Hybrid Thermal Efficiency

[ny551]

Hello,

I'm trying to understand how to calculate Thermal efficiency of a car with regular Otto cycle and with Hybrid Parallel system.

I know that Thermal Efficiency = Wout/Qin.

If I have the fuel consumption data, RPM and Torque,
How can I calculate Qin?

As for the hybrid, is it enough to derive that the thermal efficiency in the hybrid system is : (Wout(without electric motor) + P (electric motor)) / Qin

?

I hope you could help me,
Yair.

[thorpie]

The BSFC chart thread (post 'em if you got 'em) is a good start
Formula for efficiency from BSFC is Efficiency = 79.3/BSFC (based on petrol energy density of 46.5 mj/kg.)

g/kwh	Efficiency
200	39.6%
210	37.8%
220	36.0%
230	34.5%
240	33.0%
250	31.7%
260	30.5%
270	29.4%
280	28.3%
290	27.3%
300	26.4%
310	25.6%
320	24.8%
330	24.0%
340	23.3%
350	22.7%
360	22.0%
370	21.4%
380	20.9%
390	20.3%
400	19.8%
410	19.3%
420	18.9%
430	18.4%
440	18.0%
450	17.6%
460	17.2%
470	16.9%
480	16.5%
490	16.2%
500	15.9%

[mopo3]

just encase you are talking about the prius, it has an Atkinson cycle engine which just means that the expansion volume is greater than the compression. otto cycle is your standard gas engine with the same compression and expansion.