| 摘要 |
A water cooling system for a locomotive engine that enables the engine to operate at a maximum power level that generates a maximum permissible engine cooling water temperature corresponding to a particular ambient air temperature. The water cooling system can be either an open-loop or a closed-loop controlled system. In the open-loop control system, an ambient air temperature sensor measures the ambient air temperature. When the ambient air temperature exceeds a predetermined value, a signal from the temperature sensor to a signal processor automatically causes the engine power to derate in accordance with the temperature such that the heat generated by the engine maintains the water temperature of the cooling water constant. An ambient pressure sensor senses ambient pressure such that a correction factor is supplied to correct for cooling losses at higher altitude. In the closed loopsystem, the signal processor generates an error signal as the difference in the maximum allowable engine-out water temperature and the measured water temperature. The signal processor then generates a signal causing the engine power to derate such that the heat generated by the engine maintains the water temperature near the specified design limit. A throttle notch 8 to 6 knock-down cooling procedure is also incorporated as a safety mechanism in the event that the other cooling system fails.
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