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Old 11-20-2014, 09:48 AM   #41 (permalink)
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Nope. Lawn mower engines aren't economical in terms of fuel used to power produced. Then you add up the charging conversion losses, and this sort of system makes no sense. Even BMW's range extender only offers very poor economy on petrol. As an emergency back up it's OK, but it won't do 75MPG without recharging the batteries first at home.

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Old 11-20-2014, 10:22 AM   #42 (permalink)
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Quote:
Originally Posted by oldtamiyaphile View Post
Nope. Lawn mower engines aren't economical in terms of fuel used to power produced. Then you add up the charging conversion losses, and this sort of system makes no sense. Even BMW's range extender only offers very poor economy on petrol. As an emergency back up it's OK, but it won't do 75MPG without recharging the batteries first at home.
Even with a very poor engine many cars could get 75mpg if tuned to be able to go exactly 25mph max speed.
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Old 11-20-2014, 11:02 AM   #43 (permalink)
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Quote:
Originally Posted by a8ksh4 View Post
I've been mulling over ideas for how the average DIY'er could convert a RWD vehicle to hybrid w/o too much trouble.

It shouldn't be too difficult to put something between the transmission and front of the driveline, be it a motor, pump, etc. that would recover braking energy.

* Oil pump and pressure tank
* DC generator/motor & batteries
* Flywheel (maybe using a hybrid car cvt transmission to engage/for gearing)
* Big frikin coil spring that winds up

Has anyone on here done an oil pressure/pump hybrid, like what UPS/Fedex were starting to do with some of their trucks a couple years ago?
Hydraulic Launch Assist - Wikipedia, the free encyclopedia

To the OP, sorry I did not follow this thread more closely. Hydraulic pump motor mounted to the differential. Charge the accumulater when you need to slow down, reuse that energy for future acceleration.

US 7677208, my patend for adrive that would replace the wheel-hub assembly and directly drive the wheel, eleminating the differential.
regen efficiency three times an electric system efficiency, above 83% wheel to wheel.


http://www.google.com/patents/US7677208
regards
mech

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Old 11-20-2014, 01:04 PM   #44 (permalink)
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Quote:
Originally Posted by oldtamiyaphile View Post
Nope. Lawn mower engines aren't economical in terms of fuel used to power produced. Then you add up the charging conversion losses, and this sort of system makes no sense. Even BMW's range extender only offers very poor economy on petrol. As an emergency back up it's OK, but it won't do 75MPG without recharging the batteries first at home.
U don't need much power, just enough to turn the one generator, and the generator makes enough electricity to run the motor, and how long can a 5hp engine run on 1gal of gas? FOREVER, (nearly anyway) why would this not work?

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