Motor vehicle cooling apparatus with electric motor surge curren

Details Motor vehicle cooling apparatus with electric motor surge curren Motor vehicle cooling apparatus with electric motor surge curren

1998-11-25

2000-10-03

Moulis, Thomas N.

Internal-combustion engines

Cooling

Automatic coolant flow control

F01P 702

Patent

active

061257982

ABSTRACT:
A cooling apparatus for automotive use wherein speed of an electric cooling fan is controlled solely at a predetermined speed. When a relay switch is switched on, voltage of a battery is applied to a lag circuit. Output of the lag circuit is applied to a gate G of a MOS transistor, but rise of the gate-applied voltage is delayed by the lag circuit according to a time constant thereof, and increases slowly. When the gate-applied voltage reaches the threshold voltage of the MOS transistor, the MOS transistor begins to switch on. However, when the gate-applied voltage is low, the drain current flowing through the MOS transistor is limited and thereby surge current at the motor is minimized.

REFERENCES:
patent: 4765284 (1988-08-01), Kanazawa et al.
patent: 5541799 (1996-07-01), Schmidt et al.
patent: 5559656 (1996-09-01), Chokhawala
patent: 5675169 (1997-10-01), Hoshi et al.

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