METHOD FOR UTILIZING CONDENSATE TO IMPROVE ENGINE EFFICIENCY

摘要

Methods are provided for controlling a vehicle engine to improve engine efficiency utilizing onboard water condensate. In one example, condensate is collected from cooling air routed into an engine, and injected into one of a plurality of locations based on engine operating conditions to keep NOx in combustion gases below desired amounts and to avoid ignition knock in said engine. In this way, condensate build-up in the CAC is advantageously utilized, engine performance and efficiency may be improved, and harmful emissions may be reduced.

主权项

1. A method comprising:
collecting condensate from cooling air routed into an engine; routing said condensate into the engine via one of a plurality of locations based on operating conditions of said engine; determining a desired percentage of dilution for combustion in said engine based on said operating conditions; and adjusting said condensate injection and adjusting recirculation of exhaust gases from said engine to form said desired dilution based in part on said injection location.