A method of regulating the temperature of an engine for an automobile having a radiator, coolant pump, coolant fan and coolant flow regulating valve. The method uses a predictive feedforward element combined with a fuzzy logic controller to achieve accurate control over engine temperature. The fuzzy logic feedback is only utilised in the event that the predictive control results in a cylinder head temperature outside a predetermined range. The system determines the required heat to be output by the radiator, determines the required engine cylinder head temperature and, using a radiator simulation model, determines from the required heat output, a first pump speed, a first fan speed and a first valve position. These values are used for control if the error between the actual and desired cylinder head temperatures is within limits 208, 210.; If not, modifiers to the first values are calculated using fuzzy logic rules and used for control 212.
|Patent number||GB2425619 (A)|
|Publication status||Published - 1 Nov 2006|