A turbine-compressor assembly includes a turbine-compressor device fluidly coupled with a heat source, a compressor, and a turbine via plural valves. A power device is coupled with the turbine-compressor device via a shaft. A controller can control operation of the plural valves to control the movement of fluids within the assembly to selectively switch between the turbine-compressor device operating in one of plural operating modes. In a first mode of operation, the turbine-compressor device can generate electrical power and direct the electrical power to the power device to control an amount of power provided to or extracted from the shaft by the power device. In a second mode of operation, the turbine-compressor device can receive electrical power from the power device to consumer the electrical power.

A turbine-compressor assembly includes a turbine-compressor device fluidly coupled with a heat source, a compressor, and a turbine via plural valves. A power device is coupled with the turbine-compressor device via a shaft. A controller can control operation of the plural valves to control the movement of fluids within the assembly to selectively switch between the turbine-compressor device operating in one of plural operating modes. In a first mode of operation, the turbine-compressor device can generate electrical power and direct the electrical power to the power device to control an amount of power provided to or extracted from the shaft by the power device. In a second mode of operation, the turbine-compressor device can receive electrical power from the power device to consumer the electrical power.

Methods and systems are provided for a turbocharger. In one example, a method includes adjusting one or more of a wastegate position and a position of vanes with operation of a turbocharger to reach a desired turbocharger speed via a controller. The method further includes adjusting engine operating parameters to reach the desired turbocharger speed.

An object is to provide a supercharging system capable of actively and easily controlling a rotational speed of a turbine generator. A supercharging system includes a compressor driven by an electric motor to pump fluid to an engine, a turbine generator rotated by exhaust from the engine, and a drive device that drives the electric motor by electricity generated by the turbine generator, wherein the drive device includes a rectifying unit that rectifies the electricity generated by the turbine generator, a converter unit that steps up or down a voltage value of a DC voltage rectified by the rectifying unit and outputs the DC voltage, an inverter unit that drives the electric motor using the DC voltage output from the converter unit, and a control unit that controls a change amount of the DC voltage in the converter unit.

An object is to provide a supercharging system capable of actively and easily controlling a rotational speed of a turbine generator. A supercharging system includes a compressor driven by an electric motor to pump fluid to an engine, a turbine generator rotated by exhaust from the engine, and a drive device that drives the electric motor by electricity generated by the turbine generator, wherein the drive device includes a rectifying unit that rectifies the electricity generated by the turbine generator, a converter unit that steps up or down a voltage value of a DC voltage rectified by the rectifying unit and outputs the DC voltage, an inverter unit that drives the electric motor using the DC voltage output from the converter unit, and a control unit that controls a change amount of the DC voltage in the converter unit.

A method for operating an internal combustion engine with a system for supercharging that includes an exhaust turbocharger and an electrically driven charging device for dynamic assistance during build-up of boost pressure, with: determining a drive criterion of the charging device, establishing an initial quantity of the drive criterion; continuously determining a reduction factor for the drive criterion within a balance period; applying the reduction factor to the initial quantity of the drive criterion; and operating the charging device with the drive criterion reduced by the reduction factor.

A method for operating an internal combustion engine with a system for supercharging that includes an exhaust turbocharger and an electrically driven charging device for dynamic assistance during build-up of boost pressure, with: determining a drive criterion of the charging device, establishing an initial quantity of the drive criterion; continuously determining a reduction factor for the drive criterion within a balance period; applying the reduction factor to the initial quantity of the drive criterion; and operating the charging device with the drive criterion reduced by the reduction factor.

An engine system has an internal combustion engine, a turbocharger provided with a compressor and with a turbine; and a supply line, which supplied air to the engine through said compressor; the supply line has a supplementary compression stage, which is distinct from the compressor and is controlled in combination with and adjustment of the turbine, in order to limit the back pressure of the exhaust gases flowing out of the engine; in particular, said compression stage is defined by an ejector.

New and/or alternative approaches to physical plant performance control that can account for the health of the physical plant. In one example, a control algorithm is enhanced by inclusion of terms related to optimized performance and terms related to physical plant health. In another example, a performance optimized control solution is determined, a maximum allowed deviation is defined, and a final solution for physical plant control is determined taking into account health factors to minimize health impacts within the maximum allowed deviation from optimized performance, using for example a two-stage analysis. Another example uses a two level system with a low level controller and a supervisory controller, in which the supervisory controller observes health impacts of ongoing operations managed by the low level controller, and modifies one or more parameters used by the low level controller.

New and/or alternative approaches to physical plant performance control that can account for the health of the physical plant. In one example, a control algorithm is enhanced by inclusion of terms related to optimized performance and terms related to physical plant health. In another example, a performance optimized control solution is determined, a maximum allowed deviation is defined, and a final solution for physical plant control is determined taking into account health factors to minimize health impacts within the maximum allowed deviation from optimized performance, using for example a two-stage analysis. Another example uses a two level system with a low level controller and a supervisory controller, in which the supervisory controller observes health impacts of ongoing operations managed by the low level controller, and modifies one or more parameters used by the low level controller.