If the problem is not solved in time, the vehicle will run at a limited speed. After the speed limit is reached, the vehicle will not be able to accelerate, which will seriously affect the transportation work. If the problem of speed limit and torque limit occurs during the transportation of green link, there will be more serious losses.
As a common problem of national six truck, speed limit and torsion has always troubled card users. What is speed limit and torsion? Torque limit is also called primary driving performance limit. When the emissions exceed the OBD limit and the problem is not solved within the specified time, the vehicle power output will be limited and the vehicle torque will be reduced by 25%. Speed limit is also known as severe driving performance limit. When the vehicle is limited to torsion and has not been solved, the vehicle's driving speed will be limited. If it is serious, the vehicle will not be able to start.
What are the possible reasons for the speed limit and torsion of guoliu truck?
1. sensor damage
In order to determine whether the exhaust emission meets the standard, multiple sensors such as differential pressure sensor, exhaust temperature sensor, nitrogen and oxygen sensor are required to detect the exhaust in real time. When the exhaust data detected by the sensor is abnormal, the vehicle will limit the speed and torque. Therefore, when the sensor is damaged and the detection data is abnormal, it is easy to cause the generation of speed limit and torque limit.
2. use unqualified fuel
As the national six truck has put forward higher requirements for emissions, we must not be careless when selecting fuel. We need to select fuel that meets the national six standard. In order to save transportation costs, many drivers will take the initiative to choose non-conforming gas stations to add fuel when adding fuel, which will not ensure fuel quality. Unqualified fuel will lead to more particulate matter after combustion, making DPF more blocked and causing speed limit.
In addition to selecting fuel that meets the national VI standard, the selection of fuel filter also needs careful consideration. High quality fuel filter will ensure the purity of fuel entering the combustion chamber and reduce the possibility of DPF blockage.
3. urea fails to meet the standard
Urea can react with the nitrogen oxide in the tail gas to reduce the nitrogen oxide content in the tail gas. Therefore, the national sixth truck ensures that the nitrogen oxide in the tail gas meets the emission standard by adding urea solution that meets the standard.
In order to save costs, many drivers will add urea solution that does not meet the standard, resulting in the formation of urea crystals, resulting in exhaust back pressure, resulting in speed limit and torque limit. In addition, many companies of the sixth division of the State Council have the opportunity to choose inferior urea filters, so that the urea filtration is not up to the standard and crystallization is generated faster. Therefore, it is very important to choose high-quality urea filters.
