Vehicle cooling system with electric motor overcurrent inhibitin

Details Vehicle cooling system with electric motor overcurrent inhibitin Vehicle cooling system with electric motor overcurrent inhibitin

1998-12-15

2000-01-25

Tanner, Harry B.

Automatic temperature and humidity regulation

Cooling radiator

Air control

361 24, 361 31, 123 4112, F01P 704

Patent

active

060169656

ABSTRACT:
A vehicle cooling system including a motor control apparatus that controls operation of a system motor when a cooling fan driven by the motor locks due to foreign matter interference or freezing. When motor input current is detected to be overcurrent, the controller limits the current flow. When current flowing to the electric motor is detected to be overcurrent and ambient air temperature is at or above a predetermined temperature, the controller stops energization of the motor. Thus, when the cooling fan freezes and locks, energization of the motor is maintained until ambient air temperature reaches or exceeds the predetermined temperature. Therefore, when the frozen-locked state is eliminated due to a subsequent temperature rise, an ordinary operating state can again be obtained without the controller subsequently detecting surge current, generated as a result of the motor being re-started from a fully stopped state, as overcurrent and therefore incorrectly stopping motor energization. Additionally, when locking occurs due to foreign matter interfering with fan rotation, an overcurrent state is detected even when ambient air temperature is at or above the predetermined temperature, and motor energization is immediately stopped.

REFERENCES:
patent: 4329725 (1982-05-01), Hart
patent: 4590772 (1986-05-01), Nose et al.
patent: 4651922 (1987-03-01), Noba
patent: 4752851 (1988-06-01), Ritter
patent: 5448143 (1995-09-01), Pecone

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