"God said that saving lives is a victory for the Seventh-level Float. I will not go to hell and go to hell." When Cheng Yong persuaded Mr. Liu to join the drug trafficking team, he said such a resentful sentence, the serious and kindly Liu Pastor finally followed his own heart and joined the leukemia rescue battle. - I am not a drug god After Dongfeng Honda recalled 1.5T CR-V, Dongfeng Honda recalled its 1.5T Civic yesterday, including 1.5T Civic cars from December 15, 2015 to May 17, 2018, for a total of 294,511 vehicles. . The reason for the recall is the same as the 1.5T CR-V. When some vehicles in the recall range continue to drive in a low temperature environment for a short distance, the engine oil level will increase. Dongfeng Honda’s sales exceeded 400,000 units for the first time in 2015, reaching 600,000 units in 2016 and 700,000 units in 2017, achieving a sales triple jump. In the key process of transition from the product era to the brand era, the first half of 2018 can be described as turbulent for Dongfeng Honda. Due to the 1.5T engine throttle event, Dongfeng Honda has implemented CR-V and Civic recalls. On the occasion of the 15th anniversary, the CR-V has been released with a 15th anniversary edition. This series of measures, it is not the self-salvation of Dongfeng Honda like Cheng Yong. Then, next, we will look at the origin of the throttle event and whether this redemption works. Engine oil increase is not unusual Why is engine oil increased? In fact, for automotive engineers, the increase in engine oil is not a rare thing, which can even be said to be a problem that has not been overcome in the entire automotive industry. When the engine cylinder is in the process of work, some unburned mixture will leak into the crankcase (the sump) through the piston ring under high pressure. When the engine is running at low temperature, liquid fuel may leak into the crankcase. This kind of leak is known in the industry as "helium." The crankcase "helium" is an inevitable situation for every engine. No matter what brand of displacement machine, there will be crankcase "helium". These "helium" will cause air pollution if it escapes from the crankcase into the atmosphere. At the same time, these "helium" will dilute the oil in the crankcase, resulting in an increase in oil. This is also called fuel dilution. Car standard PCV system to guide the crankcase "helium" "Helium" has no fundamental solution Since the 1960s, California has required cars to be equipped with PCV (Crankcase Forced Ventilation) systems. The function of PCV is to introduce the "helium" in the crankcase into the intake manifold through the PCV valve, and a small amount of air is directly entered into the intake manifold by the air filter through the PCV valve, and finally enters the combustion chamber to be burned again. It prevents the "helium" from entering the atmosphere and causing pollution, while preventing the oil from being diluted and degraded. Today, PCV has become the standard for every car. Therefore, engine oil increase is a common phenomenon that exists on each engine. At present, automotive engineers can only use the PCV to guide the crankcase to alleviate the problem of increased oil, and can not solve the problem fundamentally. At the same time, it is not difficult to explain why the engine will be equipped with the oil dipstick. The function of the oil dipstick is to monitor whether the engine oil inventory is within a reasonable range. Burning oil phenomenon occurs: engine temperature is too high At this time, some friends may ask questions. Since the increase in oil is inevitable, why is the general public oil reduced? The problem lies in the Volkswagen turbocharger. It has been mentioned that the main function of the PCV is to divert the crankcase “helium gasâ€, and the Volkswagen turbocharger due to the pursuit of high compression ratio causes the engine temperature to be too high, eventually resulting in “除了â€. In addition to the gas, too much oil is vaporized into the combustion chamber through the PCV ventilator. Therefore, the public first experienced "helium" leading to an increase in oil, and then due to excessive temperature caused more oil to evaporate and enter the combustion chamber through the PCV ventilator, the final result is burning oil. The phenomenon of oil increase occurs: the engine temperature is too low Compared with the phenomenon that the temperature of the Volkswagen engine is too high, the engine oil is caused by the PCV. If the engine temperature is not enough, it is not enough to provide the temperature that supports the PCV to completely evaporate the “heliumâ€. This will result in the increase of the oil due to the “heliumâ€. Without the guidance, the oil will be more and more. Therefore, in the case of cold