Abstract: A coolant thermoelectric generation system may include a thermoelectric module 20 connected to a high temperature line 13 through which engine coolant flows and a low temperature line 24 through which coolant having a temperature lower than a temperature of the engine coolant flows, and configured to perform thermoelectric generation with a heat exchange effect based on a coolant temperature difference between the engine coolant and the coolant having a temperature lower than a temperature of the engine coolant with a thermoelectric element 21 interposed therebetween; a heat exchange line 16, in which the heat exchange effect occurs, and a bypass line 17, in which no heat exchange effect occurs, the heat exchange line and the bypass line connected to the high temperature line to form two paths, respectively 13; and built-in valves 14, 14-1, 14-2 located in the internal space of the thermoelectric module, and configured to adjust flow rates of the coolant in the heat exchange line and the bypass line.

Abstract: A complex heat exchanger includes: a lower plate including a coolant inlet and a coolant outlet, an EGR gas inlet and an EGR gas outlet, and an oil inlet and an oil outlet. The inlets allow coolant, EGR gas, and oil to be introduced through the inlets, respectively, and the outlets allow the coolant, EGR gas, and oil to be discharged through them, respectively. The complex heat exchanger further includes a heat exchanging part stacked on top of the lower plate, and the heat exchanging part includes a coolant passage, an EGR gas passage, and an oil passage, which are separately formed in an interior of the heating exchanging part, allowing the coolant, the EGR gas, and the oil to separately flow while heating and cooling each other. An upper plate of the complex heat exchanger is coupled on top of the heat exchanging part.

Abstract: A cooling apparatus for EGR gas and engine oil may include coolant lines through which coolant circulates, an EGR heat exchange part provided between the coolant lines, wherein the EGR gas circulates through the EGR heat exchange part so as to exchange heat with the coolant, a bypass part spaced apart from the EGR heat exchange part, wherein the EGR gas circulates through the bypass part, or bypasses the bypass part so as not to exchange heat with the EGR heat exchange part, an oil heat exchange part provided on the coolant lines and spaced apart from the EGR heat exchange part, wherein engine oil circulates through the oil heat exchange part so as to exchange heat with the coolant, and a control valve provided at an entrance side of the EGR heat exchange part so as to control circulation of the EGR gas into the oil heat exchange part.

Abstract: Disclosed are an apparatus for adjusting temperature of oil for a vehicle, and a method for controlling the apparatus. The apparatus includes an EGR valve installed on a fluid channel branching off from an exhaust pipe, a complex heat exchanger structured to transfer exhaust gas having passed through the EGR valve to an engine intake pipe via an EGR cooling path in which the exhaust gas having passed through the EGR valve performs heat exchange with coolant, an oil heating path in which the exhaust gas having passed through the EGR valve performs heat exchange with oil, and a bypass path in which the exhaust gas having passed through the EGR valve does not perform heat exchange, an NOx sensor installed in the exhaust pipe, and a controller that controls the complex heat exchanger in response to a signal from the NOx sensor.

Abstract: A heat exchanger using Exhaust Gas Recirculation (EGR) gas may include a cooling water line including cooling water flowing therein, an EGR line including EGR gas flowing therein and directly exchange heat between the EGR gas and the cooling water in the cooling water line, and an oil line including oil flowing therein and indirectly exchange heat between the oil and the EGR gas through the cooling water while directly exchanging heat between the oil and the cooling water in the cooling water line.

Abstract: A method for diagnosing a bypass valve on an oil cooling circuit for vehicles includes: a measurement step of measuring a temperature of a downstream oil of the bypass valve, a prediction step, and a diagnosis step. The prediction step compares the temperature of the downstream oil with an opening reference temperature or a closing reference temperature and predicts an open or closed state of the bypass valve. The diagnosis step depending on a result of the prediction step, compares the temperature of the downstream oil with a lowest reference temperature or a highest reference temperature and diagnoses whether the bypass valve is in a failure state in which the bypass valve is stuck in an open or closed state.

Abstract: Disclosed are an apparatus for adjusting temperature of oil for a vehicle, and a method for controlling the apparatus. The apparatus includes an EGR valve installed on a fluid channel branching off from an exhaust pipe, a complex heat exchanger structured to transfer exhaust gas having passed through the EGR valve to an engine intake pipe via an EGR cooling path in which the exhaust gas having passed through the EGR valve performs heat exchange with coolant, an oil heating path in which the exhaust gas having passed through the EGR valve performs heat exchange with oil, and a bypass path in which the exhaust gas having passed through the EGR valve does not perform heat exchange, an NOx sensor installed in the exhaust pipe, and a controller that controls the complex heat exchanger in response to a signal from the NOx sensor.

Abstract: A cooling apparatus for EGR gas and engine oil may include coolant lines through which coolant circulates, an EGR heat exchange part provided between the coolant lines, wherein the EGR gas circulates through the EGR heat exchange part so as to exchange heat with the coolant, a bypass part spaced apart from the EGR heat exchange part, wherein the EGR gas circulates through the bypass part, or bypasses the bypass part so as not to exchange heat with the EGR heat exchange part, an oil heat exchange part provided on the coolant lines and spaced apart from the EGR heat exchange part, wherein engine oil circulates through the oil heat exchange part so as to exchange heat with the coolant, and a control valve provided at an entrance side of the EGR heat exchange part so as to control circulation of the EGR gas into the oil heat exchange part.

Abstract: An electric water pump control apparatus actively controls an electric water pump in a high speed range or a high load condition as a vehicle accelerates or overtakes. An electric water pump control method may include determining whether an engine is in a high speed/high load condition or in a normal condition by detecting an engine speed, fuel consumption amount, and coolant temperature, determining whether the coolant temperature is less than a predetermined second temperature, if the engine is in a high speed/high load condition, calculating a speed of the electric water pump by applying fuel consumption amount and engine speed, if the coolant temperature is less than a second temperature and determining a final speed of the electric water pump by applying a compensation coefficient according to the coolant temperature, and operating the electric water pump with the final speed to circulate the coolant.

Abstract: An electric water pump control apparatus actively controls an electric water pump in a high speed range or a high load condition as a vehicle accelerates or overtakes. An electric water pump control method may include determining whether an engine is in a high speed/high load condition or in a normal condition by detecting an engine speed, fuel consumption amount, and coolant temperature, determining whether the coolant temperature is less than a predetermined second temperature, if the engine is in a high speed/high load condition, calculating a speed of the electric water pump by applying fuel consumption amount and engine speed, if the coolant temperature is less than a second temperature and determining a final speed of the electric water pump by applying a compensation coefficient according to the coolant temperature, and operating the electric water pump with the final speed to circulate the coolant.