Abstract: A trapper apparatus arranged in the exhaust line of a diesel engine, provided with a pair of transversely separated trapper units and with a valve plate arranged before units for selectively introducing the exhaust gas from the engine into one of the units. The valve plate is further provided with a pair of fuel injection nozzles each of which is adapted for communicating a common fuel inlet with one of the trapper units which is closed by the valve plate.

Abstract: In an exhaust gas recirculation system adapted to an internal combustion engine, the system comprises a servomotor to be operated by pneumatic pressure and a control valve actuated by the servomotor to control the quantity of exhaust gases recirculated into an intake manifold from an exhaust pipe. The pneumatic pressure applied to the servomotor is electrically controlled without undesired errors to satisfy the following function in relation to the engine intake manifold vacuum and the engine speed:Pe=f(Pv, N)where Pe is the pneumatic pressure applied to the servomotor, Pv and N respectively indicate the engine intake manifold vacuum and the engine speed.

Abstract: In a carburetor for an internal combustion engine, a control valve is disposed with an air passage through the carburetor structure to control the flow quantity of air to be mixed with fuel from a float chamber and a pneumatic servo-motor is operatively connected with the control valve to control the opening degree of the valve. The pneumatic pressure applied to the servo-motor is electrically controlled to satisfy the following function in relation to the engine intake manifold vacuum and the engine speed.Pd=f(Pv, N)where the character Pd is the pneumatic pressure applied to the servo-motor, and the characters Pv and N respectively indicate the engine intake manifold vacuum and the engine speed.

Abstract: In a carburetor and an exhaust gas recirculation system adapted to an internal combustion engine, the system comprises a first servomotor to be operated by pneumatic pressure and a first control valve actuated by the first servomotor to control the quantity of exhaust gases recirculated into an intake manifold from an exhaust pipe, and the carburetor comprises a second servomotor to be operated by pneumatic pressure and a second control valve actuated by the second servomotor to control the flow quantity of air to be mixed with fuel from a float chamber. The pneumatic pressure applied to the first and second servomotors is electrically controlled to satisfy the following function in relation to the engine intake manifold vacuum and the engine speed.Pe=f(Pv, N)where Pe is the pneumatic pressure applied to the servomotors, Pv and N respectively indicate the engine intake manifold vacuum and the engine speed.

Abstract: In an exhaust gas recirculation system for an internal combustion engine, a flow control valve is disposed within a recirculation pipe and operatively connected to a pneumatically operated servomotor to control the flow quantity of exhaust gases through the recirculation pipe, and an orifice is disposed within the recirculation pipe upstream of the valve to form a space between the valve and the orifice. A pressure regulator serves to modulate negative pressure from an engine intake manifold to the servomotor on a basis of pneumatic pressure applied thereto and pressure in the space. The pneumatic pressure applied to the pressure regulator is electrically controlled to satisfy the following equation.Pd=f(Pv, N)where the character Pd is the pneumatic pressure applied to the pressure regulator, and the characters Pv and N respectively indicate the negative pressure in the intake manifold and the engine speed.

Abstract: In an exhaust gas recirculation system for an internal combustion engine, the flow quantity of exhaust gases recirculated from an exhaust pipe into an induction pipe through a recirculation pipe is controlled in relation to exhaust pressure in the recirculation pipe in accordance with pneumatic pressure defined by a value calculated in a digital computer taking account of negative pressure in the induction pipe and rotational speed of the engine.

Abstract: Disclosed is a method for controlling the ignition timing in an internal combustion engine provided with an EGR device. In this method, the correct EGR ratio of the engine is obtained by means of a specific calculation using a measured absolute pressure value in an intake manifold of the engine where EGR gas is recirculated and using a calculated absolute pressure value in the intake manifold where no EGR gas is recirculated, according to the engine's operating conditions. The optimum ignition timing in the engine is controlled in accordance with the calculated EGR ratio.

Abstract: An exhaust gas recirculation control system for an internal combustion engine wherein the control is effected so as to accord intake manifold pressure of the engine to target values predetermined for various operating conditions of the engine and retained in a memory means, wherein the target values are modified in accordance with atmospheric pressure to a compensater for the reduction in atmospheric pressure at high altitutde and to modify the ratio of exhaust gas recirculation in operation of the engine at high altitude when compared with its operation at sea level.

Abstract: Disclosed is an EGR system of an internal combustion engine, in which a part of the exhaust gas is drawn out from an exhaust pipe and returned to an intake pipe through a control valve, and a reference pressure in the intake pipe corresponding to the amount of recirculated exhaust gas, predetermined by experiment (beforehand) in various combinations of engine intake air flow and speed, is memorized in a memorizing device. The reference pressure responding to the amount of sucked air being introduced into the engine and the engine rotating speed in the case of actual operation of the engine is read out from the memorizing device and, then, compared with the real pressure in the intake pipe in the case of actual operation of the engine.

Abstract: Disclosed herein is a computer control system of an exhaust gas recirculation device for an internal combustion engine, wherein values of the parameters of desired EGR ratios when various conditions in the engine intake system exist are preliminarily stored in the memory of the computer, and wherein a value of a parameter is read out from the memory by detecting a value of the engine condition during its operation. In the system, values of temperature correction factors with respect to at least one temperature characteristic of the engine are also preliminarily stored in the memory. A temperature correction value is read out from the memory in accordance with a detected temperature value of at least one portion of the engine. The computer calculates the amount of EGR needed from the read out values of desired EGR and temperature correction and produces an electrical signal for controlling operation of the EGR value.

Abstract: An exhaust gas recirculation control system for an internal combustion engine including a diaphragm type exhaust gas recirculation control valve provided at a middle portion of a passage for conducting exhaust gases to be recirculated, the control valve being controlled by the fluid pressure supplied to its diaphragm chamber, wherein the fluid pressure is controlled to accord with a target value prepared to provide the optimum exhaust gas recirculation in various operating conditions of the engine and selected in accordance wtih the current operating conditions of the engine.

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 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.