Showing papers on "Secondary air injection published in 1980"

Furnace control using induced draft blower and exhaust gas differential pressure sensing

Abstract: A heating system of the type having a combustion chamber with a fuel burner, an inlet for combustion air and an exhaust stack is improved by adding a variable-speed induced draft blower, a flow-restricting stack orifice and a fuel valve sensitive to the exhaust gas flow rate through the stack orifice. The fuel valve turns on at a first predetermined exhaust gas flow rate and turns off at a second predetermined exhaust gas flow rate, which is lower than the first predetermined rate. The fuel valve also supplies fuel at a rate proportional to the exhaust gas flow rate. Sensing of the differential pressure across the stack orifice is used to determine the exhaust gas flow rate.

Air-Fuel Control to Reduce Emissions I. Engine-Emissions Relationships

Abstract: Relationships between the oxidants and the unburned fuels in the exhaust gas provide effective measures of emission system performance. These include the mean deviation from stoichiometry, air-fuel distribution, and catalyst storage effects all under dynamic conditions. Basic concepts of the interaction of air-fuel ratio, exhaust gas composition and catalyst performance are reviewed, further developed and simplified for use by the development engineer in evaluating system performance.

Device for improving combustion efficiency of mixture in four cycle internal combustion engine

Abstract: A device for improving combustion efficiency of mixture in a four cycle internal combustion engine is disclosed in which burnt gas is introduced, upon the intake stroke, into a combustion chamber from an exhaust passage to generate a swirl whereby fresh mixture supplied from an intake port to the combustion chamber is disturbed to form a strong swirl. To this end, the valve opening periods of intake and exhaust valves are partially overlapped with each other and a swirl generating guide wall is formed around an exhaust port and extends inwardly from the combustion chamber wall so that a part of burnt gas flows back, upon the intake stroke, into the combustion chamber through the exhaust port unclosed by the exhaust valve to impinge against the guide wall thereby to generate a swirl. A portion of the exhaust passage leading to the exhaust port may extend in a direction offset from the center of the combustion chamber so as to promote the generation of a swirl. Two exhaust ports may be provided instead of a single exhaust port.

Method for cyclic rejuvenation of an exhaust gas filter and apparatus

Abstract: A system for filtering combustible particulate matter from an exhaust gas stream, and for periodically rejuvenating the filter by thermally incinerating retained particles prior to their reaching the main filter. At least a part of the exhaust gas stream which enters the filter bed is periodically heated in a pretreating chamber. The latter comprises a catalyst coated oxidizing bed into which fuel, and heated air are metered to initiate combustion. The products of said combustion are thereafter combined with the exhaust gas to bring it to a sufficient temperature to incinerate the carried particles.

Fuel injection type carburetor

Abstract: A fuel injection type carburetor for multi-cylinder internal combustion engines includes: a throttle body having a throttle bore extending substantially vertically and being connected at the bottom portion thereof to a collecting portion of an intake manifold extending substantially horizontally; a throttle valve arranged in the throttle bore, a linear injection type fuel injection valve having a fuel injection nozzle arranged in the throttle bore in an area downstream area of the throttle valve and inclined toward the downstream direction; and an atomization promoting device arranged at a position opposite to the fuel injection nozzle so as to face the nozzle. The atomization promoting device is, for instance, a high frequency oscillator or a so-called PTC heater.

Apparatus for the catalytic purification of exhaust gases

Abstract: Baffle means coated with effective catalyts are positioned inside exhaust pipes to convert the harmful substances in said exhaust gases into harmless components. The baffle means impart a disturbed flow and/or change of the direction of flow of the exhaust gases in the exhaust pipe.

Engine exhaust gas reflux apparatus

Abstract: This patent specification discloses an engine exhaust gas reflux apparatus constructed so as to purify exhaust gas coming out of various engines mounted on vehicles or ships for preferably preventing NO x from being discharged in the atmosphere. The engine exhaust gas reflux apparatus has a technical construction which removes dust particles and impurities contained in exhaust gas by means of a dust collector installed at the discharge port of the exhaust manifold, draws purified exhaust gas into the intake manifold and lowers combustion temperature produced when the engine fuel burns to eliminate NO x out of exhaust gas coming out of the exhaust manifold.

