Patent ID: 7640794
Filing Date: 2010-01-05
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method of operating an engine system including an engine having a first air intake passage branch including a first compression device and a second air intake passage branch including a second compression device, wherein each of the first branch and the second branch are fluidly coupled to at least a combustion chamber of the engine via a common intake passage, a first sensor arranged along the first air intake passage branch and at least a second sensor arranged along the common intake passage, wherein the first sensor is a mass airflow sensor and wherein the branch does not include a mass airflow sensor, the method comprising: increasing mass airflow through the first air intake passage branch relative to mass airflow through the second air intake passage branch when an amount of decrease in the mass airflow through the first air intake passage branch is more than half an amount of a corresponding decrease in a combined first air intake passage branch mass airflow and second air intake passage branch mass airflow; and indicating degradation of the first compression device or of the second compression device.