Patent ID: 8302402

Claim:
An air induction system for a power system, comprising: a compressor operable to compress air directed into an engine; a throttle valve disposed between the compressor and the engine, the throttle valve being configured to selectively restrict the flow of compressed air into the engine; a recirculation loop disposed between the compressor and the throttle valve, the recirculation loop including a recirculation valve configured to selectively divert a portion of the flow of compressed air away from the engine through the recirculation loop; and a controller configured to actuate the recirculation valve in response to a pressure differential between air upstream of the throttle valve and air downstream of the throttle valve to maintain a reserve of air upstream of the throttle valve at a higher pressure than a pressure of air downstream of the throttle valve, and the controller further configured to open the recirculation valve to increase an amount of air flowing through the recirculation loop when the pressure differential is above a first threshold value and to close the recirculation valve to decrease the amount of air flowing through the recirculation loop when the pressure differential is below a second threshold value different than the first threshold value, such that the reserve of air is maintained at a pressure between the first and second threshold values for rapidly responding to transient loads on the engine.