초록 ▼

A device and method for cooling an internal combustion engine is disclosed in which a simple control circuit constructed of relatively inexpensive components enables the rotational speed of an electric motor employed in the cooling device to be controlled in adaptation to various temperature levels

A device and method for cooling an internal combustion engine is disclosed in which a simple control circuit constructed of relatively inexpensive components enables the rotational speed of an electric motor employed in the cooling device to be controlled in adaptation to various temperature levels of a cooling circuit. The control circuit includes a power semiconductor which is used to drive the electric motor in certain speed ranges associated with predetermined temperature levels. The control circuit also incorporates a bypass circuit that permits the electrical motor to be driven in particular speed ranges without the use of the power semiconductor. Thus, the electric motor can be driven at one hundred percent of its speed capacity by eliminating a voltage drop associated with the power semiconductor.

대표청구항 ▼

A method for controlling a cooling device for an internal combustion engine, said method comprising the steps of: successively switching contacts of a temperature sensitive sensor of a control circuit for said cooling device when predetermined switching thresholds are reached to change an input para

A method for controlling a cooling device for an internal combustion engine, said method comprising the steps of: successively switching contacts of a temperature sensitive sensor of a control circuit for said cooling device when predetermined switching thresholds are reached to change an input parameter to a non-inverting input of an operational amplifier provided in said control circuit; driving a power semiconductor device included in said control circuit with an output of said operational amplifier in such a manner that an electric motor connected to said semiconductor device coupled to at least one of a fan and cooling water pump is operated at certain rotational speeds allocated in steps to respective switching thresholds, and bypassing said power semiconductor device to drive said electric motor when a last switching contact closes by connecting said electric motor directly to said last switching contact.