Analysis on the New Features of Chinese Forklift Industry

In recent years, with the successive introduction of the Tier4 emission standard in the United States, the European IIIB emission standard, and the China National 4 emission standard, the engineering machinery as a large emitter should go from what aspects to achieve the goals of energy conservation and emission reduction?

New Technology Helps Diesel Energy Saving and Emission Reduction
Diesel engines are widely used in various engineering machinery and equipment due to their low rotational speed, high torque and near-perfect engine performance curve. However, with the increasing global energy shortage and environmental awareness in recent years, the low utilization rate of traditional diesel engines has increased. High emission and large noise have begun to attract the attention of the industry and society. In order to cope with new development trends, various new technologies and new products for energy saving and emission reduction of diesel engines have also emerged one after another. For example, the most common type of diesel engine on construction machinery is now Diesel Common Rail, EFI and EGR (Exhaust Gas Recirculation) etc.

Diesel common rails provide ultra-high pressure diesel fuel to injectors (pressure up to 100MP or more) under the influence of new high-pressure pumps, engine control units and various types of sensors. At the same time, high-pressure common rails act as fuel for the injectors. The role of force. Therefore, diesel engines with high-pressure common rails are better atomized than conventional diesel engines and provide stable pressure diesel, so that more efficient combustion can be used to increase the efficiency of diesel use.

Because diesel common rails have the function of holding pressure and pressure, the requirements for system sealing are extremely strict. Once the pressure leaks in the system, the engine will not work.

EFI injectors spray more precisely into the combustion chamber

The electric fuel injector can be controlled by the electric unit to provide timely and accurate fuel supply and fuel cut to the cylinder according to the set markings to achieve the best injection time and fuel injection control. The traditional fuel injector is a mechanical type. When the high-pressure pump supplies fuel to the cylinder, the fuel injection is stopped and the fuel injection is stopped. Therefore, the use of the electronic fuel injection system will save more diesel than the traditional fuel injector.

Although the EFI injector can accurately perform diesel injection, compared with the direct injection injectors in the past, the structure is complicated, the cost is relatively high, and the quality of diesel oil is demanding, and the domestic diesel tagging is relatively low compared to the developed countries. In particular, the diesel produced by some small refineries is difficult to meet the requirements of the EFI injectors. Therefore, the EFI injectors are often damaged due to diesel during their use in the country. In addition, the electronic control methods also increase the probability of failure and Maintenance difficulty.

EGR system (exhaust gas recirculation) is a common additional device in construction machinery. It can capture a part of the exhaust gas after combustion, and the first combustion is not complete under the action of the original components such as the cooler and electronic control valve. The mixed gas is fed into the cylinder with fresh air and burned again. Because the exhaust gas contains a large amount of CO2, but CO2 cannot burn but absorbs a lot of heat, the combustion temperature of the mixture gas in the cylinder is reduced, thereby reducing nitrogen and oxygen. The amount of compound produced. Increased fuel utilization while significantly reducing harmful gas emissions.

Therefore, under the “help” of new technologies, diesel engines not only achieved the goal of saving fuel and reducing emissions, but also met the new standards for emissions, and were recognized by major host manufacturers.