is pivotally supported by the throttle body, and the other end is bent toward the surface side of the ECU cover that covers the ECU case. There is a seventh feature in that an ECU clamp comprising a pair of levers having a shape engaged with the surface of the ECU cover is provided.

  Also, the present invention provides a bent portion so that the connection terminal of the electrical component and the external connection terminal can be contacted with elasticity when pressed against the component electrode and the external connection electrode. The eighth feature is that it is formed.

  Further, according to the present invention, the ECU cover has a plurality of guide holes for individually holding the plurality of conductive wires and the plurality of external connection terminals, and the guide holes are inclined with respect to the other surface of the circuit board. There is a ninth feature in that it extends in the direction, and there is a tenth feature in that it has a rubber bush interposed between the guide hole and the conducting wire.

  In addition, the present invention has an eleventh feature in that the sheet means is a rubber sheet-like seal and has a through hole of the external connection terminal.

  According to the present invention having the first feature, it is possible to realize a light-weight, inexpensive, and compact device by using a resin-coated substrate without potting the substrate on the ECU case. In addition, it is possible to directly contact the electrode formed on one surface of the circuit board by assembling the intake system sensors in a liquid-tight manner to the ECU case on one side of the resin-coated circuit board. Become. Further, an ECU cover is put on the ECU case assembled with the circuit board through sealing means facing the circuit board. Since the ECU cover accommodates the external connection terminal, the external connection terminal can be brought into direct contact with the electrode provided on the other surface of the circuit board by covering the ECU case with the ECU cover. By providing the sealing means, a waterproof effect can be obtained.

  Since the external connection terminal that contacts the external connection terminal is provided on one surface of the circuit board and the electrical component terminal that contacts the terminal is provided on the other surface, the external connection terminal and the circuit board, and the electrical component and circuit board are provided. Since the wiring between them becomes unnecessary, the ECU can be downsized. In addition, it becomes possible to manage dimensions on each of the one side and the other side of the circuit board, thereby improving productivity.

  In addition, according to the present invention having the second and third features, the circuit board assembled with the electrical components can be easily temporarily fixed to the ECU case using the claw portion, so that it is easy to assemble even in a vehicle-mounted state. And it also reduces man-hours.

  Further, according to the present invention having the fourth feature, when the circuit board is fitted into the ECU case, the stay can be widened by expanding the stay, so that the circuit board can be easily fitted into the ECU case. On the other hand, after the ECU cover is attached to the ECU case, there is no room for the stay to bend upward by the rib, so that the relative position between the terminal and the external connection electrode can be prevented from being displaced by vibration.

  Further, according to the present invention having the fifth feature, since the wall forming the terminal groove of the electrical component is sandwiched between the boss and the ECU case, the vertical relative position between the electrical component and the circuit board is The movement of friction between the terminals of the electrical component and the electrodes provided on the circuit board due to vibration is suppressed.

  Thus, according to the present invention having the fourth and fifth features, it is possible to prevent the terminals and the electrodes from frequently rubbing and wearing due to fluctuations in relative positions caused by vibrations caused by engine operation. Can do.

  Further, according to the present invention having the sixth feature, the ECU cover can be fixed to the ECU case by covering the ECU case with the ECU case and engaging the concave and convex portions.

  Further, according to the present invention having the seventh feature, the seat seal and the ECU cover are fixed to the ECU case using the ECU clamp in a state where the ECU case assembled with the circuit board and the electrical parts is fixed to the throttle body. It is easy to assemble.

  In addition, according to the present invention having the eighth feature, since the terminal is bent, elasticity can be imparted to the terminal itself, so that the contact between the electrode and the terminal is improved. In addition, it is possible to absorb dimensional tolerances by stacking each part.

  Further, according to the present invention having the ninth feature, since the conducting wire held by the ECU cover extends obliquely, the height of the projecting portion from the ECU can be lowered, and the layout can be reduced. The degree of freedom increases. In addition, according to the tenth feature, waterproofness can be further improved.

  Furthermore, according to the present invention having the eleventh feature, since the sheet means is a rubber sheet-like seal having elasticity, the dimensional tolerance for each part can be increased by utilizing the repulsive force of rubber. A more reliable electrical contact between the terminal and the electrode can be obtained, and the waterproof effect can be improved.

