Patent ID: 6357234
Filing Date: 2002-03-19
Classification: F01N,F02B,Y02T

Abstract:
A turbocharger system for an internal combustion engine, comprising:a plurality of turbochargers, each said turbocharger including: a rotatable shaft, a turbine having a turbine wheel carried by said shaft, an inlet and a variable nozzle at said inlet; and a multi-stage compressor including a first compressor wheel carried by said shaft, a first inlet associated with said first compressor wheel, a radially extending first outlet associated with said first compressor wheel, a second compressor wheel carried by said shaft, a second inlet associated with said second compressor wheel, a radially extending second outlet associated with said second compressor wheel, and an interstate duct fluidly interconnecting in series said first outlet associated with said first compressor wheel with said second inlet associated with said second compressor wheel; at least one sensor, each said sensor configured to sense an operating parameter associated with said turbocharger system and provide an output signal, said at least one sensor including a plurality of speed sensors, each said speed sensor configured to sense a rotational speed of a corresponding said shaft; and a controller coupled with each said sensor and each said variable nozzle, said controller independently controlling operation of each said variable nozzle dependent upon at least one said output signal, said controller controlling operation of each said variable nozzle such that each said shaft has a rotational speed which is substantially equal.