Patent ID: 6857576

Claim:
A method for controlling an electronic thermostat valve, comprising: control logic for changing a geometrical volume of a thermal element chamber wherein said control logic sends a controlling signal to an actuator means based on calculation of the optimal coolant temperature(component temperature)in a combustion engine, whereby the coolant temperature at which the thermostat valve opens an controls can be varied within a preferable temperature range; wherein said temperature differential calculation comprises calculating and outputting a difference (ΔT avail ) between the temperature of coolant at an outlet of the engine (T CEO ) and the temperature of coolant at an outlet of the radiator (T RO ); presetting a reference value (ΔT ref ) between reference temperature of coolant at the outlet of the engine and a reference temperature of coolant at the outlet of the radiator; calculating and outputting a difference of ΔT ref and ΔT avail ; outputting a first control signal by means of an OR gate based at least in part on said ΔT ref and ΔT avail ; and outputting a second controlling signal by means of an AND gate for selectively controlling said chamber volume based on said first control signal and a current coolant temperature.