Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hybrid

Re: Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hy

A gram of petrol contains about 0.0116 kwh of energy, or about 86 grams per kwh. So E.g, if the SFC is 225 grams/kwh then the efficiency is 86/225 = .38

 

Re: Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hy

Pakitt,
It is very worthwhile to differentiate PEAK SFC and AVERAGE SFC. A diesel may indeed hit 200 grams SFC on the highway at 92.373 kph, but increase to 350 in city driving.

IF, (and this is a big IF) the improvements in SFC of 10-15% in Toyota engines are an AVERAGE improvement of the entire drive cycle then it is nothing to sneeze at. FWIW I think most manufacturers will achieve similar gains in PEAK SFC, since they are all using direct injection to get there. I'm more interested in reliable DI which has been elusive.

DI was supposed to make the hybrid drivetrain redundant by solving the partial power problem. Guess not.

 

Re: Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hy

How much does a new traction battery cost now ?
Toyota has been promising the price will be coming down rapidly. Is it ?

 

Re: Toyota targeting thermal efficiency of more than 45% for next-generation gasoline engines for hy

Interesting article for an ICE geek. The long stroke does mean a slower responding piston and lower revving engine. Turbocharging is also an interesting twist, but historically turbochargers are high maintenance items.
quote: Concept 1 is a cooled EGR stoichiometric spark-ignited direct-injection concept, featuring a long stroke design (stroke/bore=1.5) and cooled EGR with an EGR ratio of more than 30%. ...
Concept 2 is a turbocharged lean burn concept,

How all this is relevant to GM and clutches is beyond me.