Abstract: An exhaust pressure regulating system for use with an exhaust gas recirculating system of an internal combustion engine, and particularly for an automobile, utilizing a control valve of the butterfly or poppet type in the exhaust pipe for adjusting the back pressure in the exhaust, a vacuum-sensitive device for actuating the control valve, a pressure-signal passage for applying the pressure in the intake manifold to the vacuum-sensitive device and a pressure-comparing valve sensitive to the quantity of air being taken into the engine and the adjusted back pressure in the exhaust for modulating the pressure in the pressure-signal passage.

Abstract: An apparatus for recirculating exhaust gases to an intake or suction system through an exhaust gas recirculating valve means to be operated in response to negative pressure in the suction system in an internal combustion engine, which comprises a second control valve means connected to a first control valve means of said recirculating valve device to respond to the negative pressure in an intake pipe to control the opening of the first control valve means in response to the load, whereby the proportion of an inert gas contained in an engine cylinder is made substantially constant in the partial load operation region.

Abstract: Disclosed is an improvement of an exhaust gas purifying device for use with an internal combustion engine incorporating both an exhaust gas recirculation system and a secondary air supply system, the improvement comprising variable restriction means disposed in an exhaust pipe downstream of an exhaust gas intake port of the exhaust gas recirculation system for varying the flow cross sectional area of the exhaust pipe and control means responsive to the difference between the signal representative of the volume of exhaust gas and the signal representative of the volume of intake air for controlling the variable restriction means in such a way that the former signal may be proportional to the latter signal, whereby the volume of exhaust gas to be recirculated may be made optimumly proportional to the volume of intake air independently of the variation in rotational speed and load of the engine.

Abstract: A system for supplying secondary air into an exhaust system of an internal combustion engine in a manner such that the amount of secondary air is proportional to the engine intake air. The supply of the secondary air is controlled by a valve member which is biased in response to a balance between a venturi vacuum and the exhaust gas pressure until a predetermined ratio of the venturi vacuum to the exhaust gas is obtained.

Abstract: A catalyst container for use in an exhaust manifold, which container includes perforated inner and outer cylinders and is positioned within the exhaust manifold, in the position of its exit, with catalysts filled in a cylindrical space defined between the inner cylinder and outer cylinder. In this catalyst container, annular openings in the cylindrical space at its top and bottom ends are covered with annular upper and lower lids, respectively, while a circular, inner cylinder lid is placed over the top opening of the inner cylinder to cover it. In addition, an outer cylinder lid is placed on the top circumferential edge of the outer cylinder in a manner to cover the top opening of the outer cylinder as well as the circular, inner cylinder lid. The catalysts are filled in a first space defined by the inner cylinder lid and the outer cylinder lid as well as in a second space defined between the outer cylinder and the inner cylinder.

Abstract: An exhaust gas recirculation system (EGR system) with an EGR valve means for controlling the amount of the exhaust gas to be recirculated into an intake system in an internal combustion engine, said EGR valve means comprising an intake system vacuum operated valve means for controlling the amount of the recirculated exhaust gas and a vacuum pump operated valve means for additionally controlling the amount of the recirculated exhaust gas. The EGR system preferably further comprises means for stopping EGR operations when not required and means for adjusting a required ignition timing.

Abstract: A back pressure-controlled EGR system in an internal combustion engine comprising an EGR valve means with a pressure control chamber disposed in an EGR conduit connecting an exhaust pipe to an intake pipe of the engine, and a back pressure transducer having a sub-atmospheric pressure chamber connected to said EGR valve means and having a pressure operation chamber connected to said pressure control chamber, said sub-atmospheric chamber being connected to the atmospheric air via an air bleed passage which is connected to a venturi portion of a carburetor via a branch pipe.

Abstract: An internal combustion engine having a main combustion chamber and an auxiliary combustion chamber having an opening in communication with the main combustion chamber is provided with a first spark plug in the auxiliary combustion chamber and a second spark plug in the main combustion chamber. The first and second spark plugs are used selectively to insure ignition in all operational ranges and all external conditions of the engine.

Abstract: An apparatus for recirculating exhaust gases, wherein an exhaust gas recirculating passage provides communication between the intake and exhaust passages of an internal combustion engine. A constriction is provided in the passage, and a control valve is provided in the passage downstream of the constriction. A negative control pressure passage introduces a negative control pressure from a port in the intake passage to the control valve. A pressure chamber is interposed between the constriction and the control valve, which pressure chamber has a pressure therein which is substantially equal to atmospheric pressure when the control valve is opened and to that in the exhaust passage when the control valve is closed. A first operating valve opens the negative control pressure passage to the atmosphere when the pressure in the pressure chamber becomes substantially atmospheric.