It is principal part sectional drawing of the throttle apparatus which attached ECU which concerns on 1st Embodiment of this invention. It is an exploded view of ECU which concerns on 1st Embodiment of this invention. It is principal part sectional drawing of the throttle apparatus which attached ECU which concerns on 2nd Embodiment of this invention. It is principal part sectional drawing of the throttle apparatus which attached ECU which concerns on 3rd Embodiment of this invention. 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 a principal part enlarged view of FIG. It is principal part sectional drawing which shows the modification of the throttle apparatus which attached ECU.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 5 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. 6 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.

  An ECU integrated throttle device 10 is connected to the upper side wall of the cylinder head 11 of the engine E via an intake pipe. A fuel injection valve 27 (see FIG. 6) 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.

  The throttle device 10 is rotatably supported by a butterfly throttle valve (which will be described later with reference to FIG. 1) for adjusting the amount of air supplied to the engine E, and a throttle wire is connected to a pulley 142 arranged continuously to the throttle valve. 141 is wound.

  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 partial cross-sectional view showing a main part of a throttle device incorporating an ECU according to an embodiment of the present invention. In the description of FIG. 1, the directions such as “up” and “down” are those in FIG. The throttle device 10 is a fuel injection system based on a throttle body 12, a throttle valve 14 incorporated in the throttle body 12 and pivotally supported in an intake passage 59, and an opening degree of the throttle valve 14. ECU16 which controls quantity. The shaft of the throttle valve 14 (throttle shaft: indicated by the axis 140) extends rightward in FIG. 1, and a wire pulley 142 to which the throttle wire 141 is locked is attached to the end of the throttle shaft.

  The ECU 16 accommodates the circuit board 16 a, the ECU case (hereinafter simply referred to as “case”) 20 that houses the circuit board 16 a and is coupled to the throttle body 12, and the end of the case 20. And an ECU cover 22 for covering. The circuit board 16a is disposed such that its main surface (a first surface 24 and a second surface 26 described later) is along the extending direction of the intake passage 59 in which the throttle valve 14 is disposed.

  Between the circuit board 16a and the throttle body 12, an actuator (for example, a motor) 41 that drives a throttle sensor 40 and an idle adjustment valve (not shown) is provided. A seal (oring) 54a is interposed between the convex portion 40a of the throttle sensor 40 and the case 20 into which the convex portion 40a is fitted. Further, in order to accommodate an extension (described later) of a shaft (represented by an axis 141) of the throttle valve 14 connected to the convex portion 40a, the casing 20 is held by the boss 43 formed on the throttle body 12, An O-ring 54 b is interposed between 20 and the boss 43.

  On the other hand, the actuator 41 has a flange F. One side surface of the flange F is in contact with the case 20 via an O-ring 54c, and the other side surface of the flange F is on the throttle body 12 side via an O-ring 54d. Is in contact with the member.

  The circuit board 16a has electronic components such as capacitors and elements on both the surface (first surface) 24 near the throttle body 12 and the surface (second surface) 26 opposite to the first surface 24, respectively. This is a so-called double-sided mounting board for mounting the board.

  The first surface 24 of the circuit board 16a is provided with a sensor electrode 45 for electrically connecting the terminal 44 provided in the throttle sensor 40a and the circuit board 16a. Further, actuator electrodes 48 and 49 for electrically connecting terminals 46 and 47 provided on the actuator 41 and the circuit board 16a are provided on the first surface 24. Two sensor electrodes 45, two actuator electrodes 48, and two terminals 44 and 47 (that is, one pair each) are provided.

  The ECU cover 22 is a cover that covers the end portion of the case 20, and accommodates an assembly (that is, a harness) of a plurality of signal wires (or conductors) 29 and electrically connects the harness to the circuit board 16a. It has a function as a connector. The ECU cover 22 is preferably a flexible material such as resin or rubber. The ECU cover 22 is provided with a guide hole 36 that accommodates the terminal 30 and the distal end portion of the signal line 29. The guide holes 36 are formed in a number corresponding to the number of signal lines 29 scheduled to be used, and extend with an angle θ in a downward oblique direction with respect to the second surface 26 of the circuit board 16a. A rubber bush 61 is placed around the signal line 29, and the periphery of the rubber bush 61 is brought into contact with the inner peripheral surface of the guide hole 36 to provide waterproofness.

