| 摘要 |
<p>PURPOSE:To improve regenerating performance by supplying one side of a scavenging filter with air required for regeneration of the scavenging filter through an air supply means, by measuring differential pressure between before and after the scavenging filter at that time, and by adjusting it so that a value of the differential pressure is kept almost constant by an air flow rate control means. CONSTITUTION:In regeneration of a filter 3, an exhaust gas is emitted to outside through a bypass passage 8 on which a three-way valve 12 is opened, and a pipe 15 for emitting combustion gas at regeneration is made to communicate to an inlet side of a cylinder 4 through a three-way valve 11. And air is supplied to the filter 3 from an air pump 17 connected to the rear part of the cylinder 4 by an air introduction pipe 16, electric current is applied to an electric heater 7' on the rear end of the filter 3 so as to burn out and eliminate an accumulated particulate 6, and regenerated exhaust gas is emitted from a pipe 15. In this regenerated, a signal and so on of a detecting means 21 for differential pressure are put into a control means 20, a flow passage opening degree regulating valve 18 provided at a part of the front of the cylinder 4 is opened by an actuator 19 and an air supply amount is controlled of so that the differential pressure P across the filter 3 is kept constant.</p> |
