Variable area turbocharger turbine and control system therefor

Power plants – Fluid motor means driven by waste heat or by exhaust energy... – With supercharging means for engine

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F02B 3712

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active

047794232

ABSTRACT:
A turbocharger is provided with a system for varying the effective area of the turbine, as a predetermined function of engine rpm. The function comprises a maximum area first portion (I) at high rpms, a second minimum area portion (II) at lower rpms and an intermediate third portion (III). The third portion has a characteristic that the effective turbine area increases as a direct function of engine rpm preestablished to optimize selected operating parameters. A feedback device generates a signal representing the actual effective area and supplies it to a controller. The controller is responsive to the feedback signal to generate pressure pulses applied to a pressure responsive turbine area actuator for varying the effective area of the turbine.

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