Patent ID: 7735320
Filing Date: 2010-06-15
Classification: F01N,F02B,F02D,Y02T

Abstract:
1. A control system for a dual stage turbo having a variable geometry turbine (VGT) and a fixed geometry turbine (FGT), comprising: a control module that generates a turbo control signal based on intake manifold pressure and a desired value of said intake manifold pressure; a variable geometry turbine (VGT) module that generates a VGT control signal to actuate vanes in the VGT based on said turbo control signal, wherein said VGT control signal actuates said vanes between a first vane position and a second vane position as the intake manifold pressure increases, and wherein said second vane position is a fully opened vane position; and a bypass valve module that generates a bypass control signal based on said VGT control signal; when said vanes are at said second vane position and the intake manifold pressure is increasing, said bypass control signal actuates a valve toward an open position to bypass said VGT and directs exhaust gasses to the FGT.