摘要:
PROBLEM TO BE SOLVED: To provide an internal combustion engine capable of reducing temperature of air to be introduced into a combustion chamber to improve volume efficiency and attaching a fuel injection valve to a fuel distribution pipe easily. SOLUTION: In this internal combustion engine 1, two port injection valves 2 1 , 2 2 are arranged in parallel on two parallel planes PS 1 , PS 2 crossing a plane PV including respective shaft parts 11 of two intake valves 10 1 , 10 2 orthogonally, respectively. Flat fuel spray Fm is injected from two port injection valves 2 1 , 2 2 to let it pass between umbrella parts 12 of the intake valves 10 1 , 10 2 and an intake passage opening part and let it flow into the combustion chamber 1b. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide an intake port structure of an internal combustion engine capable of suppressing decrease in flow coefficient. SOLUTION: In an intake port structure of an internal combustion engine, an intake port 10 has a vertical passage 12 vertically extending to a combustion chamber top surface 2 so as to open to it and a tilt passage 11 communicating with the vertical passage 12 and extending in the direction tilted in a vertical direction of the combustion chamber top surface 2. A recess 21 is formed in a tilt wall surface 11a which is a lower wall surface of the tilt passage 11. In the recess 21, an end of the combustion chamber side is extended to the boundary D between the tilt passage 11 and the vertical passage 12 so as to be gradually widened toward the combustion chamber side. The end of the combustion chamber side in the recess 21 is provided with a connecting surface 22 in which an edge 31 is formed with respect to a vertical wall surface 12a of the vertical passage 12 to be connected. COPYRIGHT: (C)2005,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide an intake valve controller of an internal combustion engine capable of effectively vaporizing and atomizing a fuel in cylinders without using a special means such as a tumble control valve and a swirl control valve and also a means for increasing a fuel injection pressure. SOLUTION: An three-intake valve direct-injection engine comprises a third intake valve 43c opening and closing a third intake port 42c opposed to an injector 2; and first and second intake valves 43a, 43b opening and closing first and second intake ports 42a, 42b adjacent to the third intake port 42c. During the cold operation, only the third intake valve 43c is opened during the intake stroke. Under low rotational speed and high load, only the first and second intake valves 43a, 43b are opened during the intake stroke. Under the high rotational speed, all of the intake valves 43a, 43b, 43c are opened during the intake stroke. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an internal combustion engine provided with a fuel injection device near a suction valve suppressing blow by of unburned fuel to an exhaust side at a time of valve overlapping. SOLUTION: A fuel injection device 15 having an injection hole formed below one suction passage 7B of three suction passages 7A-7C and near the suction valve 9B of the suction passage 7B oriented to an inside of a combustion chamber 2 via the suction passage 7B is provided. A suction air tumble flow generating structure generating tumble of suction air in the combustion chamber 2 is provided in remaining suction passages 7A, 7C. In an embodiment, the suction passages 7A, 7C are erected in an axial direction of the combustion chamber 2 to construct the suction air tumble generating structure. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To make the revolving ratio of air sucked in a combustion chamber in the combustion chamber as large as possible while maintaining the total quantity of the air sucked in the combustion chamber of an internal combustion engine large. SOLUTION: An intake passage 4 communicated with the combustion chamber is provided to send air into the combustion chamber 1. The intake passage is curved to a certain direction and communicated with the combustion chamber. A groove 6 extending along the flow of air in the intake passage is provided in a wall at a side near a center of curvature of the intake passage in the wall defining the intake passage. Longitudinal edges 7a, 7b extending along the flow of air in the intake passage and projecting out toward the inside of the intake passage are formed of one side wall of the wall defining the groove and the wall adjoining the side wall in the wall defining the intake passage. A bent part 11 extending in the horizontal direction with respect to the flow of air in the intake passage is provided proximity to a line 12 connecting the intake passage and the combustion chamber at the wall of the side near the center of curvature of the intake passage in the wall defining the intake passage. COPYRIGHT: (C)2004,JPO
摘要:
PROBLEM TO BE SOLVED: To solve a problem in a conventional exhaust recirculating device where a desired amount of an EGR gas can not be recirculated into an air intake passage when restarting an internal combustion engine, which is temporarily stopped.SOLUTION: The exhaust recirculating device 36 includes: the EGR passage 39a, one end of which is communicated with the air intake passage 26a and the other end of which is communicated with an exhaust passage 35a so as to guide part of the exhaust emitted from the internal combustion engine 10 into the air intake passage 26a; an EGR control valve 40 that is disposed at one end of the EGR 39a so as to control a flow rate of the exhaust flowing into the EGR passage 39a; an on-off valve 41 that is disposed at the other end of the EGR passage 39a so as to open and close the EGR passage 39a; and an exhaust pressure boosting units 16, 44 for boosting an exhaust pressure flowing into the exhaust passage 35a of part, with which the other end of the EGR passage 39a is communicated.
