Abstract: An amount of electric power consumption by a battery is reduced, and deterioration of a coil is suppressed by efficiently heating an injector and melting urea crystals at an early stage. A control device for a reducing agent injection device fills the device with a reducing agent at a start-up of an internal combustion engine and executes control for injecting the reducing agent into an exhaust passage of the internal combustion engine by the injector. The control device includes an energization control section that executes energization control in which, after an exhaust temperature of the internal combustion engine becomes equal to or higher than a specified threshold value, a temperature of the injector is increased by energizing the coil of the injector for a specified time and melting of the crystals of the reducing agent precipitated in the injector is promoted.

Abstract: An exhaust gas purification system capable of preventing clogging of a reducing agent injection valve due to solidified urea aqueous solution to prevent a decrease in the exhaust gas purification efficiency of an internal-combustion engine. The exhaust gas purification system includes a diesel particulate filter, a reducing agent injection valve and an SCR catalyst in this order from the exhaust upstream side. A condition satisfaction determination section determines whether or not urea aqueous solution is likely to be solidified when detecting that an ignition switch is turned off, and an internal-combustion engine stop prevention section prevents the internal-combustion engine from being stopped, based on a determination by the condition satisfaction determination section.

Abstract: An amount of electric power consumption by a battery is reduced, and deterioration of a coil is suppressed by efficiently heating an injector and melting urea crystals at an early stage. A control device for a reducing agent injection device fills the device with a reducing agent at a start-up of an internal combustion engine and executes control for injecting the reducing agent into an exhaust passage of the internal combustion engine by the injector. The control device includes an energization control section that executes energization control in which, after an exhaust temperature of the internal combustion engine becomes equal to or higher than a specified threshold value, a temperature of the injector is increased by energizing the coil of the injector for a specified time and melting of the crystals of the reducing agent precipitated in the injector is promoted.

Abstract: Provided is an exhaust purification system capable of clearing a blockage of a reducing agent injection valve caused by solidification of an aqueous urea solution soon after starting an engine and preventing degradation in exhaust purification efficiency when starting an internal combustion engine.

Abstract: An exhaust gas purification system capable of preventing clogging of a reducing agent injection valve due to solidified urea aqueous solution to prevent a decrease in the exhaust gas purification efficiency of an internal-combustion engine. The exhaust gas purification system includes a diesel particulate filter, a reducing agent injection valve and an SCR catalyst in this order from the exhaust upstream side. A condition satisfaction determination section determines whether or not urea aqueous solution is likely to be solidified when detecting that an ignition switch is turned off, and an internal-combustion engine stop prevention section prevents the internal-combustion engine from being stopped, based on a determination by the condition satisfaction determination section.

Abstract: An exhaust gas purification system capable of preventing clogging of a reducing agent injection valve due to solidified urea aqueous solution to prevent a decrease in the exhaust gas purification efficiency of an internal-combustion engine. The exhaust gas purification system includes a diesel particulate filter, a reducing agent injection valve and an SCR catalyst in this order from the exhaust upstream side. A condition satisfaction determination section determines whether or not urea aqueous solution is likely to be solidified when detecting that an ignition switch is turned off, and an internal-combustion engine stop prevention section prevents the internal-combustion engine from being stopped, based on a determination by the condition satisfaction determination section.

Abstract: [Problem] To provide an exhaust gas purification system capable of preventing clogging of a reducing agent injection valve due to solidified urea aqueous solution to prevent decrease in the exhaust gas purification efficiency of an internal-combustion engine. [Means for Resolution] An exhaust gas purification system including a DPF, a reducing agent injection valve and an SCR catalyst in this order from the exhaust upstream side includes: a condition satisfaction determination section for determining whether or not urea aqueous solution is likely to be solidified when detecting that an ignition switch is turned off; and an internal-combustion engine stop prevention section for preventing the internal-combustion engine from being stopped, based on a determination by the condition satisfaction determination section.

Abstract: Provided is an exhaust purification system capable of clearing a blockage of a reducing agent injection valve caused by solidification of an aqueous urea solution soon after starting an engine and preventing degradation in exhaust purification efficiency when starting an internal combustion engine.

Abstract: A control device and method for exhaust gas purification that can prevent the adsorption amount from becoming excessively lower than the saturated adsorption amount and can prevent the reduction efficiency of the reduction catalyst from degrading, including a device which can predict a transition of the temperature of the reduction catalyst and determine whether that temperature is decreasing; an apparatus which can control injection of the reducing agent according to a first amount that is smaller than a saturated amount corresponding to the temperature of the catalyst if it is determined that the temperature does not decrease continuously for a time; and a second apparatus which can control the injection of the reducing agent according to a second amount that is larger than the first amount and smaller than the saturated amount if it is determined that the temperature of the reduction catalyst continuously decreases for a time.

