Patent Document ID: 20060288967
Application ID: 11387039
Patent Flag: 0

Claim One:
1. A method of regulating the temperature of an engine for an automobile having a radiator, a coolant pump, a coolant fan and a coolant flow regulating valve, the method comprising the steps of: a) determining a required radiator heat rejection; b) determining a required engine cylinder head temperature; c) determining a first pump speed a first fan speed and a first valve position in dependence upon the required heat rejection and a radiator simulation model; d) determining a cylinder head temperature error in dependence on a measured cylinder head temperature and the required cylinder head temperature; in the event that said error is outside a predetermined range e) determining a pump speed modifier, a fan speed modifier and a valve position modifier in dependence upon fuzzy logic rules; f) setting the fan speed in dependence upon the first fan speed and said fan speed modifier; g) setting the pump speed in dependence upon the first pump speed and the pump speed modifier; and h) setting the valve position in dependence upon the first valve position and the valve position modifier; and in the event that said error is within said predetermined range i) setting the fan speed in dependence upon the first fan speed; j) setting the pump speed in dependence upon the first pump speed; and k) setting the valve position in dependence upon the first valve position.