h a l f b a k e r yA dish best served not.
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You rent a trailer and attach it to your
car.
You don't have a trailer brake system in
your car, but the trailer still brakes when
you brake, but even better, accellerates
itself when you do.
Trailers currently use 3 main forms of
braking: electric-friction. parasitic (all
breaking
done by towing vehicle) or the
U-
Haul small trailer system were the tongue
acts as a plunger for a master cylinder on
the trailer.
I suggest combining a hydraulic
regenerative system like the F350 Tonka
with an sliding tongue like the U-Haul
trailer to control braking or accelleration
assist. When the car slows down, the
trailer will slide forward on the tongue,
activating the valves so the a pump/
motor on the trailer axel (or pump/
motors on
the wheels) move hydraulic fluid from a
low to high pressure accumilator to
supply
braking.
When the car speeds up the trailer will
slide backward on the tongue, activating
other
valving to release fluid from the high
pressure accumulater to drive the pump/
motor to assist in accelleration of the
trailer.
[Modification] Instead of passive tongue
activation, the valves could be actively
engaged so the most of braking and
accelleration for the car and trailer could
be supplied by the trailer. This would
require larger accumulators. (and might
tend to jacknife)
[Caveat] Tongue valve activatior would be
spring loaded toward center and would
require some mechanism to eliminate
occellation between braking and
accelleration.
F350 Tonka
http://www.designne...&articleID=CA220671
diagram of hydralic regenerative braking [SimpleTom, Jul 11 2005]
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Annotation:
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I like it, and I'm bunning it, but: |
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This would add a lot of weight, cost and complexity to what usually amounts to a simple platform with wheels. |
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Unless the towing vehicle is extraordinarily light (and who tows with those?) or has a very long hitch-to-axle distance, I think the risk of jackknifing should be pretty slim. In 20+ years of driving, several as a delivery driver, I've only seen one jackknife, and that was braking hard on a curve with an enormous, long load. |
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This would be a brilliant system to use in combination with the F350 Tonka. Starting up, they could pull away from a light with no IC engine contribution, and save enormous wear on brakes. |
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...you said "the trailer will slide forward on the tongue" twice. |
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Electrical activation of the valves would be better than purely mechanical. |
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Advantages: Simpler/less costly hookup for long distances from tongue to pump/motor. |
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More compatible with electric brakes. |
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Response can be inverted when towing vehicle is in reverse (via signal on back-up lights). |
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