On May 16th, Dongfeng Honda issued a statement that it will start recalling CR-V (1.5T) models with hidden engine oil level increase risks from May 22 onwards. When this happened, it declared that the “accelerator throttle” incident had already occurred. Ending.
The deer learned from a Dongfeng Honda 4S shop in Guangzhou that almost the same time as the statement was issued, the 4S shop pushed the CR-V car to the showroom and ended the suspension of sales measures since March 1.
The sales staff also explained that after the CR-V resumed sales, there were many consumers who had come to view the car, and some of them were still scheduled on May 16. During the CR-V suspension period, many online CR-V's remarks also came to an abrupt end. It can be said that CR-V can be regarded as 'full blood resurrection'.
The oil level increase has finally been resolved
Since the beginning of last winter, some Dongfeng Honda CR-V models equipped with a 1.5T Earth Dream engine have increased engine oil level, causing owners to worry about engine life. According to recall measures, Dongfeng Honda Motor Co., Ltd. will be recalled. The range of vehicles is free to replace the air conditioning control unit, upgrade the FI-ECU software, replace the radiator water pipe assembly at the same time on the model equipped with the CVT gearbox, upgrade the TCU software, suppress the increase of the oil level, and eliminate potential safety hazards.
And when the recall is implemented, the engine in the recall scope will be replaced with free engine oil and oil filter, and engine cleaner will be added.
With the introduction of this recall measure, many owners have expressed their suspicions that the big stone has been laid down. When the CR-V model was in a short period of suspension, there were some gossip messages that Honda turned a deaf ear to the question, and even more said that Honda wanted to The abandonment of the CR-V model caused a greater impact on the owner.
In fact, the problem of increasing the level of engine oil is complicated. It takes time for engineers to obtain a final solution. Before the recall, Dongfeng Honda implemented a temporary solution: When the vehicle oil level increased Or after exceeding the upper limit of 30mm, it is possible to change the oil and oil filter at the 4S shop free of charge, thereby eliminating consumer concerns about engine damage.
Among the various measures for recalling, which included upgrading the ECU software, in fact, at the beginning of the incident, the deer had already guessed that this was the main solution to the problem of increasing the engine oil level. By changing the fuel With the injection method and timing, it is possible to avoid fuel dilution when starting the engine at low temperatures.
In addition, the replacement of the air conditioning control unit and the replacement of the radiator water pipe assembly and the upgrade of the TCU software for the vehicle equipped with the CVT gearbox are also believed to be a means to facilitate the rapid entry of the engine into the warming-up condition at low temperatures.
On the other hand, some media conducted tests before and after upgrading the ECUs of vehicles with other brands whose engine oil level has also increased. Test results show that after the ECUs are upgraded, the increased height of the engine oil level is significantly improved, and the engine power is not sacrificed. Performance. Testing the oil used by the engine before and after the upgrade of the ECU also shows that upgrading the ECU is an effective way to solve the problem.
After testing the gasoline content of the oil before and after the upgrade of the ECU, 4.93% of the samples were not upgraded, 3.34% of the samples after upgrading, and 1.59% of gasoline after upgrading. The ECU upgrade program achieved significant results. (Test data from the car home)
Increased oil level due to inherent engine characteristics
Why can the oil level rise be solved by upgrading the ECU? The engine oil level rises, the key word is fuel dilution and low temperature. Fuel dilution means that part of the fuel that has not been able to participate in the combustion flowed into the bottom along the cylinder wall. Shell, which causes the engine oil to be diluted with fuel.
The phenomenon of engine fuel dilution at low temperature is the 'culprit' that causes the rise of the oil level.
The fuel dilution phenomenon has long been known to engine engineers. As long as it is an internal combustion engine, there will be fuel dilution. Because the engine's combustion chamber is not a completely enclosed space, when the engine is operating, the high-temperature and high-pressure gas in the combustion chamber will be burned away. The material and some fuel that is not completely burned follow the gap in the piston ring and enter the crankcase, contaminating the engine oil.
The engine operating temperature is high, in order to ensure that the piston ring heat expansion space, in the case of cold, the piston ring is not completely sealed, resulting in fuel dilution.
Due to the gap between the piston and the cylinder wall, fuel dilution is a phenomenon that exists in all engines.
