| 摘要 |
<p>Method and device for the cooling of internal combustion engines in order to reduce the corrosive wear of cylinder barrels and piston rings. The corrosion substantially is caused by the sulphur content of the fuel. In a Diesel engine the combustion of the fuel always takes place at a relatively great air excess, which implies that the formation of sulphur trioxide exceeds the formation of sulphur dioxide. Together with the water vapour in the flue gases, in addition to sulphurous acid the stronger sulphuric acid is formed. The corrosion in combination with the mechanic wear results in a much too short life of the cylinder liners and piston rings and constitutes a significant economic burden. Known tests show for the corrosion of steel in flue gas with 0, 01 and 0, 02% SO3-content a very distinctive maximum at about 150 C, but corrosion minima on both sides of said maximum. The corrosion now can be reduced in that the surface temperature for cylinder barrels and piston rings is maintained below the lower temperature limit for risked corrosion maxima due to SO3-content in the flue gas by tempering the coolant while the engine is subjected to a load up to a certain partial load, and that at increasing output and upon arrival at said partial load the tempering of the coolant causes an abrupt increase in the surface temperature to a value above the upper temperature limit for said risked corrosion maxima, and that the surface temperature thereafter is maintained above this value by the tempering of the coolant. </p> |
