Patent ID: 6272859
Filing Date: 2001-08-14
Classification: F02B,F02D,Y02T

Abstract:
An apparatus for controlling a variable geometry turbocharger, comprising:a first sensor operable to provide an engine speed signala second sensor operable to provide a fuel quantity signal;a data processor coupled with the first and second sensors to receive the engine speed signal and the fuel quantity signal, the data processor operable to store at least one engine operating map including a desired boost pressure map, the desired boost pressure map being a function of engine speed and fuel quantity, the data processor being further operable to generate a desired boost pressure signal based on the desired boost pressure map, the engine speed signal, and the fuel quantity signal;a closed loop control circuit coupled with the data processor to receive the desired boost pressure signal, the closed loop control circuit operable to generate a first desired nozzle vane position based on the desired boost pressure signal;an open loop control circuit coupled with the first and second sensors to receive the engine speed and the fuel quantity signals, the open loop control circuit operable to generate a second desired nozzle vane position based on the engine speed signal and fuel quantity signals; anda switching circuit coupled with the first and second sensors and the closed and open loop control circuits, the switching circuit operable to transmit one of the first and second desired nozzle vane positions as a function of the engine speed and the fuel quantity;wherein the data processing means is further operable to generate a corrected desired boost pressure signal by summing the desired boost pressure signal with a boost pressure correction signal, the boost pressure correction signal being generated from a boost pressure correction map, the engine speed signal, and an atmospheric pressure signal from an atmospheric pressure sensor.