  On the second surface (front surface) 26 of the circuit board 16a, a plurality of external connection electrodes 32 are provided for electrically connecting the terminals 30 provided on the signal lines 29 focused on the coupler 22, respectively. . For the sake of simplicity, the conductive wire 29, the terminal 30, and the external connection electrode 32 are provided with reference numerals for only one set in the figure.

  The outer surface 16S of the circuit board 16a including the first surface 24 and the second surface 26 is molded with a resin material except for portions where the sensor electrodes 45, the actuator electrodes 48 and 49, and the external connection electrodes 32 are provided. Is done. That is, the sensor electrode 45, the actuator electrodes 48 and 49, and the external connection electrode 32 are not covered with the resin material and are exposed on the first surface 24 and the second surface 26 side of the substrate 16a. As a resin coating method, it is preferable to use a pressure molding method (transfer mold molding) in which a heat-pressed resin is injected into a heating mold.

  A sheet-like seal 42 is provided as a sealing means between the ECU cover 22 and the circuit board 16a. The seal 42 is made of a highly elastic material such as rubber, and is provided with holes corresponding to the number of the terminals 30 so that the terminals 30 can pass through and come into contact with the external connection electrodes 32.

  The stay 201 of the case 20 extending along the end surface of the circuit board 16a has a claw portion 202 bent toward the second surface 26 side of the circuit board 16a on the ECU cover 22 side. The circuit board 16a is locked at a predetermined position by engaging with the corners on the second surface 26 side of the board 16a. Further, the claw portion 203 is also provided on the edge of the case 20 having a rectangular frontage shape on the side opposite to the edge on which the stay 201 is provided. The circuit board 16 a is held at a predetermined position in the case 20 by the claw portions 202 and 203.

  Engagement protrusions 50 are formed on the upper and lower walls of the case 20, respectively, and engagement holes 52 into which the engagement protrusions 50 of the case 20 are fitted are formed on the ECU cover 22 side. A cover member 221 is preferably attached to the engagement hole 52 from the outside. Instead of the engagement hole 52 penetrating the wall of the ECU cover 22, an engagement recess having a shape in which the engagement protrusion 50 fits may be provided on the inner peripheral surface of the ECU cover 22.

  FIG. 2 is an exploded view of a throttle device incorporating an ECU. With reference to this exploded view, an example of the assembly order of the throttle device will be described. First, the O-ring 54 a is fitted on the outer periphery of the convex portion 40 a of the throttle sensor 40, and the convex portion 40 a of the throttle sensor 49 is fitted into the sensor holding hole 204 provided in the case 20. As a result, the throttle sensor 40 is temporarily fixed to the case 20.

  Next, the circuit board 16 a is fitted into the case 20. At this time, the stay 201 of the case 20 is expanded to secure a front opening for fitting the circuit board 16 a into the case 20. If the circuit board 16a is fitted into the case 20, the stay 201 is restored to its original state by the elasticity of the resin material, and the claw 202 is engaged with the upper part of the circuit board 16a on the second surface 26 side. 203 is engaged with the lower part on the second surface 26 side of the circuit board 16a, and the circuit board 16a is secured in a predetermined position.

  Next, the actuator 41 is fitted into the actuator holding hole 205 provided in the case 20 from the back side of the case 20 (the side opposite to the side into which the circuit board 16a is fitted). At this time, the O-ring 54c is interposed between the flange F and the case 20, and another O-ring 54d is attached to the opposite side of the flange F from the side where the O-ring 54c is located. Further, the O-ring 54 b is fitted into the boss 43 protruding from the throttle body 12.