winter, short-distance driving, frequent parking start, intense driving, rapid acceleration, etc., the engine temperature is not available or can not be effectively improved, the phenomenon of increased oil is more likely to occur. In summary, how to properly adjust the engine temperature has become the top priority of controlling the amount of oil. If the engine temperature is too high, the so-called oil burning phenomenon will occur. If the engine temperature is insufficient, the oil will increase. Dongfeng Honda 1.5T engine oil increase phenomenon With these small sciences, let's take a look at the CR-V and Civic engine oils. According to Dongfeng Honda's official explanation: CR-V, Civic 1.5T engine oil level rise is due to the fuel attached to the inner wall of the engine cylinder through the oil ring (the piston ring used to scrape excess oil on the cylinder) into the crankcase, Occurs when mixed with oil. Normally, the fuel that is mixed will volatilize as the engine temperature rises and return to the combustion chamber to burn again. In a low-temperature environment, the vehicle is not heated enough for a short period of time, and the fuel mixed in the oil cannot be completely volatilized, and the oil level may rise. Here we can see that Honda’s official explanation for the increase in CR-V oil is consistent with the engine “窜†principle and the PCV principle we talked about earlier. Dongfeng Honda engine oil increase solution The core of Dongfeng Honda's 1.5T engine oil increase is the low temperature environment and the short-time driving vehicle engine temperature is not enough. Then, how does Dongfeng Honda deal with this problem with the CR-V and Civic 1.5T engine oil increase incidents? From the recall notice of Dongfeng Honda, we can see that Dongfeng Honda started to upgrade the Fi-ECU software, the air conditioning control unit, upgrade the TCU software, and replace the cooling hose assembly with the CVT gearbox. Engine temperature in specific situations. 1, Fi-ECU software upgrade Fi-ECU is a system for controlling fuel injection. By upgrading the Fi-ECU software, the injection time and ignition time of the fuel injection system can be controlled to reduce the fuel injected to the cylinder wall and prevent fuel from entering the cylinder wall through the piston ring. Crankcase; at the same time use higher fuel injection pressure at low temperatures to promote more efficient combustion of the mixed gas. 2, replace the air conditioning control unit In the cold winter, the first thing after starting the vehicle at low temperature is naturally to turn on the air conditioning heating function. The new air conditioning control unit can delay the flow of water to the air conditioning heater bellows, preferentially meet the engine temperature increase, and then meet the heating of the heating bellows. . 3, TCU software upgrade The TCU is a system for controlling the gearbox. By upgrading the TCU software, the engine speed is appropriately increased at low temperatures to make the engine heat engine more efficient. 4, CVT gearbox cooling hose structure change The CVT gearbox is the same as the air conditioner at low temperature start-up. It also needs the engine to provide heat. The water volume of the CVT heater is controlled by the cooling hose configuration change, the engine heat engine is preferentially completed, the engine temperature is raised, and then the CVT heater is turned on. Water, a heat engine that meets CVT. Conclusion Through the introduction of the "Xenon" principle and the PCV principle, everyone has a better understanding of the phenomenon of fuel dilution and burning oil, so there is no need to talk about oil color change. Seeing this, I believe that everyone has already had their own judgments in the depths of the heart, such as "the increase in oil inexplicable" and "there are major defects in the engine." Dongfeng Honda's engine temperature treatment for the 1.5T engine oil event is also in principle. In Xiaobian’s view, “God said that saving lives is a victory for the Seventh-level Float. I don’t go to hell and who goes to hell.†This is what God said or the Buddha said, and whoever he is, as long as he can It is enough to give yourself an account, to give others an account, and to be able to do nothing. wholesale cheap price high quality OEM custom tempered galss / stainless steel frame build in automatic ignition :gas stove,burner gas stove,Gas cooker stove,portable gas stoves,stove Gas Burner,china gas stove gas stove,burner gas stove,gas cooker stove,portable gas stoves,stove gas burner,china gas stove Guangdong Puda Electrical Appliance Co., Ltd. , https://www.elecapokas.com
Dongfeng Honda engine throttle event depth technology analysis of the car industry fuel dilution phenomenon unsolved mystery