Secondary air supply system for internal combustion engines
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorNorio Shibata
Life of this patent
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Abstract
A non-return air flow system for supplying secondary air into the exhaust system of internal combustion engines by utilizing pulsating flow of exhaust gases in the exhaust system, wherein the critical valve opening pressure for a check valve incorporated in the non-return system is varied in accordance with intake air flow rate of the engine so that supply of secondary air is effected in proportion to air intake of the engine.
Claims8
A secondary air supply system for an internal combustion engine comprising a passage means for conducting secondary air to the exhaust system of the engine, and a check valve provided in the midst of said passage means for allowing air to flow only toward said exhaust system, said check valve comprising a valve element which opens the valve when air pressure difference above a predetermined level exists across the valve and a control means which controls said predetermined level in accordance with intake air flow rate of the engine in a manner to lower said level as the intake air flow rate increases.
Dependencies are inferred from the claim text.