Patent ID: 8683791
Filing Date: 2014-04-01
Classification: F01N

Abstract:
1. An exhaust system comprising: a swirl inducement unit including a plurality of vanes and a pipe section, with the pipe section configured for an exhaust from an engine to pass therethrough and having a completely open central portion, each of the plurality of vanes having a first end connected to the pipe section and a second end extending away from the first end in a direction towards the completely open central portion, each of the plurality of vanes being rotatable about a corresponding axis to increase or decrease a surface area of the plurality of vanes relative to a directional flow of the exhaust through the pipe section, the plurality of vanes being configured to substantially homogenize the exhaust when the exhaust passes through the pipe section to thereby produce a substantially homogenized exhaust; an air-to-fuel ratio sensor configured to detect an air-to-fuel ratio of the substantially homogenized exhaust produced by the swirl inducement unit; and an electronic control unit configured to: rotate each of the plurality of vanes about the corresponding axis of the vane to thereby increase the surface area of the plurality of vanes relative to the directional flow of the exhaust through the pipe section when there is a relative decrease in the directional flow of the exhaust.