Cooling control device

Abstract

A cooling control device includes a first heat exchanger to which a coolant of an internal combustion engine is supplied, a radiator to which the coolant of is supplied, a coolant pump supplying the coolant, a flow amount control valve controlling a flow amount of the coolant, and a control unit controlling the flow amount control valve. The control unit acquires a first amount of heat which is accumulated in the coolant, a second amount of heat which is accumulated in the coolant by a heat exchange with the first heat exchanger, and a third amount of heat for changing a temperature level of the coolant to a targeted temperature level. A targeted dissipation amount is set from the first, second and third amounts of heat, and an opening of the flow amount control valve is set by a feedforward control.

1 . A cooling control device comprising:
 a radiator to which a coolant of an internal combustion engine is supplied;   a first heat exchanger, other than the radiator, exchanging heat with the coolant;   a coolant pump being driven by the internal combustion engine to circulate the coolant;   a flow amount control valve setting a flow amount of the coolant; and   a control portion setting an opening of the flow amount control valve; wherein the control portion includes   a heat amount acquiring portion acquiring a first amount of heat, a second amount of heat, and a third amount of heat, the first amount of heat that is applied to the coolant by the internal combustion engine in response to a speed of the internal combustion engine and a load applied thereto, the second amount of heat that is applied to the coolant by the first heat exchanger, the third amount of heat that is delivered and received to change a temperature level of the coolant to a targeted temperature level;   a targeted dissipation amount setting portion setting a targeted dissipation amount based on an added value of the first amount of heat, the second amount of heat, and a third amount of heat per unit time acquired by the heat amount acquiring portion; and   an opening setting portion setting a targeted flow amount of the coolant that is to be supplied to the radiator based on the targeted dissipation amount being set by the targeted heat dissipation amount setting portion and based on a heat exchanging efficiency of the radiator, the opening setting portion setting a targeted opening of the flow amount control valve by a feedforward control.   
     
     
         2 . The cooling control device according to  claim 1 , wherein an amount of heat acquired by the heat amount acquiring portion includes a fourth amount of heat that is exchanged between the coolant and a block part of the internal combustion engine, and a fifth amount of heat that is acquired by a temperature difference between the coolant inside a second heat exchanger and a heat exchanging target and by flow amounts thereof, the second heat exchanger that is separately provided from the radiator and the first heat exchanger. 
     
     
         3 . The cooling control device according to  claim 2 , wherein the second heat exchanger corresponds to an oil cooler. 
     
     
         4 . The cooling control device according to  claim 1 , wherein in a case where a deviation between the targeted dissipation amount and an amount of heat acquired by the heat amount acquiring portion decreases lower than a predetermined threshold value, a feedback control is operated to decrease the deviation while a feedforward control is operated. 
     
     
         5 . The cooling control device according to  claim 1 , wherein a targeted response time in which a temperature level of the internal combustion engine is managed is set; and the opening setting portion sets a targeted opening of the flow amount control valve in response to the targeted response time.