JP4611269B2 - Intake system sensor arrangement structure of internal combustion engine - Google Patents

Description

  The present invention relates to an intake system sensor arrangement structure for an internal combustion engine.

2. Description of the Related Art Conventionally, as a technique related to an intake system sensor arrangement structure for an internal combustion engine, an intake system sensor and an ECU are arranged on one side of a throttle body in which an intake control valve is arranged to form a single intake passage. (For example, refer to Patent Document 1).
JP 2003-74378 A

  The above technique is for an internal combustion engine using a throttle body that forms a single intake passage, that is, a single cylinder internal combustion engine. In the case of an internal combustion engine having a plurality of cylinders, the number of sensors is not limited. Therefore, further consideration was necessary for the arrangement structure of the intake system sensor. In particular, when each sensor is arranged at various locations according to the intake system structure, the arrangement structure of the sensor becomes large due to the handling of the sensor system harness and the handling of the sensing pipes.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to simplify the handling of sensor harnesses, sensing pipes and the like in an internal combustion engine having a plurality of cylinders, and to intake air of a compact internal combustion engine. It is to provide a system sensor arrangement structure.

In order to achieve the above object, an invention according to claim 1 includes a plurality of cylinders, a throttle body corresponding to each of the cylinders and forming a plurality of intake passages in which intake control valves are disposed, and each cylinder An intake system sensor arrangement structure for an internal combustion engine having a fuel supply pipe arranged along the arrangement direction of the engine and an intake system sensor comprising a plurality of sensors for sensing a plurality of parameters relating to intake air, respectively, on the end side of the throttle body is in, is arranged a support member for supporting the fuel supply pipe, with the intake system sensor is fixed to the cylinder arrangement direction outer side surface of the support member, the support member includes a plurality of sensors An opening through which a sensing pipe connecting the intake passage passes is formed .

  According to a second aspect of the invention, in addition to the configuration of the first aspect, the internal combustion engine is a V-type multi-cylinder engine, and the intake system sensor is located between the intake passage on one bank side and the intake passage on the other bank side. It is provided at a position.

  According to a third aspect of the invention, in addition to the configuration of the first or second aspect, the intake system sensor includes a sensor body having a plurality of sensors and formed in an elongated shape, and the sensor body has a longitudinal direction thereof. The support member is attached to the support member in a state where the longitudinal direction of the support member is inclined with respect to each other.

According to the first aspect of the present invention, the intake system sensors including a plurality of sensors are concentrated on the support member that is disposed on the end side of the throttle body in the cylinder arrangement direction and supports the fuel supply pipe. The handling of the sensor system harness can be simplified and a compact arrangement structure is obtained. In addition, since the intake system sensor is fixed to the support member on the end side of the throttle body in the cylinder arrangement direction, the sensor system harness and sensing piping do not cross the throttle body in a complicated manner. The degree of freedom of structure can be improved. Further, since the sensing pipe connecting the sensor and the intake passage is passed through the opening of the support member, the sensing pipe can be shortened. Further, in order to fix the intake system sensor to the outer side surface of the support member in the cylinder arrangement direction and allow the sensing pipe to pass through the opening of the support member on the inner side, the sensor system harness and the sensing pipe arranged from the outside Interference with can be prevented.

  According to the invention of claim 2, the internal combustion engine is a V-type multi-cylinder engine, and the intake system sensor is provided at an intermediate position between the intake passage on one bank side and the intake passage on the other bank side. It is possible to simplify the piping of the sensing pipe toward the intake passage.

  According to the invention of claim 3, since the longitudinal direction of the elongated sensor body is inclined with respect to the longitudinal direction of the support member to be fixed, the amount of protrusion of the sensor body from the support member It is possible to optimize the handling of sensing piping while suppressing the above.

  Hereinafter, an embodiment of an intake system sensor arrangement structure for an internal combustion engine according to the present invention will be described in detail with reference to the drawings.

  First, a schematic configuration of an example of a motorcycle to which the present invention is applied will be described with reference to FIG. In the following description, “front / rear / left / right” means “front / rear / left / right” with reference to a motorcycle.

  In the motorcycle 10, a pair of left and right main frames 12 (only one is shown) extends from the head pipe 11 obliquely downward to the rear of the vehicle body, and a V-type multi-cylinder engine 13, which is an internal combustion engine, is attached to the lower portion of these main frames 12. A swing arm 15 is attached to the rear portion of the main frame 12 via a pivot shaft 14 so as to be able to swing up and down. The upper end of the rear cushion unit 16 is attached to the upper front portion of the swing arm 15 and the rear wheel 17 is attached to the rear end portion of the swing arm 15. The lower end of the rear cushion unit 16 is connected via a link device 18. The main frame 12 is attached to the lower end of the rear part. A seat cowl 19, which also serves as a seat, extends rearward from the upper portion of the main frame 12, and a fuel tank 20 is attached to the inside of the seat cowl 19.

  Exhaust pipes 24 and 25 provided for each cylinder of the V-type multi-cylinder engine 13 extend rearward from the cylinder head 21 on the front side of the engine 13, and these exhaust pipes 24 and 25 are once assembled to form a right muffler on the back side. 26. On the other hand, exhaust pipes 31 and 32 provided for each cylinder extend rearward from the cylinder head 28 on the rear side of the engine 13, and these exhaust pipes 31 and 32 are gathered once to a rear muffler 33 provided at the rear of the vehicle body. It is connected. An intake mechanism 34 provided with the intake system sensor arrangement structure of the present invention is provided between the cylinder heads 21 and 28 of the engine 13.

  Here, reference numeral 41 is a front fork rotatably attached to the head pipe 11, reference numeral 42 is a front wheel attached to the lower end of the front fork 41, reference numeral 43 is a front fender that covers the front wheel 42, reference numeral 44 is an upper cowl, Reference numeral 45 is a middle cowl, reference numeral 46 is a lower cowl, reference numeral 47 is a radiator, reference numeral 48 is a handlebar, and reference numeral 49 is a tank cover.

  The V-type multi-cylinder engine 13 is a DOHC type water-cooled V-type four-cylinder engine that is mounted on the motorcycle 10 in a horizontal arrangement in which the axis of the crankshaft 60 shown in FIG. The V-type multi-cylinder engine 13 includes a cylinder block 63 having a front bank 61 and a rear bank 62 forming a V bank, a crankcase 64 coupled to a lower portion of the cylinder block 63, a front bank 61 and a rear bank 62. The front cylinder head 21 and the rear cylinder head 28 respectively coupled to the upper end portions of the front cylinder head 21, and the front head cover 65 and the rear cylinder head 28 coupled to the upper end portions of the front cylinder head 21 and the rear cylinder head 28, respectively. A head cover 66.

  Two (plural) parallel cylinders 67 (only one shown) constituting the front bank 61 and two (plural) parallel cylinders 68 (only one shown) constituting the rear bank 62 include pistons. 70 are slidably fitted to each other, and a combustion chamber 71 is formed between each piston 70 and each cylinder head 21, 28. Each cylinder head 21, 28 has an intake port 72 having a pair of intake ports that open to the combustion chamber 71 for each of the two cylinders 67 constituting the front bank 61 and for each of the two cylinders 68 constituting the rear bank 62. 73 and exhaust ports 74 and 75 having a pair of exhaust ports that open to the combustion chamber 71 are formed. The pair of intake ports and the pair of exhaust ports are defined by a pair of intake valves 78 and a pair of exhaust valves 79 respectively operated by an intake cam shaft 76 and an exhaust cam shaft 77 that are rotationally driven by the power of the crankshaft 70. It is opened and closed at the timing.

  The intake mechanism 34 disposed between the front bank 61 and the rear bank 62 constituting the V bank corresponds to each of the two cylinders 67 of the front bank 61 and includes two intake control valves 81 disposed therein. Two intake passages corresponding to the front throttle body portion 82 (the front side in FIG. 3) forming the intake passage 83 and the two cylinders 68 of the rear bank 62 and having the intake control valve 81 disposed therein. The throttle body 87 is configured to include a rear throttle body portion 84 (the rear side in FIG. 3) that forms 85 and a connecting portion 86 that connects the front and rear throttle body portions 82 and 84.

  The front and rear throttle body portions 82 and 84 are respectively coupled to the cylinder heads 21 and 28, and the intake passages 83 and 85 communicate with the intake ports 72 and 73 of the cylinder heads 21 and 28, respectively. A first fuel injection valve 89 is provided downstream of the intake control valve 81 in the front and rear throttle body portions 82 and 84. A frame trap 88 made of a wire mesh is mounted on the upper portions of the front and rear throttle body portions 82 and 84, and a second fuel injection valve 90 is disposed above the frame trap 88. The intake control valve 81 provided in each of the throttle body portions 82 and 84 has its opening degree controlled by a throttle control device (not shown). 3 and 4, each frame trap 88 is not shown, and in FIG. 3, the second fuel injection valve that supplies fuel to one of the two intake passages 83 of the front throttle body portion 82. 90 is omitted.

  In the present embodiment, a single fuel supply pipe 94 disposed along the axial direction of the crankshaft 70 is interposed between the front bank 61 and the rear bank 62 constituting the V bank via branch supply pipes 95 and 96. Thus, fuel is supplied to the second fuel injection valves 90 of the two cylinders 67 of the front bank 61 and the two cylinders 68 of the rear bank 62. Further, the fuel in the fuel supply pipe 94 is sent to the fuel pipes 98 and 99 through the connection pipe 97, from which the first fuel injection valves of the two cylinders 67 of the front bank 61 and the two cylinders 68 of the rear bank 62 are provided. To 89.

  The fuel injected from the first fuel injection valve 89 and the second fuel injection valve 90 is mixed with the air sucked into the intake passages 83 and 85 to form an air-fuel mixture. The air-fuel mixture sucked into the combustion chamber 71 through the intake ports 72 and 73 is ignited and burned by the spark plug 100, and the piston 70 that reciprocates due to the generated combustion pressure moves the crankshaft 60 through the connecting rod 101. Rotating drive.

  As shown in FIGS. 3 to 5, the connecting portion 86 of the throttle body 87 has an arrangement direction of the two cylinders 67 of the front bank 61 or an arrangement direction of the two cylinders 68 of the rear bank 71 (hereinafter, A pair of support members 111 and 112 extending upward between the pair of throttle body portions 82 and 84 are attached to both end sides in “cylinder arrangement direction”. A fuel supply pipe 94 is installed between the upper ends. Thus, the fuel supply pipe 94 is arranged along the cylinder arrangement direction. The pair of support members 111 and 112 are located at the intermediate position of the connecting portion 86, that is, the intake passage 83 of the throttle body portion 82 of one front bank 61 and the intake passage of the throttle body portion 84 of the other rear bank 62. It is arranged at an intermediate position of 85. A branch supply pipe 95 connected to the second fuel injection unit 96 is formed in the fuel supply pipe 94 and a communication pipe 97 directed to the first fuel injection valve 89 is connected. Reference numeral 114 denotes a throttle opening sensor that detects the opening of the intake control valve 81.

  In the present embodiment, the intake system sensor 120 configured by integrating a plurality of sensors 115, 116, 117, and 118 shown in FIG. One support member 111 that supports the tube 94 is fixed to the outer side surface 111a in the cylinder arrangement direction. As a result, the intake system sensor 120 fixed to the support member 111 also has an intermediate position of the connecting portion 86, that is, the intake passage 83 of the throttle body portion 82 of one front bank 61 and the throttle body of the other rear bank 62. It is arranged at an intermediate position of the intake passage 85 of the portion 84.

  In the intake system sensor 120, the sensor body 119 has a long shape, and the sensor body 119 is fixed to the support member 111 in a state in which the longitudinal direction of the sensor body 119 and the longitudinal direction of the support member 111 are inclined to each other. A sensor 115 for detecting atmospheric temperature is exposed to the outside as shown in FIG. 3 on the lower end side of the sensor body 119 that protrudes outward from the support member 111 by being inclined in this manner, and the support member 111 and the plate It protrudes so as to overlap in the thickness direction.

  Further, as shown in FIG. 3, three openings 121, 122, and 123 are formed in the support member 111 so as to penetrate through the forming direction with respect to the longitudinal direction of the support member 111, and the sensors 116, 117, Three sensing pipes 126, 127, and 128 connected to 118 respectively pass through these openings 121, 122, and 123, and extend downward between the throttle body parts 82 and 84.

