Ok for a while now i was wondering about converting my car to either ev,hyd,or pneumatic. I think i get the concept of how hydraulics work but if any one can shed some light on this it would be great!! Ok my plan... my car has a 4wd 7500rpm redline 290hp turbo 4cylinder gas engine known as a mitsubishi evolution. i want to make the ultimate car. what i want to do is eliminate the tranny,all other drive train and hardware, and in replacement put four hydraulic motors. one on each wheel with a small axle connecting it to the stock brake assembly and wheel. i want a hydrostatic pump connected to the engine thru a 2.5-1 gear ratio. i was thinking about putting a 25 gallon resivior in the trunk and one 5 gallon accumulator in the hollow space where the stock drive shaft runs. Im pretty good with electronics so im thinking about having solenoids driven by my laptop to controll the hyd motor's solenoids as well as a "launch controll" accumulator system where power is cut at the wheels and diverted into charging the accumulator for a "launch".I was also thinking about gears...having servos controll the hydrostatic pump for the different displacements ie gears. Also i am in the procces of designing my own traction controll system that will match each wheels speed for slipage and also to switch between 2wd and 4wd at the push of a button. Also im thinking about having sesnors on the steering output that will speed up or slow down the wheels that are turning. Also i know that hydraulics get very hot so i was thinking about geting 2 oil coolers and mount them in the front bumper with a small coolant pump circulating it from the resivior. My goals for this car is a top speed of 120mph but with extreme acceleration do to the directly driving the wheels by hyd motors at around 1900rpm max!! Well thats pretty much it but im constantly designing more stuff for it. PLEASE HELP ASAP

Humnnn, try innas.com. Their site will give you good idea about hydraulic hybrid cars. Much of the hydraulic hybrid vehicles are on trucks like UPS where more energy recuperations are better due to frequent stopping(energy recovery during braking).

I like the innas new "floating cups" pumps, motors and hydraulic transformer principles but I don't know whether the final design is done.

Try also the "valentine" hydraulic hybrid cars website. It's a 100+ mpg car!!!

thanks for responding maglub. i checked out that innas.com site and it was pretty cool. for me im not going for best mpg or economy. i just want a car that will literaly rip my arms out of there sockets!!! lol. i just dont know if hydraulics the way to go.....

Yes, it is possible but "painfull" from
the budget and design cost.
Have a look at bthe simplified curcuit.

FOUR-WHEEL.pdf (190 KB, 35 downloads)

I have been thinking about this for a while and have this thought.

Conventional transmission is independant of temperatures and is quick to act in all conditions, this isn't the same with hydraulics. Wouldn't we have problems driving a hydraulic car in winter?

Hello,
i think that you probably can do it, but you are going to need the hydrostatic pump and one or two variable displacement motors to be able to reach that speed. But let me ask you something, why hydrostatic transmissions are only implemented in low speed vehicles ( off-road equipment)?

Regards,

KamilRhu
PD: Interesting article about Hydraulic Hybrids