九代雅阁马力机测试（轮上功率、CVT效率）
偶然在国外网站上看到老外测试的结果，转发过来，希望可以消除大家对于CVT的一些疑虑。
先说结论：
1、测试车型是2013 Accord Sport CVT，发动机、变速箱和国内2.4L车型是基本一致的（轮毂是18寸）。
2、因为CVT变速箱的原因，马力、扭矩与转速的对应关系和常见的MT、AT车型不同。
3、峰值功率是在D档下出现的，161.85hp，换算后CVT的效率在86%左右（可能是发动机的标称功率偏低）。
4、九代雅阁的CVT的确是模拟7速的，仪表盘有显示。
5、D档的加速性能反而比S档稍快（D档转速跳跃不大，S档是模拟AT）。
6、18寸的轮毂加轮胎太重，如果是17寸的，性能应该更好。
如有不准确之处，请指正！
原文地址（需翻墙）：http://www.vtec.net/articles/view-article?article_id=1109224&page_number=1
原文如下：
Author: Jeff Palmer
Categories: Dyno Testing, Accord
Create Date: November 06, 2012 07:14
Last Update: November 08, 2012 16:50
2013 Accord Sport CVT
Having sampled many flavors of pre-production Accords at a press event in August, we were anxious to see what Honda"s new Earth Dreams i-VTEC 4-cylinder would do on a chassis dyno. A few weeks ago, we managed to get our hands on a production version of Honda"s brand-new 2013 Accord Sport CVT, so we promptly took it over our normal testing facility (Dynolab in Marietta, GA) and strapped the car to the rollers.
We were hoping to sample the 6MT version of this car, but they are not yet available in the press fleet for loan. Thus, the dyno charts you will see here are a little bit different than what you might be accustomed to seeing. For one thing, the fact that this car is a CVT means that plotting HP and Torque curves against an RPM-based x-axis just doesn"t work very well, so that"s why we have split up these charts. Also, we made a few passes in the simulated 7-speed "Sport" mode in an attempt to emulate what an in-gear pass on a traditional manual transmission car would look like, but even in the "fixed" gear runs there was a little bit of variable gear ratio action going on. See the charts and notes below.
CVT Mode Dyno Plots
Here are the horsepower and torque curves plotted against roller speed. In this plot the Accord was tested in the standard D mode.
In this plot, we show the horsepower vs the roller speed, but also plot the rpm curve on the secondary y axis to show how the revs build and hold.
This is just like the above chart, except this shows the torque curve along with the rpm curve.
This is an interesting plot which shows the CVT"s effective gear ratio (expressed as rpms/mph) along with the horsepower curve
"Fixed gear" S Mode Dyno Plots
This is the horsepower and torque curves vs rpm in "S" mode with it locked into 3rd gear. We discovered that the transmission automatically upshifts in this mode as it reaches the rev limiter
This plot shows horsepower in the S3 mode alongside the calculated gear ratio. You can see that even in the stepped gear modes, there is some variation in the effective gear ratio
This is just like the above chart, except this shows the torque curve along with the effective gear ratio. The scale for the gear ratio axis is more exaggerated in this plot.
This plot compares output in "D" mode vs the fixed gear "S" mode. As you can see, maximum average power is clearly delivered in CVT mode. Ignore the big blip at the end of the S-mode plot (red). That"s where the transmission upshifted
As you can see from the charts on page 1, peak performance is delivered from the pure CVT mode. Interestingly, Honda seems to have changed the operating characteristics of the CVT in S mode. During our limited time driving pre-production Accord models with the CVT, we found that the S-mode held selected gears until an upshift was commanded. In this production Accord, the transmission will hold the selected gear until you reach the redline and then it will automatically upshift. During our 0-60 and 1/4mile testing the stepped-shift S mode FELT faster and more pleasing to the ear (due to the quickly changing engine note vs the droning of the engine sitting on 6500rpms), but unsurprisingly, it was in fact a few ticks slower to 60 and through the 1/4 mile. Our best 0-60 time in CVT mode was 7.6 seconds, while the "7-speed" stepped S mode only delivered 8.0. The 1/4 mile time in CVT mode was 15.8@92mph while the "7-speed" stepped S mode trailed slightly at 16.0@91mph.
One more quick note: we weighed the Accord Sport"s handsome 18" wheels and they came in at a hefty 55lbs. That"s something that will certainly dull acceleration a little bit and also show up on these dyno plots. Lighter weight wheels (such as the 17s found on the EX model) would likely reflect slightly better horsepower and torque numbers on the dyno charts as well as gain perhaps another tenth or two in the acceleration figures.