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The reduction of particulate emissions of turbodiesel powered vehicles has limited the amount of fuel that can be injected at low engine speeds. Supercharging under these conditions provides increased air flow, increased BMEP and reduction of smoke. A Sequential Hydro-Supercharging System (SHS) has been developed to provide increased air flow to the engine in a controllable fashion over the engine's entire speed and load ranges. The SHS utilizes two standard turbocharger compressor impellers driven by well proven, miniature, high speed, high efficiency hydraulic turbines. Each of these turbines is capable of producing 10 HP at 70,000 rpm. A complete SHS package suitable for a 230 hp turbodiesel is comprised of two TO4B size hydro-superchargers, two sequential gear pumps, solenoid valves, oil cooler and a 2 liter oil tank. The entire SHS weighs less than 16 kilograms.

New stringent diesel emission regulations have had the effect of limiting the acceleration rates of turbodiesel powered vehicles. A need for supercharging of turbodiesels has been well explained in the Ref. 1 SAE Paper by Mr. Thomas N. Schmitz et al workers of Mercedes Benz AG. The proposed engine air supply system submitted in this paper, utilizes two standard type radial flow compressors staged in series. The first compressor is a supercharger driven by a miniature, very high speed, high efficiency hydraulic turbine. Kapich Engineering has developed, and extensively tested, this high efficiency hydraulic turbine supercharger that incorporates a unique hydraulic system to power and control the supercharger. The second compressor is a standard turbocharger driven by the engine exhaust. The primary objective of the proposed system is to provide a dramatic increase of BMEP in the low engine speed range.