  Next, the ECU 16 as an assembly in which the circuit board 16a, the throttle sensor 40, and the actuator 41 are arranged in the case 20 is mounted on the throttle body 12. The throttle body 12 has bosses 80 and 81 projecting therefrom, and screw holes 80a and 81a are formed in the bosses 80 and 81, respectively. On the other hand, ribs 83 and 84 protrude from the case 20, and holes 83 a and 84 a through which the set screws 51 and 53 can be passed are provided in the ribs 83 and 84. The screw hole 80a is aligned with the hole 83a, and the screw hole 81a is aligned with the hole 84a. Therefore, the set screw 51 is screwed into the screw hole 80a through the hole 83a, and the set screw 53 is screwed into the screw hole 81a through the hole 84a. Thus, by fixing the case 20 to the throttle body 12, the terminals 46 and 47 of the actuator 41 are brought into contact with the electrodes 48 and 49c, respectively, with the contact force obtained by the elasticity that they have. Similarly, the throttle sensor 40 and the terminal 44 are in contact with the sensor electrode 45.

  The shaft extension 143 of the throttle valve 14 rotatably supported by the boss 43 formed on the throttle body 12 engages with a rotation shaft (not shown) of the potentiometer constituting the throttle sensor 40 at the tip thereof. Similarly, the actuator 41 engages with an idle adjustment valve (not shown) in the throttle body 12.

  Thus, the seat seal 42 is set on the ECU 16 assembled to the throttle body 12 and the ECU cover 22 is put on. First, the sheet-like seal 42 is applied to the first surface 26 of the circuit board 16a, and the ECU cover 22 is placed on the outer peripheral surface of the case 20 from above, and the engaging protrusions 50 formed on the outer wall side surface of the case 20 are Push it in until it fits into the engagement hole 52 on the ECU cover 22 side. As a result, the tip of the terminal 30 provided on the signal line 29 is brought into contact with the external connection electrode 32, and the terminal 30 comes into contact with the electrode 32 with the contact force obtained by the elasticity that they have.

  In the above assembly order, the case 20 is attached to the throttle body 12 before the ECU cover 22 is attached to the case 20, but this order is an example, and another attachment order may be used. For example, the ECU cover 22 may be attached to the case 20 to form a subassembly, and this subassembly may be attached to the throttle body 12.

  Alternatively, after the case 20 is attached to the throttle body 12, the circuit board 16 a may be temporarily fixed to the case 20 and then the ECU cover 22 may be attached to the case 20.

  According to this embodiment, the circuit board 16a can be temporarily fixed in the case 20 without being screwed. For example, the circuit board 16a is attached to the case 20 in an on-vehicle state attached to the throttle body 12. Even in the case of attachment, the circuit board 16a can be easily assembled to the case 20 regardless of the on-vehicle posture of the throttle body 12.

  The position of the circuit board 16a in the case 20 is defined by the claw part 202 formed on the stay 201 of the case 20 and the claw part 203 formed on the case 20, and the claw parts 202 and 203 and the circuit board are arranged. No seal is provided between the second surface 26 of 16a. That is, since the sheet-like seal 42 does not affect the force with which the claw portions 202 and 203 hold the circuit board 16a, the strength and shape of the claw portions 202 and 203 are determined regardless of the elasticity of the sheet-like seal 42. be able to.

  Further, according to this embodiment, each element part (actuator 41, throttle sensor 40, circuit board 16a, sheet-like seal 42, ECU cover 22, etc.) can be assembled to the case 20 in a stacked manner. Good assembly workability can be obtained.

  Next, a second embodiment of the present invention will be described. FIG. 3 is a partial cross-sectional view showing a main part of a throttle device incorporating an ECU according to the second embodiment, and the same reference numerals as those in FIG. 1 denote the same or equivalent parts. In the description related to FIG. 3, directions such as “up” and “down” are those in FIG. 3. In the second embodiment, the shape of the engaging portion between the case 20 and the circuit board 16a and the shape of the sheet-like seal 42 are different from those in the first embodiment (FIG. 1). Unlike the case 20 shown in FIG. 1, the case 20 does not include the stay 201. Therefore, a claw portion 202 that engages with an upper portion of the circuit board 16 a on the second surface 26 side is provided at the upper end portion of the case 20. Further, the claw portion 203 that engages with the lower portion on the second surface side of the case 20 is provided at the lower end portion of the case 20 as in the case of FIG.

