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65年3至4季度由有关单位组成的高原联合试车调查队,在青藏高原地区进行了试验调查工作。青藏高原地形较复杂,空气稀薄、干燥、温差大、冬季严寒。除青藏和川藏公路等主要干线为4级和六级路面外,大部为低级土路。路面海拔高度一般在3000—4000米左右(除东南地区外),高者达5009米以上(如唐古拉山)。因行驶条件恶劣,出现了发动机功率显著降低、冬季起动困难、冷却系散热性能不足、刹车气压不够等问题,兹将试验情况简单汇报如下:
In the third quarter to the fourth quarter of 2012, a plateau joint commissioning investigation team composed of relevant units conducted a pilot survey in the Qinghai-Tibet Plateau. The topography of the Qinghai-Tibet Plateau is more complex, thin air, dry, large temperature difference, winter cold. In addition to the Qinghai-Tibet and Sichuan-Tibet Highway and other main trunk for the 4 and 6 pavement, most of the low-level dirt road. Pavement elevation is generally about 3000-4000 m (except southeast), the highest of more than 5009 meters (such as the Tanggula Mountain). Due to poor driving conditions, there has been a significant reduction in engine power, difficult to start in winter, lack of cooling performance of the cooling system, brake pressure is not enough and so on, the test situation will be briefly reported as follows: