| 摘要 |
PURPOSE:To prevent over-cooling of a piston by incorporating such a cooling device as to spray oil to behind the combustion chamber, in which the amount of oil spray is controlled by a valve on the basis of data given from a sensor installed at the exhaust manifold, etc. of the engine. CONSTITUTION:A temp. sensor 11 installed at the exhaust manifold 10 senses the temp. of exhaust gas, and the result is sent to a micro-computer 9. If the sensed temp. is below a specific level, or if the gradient of temperature rise is over a certain value, the micro-computer 9 emits a control signal to shut a solenoid valve 8. Then the oil, which is attracted from a reserver 7 by a strainer 6 and pressurized by an oil pump 5, will pass through the exhaust port of said solenoid valve 8 to return to the reserver 7. Accordingly no oil will be injected from a nozzle 4 to a recessed part 3 of the piston 1 or into the cooling channel 12, to ensure the engine noise during acceleration is reduced as well as over-cooling of the piston 1 prevented. |
