Patent ID: 7055504

Claim:
A fuel injection control system for a diesel engine for powering a railroad locomotive, said fuel injection control system comprising: a barometric pressure timing controller adapted to control fuel injection timing based on changes in barometric pressure; a memory in communication with said barometric pressure timing controller for storing a nominal value of a parameter of the engine intake air corresponding to an engine performance characteristic, where said nominal value of said engine intake air parameter is measured at a nominal barometric pressure; a sensor in communication with said barometric pressure timing controller for sensing an instantaneous value of said engine intake air parameter; and at least one engine performance sensor in communication with said barometric pressure timing controller for sensing an instantaneous value for said engine performance characteristic; wherein said barometric pressure timing controller communicates with said memory to access a nominal value of said engine intake air parameter corresponding to said instantaneous value of said engine performance characteristic; and wherein said barometric pressure timing controller determines an instantaneous value of barometric pressure based on said nominal value of barometric pressure and the difference between said nominal value of said engine intake air parameter and said instantaneous value of said engine intake air parameter, to provide a signal indicative of changed barometric pressure to control fuel injection timing.