So in general there is a huge liability issue from the OEM having to do with
air bag time, fly-by-wire pedals etc.
That said here is a project I saw at the Detroit Electric and Hybrid vehicle
show
http://www.pi-innovo.com/products/openecu
When I talked with them they mentioned that they felt their hardware was a
good fit for prototype vehicles and conversions.
Michael 'T-Rex' Kadie
-----Original Message-----
From: Adrian DeLeon via EV
Sent: Sunday, October 05, 2014 6:06 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] Open source software to control donor ICE's CPUs
On 10/05/2014 11:37 AM, Michael Ross via EV wrote:
Automotive CPU, MPU, ECU, etc. are often designed using in ASICs
(Application Specific Integrated Circuits) and nowadays FPGAs (Field Gate
Programmable Arrays). The software is not served up by a drive, or kept
on
a flashable EEPROM, it is literally built into the silicon.
<snip>
It may require the
original the development system to reprogram it. Or it can only be
reprogrammed by replacing chips and boards - meaning it is very unlikely a
DIYer will have the ability to hack it.
That's exactly what "chipping" an ICE does. Replaces or reprograms a
memory chip that contains data tables used by the car's software. It's a
relatively safe process as you can only screw up the ICE's power profile
and emissions output but can't cause the onboard computer (and maybe the
car) to crash.
The only viable open source solution would be to design a carputer that
can read the car's original sensors, process the data, and use that to
control the fuel injection, dash, door locks, etc. In the case of a
Tesla, it might run the charger/inverter. Unfortunately, most
EV-specific hardware probably has its own computer system that expects
to send/receive proprietary and possibly encrypted data - making it
close to impossible to control with a DIY computer unless MUCH help and
documentation is provided by the OEM.
Related story: A friend of mine converted a 2000-ish VW Jetta using a
series DC motor. His biggest headache was the low oil pressure buzzer in
the instrument cluster. Without a valid reading, the buzzer would go off
constantly. He cooked up a circuit that would send a "normal" oil
pressure reading, then proceeded to get startled at every stoplight! The
dash computer would see the motor RPM drop to 0, notice the oil pressure
was still normal... and set the buzzer off! Don't know if he ever
managed to trick the instrument cluster into staying quiet. Didn't want
to kill the buzzer as it is also used as a headlight reminder, seatbelt
warning, etc.
-Adrian
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
For EV drag racing discussion, please use NEDRA
(http://groups.yahoo.com/group/NEDRA)
