Preset cruise control?

Guest
I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric
 
On Sat, 20 Apr 2013 15:16:06 -0700, etpm@whidbey.com wrote:

I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric
Click to expand...
I worked on the original speed control at Philco-Ford, Santa Clara, in
1968. There's a LOT more to speed controls than just pulses. Like
all kinds of (forward and side) acceleration sensing, automatic
disengage and braking under adverse conditions.

Somewhere around here I still have a paper on all the dynamics of a
car's movement.

I used to scare my boss by test driving my circuits, driving up and
down 101 at 80+ MPH, while sitting cross-legged in the driver's seat,
using only the buttons on the steering wheel to control gas and
braking, whilst watching a Tek scope in the front passenger foot space
:-}
Click to expand...
If you're not careful, "you'll shoot your eyes out kid", wreck your
car, kill yourself... and your family will NOT collect on your
insurance.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Sat, 20 Apr 2013 15:25:46 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sat, 20 Apr 2013 15:16:06 -0700, etpm@whidbey.com wrote:

I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric

I worked on the original speed control at Philco-Ford, Santa Clara, in
1968. There's a LOT more to speed controls than just pulses. Like
all kinds of (forward and side) acceleration sensing, automatic
disengage and braking under adverse conditions.

Somewhere around here I still have a paper on all the dynamics of a
car's movement.

I used to scare my boss by test driving my circuits, driving up and
down 101 at 80+ MPH, while sitting cross-legged in the driver's seat,
using only the buttons on the steering wheel to control gas and
braking, whilst watching a Tek scope in the front passenger foot space
:-}

If you're not careful, "you'll shoot your eyes out kid", wreck your
car, kill yourself... and your family will NOT collect on your
insurance.

...Jim Thompson
Greetings Jim,
Click to expand...
I appreciate your comments. Especially tghe ones about insurance after
I get in a wreck. But I'm not considering tampering with the control
itself. I just want to connect the wires that sense the vehicle speed
temporarily to a pulse generator thatI make. Then after the cruise
control has a set speed it will monitor the vehicle speed and do
everything it is supposed to do. So no modifications will be made to
the cruyise control.
Eric
 
On Sat, 20 Apr 2013 16:48:50 -0700, etpm@whidbey.com wrote:

On Sat, 20 Apr 2013 15:25:46 -0700, Jim Thompson
To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> wrote:

On Sat, 20 Apr 2013 15:16:06 -0700, etpm@whidbey.com wrote:

I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric

I worked on the original speed control at Philco-Ford, Santa Clara, in
1968. There's a LOT more to speed controls than just pulses. Like
all kinds of (forward and side) acceleration sensing, automatic
disengage and braking under adverse conditions.

Somewhere around here I still have a paper on all the dynamics of a
car's movement.

I used to scare my boss by test driving my circuits, driving up and
down 101 at 80+ MPH, while sitting cross-legged in the driver's seat,
using only the buttons on the steering wheel to control gas and
braking, whilst watching a Tek scope in the front passenger foot space
:-}

If you're not careful, "you'll shoot your eyes out kid", wreck your
car, kill yourself... and your family will NOT collect on your
insurance.

...Jim Thompson
Greetings Jim,
I appreciate your comments. Especially tghe ones about insurance after
I get in a wreck. But I'm not considering tampering with the control
itself. I just want to connect the wires that sense the vehicle speed
temporarily to a pulse generator thatI make. Then after the cruise
control has a set speed it will monitor the vehicle speed and do
everything it is supposed to do. So no modifications will be made to
the cruyise control.
Eric
Click to expand...
Actually, that's one of my basic diagnostic (and design) schemes.

When I did the Bosch EC Motor Controller Chip Design I had their
discrete implementation in my lab (this pre-dates CAD).

I, in my usual modus operandi, had NO CLUE about motor controls, so I
would breadboard a section that behaved exactly as the Bosch discrete
system behaved.

When satisfied, I would jumper it in to the Bosch system. Pretty
soon, the breadboard was all mine. NOW I knew how it was supposed to
behave... this is called spec extraction the hard way >:-}

Then I went back, smoothed out all the edges, and reduced it to
device-level for a chip... now manufactured by NatSemi Scotland.

So, in retrospect, have fun! It will be a very educational, and
enjoyable, experience.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On 2013-04-20, etpm@whidbey.com <etpm@whidbey.com> wrote:
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do?
Click to expand...
suppose you have it set at a radically different speed to the one
you're currently doing, what's going to happen?

--
⚂⚃ 100% natural

--- news://freenews.netfront.net/ - complaints: news@netfront.net ---
 
On Sat, 20 Apr 2013 15:16:06 -0700, etpm@whidbey.com wrote:

I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric
Click to expand...
I'd say your thinking is flawed. You want to preset the speed? The
speedo pulses reflect the car speed, they have to be compared to some
other (relatively fixed) signal like a digital word/analog voltage
level. (2004 probably means digital)

If your introduced pulse train is lower than the setting of the
control the car would just keep increasing speed - and the converse;
higher and the car would probably slow to a stop.

Doesn't sound like something you want to mess with IMO.
 
On Sat, 20 Apr 2013 15:16:06 -0700, etpm@whidbey.com wrote:

I will be buying shortly a 2004 to 2006 Scion xB. Those years because
of the body size. I wanted one with a cruise control and it turns out
that they did not come with a cruise control option. Instead, if you
ordered one with cruise control the dealer installed it and only one
company made the device specifically for the xB. These are still
available so I will be installing one if the car doesn't already have
one. So now that the background info is out of the way here is my
question. The cruise control gets some sort of pulsed signal from the
car, probably the same pulse stream the speedo gets. If I can measure
this pulse stream at various speeds then maybe I can copy it and have
the cruise control sense my pulse stream. Then I can get on the
highway, turn the dial on my pulse generator to the desired speed, and
press set on the cruise control. I would need to have a switch that
disconnects the cruise control from the pulse stream from the car to
my manufactured pulse stream while the speed was being set, and then
back to the car once the speed is set. I know, why not use it the way
it's made and just drive at the proper speed to set the control. The
answer is just because I think it would be a fun project. Does this
sound like it would be a hard thing for someone with only pretty basic
electronics knowledge to do? I'm thinking that something as simple as
a 555 based pulse generator would work and I have made 555 timers from
scratch.
Eric
Click to expand...
It occurs to me that you "have the cart before the horse".

The pulse train is feedback from the wheel sensor that is compared to
a setting in the speed control, so you don't want to emulate the
feedback, you want to emulate the "command". For that vintage a car I
have no idea how it's done, probably a DAC.

...Jim Thompson
--
| James E.Thompson | mens |
| Analog Innovations | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
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