  The end portion of the case 20 (the end portion of the portion where the claw portion 202 is formed) abuts on a surface parallel to the second surface 26 of the circuit board 16 a among the inner surface of the ECU cover 22. Further, an engagement protrusion 50 is formed on each of the upper wall and the lower wall of the case 20, and an engagement hole 52 into which the engagement protrusion 50 of the case 20 is fitted is formed on the ECU cover 22 side. A cover member 221 is preferably attached to the engagement hole 52 from the outside. Instead of the engagement hole 52 penetrating the wall of the ECU cover 22, an engagement recess having a shape in which the engagement protrusion 50 fits may be provided on the inner peripheral surface of the ECU cover 22.

  Next, a third embodiment of the present invention will be described. FIG. 4 is a partial cross-sectional view showing a main part of a throttle device incorporating an ECU according to the third embodiment, and the same reference numerals as those in FIG. 1 denote the same or equivalent parts. In the description of FIG. 4, directions such as “up” and “down” are those in FIG. 4. In the third embodiment, the end portion of the case 20, that is, the end portion close to the ECU cover 22, is a claw portion that engages with the second surface 26 side of the circuit board 16 a (the claw portion 202 in FIGS. 1 and 3). 203) is not provided. And the 2nd surface 26 of the circuit board 16a and the end surface of the case 20 contact | abut to the surface parallel to the 2nd surface 26 of the circuit board 16a among the inner surfaces of the ECU cover 22 via the sheet-like seal | sticker 42.

  In the third embodiment, instead of not having the claw portions 202 and 203, the electrodes 32, 45, 48, and 49 of the circuit board 16a and the terminals 30 are used by using the clamp mechanism in a state where the ECU cover 22 is put on the case 20. , 44, 46, and 47 are maintained in a desired state. In FIG. 4, the clamping mechanism is realized as an upper lever 55 that extends from the upper portion of the throttle body 12 to the surface of the ECU cover 22 and a lower lever 56 that extends from the lower portion of the throttle body 12 to the surface of the ECU cover 22. .

  The upper lever 55 includes a base portion 55a, a horizontal portion 55b, and a vertical portion 55c bent downward from the horizontal portion 55b. The vertical portion 55 c has an arc portion that contacts the surface of the ECU cover 22. Similarly, the lower lever 56 includes a base portion 56a, a horizontal portion 56b, and a vertical portion 56c bent upward from the horizontal portion 56b. The vertical portion 56 c has an arc portion that contacts the surface of the ECU cover 22.

  The upper lever 55 is rotatably supported by a pivot 57 provided at the upper portion of the throttle body 12, and the lower lever 56 is rotatably supported by a pivot 58 provided at the lower portion of the throttle body 12.

  With this configuration, the upper lever 55 is opened clockwise from the position shown in FIG. 4, and the lower lever 56 is opened counterclockwise from the position shown in FIG. The ECU 16 including the seal 42 and the ECU cover 22 is assembled to the throttle body 12. Thereafter, the upper lever 55 and the lower lever 56 are rotated to the positions where the arc portions of the vertical portions 55c and 56c abut against the surface of the ECU cover 22, that is, the positions shown in FIG.

  The dimensions of the upper lever 55 and the lower lever 56 are such that the sheet-like seal 42 is pressed against the end of the case 20 and the second surface 26 of the circuit board 16a in a state in which they are rotated to the positions shown in FIG. To be compressed. By selecting the upper lever 55 and the lower lever 56 from elastic materials such as metal wires, sheets (thin plates), resin, hard rubber, etc., the dimensional tolerance of the upper lever 55 and the lower lever 56 is also set large. can do.

  According to each of the embodiments described above, a throttle body integrated ECU that is compact and has good assemblability when mounted can be realized. However, this throttle body integrated ECU has further problems to be solved. The engine vibration is directly transmitted to the throttle body integrated ECU. Since the throttle body 12, the throttle sensor 40, the actuator 41, and the board 16a have different weights and have different mounting or support structures, each of them has its own movement due to the transmitted vibration.

