language
All categories
06
2022
-
01
20 common types of car engines, how many do you know?
Author:
The engine is known as the heart of a car, and its importance is self-evident, especially for high-end cars. As a car mechanic or car enthusiast, do you know what kind of engine you are repairing? Let's learn together! 1. SOHC: (Single Overhead Camshaft Engine) An engine type classified by the number of camshafts, SOHC refers to a single overhead camshaft engine, suitable for 2-valve engines. 2. DOHC: (Dual Overhead Camshaft Engine) Refers to a dual overhead camshaft engine, suitable for multi-valve engines. Usually, each cylinder of the engine has 2 valves, and in recent years
The engine is known as the heart of a car, and its importance is self-evident, especially for high-end vehicles. As a car mechanic or car enthusiast, do you know what kind of engine you are repairing? Let's learn together!
1. SOHC: (Single Overhead Camshaft Engine)
Engine types classified by the number of camshaft positions. SOHC refers to a single overhead camshaft engine, suitable for 2-valve engines.
2. DOHC: (Dual Overhead Camshaft Engine)
Refers to a dual overhead camshaft engine, suitable for multi-valve engines. Usually, the engine has 2 valves per cylinder. In recent years, 4-valve and 5-valve engines have also appeared, which undoubtedly opens up a way to improve the intake efficiency and power of the engine at high speeds. This type of engine is suitable for high-speed engines and can appropriately reduce fuel consumption at high speeds.
3. Turbo: (Turbocharger)
That is, turbocharging, which is abbreviated as T, generally marked with 1.8T, 2.8T, etc. at the rear of the car. There are single turbocharging and twin turbocharging. The turbocharging we usually refer to is exhaust gas turbocharging, which generally uses the exhaust gas to drive the impeller to drive the pump wheel to send more air into the engine, thereby increasing the engine power and reducing fuel consumption at the same time.
4. VTEC: (Variable Valve Timing and Lift Electronic Control System)
Developed by Honda Motor, VTEC is the world's first valve control system that can simultaneously control both the valve opening and closing time and the lift. It has now evolved into i-VTEC. The biggest difference between the i-VTEC engine and the ordinary engine is that it uses two different valve drive cams at low and high speeds, and can automatically switch through the electronic system. In addition, the engine can automatically change the opening time and lift of the valve according to the driving conditions, that is, change the intake and exhaust volume, so as to achieve the purpose of increasing power and reducing fuel consumption.
5. i-VTEC: (Intelligent Variable Valve Timing and Lift System)
The i-VTEC system is the abbreviation of Honda's intelligent variable valve timing system. The latest Honda car engines are generally equipped with the i-VTEC system. Honda's i-VTEC system can continuously adjust the valve timing and can also adjust the valve lift. Its working principle is: when the engine switches from low speed to high speed, the electronic computer automatically directs the oil pressure to the small turbine in the intake camshaft drive gear. In this way, under the action of pressure, the small turbine rotates a certain angle relative to the gear housing, thereby causing the camshaft to rotate forward or backward within 60 degrees, thereby changing the time when the intake valve opens, achieving the purpose of continuously adjusting the valve timing.
6. CVVT: (Continuously Variable Valve Timing System)
The Korean auto industry has not been known for its advanced technology, so the technologies used are mostly based on the experience of Germany and Japan. CVVT is developed based on VVT-i and i-VTEC. Taking Hyundai's CVVT engine as an example, it can control the opening and closing of the valve at any time according to the actual working conditions of the engine, making the fuel combustion more complete, thereby achieving the purpose of improving power and reducing fuel consumption. However, CVVT does not control the valve lift, which means that this engine only changes the intake and exhaust time.
7. VVT: (Continuously Variable Valve Timing Engine)
This system adjusts the phase of the engine camshaft through the equipped control and execution system, so that the time when the valve opens and closes changes with the change of the engine speed, so as to improve the charging efficiency and increase the engine power.
8. VVT-i: (Intelligent Variable Valve Timing System)
VVT-i is Toyota's unique engine technology, which is very mature. In recent years, domestically produced Toyota cars, including the new Vios, are mostly equipped with the VVT-i system. Similar to the principle of Honda's VTEC, the biggest feature of this system is that it can control the intake camshaft according to the engine's state, optimize the valve timing by adjusting the camshaft angle, so as to obtain the best valve timing, thereby improving torque in all speed ranges, and improving fuel economy, thereby effectively improving vehicle performance.
9. Dual VVT-i: (Dual Intelligent Variable Valve Timing Engine)
Dual VVT-i refers to the separate control of the engine's intake and exhaust systems. During rapid acceleration, the VVT-i that controls the intake will advance the intake time and increase the valve lift, while the VVT-i that controls the exhaust will delay the exhaust time. This effect is like a smaller turbocharger, which can effectively improve engine power. At the same time, due to the increased intake, the gasoline combustion is also more complete, achieving the purpose of low emissions.
