Argonne Labs explains 40.3 MPG and 43.0 MPG

Looking for Jetta TDI cheat data, I visited:

Source: Downloadable Dynamometer Database | Argonne National Laboratory

"This data is from the Downloadable Dynamometer Database and was generated at the Advanced Powertrain Research Facility (APRF) at Argonne National Laboratory under the funding and guidance of the U.S. Department of Energy (DOE)"

There I found a detailed, dyno log for 2010 Prius following US06, the 'Clarkson' protocol:

	pass	MPG	mph
1	1	40.3 MPG	42.5 mph
2	2	43.0 MPG	46.7 mph

I will post more data in the next day or so. But it appears we have one of the five EPA test benchmarks that provide similar data to what our more vocal mileage complainers report.

It also gives insights to what miniVCI needs to record so we can actually diagnose what the heck is going on:

	US06 metric	miniVCI	required
1	Timestamp [sec]	recorded data	required
2	Dyno Speed [mph]	vehicle speed	required
3	Dyno Tractive Effort [N]	TBD	optional
4	Cell Temp [C]	outside air temp	required for drag calculations
5	Cell RH[%]	not available	optional
6	Phase #	not required: EPA specific protocol	not applicable
7	Engine Speed [rpm]	engine rpm	required
8	HV Battery Voltage [V]	HV Voltage (*)	optional
9	HV Battery Current [A	HV Amps (*)	optional
10	Engine Coolant Temp [deg C]	ICE temp	required
11	Engine Oil Temp [deg C]	not available	not applicable
12	Battery SOC[%]	SOC% (*)	optional
13	Fuel flow from bench modal [cc/s]	calculated from MAF	required

* - some miniVCI metrics are specific to different display modes

These metrics identify what other data recording systems need to meet.

Bob Wilson

 

Sorry, that was my mistake which I correct this evening. The US06 testing consists of:

1. A complete cycle, 600 seconds over 8.02 miles, brings the car to operating temperature. This data is NOT used in the final MPG calculation.
2. A 100 second pause, effectively in park. By mistake, I used most of this pause in the mph calculation.
   
3. Second complete cycle, 600 seconds over 8.02 miles for the MPG measurement. This data is used for the final MPG calculation. My summary here also used about 10 seconds of the pause and that was also a mistake.

The 'mph' should be identical for the warm-up pass as well as the final pass. Totally my error.

Bob Wilson