车用LNG行情受国三柴油车“禁令”提振

<正>工信部近日公告,定于2014年12月31日废止适用于国家第三阶段汽车排放标准(简称国三)柴油车产品《公告》,2015年1月1日起国三柴油车产品将不得销售。受去年7月以来全国范围内非居民天然气提价影响,LNG价格整体上扬,导致车用LNG的经济性有所下降。业内人士认为,国三柴油车"禁令"将加速柴油升级换代,一定程度上使车用LNG的经济性和替代效益再次凸显。不过,受天然气价格上涨预期的影响,短期内车用LNG的发展仍需政策扶持。

The Steering Returnability Trouble Shooting of One Car

When releasing the steering wheel after a large-angle steering（steering back 90°from the limit position to the limit position） in the low-speed,the steering wheel did not return automatically,but turned to the limit position,which will affect the evaluation of the vehicle performance.To solve this problem,first we tested the suspension K C characteristics,and found the steering ackerman,caster angel and mechanical trail are relatively small;through theoretical analysis,we found the mechanical trail and steering ackerman have significant impact on the steering returnability,and the small steering ackerman can cause the steering wheel to the limit position;By an equivalent test,we verified the improved steering ackerman can avoid the phenomenon of turning to the limit position.One solution was made by CAE analysis,and through the real car test,we obtained the good result.