To ensure that four of the country's emissions from the OBD channel must be cut off

OBD importance lies in its monitoring effect, tampering with OBD through close OBD knob, or pulled out of the corresponding line interface to shut down the function of real-time monitoring, the system will can not achieve the purpose of monitoring, lose monitoring system without adding urea, or through water injection method can be implemented to run in the process of four heavy truck, and will not affect the engine power, but the discharge of pollutants will increase significantly, even even national emission standards for two are inferior.

Users in order to save the cost of urea and take this improper operation, but also lost the country four emission standards to reduce the important significance of environmental pollution. It is reported that some of the large number of purchase of four imported truck logistics enterprises, in the early days of purchase, due to the import truck dealer recommended that it must be equipped with urea, to discharge standards, does not affect the engine performance. But the higher the price of imported urea, some logistics companies simply take the method of tampering with the OBD, the province directly to save the extra cost to reduce transportation costs. In addition to logistics enterprises, in other truck users, this phenomenon also exists.

According to Song Jian, director of the Institute of automotive technology, Tsinghua University, now the market is used in the country, there is a part of the OBD, does not fill the urea, and some truck dealers will also help customers tampering with OBD to achieve the purpose of sales.

In order to ensure that the country's four truck can really achieve the country's four emission standards, OBD monitoring role is indispensable, so some technical experts and industry insiders call for the production of OBD must be from the production source to ensure that the country's four emissions.

OBD tampering is a design flaw

At present, although our country requires the country four truck must be equipped with OBD, but it is easy to tamper with OBD. Song Jian believes that in fact in the OBD to control the link, the production of enterprises can play a great role. For example, you can cancel the OBD switch knob, so that users can not choose to close, but also can not be tampered with. According to the relevant staff of Cummins (China) Investment Co., Ltd., in Europe OBD system is not allowed to install knob switch, knob switch belongs to the component failure, namely the design is cause one of the reason of excessive discharge. In our country, most of the country's four trucks did not cancel the OBD knob switch, but this switch is mostly designed in the more subtle position, although not directly found in the outside, but the technology is not difficult to operate through the closure.

In addition, China's OBD online detection is not strict enough, but also the cause of the failure of monitoring part. Cummings, the staff said, because the detection is not in place, some of our engine design OBD in the factory monitoring function is not fully enabled, resulting in OBD monitoring is weak, the user only need to pull part of the plug connection can be tampered with OBD, so that its failure.

Zhejiang silver wheel machinery Limited by Share Ltd in charge of postprocessing technology, deputy chief engineer Lu Guodong said, at present, China's OBD online testing is still relatively difficult. Due to the lack of compact and high precision detection equipment, engine manufacturers OBD detection is still a large detection device with fixed. Lu Guodong said that foreign countries in the OBD testing has been used in new equipment, but the domestic use of very few, from abroad to buy high prices.

Engine products in the factory to meet the qualification of the testing agency for emissions certification, but also for OBD testing, but because of the certification of testing organizations are less, the engine manufacturers are mostly designed to meet the certification project, but also the cause of the weak OBD monitoring ability.

Tampering with OBD is not the norm

"At this stage is the use of the country's four trucks will not open OBD." Lu Guodong told reporters. Now from the National IV emission standards of the overall implementation of the deadline less than a month, by the year 2015, the country four trucks will be fully into the market. So, the phenomenon of tampering with the OBD will be a lot of existence?

According to the liberation of the sale of commercial vehicle of Jinan silver month Car Sales Co., Ltd. Sales Manager Li Yongmei, the user in the country of purchase four heavy truck, active request to tamper with OBD is not much, due to the current market urea supply adequate, cost relatively low, so most users have accepted the urea dosing cost increase.

Jin Bo logistics responsible person Shi Xiangyang also said that before the use of imported brands of logistics enterprises to save costs, has been tampered with the phenomenon of OBD, but the current domestic urea prices are cheap, charging into the imported brand truck has not been any problem, so many users start using domestic urea, tampering with OBD behavior has been rare.

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