Abstract: An exhaust gas purification device is capable of diffusing and introducing a reducing agent into a NOx catalyst arranged in a downstream side exhaust gas passage. A housing of the device includes a main body in which an upstream side exhaust gas passage and the downstream side exhaust gas passage are housed, and a cap attached to a first surface of the main body provided with an outlet side opening of the upstream side exhaust gas passage and an inlet side opening of the downstream side exhaust gas passage. At least one of the first surface of the main body and a second surface in the cap which faces the first surface includes a guide portion, for guiding an exhaust gas flow, and a reducing agent diffusion portion, for facilitating mixing of the reducing agent with the exhaust gas.

Abstract: The invention provides an exhaust gas purification apparatus for an internal combustion engine which evenly diffuses a reducing agent over an entirety of the exhaust gas which flows into an NOx catalyst disposed on the downstream side of thereof. The exhaust gas purification apparatus includes an NOx catalyst disposed in an exhaust gas passage of an internal combustion engine, and a reducing agent injecting unit for injecting the reducing agent into the exhaust gas passage which is on an upstream side of the NOx catalyst. A narrowed portion, in which a cross-sectional area of a flow passage is smaller than a cross-sectional area of the exhaust gas passage and of the NOx catalyst, is provided on a downstream side of an injecting position by the reducing agent injecting unit and the upstream side of the NOx catalyst, and a reducing agent diffusing device is provided on the narrowed portion.

Abstract: An exhaust gas purification device for an internal combustion engine that has a turn-back portion in an exhaust gas passageway which makes the device compact and causes a reducing agent to be evenly dispersed and flow into a reduction catalyst disposed in an exhaust gas passageway downstream of the turn-back portion. The device has a lid portion that is attached to a side surface of the body portion and the body portion has an outlet opening for the upstream-side exhaust gas passageway and an inlet opening for the downstream-side exhaust gas passageway, and the turn-back portion comprises a space enclosed by the body portion and the lid portion, and a guide portion for directing the flow direction of exhaust gas with which the reducing agent has become mixed toward the is downstream-side exhaust gas passageway is integrally molded in an opposing surface of the lid portion that opposes the inlet opening of the downstream-side exhaust gas passageway.

Abstract: There are provided a control device and a control method for an exhaust gas purification apparatus that can prevent the actual adsorption amount from becoming excessively lower than the saturated adsorption amount and can prevent the reduction efficiency of the reduction catalyst from degrading even when the temperature of catalyst continues to shift to a low temperature side for a predetermined time or longer.

Abstract: There is provided an exhaust gas purification device for an internal combustion engine that has a turn-back portion in an exhaust gas passageway and is made compact and can cause a reducing agent to be evenly dispersed and flow into a reduction catalyst disposed in an exhaust gas passageway downstream of the turn-back portion.

Abstract: An exhaust gas purification device is provided that is capable of diffusing and introducing a reducing agent into a NOx catalyst arranged in a downstream side exhaust gas passage. The exhaust gas purification device is compact and has an exhaust gas passage that returns back in the middle thereof. A housing of the exhaust gas purification device includes a main body in which an upstream side exhaust gas passage and the downstream side exhaust gas passage are housed, and a cap which is attached to a first surface of the main body that is provided with an outlet side opening of the upstream side exhaust gas passage and an inlet side opening of the downstream side exhaust gas passage. The return portion is formed by a space surrounded by the main body and the cap.

Abstract: There is provided an exhaust gas purification apparatus for an internal combustion engine which can make the exhaust gas in which a reducing agent is diffused uniformly over the entirety flow into an NOx catalyst disposed on the downstream side. An exhaust gas purification apparatus for an internal combustion engine including an NOx catalyst disposed in an exhaust gas passage of an internal combustion engine, and a reducing agent injecting unit for injecting a reducing agent into the exhaust gas passage that is on an upstream side of the NOx catalyst, is characterized in that a narrowed portion in which the cross-sectional area of a flow passage is smaller than the cross-sectional area of the exhaust gas passage and that of the NOx catalyst is provided on a downstream side of an injecting position by the reducing agent injecting unit and the upstream side of the NOx catalyst, and that reducing agent diffusing means is provided on the narrowed portion.