A car engine is an engine that powers a car and is the heart of a car, affecting the power, economy, and environmental friendliness of the car. Depending on the source of power, automotive engines can be classified into diesel engines, gasoline engines, electric vehicle motors, and hybrids.
The working principle of gasoline engine (gasoline engine): The four-stroke gasoline engine is a mixture of air and gasoline into a good mixed car engine. It is sucked into the cylinder during the suction stroke. The mixture is compressed and ignited to generate heat. The high-pressure gas acts on the top of the piston, pushes the piston to reciprocate linearly, and outputs mechanical energy through the connecting rod and the crankshaft flywheel mechanism. The four-stroke gasoline engine completes a duty cycle during the intake stroke, compression stroke, power stroke, and exhaust stroke.
1.SOHC (single overhead camshaft engine)
Based on the type of engine that is divided by the number of camshaft positions, SOHC stands for a single overhead camshaft engine for 2-valve engines.
2 DOHC (Double Overhead Camshaft Engine)
Represents a dual overhead camshaft engine for multi-valve engines. Usually, the engine has two valves per cylinder. In recent years, there have been four valves and five-valve engines. This has undoubtedly opened up a way to improve the efficiency of the intake air at high engine speeds. These engines are suitable for high speed engines and can be used to reduce fuel consumption at high speeds.
3. Turbo (turbocharged)
That is, turbocharging, which is abbreviated as T, is generally marked with the words 1.8T, 2.8T, etc. at the rear of the vehicle. Turbo has single turbo and twin turbo. We usually refer to turbocharging, which is turbocharged. Generally, the exhaust gas drives the impeller to drive the pump wheel to send more air to the engine, thus improving the engine. The power while reducing the fuel consumption of the engine.
4. VTEC (variable valve timing phase and valve lift electronic control system)
Developed by Honda, VTEC is the world's first valve control system that can simultaneously control both valve opening and closing times and lifts. It has now evolved into i-VTEC. The biggest difference between an i-VTEC engine and a normal engine is that two different valve-actuated cams are used in the low- and high-speed engines, and can be automatically converted by an electronic system. In addition, the engine can automatically change the opening time and the degree of lifting of the valve according to the driving condition, that is, changing the intake air amount and the exhaust amount, thereby achieving 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 i-vtec system has been installed on the engine of the latest Honda sedan. Honda's i-vtec system continuously adjusts valve timing and regulates valve lift.
Its working principle is: when the engine is switched from low speed to high speed, the computer automatically presses the oil against the small turbine in the intake camshaft drive gear, so that under the action of the pressure, the small turbine is relative to the gear The shell rotates at a certain angle, so that the camshaft rotates forward or backward within a range of 60 degrees, thereby changing the timing of opening the intake valve to achieve the purpose of continuously adjusting the valve timing.
6. CVVT (continuous variable valve timing system)
South Korea's automobile industry has always been known for its advanced technology, so the technology used is mostly based on the experience of Germany and Japan, and CVVT is developed on the basis of VVT-i and i-VTEC. Taking the CVVT engine of Hyundai Motor as an example, it can control the opening and closing of the valve at any time according to the actual working condition of the engine, so that the fuel can be burned more fully, thereby achieving the purpose of improving the power and reducing the fuel consumption. However, CVVT does not control the lift of the valve, which means that the engine only changes the time of suction and exhaust.
7. VVT (continuous variable valve timing engine)
The system adjusts the phase of the engine cam through the equipped control and execution system, so that the valve opening and closing time changes with the engine speed 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, domestic Toyota cars, including the new Vios, have been equipped with VVT-i systems. Similar to Honda's VTEC principle, the biggest feature of the system is that it can control the intake camshaft according to the state of the engine. By adjusting the camshaft rotation angle, the timing of the valve timing is optimized to obtain the best valve timing, thus at all Increased torque over the speed range and improved fuel economy for improved vehicle performance.
9. Double VVT--i (Double Intelligent Variable Valve Timing Engine)
Dual VVT-i refers to the intake and exhaust systems that control the engine separately. In the case of rapid acceleration, the VVT-i that controls the intake will advance the intake time and increase the lift of the valve, while the VVT-i that controls the exhaust will delay the exhaust time. This effect is like a smaller turbocharger. Can effectively improve engine power. At the same time, due to the increase in the amount of intake air, the combustion of gasoline is also more complete, achieving the goal of low emissions.
10. D-CVVT (Double Variable Valve Timing, Variable Intake System Engine)
The basic configuration of the Rohens, 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 air volume of the cylinder, thereby improving the efficiency of the fuel.
The 3.8-liter V-6 engine is powered by 290 hp, and despite its powerful output, it does not affect its environmentally friendly and ultra-low emission control (ULEV) characteristics. Among them, the Aisin 6-speed automatic transmission with overspeed is indispensable, its smooth transmission performance and wide transmission ratio, which guarantees the powerful power and excellent fuel economy of Rohens.
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