Means for accelerating the discharge of exhaust gas from an internal combustion engine

Abstract: Means for accelerating the discharge of exhaust gas from an internal combustion engine, adapted to be mounted to the end of the engine exhaust pipe, in which exhaust gas from the engine is swirlingly guided by a plurality of spiral blades disposed in a tubular member, to form a super low pressure space at the center of the exhaust gas flow, thereby to accelerate the discharge of the exhaust gas.

Method and apparatus for a low emission diesel engine

Abstract: An improved method and apparatus four operating a high-speed four cycle compression ignition engine cause the amount of NOx in the exhaust gases to be reduced substantially. The improved method of operating the high-speed for cycle compression ignition engine is of the type wherein fresh working fluid is introduced through an intake valve, the working fluid is compressed, fuel is injected and burns thereby expanding the working fluid, and the working fluid is scavenged through an exhaust valve, the improvement comprising timing the opening of the intake valve and the closing of the exhaust valve so that no fresh working fluid is permitted to pass out the exhaust valve. The timing of the opening of the intake valve and the closing of the exhaust valve is achieved by adjusting the contours and the relative positions of the valve cams on the cam shaft of the engine.

Diesel engine exhaust gas recirculation and intake air flow control system

Abstract: In a diesel engine which includes an air intake system, an exhaust system, and an exhaust gas recirculation passage which recirculates part of the exhaust gases produced by the engine from the exhaust system to the air intake system, a control system for the recirculation of exhaust gases and the flow of intake air, having an intake air flow control valve mounted in the air intake passage, and a recirculated exhaust gas flow control valve, mounted in the exhaust gas recirculation passage, these two control valves being so coupled together that, as one of them opens progressively, the other closes progressively, and vice versa, so that exhaust gas recirculation ratio alters in substantially direct proportion to the amount of opening of the exhaust gas recirculation flow control valve.

Reciprocating external combustion engine

Abstract: A reciprocating external combustion engine wherein energy is transferred to air acting as a working gas by injection into the air of liquid water at a high temperature and pressure. The liquid water is injected either directly into the cylinder or into a preliminary mixing chamber. The water acts as a heat-transfer medium for heating the air. Spontaneous vaporization of the liquid water on injection increases the pressure of the air which drives the piston before being exhausted. The exhaust water is recovered and recycled. The cylinder is scavenged and refilled with a fresh charge of air.

Automotive exhaust system incorporating venturi to reduce back pressure

Abstract: A method and apparatus are provided for reducing back pressure within an exhaust system for an internal combustion engine by creating a venturi within the exhaust system and forcing air through the venturi to create suction for drawing exhaust gases away from the exhaust system. The exhaust system of a conventional automobile is modified by coupling one end of an air directing pipe to the tailpipe of the automobile near the outlet of the tailpipe and at an acute angle thereto for creating a venturi. Air is forced into the opposite end of the air directing pipe by an air scoop or a fan, and the forced air is directed through the outlet of the tailpipe for providing suction which draws exhaust gases out of the tailpipe.

High pressure snow gun

Abstract: A snow gun for making artificial snow by atomizing a mixture of air and water is disclosed. The snow gun comprises a hollow body, a compressed air supply conduit terminated by an injection nozzle accommodated inside the hollow body and opening at an end into the hollow body. A pressurized water supply conduit opens into a space between the hollow body and the air supply conduit. A mixing chamber for mixing air and water communicates through an inlet port with the interior of the hollow body, the inlet port facing the discharge nozzle of the injection nozzle. The injection nozzle is displaceable longitudinally relative to the inlet port of the mixing chamber for adjusting the water flow passage to the mixing chamber. A needle valve adjusts the cross-sectional area of discharge orifice of the air injection nozzle. The mixing chamber comprises the bore of a main nozzle extending in the continuation of the injection nozzle. A divergent nozzle extends from the discharge end of the bore and opens to the surrounding air.

