Abstract: An exhaust gas control apparatus and method for an engine includes a urea water supply mechanism that adds urea water to exhaust gas, a SCR catalyst that adsorbs ammonia and removes NOx in the exhaust gas by using the adsorbed ammonia, and a control device that controls a urea water addition amount based on a target adsorption amount for the ammonia adsorbed onto the SCR catalyst. The control device executes an integration processing that acquires a temperature of the SCR catalyst at a predetermined cycle and integrates the acquired temperature of the SCR catalyst when equal to or higher than a threshold, and an initialization processing that decreases the amount of the ammonia adsorbed on the SCR catalyst on a condition that an integrated value of the temperature of the SCR catalyst calculated in the integration processing has become equal to or higher than a predetermined value.

Abstract: An exhaust gas control apparatus for an internal combustion engine includes a urea water injection valve, a catalyst disposed in an exhaust passage downstream of the injection valve, and an electronic control unit. The injection valve is configured to add urea water to exhaust gas. The catalyst is configured to adsorb ammonia generated from the urea water. The electronic control unit is configured to (i) set a target adsorption amount of the ammonia adsorbed on the catalyst, (ii) control the injection valve such that the amount of the urea water added to the exhaust gas becomes an addition amount calculated based on the target adsorption amount, and (iii) execute an initialization processing for decreasing the amount of the ammonia adsorbed on the catalyst to (zero) when an integrated value of the amount of the NOx flowing into the catalyst is equal to or higher than a predetermined value.

Abstract: An exhaust gas control apparatus includes an exhaust passage, a urea water tank, a urea adding valve, a urea pump, a pipe, and an electronic control unit. The electronic control unit is configured to drive the urea pump to perform a filling control when a condition requiring an execution of urea water addition to the exhaust gas in the exhaust passage by the urea adding valve is satisfied so that the pipe is filled with the urea water. The electronic control unit is configured to execute the filling control when an exhaust pressure of the exhaust passage is equal to or less than a specified value. The electronic control unit is configured to stop the filling control when the exhaust pressure of the exhaust passage exceeds the specified value during the execution of the filling control.

Abstract: An exhaust gas control apparatus and method for an engine includes a urea water supply mechanism that adds urea water to exhaust gas, a SCR catalyst that adsorbs ammonia and removes NOx in the exhaust gas by using the adsorbed ammonia, and a control device that controls a urea water addition amount based on a target adsorption amount for the ammonia adsorbed onto the SCR catalyst. The control device executes an integration processing that acquires a temperature of the SCR catalyst at a predetermined cycle and integrates the acquired temperature of the SCR catalyst when equal to or higher than a threshold, and an initialization processing that decreases the amount of the ammonia adsorbed on the SCR catalyst on a condition that an integrated value of the temperature of the SCR catalyst calculated in the integration processing has become equal to or higher than a predetermined value.

Abstract: An exhaust purifying apparatus for an internal combustion engine includes a NOx removing catalyst, an oxidation catalyst, and a controller which is configured to calculate the amount of NOx contained in exhaust gas that has passed through the oxidation catalyst. The controller is configured to execute an abnormality diagnosis process that determines the existence of an abnormality in the NOx removing catalyst if NOx removal efficiency obtained from the amount of NOx is less than or equal to a predetermined value. The controller is configured to execute the abnormality diagnosis process after executing a desorption process that desorbs unburned fuel adsorbed by the NOx removing catalyst if an execution condition of the abnormality diagnosis process is met.

Abstract: An exhaust gas control apparatus for an internal combustion engine includes a urea water injection valve, a catalyst disposed in an exhaust passage downstream of the injection valve, and an electronic control unit. The injection valve is configured to add urea water to exhaust gas. The catalyst is configured to adsorb ammonia generated from the urea water. The electronic control unit is configured to (i) set a target adsorption amount of the ammonia adsorbed on the catalyst, (ii) control the injection valve such that the amount of the urea water added to the exhaust gas becomes an addition amount calculated based on the target adsorption amount, and (iii) execute an initialization processing for decreasing the amount of the ammonia adsorbed on the catalyst to (zero) when an integrated value of the amount of the NOx flowing into the catalyst is equal to or higher than a predetermined value.

Abstract: An exhaust gas control apparatus includes an exhaust passage, a urea water tank, a urea adding valve, a urea pump, a pipe, and an electronic control unit. The electronic control unit is configured to drive the urea pump to perform a filling control when a condition requiring an execution of urea water addition to the exhaust gas in the exhaust passage by the urea adding valve is satisfied so that the pipe is filled with the urea water. The electronic control unit is configured to execute the filling control when an exhaust pressure of the exhaust passage is equal to or less than a specified value. The electronic control unit is configured to stop the filling control when the exhaust pressure of the exhaust passage exceeds the specified value during the execution of the filling control.

Abstract: An exhaust purifying apparatus for an internal combustion engine includes a NOx removing catalyst, an oxidation catalyst, and a controller which is configured to calculate the amount of NOx contained in exhaust gas that has passed through the oxidation catalyst. The controller is configured to execute an abnormality diagnosis process that determines the existence of an abnormality in the NOx removing catalyst if NOx removal efficiency obtained from the amount of NOx is less than or equal to a predetermined value. The controller is configured to execute the abnormality diagnosis process after executing a desorption process that desorbs unburned fuel adsorbed by the NOx removing catalyst if an execution condition of the abnormality diagnosis process is met.

Abstract: A new separator for an alkaline cell is provided, which can prevent deformation to an end of the separator and also prevent short circuits within the cell structure when an external force is added to the cell. The separator has a characteristic that a ratio of a tensile strength of a longitudinal direction of a separator base paper and a tensile strength of a widthwise direction of the base paper is within a range of 2/1 to 1/1. The invention provides a new method of producing the separator. The method permits reliability in sealing properties of a closed bottom end and high productivity. The method has the steps of: winding the base paper to form a cylindrical body; subjecting the cylindrical body to a closed bottom forming step while the cylindrical body is held by a clamping device to maintain its cylindrical shape; heat-bonding an end of the cylindrical body to close the end; and releasing the cylindrical body from the cylindrical clamping device.