Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Yoichi Ishibashi

Masahiro Asai

Shinichi Isomura

Hideaki Morikawa

Masahiko Abe

Yasuhiko Nakano

Kenichi Noda

Kenjiro Saito

Ryutaro Yamazaki

Takaharu Kurosaki

Yuji Tsushima

Takeshi Koyabu

Shoji Masuda

Hideki Noritake

Masami Takubo

Shunsuke Kitawaki

Yoshiyasu Uchida

Shinichi Wakabayashi

Osamu Kudo

To avoid the generation of a pumping loss, a communication passage is formed as a bypass passage between an exhaust port and a combustion chamber in an internal combustion engine. The communication passage is provided with a one-way valve as an exhaust gas return amount adjustment means. The one-way valve includes a spring member having a spring constant set to the value such that a valve body does not displace toward the combustion chamber under the pressure of the exhaust gas in the exhaust port. An opening degree of the one-way valve is autonomously adjusted depending on the amount of air introduced from an intake manifold when the pressure within the combustion chamber becomes negative in the intake stroke. Then inside of the combustion chamber is kept at substantially the atmospheric pressure with the exhaust gas returned to the combustion chamber via the communication passage and the aforementioned air.

Load control mechanism for internal combustion engine

An engineprovided with a fuel injection mechanism (a fuel injection systemand an FI control unit) that supplies fuel of arbitrary quantity into a combustion chamberand a variable valve mechanism (an intake valve, an exhaust valve, hydraulic electromagnetic valve drive unitsand a valve event control unit) that varies the ratio of burned gas and air-fuel mixture in the combustion chamberfor combusting fuel by compression self ignition, is controlled so that a deviation &#x394;T between combustion initiation temperature and peak temperature after combustion in the combustion chamberis converged in a predetermined range.

Control method of compression self ignition internal combustion engine

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

An exhaust passage for connecting to an exhaust port of a cylinder is provided. The exhaust passage includes a first path extending in a direction generally orthogonal to the central axis of the exhaust port. A second path connects the first path and the exhaust poil and a control valve is provided in the first path. The rotational axis of the exhaust control valve is generally parallel to the direction in which the first path extends. The surface area of an opening connecting the first path and the second path is variable as the exhaust control valve rotates, so as to carry out controlled combustion and exhaust timing. This makes it unnecessary to provide a hollow section for housing an exhaust control valve and bearing at a position close to the exhaust. It is also possible to reduce the size of a cylinder block and to realize smooth flow of exhaust gases by making the inner peripheral surface of the exhaust passage smooth.

Exhaust control valve structure for 2-cycle engine

Exhaust gas purifier

In a spark-ignition two-cycle engine, the inlet end of a cylinder cooling water passage is connected to the discharge port of a cooling water pump by a cooling water pipe. The inlet end of a cylinder head cooling water passage is connected to the discharge port of a cooling water pump by a cooling water pipe. The outlet end of the cylinder cooling water passage is connected through a thermostat to the upper end of a cylinder cooling radiator, and the outlet end of the cylinder head cooling water passage is connected through a three-way valve to the upper end of a cylinder head cooling radiator and a pipe fitting. Upon the increase of the temperature of the cooling water for cooling the cylinder head to a predetermined temperature, a CPU provides a control signal to a servomotor to close a port of the three-way valve connected to the pipe fitting and to open a port of the three-way valve connected to the cylinder head cooling radiator.

Cooling system for spark-ignition two-cycle engine

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

A combustion controller for an internal combustion spark ignition type two-cycle engine includes exhaust passage opening ratio adjusting means for adjusting an exhaust passage opening ratio, wherein the exhaust passage opening ratio adjusting means is driven to adjust the exhaust passage opening ratio at a value corresponding to an engine speed and a throttle valve opening ratio at least in a low load operational area. And fresh mixture in a combustion engine is self-fired with a firing timing desirable for operation of the engine. In this engine, the combustion controller includes ignition timing adjusting means for adjusting an ignition timing; abnormal combustion detecting means for detecting abnormal combustion in the combustion chamber; and control means for controlling the exhaust passage opening ratio. The ignition timing at respective values eliminates the abnormal combustion on the basis of the detection signal from the abnormal combustion detecting means.

A throttle-valve control apparatus is provided for allowing switching from an ordinary-combustion state to an AR-combustion state or vice versa to take place with ease in an AR-combustible spark-ignition two-cycle engine wherein, at least during a light-load operation, a compression-start pressure is properly controlled in order to let fresh air in a combustion chamber self-ignite so as to undergo active thermal atmosphere combustion. A throttle drum is linked to a throttle grip through a wire. The throttle drum is also linked to a throttle valve through a linking mechanism. An arm forms a single body with the throttle drum. An adjustment screw is fixed at the end of the arm. A cam is supported at such a location that the cam can be brought into contact with the adjustment screw. A pulley forms a single body with the cam. A cable which is wound around the pulley is linked to a throttle-valve servo motor. In ordinary combustion ignited by spark ignition, the cam is erected, preventing the throttle opening rate .theta..sub.th of the throttle valve from decreasing to a value smaller than, typically, 17%.

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Saitama, Japan

Yoichi Ishibashi