Patent ID: 8752532
Filing Date: 2014-06-17
Classification: F01N,F02D,F02M,Y02T

Abstract:
1. An internal combustion engine using at least one cylinder in a plurality of cylinders as an EGR exclusive cylinder, comprising: an intercooler provided in an intake passage of the internal combustion engine; an upstream-side EGR passage which connects an exhaust port of the EGR exclusive cylinder and the intake passage on the upstream of the intercooler; and a downstream-side EGR passage which connects the exhaust port of the EGR exclusive cylinder and the intake passage on the downstream of the intercooler, wherein lengths of the upstream-side EGR passage and the downstream-side EGR passage are designed such that, assuming that a path from the exhaust port to an intake port of the EGR exclusive cylinder via the upstream-side EGR passage is a first path and a path from the exhaust port to the intake port via the downstream-side EGR passage is a second path, a path difference between the first path and the second path generates a phase difference of 160° to 200° between exhaust gas pulsation via the first path and the exhaust gas pulsation via the second path.