With the vigorous development of infrastructure construction and the implementation of the Western Development Strategy in China, the country's construction machinery industry has gained a great opportunity for development. At the same time, the country has strengthened its control over environmental protection during development. For example, it controls engine exhaust emissions and the noise levels of construction machinery. The requirement that the use of construction machinery should not harm the human living environment is an inevitable trend. This prompts us to improve the technical quality of concrete construction machinery. If we only focus on reducing costs without simultaneously ensuring our products keep pace with the times, it will ultimately affect the future of the products themselves. We believe that the sustainable development technology of concrete construction machinery should currently focus on: ① energy conservation; ② pollution reduction; ③ performance improvement; ④ efficiency enhancement. This article mainly discusses energy conservation and pollution reduction. 1. Measures for Energy Conservation and Improving Engine Exhaust Pollution Energy conservation not only has significant economic benefits for users but also helps protect Earth's resources and promotes the sustainable development of human society. Energy conservation and pollution reduction are closely related. The entire process of energy extraction, transportation, processing, and use is one of the most polluting aspects of the Earth's environment. The main harmful substances in diesel engine exhaust are CO, HC, NOx, sulfur compounds, and carbon particles. Generally, diesel engines emit 30 to 40 times more carbon particles due to incomplete combustion than gasoline engines. Currently, national regulations on controlling vehicle emissions are gradually being implemented, and vehicles that do not meet Euro II emission standards will be prohibited from entering major cities. Computer-controlled turbocharged intercooled diesel engines, such as the Volvo FML2 engine, have unique advantages in reducing engine exhaust emissions. The computer-controlled fuel injection system mainly consists of three parts: sensors, actuators, and an electronic control unit (ECU). The ECU is either an engine computer or a central processing unit (CPU). Sensors include various types such as intake air temperature and pressure sensors, load sensors, and oil temperature and pressure sensors. The actuator is a unit pump driven by a solenoid valve. The signals from each sensor are collected and analyzed by the engine computer or CPU, then converted into control signals to control the optimal fuel injection quantity, injection timing, and intake air volume of the diesel engine. Some electronically controlled diesel engines can analyze the composition and content of exhaust gases after combustion. When incomplete combustion results in black smoke, the engine can immediately adjust the fuel-air mixture concentration to eliminate this phenomenon. Because these engines employ turbocharging and intercooling technology, the exhaust gases produced during the initial combustion are further purified through secondary combustion via the exhaust gas recirculation (EGR) system, improving energy efficiency and significantly reducing fuel consumption. These types of electronically controlled diesel engines can meet or exceed Euro II emission standards. Another significant advantage of computer-controlled diesel engines is their greatly enhanced power output. When the engine load changes, the computer can immediately sense and adjust the engine's output. For engines without turbocharging and intercooling, exhaust filters can be used to improve exhaust emissions. For example, exhaust filters using ceramic foam and wall-flow ceramic honeycomb structures, or those based on electrostatic particulate capture principles, are effective at capturing carbon particles in exhaust gases; exhaust filters using zeolite as an adsorbent are effective at absorbing HC compounds in exhaust gases. In addition, adding smoke-reducing additives to diesel fuel and avoiding the use of inferior diesel fuel containing heavy diesel components are effective measures to improve combustion efficiency and reduce emissions. Another method is to appropriately limit the maximum power output of the engine; for example, the Isuzu CXZ81Q truck's 1OPE diesel engine uses this method to meet Euro I emission standards. 