10. D-CVVT: (Dual Variable Valve Timing, Variable Intake System Engine)
Rohens' basic configuration, the V-6 Lambda engine uses dual variable valve timing (D-CVVT) technology on both the intake and exhaust camshafts, and is equipped with a new variable intake system (VIS), which increases the intake of the cylinder, thereby improving fuel efficiency. The 3.8-liter V-6 engine has a power of 290 horsepower. Despite its powerful output, it does not affect its environmental protection and ultra-low emission control (ULEV) characteristics. Among them, the Aisin 6-speed automatic transmission with overdrive is indispensable, and its shifting performance is smooth and the transmission ratio is wide, which ensures Rohens' powerful power and excellent fuel economy.
11. TDI: (Turbocharged Direct Injection Engine)
TDI technology allows fuel to be directly injected into the cylinder through a high-pressure injector. Because the shape of the piston top is a concave bowl-shaped design, the fuel will form a spiral mixture in the cylinder. The Bora TDI is equipped with Volkswagen Group's pioneering direct injection turbocharged diesel engine (TDI) technology, which is very advanced and uses a number of advanced technologies, such as the pump injection system and the adjustable vane turbocharger, which are used for the first time in domestically produced cars. The Bora TDI uses the latest high-pressure fuel injection technology—the pump injection system. This system makes the diesel and air mix more fully and burn more thoroughly; at the same time, it uses an oxidation catalytic reactor to greatly reduce the emission of CO, HC, and particles, and the CO2 emission is reduced by 30% compared with gasoline vehicles of the same displacement. In addition, the EGR system is used to greatly reduce the generation of NOx, and its emission standards meet the Euro 3 standard. The "TDI logo" of the Volkswagen diesel engine is currently recognized as the most successful diesel engine in the world.
12. GDF-P: (Diesel Engine)
The hydraulic timing device of the distribution pump uses a timing piston to drive the roller frame to move and adjust the injection timing. The high-pressure chamber of the timing piston communicates with the pump chamber, and the pump chamber pressure increases with the increase of speed. The pressure in the high-pressure chamber of the piston increases with the increase of speed, and the injection timing advances. The Jetta electronic control system connects the electric valve N108 in series between the high and low pressure chambers of the piston, controls the pressure difference between the high and low pressure chambers by duty cycle, changes the injection timing, and the duty cycle is large, the pressure difference is small, the timing is delayed, and the injection timing is detected by the needle valve lift sensor G80, and the injection timing is closed-loop controlled. The GDF-P diesel engine from Volkswagen is quite popular.
13. FSI: (Direct Injection Stratified Combustion Engine)
FSI is a new technology in the field of gasoline engines, referring to stratified fuel injection. It is somewhat similar to the high-pressure fuel supply technology of diesel engines. It is equipped with an on-demand fuel supply system, which then provides the required pressure through a piston pump, and finally, the fuel injector injects fuel directly into the combustion chamber at the most appropriate time. Through the design of the internal shape of the combustion chamber, a richer mixture will be formed around the spark plug, while other areas will be a leaner mixture, ensuring lean combustion as much as possible under the condition of smooth ignition, which is the essence of stratified combustion. FSI has significantly improved power compared to engines of the same level, but fuel consumption can be reduced by about 15%.
14. TFSI: (Turbocharged Stratified Fuel Injection Engine)
The additional "T" in this name represents Turbocharger, and the engine itself is indeed a FSI engine with a turbocharger added. Turbocharging uses the high temperature and pressure of the exhaust gas to drive the exhaust gas turbine to rotate at high speed, driving the intake turbine to compress the intake air, increasing the air density. At the same time, the computer controls the increase in fuel injection, and with the high-density intake air, the engine efficiency can be improved without changing the displacement. FAW-Volkswagen and SAIC Volkswagen call their 1.4 TFSI and 1.8 TFSI engines 1.4 TSI and 1.8 TSI, which is extremely irresponsible. At the same time, in order to avoid disagreements about the abbreviation of TFSI as TSI, the manufacturer explained that: "Because we generally use three words to refer to the unique technology of the engine in our consistent system, this time we abbreviate TFSI as TSI, where T represents turbocharging, and SI represents direct injection technology." The latest TSI engines in domestically produced models such as Magotan and Sagitar are not the same as the TSI mentioned above. The Magotan 1.8 TSI and the 1.4 TSI engine to be installed in the Sagitar have actually removed the mechanical supercharger and stratified fuel injection technology. Of course, this is also a consideration of fuel quality and cost after domestication. Because a mechanical supercharger kit costs at least 15,000 yuan, it needs to be replaced every 50,000 kilometers, and a more expensive turbocharger needs to be replaced after 100,000 kilometers.
15. TSI: (Mechanical Turbocharged and Fuel Direct Injection Engine)
The design of the TSI (twin-turbocharged stratified fuel injection engine) is ingenious. It actually combines a turbocharger and a supercharger into one engine. The "T" in TSI does not stand for Turbocharger but Twincharger. As mentioned above, turbocharged engines have a power gap at both low and high speeds. To further improve engine efficiency, a mechanical supercharger is added, and it increases intake pressure at low speeds. The size of the turbocharger can be increased to compensate for the power gap at high speeds, thus achieving excellent power performance from low to high speeds.
