1、1车辆热管理的研究方法和内容2l 热管理系统与整车的集成研究 ，主要通过研究汽车热管理系统 空气侧复杂流动和传热过程机理 ，探讨汽车总布置设计、热管理系统集成方式以及行驶工况等因素对热管理系统性能的影响。在此基础上，从系统工程观点和综合指标出发，妥善解决热管理与汽车结构和总布置设计之间的关系，控制汽车热管理系统空气侧流场结构，避免热风回流，改善冷却风道特性，提高热管理系统的实际运行性能l 试验研究与数值模拟为热管理系统与整车集成研究的基本方法。车辆热管理的研究方法3国外主要的实验结论 通用汽车公司的 Patrick Hoover在实验室中，考虑集成在一起的发动机机体、冷凝器、散热器和风扇密封板
2、等影响，对发动机舱内流动进行试验，分析了冷却风扇与发动机舱流动之间的匹配性能。该研究模拟车速 50km/h，环境温度 49 条件，对散热器工作和不工作时的热管理系统冷却空气流量进行测量和比较。结果表明，散热器在加热条件下的冷却空气流量低于不加热时约 12% 最新的冷却系统发展方向（ VALEO公司 )：1. Nucleate boiling engine cooling: 发动机内部冷却液沸腾冷却系统 (REROM)2. THEMIS system ： 智能化电子冷却系统（电子控制阀控制条件冷却液的温度和流量）3. CoolMaster ：电子水阀 代替传统的 节温器或电子控制阀4. Ulti
3、mateCooling ：http:/www.sae.org/mags/sohe/http:/www.sae.org/mags/aei/41. 电子泵代替机械泵2. 低压循环系统 0.2bar （ 1.503. 适合更高的（高和中等 )发动机负荷4. 汽缸头的温度高 510C5. 循环水量更少 13001400L/H (43005400)REROM 系统There are two coolant architectures for nucleate boiling engine cooling: partially filled coolant architecture: there is c
4、oolant in the cylinder bloc and the cylinder head and all the rest of the coolant circuit remains empty. This coolant architecture was adopted and studied by two car manufacturers (Nissan and BMW). Completely filled coolant architecture: there is coolant in the whole coolant circuit. That means the
5、coolant circuit is practically the same as the conventional engine cooling today. This is our coolant architecture and was adopted and studied by two car manufacturers (Renault and VW). 5REROM 系统6智能化冷却系统 78ULTIMATECOOLING SYSTEM 910Compared to the conventional cooling system and based on Mercedes C
6、class 220CDI, UltimateCooling system exhibits the following results : Packaging reduction in Front End by -10 Liters (-40%), Danner crash repair cost reduction, Green House Gas benefit (750g of R134a 1000 kg of CO), Better WCAC performance (4 to 10 C better if A/C is ON, and 13 to 20 C better if A/C
7、 is OFF) Better engine performances and dynamic response (turbo lag), Mutualization of thermal exchange potential : all heat exchangers being cooled down by the same fluid, A/C, Charge Air and Engine cooling operates by sharing power depending on the vehicle speed conditions, Could supply low temperature coolant to other fluids : fuel cooler, EGR cooler, oil cooler, electronic cooler and electric power-train cooler for HEV, FCEV, Less high cost hoses: A/C, OC, CAC, Cross-line component standardisation : WCAC, WCDS UltimateCooling system 优点
