Nissan Motor Company Limited

Hidehiro Minami

Masaaki Saito

Kenji Masaki

Giichi Shioyama

Shuya Nambu

Ryoichi Nakagawa

Hatsuo Nagaishi

Kenji Ikeura

Yoshihisa Kawamura

Yoshitaka Hata

Kenji Okamura

Kohki Sone

Hideo Kamino

Kazuo Abe

Teruo Aoki

Yoshitaka Kitagasaki

A gas sensor, e.g. oxygen sensor of the solid electrolyte concentration cell type, having a gas-sensitive element comprising a plate-shaped substrate fixed to an end portion of the sensor body and a laminate of relatively thin layers. A hollow cylindrical protective hood is attached to the sensor body to enclose the sensitive element therein, and two or more openings are formed in the cylindrical wall of the hood to allow a gas subject to measurement to flow into the interior of the hood and flow out. To avoid direct exposure of the sensitive element, which exhibits directionality in its output characteristics with regard to the gas flow through said openings, each of said openings is located between the sensitive element and the free end of the hood such that a cross-sectional plane intersecting the openings does not intersect the sensitive element.

Gas sensor with sensitive element enclosed in perforated hood

The emission level of NOx of a spark-ignition internal combustion engine is lowered by recirculating a relatively large amount of exhaust gases into the combustion chambers of the engine, whereas the emission levels of CO and HC are lowered by controlling the air-fuel ratio of the air-fuel mixture supplied into the combustion chambers at a desired value utilizing feedback techniques in accordance with the composition of the exhaust gases discharged from the combustion chambers.

Spark-ignition internal combustion engine capable of reducing noxious

In an automotive internal combustion engine equipped with an exhaust cleaning catalytic converter and a mixture control system to control the richness of the mixture toward a predetermined air-to-fuel ratio that will enable the catalytic converter to produce a maximum conversion efficiency, means are provided to disable the mixture control system and/or reduce the spark advance degrees under low-temperature operating condition of the engine.

Automotive internal combustion engine

A method of and apparatus for controlling the air-to-fuel ratio of a combustible mixture in an internal combustion engine of the particular type using mixture control means arranged to regulate the air-to-fuel mixture within a predetermined relatively high range for the purpose of enabling an exhaust cleaning catalytic reactor to perform its maximum function, characterized in that the air-to-fuel ratio is reduced, viz., the mixture is enriched during highly loaded operational conditions of the engine by supplying additional fuel to the mixture supply system of the engine, temporarily disabling the mixture control means during such conditions or diluting the exhaust gases during high load conditions of the engine so that the control means is caused to operate in such a manner as to compensate for the reduced concentration of air in the exhaust gases.

Method of and apparatus for controlling air/fuel ratio in internal

The provision of an air-fuel ratio control is made to the secondary side of a twin-barrel carburetor as well as the primary side thereof.

Twin-barrel carburetor with an air-fuel ratio control device

A valve closes a fuel passage or an air bleed of a low speed circuit of a carburetor to reduce the amount of air drawn from the low speed circuit into a high speed circuit by a main venturi vacuum higher than an induction passageway vaccum, for example, to zero to prevent an air-fuel mixture provided by the high speed circuit from being excessively leaned.

Car knock preventive system

An altitude compensation assembly is incorporated into a conventional carburetor for use with an electronic closed loop air-fuel ratio control system in order to obviate an undesirable enrichment of an air-fuel mixture due to a reduction of air density while a vehicle is operated at higher altitudes.

Carburetor with altitude compensation assembly

The air-to-fuel ratio of the air-fuel mixture supplied into the combustion chambers of an internal combustion engine can be changed continuously and smoothly to control the air-to-fuel ratio at a required value utilizing a feedback technique is response to the composition of the exhaust gases although a solenoid actuated valve for regulating the fuel amount to prepare the air-fuel mixture is operated in an on and off manner.

Internal combustion engine with air-fuel ratio control device

Secondary air is fed into the engine exhaust gas passageway at a position upstream of an oxygen sensor to cause the electric air-fuel ratio control device and the air-fuel mixture generator to provide an air-fuel mixture having an air-fuel ratio lower than a set desired air-fuel ratio during idle and slow speed running of the engine.

Air-fuel ratio control adjusting system in an internal combustion engine

The position of a fuel nozzle of a variable size venturi carburetor is adjustable with respect to the venturi orifice in dependence on climatic conditions such as an ambient temperature and/or atmospheric pressure. An additional air delivery passageway controllable by an electronic air/fuel ratio control system in dependence on an exhaust gas sensor signal is connected with the fuel nozzle.

Variable size venturi carburetor with an electronic air/fuel ratio

A multi cylinder torch ignition internal combustion engine including a main combustion chamber and an auxiliary combustion chamber for each is cylinder designed for proper air-fuel ratios of mixtures for both types of combustion chambers. In order to effectively prevent uneven distribution of air-fuel mixture in each of the engine cylinders irrespective of complicated configuration of the intake manifold of the engine, an intake valve is provided in each of the main combustion chambers and the auxiliary combustion chambers. The latter communicate with the main combustion chambers and have an ignition plug therein. An independent intake passageway is between each intake valve and the intake manifold, and a fuel injection device is disposed in each of the intake passageways. By this arrangement, a proper air-fuel mixture ratio can be individually maintained in the main combustion chamber and the auxiliary combustion chamber.

Fuel feed control system of internal combustion engine

An intake manifold of a multi-cylinder internal combustion engine is constructed so as to feed a rich air-fuel mixture into certain cylinders, and a lean mixture into the others.

Multi-cylinder internal combustion engine

Herein disclosed is an apparatus by which an exhaust gas sensor is placed in flow communication with the exhaust gases issued from an engine. The apparatus is so constructed and arranged such that a volume of air is maintained about a body portion of the exhaust gas sensor in heat conductive relation with the exhaust gases. The apparatus may be provided with a heater around a probe portion of the exhaust gas sensor which projects into the exhaust conduit. The heater is selectively energized to heat the probe portion when the temperature of the exhaust gases is low.

Apparatus for mounting exhaust gas sensor

One-half of combustion chambers is fed with a lean air-fuel mixture the ratio of which is above the ratio at which maximum quantities of NO.sub.x are formed and the other half with a rich mixture the ratio of which is below the ratio at which maximum quantities of NO.sub.x are formed, the rich mixture ratio depending on vehicle speed. Above a predetermined load all chambers are fed with a richer-than-stoichiometric mixture and air may be added to the exhaust.

Growing community of inventors

Yokohama, Japan

Hidehiro Minami