16. Continuously Variable Valve Timing Engine
A continuously variable valve timing drive device of a Volkswagen engine includes a valve with a valve spring, a rocker arm that drives the valve to reciprocate, and a rotating cam that drives the rocker arm to swing. The cam is a multi-condition cam that can change the valve lift and opening and closing time. The cam profile of the multi-condition cam is: one end is a low-speed, low-load cam profile, and the other end is a high-speed, high-load cam profile. Between the low-speed, low-load cam profile and the high-speed, high-load cam profile is a smoothly transitioned medium-speed load cam profile. A servo motor is connected to the multi-condition cam, which can move the multi-condition cam along its axial direction. Because the cam profile of the multi-condition cam is continuously smooth, it can be steplessly controlled as needed, realizing continuously variable valve timing. In addition, the cam profile of the multi-condition cam covers various operating conditions of the engine, so this utility model can well meet the variable operating condition needs of the engine.
17. AVS: (Variable Valve Lift System)
AVS refers to the variable valve lift system, also known as the two-stage variable timing control system. In general, engines equipped with this system will be able to save fuel and energy to a large extent, while also increasing horsepower. This technology is widely used in Audi cars.
18. VAD: (Variable Intake Manifold System)
Under the control of the PCM, when the engine outputs high power, the VAD channel is opened in time (one more channel is opened, which is equivalent to increasing the channel diameter), which can maximize the engine's air demand and fully exert the engine's power performance. This technology is widely used in Mazda vehicles.
19. VIS (Variable Intake Manifold System)
Under the control of the PCM, high torque is maintained in the range from low load and low speed to high load and high speed. Working principle: Change the effective length of the intake manifold to effectively control the flow inertia of the intake airflow in the intake manifold, so that the frequency of the airflow pressure wave and the frequency of the intake valve match in time under different operating conditions, thereby maximizing the intake air volume of the engine under any operating conditions. In essence, it uses the principle of inertial harmonic supercharging to achieve the maximum intake air volume of the engine. When the engine speed is below 4400 rpm, VIS is not working, and the VIS valve is closed, and the airflow path is longer; when the engine speed is above 4400 rpm, VIS is working, and the VIS valve is open, and the airflow path is shorter; this meets the air volume demand under different operating conditions.
20. VTCS: (Variable Swirl Control System)
The intake manifold is opened to different degrees at different water temperatures and speeds to meet the air requirements of the engine under various operating conditions. Principle: Under the same operating conditions, different VTCS valve openings change the airflow velocity into the engine, forming a vortex, which is the swirl we often talk about, making the engine's fuel-air mixture more thorough. Especially when the engine is cold-started at low temperatures and the engine is under low load, the atomization of the mixture is poor, the combustion is incomplete, and the emissions are poor. In order to improve the atomization level of gasoline at low temperatures and improve the emission level of the engine, the emission level of Mazda 6 reaches and exceeds the Euro III standard. Working process: When the water temperature is below about 62 degrees and the engine speed is below 3750 rpm, the passage area of the intake pipe is reduced; as the water temperature further increases and the speed further increases, the VTCS valve is fully opened, and the area of the intake pipe reaches its maximum.
Essential details and precautions for using a micro-tiller
A micro-tiller is an agricultural mechanization tool mainly used for deep plowing, loosening soil, and tillage. It is a common type of agricultural machinery in rural areas.
2025-05-21
Types and operating principles of generator sets
Diesel Generator Set: Uses a diesel engine as a power source, generating heat energy by burning diesel fuel, which in turn drives a generator to produce electricity.
2025-05-21
Differences between gasoline and diesel engines
A significant difference between diesel and gasoline engines lies in the fuel they use.
2025-05-21
Maintenance and repair of micro-tillers
Currently, as a small type of agricultural machinery, almost every household has a small micro-tiller. Sometimes, if there are minor problems with the micro-tiller, how can one perform simple maintenance and repair? First, the micro-tiller uses gear transmission, with no power loss, wide tillage width, deep tillage depth, strong adaptability, and can easily handle various soil types with high efficiency. Problems may occur during the use of the micro-tiller. When problems occur, repairs should be carried out promptly, and the repair technician must be logical. The following is a four-step repair method for micro-tillers. 1. Cleaning of the site and machine when using the micro-tiller
2022-01-06
Main manufacturer of domestic gasoline engines, generator sets, water pump units, micro-cultivators, and range extenders
Supplier Management | Certificate Report Inquiry | QR Code Instruction Manual | Exhibition Warm-up | 3D Display | QR Code Introduction | After-sales Service Appointment | Document Information Inquiry | QR Code Report | QR Code Certificate
Address: Building 7, No. 33, Jinsha Road, Jinzha Street Office, Hechuan District, Chongqing
Mobile Website