2. Measures to Reduce Engine and Overall Machine Thermal Pollution The thermal pollution generated by the vast number of various types of heat engines worldwide is another important factor contributing to the deterioration of the Earth's ecological environment and climate. Its greenhouse effect leads to glacial melting, rising sea levels, climate change, and frequent droughts and floods. The power units, hydraulic circuits, and certain actuators of concrete construction machinery are all heat sources. Therefore, reducing thermal pollution from concrete construction machinery is also an issue that manufacturers should be concerned about. Currently, measures can be taken, such as selecting engines with high energy conversion rates and low heat consumption; minimizing friction and strengthening lubrication in the design of moving mechanical parts (especially high-speed moving parts); and minimizing pipeline flow resistance in the design of hydraulic circuits to reduce heat generation. However, the most fundamental improvement still awaits the advent of new power units to replace current heat engines. 3. Measures to Reduce Noise from Concrete Construction Machinery With the deepening of national environmental protection controls, environmental protection departments will gradually eliminate outdated construction machinery and methods that cause serious noise pollution. Therefore, further reducing the operating noise of concrete construction machinery is an issue that all concrete machinery manufacturers must pay attention to. Excessive noise primarily damages the human auditory system. According to data, prolonged exposure to noise levels of 85 decibels will cause hearing loss; while noise levels above 90 decibels can lead to deafness or severe hearing loss. The short-term tolerance limit of the human ear to loud noise is approximately 125 decibels. Noise frequencies below 500 Hz are called low-frequency noise (such as the low-speed sound of air compressors, cars, and tractors); frequencies between 500 and 1000 Hz are called mid-frequency noise; and frequencies above 1000 Hz are called high-frequency noise. The human auditory range is 20–20,000 Hz, with the greatest sensitivity to sounds around 1000 Hz. Noise generated by concrete construction machinery can be divided into power machine noise (engine, motor, oil pump, etc.) and noise from transmission and actuators. Several noise control measures are introduced below. (1) Sound insulation and noise reduction technology: Sound insulation and noise reduction technology mainly uses soundproof enclosures to isolate the sound source from the outside world. The soundproof enclosure is generally lined with a damping layer or damping coating to enhance the sound insulation effect. For heat engines, in order to meet the needs of heat dissipation and ventilation, there must be an air inlet or exhaust port. At this time, silencers need to be installed on the air inlet and exhaust port to maintain the sound insulation effect. This method can generally reduce noise by 15 to 30 decibels. (2) Vibration isolation and noise reduction technology: Noise is often caused by the vibration of machines or fluids. Therefore, reducing vibration is a more fundamental noise reduction method. For example, the noise generated by the operation of oil pumps contains hydraulic noise and mechanical noise. Hydraulic noise is generated by cavitation in the liquid and the periodic pulsation of pressure and flow when the liquid is discharged; mechanical noise is caused by the imbalance of rotating parts, poor bearings, and component resonance. Hydraulic noise is the main component of pump noise. It increases with the increase of pump speed, and the noise frequency also increases with the increase of pump speed. Improving the design of pumps and hydraulic systems is the fundamental way to reduce hydraulic noise. Soundproof covers can also be used. When the mechanical vibration generated by the power components and their supports is obvious, vibration isolation and noise reduction technology can achieve significant results. Generally, rubber damping pads (blocks), springs and cork are used as damping elements. More advanced methods include gas-liquid damping methods such as oil-gas springs. The installation method also has a great influence on the vibration isolation effect. For example, the cab of VOLVO trucks uses double spring damping plus inner sound-absorbing material, which achieves a significant quiet effect in the cab. (3) Sound absorption and noise reduction technology: technology to absorb and attenuate sound wave energy. Sound-absorbing materials are generally porous sound-absorbing materials. 90% of porous materials are tiny interconnected cavities. These microcavities generate viscous resistance and friction on vibrating air molecules. The vibration kinetic energy of the molecules is converted into heat energy, which attenuates the sound energy. (4) Sound cancellation technology: A noise reduction system using sound cancellation technology consists of a set of sound wave detectors, an information processor, and a sound synthesizer. The detectors send data such as the intensity and direction of the noise they detect to the information processor. After analysis, the information processor instructs the sound synthesizer to generate a sound wave signal with the same amplitude but opposite direction to the noise wave, thus canceling out the noise. This technology has been applied in noise reduction of air conditioning systems in the UK, achieving a noise reduction effect of about 10 decibels.