Thread: Hand Throttle on MY12 Defender?

This is whats commonly known as a Missile Switch..

Missile Switch Protective Cover - Jaycar Electronics

What I want to know though, what is it your reffering to as a "pot"?

Pot is short for potentiometer, a variable resistor, a rheostat (very old high current version).
Typical use is volume/tone controls back in the days when you had a rotary dial to adjust them or in a vehicle the dash light dimmer.
In a 'fly by wire' system the obvious way to signal from the accelerator pedal to the ECU? would be with a variable resistor. Depending on its configuration it should be relatively simple to have a second dash mounted 'pot' that emulates the original.
For safety reasons this could be connected via an operated relays contacts with the relay configured to disconnect on a signal from the brake pedal switch.(latched relay). Could be done electronically but I'm old and think in terms of relays.

Deano

I seen this and thought the same thing. Why couldn’t they incorporate a hand throttle arrangement with this cruise control?
http://nakatanenga-tours.de/shop/article_TEMPDEFTD4/Tempomat-E-Cruise-II-f%C3%BCr-Land-Rover-Defender-TD4-2.4.html'shop_param=cid%3D24%26aid%3DTEMPDEFTD4%26
The interface with the fly-by-wire system is there and so are all the fail safes, so why not add a ‘hand throttle’ to the system?
By the by, it is a bit on the expensive side and why do they fit it on the Left hand side of the steering column? Why not the Right side, it’s less congested.

Surely something could be changed to allow electronic cruise to work at low speeds, maybe 2 systems would be needs, 1 calibrated fro offroad and one for on, but then things get a bit expensive and complicated. But i know why you would have it, on mums car which is a td5 manual you get the lurching offroad in low range when it idles, one of the only reasons i prefer my automatic, but then it sucks on descents.

Cheers
Will

Don't forget that the anti-stall will work for low speed crawling on the TDCi (& TD5).

M

Thanks Deano for the info,, but it all seems like more electrickery for me,,, I just want to up the revs when I'm winching or jump starting someone, or sometimes when your going up a steep incline, you just want a few more revs, (keeping it nice and smooth) to get up.
I think if I wanted cruise, there's a few items on the market, but I'd get someone else to fit it

Chops

Is any-one going to consider legalities? Cruise control MUST disengage when brake pedal is pressed, good luck with insurance if something goes wrong. A lot of systems now will not function if the brake light fuse is blown.

Many vehicles have a High Idle (hand throttle if you like) that is suitable for winching ect but under law it can only function when the park brake is active – all that I’ve seen use the Engine ECU to control it. I know the older vehicles all had them but changes in regulations make it a specialised function.

Cruise Control would be hopeless in Low range – it wants to keep a constant speed so it would vary throttle input quite aggressively, I’m not sure if there are any legal requirements around minimum speeds but technically it could place ridiculous jolting loads on the driveline especially in a manual operating at slow speeds in low gears.

Well then gentlemen, good advice as always.....now that my dream of a $25 cruise control is in tatters what is the 'duck's nuts' of electronic cruise controls?

Maybe something I can buy online and take to my very reliable local auto electrician.

Also, does this create a warranty issue with the vehicle?