CONDENSATION CONTROL METHOD AND SYSTEM FOR INTERNAL COMBUSTION ENGINE USING EGR

PROBLEM TO BE SOLVED: To provide a system and a method for controlling an internal combustion engine so as to prevent condensation by monitoring current atmospheric conditions and operating conditions, determining whether or not the conditions are favorable for EGR gas condensation, and preferably raising intake manifold temperature. SOLUTION: The intake manifold temperature may be increased by redirecting some or all of the EGR flow to avoid the EGR cooler. Alternatively, or in combination, some or all of the charge air may be redirected to bypass the charge air cooler and/or directed from the outlet of the turbocharger compressor to the intake, effectively increasing the intake air temperature and resulting in a corresponding increase of the intake manifold temperature. Conditions favorable for condensation may be determined based on engine speed and load, atmospheric temperature, manifold pressure, scheduled or actual EGR flow rate and scheduled or actual air/fuel ratio. COPYRIGHT: (C)2003,JPO