* * * Gender, time and place all happened around the Spring Festival, all in high latitudes. Before and after the Spring Festival, there is still no spring in Northeast China, and the cold air in Siberia still affects the temperature in Northeast China. The increase of air humidity virtually provides the necessary conditions for the increase of water vapor and low temperature required by engine oil. Secondly, the Northeast took the lead in promoting the use of ethanol gasoline. Compared with pure gasoline, ethanol gasoline will have more water content, more steam after combustion, and of course it will burn cleaner. This will inevitably lead to high water vapor content in crankcase blowby, which will further aggravate the increase of engine oil. However, what is mentioned here is only a very small increase. As long as the engine can run at normal oil temperature for a long time, this increased part will be discharged with the crankcase ventilation system. This is not a patent of Toyota. All engines will have this phenomenon, and a very small increase will not affect the performance of the engine.
The difference is the technical difference between the two. Honda's 1.5T Earth Dream Engine is also the world's advanced engine power technology. It adopts turbocharged engine, direct injection in cylinder and Atkinson cycle. Through in-cylinder direct injection, Atkinson cycle and turbocharging, the thermal efficiency and fuel economy of the engine are improved.
The main reasons for the increase of engine oil are in-cylinder direct injection technology and higher cylinder pressure. When the engine is in a low temperature and low load cold start state, the rich mixture provided by the nozzle and intake valve according to the cold start logic will not be very good. Even at low temperature, atomized fuel will condense into liquid fuel and hang on the cylinder wall. This is the source of liquid fuel entering the crankcase at low temperature.
The application of turbocharging technology also brings higher cylinder pressure, which intensifies the recondensation of atomized fuel to some extent. Therefore, the increase of Honda's 1.5T Earth Dream engine oil has a certain relationship with the characteristics of the direct injection engine. Similarly, Volkswagen's turbocharging and direct injection power will have similar problems, which is a normal state that the structure must correspond to.
In Honda's recall plan, it is also clear to adjust ECU to speed up the engine warm-up time to ensure that the engine can enter the warm-up state faster under the short-distance cold working condition of UHF.
Toyota's hybrid power system is proud, and the matching internal combustion engine power is Atkinson cycle naturally aspirated engine and dual injection system. From the engine working principle, the increasing trend of engine oil is not as obvious as Honda's direct injection engine.
There is also a unique technical response to the "wet wall phenomenon". Toyota's dual injection system is to solve the shortcomings of direct injection technology in cold state. When the engine is cold, low load and low temperature, Toyota's dual injection system will use intake manifold injection to provide rich mixture for the engine, while the direct injection system will only work when the vehicle is under high load.
Write at the end:
The problem of increasing engine oil is not all about CR-V, but the two engines are fundamentally different in technology, so Toyota hybrid owners don't have to be too nervous. The increase of engine oil in Toyota hybrid power system is simply caused by the engine working condition being placed in ultra-high frequency cold working condition for a long time. In fact, it is not difficult to solve this problem, just drive two laps at high speed, and a small amount of oil increase will not cause substantial problems.
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.