Patent ID: 8033105
Filing Date: 2011-10-11
Classification: F01N,Y02T

Abstract:
1. An internal combustion engine, comprising: an exhaust-gas system including n>1 exhaust-gas flow configurations, n being an integer, said exhaust-gas flow configurations each including at least one catalytic converter; a secondary air supply system including at least one secondary air pump and at least one secondary air valve; said at least one secondary air pump being configured to be fluidly connected, via said at least one secondary air valve, to at most n−1 of said exhaust-gas flow configurations upstream of said at least one catalytic converter of said at most n−1 of said exhaust-gas flow configurations, and remaining ones of said exhaust-gas flow configurations being permanently separated from said secondary air supply system such that no fluid connection can be established between said at least one secondary air pump and said remaining ones of said exhaust-gas flow configurations; said remaining ones of said exhaust-gas flow configurations being configured to never be supplied with secondary air during operation of the internal combustion engine; and said exhaust-gas flow configurations being at least partly separated from one another such that no exhaust-gas is conveyed from a downstream end of said at least one catalytic converter of said remaining ones of said exhaust-gas flow configurations to an upstream end of said at least one catalytic converter of said at most n−1 of said exhaust-gas flow configurations.