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Electric coolant pump is a kind of automotive electric water pump that driven by a 12v, 24v or 48v brushless dc motor. Usually powered by battery and used as a battery powered water pump in new energy buses, and new energy vehicles etc. It is small in size, high in efficiency, usually used for automobile's engine cooling, new energy bus,new energy vehicles battery circulation cooling, etc. It pressurizes the coolant to ensure the coolant circulates in the cooling system. A popular view is that : it pumping the coolant continuously circulate in the radiator engine block. And take away the heat to ensure that avoids high temperature to damage the engine .
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Nowadays, with the hot sales of turbocharged engines, the cooling system has become another major problem faced by major automotive manufacturers. Due to the turbocharger runs too fast, up to 200,000 rpm max speed, plus the exhaust gas temperature. It will cause the turbine temperature to reach about 1000 °C. The oil and coolant will stop flowing, and the high temperature of the turbine cannot be effectively cooled. Once the driver turn off the engine and the engine stops. Over time, it is easy to accelerate the aging of the turbine. And the oil in the bearing shell will overheat, forming coking, resulting in excessive oil consumption. In order to solve this drawback,extend the engine life ,as a high efficiency brushless dc pump the engine electric coolant pump come out.
The main function of the 12v coolant pump is that: As a circulation water pump, the 12v engine coolant pump will keep working to continue the circulation of the coolant to fully dissipate heat for the turbocharger, after the engine stopping work. Its working principle is: It is controlled by the engine control unit, the electric coolant pump helps the engine turbocharger to cool under certain operating conditions; The electric water pump discharges the heat away from the turbocharger, after the driver turn off the engine.
That is to say, during the driving process, the engine control unit ECU will automatically adjust according to different working conditions. So as to avoid excessive heat generated by the turbocharger to damage the turbocharger. The electric coolant pump will continue to work automatically for a while. After the driver turn off the engine directly from driving at a high speed for a long time. This can eliminate the faults of the turbocharger due to overheating. In addition, it will stop working according to the situation and achieve the purpose of energy saving. If the control unit detects that the engine is not under heavy load conditions.
To put it simply, the automobile mainly relies on the small electric water pump to circulate the water to cool the system, when it is running. However, the main water pump will stop working, after the vehicle stopped. If there is a problem with the auxiliary electric coolant pump, the turbocharger will not be cooled. It will lead to the reducing in the life of the turbocharger. In addition, the water vapor in the auxiliary coolant pump may cause a short circuit in its control circuit. This will cause too high temperature of the engine coolant pump and erode the related parts. In severe cases, the engine compartment may be ignited or spontaneously ignited, exist a certain security risk.
Since the frequent use of automotive coolant pump, it is unable to avoid that they will not fail during operation. Therefore, people should master the diagnosis and maintenance methods of common failures of the pump, eliminate the failures in time to avoid damage to the car engine. So, how to judge the electric coolant pump is damaged? People can judge it from the following aspects:
In general, the engine-assisted electric coolant pump can effectively reduce the temperature after the turbocharged engine is stopped. It is a good protection for the engine. Suggest deal with it in time to avoid bigger problems, when you find a problem with the vehicle cooling system.
As we know, if coolant contains solid particles and its size are too large. In addition to extremely high-speed impact on the impeller and destroying the original anti-corrosion protective layer, it will use the heat that released when the bubbles condense to chemically corrode the impeller’s surface material. And the development of corrosion is extremely rapid, which greatly accelerates the destruction speed of the impeller material of the automotive electric coolant pump. Even in the case of weak cavitation, cavitation plus corrosion stress will seriously damage the blade material. Severely, the large size solid particles will cause the electric coolant pump impeller stuck and burn the coolant pump motor. Therefore, we must choose a qualified coolant for the electric coolant pump. People can choose a qualified coolant follow the below points: