Patent ID: 7788922
Filing Date: 2010-09-07
Classification: F02B,F02M,Y02T

Abstract:
1. A method of optimizing boost pressure of an internal combustion engine having a turbo-charger with a compressor and an exhaust driven turbine with a waste-gate flow path that bypasses the turbine in a parallel path, and a waste-gate mass flow rate {dot over (m)} WG through the waste-gate flow path being adiustable by a waste-gate valve, comprising the steps of: providing an engine controller being in electrical communication with the engine; providing a desired boost pressure P calculating a desired waste-gate mass flow rate {dot over (m)} generating the control signal from the controller being received by the waste-gate valve, wherein the engine controller is adapted to operatively control the waste-gate valve using the control signal such that the waste-gate mass flow rate {dot over (m)} wherein said step of calculating the desired waste-gate mass flow rate {dot over (m)} determining a desired compressor mass flow rate {dot over (m)} determining a desired compressor pressure ratio Pr determining a desired compressor power P determining a desired corrected turbine mass flow rate {dot over (m)} determining a desired turbine pressure ratio Pr determining the desired waste-gate mass flow rate at standard sonic conditions {dot over (m)}