Patent ID: 7748366

Claim:
A drive system, comprising: an engine configured to convert chemical energy into mechanical energy; an electronically-controlled air throttle configured to regulate air delivery to the engine; an electronically-controlled supercharger configured to increase pressure of the air delivered to the engine; and a controller configured to variably engage the supercharger based on an operating parameter of the drive system, the variable engagement including 100% engagement, 0% engagement, and at least one level of engagement intermediate 100% engagement and 0% engagement, the variable engagement scheduled based at least in part on an operating parameter, the controller further configured to adjust the electronically-controlled air throttle to maintain substantial continuity in torque as engagement of the supercharger changes, the adjusting including a temporary increase in throttle restriction of airflow while the supercharger transitions from disengaged to engaged and while it spools up, and a temporary decrease in the throttle restriction of airflow while the supercharger transitions from engaged to disengaged and while it spools down, the throttle adjustment further based on detected supercharger engagement degradation including over-boosting or under-boosting, the controller configured to adjust the electronically-controlled air throttle based at least in part on supercharger engagement.