I suspect, Chuck, that the mechanisms were already present as part of the
system to improve stability. Most German manufacturers have for a while now
had braking to individual wheels, as I understand it, to improve control in
cornering under adverse conditions. If that were the case, adding braking for
the cruise control would have cost little in weight or complexity.
I'll have a look for the video.
Chris
On 31 Mar 2013, at 13:58, Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> An interesting but relatively expensive manufacturing choice. Slowing
> using braking requires additional hardware in the form of some device to
> actuate the master cylinder other than your foot. Slowing using the
> transmission to downshift and employ engine braking requires nothing but
> a small bit of firmware to employ the hardware and other controls that
> are already there.
>
> I didn't know anything about BMW's regenerative braking so looked it up
> and found a video. It operates by tying the alternator to the drive
> train but the video is a bit sparse on the mechanics of the connection.
--
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