The Study on the Partial Shut-Down Injection Pump System and Its Effects on the Reduction of the Diesel White Smoke Emission

This paper describes the study on the reduction of white smoke from a six-cylinders, 10.4 liter diesel engine with MAN's M-type combustion system. During cold weather, diesel engines are vulnerable to white smoke problem due to incomplete combustion, especially, immediately after the start or under light load-low speed operation.

In order to alleviate this problem, we have applied the partial fuel shut-down scheme at idle or under light load-low speed run, through the use of modified plungers in the injection pump. The test results showed that the white smoke, total hydrocarbon, aldehyde gas emission were reduced and BSFC was improved with the adoption of the new plunger. Discussion was made on the experimental result and stability of diesel engine at transition point from partial cylinder operation to full cylinder operation