ULTRA LOW EMISSION GAS ENGINE AND ITS FUEL QUANTITY CONTROL METHOD

摘要

The present invention relates to an ultralow-emission gas engine comprising: an engine body (10); an exhaust pipe (20) connected to the engine body (10); a first three-way catalyst (30) installed on the exhaust pipe (20); a first oxygen sensor (40) installed on the exhaust pipe (20) to be positioned in front of the first three-way catalyst (30); a second oxygen sensor (50) installed on the exhaust pipe (20) to be positioned behind the first three-way catalyst (30); a nitrogen oxide (NOx) sensor (60) installed on the exhaust pipe (20) to be positioned behind the second oxygen sensor (50); and a controller (70) electrically connected to the first and the second oxygen sensor (40, 50) and the NOx sensor (60) to calculate a fuel amount of a theoretical air-fuel ratio based on output values detected in real time from the first and the second oxygen sensor (40, 50) and the NOx sensor (60) to correct and control a fuel amount supplied to the engine body (10). Accordingly, the functionality and usability of the ultralow-emission gas engine can be improved.