凡凡在国外网站上看到了一个马自达销售公司的答疑，贴给大家看。
答疑
When you hop in your Mazda3 in the morning and turn it on, does the engine sound louder than normal for about half a minute? Certainly any unfamiliar noises, especially on a fairly new vehicle, can be disconcerting. If it’s what we think it is, though, we think you’ll be pleasantly surprised to learn the answer to the question, “Why is my Mazda3 so loud when it starts?” While a noise can be made by any number of issues, there’s also a good chance this is a normal function of your Mazda that’s actually working to your benefit!
当你坐上马自达3，启动它，发动机要轰轰半分钟？轰轰的声音的确让人很不舒服，特别是当这是一辆新车时。噪声可能是来自多方面的，但也可能是马自达的正常功能。
Let’s start with this question: Have you noticed the louder engine sound at startup in particular on colder days, and not as much during summer or when your car’s been in a temperature-controlled garage? If so, we think we know what’s going on! It’s actually your Mazda3‘s Accelerated Warmup System.
你是否注意到，在冷天发动机启动时声音更大？而在夏天或者车库里，发动起启动时声音没那么大？如果是这样的话，那就是马自达的加速预热系统产生的。
Mazda3 start up noise. What’s the Accelerated Warmup System? While the average engine may take several minutes to warm up in cold temperatures, your SKYACTIV engine is different. Using a higher RMP of about 1500, as well as an advanced combustion process, the catalyst is warmed up quickly, resulting in cleaner emissions. It will slowly become quieter as the accelerated warm-up is completed and the whole thing should take around thirty seconds.
什么是加速预热系统？普通发动机可能需要几分钟才能预热完成，但是创驰蓝天发动机不一样。创驰蓝天发动机使用大约1,500转的转速，结合先进的燃烧过程，使得三元催化器快速预热，从而实现清洁排放。随着加速预热完成，它会渐渐安静下来，整个过程大约需要30秒。
So, do you need to wait for the Accelerated Warmup to complete before you take off? Not at all. Just head out on your way and let your SKYACTIV engine do the work.
那么，出发前是否需要等待预热完成？不需要。出发便是，让发动机自己完成工作。
Now, if you answered “no” to the question of whether this happens on cold days, and it’s not quieting down in about a half a minute, you might be facing another issue. Feel free to bring your car in to us here at our service center so we can take a look for you, and if it’s something else that needs to be addressed we are happy to assist you.
如果半分钟后，还没有安静下来，就是出了其他问题。
结论
- 发动机预热，是为了给三元催化器加热，为了清洁排放
- 声音大，是为了节省预热时间才提高了转速，只需要半分钟（而其他厂家需要几分钟）
- 预热时不用等它，直接开起走
次世代马自达3 - 昂克赛拉
马自达3
