Ford Global Technolgoies, LLC

Yong Shu

Harold Huimin Sun

Michiel Jacques Van Nieuwstadt

Brien Lloyd Fulton

Frank M Korpics

Dave R Hanna

Tim Schram

Diana D Brehob

Michiel J Vvan Nieuwstadt

A method for operation of an engine including a turbocharger system is provided. The method includes adjusting turbocharger rotational acceleration or deceleration in response to one or more resonant frequencies. Additionally in some examples, the method may further include increasing turbocharger rotation in response to one or more resonant frequencies during a first condition, and increasing turbocharger deceleration in response to one or more resonant frequencies during a second condition, the second condition different from the first condition. In this way, it is possible to enhance the useful life cycle of the turbocharger and associated engine by limiting the operating time in a resonant frequency band.

Control strategy for decreasing resonance in a turbocharger

A method for responding to an existing or incipient surge condition of a turbocharger coupled to an engine of a motor vehicle is provided. The method comprises receiving a signal responsive to an operating condition of the turbocharger and adjusting one or more operating parameters of the motor vehicle when a power of the signal, integrated over a pre-selected range of non-zero frequencies, exceeds a pre-selected threshold. Other embodiments provide related systems for responding to an existing or incipient surge condition of a turbocharger.

Transient compressor surge response for a turbocharged engine

A method for operating a turbocharged engine includes adjusting turbocharger rotational acceleration or deceleration in response to one or more resonant frequencies. Additionally in some examples, the method may further include increasing turbocharger rotation in response to one or more resonant frequencies during a first condition, and increasing turbocharger deceleration in response to one or more resonant frequencies during a second condition, the second condition different from the first condition. In this way, it is possible to enhance the useful life cycle of the turbocharger and associated engine by limiting the operating time in a resonant frequency band.

A method for estimating the output temperature of the output compressor of a two-stage turbocharger. The method includes: storing a composite relationship relating temperature ratio across a pair of compressors of the two-stage turbocharger as a function of mass flow through such pair of compressors and pressure drop across the pair of the compressors; calculating the pressure ratio equal to the pressure at an input to the first one of the pair of compressors to the pressure at the output of the second one of the pair compressor; using the composite relationship and an output of a mass flow at the input to the first one of the pair of compressors and the calculated pressure ratio to determine the temperature ratio across the pair of compressors; and calculating the estimated output temperature of the second one of the pair of compressors by multiplying the determined temperature ratio across the pair of compressors by a temperature at the input of the first one of the pair of compressors.

Method for estimating compressor output temperature for a two-stage turbocharger

A method for controlling engine operation, the engine having a turbocharger coupled between an intake and exhaust manifold of the engine via a turbocharger shaft, the method comprising dynamically determining turbocharger shaft speed based at least on intake and exhaust manifold conditions using a torque balance across the turbocharger; and adjusting turbocharger boosting to adjust turbocharger shaft speed in response to said dynamically determined turbocharger shaft speed.

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Northville, MI, United States of America

Yong Shu