Some embodiments of the teachings herein include an apparatus for diagnosing bypass valve failure in an electric supercharger with a motor and an electric compressor comprising: a bypass valve on a bypass line branching from an intake line with the electric supercharger; and a control unit which assesses the vehicle-state information to determine whether failure criteria of a bypass valve start are satisfied. If the failure criteria are satisfied, the control unit transmits ‘open’ or ‘close’ control instructions to the bypass valve and transmits, to the electric supercharger, a specific rotational-speed target value for determining whether the bypass valve is in the normal open state or the normal closed state, thereby determining whether the bypass valve is subject to stuck-open failure or stuck-closed failure.

New and/or alternative approaches to physical plant performance control that can account for the health of the physical plant. A physical plant may be controlled by configurable controller, which may further comprise a low level controller associated with a higher level controller such as an Engine Control Unit (ECU). The ECU uses modeling to calculate an estimated operating value of a first parameter in the physical plant, and also uses a sensor to measure an operating value of the first parameter. The measured and modeled values are compared to determine the state of health (SOH) of the physical plant or a component thereof. The SOH may be stored, transmitted, or used to modify one or more control values used by the low level controller.

The invention relates to a method of controlling engine derating of an internal combustion engine (10) being provided with a turbocharger (110) and a variable inlet guide vanes assembly (130) arranged upstream a compressor (120) of the turbocharger (110). The method comprises determining a current operational condition requiring engine derating, detecting a current operational condition of the compressor (120), and controlling the position of the variable inlet guide vanes assembly (130) based on the detected operational condition of the compressor (120).

An internal combustion engine including a block, a head coupled to the block to at least partially define a cylinder therebetween, and a compressor assembly having an inlet and an outlet in fluid communication with the cylinder. Where the compressor is operable in a first mode, in which a first portion of the gasses exiting the outlet are directed to the cylinder and a second portion of the gasses exiting the outlet is recirculated back to the inlet.

The speed of a turbocharger may be estimated using data from sensors that are readily available in most engine management systems. In some cases, a pressure measurement from a MAP sensor may be used, in combination with one or more computational models, to provide an efficient, lower cost estimate of turbo speed that can be used to control operation of the engine and/or the turbocharger.

A turbocharger system includes a valve member with at least one valve passage. The valve member is supported for rotation about an axis of rotation between a first position, a second position, and a third position. The axis of rotation is oriented transverse to flow within a first volute passage and a second volute passage. The valve passage, with the valve member in the first position, provides a cross flow path between the first volute passage and the second volute passage and provides a bypass flow path from at least one of the first and second volute passages and a bypass passage. In the second position, the valve passage provides the cross flow path, and the valve member substantially prevents flow along the bypass flow path. The valve member, in the third position, substantially prevents flow along the cross flow path and the bypass flow path.

A dual volute turbocharger for use with an internal combustion engine includes a valve for controlling exhaust gas flow to a turbine housing interior of the dual volute turbocharger. The dual volute turbocharger also includes a first volute and a second volute each adapted for fluid communication with the internal combustion engine. The dual volute turbocharger further includes a wall separating the first and second volutes and a valve seat. The valve seat and the wall collectively define a valve cavity. The valve is movable between a closed position and an open position. The valve and the wall of the turbine housing collectively define a first cross-sectional flow area. The valve and the valve seat collectively define a second cross-sectional flow area. A method of controlling the valve of the dual volute turbocharger is also disclosed.

Proposed is a gas heat-pump system capable of supplying recirculation exhaust gas using a motor-driven turbocharger and thus actively controlling an amount of flowing recirculation exhaust gas and pressure thereof.

An engine device is equipped with an engine, a supercharger having a turbine, a compressor and a waste gate valve, and a control device that controls the engine and the supercharger, and that performs an abnormality diagnosis of a relationship between an intake air amount of the engine and a supercharging pressure as a pressure downstream of the compressor in the intake pipe. The control device performs boost control for controlling the waste gate valve such that the supercharging pressure becomes higher when a predetermined condition is fulfilled than when the predetermined condition is not fulfilled. The control device further sets a threshold for use in the abnormality diagnosis, based on whether or not the boost control is performed.

A system includes a dual volute turbocharger and a controller. The dual volute turbocharger includes a turbine housing. The turbine housing includes a wall, a valve seat, and an interior surface defining a turbine housing interior, a first volute, a second volute, and a turbine housing outlet. The dual volute turbocharger also includes at least one valve member engageable with at least one of the valve seat and the wall of the turbine housing. The at least one valve member and the wall of the turbine housing collectively define a first cross-sectional flow area. The at least one valve member and the valve seat of the turbine housing collectively define a second cross-sectional flow area. The controller is adapted to control the at least one valve member to have an area ratio constant operating range according to a brake-specific fuel consumption of the internal combustion engine.