Showing posts with label kw. Show all posts
Showing posts with label kw. Show all posts

2017/12/09

New charts in Hybrid Reporter

The RPM Scatter chart shows RPM values while driving at a given speed.
Note that, given our eCVT transmission, there's no fixed relationship between engine speed and vehicle speed.



The Power Map chart has been revised to give more information: beside giving the power value for each RPM of the petrol engine with a dot proportional to data accuracy, it also plots collected values range and standard deviation.
This provides a more accurate view of the collected data.



The Average Power chart plots power required to keep a given speed.
This is total power, coming from the petrol engine and HV battery.
Values are collected only when a constant speed is maintained long enough to have a consistent reading, so a trip with many different speeds may not gather enough data to plot.
Since required energy is heavily influenced by road slope, you should drive on a plain road to have a correct reading.



The Instant BSFC/Fuel Consumption Chart combines fuel efficiency with burning efficiency, giving an unprecedented insight view of engine workings.
Instant fuel consumption value is drawn using the BSFC color scale.
You can now see how efficiently you are burning the fuel needed to achieve a specific mileage.
The best desirable condition is a short cyan bar.

2017/11/26

Brake Specific Fuel Consumption

"Brake specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft, power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output.
...
Commonly BSFC is expressed in units of grams per kilowatt-hour (g/(kW·h))."- Wikipedia

Hybrid Assistant shows BSFC in the Engine Power Meter using a color scale reflecting efficiency:
Cyan - Best efficiency range (220 g/kWh)
Yellow - High efficiency range (230 g/kWh)
Orange - Medium efficiency range (240 g/kWh)
Red - Low efficiency range (> 240 g/kWh)

Actual thresholds vary with engine type, according to official Toyota documents


Example chart from a Toyota Yaris


2016/07/17

kW/km/h

The new version will add a new statistic to the report.
For each speed value, kilowatts required to maintain that speed are reported.
Please note that, to avoid transitories, only when a given speed is maintained steady for at least 5 seconds, the kW value is considered valid; so some speeds may not be present in the report. This is normal and expected in most cases.
Please note that not all trips are well suited to produce correct values: uphills and downhills will provide readings affected by the additional power required to climb, or the regeneration effect while going down.
If you want to estimate power required for moving your car, choose a flat road and use cruise control to maintain a constant speed.