Abstract: An exhaust gas processing device includes a NOx detection sensor, a first catalyst provided to a first branch pipe, a second catalyst provided to a second branch pipe, a first pressure sensor and a second pressure sensor which are arranged on the upstream side of the first catalyst and the second catalyst and which detect pressures in the first branch pipe and the second branch pipe, and a control device that obtains flow rates of exhaust gas flowing through the first branch pipe and the second branch pipe based on detection values of the first pressure sensor and the second pressure sensor and obtains amounts of reducing agent to be given to the first catalyst and the second catalyst from the obtained flow rates and a concentration of NOx of the exhaust gas.

Abstract: An exhaust gas purifying device includes a first branch pipe and a second branch pipe that cause exhaust gas exhausted from a diesel engine to branch into a plurality of passages and pass through the passages, a first exhaust gas purification unit and a second exhaust gas purification unit that purify the exhaust gas, an exhaust gas temperature sensor that detects a temperature of the exhaust gas, an atmospheric pressure sensor, and a processing unit that obtains a convergence portion pressure at a convergence portion from a relationship obtained in advance between the convergence portion pressure, a total flow rate of the exhaust gas, a convergence portion temperature, and an atmospheric pressure.

Abstract: An exhaust gas purifying device includes a first branch pipe and a second branch pipe that cause exhaust gas exhausted from a diesel engine to branch into a plurality of passages and pass through the passages, a first exhaust gas purification unit and a second exhaust gas purification unit that purify the exhaust gas, an exhaust gas temperature sensor that detects a temperature of the exhaust gas, an atmospheric pressure sensor, and a processing unit that obtains a convergence portion pressure at a convergence portion from a relationship obtained in advance between the convergence portion pressure, a total flow rate of the exhaust gas, a convergence portion temperature, and an atmospheric pressure.

Abstract: An exhaust gas processing device includes a NOx detection sensor, a first catalyst provided to a first branch pipe, a second catalyst provided to a second branch pipe, a first pressure sensor and a second pressure sensor which are arranged on the upstream side of the first catalyst and the second catalyst and which detect pressures in the first branch pipe and the second branch pipe, and a control device that obtains flow rates of exhaust gas flowing through the first branch pipe and the second branch pipe based on detection values of the first pressure sensor and the second pressure sensor and obtains amounts of reducing agent to be given to the first catalyst and the second catalyst from the obtained flow rates and a concentration of NOx of the exhaust gas.