Abstract: An internal combustion engine includes a circulation system which circulates a heat medium, a cylinder head part channel which circulates the heat medium into a cylinder head, a cylinder block part channel which circulates the heat medium into a cylinder block, a connecting channel which connects the cylinder head part channel with the cylinder block part channel, a heat supply device that supplies heat accumulated in the regenerator to the internal combustion engine, and restraining device that restrains heat circulation in the connecting channel when heat is supplied by the heat supply device or the internal combustion engine is under cold conditions.

Abstract: Disclosed is a technology capable of efficiently supplying a heater core 12 or a heat accumulation system 15 or an internal combustion engine body 1 with cooling water heated by a cooling water heating mechanism 20 by restraining an unnecessary heat radiation from the cooling water in an internal combustion engine including the heat accumulation system.

Abstract: A warm-up control device for an internal-combustion engine comprises a heat storage device for storing a heating medium heated during operation of the engine, supplies the heating medium stored in the heat storage device to a drive device (a transmission and the like) prior to the start of the engine or at the start of the engine, and supplies the heating medium stored in the heat storage device to the drive device while maintaining a condition where the heating medium is circulated in the path excluding the heat storage device and including the drive device after the start of the engine.

Abstract: The internal combustion engine includes an engine preheating apparatus for preheating the internal combustion engine upon or before starting thereof. This internal combustion engine further includes an air-fuel ratio controller for setting an air-fuel ratio of the internal combustion engine that is preheated, to a value higher than that of the internal combustion engine that is not preheated, and/or an ignition-timing controller for retarding an ignition timing of the internal combustion engine that is preheated as compared with the ignition timing of the internal combustion engine that is not preheated.

Abstract: According to an internal combustion engine of the invention, release operation of an antitheft device is selected as an event generating by necessity prior to the starting of an engine, and the pre-heat is started based on the generating timing of the selected event. The start timing of the release operation of the antitheft device is high in terms of both necessity as an event generating prior to the starting of the engine and reproducibility of the time length from its start timing to an arbitrary starting timing of the engine. The pre-heat completed state can be secured by starting the pre-heat synchronously with this timing or at a predetermined timing based on the timing, even when the engine is started at an arbitrary timing. Exhaust characteristics and fuel consumption performance can be improved by optimizing the temperature distribution of the engine at starting.

Abstract: An electronic control unit (ECU) of an engine system starts a control (preheat) that supplies heat reserving hot water stored in a heat accumulating device to an engine prior to an engine start. The ECU determines a time that continues the preheat on the basis of a cooling water temperature of the engine so as to execute the engine start after a warming-up of the engine is reliably finished. Further, during the execution of the preheat, a lighting lamp is turned on, and that incidence is recognized to a driver. When the preheat is completed, the ECU automatically starts the engine.