Control method for variable geometry turbocharger and related system

Abstract

Control method for variable geometry turbocharger and related system are disclosed, wherein a boost target for a turbocharger is determined. Next, an error value between target boost and actual boost pressure is calculated and utilized to determine a new vane position. For example, the new vane position can be determined by calculating a needed change in vane position from the equation, Δθ=kp(err)+kd·d(err)/dt, where Δθ is the change in vane position, kp is a proportional gain value, kd is a differential gain value, and err is the error value between the boost target and the actual boost. A new vane position for the turbocharger is then determined by summing Δθ with the previous vane position, and the turbocharger's set of vanes is positioned according to the new vane position. An open loop diagnostic mechanism and a feed-forward mechanism can also be employed to enhance vane positioning.

Dependencies are inferred from the claim text.