What is the principle of engine exhaust braking?

1 Answers
VanKendra
07/30/25 7:37am
The principle of engine exhaust braking: Utilizing the vehicle's own kinetic energy to compress air during the intake stroke, an additional mechanism opens the exhaust valve when the piston reaches the top dead center, expelling the compressed high-temperature and high-pressure gas from the cylinder. This prevents the compressed air from performing work on the piston during the next power stroke. Exhaust braking is widely used in large diesel vehicles. A regulating valve is installed on the engine exhaust pipe, and closing this valve increases the pressure during the exhaust stroke, generating braking force through the resulting negative pressure. The regulating valve is typically driven by a control mechanism and often shares the same power source as the main brake system.
Was this review help?
11
5
Share
More Forum Discussions

How to Fold the Rearview Mirror of Q5?

To fold the rearview mirror of Q5, locate the mirror adjustment button on the driver's side door handle. Rotate the topmost button to adjust the mirror angle and fold the mirror. The rearview mirror serves three main purposes: 1. For driver convenience: To prevent traffic accidents and ensure personal safety, all vehicles must be equipped with rearview mirrors, and all mirrors must be adjustable. 2. To observe vehicles behind: The rearview mirror's effectiveness depends on the driver's eye distance from the mirror, the mirror's size, and its curvature radius. 3. The lower mirror allows the driver to see areas beyond the front and rear wheels: This helps the driver check for people or obstacles near the wheels and the vehicle's sides when reversing or starting, preventing injuries, damage to objects, or vehicle harm.
15
2
Share

What Does the L in Engine Stand For?

Here is what the L in engine represents: 1. The L-type engine, also known as the "Inline" (Line Engine) engine, refers to an engine where the cylinders are arranged in a straight line, with all cylinders aligned side by side at the same angle in a single plane. 2. "Inline" is generally represented by the letter L, followed by the number of cylinders to form the engine code. Currently, the main types of engines used in automobiles are L3, L4, L5, and L6 engines. Additional information: The inline 4-cylinder engine is commonly used in engines with a displacement of 2.2 liters or less. As for the inline 6-cylinder engine, the current standout is the renowned BMW. BMW's inline 6-cylinder engine embodies the pinnacle of technology in mass-produced engines today, making it the ultimate achievement in inline 6-cylinder engines.
18
1
Share

Is there a Haval H5 that meets China 6 emission standards?

Haval H5 does not have a China 6 version model, and the currently available models comply with China 4 and China 5 emission standards. Below is relevant information: 1. China 6 refers to the National Sixth Stage Emission Standards for Motor Vehicle Pollutants. Under current circumstances, China 6 emissions are divided into China 6A and China 6B stages. Compared to China 5 emission standards, China 6 emission standards have more stringent requirements and impose stricter limits on pollutant emissions. 2. Emission standards refer to vehicles that comply with the national regulations for different stages of motor vehicle pollutant emission standards. The higher the number, the later the standard was issued, and the more stringent the energy-saving and emission reduction requirements for vehicles. The China 6 emission standard is an upgraded version of the China 5 emission standard, imposing more stringent limits on emissions of CO (carbon monoxide), THC (total hydrocarbons), NMHC (non-methane hydrocarbons), NOX (nitrogen oxides), PM (particulate matter mass), and introducing regulations on PN (particulate matter number) emissions compared to the China 5 standard.
17
4
Share

Which country's brand is Toyota?

Toyota is a Japanese brand, renowned worldwide for its quality. The brand name is Toyota Motor Corporation, known as TOYOTA in English. Toyota's sales have topped the charts multiple times. Its main models include: Prado, Land Cruiser, Corolla, Vios, Corona, Prius, Highlander, Camry, and more. The three-ellipse logo of Toyota has been in use since the early 1990s. The large ellipse in the logo represents the Earth, with two smaller ellipses forming a 'T' in the center, symbolizing Toyota. It signifies Toyota's commitment to the future, its confidence and ambition, as well as its dedication to customers, ensuring a bond of trust between the company and its users. It also represents Toyota's advanced technology and innovative potential. Key milestones in Toyota's development include: 1867: Birth of Sakichi Toyoda. 1936: Launch of the Toyota AA sedan. 1947: Successful prototype of the first compact car in January. 1984: NUMMI, a joint venture with General Motors, begins production in the U.S. 1999: Listed on the New York and London stock exchanges. 2004: Establishment of Guangzhou Toyota Motor Co., Ltd. in China. February 28, 2008: FAW Toyota officially launched the new VIOS in Zhuhai. June 26, 2008: GAC Toyota Yaris launched in China. 2021: Toyota Motor Corporation won the sales championship in the U.S. automotive market.
19
1
Share

What SUV models does Skoda offer?

Currently available Skoda SUV models include the Kodiaq, Karoq, Kodiaq GT, and Kamiq. These are all the latest SUV models on the market. The Kodiaq is positioned as a midsize SUV, with body dimensions of 4698mm, 1883mm, and 1676mm, a wheelbase of 2791mm, and equipped with Continental tires in the size of 235/50R19. The Kodiaq GT is positioned as a midsize SUV, with body dimensions of 4634mm, 1883mm, and 1649mm, and a wheelbase of 2791mm. The Kamiq is positioned as a small SUV, with body dimensions reaching the level of an entry-level compact SUV. The entire lineup offers two powertrain options: a 1.5L naturally aspirated engine and a 1.2L turbocharged engine. The Karoq is positioned as a compact SUV, offering three powertrain options: 1.4T, 1.6L, and 1.8T turbocharged engines. The Karoq comes standard with a panoramic sunroof across the entire lineup, with the front portion being openable.
13
0
Share

How Does a Continuously Variable Transmission Work?

The following is the working principle of a continuously variable transmission: 1. The power output from the engine's output shaft is first transmitted to the driving pulley of the CVT, then to the driven pulley via a V-shaped belt, and finally to the wheels through the reducer and differential to drive the car; 2. During operation, the movable discs of the driving and driven pulleys move axially to change the working radius where the conical surfaces of the driving and driven pulleys engage with the V-shaped belt. The axial movement of the movable discs is controlled by the driver through the system, which adjusts the pressure in the hydraulic pump cylinders of the driving and driven pulleys as needed; 3. Since the working radii of the driving and driven pulleys can be continuously adjusted, this enables continuous variable transmission.
4
2
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.