| Since the reform and opening up, China’s social economy gets great progress, thehighway traffic network constant repair, road freight mode has become one of themost important way of logistics in china. The advantages of heavy commercialvehicles in highway transportation costs and benefits, promote the industry productstructure istoward the direction of large tonnage, the trend of multi axis, multi Trailerdevelopment more and more obvious, the carrying capacity is taken on the highwayfreight in the larger, which makes heavy goods vehicle increases year by year in therecent market sales.At present our country commercial card industry mainly carry out theinternational exchanges and cooperation through, the introduction of foreign advancedtechnology, independent research and development of domestic, will beChina’s commercial truck upgrade to advanced technology, strong comfort, highreliability of the high-end heavy truck, and constantly with advanced technology ofdeveloped country standards.Research and development, the domestic commercialvehicle enterprise production technology gap in reduced year by year compared withforeign,rapid promotion of commercial trucks, environmental protection, energysaving, comfort, reliability control of these properties, in lightweight and securityalso proceed with determination.And domestic commercial truck price far belowthe price of imported vehicles.As China’s national economic and social development of the basic, guidingindustry and service industry, highway transportation is our country become one ofthe key development strategy of power, power. The continuous progress of thedevelopment of social economy and transportation industry, also caused the roadtraffic safety state in China become more and more serious. Since80time, roadtransportation accident in China is rising year by year, the road trafficaccident mortality rate is also high and still increasing at all the year round,theamplitude of8%a year. At present, the traffic accident deaths in China’s shocking,has ranked the first in the world. The traffic accident has become the security ofpeople’s life and property damage,"public enemy number one", the securitysituation of road transportation in our country is not optimistic[1]. By natural conditions, China is a mountainous country, mountains andplateaus widely many. Mountainous land area of total land area in China69%.Because of the landform characteristics of mountain, the whole road grade islow, mountain road is generally more narrow, winding, and steep slopes, the terrain ismore complex, at the same time, vision is not very open. Therefore, the highwaytransportation risk and difficulty is big, easy to produce road transportationaccident. Especially in the continuous down hillroad, very high heat load ofautomobile brake system, the brake system of the heat can not be timely released tothe surrounding environment,temperature greatly brake wheel hub and brakeshoe rises, high temperature will cause brake failure. The vehicle driving on themountain is very dangerous. Therefore, in the event of gradient bigger rollingmountain traffic accident frequency is higher than the other road. Foreign countries isalready in these aspects of attention and the research of[2]With the development of automotive technology, to improve the safety ofthe commercial vehicle road driving, many vehicles are fitted with auxiliary brakingsystem. Our country for auxiliary braking device requirements issued in December31,2011, the Ministry of industry and information technology combined with Ministry ofPublic Security issued the "notice on further improving the safety and technicalperformance of large and medium-sized passenger car vehicle" notice "to strengthenthe management and registration management work"."Notice" clearly putforward,"commander than highway bus, tourist bus,9meters of dangerousgoods transport vehicles, the total mass of more than12tons of freight car beequipped with retarder or other auxiliary braking device", and implementedin September1,2012. Analysis shows that, the transport of dangerousgoods vehicle in the future is not installed, such as engine brake retarder andother auxiliary braking device and more than12tons more than the truck will limit onthe road. More importantly, the Ministry and the Ministry of public security veryseriously, strictly implement the new project requirements related to 《GB12676》 requirement.《GB7258》 in2011and revised requirements, namely "the safe operation of motorvehicles technical conditions" in the premise of version2004, an increase ofcommander is greater than9meters of the bus, the total quality of not less thanIV 12000kg of the truck, dangerous goods transport vehicles should be equippedwith all retarder or other auxiliary braking device" and "auxiliary braking deviceperformance requirements should bring the car through《GB12676》provisions ofthe type II or II type Atest provision[3].Therefore, nature, economy, handling stability and security, it is extremelyimportant to power commercial truck driving on mountain roads, the domestic andforeign research of commercial vehicle enterprises played a role, but alsoto test commercial vehicles running on the highway in mountain area of the moredemanding requirements. Test method for driving the traditional commercialvehicle mountain has seriously lags behind, unable to have the performance, specificguidance for commercial vehicle and auxiliary braking system reliability test. Thisarticle from the commercial vehicle auxiliary braking system structure areanalyzed, and combined with the actual vehicle driving cycle in mountainous area, theintroduction of foreign advanced test... |
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