power steering hacking

UPS:
Scheduled Delivery: 03/24/2008
The part was on back order...

O took the car into the dealer yesterday for the 25000 maintenance, they did not say any thing about the new switch and DB9 connector that was installed.

I dont have a way of reading read the canbus data. The Make controller might be able to encode/decode CAN frames but I do not know much about CAN. It might provide a simpler interface? Any one now how the pearly parking prius cars are interfacing in to the steering?

 

ken1784 thanks for the info.
I might know now what that "outer" sensor was. It might be the "steering angle sensor"
I do not know any thing about CAN or how it works. Hear is the C library I have to work with for CAN.
Can.c
Can.h

Ken if you know enough about CAN to help out / point me in the right places to look, That would be wonderful.

I did get my package, But I am having some problems getting the DAC to function.
Hear is the DATA Sheet for the TLC7524
I did try to set up the example on Pg.5 but it did not seem to work.
I did not have an spare Op-Amp, to try out Figure 3., but will try to get one today.

 

Got the DAC to work, and will be finishing up the controller board for it.

As far as CAN, I think it is a grate idea but, I do not have the hardware or the knowledge of the CAN system to do what I want. I do believe it may provide a beater interface, it may be come the platform I launch my new project form.

Will be posting video of the new controller, interfaced with the PC and a joy stick. Test if the software is working properly.
This may be a few days thou.

 

So wow, a few months its been now, i started a new job, so i have not had any time to work on this much, but i looks like i got a current controller not voltage. so the first tests did not go. i have a new controller on order and will be hear on the 19th.

allso been fine-tuning the software, should have a working state line system in a few more days.
-tft

 

Re: power steering hacking eliminating the smear!!!

So after hours working with the timing for the new chip and some fancy new hardware, I HAVE A WORKING system!!!
There has been some long hours, distorting 3 2051(8051)chips, and ~ 15 NPN's (ended up not using any)

Found out that using the car's voltage for running my circuit not a good plan, looks like it frys the gated outputs on my 2051's so after distorting 3 of them I stopped, lol.

I did the first test to day and hear is a short video of it in action.

[ame="http://www.youtube.com/watch?v=-baRssym-Fo"]Prius Digital Steering Interface[/ame]

IC used.
MCP41050 256 Step SPI 50kOhm
A89C2051 2kB Flash, 128B RAM

What's the status you ask?
1) I have a working tracking software for the road.
2) The computer controlled steering is all most dun, it is computer controlled but not yet verbal speed for rate of turning(see video).
3) Need to locate the angel sensor(I think i know where it is, no time today to test.)
4) complete the interface software for the steering once the angel sensor is incorporated.
5) Distance sensor for added automation.

 

Houston we hit a snag,
I was right about the location of the steering angle sensor, rember the photo of the thing I thought was the PS TQR sensor the one with the 5 wires. well its the steering angle sensor, but bad news its a CAN interface.
there might be a way to tap into it but its contacted right behind the whell and you would haft to remove the stering whell to get to it.
(not going to happen)
So its looking like i'm going to haft to use CAN.....


I know this Would be a lot easer if i was using CAN in the first place ( ken1784 the sites you gave me a wile back are down now )
I don't really have the extra cash to buy the $$$108 can adaptor right now. any no of a chipper solution??

I'm going to see if the make controller's CAN interface might work or if I can make one with some 2051's

 

All the controllers are on the CAN buss
the power steering is on the CAN buss but the sensor that tell the CAN controller for the power steering is "tapeable" where the Angel sensor is "tapeable" it would require removing of the steering wheel to gan access to the board to reverse engineer the tap. i would do it but i have no way to remove the wheel. I do have access to the backside of the board but with out knowing what pins to tap it so no good. as far as the "gas" and "brake" i'm not messing with at thins point. the cruse control is a simple duplex voltage a 1 wire system. The plan is to get on a highway flip a switch and it just cruse down the road. one thing that is cool about the prius' cruse-control is the fact it can slow down the car... fairly fast... try it put it in cruse-control then with out canceling it pull down on the leaver you can feel the car slowing...

Good point about the reading/writing to the CAN-buss did not even consider that fact.

soo... any one remove there stering wheel for some reason and want to take a few photos for me???

livininspirit by the way I am just a (21 year old) hobbits with no formal training in any of this... If have any good web sites, old books, or docs that you think might some how pertain to any of the subject of this project I can never get enough!!

 

wiki says this about it.

ISO 9141-2. This protocol has a data rate of 10.4 kbaud, and is similar to RS-232. ISO 9141-2 is primarily used in Chrysler, European, and Asian vehicles.
pin 7: K-line
pin 15: L-line (optional)
UART signaling (though not RS-232 voltage levels)
K-line idles high
High voltage is Vbatt
Message length is restricted to 12 bytes, including CRC

so it looks like 20hz would be no problem.

 

thanks i was having problems getting to gi & Attila Vass's Homepage...
the last week or so the site looks to have been down or my dns servers where not working.
I was going to use the site, it seems to be back now :high5: