This nonprovisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2006-270000, filed in Japan on Sep. 29, 2006, entirety of which is incorporated herein by reference.
1. Field of the Invention
The present invention relates to an electronic throttle control device in a V-type internal combustion engine for a vehicle. More particularly, the present invention relates to an electronic throttle control device, wherein the amount of operation of the throttle by an operator of the vehicle is electrically detected by a sensor. Also, an electrical output based on a detection signal from the sensor is fed through a wire to a throttle driving motor provided in the vicinity of a throttle valve, whereby the opening angle of the throttle valve is controlled by the power from the throttle driving motor.
2. Background of the Invention
In an internal combustion engine for a vehicle including an electronic throttle control device, a throttle driving motor for driving a plurality of throttle valves is located at a substantially central position of the internal combustion engine as viewed in plan (For example, see Japanese Patent Laid-Open No. 2006-42446).
The internal combustion engine for the vehicle disclosed in Japanese Patent Laid-Open No. 2006-42446 is an in-line four-cylinder internal combustion engine having four throttle bodies respectively connected to the four cylinders. The throttle bodies are fixedly mounted on a cylinder head so as to be pointed obliquely upward. A plurality of throttle shafts for respectively supporting the throttle valves are arranged in a line and are axially connected with each other along the cylinder train. The throttle driving motor is located adjacent to the upper end of any one of the throttle bodies at the center of the cylinder train. A drive shaft of the throttle driving motor is connected through a speed reduction gear train to any one of the throttle shafts. Accordingly, there is a possibility that an air cleaner for supplying air through the throttle valves into the cylinders may interfere with the throttle driving motor, which is located at a high position, and a large-diameter input gear of the speed reduction gear train. Therefore, the air cleaner is spaced apart from a cylinder head cover of the internal combustion engine, causing a problem in that a size reduction of the internal combustion engine is difficult.
It is accordingly an object of the present invention to provide an electronic throttle control device in a V-type internal combustion engine for a vehicle, which can be improved in maintainability and can be reduced in size.
In accordance with a first aspect of the present invention, an electronic throttle control device in a V-type internal combustion engine for a vehicle is provided. The V-type internal combustion engine has a fuel injection valve 20 and throttle valves 11 in an intake passage. A throttle driving motor 31 controls the opening angle of each throttle valve 11 according to the amount of operation of the throttle performed by an operator of the vehicle. The throttle driving motor 31 is located outside a region X surrounded by the throttle bodies 10 that are respectively connected to all of the intake ports 9 as viewed in plan.
In accordance with a second aspect of the present invention, the fuel injection valves are located inside the region X surrounded by the throttle bodies 10 that are respectively connected to all of the intake ports 9 as viewed in plan.
In accordance with third aspect of the present invention, the throttle driving motor includes a single throttle driving motor that is connected to a first throttle shaft for supporting at least one of the throttle valves in the first bank. The first throttle shaft is connected through a link to a second throttle shaft for supporting at least one of the throttle valves in the second bank.
In accordance with a fourth aspect of the present invention, the throttle driving motor includes a first throttle driving motor connected to a first throttle shaft for supporting at least one of the throttle valves in the first bank, and a second throttle driving motor connected to a second throttle shaft for supporting at least one of the throttle valves in the second bank.
In accordance with a fifth aspect of the present invention, the throttle driving motor comprises: a first throttle driving motor connected to a first throttle shaft for supporting at least one of the throttle valves in the first bank; and a plurality of second throttle driving motors respectively connected to a plurality of second throttle shafts for respectively supporting at least two of the throttle valves in the second bank.
According to the first aspect of the present invention, the throttle driving motor is located outside the region surrounded by all of the throttle bodies that are respectively connected to all of the intake ports as viewed in plan. Accordingly, the maintenance of a throttle valve driving system can be performed easily and efficiently without interference with the nearest throttle body. Furthermore, an intake passage can be made substantially straight due to the specific location of the throttle driving motor, so that an intake resistance can be reduced to improve the charging efficiency of intake air.
According to the second aspect of the present invention, all of the fuel injection valves are located inside the above region surrounded by the throttle bodies 10 that respectively connected to all of intake ports 9 as viewed in plan. Accordingly, a fuel supply line for supplying fuel to all of the fuel injection valves can be reduced in length and simplified in structure.
According to the third aspect of the present invention, all of the throttle valves can be driven by a single throttle driving motor. Accordingly, the structure of the throttle valve driving system can be simplified, and the cost therefor can be reduced.
According to the fourth aspect of the present invention, at least one throttle valve in the first bank is driven by the first throttle driving motor, and at least one throttle valve in the second bank is driven by the second throttle driving motor. Accordingly, at least one cylinder in either the first bank or the second bank can be put into an inoperative condition as required. Furthermore, the link for connecting the first throttle shaft and the second throttle shaft can be omitted to thereby simplify the connecting mechanism and to reduce the cost.
According to the fifth aspect of the present invention, at least one throttle valve in the first bank is driven by the first throttle driving motor, and at least two throttle valves in the second bank are individually driven by the respective second throttle driving motors. Accordingly, all of the cylinders can be individually put into an inoperative condition as required. Alternatively, the outputs from all of the cylinders can be individually controlled, thereby improving fuel economy.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
The present invention will now be described in detail with reference to the accompanying drawings, wherein the same reference numerals will be used to identify the same or similar elements throughout the several views. It should be noted that the drawings should be viewed in the direction of orientation of the reference numerals.
A first preferred embodiment of the present invention will now be described with reference to
Each cylinder 4 is formed with a cylinder bore 7. A piston 8 is slidably fitted in the cylinder bore 7 of each cylinder 4. The piston 8 is connected through a connecting rod (not shown) to a crankshaft (not shown) that extends in the transverse direction of the vehicle, so that the crankshaft is rotationally driven by the reciprocating motion of the piston 8 in each cylinder 4.
Each cylinder head 5 is formed with an intake port 9 exposed to the inside of the V-shaped space. Each cylinder head 5 is further formed with an exhaust port (not shown) opposite to the intake port 9 in the longitudinal direction of the vehicle. The intake port 9 has an upstream end, to which the downstream end of a throttle body 10, including a throttle valve 11, is connected. Reference numeral 14 identifies an air cleaner having a cleaner case 15. An intake pipe 13 extends through the wall of the cleaner case 15 of the air cleaner 14. The intake pipe 13 has a downstream end connected to the upstream end of the throttle valve 11.
The inside space of the cleaner case 15 of the air cleaner 14 is divided into a clean space 16 on the rear side and a dust space 17 on the front side by a cleaner element 18 substantially vertically mounted in the cleaner case 15. The upstream end of the intake pipe 13 opens into the clean space 16 in the cleaner case 15. The front portion of the cleaner case 15 is formed with a pair of right and left lower openings exposed to the dust space 17. The downstream ends of a pair of right and left air intake ducts 19 are respectively connected to the right and left lower openings of the front portion of the cleaner case 15. The upstream ends of the right and left air intake ducts 19 extend through the right and left main frames 2, and open into the space surrounded by a front cowl or a front cover (both not shown). Alternatively, the upstream ends of the right and left air intake ducts 19 may be exposed directly to the front side of the vehicle body.
Furthermore, a fuel injection valve 20 is mounted on the throttle body 10 so as to be located in the V-shaped space between the front and rear banks. The fuel injection valve 20 is pointed obliquely downward so that fuel is injected from the nozzle thereof toward the inner wall surface of the corresponding intake port 9.
As shown in
As shown in
The throttle valve driving unit case 32 is formed integrally with the left throttle body 10 in the front bank. The throttle valve driving unit case 32 has a motor storing chamber 33 for storing the throttle driving motor 31. The shaft 35 for rotatably supporting the intermediate gear unit 27 has one end fixed in a hole formed on the throttle valve driving unit case 32 and the other end fixed in a hole formed on the unit case cover 34.
As shown in
A throttle grip (not shown) of the motorcycle is provided with a throttle operation sensor (not shown). On the other hand, a throttle position sensor 36 is located so as to face the left end of the throttle shaft 12 in the left arm 21 in the front bank. Although not shown, a throttle control device is provided to control the large-diameter gear 29 so that the difference between an output from the throttle operation sensor and an output from the throttle position sensor 36 becomes zero. Accordingly, when the throttle grip is operated in an accelerating or decelerating direction by the rider, the large-diameter gear 29 is operated according to a detection value output from the throttle operation sensor, so that all of the throttle valves 11 are controlled to an opening angle corresponding to the operation amount of the throttle grip.
As shown in
As shown in
The preferred embodiment shown in
When the throttle grip (not shown) is rotated to a required angle by the rider, this rotational angle is detected by the throttle operation sensor, and the throttle driving motor 31 is operated by an amount according to a detection signal output from the throttle operation sensor. Accordingly, all of the throttle valves 11 are simultaneously controlled to an opening angle according to the rotational angle of the throttle grip.
In the V-type internal combustion engine 1, each throttle body 10 is located in the V-shaped space between the front bank and the rear bank and is connected to the corresponding intake port 9 formed in the corresponding cylinder head 5. Accordingly, as shown in
The dust space 17 is formed on the front side of the cleaner space 16, and the downstream ends of the air intake ducts 19 are connected to the dust space 17. Furthermore, the right and left air intake ducts 19 respectively extend through the right and left main frames 2. The upstream ends of the air intake ducts 19 are pointed to the front side of the vehicle, so that the air flow associated with running of the vehicle can be smoothly introduced into the clean space 16 in the cleaner case 15.
Each fuel injection valve 20 is obliquely mounted to the corresponding throttle body 10 so as to be pointed toward the downstream side of the throttle body 10. Accordingly, fuel is injected from each fuel injection valve 20 toward the inner wall surface of the corresponding intake port 9 downstream of the corresponding throttle body 10, so that the fuel injected from each fuel injection valve 20 is sufficiently mixed with the intake air passing through the intake passage in the corresponding throttle body 10. Furthermore, the fuel deposited on the inner wall surface of the corresponding intake port 9 is exposed to the intake air passing through the intake passage in the corresponding throttle body 10, so that the amount of deposited fuel on the inner wall surface of the intake port 9 can be reduced to thereby improve the operation response of the V-type internal combustion engine 1.
The throttle driving motor 31 and the speed reducing mechanism 25 are located on the left side of the left throttle body 10 in the front bank of the V-type internal combustion engine. Accordingly, the maintenance of a throttle valve driving system (including the throttle driving motor 31 and the speed reducing mechanism 25) for driving all of the throttle valves 11 can be easily performed.
The axes of the reduction gears constituting the speed reducing mechanism 25 are arranged in a line at an angle of about 70° with respect to the center line of the left throttle body 10 and the associated intake pipe 13. Accordingly, the cleaner case 15 can be located close to the front head covers 6 of the V-type internal combustion engine 1 without a large interference with the throttle valve driving unit case 32, thereby reducing the overall size of the V-type internal combustion engine 1.
Furthermore, all of the four throttle valves 11 in the front and rear banks can be simultaneously operated by the single throttle driving motor 31, thereby simplifying the structure and reducing the cost.
In the third preferred embodiment illustrated in
The fourth preferred embodiment illustrated in
The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
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