Pneumatic pusher and brake regeneration

[backpacker3]

Originally Posted by CapriRacer

Just keep in mind that you would be changing the brake bias no matter what system you use, and that could result in a dangerous skid. be careful and think this all the way through.

This ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Read that very carefully as well as my other post and consider if there will actually be any gains worth endangering both yourself and those around you. Is a few mpg really worth someone else being seriously injured or even killed in a car accident.

If you decide that you want to continue and can do so in a way that will not endanger the lives and well being of others I heartily suggest you do tons of testing off public roads and in an environment that is as controlled as possible in case something goes wrong.

[CapriRacer]

Originally Posted by backpacker3

This ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Read that very carefully as well as my other post and consider if there will actually be any gains worth endangering both yourself and those around you. Is a few mpg really worth someone else being seriously injured or even killed in a car accident.

If you decide that you want to continue and can do so in a way that will not endanger the lives and well being of others I heartily suggest you do tons of testing off public roads and in an environment that is as controlled as possible in case something goes wrong.

I note with great interest that Nico Rosberg detailed the problems he had in the Canadian Gran Prix: The electronics that make the change in brake bias undetectable failed. He could not get a good handle on the brake bias, so his braking was severely hurt. It took Hamilton out of the race.

[backpacker3]

Good example. Hopefully the OP will do plenty of testing before he ever takes it on the road.

[Frank Lee]

Drama queens. The street isn't racing, unless your driving is on the edge already.

[Cobb]

Ive toyed with the idea of getting a hydrolic "motor" from northern tool and mount it up under the hood as an accessory with electric clutch. Then use a gas storage tank with a bladder for the oil. So it would work similar to the epa ups truck where it recharged at idle and braking with the engine spinning, then when you need to accelerate you release the fluid through the motor to help spin the engine.

Plan B maybe to use the PTO of a truck for this vary idea?

[backpacker3]

Originally Posted by Frank Lee

Drama queens. The street isn't racing, unless your driving is on the edge already.

No one said it was racing just that a similar setup in a race car that failed caused some problems just like the setup being proposed is potentially very dangerous.

[Frank Lee]

Run it like a Jake Brake- independent of the regular brakes. Truckers have learned how to Jake Brake safely so I don't see it as an insurmountable issue.

And... I didn't say it was racing either. Racers are on the edge of the performance envelope. I'd hope that outside of emergencies, street drivers aren't.

[backpacker3]

A jake brake is entirely different from what the OP was describing. He want to drop another wheel down whenever the brakes are activated therefore changing the brake bias and also is a good way to start a spin or skid

[user removed]

The concept is good but I would not try it with compressed gas unless you use hydraulic fluid to compress the gas in an accumulator.

It's called hydraulic launch assist which captures enrgy lost in intentional deceleration and reapplies that energy to provide acceleration in the next cycle. The concept is at least a decade old, possibly much older.

In any FWD vehicle the rear axle would be the location of the launch assist system. Using it would be like stopping your car with the emergency brake, but you would be recovering energy for future acceleration. The system could be incorporated into the vehicle and integrated into the ABS braking system, so operation would be seamless. Only in relatively hard emergency type stops would the friction brakes be used.

I remember a member on Clean MPG forums who did the 5th wheel configuration on a first gen Insight, using the extra wheel to generate additional electrical energy for reapplication. Most gas-electric hybrids can not recuperate any more than one third of the energy in regeneration, while the hydraulic configurations developed 10 years ago were at 78%, using a bent axes pump that was spinning at prop shaft speeds which forced the pump to sping at 3.5 times the speed of the wheels. The solution was to move the drive pump to the wheels where rotational speeds seldom exceed 1000 RPM and pump efficiencies easily stay above 90%, compared to 75% at speeds above 3000 RPM.

regards
Mech

[Frank Lee]

Originally Posted by backpacker3

A jake brake is entirely different from what the OP was describing. He want to drop another wheel down whenever the brakes are activated therefore changing the brake bias and also is a good way to start a spin or skid

Seriously- you aren't picking up what I'm putting down AT ALL.