Abstract: An electric power system includes a plurality of power adjustment resources electrically connectable to a power grid, and a management device configured to manage the power adjustment resources. The management device is configured to acquire a first request signal for requesting demand-and-supply adjustment in the power grid, and a second request signal for requesting the power adjustment resources to adjust electric energy in a predetermined period, transmit a power command signal indicating a command power value for each predetermined interval in the predetermined period to a predetermined power adjustment resource included in the power adjustment resources, and generate the power command signal to respond to both requests of the first request signal and the second request signal.

Abstract: An ammonia selective reduction-type NOx catalyst (48) is interposed in an exhaust passage of an engine (2) provided in a series-type hybrid electric vehicle (1), and a urea water injector (52) is disposed in the exhaust passage to supply a urea water into exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst (48). The engine (2) is started and stopped in accordance with the storage state of a battery (8), and the urea water injector (52) is controlled in accordance with the operating state of the engine (2). When the engine (2) is to be stopped, an adsorption increasing operation for increasing the amount of ammonia adsorbed by the ammonia selective reduction-type NOx catalyst (48) is executed over a predetermined period before the engine (2) is stopped.

Abstract: An ammonia selective reduction-type NOx catalyst (48) is interposed in an exhaust passage of an engine (2) provided in a series-type hybrid electric vehicle (1), and a urea water injector (52) is disposed in the exhaust passage to supply a urea water into exhaust gas existing upstream of the ammonia selective reduction-type NOx catalyst (48). The engine (2) is started and stopped in accordance with the storage state of a battery (8), and the urea water injector (52) is controlled in accordance with the operating state of the engine (2). When the engine (2) is to be stopped, an adsorption increasing operation for increasing the amount of ammonia adsorbed by the ammonia selective reduction-type NOx catalyst (48) is executed over a predetermined period before the engine (2) is stopped.

Abstract: A voltage converting circuit for electric vehicles that is capable of stably performing precharge control from a high voltage battery to an inverter. The voltage converting circuit includes a high voltage battery for supplying electric power to a vehicle drive motor; and an inverter, which is interposed between the high voltage battery and the vehicle drive motor and has a capacitor, for converting a direct current, supplied from the high voltage battery, to an alternating current and supplying to the vehicle drive motor.

Abstract: A battery charging system for hybrid electric vehicles that is capable of charging a low voltage battery with good energy efficiency. The battery charging system includes a high voltage battery for supplying electric power to a vehicle drive motor; and a voltage converter for converting a voltage, input from the high voltage battery, to a first voltage and outputting the first voltage. The battery charging system further includes a low voltage battery that is charged with the first voltage from the voltage converter; and an alternator, which is driven by an engine, connected with the low voltage battery in parallel with the voltage converter. The output voltage of the alternator is lower than the first voltage and higher than the rated voltage of the low voltage battery.

Abstract: A voltage converting circuit for electric vehicles that is capable of stably performing precharge control from a high voltage battery to an inverter. The voltage converting circuit includes a high voltage battery for supplying electric power to a vehicle drive motor; and an inverter, which is interposed between the high voltage battery and the vehicle drive motor and has a capacitor, for converting a direct current, supplied from the high voltage battery, to an alternating current and supplying to the vehicle drive motor.