Anti-afterburn system
AssigneeMitsubishi Jidosha Kogyo Kabushiki Kaisha
InventorHiroaki Ono
Life of this patent
Estimating the term…
Abstract
An anti-afterburn system for an engine having an air pump, comprising a pressure differential responsive member defining two chambers, a control valve connected to said member, and at least one orifice provided in one of conduits connecting the chambers with an intake manifold of the engine to operate the control valve upon abrupt pressure variation in the intake manifold thereby preventing afterburn. The system further comprises a thermo valve means which is responsive to overheating of the engine or an exhaust system thereof and adapted to supply a pressure to one of the chambers to operate the control valve, thereby interrupting supply of the secondary air from the pump to prevent damages of a thermal reactor and generation of fire.
Claims5
An anti-afterburn system for an engine having an air pump, comprising a control valve for controlling secondary air supply from said pump to an exhaust system of the engine, a pressure differential responsive member dividing a housing into two chambers and being connected to said control valve, conduits connecting respectively said chambers with an intake manifold of the engine, a first orifice provided in one of said conduits so that said control valve is operated by abrupt variation of a pressure in said intake manifold to interrupt or reduce said secondary air supply, and a thermo valve means having a first chamber defined in a casing and supplied with an air pump pressure, a passage operatively connecting said first chamber with one of said two chambers, a first valve member opening and closing said passage, and a temperature sensing means responsive to a predetermined temperature to move said valve member so as to supply the air pump pressure to said one chamber, thereby operating said control valve to interrupt said secondary air supply, and said thermo valve means comprises a second chamber connected to said one chamber through said passage and to said first chamber which continuously communicates with the air pump pressure, said first valve member being located in said first chamber and normally closing the supply of said air pump pressure to said one chamber through said second chamber, a valve stem being slidably received in said casing adjacent to said sensing means, one end of said stem extending into said second chamber and operatively connected to said first valve member to open the latter when the sensing means senses said predetermined temperature.
An anti-afterburn system for an engine having an air pump, comprising a control valve for controlling secondary air supply from said pump to an exhaust system of the engine, a pressure differential responsive member dividing a housing into two chambers and being connected to said control valve, conduits connecting respectively said chambers with an intake manifold of the engine, a first orifice provided in one of said conduits so that said control valve is operated by abrupt variation of a pressure in said intake manifold to interrupt or reduce said secondary air supply, and a thermo valve means having a first chamber defined in a casing and supplied with an air pump pressure, a passage operatively connecting said first chamber with one of said two chambers, a first valve member opening and closing said passage, and a temperature sensing means responsive to a predetermined temperature to move said valve member so as to supply the air pump pressure to said one chamber, thereby operating said control valve to interrupt said secondary air supply, said first valve member being located in said first chamber and normally closing the supply of said air pump pressure to said one chamber, a valve stem being slidably received in said casing adjacent to said sensing means, one end of said stem operatively connected to said first valve member to open the latter when the sensing means senses said predetermined temperature, wherein a temperature sensing plate is attached to one end of said casing, and a bimetal being located adjacent to an inner surface of said plate and movable into a position in which the bimetal engages with a pin on said stem of said first valve member to open said first valve member when an environmental temperature in an engine room or around the exhaust system exceeds a predetermined temperature.
Dependencies are inferred from the claim text.