| 摘要 |
<p>A system and method for controlling an internal combustion engine to reduce or eliminate formation of EGR condensate is disclosed. Said method comprises monitoring current ambient 200 and engine operating conditions 210 and determining whether conditions are favourable for condensation of the EGR gases 222. If said conditions are favourable the engine is controlled accordingly 228 to avoid condensation; preferably by increasing the intake manifold temperature. The intake manifold temperature may be increased by redirecting some or all of the EGR flow 230 to avoid an EGR cooler. Alternatively, or in combination, some or all of the charge air may be redirected 232 to bypass the charge air cooler and/ or redirected from the outlet of a turbocharger compressor to the intake, effectively increasing the intake air temperature and resulting in a corresponding increase of the intake manifold temperature. Conditions favourable for condensation may be determined based on engine speed and load 214, ambient temperature 202, manifold pressure 216, scheduled or actual EGR flow rate 218 and scheduled or actual air/fuel ratio 220.</p> |
