With the increasing contradiction between the current social development and the environment, resources, as one of the pillars of the manufacturing industry, the automobile industry must also follow the development of the times. The improvement of high pollution, high energy consumption engine becomes more and more urgent. Various types of new energy engines have been developed. The power of new energy engine is mainly electric energy. The power source can be battery, fuel cell, solar cell, etc. its advantages are low emission and low noise. The development of new energy engines is of great practical significance to solve the energy and environmental problems faced by the sustainable development of China’s automobile industry.
In the United States, the main development direction of new energy engine is integration, motor and battery integration, motor and engine integration. Through integration, the engine can adapt to different power sources. European and American countries are similar to Japan, but the environmental indicators in Europe are more stringent than those in the United States, which also makes them perform more strongly in the development of new energy engines. In the past decade, the European region has mainly developed w diesel power instead of gasoline powered vehicles, but now they are actively transitioning to electric power. The rapid development of small electric vehicle applications in Europe and other places is closely related to their local policies, such as strict emission standards and various supports for pure electric passenger vehicles. Different from the United States, biofuels in Europe mainly come from non food crops. Fuel production will not cause food prices to rise, which will cause various social problems. Therefore, biofuel technology in Europe also has great advantages.
Japan is different from the two regions mentioned above. Japan is neither as dependent on heavy oil waves as the United States, nor as sensitive to carbon dioxide emissions as Europe. For new energy engines, Japan pursues a competitive orientation. In Japan, various types of new energy power have made great progress, especially Toyota, Honda, Nissan and other major automobile manufacturers, which have strong technology accumulation in hybrid, pure electricity, fuel cell and other aspects. The three major manufacturers have their own emphasis on new energy power. They launch different products for different markets, which is very competitive in the market.
In 2009, according to the changing demands of environment and international oil market, the state issued a series of new policies on engine emissions. The new energy engine with low emission has naturally become the direction pursued by various automobile enterprises, which focuses on the passenger car industry.
However, at present, the domestic bus enterprises have insufficient reserves in the technology of Haihe power engine, and most of them adopt foreign technology. China’s independent Haihe power system includes ychpt and ISG. The former adopts parallel structure, and diesel engine and motor can be driven separately. The latter is a hybrid structure, which directly installs the disc integrated starter / generator at the output end of the internal combustion crankshaft, replacing the flywheel and the original starter and generator as the auxiliary power source of the vehicle. Based on the strategic consideration of environmental protection and energy sustainable development, many famous foreign automobile companies such as Ford, Honda, Bosch, xikouzi have developed or adopted ISG technology. ISG integrates the technology of electric motor, modern power electronics, digital signal processing and modern control, and integrates the start and power generation functions of traditional vehicles. It has outstanding advantages of fast start / stop control, good energy recycling and strong power assistance, especially in reducing exhaust pollution and saving fuel. It is internationally recognized as a traditional vehicle and hybrid vehicle And the inevitable development direction of the engine parts of electric vehicles in the future. Vehicles with ISG system have the following advantages:
(1) In the start-up stage, electric power is used to assist the engine, which avoids the large fuel consumption of the traditional engine.
(2) ISG system can convert the kinetic energy of the car into electric energy recovery, which can be used for driving electricity after storage.
(3) Because ISG is directly installed on the engine spindle, it can help to improve the power of the car at any time.
(4) In the long downhill, increasing the energy recovery coefficient can effectively improve the safety than the long-distance braking.