What is the purpose of automotive urea?

1 Answers
DeHolden
07/29/25 2:55pm
Automotive urea serves the function of treating exhaust gases to reduce pollutants in the emissions. It is a liquid used in SCR (Selective Catalytic Reduction) technology to decrease nitrogen oxide pollution in diesel vehicle exhaust. Its composition consists of 32.5% high-purity urea and 67.5% deionized water. The operation process of the SCR system is as follows: when nitrogen oxides are detected in the exhaust pipe, the urea tank automatically sprays diesel exhaust fluid (DEF). The DEF and nitrogen oxides undergo a redox reaction in the SCR catalytic converter, producing harmless nitrogen gas and water vapor that are then emitted.
Was this review help?
6
2
Share
More Forum Discussions

Can You Stop During Curve Driving?

Curve driving does not allow stopping. Below are specific details about the Subject 2 driving test: Introduction: Subject 2, also known as the small road test, is part of the motor vehicle driver's license assessment. It refers to the field driving skills test. For the C1 license, the test items include five mandatory components: reversing into a garage, parallel parking, stopping and starting on a slope, right-angle turns, and curve driving (commonly known as S-turns). Some regions also include a sixth item: highway toll card collection. For the C2 license, the test items include four mandatory components: reversing into a garage, parallel parking, right-angle turns, and curve driving (commonly known as S-turns). Teaching Objectives: Master the basic essentials of driving operations and possess the fundamental ability to control the vehicle. Proficiently grasp the basic methods of field and road driving, with the capability to reasonably use vehicle controls and correctly manage the vehicle's spatial position. Accurately control the vehicle's driving position, speed, and route.
16
0
Share

What Should You Pay Attention to When Parking Daily

Daily parking requires attention to parking location and traffic compliance. Below is an introduction to daily parking precautions: Parking Location: Choose a side parking space, as it only faces adjacent vehicles on one side, making it the safest spot to prevent scratches. If you opt for a middle space, the likelihood of accidents significantly increases. Ensure the right side is wide; if there's no choice but a middle space, leave as much room as possible on the right side to facilitate the driver of the adjacent vehicle to open their door. Maintain a safe distance; generally, if the space is large enough, the parking distance should not be too great. The most dangerous distance is one meter, as it allows adjacent vehicles to open doors carelessly, increasing the chance of accidents. Traffic Compliance: Avoid haphazard parking. Parking randomly not only violates regulations but also inconveniences others and may provoke dissatisfaction, leading to potential damage to your vehicle. Whether driving or parking, follow rules and maintain courtesy. It's best to meet your parking needs without inconveniencing others.
17
0
Share

What are the reasons for feeling a lack of power when pressing the car accelerator?

The main reasons for feeling a lack of power when pressing the car accelerator are related to the car's valves, fuel injectors, and pedal sensors. The specific situations are as follows: 1. Valve failure or intake pipe blockage: If the throttle valve fails or the intake pipe is blocked, it will result in insufficient air intake. Throttle valve failure affects the opening and closing degree, while carbon buildup in the intake pipe directly impacts the air intake volume. Reduced air intake affects the combustion efficiency of gasoline, leading to delayed acceleration. 2. Carbon buildup in fuel injectors or fuel line blockage: Carbon buildup in fuel injectors or fuel line blockage affects the fuel intake volume of the cylinders. Carbon buildup in fuel injectors affects the fuel spray volume, while fuel line blockage directly impacts the fuel intake volume or causes insufficient fuel supply. Insufficient fuel intake leads to an imbalance in the air-fuel ratio in the combustion chamber, resulting in incomplete combustion. 3. Pedal sensor failure: If the pedal sensor fails, the signal transmission when pressing the accelerator will be abnormal. This is also one of the reasons why there is a delayed response after pressing the accelerator.
11
5
Share

What are the new regulations for renewing a C1 driver's license?

Driver's licenses can be renewed up to 3 months in advance. Within ninety days before the expiration of the motor vehicle driver's license, apply for renewal at the vehicle management office where the license was originally issued. When applying, you must fill out the "Motor Vehicle Driver's License Application Form". Documents required for renewal: Bring two copies of your ID card, two recent 1-inch color photos without a hat, original ID card, original driver's license, and a medical examination certificate from a county-level or above hospital (you can also get a free medical examination at the vehicle management office). Renewal process: The motor vehicle driver should bring the required documents to the vehicle management office where the license was originally issued to apply for renewal. The vehicle management office will process the renewal within one working day after approval. Regulations on the expiration of driver's licenses: If the license has expired for less than one year, it can be renewed normally; if it has expired for more than one year but less than three years, the license will be canceled, but you can renew it by passing the subject one test; if it has expired for more than three years, the license will be invalid and cannot be renewed.
15
2
Share

What is the 0-100 km/h acceleration time of the ES200?

The Lexus ES200's 0-100 km/h acceleration time is 10.9 seconds. It is equipped with a 2.0-liter naturally aspirated engine. The ES is a mid-to-large luxury sedan under the Lexus brand, and this model comes with two engine options, the other being a 2.5-liter naturally aspirated engine. The 2.0-liter naturally aspirated engine in the ES200 delivers 173 horsepower and a maximum torque of 208 Nm. This engine can output its maximum torque starting from 4,400 rpm, which is sustained up to 5,200 rpm. The engine reaches its maximum power output at 6,600 rpm. It features hybrid injection technology and uses an aluminum alloy cylinder head and block. This engine is paired with a CVT transmission. The 2.5-liter naturally aspirated engine produces 207 horsepower and a maximum torque of 243 Nm. The maximum torque range for this engine is between 4,000 and 5,000 rpm, while the maximum power is achieved at 6,600 rpm. This engine also utilizes hybrid injection technology and an aluminum alloy cylinder head and block. It is matched with an 8-speed automatic transmission (8AT).
8
5
Share

When is the best time to turn on ECO mode?

In urban congested traffic conditions, turning on ECO mode works best. In such scenarios, strong power output is not required, and the frequent stop-and-go driving leads to higher fuel consumption. Activating ECO mode not only reduces fuel consumption but also enhances driving comfort. There are a few situations where ECO mode is unnecessary: When driving at high speeds (up to 100km/h), even if ECO is turned on, the vehicle's computer will prioritize speed, causing the ECO mode to automatically deactivate. When high torque output is needed, such as when climbing hills, the engine control unit will prioritize ensuring sufficient power to drive the vehicle, and the ECO mode will automatically deactivate. Modes: Generally, ECO driving modes can be divided into two types: passive ECO driving mode and active ECO driving mode. The passive ECO driving mode primarily serves as a reminder and guidance function. The active ECO driving mode usually has a dedicated button; once activated, a series of driving-related settings will change. For example, the throttle opening corresponding to the same accelerator pedal depth becomes smaller (making the pedal less responsive), the transmission shift logic prioritizes fuel economy (shifting up earlier), and some vehicles may also adjust the air conditioning output power accordingly.
13
1
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.