Abstract: A hydrogen-system control device according to the present embodiment is a control system for a hydrogen system that produces hydrogen: a first setter; a second setter configured to set an actual power consumption amount obtained by reducing a reduced power amount from the first power consumption amount in advance, when the demand response for reducing the first power consumption amount in the request period is requested the device comprising: and a controller configured to control a power amount of the second power in the request period based on the actual power consumption amount. The second setter is configured to set the actual power consumption amount in a range in which the hydrogen system is able to achieve a target amount of hydrogen to be produced in a first period that includes the request period and is longer than the request period.

Abstract: A multicylinder engine cooling apparatus includes: an exhaust side cooing passage individually formed to extend in an exhaust side of the cylinder head in which the plurality of exhaust pipes are disposed; an intake side cooling passage individually formed to extend in an intake side of the cylinder head in which the plurality of intake pipes are disposed; a first downstream cooling water passage through which the cooling water having passed through the exhaust side cooling passage flows; a second downstream cooling water passage that allows the cooling water having passed through the exhaust side cooling passage and then the intake side cooling passage to flow to the first downstream cooling water passage at some midpoint of the first downstream cooling water passage; and a switching valve that switches a flow passage of the cooling water discharged from the exhaust side cooling passage between the intake side cooling passage and the first downstream cooling water passage.

Abstract: A multicylinder engine cooling apparatus includes: an exhaust side cooing passage individually formed to extend in an exhaust side of the cylinder head in which the plurality of exhaust pipes are disposed; an intake side cooling passage individually formed to extend in an intake side of the cylinder head in which the plurality of intake pipes are disposed; a first downstream cooling water passage through which the cooling water having passed through the exhaust side cooling passage flows; a second downstream cooling water passage that allows the cooling water having passed through the exhaust side cooling passage and then the intake side cooling passage to flow to the first downstream cooling water passage at some midpoint of the first downstream cooling water passage; and a switching valve that switches a flow passage of the cooling water discharged from the exhaust side cooling passage between the intake side cooling passage and the first downstream cooling water passage.