2017年宝马在国内推出了中国特供版车型宝马1系三厢版,相较于原版的宝马1系全球化车型,只在国内销售的1系三厢版最大的不同就是基于UKL前驱平台打造。而在时隔两年后,全新一代宝马1系全球化车型也将迈向前驱战略。据悉,新车或将在3月初开幕的日内瓦车展上正式发布,到时有关新车的详细信息将会对外公布。不过各位无需等到新车正式发布,近期网上曝光的大量新车路试谍照以及有关新车的部分信息已经令全新一代宝马1系的真容逐渐浮出水面。
了解宝马S58B30发动机
宝马S58B30发动机将推出高低功率两个版本,低功率版应用在新一代X3 M和X4 M车型之上,最大功率480马力/5600-7200转每分钟,峰值扭矩600牛·米/2600-5500转每分钟。高功率版应用在新一代X3 M和X4 M雷霆版车型之上,最大功率510马力/5950-7200转每分钟,峰值扭矩600牛·米/2600-5500转每分钟。
与B58B30发动机相比,宝马S58B30发动机气缸的内径略大、行程更短。虽然84.0×90.0毫米的气缸规格较前者(82.0×94.6毫米)在容积上下降了5毫升,压缩比也由11.1:1变化为9.3:1,但是S58B30发动机的动力却拥有了质的飞跃,且将红线推迟200转每分钟至7200转每分钟。
宝马S58B30发动机技术亮点
■双涡轮增压系统
这台发动机虽然是直列6缸结构,但是宝马M部门仍为其设计了一套双涡轮增压系统。两个涡轮增压器采用并联布局,每个涡轮机与三个气缸的排气歧管相连,利用三个气缸产生的废气推动涡轮增压对进气进行增压。另外,因为这种结构使排气歧管被分为独立两组,将不同气缸排气的交汇点大大推迟,有利于降低振动。
■3D打印气缸盖
宝马S58B30发动机对气缸盖进行了重新设计,复杂的管路结构和轻量化需求甚至都超过了传统铸造工艺的能力范畴。因此,宝马在制造S58B30发动机气缸盖时引入了3D打印技术,面对超出传统金属铸造技术能力的几何形状和难以实现的最优冷却剂管布线方案,都可以顺利解决。得益于3D打印技术实现的最佳结构,S58B30发动机气缸盖还避免了冗余结构造成的材料浪费,达到了更好的轻量化效果。
■铁离子热喷镀缸壁
从宣传画面中可以看到,宝马S58B30发动机依旧不具备传统的气缸套,显然是延续了B58平台的铁离子热喷镀技术。这项技术是通过电弧喷涂方式在气缸壁表面制造涂层,拥有比“外挂式”气缸套更好的耐磨性和热传导性,而且还避免了单独制造缸套模具的开发成本。
■水冷式中冷器
宝马S58B30发动机采用了更加紧凑的水冷式中冷器为增压后的新鲜空气降温,位置从B58B30发动机的顶端移至了侧面。这种结构相比风冷式中冷器,可以大幅缩减进气道长度,提升动力响应速度。
■350bar燃油喷射系统
宝马S58B30发动机的燃油喷射系统将通过两个燃油泵同时进行加压,使喷射压力达到350bar。全新X5搭载的B58B30发动机虽然也是相同的喷射压力,但是宝马宣称S58B30发动机的燃油喷射系统将拥有更好的燃油分配效率。
■Valvetronic电子气门、Double-VANOS双可变气门正时系统
宝马著名的Valvetronic电子气门和Double-VANOS双可变气门正时系统继续出现在S58B30发动机之上,通过对气门升程的无级调整和点火正时的实时控制,可以更加细腻的控制发动机进气及燃烧状态,达到理想的动力曲线。
■镁合金油底壳
油底壳采用铝镁合金制造,全新的双腔结构可在激烈驾驶时尽量消除惯性作用,使机油稳固在油底壳底部,为润滑系统提供充足的油量。
结语
有关宝马S58B30发动机的信息,目前所知还比较有限,如果想要给出一个最终定论或许还为时过早。但是,作为新一代M车型的心脏,突破500马力的最大功率已经足以达到绝大多数消费者对于高性能车型的预期。在技术层面,这台发动机也做到了与时俱进,比如利用3D打印技术实现了传统工艺无法做出的结构需求。该发动机未来还将搭载到新一代M3、M4等车型之上,届时它们的最终表现和未来不断公布的技术数据,我们也将持续关注。
原创文章,作者:cesifu,如若转载,请注明出处:http://www.cesifu.com/article/14808.html
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