摘要:
In forced regeneration control of an exhaust gas purification device 12, the number of data for injection control such as the number of meshes of a data map and the number of data maps for multi injection control is decreased while occurrence of torque shock, which is a rapid fluctuation of a generated torque, is avoided. In the forced regeneration control of the exhaust gas purification device 12, when an operation state of an internal combustion engine 10 is a high-load operation state, the normal injection control by stopping the multi injection is carried out and according to a rotation speed Ne and a load Q of the internal combustion engine 10, a region for control is divided into a multi-injection control region Rm, a transition region Rt, and a normal injection control region Rn, and in the transition region Rt, data Ft(i) for injection control obtained by interpolation of data Fml(i) for injection control on the multi-injection control region Rm side and data Fnl(i) for injection control on the normal injection control region Rn side is used.
摘要:
It is an object of the present invention to provide an engine device in which a support structure of an exhaust throttle device can be made as a high rigidity structure, and it is possible to prevent the exhaust throttle device from being heated by radiation heat from peripheries of the exhaust throttle device. The engine device of the invention includes an engine (1) having an exhaust manifold (7), and the exhaust throttle device (65) adjusts exhaust gas pressure of the exhaust manifold (7). An exhaust gas intake side of a throttle valve case (68) of the exhaust throttle device (65) is fastened to an exhaust gas outlet of the exhaust manifold (7), and an exhaust gas pipe (72) is connected to the exhaust manifold (7) through the throttle valve case (68). An intermediate portion of a cooling pipe of an EGR cooler (29) is provided with a cooling water pipe of the exhaust throttle device (65).
摘要:
In regeneration control, when the catalyst temperature index temperature (Tg2) using the temperature of the oxidation catalyst (12a) as an index is below a predetermined first determination temperature (Tc1), the engine speed of idling is brought to a predetermined first target engine speed (Neil) which is higher than the engine speed of idling (Nei0) in the ordinary operation, and, further, multi-injection is carried out. On the other hand, when the catalyst temperature index temperature (Tg2) is the predetermined first determination temperature (Tc1) or above, the engine speed of idling is brought to a predetermined second target engine speed (Nei2), which is lower than the predetermined first target engine speed (Nei1) and is higher than the engine speed of idling (Nei0) in ordinary operation, and, further, post injection is carried out, followed by raising of the temperature of an exhaust gas flown into a DPF apparatus (12b) to a predetermined second determination temperature (Tc2). According to the above constitution, in the regeneration control of the DPF apparatus (12b) in an internal combustion engine (10), the regeneration can be forcibly carried out with high efficiency while enhancing the temperature rise efficiency of the exhaust gas, and, at the same time, excessive rise in the exhaust temperature, a deterioration in fuel consumption, and the occurrence of noise are suppressed.
摘要:
Provided is an exhaust gas purification system in which exhaust pipe injection by PID control can be accurately controlled in traveling automatic regeneration even with repeated acceleration and deceleration or even when an exhaust brake valve is closed. A DPD 25 is connected to an exhaust pipe 20 of a diesel engine 10, an exhaust gas temperature during automatic regeneration of the DPD 25 is detected, and the difference between the detected exhaust gas temperature and a target regeneration temperature is determined. In a case where an exhaust pipe injection amount is PID controlled based on this difference, when an exhaust brake valve 24 is closed during traveling automatic regeneration, the exhaust pipe injection is stopped and calculation of an integral control term by the PID control is continued as long as the exhaust valve brake valve 24 is closed, and when the exhaust brake valve 24 is opened, the integral control term that has been continuously calculated is taken as an initial operation amount.
摘要:
An object is to provide an engine apparatus that ensures highly accurate adjustment of the exhaust gas pressure of an exhaust manifold 7 while providing an exhaust gas throttle device 65 with a support structure of increased rigidity. The engine apparatus includes: an engine 1 including the exhaust manifold 7; and the exhaust gas throttle device 65 to adjust an exhaust gas pressure of the exhaust manifold 7. An exhaust gas intake side of a throttle valve casing 68 of the exhaust gas throttle device 65 is fastened to an exhaust gas exit of the exhaust manifold 7. An exhaust pipe 72 is coupled to the exhaust manifold 7 through the throttle valve casing 68.
摘要:
Certain embodiments include a method for controlling an internal-combustion engine (10). The engine (10) is provided with a turbo supercharger having a variable nozzle (63). The method may comprise one or more of steps. The first step is forcing the nozzle (63) to a closing side by a controller (50), so that an exhaust gas temperature of the engine (10) is raised. The second step is decreasing a closing speed of the nozzle (63) by the controller (50), when an opening degree of the nozzle (63) is less than or equal to a predetermined opening degree. In the second step, the closing speed becomes lower than a closing speed of the nozzle (63) during a period until the opening degree reaches the predetermined opening degree. The third step is moving the nozzle (63) to a closing side until a mechanical limit position by the controller (50).
摘要:
A DPF system that suppresses clogging of a DPF and enhances convenience is provided. The DPF system includes: accumulated PM quantity estimation means 6 for estimating an accumulated PM quantity in an idle state; and a long low idle forced regeneration unit 5 that if the accumulated PM quantity estimated by the accumulated PM quantity estimation means 6 exceeds a predetermined quantity, performs long low idle forced regeneration that automatically performs regeneration of a diesel particulate filter 12b, and the long low idle forced regeneration unit 5 is configured to, when a vehicle starts moving during long low idle forced regeneration, perform automatic regeneration that automatically performs regeneration of the diesel particulate filter 12b while the vehicle is moving.