Abstract: A hydrogen ammonia producing device is configured to produce hydrogen and/or ammonia. The hydrogen ammonia producing device includes an electrochemical cell including an electrode assembly and an electrolyte solution. The electrode assembly has a cathode, a separator and an anode that are sequentially stacked with each other. The anode is in contact with urea. The electrolyte solution is an alkaline aqueous solution. At least one of the anode or the cathode is in contact with the electrolyte solution. The separator is an ion exchange membrane.

Abstract: A rotation acquisition unit acquires a rotation signal correlated with a rotational state of an internal combustion engine. An analysis unit performs frequency analysis of the rotation signal acquired with the rotation acquisition unit. An inter-cylinder determination unit determines whether an inter-cylinder component is smaller than an inter-cylinder threshold representing occurrence of misfire. The inter-cylinder component is a frequency component of an inter-cylinder cycle. The inter-cylinder cycle is computed by dividing an ignition cycle, which is one burning cycle of the internal combustion engine, by a number of cylinders of the internal combustion engine.

Abstract: A rotation acquisition unit acquires a rotation signal correlated with a rotational state of an internal combustion engine. An analysis unit performs frequency analysis of the rotation signal acquired with the rotation acquisition unit. An inter-cylinder determination unit determines whether an inter-cylinder component is smaller than an inter-cylinder threshold representing occurrence of misfire. The inter-cylinder component is a frequency component of an inter-cylinder cycle. The inter-cylinder cycle is computed by dividing an ignition cycle, which is one burning cycle of the internal combustion engine, by a number of cylinders of the internal combustion engine.