Apparatus for controlling temperature of internal combustion engine

An apparatus for controlling the temperature of an internal combustion engine, comprising:

• fluid temperature sensing means for sensing the temperature of a working fluid of the engine which is capable of exchanging heat with the engine, said working fluid being the lubricating oil of the engine,
• condition detecting means for detecting the engine operating conditions,
• reference means for continuously finding, in response to the engine operating conditions detected by said condition detecting means, a predetermined reference temperature of said working fluid which is varied according to a function of the engine operating condition,
• controller means which compares the temperature sensed by said fluid temperature sensing means with the reference temperature found by said reference means to find the error therebetween and produces a control signal in accordance with said error,
• fluid temperature regulating means for regulating the temperature of said working fluid in response to said control signal which is manipulated so as to bring the temperature of said working fluid closer to said reference temperature.

An apparatus for controlling the temperature of an internal combustion engine, comprising;

• a plurality of fluid temperature sensing means each for sensing the temperature of each one of different kinds of working fluids which are capable of exchanging heat with the engine,
• condition detecting means for detecting the engine operating conditions,
• means for finding, in response to the detected engine operating conditions, each reference temperature of said working fluids which is a function of the engine operating conditions,
• controller means which compares the sensed temperature of each of said working fluids with the corresponding reference temperature to find the error therebetween and produces each control signal of said working fluids in accordance with the corresponding error,
• a plurality of fluid temperature regulating means each for regulating the temperature of each one of said working fluids in response to the corresponding control signal which is manipulated so as to bring the temperature of the working fluid closer to the reference temperature.

An apparatus for controlling the temperature of an internal combustion engine, comprising:

• fluid temperature sensing means for sensing the temperature of a working fluid of the engine which is capable of exchanging heat with the engine,
• condition detecting means for detecting the engine operating conditions,
• reference means for continuously finding, in response to the engine operating conditions detected by said condition detecting means, a predetermined reference temperature of said working fluid which is varied according to a function of the engine operating condition,
• controller means which compares the temperature sensed by said fluid temperature sensing means with the reference temperature found by said reference means to find the error therebetween and produces a control signal in accordance with said error,
• fluid temperature regulating means for regulating the temperature of said working fluid in response to said control signal which is manipulated so as to bring the temperature of said working fluid closer to said reference temperature, said fluid temperature regulating means comprising timing control means capable of retarding the timing of ignition of the engine in accordance with said error so as to lower the engine temperature when the temperature of the working fluid is above the reference temperature while maintaining a predetermined normal ignition timing schedule of the engine when the temperature of the working fluid is below the reference temperature.