Honda Giken Kogyo Kabushiki Kaisha

Keiichi Osawa

Kunio Noguchi

Hiroyuki Nishimura

Tadashi Umeda

Kiyoshi Ishii

Kazushige Toshimits

Naohiko Sato

A fuel supply control system for an internal combustion engine having a throttle body, and a fuel injection valve arranged in an intake manifold upstream of the throttle body for supplying fuel to all cylinders. An air throttle valve has a valve body having a notched opening formed therein and disposed to be opposite the nozzle of the fuel injection valve to increase the flow speed of intake air in the vicinity of the nozzle when the air throttle valve is fully closed. An electronic control unit controls the fuel injection valve in response to operating conditions of the engine. The electronic control unit causes the air throttle valve to be fully closed when a predetermined low rotation-speed operating condition of the engine, in which at least the rotational speed of the engine is lower than a predetermined value, is satisfied. The predetermined value of the rotational speed of the engine is set such that the lower the atmospheric pressure the smaller the predetermined value.

Fuel supply control system for internal combustion engines

An exhaust gas recirculation system for an internal combustion engine employs a recirculation control valve in a passageway connecting the engine exhaust passage to the engine intake passage downstream from the throttle valve. An air conduit having an air control valve therein draws atmospheric air into the intake passage downstream from the throttle valve. Vacuum responsive actuators are provided for each of the control valves and they are operated by vacuum pressure controlled by a regulating valve, which regulating valve is responsive to differential pressure between vacuum intensity in the intake passage upstream from said throttle valve and modified atmospheric pressure. The modified atmospheric pressure is obtained downstream of a fixed or variable restriction in the air conduit.

Engine exhaust gas recirculation system

An auxiliary fuel system for an internal combustion engine which supplements the primary fuel means for delivering fuel through a carburetor passage to said engine. The auxiliary fuel system is comprised of first and second fuel valves placed in parallel which introduce extra fuel into the intake passage of the carburetor at heavy load conditions. The first fuel valve is of the diaphragm operated type and opens and closes as a function of the pressure in a first vacuum chamber being alternatively connected to either a vacuum source at the intake passage of the carburetor or to the atmosphere. A series of electromagnetic selector valves and check valves determine the pressure conditions within said vacuum chamber. The second fuel valve is also of the diaphragm operated type, but the diaphragm is actuated by a mechanical linkage system interconnected to the throttle valve. As in the first fuel valve, movement of the dash pot diaphragm is a function of the pressure in the dash pot vacuum chamber which communicates with either the carburetor intake passage or to the atmosphere. A spark advance system is functionally interconnected to said auxiliary fuel feed control system. An electrical switching system controls the operation of both the auxiliary fuel system and the ignition timing control system so that addition of fuel during sudden non-steady state accelerations from medium speeds is delayed, and the air-fuel mixture is maintained leaner than the stoichiometric ratio. Harmful components exhausted into the atmosphere are thus minimized.

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Wako, Japan

Keiichi Osawa