1, SOHC
According to the type of engine divided by the number of camshaft positions, SOHC represents a single-overhead camshaft engine for 2-valve engines.
2, DOHC
(Double overhead camshaft engine) that double overhead camshaft engine, suitable for multi-valve engine.Usually the engine has two valves per cylinder, in recent years also continue to appear 4-valve, 5-valve engine, which is undoubtedly to improve the engine Intake efficiency at high speeds opens up the way for such engines to be used in high-speed engines and to reduce fuel consumption at high speeds.
3, Turbo
(Turbocharged) Turbocharged, its abbreviation is T, usually marked with 1.8T, 2.8T and other words at the rear. Turbocharged single turbo and twin turbo, we usually refer to the turbocharger Refers to the exhaust gas turbocharged, usually through the exhaust emissions driven impeller driven pump wheel, more air into the engine, thereby increasing the engine power, while reducing engine fuel consumption.
4, VTEC
(Variable Valve Valve Phase and Valve Lift Electronic Control System) Developed by Honda, VTEC is the world's first valve control system that controls both valve opening and closing time and lift in two different situations and has now evolved into i-VTEC. The biggest difference between an i-VTEC engine and a normal engine is that two different sets of valve actuation cams are used at medium and low speeds and at high speeds, which can be automatically switched by the electronic system. In addition, the engine can automatically change the valve according to driving conditions The opening time and degree of improvement, that is, to change the amount of intake and exhaust, so as to increase power, reduce fuel consumption purposes.
5, i-VTEC
(Intelligent variable valve timing and lift system) i-vtec system is Honda's smart variable valve timing system in English abbreviation, the latest Honda sedan engine has been generally installed i-vtec system. Honda's The i-vtec system continuously adjusts the valve timing and regulates the valve lift.The operating principle of the i-vtec system is that when the engine is switched from low speed to high speed, the computer automatically presses the oil into the intake camshaft drive gear So that under pressure the small turbine rotates a certain angle relative to the gear housing so that the camshaft rotates forward or backward within 60 degrees thereby changing the moment of opening of the intake valve to The purpose of continuously adjusting the valve timing.
6, CVVT
(Continuously variable valve timing system) South Korea's automobile industry has always been not known for advanced technology, so the technology used are mostly drawn on the experience of Germany, Japan and other countries, and CVVT is in the VVT-i and i-VTEC Based on the CVVT engine, for example, it can control the valve opening and closing at any time according to the actual conditions of the engine, the fuel combustion more fully, so as to achieve the purpose of improving power and reduce fuel consumption.But CVVT will not Control valve lift, which means that this engine just changed the suction, exhaust time.
7, VVT
(Continuously Variable Valve Timing Engine) This system adjusts the phase of the engine cam through the control and execution system provided, so that the valve opening and closing time varies with the engine speed to increase the charging efficiency and increase the engine speed power.
8, VVT-i
(Intelligent Variable Valve Timing System) The VVT-i is Toyota's unique engine technology and is well established. Most domestically produced Toyota cars, including the new Vios, have been equipped with the VVT-i system in recent years. In contrast to Honda's VTEC principle Similarly, the most prominent feature of this system is that the intake camshaft can be controlled according to the state of the engine, and the timing of the gas distribution can be optimized by adjusting the camshaft rotation angle so as to obtain the optimal valve timing so as to increase the torque in all speed ranges, And can improve fuel economy, thus effectively improving the performance of the car.
9, double VVT - i
(Dual Smart Variable Valve Timing Engine) Dual VVT-i refers to the separate control of the engine's intake system and exhaust system. In rapid acceleration, controlling the intake VVT-i will advance the intake time and increase the valve Of the lift, while the control of exhaust VVT-i will delay the exhaust time, this effect is like a smaller turbocharger, can effectively improve the engine power.At the same time, due to increased intake, but also makes Gasoline combustion more complete, to achieve the purpose of low emissions.
10, D-CVVT
(Dual Variable Valve Timing, Variable Intake System Engine) With Rohens' basic configuration, the V-6 Lambda engine incorporates dual variable valve timing on the intake and exhaust camshafts (D- CVVT) technology, and equipped with a new variable intake system (VIS) to improve the cylinder's intake, thereby increasing fuel efficiency.Configuration 3.8-liter V-6 engine power of 290 horsepower, despite the powerful output, But did not affect its characteristics of environmental protection and ultra-low emission control (ULEV) .Among them, with love letter 6-speed automatic transmission with overdrive, its transmission performance is smooth, wide transmission, it is these guarantees Rohens strong motivation and excellent fuel economy.
11, TDI
(Turbo direct injection supercharged engine) TDI is the English abbreviation of TurboDirectInjection, which means turbocharged direct injection (diesel engine) .In order to solve the inherent deficiencies of SDI, people installed in the diesel engine turbocharger, making the intake pressure greatly Increase, the compression ratio is generally more than 10, so that you can achieve very high torque at low speeds, and due to more fully burned, the emission of harmful particles also greatly reduce the TDI technology to make the fuel through a high-pressure jet Directly into the cylinder, because the top of the piston shape is a concave bowl design, the fuel will form a spiral in the cylinder gas mixture. Polaris TDI equipment Volkswagen Group's first direct injection turbocharged diesel engine (TDI) technology is very advanced, and uses a number of advanced technologies, such as pump injection system, adjustable vane turbocharger, etc. are the first time in the domestic sedan applications.Borai TDI uses the latest high-pressure fuel injection technology - - Pump injection system. This system allows diesel and air mixture more fully, more thorough combustion; at the same time the use of catalytic oxidation Which greatly reduces the emission of CO, HC and particulates, of which the CO2 emission can be reduced by 30% compared with that of the same displacement gasoline.In addition, the EGR system is adopted to greatly reduce the production of NOx and meet the emission standards of Euro 3. Volkswagen Diesel The "TDI logo" of the engine is precisely the most successful diesel engine recognized in the world.
12, GDF-P
(Diesel Engine) The hydraulic timing device of the distribution pump is driven by the timing piston to regulate the injection timing, the high pressure chamber of the timing piston is communicated with the pump chamber, the pressure of the pump chamber rises with the increase of the rotation speed, Pressure increases with increasing speed, fuel injection timing in advance. Jetta electronic control system in series between the piston high and low pressure electric valve N108, duty cycle control of high and low pressure chamber pressure, fuel injection timing changes, duty It is smaller than large differential pressure, timing lag, and fuel injection timing is detected by needle valve lift sensor G80, and closed-loop control is performed on injection timing. Volkswagen's GDF-P diesel engine is more popular.
13, FSI
(In-Cylinder Stratified Combustion Engine) FSI is a new technology in the field of gasoline engines, meaning stratified fuel injection.
