Abstract:
An exhaust gas recirculation system includes: a turbocharger (8) that includes a compressor (8a) and a turbine (8b); a throttle valve (7), provided in an intake passage (3) upstream of the compressor (8a); an EGR passage (11) through which a portion of exhaust gas from the exhaust passage (4) is recirculated to the intake passage (3) between the throttle valve (7) and the compressor (8a); and an EGR valve (13) that regulates a flow rate of exhaust flowing in the EGR passage (11). The exhaust gas recirculation system further includes valve control means that controls the opening degree of the throttle valve (7) and the opening degree of the EGR valve (13) so that the pressure in the intake passage (3) between the throttle valve (7) and the compressor (8a) is maintained at or above a predetermined pressure.
Abstract:
The invention calculates a second order differential of at least one of an airflow rate of a centrifugal compressor (26a) (step S 108) and a pressure and a temperature of air in an inlet of the centrifugal compressor. Then, the invention determines whether the calculated second order differential is equal to or greater than a predetermined value (step S 110). If the number of times (counter value) the second order differential is determined to be equal to or greater than the predetermined value reaches or exceeds a threshold value (step S 116), the invention determines that a surge occurs in the centrifugal compressor (26a) (step S 118).
Abstract:
The invention relates to an exhaust gas purification system applied to an internal combustion engine. The engine has a turbocharger (40) including a turbine wheel (45) and a housing (42H) for housing the turbine wheel. The housing defines a turbine outlet passage (44) communicating with an exhaust gas discharging part (49) of the turbine wheel. The engine further has an exhaust passage part (34) communicating with an exhaust gas outlet (44O) of the turbine outlet passage. The system comprises an exhaust gas purification apparatus disposed in the exhaust passage part at a position adjacent to the exhaust gas outlet of the turbine outlet passage. Further, the apparatus includes an exhaust gas purification member (51). The member is provided such that its density in a peripheral part (34P) of the exhaust passage part is larger than that in a central part (34C) of the exhaust passage part and a flow passage resistance per unit volume of the member at an area of the central part of the exhaust passage part is smaller than that at an area of the peripheral part of the exhaust passage part.
Abstract:
An object of the present invention is to provide an exhaust system component having excellent properties to be located in an exhaust flow path from an internal combustion engine, particularly, an exhaust system component having an extended use-life. The exhaust system component of the present invention for an internal combustion engine has a self-healing ceramic material and an electric heater for heating the self-healing ceramic material. In particular, the exhaust system component of the present invention is an oxygen sensor (110) having a detection element (111) and an electric heater (112), wherein the detection element (111) has a solid electrolyte layer, a reference-side electrode layer, an exhaust-side electrode layer, and a diffusion layer and/or a trap layer each composed of a self-healing ceramic material.
Abstract:
An object of the invention is to provide a technique for excellently controlling a supercharger equipped with an electric motor. A supercharging system for an internal combustion engine according to the present invention is provided with a supercharger equipped with an electric motor, where rotation of the rotary shaft of the supercharger is assisted by the electric motor, and control unit for controlling assisting force of said electric motor in such a way that the rotation speed of the supercharger becomes a target rotation speed. The control unit determines the target rotation speed of the supercharger based on any one of (1) the degree of opening of the accelerator, (2) the degree of opening of the accelerator and the rotation speed of the internal combustion engine, (3) the actual degree of opening of a throttle valve and the rotation speed of the internal combustion engine, and (4) the target degree of opening of the throttle valve and the rotation speed of the internal combustion engine, and controls the assisting force by the electric apparatus in such a way that the target rotation speed is attained.