Apparatus for detecting a malfunction in a radiator fan system

摘要

A malfunction detecting apparatus of a radiator fan system includes a steady-state discrimination unit (100 - 108) which detects whether an operating condition of an internal combustion engine (10) is in a steady state. A temperature change measuring unit (206, 220 - 226) measures a change in a temperature of cooling water of the engine when the operating condition of the engine is detected to be in the steady state and a control signal to start rotation of a cooling fan (18) of the radiator fan system is output. A malfunction detecting unit (232 - 238) detects that a malfunction in the radiator fan system has occurred, when the temperature change measured by the temperature change measuring unit is smaller than a reference value.