  As a result, for example, in the configuration shown in FIG. 1, when the substrate 16a vibrates up and down, the stay 201 on which the claw portion 202 is formed opens (bends upward), so that the substrate 16a and the ECU cover 22 are relatively The external connection electrode 32 formed on the second surface 26 of the substrate 16a and the terminal 30 may rub against each other and cause wear.

  Similarly, terminals 44, 46 and 47 coming out of the throttle sensor 40 and actuator 41, which are electrical components, and the sensor electrode electrical component electrode 45 and the actuator electrode 48 formed on the first surface 24 of the substrate 16a. , 49 may rub against each other and cause wear.

  Therefore, in order to prevent the wear of the terminals and electrodes caused by such vertical movement, the following measures should be taken.

  FIG. 7 is a cross-sectional view of an essential part of a throttle device to which an ECU according to a modification of the first embodiment described with reference to FIG. 1 is attached. In the figure, the same reference numerals as those in FIG. 1 denote the same or equivalent parts. The ECU cover 22 is provided with a first rib 222 extending toward the ECU case 20. The rib 222 is a plate-like member that extends in parallel with the upper end surface of the substrate 16 a and has an extension in the direction in which the intake passage 59 extends. The rib 222 passes through the sheet-like seal 42 and the upper side portion 206 of the ECU case 20 and the stay 201. It is fitted between.

  As a result, when the board 16a is fitted into the ECU case 20, the stay 201 can be pushed upward in the drawing to enlarge the frontage, so that the board 16a can be easily fitted into the ECU case 20 and the ECU cover 22 is attached to the ECU. After the attachment to the case 20, there is no room for the stay 201 to be bent upward by the ribs 222, so that the relative position between the terminal 30 and the electrode 32 can be prevented from shifting due to vibration.

  On the other hand, a protrusion, that is, a boss 16b can be provided in order to suppress a relative position change between the throttle sensor 40 or the actuator 41 and the substrate 16a. The boss 16b is provided so as to protrude from the first surface 24 of the substrate 6a to the actuator 41 side. The actuator 41 has a terminal groove 41 a formed between the first surface 24 of the substrate 16 a and the actuator 41 in order to accommodate the terminals 46 and 47 of the actuator 41. The boss 16b fits in the terminal groove 41a and is positioned so as to contact the upper wall 41b of the terminal groove 41a.

  Thereby, since the upper wall 41b forming the terminal groove 41a is sandwiched between the boss 16b and the ECU case 20, the vertical relative position between the actuator 41 and the board 16a is fixed, and the terminal 46, The movement of rubbing 47 and the electrodes 48 and 49 is suppressed.

  Further, it is advantageous to provide the boss 16b on the actuator 41 side of the throttle sensor 40 and the actuator 41 for the following reason. That is, when assembling the board 16a into the ECU case 20, the board 16a is started to be assembled in an oblique posture with respect to the ECU case 20 so that the lower end side thereof enters the ECU case 20, and then the board 201 is bent while the stay 201 is bent upward. The upper end side of 16 a is pushed into the ECU case 20 and is locked to the claw portion 202. Therefore, if the boss 16b is provided so as to be engaged with the terminal groove of the throttle sensor 40, the boss interferes with the throttle sensor 40 when the lower end portion of the board 16a is put into the ECU case 20 at the start of the assembly. Hateful. On the other hand, when the boss 16b is disposed so as to be engaged with the actuator 41 side, that is, the upper part, when the boss 16b approaches the terminal groove 41a of the actuator 41, the protruding direction of the boss 16b and the terminal groove 41a Since it does not easily interfere with the wall, it is easy to incorporate.

  Although the present invention has been described with reference to a specific embodiment, the present invention is not limited to this embodiment, and those skilled in the art can make modifications or applications without departing from the scope of the claims. .