Abstract: An exhaust gas recirculator wherein a double diaphragm type flow control valve is disposed in a recirculating passage which couples an exhaust system and an intake or suction system of an internal combustion engine. The flow control valve includes first and second diaphragms, and is formed with a first pressure control chamber partitioned by a first diaphragm and a second pressure control chamber partitioned by the first diaphragm and a second diaphragm. Vacuum is introduced into the first and second pressure control chambers from vacuum ports provided in the vicinity of a throttle valve of a carburetor. Thus, the stroke of a valve shaft of the flow control valve and accordingly the opposing area between a valve body and valve seat of the flow control valve are controlled in two stages, so that the single flow control valve can control the amount of recirculative exhaust gas in two stages.

Abstract: An exhaust gas purifier in an internal combustion engine having a plurality of cylinders and two separate exhaust manifolds. Two separate exhaust pipes are connected to the corresponding exhaust manifolds, one of the exhaust pipes being joined with the other exhaust pipe. The recirculated exhaust gas is extracted from the one exhaust pipe and is delivered into the air intake system. Secondary air is fed into the other exhaust manifold.

Abstract: An exhaust gas recirculating system including two flow rate control valves which are actuated by means of diaphragms. The negative pressure in the intake system of an engine is independently introduced into diaphragm chambers of the aforesaid two flow rate control valves. Thus, the total quantity of recirculating gases is controlled by taking as a reference the quantity of the recirculating exhaust gases being introduced into a first flow rate control valve and adding to the aforesaid reference quantity the quantity of the recirculating exhaust gases being introduced into a second flow rate control valve.

Abstract: An exhaust gas re-circulation system for an internal combustion engine is provided with a single flow-control valve for regulating the flow of the re-circulating exhaust gas which is re-introduced from an exhaust system of the engine into an intake system of the engine in a two step-like manner, depending upon change in the state of operation of the internal combustion engine and/or change in the operating condition of said internal combustion engine.

Abstract: In a carburetor, a branch passage is connected to the fuel-air mixture passage for charging exhaust gases back into the fuel-air mixture. A control valve is positioned in the branch passage for regulating flow of the exhaust gases and a first spring biases the control valve into the closed position. A throttle valve in the fuel-air mixture passage is operatively coupled to the control valve by a linkage arrangement so that the two valves can be operated together. The linkage arrangement includes a second spring which permits movement of the throttle valve without corresponding movement of the control valve. Further, the linking arrangement provides a certain amount of play between the movement of the throttle valve and the control valve so that the operation of the control valve can be delayed relative to the opening movement of the throttle valve.

Abstract: An internal combustion engine exhaust manifold with cylindrical built-in catalyst container which comprises cylindrical inner and outer cylinders and annular lids fitting at opposite ends thereof and is filled with a catalyst suitable for cleaning the engine exhaust.An exhaust gas cleaning device using the exhaust manifold comprises an oxygen concentration sensor located in the exhaust gas flow and an electronic fuel injector for performing feedback control in accordance with a signal from the oxygen concentration sensor.

Abstract: A control system for controlling the opening of a throttle valve of a vehicle comprises a throttle valve actuating mechanism and a diaphragm apparatus including a diaphragm member which divides the casing of the diaphragm apparatus into two chambers, the first chamber being communicated through an orifice and air chamber with an intake manifold leading to an engine while the second chamber being communicated directly with the intake manifold.When a vehicle is decelerated, the vacuum in the intake manifold is increased with the result that the vacuum in the second chamber is increased while the vacuum in the first chamber does not increase, because of the presence of the orifice and air chamber so that the vacuum in the second chamber will become higher than that in the first chamber, pulling the diaphragm member toward the second chamber, which drives the throttle valve actuating mechanism to actuate the throttle valve to open to feed more air fuel mixture, thus preventing misfire.

Abstract: An exhaust gas control valve adapted for controlling exhaust gas flow returning to the upstream side of a carburetor from an exhaust line of a vehicle engine. The control valve comprises a means for reducing or stopping the returning exhaust gas when ambient temperature is very low, whereby so called carburetor icing is avoided.

Abstract: In an carburetor where a shaft is positioned within a bearing section and there is no lubricant, such as oil or water, used between the shaft and bearing section, a flow of pressurized air is directed through a passageway into the bearing section and then into a slot which extends in the circumferential direction so that air can be directed axially between the shaft and the bearing section. The flow of air prevents the entry of any alien substances, such as dust or moisture, into the space between the shaft and the bearing section.

Abstract: Herein disclosed is a flow control valve assembly for use in an exhaust gas recirculation system in which engine exhaust gases are recirculated from the exhaust system to the intake system of an internal combustion engine so as to clean the engine exhaust gases. The flow control valve assembly comprises a first valve interposed between its inlet and outlet ports for regulating its effective area for the exhaust gases. The first valve includes an orifice, a valve seat, a constant-pressure chamber defined inbetween, and a valve member movable between a seated position and an open position. The control valve assembly further comprises diaphragm means for acutating the valve member and including a diaphragm connected to the valve member, a diaphragm chamber having fluid communication with an air source under pressure, and an air bleed hole formed in the diaphragm.