Oh yer never thought of that!
Hybrid tractors
- Thread starter Yorkshire lad
- Start date
- Location
- East Essexshire
An engine makes roundy-roundy motion, which is what you want the wheels to do.
Why convert that into electricity, pass it through a battery, then convert it back into rotation again, with all the losses as you go along?!
Why convert that into electricity, pass it through a battery, then convert it back into rotation again, with all the losses as you go along?!
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Doesn't need to pass through a battery unless you want to run with the engine off. What is the efficiency of converting the power into electric and then back, compared to the losses through a transmission?
holywell farmer
Member
- Location
- holywell, north wales
isn't jd new gear box electric ?
Pheasant Surprise
Member
- Location
- Woodbridge, Suffolk
Ok so a gen set where the engine usually lives. an electric motor for each wheel, one to drive the hyd pump and one sticking out the back for the pto. A fastrac style with mid mount cab and four wheel steer would be how I would imagine it looking.
how hard can it be?
for a start all the complicated drive lines and troublesome gearbox issues etc would be gone.
Want more pulling power? make it modular and just drop a bigger gen set in the chassis and change the wheel motors or bigger pto motor if needed.
how hard can it be?
for a start all the complicated drive lines and troublesome gearbox issues etc would be gone.
Want more pulling power? make it modular and just drop a bigger gen set in the chassis and change the wheel motors or bigger pto motor if needed.
Exfarmer
Member
- Location
- Bury St Edmunds
Diesel direct drive 95%+ efficient
Diesel CVT drive 80% efficient
Diesel electric drive 30% efficient
Which do you want?
All the manufacturers have had working models in the last 50 years
Diesel CVT drive 80% efficient
Diesel electric drive 30% efficient
Which do you want?
All the manufacturers have had working models in the last 50 years
Now I'm no expert on this however it's not exactly direct drive to the wheels is it. how much is lost by the time it's gone through the gearbox and diffs etc?
I'm afraid I suspect your statistics without some references. If diesel electric is so poor, how come so many big dump trucks, mining excavators and the Cat D7e use it? All on the basis of being more efficient?
Everybody knows that 97.2% of all statistics are made up
Cat D7e only 250hp. Apparently saving lots of fuel for those who use it.
On the other hand..... I've just been looking for other kit as I remember Volvo launching an L220 loader as a hybrid. Google says it was launched as a concept in 2008. Dropped in 2013 as it cost too much and didn't really compete against new gearbox technologies and engines. So it could be a few years yet before there are any breakthroughs on a large scale.
Either way, when it makes financial sense, it will happen.
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A retired gentleman in my village who worked for a very large oil company and travelled the world extensively! Told me one day when asked this question about oil volume, he said imagine all of the oil ever used up to now!! And double that quantity!!! That I the quantity that is known to be left!? Biggest problem is the cost of getting it out the ground!!
clbarclay
Member
- Location
- Worcestershire
Alas I didn't keep a copy of the full report to have the references for data we used. From memory that figure for a CVT like a Vario is close, they vary around that, but its not constant depending how much power is transmitted mechanically and how much hydraulically.I'm afraid I suspect your statistics without some references. If diesel electric is so poor, how come so many big dump trucks, mining excavators and the Cat D7e use it? All on the basis of being more efficient?
Everybody knows that 97.2% of all statistics are made up
It doesn't surprise me that electric transmissions could be only 30% efficient. Get the design wrong and eletrics can be rediculously inefficient. The system we looked at had a static efficiency roughly the same as a mechanical transmission, but with the dynamic efficency (from keeping engine at optimum revs) of a CVT.
In the case of the D7, they also advertise them as more monoverable for being able to drive the tracks in different directions at the same time.
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