| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate friction loss and worsening of exhaust air composition rapidly by heating the vicinity of a cylinder locally at the time of cold start. SOLUTION: A heat storage material storage chamber 12 is formed in a cylinder block 11 so as to surround a cylinder, and a latent heat type heat storage material 13 composed of sodium acetate trihydrate is filled therein. The heat storage material 13 receives heat directly from the cylinder and becomes a liquid phase to store latent heat. At the time of cold start, a shock is given to the heat storage material 13 cooled excessively by the voltage application of an electrode 15 to start the change of phase and generate latent heat. A temperature of the heat storage material 13 is detected by a temperature sensor 14 to judge whether heat radiation is possible or not based on the history of temperatures. A voltage is applied only when heat radiation is possible and an engine temperature at the time of its start is low. A cylinder head 18 having high heat load has a water jacket 19 and is cooled by the forced circulation of cooling water.</p> |
