The OBD I have doesnt record RPM for some reason. I wish to calculate Emission factors (g/kWh) from measured vehicular emissions (g/s). So, I am hoping someone would help me out with average engine utilization for both cars (GVW 3500 Kg).
When you measure vehicular emissions (according to an emission standard), your car engine goes through a defined load cycle. You may derive the kW or kWh through the definition of the load cycle.
There is an emission database for several European countries
http://www.hbefa.net/e/index.html
This database (there is a simplified online form) gives you emissions and fuel consumption per vehicle class in various levels of detail (per vehicle type, road type, year etc.).
Vladislav Sveshchinsky
most of the current generation economy cars (GVW
Ingo Riess Thank you. This is great, I can definitely use this for comparative study. But, in this situation I doubt this data will take me anywhere. Because, vehicles in EU are currently under EURO V & EURO VI standards. Whereas, in India we are implementing BS IV (EURO IV equi.). Also, EURO VI vehicles will be fitted with more advanced control technologies which actually utilizes engine much more than EURO IV vehicles, due to increased back pressure.
Thank you again for your help.
Vladislav Sveshchinsky
Your understanding about back pressure is correct. I am talking about back pressure in the exhaust system (to expel exhaust gases from the vehicle exhaust system).
Let me ask a question to know your demand: Which types of unity you expect to receive your answer? e.g. miles, kwh, h, etc
@carlos Mussato I am looking for an answer in kwh and percentage
So let´s try to get first anwers.
If you do not have RPM records so you can consider an average of 3,000 RPM for Otto Cycle and 2,000 RPM for Diesel cycle. With these values you can estimate the PERCENTAGE of use for each engine. So for first one you have 54% (3000/5500) and for second one you have 57% (2000/3500). Note that the denominator of equation means the maximum power of vehicle and this vary acc. model.
Now to calculate the g/Kwh I advice you consult Bosch handbook or vehicle manual to know the emissions rate then you can adjust the calculation with data above and considering the engine power curve for specific vehicle you want to consider.