| 摘要 |
<p>PURPOSE:To prevent injury caused melting of a trap which collects particulates in exhaust gas by opening a trap bypass passage when the temperature of exhaust gas at the inlet of the trap exceeds a set value at a specified rate or more during a specified period and when the concentration of oxygen in exhaust gas is increased. CONSTITUTION:A trap which collects particulates within exhaust gas is provided in the exhaust pipe 3 of a Diesel engine 11 and a particulate burning heater 5 is mounted at the upstream side of the trap. Based on a negative pressure signal Sv, a suction throttle valve opening signal Sd, a water temperature signal St, a load signal Sl, a revolution speed signal Sn and so on, a controller 25, at the regenerating time of the trap, electrifies and heats the heater 5 and opens an opening and closing valve 15 which is disposed in a trap bypass passage 13. In addition, based on an inflow gas temperature signal Se sent from an exhaust temperature sensor 51 and a signal Sa informing any increase of 02 concentration, the controller 25 opens, regardless of the regeneration required, the opening and closing valve 15 when the temperature of the inflow gas exceeds a set value at a specified rate or more during a specified period and when the concentration of 02 within exhaust gas is increased.</p> |