It is worth noting that the fuel dilution phenomenon occurs in both manifold injection engines and direct injection engines. However, the direct fuel injection engine fuel dilution at extremely low temperatures may be more serious. The reason is that direct injection engine fuel is direct It is injected into the cylinder, unlike the manifold injection, which has more time to mix with the air.
Therefore, in the extremely low-temperature environment with large injection quantity and under heavy load conditions, the phenomenon that gasoline is sprayed onto the cylinder wall may occur, which intensifies the degree of fuel dilution.
Under the specific use environment, the wet wall phenomenon caused by the direct injection in the fuel tank aggravated the progress of the fuel dilution phenomenon.
In this regard, the engine engineer has an effective response plan. It is the crankcase forced ventilation system with the PCV valve as the main component. The inflow crankcase fuel and the products of fuel combustion are reintroduced into the intake pipe, and then enter the cylinder again. Burning is its main role.
However, this method does not discharge 100% of the pollutants, so the oil of our car will turn black and have a small amount of fuel odor after a period of use, and often comes from this. When the false oil overflowed earlier, Whether or not the engine oil smells of fuel to determine if it is a false engine oil is due to fuel dilution.
The crankcase forced ventilation system is a system designed by the engine engineer to solve the problem of fuel dilution.
Some media have actually measured the increase in oil, and found that different brands use models of turbocharged direct-injection engines. They repeatedly travel short distances under low-temperature conditions to simulate the daily commuting work status. All models have appeared. With the phenomenon of increased oil, it takes only a long distance to drive and the oil level drops back. This shows that the increase in oil level is related to the use of cars and is a common phenomenon. The brand does not play an absolute role. effect.
Some media reported that the oil surface level of the small-displacement turbocharged direct-injection engine was increasing after repeated measurements were performed in the high-cold area.
It can be seen that by upgrading the ECU to modify the fuel injection timing and pulse width at a low temperature (not reaching the normal operating temperature), making it difficult for fuel to be injected into the cylinder wall and speeding up the warm-up speed, the problem can be fundamentally solved. Obviously, Honda This is also the case.
By upgrading the ECU, the timing of fuel injection and the pulse width of the fuel injection can be controlled to reduce the occurrence of the wet wall phenomenon. It is also possible to adjust the warm-up conditions to shorten the warm-up time and allow the engine to quickly enter normal operating conditions.
Don't be afraid, lifelong repairs for the main engine parts
Even so, for the owners, the fuel dilution than most worried about the degeneration of engine lubricating oil, so make performance degradation, affecting the life of the engine. In fact, fuel dilution is not so terrible, after all, already open in the automotive industry in the formulation of the lubricating oil, there is a lot lower fuel dilution effects of the additives, particularly long-acting oil, but also introduced in recent years to achieve the rating ILSAC GF-5 engine oil, and better meet the diverse needs of the engine.
So, as recommended by the manual cycle replacement for oil, engine timely maintenance, large vehicles can be assured.
ILSAC rated GF-5 oil, its performance in all aspects is superior to the previous oil.
In order to eliminate vehicle owners' concerns, Dongfeng Honda also provides life-long repair services for the main engine parts of vehicles within the scope of recall. In addition, if the engine oil level increases to a certain degree during the normal use of the vehicle, an engine failure indicator will appear. After lighting, the engine crankshaft is damaged, the oil pump is damaged, the piston cylinder liner is damaged, the camshaft is damaged, etc. The Dongfeng Honda will replace the engine assembly for free. I believe that under this measure, all vehicle owners do not need to worry anymore.
On the other hand, the status quo of the majority of domestic vehicle owners (short-term driving within 10km for a long period of time, slow road traffic jams) is actually the most detrimental to the engine. Under these operating conditions, the engine systems cannot be normal. In the state of operation, if there is a serious fuel dilution phenomenon, the crankcase forced ventilation system cannot discharge the fuel oil and other components out of the crankcase in a timely and effective manner. This is not specific to a particular engine.
The domestic traffic conditions make the car engine work under harsh working conditions for a long time. Check it more frequently.
Running the engine for long-distance often is actually a good thing. If you do not find opportunities for long distances, you can try to create normal working conditions for the engine while driving, do not deliberately kept in a state of low-grade driving, high speed let the engine is in a better working condition. Finally, by using the manual requires timely maintenance, this is the best car of the road.
