The engine is the heart of the automobile, the performance of the engine is the power, economy, emission and other performance of the vehicle fundamental. All automobile companies are constantly adopting new technologies in order to enhance the power of the engine and improve the thermal efficiency of the engine as much as possible.
Pressurization medium cold - air cooling and water cooling.
Turbocharging is the most effective way to increase the power. The engine's thermal efficiency is improved by using exhaust energy again.
2. Variable turbine section
Closed loop control method of pressurized pressure:
Exhaust valve control
Variable turbine section control
3. Overhead camshaft plus multiple valve
This is the 4 valve mechanism.
4. Direct injection in cylinder
Single spray, double spray, better organization of combustion process.
5. Variable intake manifold length
It can be divided into non-continuous variable and continuous variable air inlet pipe length to improve the air charging efficiency at each rotating speed.
6. Variable valve lift
Improve the charging efficiency at each rotating speed.
Variable compression ratio
Give consideration to both economic and dynamic performance.
8. Variable valve timing
Make full use of the inertia of air flow to increase the air intake volume.
9. Variable displacement (cylinder stopping technology)
This is the 8 cylinder machine stops 4 cylinders state.
10. Automatic start and stop (ISG, braking energy recovery)
ISG is a vehicle start generator integrated directly on the engine spindle. ISG is a blend of motor, modern power electronics, digital signal processing, such as modern control technology, integrating traditional automobile starting and generating function, has the outstanding play/stop control fast, good renewable energy utilization, power auxiliary strong wait for an advantage, especially in the obvious effects of reducing exhaust pollution, save fuel, is internationally recognized as conventional cars, hybrid cars and electric car engine parts inevitable development direction in the future. At present, the technology has completed the development of laboratory prototype.
11. New combustion system
Gas pressure combustion
HCCI combustion (homogeneous charge compression combustion)
Gasoline engine is homogeneous charge spark ignition and diesel engine is non-homogeneous charge compression ignition. If gasoline functions to achieve homogeneous charge compression ignition, relatively thin mixture gas can be adopted. Therefore, the torque can be adjusted according to the way of quality adjustment, and the throttle door is not required. It can further improve the thermal efficiency of the engine.
12. Thermal management system
Integrated exhaust pipe can make better use of waste energy.
13. Electrification and intelligentizationFrequency conversion electronic pump, etc.
The electronic pump, as the name implies, is an electron-driven pump, which drives the circulation of the cooling fluid to conduct heat dissipation. As it is electronic, it can adjust the working condition of the pump at will. That is to say, the rotating speed of the pump is very low when it is cold started, which helps to rapidly heat up, and can reduce energy consumption. It can also work under full load when heat dissipates at high power and is not controlled by engine speed, which can control water temperature very well!
14. Variable displacement oil pump
The traditional oil pump work, with the increase of engine speed, oil pressure is increased, the oil pressure is mainly through the inside of the oil pump pressure limiting valve, oil but at this moment this is still running at maximum output, not only consume the power of engine, and the input of energy into heat energy, accelerate the aging of the oil. Because the oil pressure is high, the engine loads accordingly, fuel consumption will be large; And the previous design of higher oil pressure, accordingly more oil will be involved in the combustion, oil consumption will be large, emissions will become worse.
Variable displacement oil pump to further improve fuel economy and emissions.
15. Double circulation
The otto cycle and the atkinson cycle
The atkinson cycle, compared with the traditional auth cycle of engines, is characterized by a longer working stroke than the compression stroke, which is often referred to as an expansion ratio greater than the compression ratio. Longer work runs can more effectively use the high pressure left by the combustion exhaust, so fuel efficiency is higher than conventional engines. Once you understand this, the atkinson cycle understands 70 percent. In addition, atkinson cycle is only suitable for high thermal efficiency in low speed areas. Over 3000 turns, affect engine power and thermal efficiency instead. So the atkinson cycle and the auth cycle need to be able to switch automatically. Also known as a dual cycle engine.