Patent ID: 6234149
Filing Date: 2001-05-22
Classification: F02D,Y02T

Abstract:
An engine control system for optimizing a tradeoff between turbocharger lag and production of exhaust emissions including altitude compensation, comprising:a turbocharger coupled to an internal combustion engine;a fuel system responsive to a fueling signal to supply fuel to said engine;means for determining a boost pressure indicative of air pressure supplied by said turbocharger to said engine and providing a boost pressure signal corresponding thereto;means for determining engine speed and providing an engine speed signal corresponding thereto;means for determining ambient air pressure and producing an ambient air pressure signal corresponding thereto; anda control computer responsive to said boost pressure signal and said engine speed signal to produce a first fueling limit, and to said boost pressure signal and said ambient air pressure signal to produce a second fueling limit, said control computer limiting said fueling signal as a function of said first and second fueling limits to thereby compensate for changes in altitude while optimizing a tradeoff between turbocharger lag and production of exhaust emissions.