Patent ID: 8109255

Claim:
An engine controller for controlling at least part of an engine of a vehicle, the engine controller comprising: one or more inputs for receiving one or more input signals from one or more emission sensors that are configured to detect NOx and PM emissions of an engine, wherein the NOx emissions and the PM emissions are dependent on each other and generally fall along a NOx-PM operating curve during operation of the engine; two or more outputs for providing control signals to two or more actuators that control two or more inputs to the engine; a controller coupled to the one or more inputs and the two or more outputs, the controller implementing a multi-parameter control algorithm that is configured to use the one or more input signals, and adjust two or more actuators of the engine via the two or more outputs to control the NOx emissions and the PM emissions of the engine such that both the NOx emissions and the PM emissions of the engine remain within corresponding NOx and PM emission limits; and the multi-parameter control algorithm is configured to rely on the one or more inputs that correspond to the NOx emissions along a first part of the NOx-PM operating curve, rely on the one or more inputs that correspond to the PM emissions along a second part of the NOx-PM operating curve, and rely on the one or more inputs that correspond to the NOx and PM emissions along a third part of the NOx-PM operating curve.