摘要:
In cases where an NOx selective reduction catalyst is provided at a location downstream of an NOx storage reduction catalyst, NOx purification performance in an exhaust gas purification apparatus as a whole is maintained, irrespective of deterioration of the NOx storage reduction catalyst. For this purpose, the reduction of NOx in the NOx storage reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is low than when it is high, and the reduction of NOx in the NOx selective reduction catalyst is promoted more when the degree of deterioration of the NOx storage reduction catalyst or the NOx selective reduction catalyst is high than when it is low.
摘要:
A warm-up system for an exhaust gas apparatus includes the exhaust gas apparatus having a turbocharger (6) provided with a turbine (61), a first exhaust gas control catalyst (51) provided downstream of the turbine, a bypass passage (52) bypassing the turbine, and an adjustment unit (53, 54; 56) adjusting a turbine inflow exhaust gas flow rate and an electronic control unit (10). The electronic control unit (10) is configured to perform a warm-up control which warms the turbine by controlling the turbine inflow exhaust gas flow rate, by using the adjustment unit, to reach a flow rate higher than zero and lower than the post-warm-up flow rate when an operating state of the internal combustion engine remains constant, such that a warmed state of the first exhaust gas control catalyst is maintained after the first exhaust gas control catalyst is warmed.
摘要:
A controller for an internal combustion engine (10) is configured, when the speed of combustion of a fuel in a cylinder (14') changes as the property of the fuel injected from a fuel injection valve (26) changes, to change a combustion limit excess air ratio that is a target value of a fuel injection amount feed forward control according to a first relationship that the combustion limit excess air ratio increases as the speed of combustion of the fuel in the cylinder (14') increases. The controller is also configured, when the speed of combustion of the fuel in the cylinder (14') changes as the property of the fuel injected from the fuel injection valve (26) changes, to change the value of a combustion limit combustion speed parameter that is the target value of a fuel injection amount feedback control according to a second relationship that the speed of combustion of the fuel in the cylinder (14') corresponding to a combustion limit increases as the speed of combustion of the fuel in the cylinder (14') increases.
摘要:
The present invention has for its object to provide a technology in which in an exhaust gas purification apparatus for an internal combustion engine which is provided with a catalyst for NH 3 generation, and a catalyst for removing or reducing NOx in an exhaust gas by using NH 3 as a reducing agent, NOx in the exhaust gas can be reduced, even in cases where the NH 3 generation capacity of the catalyst for NH 3 generation has become low. In order to solve this object, the exhaust gas purification apparatus for an internal combustion engine of the invention is provided with a three-way catalyst and a storage reduction catalyst as catalysts for NH 3 generation, wherein when the NH 3 generation capacity of the storage reduction catalyst does not become low, NH 3 is made to be generated in the storage reduction catalyst by adjusting the air fuel ratio of the exhaust gas flowing into the storage reduction catalyst to a first predetermined rich air fuel ratio, whereas when the NH 3 generation capacity of the storage reduction catalyst becomes low, NH 3 is made to be generated in the three-way catalyst by adjusting the air fuel ratio of the exhaust gas flowing into the three-way catalyst to a second rich air fuel ratio which is higher than the rich air fuel ratio and lower than a theoretical air fuel ratio.
摘要:
A control apparatus of an internal combustion engine in which a plurality of cylinders is divided into a first cylinder group (1a) and a second cylinder group (1b), the internal combustion engine being able to be selectively switched between operating in a partial cylinder operation mode in which only one of the first cylinder group (1a) and the second cylinder group (1b) is operated, and operating in a full cylinder operation mode in which both the first cylinder group (1a) and the second cylinder group (1b) are operated. This control apparatus includes a supercharger (8), as well as a controller (30) that selectively starts and stops operation of the supercharger (8) depending on a load on the internal combustion engine when the internal combustion engine is to be operated in the partial cylinder operation mode.
摘要:
An internal combustion engine includes an intake air temperature adjustment apparatus that adjusts the temperature of intake air, and a control apparatus that operates at least the intake air temperature adjustment apparatus. When the internal combustion engine operates in a stoichiometric EGR mode, the control apparatus operates the intake air temperature adjustment apparatus so that the temperature of intake air entering a combustion chamber enters a first temperature region. When the internal combustion engine operates in a lean mode, the control apparatus operates the intake air temperature adjustment apparatus so that the temperature of intake air entering a combustion chamber enters a second temperature region that is a lower temperature region than the first temperature region.