A turbocharger system comprises a first relatively small high-pressure (HP) turbocharger (1) and a second relatively large low pressure (LP) turbocharger (2). The turbine (6) of the LP turbocharger (2) is connected in series downstream of the turbine (4) of the HP turbocharger (1) in a first exhaust gas passage (11). An exhaust bypass flow passage (12) provides a bypass flow path around the HP turbine (4). A rotary valve (8) is located at a junction of the bypass flow passage (12) and a first exhaust gas flow passage (11). The rotary valve (8) comprises a valve rotor (19) which is rotatable to selectively permit or block flow to the LP turbine (6) from either the first exhaust gas passage (11) or the bypass gas passage (12).

A throttle valve assembly includes a valve housing having a main channel and an auxiliary channel. A main throttle valve is pivotally mounted in the main channel, and an auxiliary throttle valve pivotally is mounted in the auxiliary channel. A common rotating actuator controls the opening angle of both the main throttle valve and the auxiliary throttle valve through an actuating mechanism. The actuating mechanism includes a crank mechanism connected between an auxiliary pivoting shaft and a gear train driven by the rotating actuator.

A throttle valve assembly includes a valve housing having a main channel and an auxiliary channel. A main throttle valve is pivotally mounted in the main channel, and an auxiliary throttle valve pivotally is mounted in the auxiliary channel. A common rotating actuator controls the opening angle of both the main throttle valve and the auxiliary throttle valve through an actuating mechanism. The actuating mechanism includes a crank mechanism connected between an auxiliary pivoting shaft and a gear train driven by the rotating actuator.

A control apparatus 57 is a 2-input, 2-output integral-type optimal servo system in which intake air amount and intake oxygen concentration are used as control quantities (y1, y2) and the degree of opening of a control valve of an exhaust gas recirculation apparatus and the degree of opening of a control valve of a supercharger equipped with a variable flow rate mechanism are used as manipulated quantities (u1, u2), and includes an output feedback system. The control apparatus (57) is provided with an EGR valve opening degree unit (70) and an opening rate valve of the supercharger. Each of the control units includes a non-interference controller (64) for eliminating interference between the manipulated quantity for the control valve of the exhaust gas recirculation apparatus and the manipulated quantity for the control valve of the supercharger equipped with the variable flow rate mechanism.

A control apparatus 57 is a 2-input, 2-output integral-type optimal servo system in which intake air amount and intake oxygen concentration are used as control quantities (y1, y2) and the degree of opening of a control valve of an exhaust gas recirculation apparatus and the degree of opening of a control valve of a supercharger equipped with a variable flow rate mechanism are used as manipulated quantities (u1, u2), and includes an output feedback system. The control apparatus (57) is provided with an EGR valve opening degree unit (70) and an opening rate valve of the supercharger. Each of the control units includes a non-interference controller (64) for eliminating interference between the manipulated quantity for the control valve of the exhaust gas recirculation apparatus and the manipulated quantity for the control valve of the supercharger equipped with the variable flow rate mechanism.

The invention relates to an assembly (1) comprising: an admission circuit (4) extending between an air inlet (11) and an outlet connected to the inlet of a heat engine (2); an exhaust circuit (6) extending between an inlet connected to the outlet of the heat engine (2) and an exhaust gas outlet (13); said heat engine (2); a return loop (22) enabling all or some of the exhaust gases in the exhaust circuit (6) to be reinjected upstream of the heat engine (2); and an electric compressor (30) arranged in the assembly (1) in such a way as to be able to receive gases recirculating in the return loop (22).

The invention relates to an assembly (1) comprising: an admission circuit (4) extending between an air inlet (11) and an outlet connected to the inlet of a heat engine (2); an exhaust circuit (6) extending between an inlet connected to the outlet of the heat engine (2) and an exhaust gas outlet (13); said heat engine (2); a return loop (22) enabling all or some of the exhaust gases in the exhaust circuit (6) to be reinjected upstream of the heat engine (2); and an electric compressor (30) arranged in the assembly (1) in such a way as to be able to receive gases recirculating in the return loop (22).

An internal combustion engine of the present invention is an internal combustion engine including a supercharger and an EGR device. Further, the internal combustion engine has an ISC passage that connects an upstream side and a downstream side of a throttle valve in an intake passage, and an ISC valve that regulates an amount of air that flows in the ISC passage. A control device of the present invention performs valve opening control that makes an opening degree of the ISC valve an opening degree larger than a reference opening degree when request torque required by the internal combustion engine is smaller than estimated torque that can be generated in the internal combustion engine, and prohibits opening of an EGR valve of the EGR device during execution of the valve opening control.

Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust throttle and an EGR valve to expedite catalyst heating. By closing both valves during an engine cold start, an elevated exhaust backpressure and increased heat rejection at an EGR cooler can be synergistically used to warm each of an engine and an exhaust catalyst. The valves may also be controlled to vary an amount of exhaust flowing through an exhaust venturi so as to meet engine vacuum needs while providing a desired amount of engine EGR.

Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust throttle and an EGR valve to expedite catalyst heating. By closing both valves during an engine cold start, an elevated exhaust backpressure and increased heat rejection at an EGR cooler can be synergistically used to warm each of an engine and an exhaust catalyst. The valves may also be controlled to vary an amount of exhaust flowing through an exhaust venturi so as to meet engine vacuum needs while providing a desired amount of engine EGR.