  The sensor 116 detects the pressure in the intake passage 83 of the front bank 61 via the sensing pipe 126, and the sensor 117 detects the pressure in the intake passage 85 of the rear bank 62 via the sensing pipe 127. The sensor 118 detects the atmospheric pressure through the sensing pipe 128 that is open to the atmosphere.

  According to the present embodiment described above, the intake system sensor 120 including the plurality of sensors 115 to 118 on the support member 111 that is disposed on the end side of the throttle body 87 in the cylinder arrangement direction and supports the fuel supply pipe 94. Since these are concentrated, the handling of the sensor system harness can be simplified and a compact arrangement structure is obtained.

  Further, since the intake system sensor 120 is fixed to the support member 111 on the end side of the throttle body 87 in the cylinder arrangement direction, the sensor system harness and the sensing pipes 126 to 128 may cross the throttle body 87 in a complicated manner. Therefore, the degree of freedom of the structure of the throttle body 87 can be improved.

  Further, the internal combustion engine is a V-type multi-cylinder engine 13, and the intake system sensor 120 is provided at an intermediate position between the intake passage 83 on one front bank 61 side and the intake passage 85 on the other rear bank 62 side. It is possible to simplify the handling of the sensing pipes 126 and 127 toward the intake passages 83 and 85.

  Furthermore, since the longitudinal direction of the sensor body 119 formed in an elongated shape is inclined with respect to the longitudinal direction of the support member 111 to be fixed, sensing is performed while suppressing the protrusion amount of the sensor body 119 from the support member 111. The handling of the pipes 126 to 128 can be optimized.

  In addition, the sensing pipes 126 and 127 that connect the sensors 116 and 117 and the intake passages 83 and 85 and the sensing pipes 128 that are connected to the sensor 118 are passed through the openings 121 to 123 of the support member 111. ~ 128 can be shortened. Further, the intake system sensor 120 is fixed to the outer side surface of the support member 111 in the cylinder arrangement direction, and the sensing pipes 126 to 128 are passed through the openings 121 to 123 of the support member 111 on the inner side. Interference between the sensor system harness (not shown) and the sensing pipes 126 to 128 can be prevented.

  In addition, this invention is not limited to the thing of the said embodiment, A change or improvement etc. are possible suitably.

1 is a side view of a motorcycle to which an embodiment of an intake system sensor arrangement structure for an internal combustion engine according to the present invention is applied. It is the side view which made the cross section the principal part which shows the upper part of the internal combustion engine to which the embodiment is applied. It is a perspective view which shows the principal part of the embodiment in a state where a frame trap is omitted and partly cut away. It is a rear view which abbreviate | omits and shows the principal part of the same embodiment. It is a side view which shows the principal part of the embodiment.

Explanation of symbols

61 Front bank 62 Rear bank 67, 68 Cylinder 81 Intake control valve 83, 85 Intake passage 87 Throttle body 94 Fuel supply pipe 111 Support members 115, 116, 117, 118 Sensor 119 Sensor body 120 Intake system sensors 121, 122, 123 Opening 126, 127, 128 Sensing piping

Claims (3)

Multiple cylinders,
A throttle body corresponding to each of the cylinders and forming a plurality of intake passages in which intake control valves are arranged;
A fuel supply pipe disposed along the arrangement direction of the cylinders;
An intake system sensor comprising a plurality of sensors for sensing a plurality of parameters related to intake, respectively;
An intake system sensor arrangement structure for an internal combustion engine having
Wherein in the cylinder arrangement direction on the end side of the throttle body, the support member for supporting the fuel supply pipe is disposed, together with the intake system sensor is fixed to the side of the cylinder arrangement direction outside of the support member, wherein An intake system sensor arrangement structure for an internal combustion engine , wherein an opening through which a sensing pipe connecting the plurality of sensors and the intake passage passes is formed in the support member . The internal combustion engine is a V-type multi-cylinder engine;
2. The intake system sensor arrangement structure according to claim 1, wherein the intake system sensor is provided at an intermediate position between the intake passage on one bank side and the intake passage on the other bank side. The intake system sensor includes a plurality of sensors and a sensor body formed in an elongated shape,
The intake system sensor arrangement structure for an internal combustion engine according to claim 1 or 2, wherein the sensor body is attached to the support member in a state in which a longitudinal direction of the sensor body and a longitudinal direction of the support member are inclined to each other.

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