Honda Giken Kogyo Kabushiki Kaisha

Shinichi Isomura

Masahiro Asai

Yoichi Ishibashi

Takeshi Koyabu

Osamu Kudou

Masashi Amano

Hideki Noritake

Masami Takubo

Yoici Ishibashi

Osamu Kudo

To provide a two-cycle internal combustion engine capable of preventing the blow-by phenomenon to improve fuel economy and attain a high exhaust gas purifying performance, and increasing the responsiveness of fuel injection volume. In a two-cycle internal combustion engine, a chamber is disposed in scavenging passages for communicating a crank chamber to a combustion chamber, sealable control valves are respectively disposed in an inlet and an outlet of the chamber, and a fuel feeding system for the supply of fuel into the chamber is provided. The chamber is communicated to one scavenging passage out of a plurality of parallel scavenging passages. The combustion chamber side control valve disposed at an outlet of the chamber on the downstream side of the crank case side control valve provided at an inlet of the chamber, is positioned at the bottom portion of a scavenging passage communicated to the chamber.

Two-cycle internal combustion engine

A control valve is disposed in a communication passage for communication between a combustion chamber and a chamber portion adjacent to the combustion chamber, and through the communication passage at least one of a fuel and an air-fuel mixture, and a highly compressed gas, are supplied or charged into the combustion chamber and the chamber portion adjacent thereto, respectively. The control valve includes a first control valve disposed in the first communication passage and a second control valve disposed in the second communication passage, the first control valve causes the first communication passage to open at a timing near closing of an exhaust port and causes it to close halfway in a compression stroke. The second control valve causes the second communication passage to open at a timing near closing of the scavenging ports and causes it to close prior to closing of the first communication passage.

A combustion controller for a two-cycle engine which enables to cause self firing always at the optimum timing is provided. The combustion controller comprises an exhaust control valve 15 provided in the vicinity of an exhaust port 7 of the two-cycle engine 1 and capable of fully closing the exhaust port and driving control means 47, 38, 39, 40 and 37 to drive the exhaust control valve 15 according to a control map giving an exhaust opening ratio .theta..sub.e depending at least on the engine speed and the throttle valve opening ratio .theta..sub.th in order to control the pressure in the cylinder during up-stroke of the piston 8. The exhaust control valve 15 is formed by a thin shell-like member comprising an exhaust control portion 35 substantially along the cylinder curvature in the exhaust port 7 and wider than the whole width of the exhaust port and a swinging arm portion 34 for connecting at least a side of the exhaust control portion and the rotational shaft 33 perpendicular to the cylinder axis and accommodated in a receiving recess formed in the cylinder block. This receiving recess is communicated with the exhaust passage extending from the exhaust port 7 only in the working zone of the exhaust control portion.

Combustion controller for a spark ignition type two-cycle engine

A deceleration control apparatus is provided which can control a two-cycle engine of the spark ignition type for a vehicle, in which fresh air in a combustion chamber can be self-ignited at an ignition timing preferable for operation of the engine at least upon low load operation, so that, when engine sudden deceleration requirements are satisfied, the combustion condition is automatically changed over from an activated heat atmosphere combustion condition to an ordinary combustion condition to allow sudden deceleration of the engine. A sudden deceleration requirement discrimination CPU for discriminating requirements which require sudden deceleration of the vehicle receives, in addition to a detection signal from a throttle valve opening sensor, detection signals from a vehicle speed sensor, a kill switch, a main switch, a brake switch for detecting that the brakes are applied, a clutch switch for detecting that the clutch is disconnected, and a gear position switch for detecting that the shift operation position is operated to the neutral position, and when the requirements which require sudden deceleration are satisfied, the sudden deceleration requirement discrimination CPU sends an exhaust control valve opening correction signal to an exhaust control valve CPU.

Deceleration control apparatus for two-cycle engine of the spark

An exhaust control device for a two-cycle engine which does not impart a change of a shape of an exhaust passage. An exhaust control device is provided in an exhaust port opening to an inner peripheral surface of a cylinder hole of a two-cycle engine wherein a cylinder wall portion adjacent to the exhaust port is formed with a rotational face obtained by rotating an arc having substantially the same curvature as the inner peripheral surface of the cylinder hole about a rotational axis C.sub.1 extending at a right angle to an axis C of the cylinder hole in the outside of the cylinder hole and a recess defined by both ends at a right angle to the rotational axis C.sub.1 and in communication with the exhaust port. Within the recess is mounted an exhaust: passage member having an exhaust passage in communication with the exhaust port and having an external shape substantially similar to the recess with a predetermined clearance formed relative to the recess in a portion above at least an upper edge of the exhaust port of the rotational face portion and the both end portions. A valve body is provided which comprises arm portions respectively inserted into the clearance in the both end portions and supported for swinging about the rotational axis C.sub.1 and a control face portion provided by connecting ends of the arm portions together and movable in and out of the clearance in the rotational face portion in response to the swinging of the arm portions.

Growing community of inventors

Saitama, Japan

Shinichi Isomura