With the increasing awareness of environmental protection and increasingly stringent emission regulations, environmental improvement technology for gasoline engines has become a hot topic for research and development. The following are several major environmental improvement technologies:
I. Electronically controlled injection technology
1. Technical features
- Electronically controlled injection technology refers to the precise control of injection time and injection amount by an electronic control unit (ECU) to optimize the combustion process. This technology can improve fuel economy and reduce emissions.
- Electronically controlled injection technology includes many types, such as single-point injection, multi-point injection, sequential injection and direct injection. Among them, direct injection technology is favored because it can achieve more uniform mixture distribution and higher combustion efficiency.
II. Turbocharging technology
1. Technical features
- Turbocharging technology drives the turbine by using the energy of exhaust gas, which in turn drives the compressor to compress the intake air and increase the intake density. This enables the engine to output more power without increasing the displacement, while reducing emissions by optimizing the combustion process.
- Turbocharging technology not only improves the power performance of the engine, but also indirectly reduces fuel consumption and emissions by improving combustion efficiency.
3. Exhaust Gas Recirculation (EGR) Technology
1. Technical Features
- EGR technology reduces the generation of nitrogen oxides (NOx) by reintroducing a portion of the exhaust gas into the intake system to reduce the combustion temperature. This technology can significantly reduce emissions without sacrificing power performance.
- EGR technology is often used in conjunction with electronically controlled injection and other emission control technologies to achieve better emission reduction effects.
4. Catalytic Converter
1. Technical Features
- A catalytic converter is a device installed in the exhaust system that uses a catalyst to convert harmful exhaust components into harmless substances. Common catalytic converters include three-way catalytic converters, which can simultaneously reduce the emissions of hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx).
- The effect of the catalytic converter depends on the choice of catalyst and the exhaust temperature. Modern gasoline engines are usually equipped with high-efficiency three-way catalytic converters to meet strict emission standards.
5. Particulate Filter
1. Technical Features
- Particulate filters are mainly used to capture particulate matter (PM) in the exhaust and reduce pollution to the environment. This technology is particularly suitable for diesel engines, but some gasoline engines are also equipped with particulate filters.
- The particle filter needs to be regenerated regularly to avoid clogging. The regeneration process is usually carried out by increasing the exhaust temperature to burn the captured particles.
VI. Variable Valve Timing and Lift Technology
1. Technical Features
- Variable Valve Timing and Lift Technology (VVT/VVL) optimizes the intake and exhaust processes by changing the time and lift of the valve opening. This technology can adjust the valve opening and closing timing according to different engine operating conditions to improve combustion efficiency and reduce emissions.
- VVT/VVL technology can significantly improve the performance of the engine at low and high speeds while reducing fuel consumption and emissions.
VII. Lean Burn Technology
1. Technical Features
- Lean burn technology refers to combustion at a higher air-fuel ratio to reduce fuel consumption and emissions. This technology is usually used in combination with direct injection and turbocharging technology to achieve higher combustion efficiency.
- Lean burn technology can significantly reduce the generation of nitrogen oxides, but may increase hydrocarbon and carbon monoxide emissions. Therefore, it is usually necessary to use it in conjunction with other emission control technologies.
The application of these environmental improvement technologies enables modern gasoline engines to achieve lower emissions while maintaining high performance, better meeting the needs of environmental protection.