Electronic type air/fuel ratio control system

Abstract: An electronic type air/fuel ratio control system for use in gasoline engines comprises an accelerator, a detector of the manipulation angle of the accelerator, a shunt conduit by-passing a throttle valve, an air by-pass valve exposed in the shunt conduit for controlling flow rate of by-pass air, and a control circuit. The control circuit is responsive to the output of the accelerator manipulation angle detector and generates a control signal for the air by-pass valve, whereby the air/fuel ratio can be controlled with high accuracy when the flow rate of air is low.

Apparatus for supplying a fuel/air mixture to an internal combustion engine

Abstract: Apparatus for producing a combustible fuel/air mixture in which the fuel is completely vaporized for operating an internal combustion engine. Exhaust gases from the engine (40) pass through a heating manifold (8) in a vaporization chamber (2) to raise the temperature of a body of volatile liquid fuel in the bottom of the chamber. An air stream is also heated by passing it in heat exchange relation with hot exhaust gases from the engine. The stream of heated air is then drawn through an enclosed vapor space (6) at the top of the vaporization chamber, and fuel vapors are entrained therein. The fuel vapor-containing air stream is then mixed with additional air in a mixing chamber (26) to produce a combustible fuel/air mixture which is conveyed to the intake manifold (38) of the engine. Safety screens (64) are provided to prevent entry of sparks or flame into the fuel chamber.

Gasoline containing exhaust emission reducing additives

Abstract: Exhaust hydrocarbon emissions from an internal combustion engine being operated on gasoline containing a cyclopentadienyl manganese antiknock are reduced by the addition of an exhaust emission reducing amount of a polyester of a polymerized carboxylic acid to the gasoline.

Combustion control device for nozzle spray type burner

Abstract: An improved nozzle spray type burner including a combustion chamber, a housing having an exhaust passage coupled to the combustion chamber, a fan mounted in the housing for directing air through the exhaust passage to the combustion chamber and a fuel spray nozzle in the exhaust passage for spraying fuel into the flow of air in the exhaust passage. The improvement includes a first mechanism associated with the fan to control the flow rate of air in the exhaust passage, and a second mechanism associated with the nozzle for controlling the amount of fuel sprayed from the nozzle. The first and second mechanisms are arranged to cooperate to control the degree of combustion of the fuel with the air in the combustion chamber.

Emission control of two-stroke motorcycle engines by the butterfly exhaust valve

Abstract: This paper discusses the butterfly exhaust valve system installed on the Yamaha RD400 Daytona Special, which is the only two-stroke cycle engine motorcycle in the controlled 400cc class. The paper also refers to the structure of the valve system and the principle of valve operation, as well as its effects on reducing exhaust emissions, improving brake specific fuel consumption, and increasing engine power at part-throttle.

Apparatus for controlling recirculated exhaust gas quantities in self-igniting internal combustion engines

Abstract: An apparatus is described for controlling recirculated exhaust gas quantities in self-igniting internal combustion engines which have a fuel injection pump Two parameters, the rpm (preferably via the rpm-dependent suction chamber pressure) and the position of the quantity-adjusting device, are obtained from the fuel injection pump and delivered to a performance-graph memory in which a control value for the recirculated exhaust gas quantity is stored in accordance with these parameters A recirculated exhaust gas quantity control device is actuated in accordance with the recalled control value

Apparatus for controlling the exhaust gas recirculation rate in an internal combustion engine

Abstract: An apparatus is proposed for controlling the exhaust recirculation rate in an internal combustion engine, in particular an engine with auto-ignition, which includes preferably one mixture valve in the area of the discharge opening of the exhaust recirculation line and which is characterized in that the control is accomplished via the mixture valve position ahead of the inlet valves in accordance with the concentration of at least one component of the air-exhaust gas mixture and/or at least one component of the exhaust gas. Thus it is possible to operate the engine with a relatively emission-free exhaust. An exhaust gas reservoir is further provided, with which peaks in the exhaust gas concentration due to a dynamic driving mode can be intercepted. Finally, it is also proposed that the exhaust recirculation be realized solely via a pressure, which can be controlled in open-loop or closed-loop fashion, in the exhaust line by means of a valve.

