PURPOSE: To perform control in high accuracy without causing the surging phenomenon, when a various controller is controlled in accordance with temperature of an engine, by performing the control on the basis of a mean value of wall surface temperature in the engine for a prescribed period.
CONSTITUTION: For instance, in driving control of a water pump, a signal of engine wall surface temperature from a sensor 14 is converted to a voltage signal by a temperature detector circuit 23 in a control circuit 13, and a mean value in a sampling period signal from an oscillator circuit 24 is arithmetically obtained by an equalizer circuit 25 to control rotation of the water pump through a motor 12 by sampling output of a sampling circuit 26 via an output current control circuit 27 and amplifier circuit 28. Accordingly, dividing of the pump is controlled directly by surface wall temperature further on the basis of mean value in a prescribed period, not to be influenced by a thermal cycle, and the control can be accurately performed without causing the surging phenomenon.
MORITA YASUYUKI
YOKOOKU KATSUHIKO
TAKAMORI YUUJI
