Compressor override control

An engine controller configured to control air flow between a compressor and an intake manifold based on an accelerator actuator position, the engine controller comprising:

• an input port for receiving:
• a compressor air flow signal that represents a measure of air flow through the compressor;
• a compressor inlet pressure signal that represents a measure of pressure at an inlet of the compressor;
• a compressor outlet pressure signal that represents a measure of pressure at an outlet of the compressor;
• and
• an accelerator actuator signal that represents a measure of a position of an accelerator actuator;
• an output port;
• a processor operatively coupled to the input port and the output port;
• memory having instructions stored therein that are executable by the processor to:
• determine a value based on the accelerator actuator signal and one or more of the compressor air flow signal, the compressor inlet pressure signal, and the compressor outlet pressure signal;
• compare the determined value to a threshold;
• and
• provide one or more control signals via the output port to control an air flow between a compressor and an intake manifold based on a first equation when the determined value is on a first side of the threshold and based on a second equation when the determined value is on a second side of the threshold.

A method for controlling air flow in an engine system between a compressor and an intake manifold based on an accelerator actuator position, the method comprising:

• receiving an accelerator actuator control signal;
• receiving a sensor signal including a measure of a parameter related to operation of an engine;
• determining a value based on the received accelerator actuator control signal and the received sensor signal;
• comparing the value to a threshold;
• adjusting a position of an actuator of an engine system based on the accelerator actuator control signal according to a first equation when the value is on a first side of the threshold and according to a second equation when the value is on a second side of the threshold;
• and
• wherein the threshold is a surge line on a compressor map of flow rate of air flow from the compressor to the intake manifold versus a pressure ratio of a pressure at an output of the compressor over a pressure at an input of the compressor.