Abstract: An electronically controlled thermostat control method is obtained which makes it possible to eliminate the response delay from the time that the required cooling water temperature is set to the time that the actual cooling water temperature reaches the set water temperature by controlling the flow rate, and to realize high cooling water temperature tracking characteristics with a high degree of precision at a low cost.

Abstract: A method for controlling an electronically controlled thermostat provided in a cooling system of an internal combustion engine includes predicting a thermal radiation amount of a radiator when a water temperature of engine cooling water is stabilized at a second set temperature or at a first set temperature without detecting the water temperature not to cause temperature hunting, when the water temperature is controlled from a first set temperature to the second set temperature lower than the first set temperature or from the second set temperature to the first set temperature. The electronically controlled thermostat is controlled in accordance with the predicted thermal radiation amount.

Abstract: An electronically controlled thermostat control method is obtained which makes it possible to eliminate the response delay from the time that the required cooling water temperature is set to the time that the actual cooling water temperature reaches the set water temperature by controlling the flow rate, and to realize high cooling water temperature tracking characteristics with a high degree of precision at a low cost.

Abstract: The present invention performs cooling water temperature control appropriately and efficiently in accordance with the load of an automobile engine, is superior in terms of responsiveness and stability, prevents the generation of overshooting, hunting, and so forth, and permits a greater improvement in the automobile fuel consumption. When the engine cooling water temperature is controlled from a first set temperature (high temperature) to a lower second set temperature (low temperature), or, conversely, from the second set temperature to the first set temperature, the radiator thermal radiation amount when stabilized at the low set temperature or high set temperature is predicted rather than detection of the cooling water temperature being performed, so that temperature hunting does not occur, and cooling water temperature control is performed by controlling the electronically controlled thermostat in accordance with this predicted value.

Abstract: A sound synthesizing method and apparatus for producing synthesized sounds having a property similar to the property of natural sounds emitted from a natural acoustic tube having a variable cross-sectional area. The natural acoustic tube is replaced by a series connection of a plurality of acoustic tubes each having a variable cross-sectional area. The acoustic tube series connection is replaced by an equivalent electric circuit connected between a power source circuit and a sound radiation circuit. The equivalent electric circuit includes a parallel connection of first and second electric circuits equivalent for adjacent first and second acoustic tubes of the acoustic tube series connection. The first electric circuit includes input and output side sections each including a propagated current source and a surge impedance element having a surge impedance inversely proportional to the cross-sectional area of the first acoustic tube.