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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