  DESCRIPTION OF SYMBOLS 10 ... Throttle device, 12 ... Throttle body, 14 ... Throttle valve, 16 ... ECU (electronic device), 16a ... Circuit board, 20 ... ECU case, 22 ... ECU cover, 24 ... First surface, 26 ... Second 29, signal line (conductive wire), 30 ... terminal, 32 ... external connection electrode, 36 ... guide hole, 40 ... throttle sensor, 41 ... actuator, 34 ... recess, 42 ... sheet-like seal, 44, 46, 47 Terminals for electrical parts 45, 48, 49 ... Electrodes for parts 50 ... Convex parts 52 ... Concave parts 55 ... Upper levers 56 ... Lower levers 57, 58 ... Axes 202, 203 ... Claw parts,

Claims (12)

In the engine control device attached to the side of the throttle body (12),
An ECU case (20) coupled to the throttle body (12);
A circuit board (16a) housed in the ECU case (20) and having a resin coating on the surface;
Intake system sensors (40, 41) that are liquid-tightly accommodated in the ECU case (20) and are attached to the throttle body (12) between the circuit board (16a) and the throttle body (12);
An ECU cover (22) for covering the ECU case (20) from the side opposite to the mounting surface to the throttle body (12) and holding external connection terminals (30) connected to a plurality of conductors (29); ,
Sealing means (42) interposed between the ECU cover (22) and the circuit board (16a),
The circuit board (16a) has sensor electrodes (45, 48) disposed on one surface (24) at positions facing the connection terminals (44, 46, 47) of the intake system sensors (40, 41). 49), arranged on the other surface (26) at a position facing the external connection terminal (30), and a plurality of external connection electrodes (electrical contact with the external connection terminal (30)) ( 32) The engine control device characterized by having.   The main surfaces (24, 26) of the circuit board (16a) are substantially rectangular, and the ECU case (20) is arranged on the throttle body (12) at the upper and lower edges of the main surface (24, 26). The engine control device according to claim 1, further comprising a claw portion (202, 203) engaged from a side opposite to a mounting surface of the ECU case (20).   Of the claw portions (202, 203) that engage with the upper and lower edges, a claw portion (202) that engages with the upper edge is formed at the tip of the stay (201) provided inside the ECU case (20). The engine control device according to claim 2, wherein   A rib (222) protruding from the ECU cover (22) and fitted between the upper side portion (206) of the ECU case (20) and the stay (201) is provided. Item 4. The engine control device according to Item 3.   It is a boss protruding from the one surface (24) of the circuit board (16a), and close to the side of the electrical component (40, 41) where the stay (201) is provided in the vertical direction. The engine control according to claim 4, further comprising a boss (16b) that engages with a wall of a terminal groove (41a) in which the connection terminal (46, 47) of the electrical component (41) is disposed. apparatus. The ECU case (20) has four case wall portions along the shape of the main surface of the circuit board (16a),
The ECU cover (22) has a cover wall portion along the outer surface of two opposing wall portions among the wall portions of the ECU case (20),
The facing surface of the case wall portion and the cover wall portion has a convex portion (50) formed on one of the opposing surfaces, and a concave portion (52) formed on the other and engaged with the convex portion (50). The engine control apparatus according to claim 2, further comprising:   An ECU cover that spans between the throttle body (12) and the throttle body (12), has one end pivotally supported by the throttle body (12) and the other end covering the ECU case (20). 2. An ECU clamp comprising a pair of levers (55, 56) bent to the surface side of (22) and engaged with the surface of the ECU cover (22). Engine control device.   The connection terminals (44, 46, 47) and the external connection terminals (30) of the electrical components (40, 41) are pressed against the component electrodes (45, 48, 49) and the external connection electrodes (32). The engine control device according to any one of claims 1 to 7, wherein the engine control device is formed with a bent portion so as to be able to come into contact with elasticity when being applied.   The ECU cover (22) has a plurality of guide holes (36) for individually holding the plurality of conductors (29) and the plurality of external connection terminals (30), and the guide holes (36) The engine control device according to any one of claims 1 to 8, wherein the engine control device extends in an oblique direction with respect to the other surface (26) of the substrate (16a).   The engine control device according to claim 9, further comprising a rubber bush (61) interposed between the guide hole (36) and the conductive wire (29).   The engine control device according to any one of claims 1 to 10, wherein the electrical components are an actuator (41) of an idle adjustment valve and a throttle sensor (40).   The engine according to any one of claims 1 to 11, wherein the sealing means (42) is a rubber sheet-like seal and has a through hole of the external connection terminal (3). Control device.

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