Patent ID: 6044809
Filing Date: 2000-04-04
Classification: F01P

Abstract:
A method of controlling a vehicle engine coolant fan, comprising the steps of:a) determining if a cruise control is deactivated;b) if the cruise control is activated, determining if the vehicle speed exceeds a set speed plus a predetermined delta;c) determining if either of (a) and (b) is positive;d) determining if the engine is unfueled;e) if the engine is fueled, determining if either a service brake or an engine compression brake is activated;f) determining if either of (d) and (e) is positive;g) determining if the top tank temperature exceeds a first predetermined temperature;h) requesting activation of a coolant fan if the determinations of (c), (f), and (g) are each positive;j) while requesting the activation of the coolant fan, repeating steps (a) through (f);k) while requesting the activation of the coolant fan, determining if the top tank temperature is above a second predetermined temperature; andl) ceasing to request the activation of the coolant fan if the determinations of (c), (f), and (k) do not each remain positive.