Toyota to use Atkinson cycle in non-hybrids: 10% efficiency boost, "no power loss"
Reports today say Toyota's going to start using Atkinson cycle engines in 14 non-hybrid models. They're starting in the Japanese market with 1.0L and 1.3L engines.
Quote:
|
Ha: first comment posted under that article...
Quote:
|
Quote:
I'm pretty sure point #2 and #3 are supposed to be one though. They're using cooled EGR to not overheat the intake air. They do this by running it through an EGR cooler like a diesel has (and the latest gen Prius' engines). They need to cool the EGR because putting too much hot EGR into the intake mixture will cause knock instead of help prevent it, which is one of the advantages of EGR to begin with. |
May be. But then what's the third anti-knock strategy? (They mention 3.)
|
I dunno, but having a water jacket around the cylinder isn't exactly new technology.
|
I wonder if either this 1.3L or (less likely) the 1.0L are going to be featured in some U.S.-spec car. At least in the Yaris they seem to be a good option, but the 1.3L could also be reasonable in the Corolla...
|
Depends on the power output! 1.3 in the U.S. Yaris, possibly. Doubtful in the Corolla.
|
The Corolla is already available with a 1.3L engines in some markets. In Portugal it's currently the only gasser available.
|
I think it has to do with coolant flow.
Quote:
|
There is NO WAY an Atkinson-cycle engine, of exactly the same dimensions, will produce the SAME horsepower...when TORQUE is "shifted" toward lower RPMS, Horsepower falls-off drastically, since HP is a direct function of RPM. Yes, the higher CR helps, but at what cost to FUEL "knock" sensitivities?
Toyota marketing has been listening to Detroit Marketing too much! |
Quote:
|
I'm wondering if direct injection hasn't been used on the Toyota atkinson engines for a reason. They've been using direct injection on the Yaris since before the 3rd gen Prius came out. My theory on this is that the port injection allows more time for the fuel to vaporize and the benefits of that outweigh the benefits and costs of direct injection. Due to the way Toyota does their atkinson cycle, part of the intake charge is pumped back out of the intake valve during the compression stroke. This allows more time for the fuel to vaporize and to cool the intake charge thus producing an anti-knock benefit. If they went to direct injection, they would loose some of this effect. Anyway, thats just my theory on it.
|
Quote:
|
38%
Toyota also has engines with up to 42% thermal efficiency,which rivals that of a diesel,minus the extra energy of the diesel fuel itself of course.
|
All times are GMT -4. The time now is 11:53 PM. |
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com