On January 1, 2021, the transition period of China VI particulate matter quantity (PN limit) ended, including pickup trucks, and light trucks fully implemented the true National VI emission standards. After a year, China VI products have been fully deployed in the domestic pickup truck market, and the industry even began to send news of China VII from time to time, and emission upgrades have become a general trend.
However, in the more than a year after the implementation of China VI, the owners of China VI pickup trucks encountered the problem of multiple use of vehicles. In the survey of the owner's reputation before the China pickup truck network, it was found that after the full implementation of China VI, the failure rate of DPF and urea-related has become significantly higher, and frequent self-cleaning and urea failures have become a headache for many Car Owners of China VI, and have also become a common problem of China VI pickups.
Pickup truck owner survey part of the feedback extracted
What is the DPF's frequent self-cleaning?
"The self-cleaning of the vehicle is too frequent, once the self-cleaning begins, special attention should be paid to not being able to stop when driving, and occasionally the torque of the engine will be limited, which is really fuel-intensive and troublesome." Mr. Liu, a pickup truck owner from Panzhihua, Sichuan, complained during the investigation. In this pickup truck owner word-of-mouth survey, the problem of DPF self-cleaning has been repeatedly mentioned, and after the diesel pickup truck is upgraded to National VI, the relevant system of exhaust gas treatment has become the "hardest hit area" of the problem.
DPF is the diesel particulate filter, China VI has very strict requirements for PM particles, therefore, the treatment of PM particles has become a very important part of the diesel engine exhaust system, diesel pickup exhaust system DPF device is to capture the role of this PM particles.
In layman's terms, we can understand the DPF device as a "mask", when the PM particles are more and more concentrated, and reach a certain value, it will lead to poor exhaust, and even lead to adverse effects such as engine power performance and economic performance decline. Therefore, this "mask" should be cleaned up from time to time and the PM particles should be disposed of, which is the regeneration process of DPF.
So, under what standards or under what circumstances will DPF initiate self-cleaning in existing pickup products? China pickup truck network asked the relevant technical experts of pickup truck companies, he said that when the carbon load reaches a certain level, and the water temperature, exhaust temperature, etc. meet the set requirements, DPF will enter the regeneration, "the standard of carbon load, each vehicle is not the same, need to be determined according to the DPF hardware." ”
In response to the problem of frequent self-cleaning of DPF, the technical expert said: "Poor operating conditions will affect the regeneration temperature, which in turn will affect the regeneration efficiency, resulting in frequent regeneration, and poor carbon emissions of the original machine will also lead to frequent regeneration." "In addition, poor quality oil products, long-term low-speed driving, etc., will lead to an increase in fine particles in the exhaust, resulting in DPF frequently starting the self-cleaning system, and even blocked."
In order to avoid frequent regeneration of DPF, the technical expert suggests that when the instrument prompts the need to clean DPF, card friends should strictly follow the vehicle manual, "The national six pickup truck to reduce the self-cleaning frequency mainly refers to reducing the self-cleaning frequency of DPF, some technical routes also need to reduce the self-cleaning frequency of NSC, in order to reduce the occurrence of self-cleaning frequency, card friends must go to the regular gas station to add regular national six oil, when the vehicle instrument shows that it is cleaning DPF or NSC, pay attention not to force the flameout." ”
At the same time, we also found relevant information in the manual of some pickup trucks, "avoid the engine for a long time or frequent low speed large throttle operation", "avoid the engine for a long time or frequent idle running", "avoid frequent parking or shutting off the engine", "avoid frequent short-distance driving" and other driving behaviors, can reduce the frequent regeneration of DPF.
When will the urea failure stop?
The implementation of the National VI emission standard has made a new term in the pickup truck industry - urea. As early as the implementation of the mainland China IV emission standards, vehicle urea is widely used in heavy diesel trucks, after the implementation of China VI, including pickup trucks, light diesel vehicles began to be unable to rely on the optimization of the engine itself to meet emission requirements, at this time, urea has become the standard of the National VI diesel pickup truck, accompanied by "urea alarm", "urea pump failure" and other issues.
"The urea table is like a fool, obviously there is no more, and it shows enough!" Mr. Pickup Truck Advocate of Lanzhou, Gansu Province, said. Contrary to his situation, Mr. Peng, the owner of the Tongliao car in Inner Mongolia, wondered why the urea of his pickup truck had been filled, but it still showed that "the urea addition failure will not be able to start after 500km", and many car owners said that the urea showed as if it was metaphysical and very random.
In this regard, the relevant personnel of the pickup truck enterprise told the China pickup truck network that if there is a urea problem, the first thing to ensure is to use the original urea. "Urea can not use agricultural urea to blend, diesel vehicles use urea in purity is much higher than agricultural urea, and vehicle urea is generally composed of 32.5% urea and 67.5% water, in the absence of equipment can not guarantee whether the ratio is correct."
He stressed that the urea or inferior urea he mixed would cause the crystallization of the exhaust pipe aftertreatment part, or damage the urea pump, urea nozzle and all related accessories, which would bring more trouble, and the maintenance costs incurred after the problem were more than worth the loss.
In addition, a pickup truck dealer in Heilongjiang told us that urea nozzle damage, urea freezing, leakage points in the urea system, etc. may cause the urea failure mentioned above, and the specific problems need to be analyzed specifically, and it is recommended that the card friends who have problems go to the service station for real vehicle testing.
"Pickup truck's urea box through ultrasonic detection of liquid level data transmitted to the ecu, or more accurate, card friends usually pay attention to the filling of qualified urea, do not overfill, in the cold winter as far as possible to park the car in the indoor garage, which can reduce the failure of the urea system." A technician from a pickup truck company told us.
summary:
After the implementation of China VI, domestic pickup trucks, especially diesel pickup trucks, have undergone major changes in the technical route, which has put forward higher requirements for the entire industry. For car companies, in addition to launching products that meet the emissions of China VI, continuously optimizing technical routes and ensuring the quality of after-sales service are also the tests proposed by the National VI era.
As mentioned in this article, the frequent self-cleaning of DPF, urea failure and other issues may be related to the driving habits of card friends, but the emergence of common problems also means that the existing technical route is still insufficient. With the transformation of domestic pickup trucks and the gradual diversification of users' demand for pickup trucks, the new generation of pickup trucks is facing higher and higher requirements in terms of function, technology and configuration, and the overall quality of pickup truck products needs to be further improved while positioning and upgrading.