Summary of the application status of new technolog

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Summary of the current situation of the application of new technologies for large and medium-sized passenger cars in the world

in the design, manufacturing and integration of large and medium-sized passenger cars, the co organizers: Taiwan Zhongyuan University, Hong Kong University of science and technology, Zhengzhou University, South China University of technology, Huazhong University of science and technology, Tsinghua University in Taiwan, the improvement of vehicle performance and quality, technological innovation and application of new technologies, enterprises from Germany, France, Italy and Sweden in Western Europe have always been in the leading position in the world. Among them, the application of new bus technology mainly includes several aspects

the safety of passenger cars continues to be strengthened

abs braking anti lock control system has become a common necessary equipment for foreign passenger cars. ASR anti drive wheel slip (which may lead to wheel side slip) system and EBS electronic control braking system with both ABS and ASR functions have been very popular on passenger cars in Western Europe, and have also been installed on high-end passenger cars in China, or according to user requirements. With the above functions, it can detect the possible rollover of the bus in time, and immediately send the ESP electronic driving stability system to the engine to reduce the output torque and to the wheels to adjust the driving force control and braking force distribution. It has also been installed on high-end buses in Western Europe

the scattered electronic control system of each assembly causes the complexity and difficulty of the installation, inspection and maintenance of the whole vehicle circuit. Therefore, the can whole vehicle bus control system that integrates all subsystems is extended from high-end cars to high-end buses. It responds quickly through the set computer program calculation and sends out relevant instructions to adjust the working condition of the engine, the power of each wheel and the increase or decrease of braking force, so as to ensure the safe driving of the whole vehicle and avoid collision and rollover accidents

with the continuous improvement of active safety performance requirements, radar, ultrasonic, infrared and other detection, camera, driver drowsiness detection and alarm devices installed at the front, rear and both sides of the car body continue to increase, forming another set of auxiliary driving system. All kinds of information about the driving condition of the whole vehicle are scrolled in groups on the display screen in the middle of the instrument panel, and more accurate digital displays appear, such as fuel stock and brake air pressure. When these information numbers exceed the preset normal allowable value, the red light will flash, and then there will be an audible alarm, or even a voice report, to introduce the safety device of the 1-pull testing machine, and then actively force the relevant commands and actions to ensure driving safety

in terms of passive safety performance, the full load-bearing body with closed ring skeleton structure has become the mainstream form of large passenger cars. While greatly improving the overall stiffness and strength of the body and underframe, it also correspondingly reduces the weight of the body, reaching or even exceeding the rolling strength requirements of the bus with the world's strongest body strength standard, ensuring that there is still enough living space for passengers after the vehicle rolls. The safety doors and safety skylights used for passengers to leave the car body after the accident have also been adequately arranged. The arched structure of the front wall of the car body is also an effective way to resist frontal collision, disperse the impact force and reduce the impact deformation

the environmental protection technology of passenger cars is further improved

in order to achieve the Euro III exhaust emission index, the engines of large passenger cars in Western Europe have generally adopted new technologies such as high-pressure common rail electronically controlled fuel injection, with the fuel injection pressure as high as 1600 bar, which is not affected by the change of engine speed, so as to ensure that the atomization is always in the best state. The oil holes of the fuel injection nozzle are thinner, and the number increases to 8 holes, which is arranged in two layers, ensuring that the spray is thinner and more evenly distributed in the cylinder. The application of multiple fuel injection, stratified combustion and other technologies not only enables the engine to burn fully, but also greatly reduces harmful gases such as exhaust gas. When the exhaust gas recirculation technology, tail gas catalytic conversion and particle filter device are used, the final exhaust gas can reach the Euro IV standard. The muffler with traditional structure has become a history, and has evolved into a very large exhaust processor with the triple functions of catalytic conversion, particle filtration and noise elimination

engines using alternative fuels, such as liquefied petroleum gas and compressed natural gas, can also significantly reduce the content of CO, CH and NOx in the exhaust. The fuel cell engine, more accurately, should be a generator. The exhaust gas emitted is water mist, which does not contain harmful gas components. It is zero emission, but not zero emission. Large passenger cars abroad have been equipped with hydrogen burning generators as power, and 9 slender high-strength carbon fiber hydrogen tanks are equipped with 43kg hydrogen 4 Multi language random switching, 250KW power, 60~70 passengers, total mass 19000kg, 300km. Due to the high cost at present, it is difficult to build the storage, transportation, sales and filling system of hydrogen, and it is estimated that it will not be put into commercial production and sales in the past five years

in terms of noise reduction, the engine noise is reduced by adopting high-pressure common rail electronic fuel injection technology, improving the cylinder structure, improving the overall rigidity, reducing the maximum speed, and adopting exhaust wheel supercharging intake technology; By improving the fan blade shape and its surface smoothness, the noise of engine accessories is reduced by using electrically controlled and self-adjusting hydraulic or electric drive; By improving the structure of the engine compartment, attaching porous and wool fiber veneers, the functions of sound insulation, sound absorption and heat insulation are achieved; By improving the tread pattern and grooving structure of the tire, improving the rubber formula and vulcanization molding process, the rolling deformation noise of the tire is reduced; Through the streamline of its own shape, the joint gap of the car body surface should be minimized and the arc smooth transition should be increased; Through the sound insulation technology of the car body, the steel pipe cavity of the side frame of the car body is sprayed with wax, and the interlayer between the inner and outer plates is injected with plastic, which has both anti-corrosion and sound insulation functions

the comfort of the bus has reached a new level

-- due to the use of the constant speed cruise electronic control system, the driver only needs to pay attention to the road conditions ahead, turn slightly or step on the brake slightly, instead of shifting gears and stepping on the accelerator pedal

-- due to the use of global positioning system and satellite navigation system, drivers can always know where they are now and which route to take, which can make it easier and faster to reach the destination. In case of an accident, the general control desk will also know where you are and the nearest ambulance

-- due to the use of tachograph, the driving coal capacity has been reduced by nearly 1 billion tons, and the dispatcher can easily check the accurate status of driving

-- the arc layout of the instrument panel makes it convenient to observe the reading of the instrument. The buttons are within reach. The steering, clutch and gear shifting actions are assisted by hydraulic or pneumatic power, ensuring the ease of driving operation

-- the windows are extremely enlarged, and the field of vision is extremely wide. The front windshield is heated by resistance wires, avoiding fog and frost at low temperatures; The windows on both sides are hollow laminated glass, the floor is made of multi-layer fire-retardant plywood, and then paved with fire-retardant soft carpet to ensure the best sound insulation and heat insulation effect

-- there are all kinds of accessories in the car, including stereo, TV, hot and cold drinks

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