Abstract: A control system for an internal combustion engine and an associated pressure wave supercharger, which optimizes exhaust emissions and engine performance by automatically switching the mode of control between a cold start and white smoke mode, an altitude dependent mode, a low emissions mode, a fuel economy mode, and a particulate trap regeneration mode as the operating conditions of the engine change.

Abstract: A hydraulic drive system for a pressure wave supercharger having a circular array of elongated chambers disposed to form a rotor rotatably disposed in a housing, the pressure wave supercharger being cooperatively associated with an internal combustion engine, and the hydraulic drive system comprising at least one hydraulic pump, a hydraulic motor driven by hydraulic fluid supplied by the hydraulic pump and coupled to the rotor and a control valve for regulating the speed of the hydraulic motor and the rotor to synchronize the pressure wave action within the elongated chambers of the rotor and supply combustion air to the engine at the proper volume and density at various operating conditions.