摘要:
PROBLEM TO BE SOLVED: To provide an internal combustion engine inhibiting a cylinder with an air-fuel ratio leaner than the stoichiometric air-fuel ratio from becoming unstable in combustion condition. SOLUTION: The internal combustion engine includes a pressure wave supercharger 10 in which the intake ports of #1, #4 cylinders 2a are connected to the first intake air discharge opening 17, the intake ports of #2, #3 cylinders 2a are connected to a second intake air discharge port 18, the exhaust ports of the #1, #4 cylinders 2a are connected to a first exhaust introduction opening 19, the exhaust ports of the #2, #3 cylinders 2a are connected to the second exhaust introduction opening 20, and the second exhaust introduction opening 20 and the first intake air discharge opening 17 are arranged in a manner that a second exhaust guide passage 4b communicates with a first intake air guide passage 3b via cells 13. The air-fuel ratios of the respective cylinders 2a are controlled so that the air-fuel ratios of the #1, 4 cylinders 2a become leaner than the stoichiometric air-fuel ratio and the air-fuel ratios of the #2, 3 cylinders 2a become richer than the stoichiometric air-fuel ratio. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a port structure of an internal combustion engine which realizes smooth inflow of air intake or emission of exhaust without causing complication of the structure. SOLUTION: The upstream part of an intake port 11 has a nearly-square cross section having two pairs of parallel surfaces, namely the top surface part 21 and un undersurface part 22, and the right-and-left sides 23, 24. A throat part 11a leading to a combustion chamber 12 is circular in the cross section, and the upstream part of the intake port 11 having a nearly-square cross section and the throat part 11a having a circular cross section are made continuous to each other by a smooth surface. Thus, a strong tumble stream is formed, separation of an intake stream is controlled, and the intake flow rate is increased. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To discharge exhaust smoothly without complicating a structure, in a port structure of an internal combustion engine.SOLUTION: An upstream part of an exhaust port 41 is substantially formed with a square cross section having two planes parallel to each other, while a throat portion 41a continuing from a combustion chamber 12 is formed with a circular cross section. As a result, the upstream part of the exhaust port 41 and the throat portion 41a are continuously formed with a smooth plane, which prevents separation of exhaust stream to increase an intake flow.
摘要:
PROBLEM TO BE SOLVED: To provide a supercharging device for an internal combustion engine, which recirculates low-temperature exhaust gas to an intake passage and is advantageous to NOx reduction. SOLUTION: This supercharging device for the internal combustion engine is applied to the internal combustion engine 1 taking out part of exhaust gas from an exhaust passage 4 and recirculating it to the intake passage 3, when a predetermined EGR condition is satisfied, and includes a pressure wave supercharger 10 for supercharging the internal combustion engine 1. In the supercharging device, the rotor 12 of the pressure wave supercharger 10 is rotatively driven by an electric motor 18, and the operation of the electric motor 18 is controlled so that, when the EGR condition is not satisfied, the rotor 12 is rotatively driven at a normal rotational speed set based on the engine speed of the internal combustion engine 1, and when the EGR condition is satisfied, the rotor 12 is rotatively driven at EGR rotational speed higher than the normal rotational speed. COPYRIGHT: (C)2011,JPO&INPIT