METHODS FOR NOx REDUCTION USING EXHAUST-GAS CONDENSATE

The method of claim 13, wherein condensate is injected in combination with the first portion of the exhaust-gas stream in response to an engine temperature exceeding a second temperature threshold.

A method for an engine, comprising:

• cooling an engine exhaust-gas stream with a cooling unit within a condensate recirculation device coupling an exhaust line to an air intake system;
• collecting condensate from the cooled exhaust-gas stream in a condensate collecting device, and
• introducing the collected condensate into the air intake system to admix with an airflow while admixing recirculated exhaust gas in parallel to the condensate admixing.

A method comprising cooling exhaust gas with a cooler and collecting condensate therein, the condensate directed through a first line and injected to intake air, the first line directing only liquid condensate and not exhaust gas;

• while recirculating exhaust gas through a second line to the intake in parallel with the first line, the second line upstream of the first line, an EGR valve in the second line adjusted responsive to an amount of the liquid injection.