Patent ID: 9574489
Date: 2017-02-21
CPC Classifications: F02B,Y02T

Claim:
1. A method for controlling a multi-stage turbocharger system of an internal combustion engine with an intake manifold, comprising: sensing a first boost pressure in a cold pipe that extends between a first turbocharger and a second turbocharger with a sensor disposed within the cold pipe, the first boost pressure corresponding to a boosted output of the first turbocharger; sensing a second boost pressure corresponding to an output of the second turbocharger, the first and second turbochargers being disposed in series and the second turbocharger further compressing the output of the first turbocharger; determining a target boost pressure ratio of the lower first boost pressure to the higher second boost pressure using a computerized controller having a processor and system memory, wherein the controller does not regulate an overall manifold pressure at the intake manifold; operating the engine over a range of operating parameters, the operating parameters changing at least one of the first and second boost pressures; and adjusting operation of at least one of the first and second turbochargers by the controller during operation of the engine to modify at least one of the first and second boost pressures toward maintaining the target boost pressure ratio.