Combustor air grid

Abstract: A combustor grid for use in an incinerator having air bars for distribution of fluidizing air. Air is distributed from a source of pressurized air to a configuration of air bars in fluid communication with each other. Each air bar in the grid has an upper surface with air injection ports and side walls which converge toward the bottom surface. The air injectors may be refractory covered metal tubes on a conduit or individual air nozzles.

Device for controlling primary and secondary air/fuel ratios for internal combustion engine

Abstract: An internal combustion engine has an exhaust manifold, an inlet manifold, and a carburetor which has a fuel jet. An oxygen sensor is mounted within the exhaust manifold, and produces an output signal according to the oxygen present within the exhaust gases. A computing means computes a corrective signal according to the oxygen sensor output signal. This corrective signal is fed as an input signal both to a means for supplying secondary air into the exhaust manifold, and also to a means for supplying bleed air to the jet of the carburetor. In a particular embodiment, a secondary air signal cutoff device selectively intercepts supply of the corrective signal to the secondary air supply means, and an air bleed signal cutoff device selectively intercepts the supply of the corrective signal to the air bleed supply means. These cutoff devices may be controlled according to vehicle road speed, engine temperature, engine rotational speed, inlet manifold vacuum, and the temperature of a catalytic converter. The corrective signal may be a duty ratio coded pulse signal.

System and method for controlling exhaust gas recirculation

Abstract: An exhaust gas recirculation control system for an internal combustion engine of a motor vehicle, comprising an exhaust gas recirculation control valve for controlling exhaust gas recirculated back to the engine when opened, and means for fully opening the exhaust gas recirculation control valve for a predetermined period of time when operating condition of the vehicle reaches a predetermined level, thereby preventing exhaust gas recirculation from performing with a delayed time relative to a required timing.

Solenoid valve controlled fuel injection pump

Abstract: A separate valve, rotatable with a pump control valve in a multiple plunger type fuel injection pump used to sequentially supply fuel to a number of fuel injection nozzles, is actuated by a solenoid to control fuel spill from each plunger whereby to control quantity and timing of injection.

Exhaust gas purification apparatus for an internal combustion engine of motor vehicles

Abstract: An exhaust gas purification apparatus for an internal combustion engine including a catalyst chamber containing a catalyst composition for the catalytic conversion of harmful substances contained in the exhaust gases wherein the interior wall of the exhaust pipe connecting the engine with the catalyst chamber is provided with a catalytically active coating for at least a portion of its length.

Method and apparatus for recirculating exhaust gases in diesel engine

Abstract: An exhaust gas recirculation apparatus for diesel engines includes an exhaust gas recirculation passage for recirculating exhaust gases from an exhaust pipe to an intake pipe, a valve body for controlling the cross sectional area of the recirculation passage and a pressure regulator for detecting an amount of fuel injection and to output a signal A diaphragm device is operatively connected to the pressure regulator to receive a pressure signal to control the position of the valve body, whereby in response to an increase of fuel injection the cross sectional area of the recirculation passage is decreased

Exhaust bypass type turbo-charger

Abstract: An exhaust bypass type turbo-charger includes a turbine driven by an exhaust gas from an internal combustion engine, a compressor driven by the turbine and supplying a compressed air into the engine, an exhaust bypass valve for controlling an amount of the exhaust gas bypassing the turbine, a drive mechanism for fluidly driving the exhaust bypass valve, and a transducer. The transducer communicated fluidly with both the drive mechanism and an outlet of the compressor, and amplifies the pressure variation of air discharged from the compressor so that the amplified pressure variation is applied in the drive mechanism. The drive mechanism, therefore, can start to open the exhaust bypass valve at a relatively smaller pressure, and fully open it at a relatively larger pressure.