Fan drive control method and battery overheat protection device in battery overheat protection device

摘要

PPROBLEM TO BE SOLVED: To enable drive control of a cooling fan so as to be able to prevent abnormal overheating of a battery securely by detecting abnormality of a speed control signal input from the outside. PSOLUTION: When it is detected if the speed control signal input to a motor main control part 102 from the outside is in a first abnormal state equivalent to a short circuit state of a harness 2 for a signal or in a second abnormal state equivalent to an open state of the harness 2 for the signal, in the case of being in the first abnormal state, the cooling fan 1 is driven at a prescribed number of revolutions Vb, and also in the case of the second abnormal state, the cooling fan 1 is arranged so as to be driven at the prescribed number of the revolutions Vb, the cooling fan 1 is automatically put into a driving state of an appropriate speed at the abnormality of the speed control signal, and overheating protection of the battery can be realized surely. PCOPYRIGHT: (C)2008,JPO&INPIT