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An exhaust gas purifying system for use in an internal combustion engine for controlling the air injection into an exhaust manifold and the circulation of exhaust gases from the exhaust manifold to a suction pipe, due to a negative pressure prevailing in the suction pipe, in which the negative press

An exhaust gas purifying system for use in an internal combustion engine for controlling the air injection into an exhaust manifold and the circulation of exhaust gases from the exhaust manifold to a suction pipe, due to a negative pressure prevailing in the suction pipe, in which the negative pressure varies depending on the running conditions of the engine.

대표청구항 ▼

An exhaust gas purifying system for use in an internal combustion engine, which is provided with an air cleaner, a suction pipe connected to said air cleaner, a choke valve and a throttle valve provided in said suction pipe and means for attaching the throttle valve for movement within the suction p

An exhaust gas purifying system for use in an internal combustion engine, which is provided with an air cleaner, a suction pipe connected to said air cleaner, a choke valve and a throttle valve provided in said suction pipe and means for attaching the throttle valve for movement within the suction pipe, an exhaust manifold and a catalyst converter connected to said manifold, the throttle valve having an idle opening position at which the throttle valve is substantially closed and the engine is in the condition of normal idle running, the throttle valve also having a throttle opening position wherein the throttle valve is substantially open, comprising: a first port provided between the idlE opening position of said throttle valve in said suction pipe and the throttle opening position; a second port provided in said throttle opening position of said throttle valve in said suction pipe; a third port provided on the upstream side but in the vicinity of means for attaching the throttle valve in said suction pipe; a vacuum ignition advancer adapted to be operated due to a negative pressure introduced through said first port; a throttle positioner adapted to be operated due to negative pressure introduced through said second port for temporarily preventing the throttle valve from assuming the idle opening position; a choke opener adapted to be operated due to a negative pressure on the downstream side of said suction pipe and a fast idle device; means for introducing the negative pressure prevailing on the downstream side of said suction pipe, to said choke opener and said fast idle device; means for controlling the introduction of the negative pressure to the fast idle device according to the temperature at said internal combustion engine; an air switching device provided with first and second valves; an air feed pipe connecting said air switching device to said air cleaner; a pipe for feeding back air from said air cleaner through said first valve to said air cleaner therethrough; a pipe for feeding air from said air cleaner by way of said first and second valves to said exhaust manifold therethrough; a pipe for feeding air from said air cleaner by way of said first and second valves to said catalyst convertor; a first diaphragm mechanism for actuating said first valve; a second diaphragm mechanism provided with a diaphragm having an orifice therein, and first and second diaphragm chambers positioned on the opposite sides of said diaphragm; means for introducing a negative pressure prevailing on the downstream side of said suction pipe to the diaphragm chamber in said first diaphragm mechanism; means for controlling the introduction of a negative pressure to said diaphragm chamber in said first diaphragm mechanism according to the negative pressure fed through said third port as well as to the temperature of said internal valves; an air feed pipe connecting said air switching device to said air cleaner; a pipe for feeding back air from said air cleaner through said first valve to said air cleaner therethrough; a pipe for feeding air from said air cleaner by way of said first and second valves to said exhaust manifold therethrough; a pipe for feeding air from said air cleaner by way of said first and second valves to said catalyst convertor; a first diaphragm mechanism for actuating said first valve. a second diaphragm mechanism provided with a diaphragm having an orifice therein, and first and second diaphragm chambers positioned on the opposite sides of said diaphragm; means for introducing a negative pressure prevailing on the downstream side of said suction pipe to the diaphragm chamber in said first diaphragm mechanism; means for controlling the introduction of a negative pressure to said diaphragm chamber in said first diaphragm mechanism according to the negative pressure fed through said third port as well as to the temperature of said internal combustion engine; means for controlling the pressure in the second diaphragm chamber in said second diaphragm mechanism according to the negative pressure introduced through said second opening as well as to the temperature at said internal combustion engine; and means for introducing a negative pressure prevailing on the downstream side of said suction pipe to said first diaphragm chamber in said second diaphragm mechanism.