bj928
|
| posted on 11/12/09 at 01:16 AM |
|
|
electric hand brake
As i believe a few car makers are building cars with a press button hand brake(BMW 7 series), does that mean its ok for IVA, or do i have to still
have a cable.
|
|
|
|
|
richardlee237
|
| posted on 11/12/09 at 05:41 AM |
|
|
See below extract from IVA manual.
The way I read it is that it can be operated electrically but must stay on by mechanical locking even if there is no electrical power.
9.
The ‘parking’ braking system must be capable of being operated using a control which is independent of the service brake, and once applied capable of
being maintained in the ‘on’ position solely by mechanical means.
Brake Systems 09A
Revision: 1 Date: 27/03/2009 2 of 4
Quote Lord Kelvin
“Large increases in cost with questionable increases in performance can be tolerated only in race horses and women.”
Quote Richard Lee
"and cars"
|
|
|
prawnabie
|
| posted on 11/12/09 at 06:50 AM |
|
|
Most of the electric handbrakes I have worked on are just 2 cables connected to an electric motor in a box with a "rachet" mechanism to
retain the braking in case of failure and a emergency release.
The electronics on them are more complex as the vheicle montiors the wheel speeds for a while after the vehicle is parked in case of failure. The
computer controlling the system would also need to recognise the biting point of the car release the handbrake.
|
|
|
turbodisplay
|
| posted on 11/12/09 at 11:01 AM |
|
|
I would have some sort of feeback indicator to show if the tension is not enough.
Maybee a spring with a microswitch "sensor".
Also you have to think of the brake test function, that is normally dealt with the handbrake switch.
Darren
[Edited on 11/12/09 by turbodisplay]
|
NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
|
britishtrident
|
| posted on 11/12/09 at 02:46 PM |
|
|
The simplest electric handbrake systems used a worm and pinnion or screw and nut mechanism as in a screw jack --- the fancy name for these is
overhauling mechanisms. In simple terms think of a screw jack, turning the screw will raise the load but the static friction is to great for load to
turn the screw. So if you jack the load up it stays up.
|
|
|
morcus
|
| posted on 11/12/09 at 04:35 PM |
|
|
I wouldn't think the hand brake would need any kind of setting to the biting point as they don't turn off automatically, you'd have
to time it your self like a normal one. I know someone who rented a Vauxhall with an electronic handbrake and he said it was really annoying because
it turned itself on so he was driving with it on.
It must be IVA legal in some form, a few people in the trade i've spoken to reckon it'll be standard for production cars befor long.
|
|
|
britishtrident
|
| posted on 11/12/09 at 06:04 PM |
|
|
The use in production cars is all to do with engines turning themselves off at the traffic lights --- ugh
|
|
|
Howlor
|
| posted on 11/12/09 at 06:13 PM |
|
|
Mine passed no problem with SVA. Worm driven with adjustable limit switches to control the worm motion. My particular drive could pull IIRC 70Kg but
required 2500kg to unwind it!
|
|
|
prawnabie
|
| posted on 11/12/09 at 06:13 PM |
|
|
quote:
Originally posted by morcus
I wouldn't think the hand brake would need any kind of setting to the biting point as they don't turn off automatically, you'd have
to time it your self like a normal one. I know someone who rented a Vauxhall with an electronic handbrake and he said it was really annoying because
it turned itself on so he was driving with it on.
It must be IVA legal in some form, a few people in the trade i've spoken to reckon it'll be standard for production cars befor long.
All the ones I have worked on have turned off just as you hit the biting point.
|
|
|
bj928
|
| posted on 11/12/09 at 06:35 PM |
|
|
thing i'm going to have to look at options, i was looking at using a line lock, but that needs power to stay on and the electric line locks are
only designed for max of 60 second use, thanks for the feed back
|
|
|
bj928
|
| posted on 11/12/09 at 06:48 PM |
|
|
looks like the ford c max uses a self contained electric cable pulling electric hand brake, not cheap at £150 used, but guess it would work.
http://cgi.ebay.co.uk/06-08-C-MAX-CMAX-ELECTRIC-HANDBRAKE-MOTOR-CABLES_W0QQitemZ120504092289QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=
item1c0e9a8681
|
|
|
Howlor
|
| posted on 11/12/09 at 06:51 PM |
|
|
This kinda thing is like I used.
Linear Actuator
|
|
|
britishtrident
|
| posted on 11/12/09 at 09:58 PM |
|
|
quote:
Originally posted by bj928
thing i'm going to have to look at options, i was looking at using a line lock, but that needs power to stay on and the electric line locks are
only designed for max of 60 second use, thanks for the feed back
A line lock of any kind would defo not be allowed ----
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
bj928
|
| posted on 12/12/09 at 02:10 PM |
|
|
this looks interesting.
quote:
Originally posted by Howlor
This kinda thing is like I used.
Linear Actuator
|
|
|
