hello everyone. I am writing you from turkey. I have a 2020 model corolla hybrid car. It is produced in Turkey. 4th generation hybrid. P610 with transaxle. It has an 1800 cc 2zr-fxe engine. I wonder something. Is the engine oil pump electric? Partsouq photo:
No, the oil pump is mechanically driven. It has a small chain from the crankshaft to sprocket on the pump. Posted via the PriusChat mobile app.
I would have preferred the oil pump to be electric. Istanbul's traffic is very busy. All roads are red on google maps. but my fuel consumption is 4.5 lt/100km. other petrol cars at least 10 lt/100km. diesel cars fuel consumption 7-8 lt/100km
an electrically-driven pump would be less efficient: converting the mechanical, rotational energy of the engine crankshaft into electricity, then converting that electricity BACK into the mechanical rotation of a pump would involve more losses than mechanically linking the pump to the crankshaft.
Toyota has it figured out. To make the Corolla hybrid they used the same technology from the Prius. For the most part the Prius has been very reliable.
In older engine designs with conventional oil, frequent start stop would be an issue. Better tolerances in Toyota hybrids and especially synthetic oil helps. Toyota made their water pumps electric as a method to combat thermal cycling which is a bigger issue. They also went to special cylinder insulators on gen4 for the same reasons.
An electric oil pump would have to have a fairly large motor to supply maximum pressure and volume at high engine RPM. That increases cost and puts more load on the 12V electric system. There must not be enough gain vs cost to using electric oil pump - I have never heard of any car with this. Posted via the PriusChat mobile app.
