Wireless ECU Mo

Team W

Kirchgessner, Robert

onitoring System

WEMS

Houghton, Nathaniel

IntroduECU (Electronic Control Umonitoring and controlling eng ginjection ratio, RPMs, etc).

ECU keeps track of vital engb d f di ican be used for diagnosing o

Notifies of problem through “

Provides OBD-II (OnBoard Dretrieve information.

uctionnit) – responsible for ngine parameters (fuel g (

gine performance statistics that f lf tiof malfunctions.

“Check Engine” light.

Diagnostics) connector to

ECU and

OBD-II

http://www.carplugs.com/images/Obd.jpgmages/Obd.jpg

http://www.ashspecz.cobitECU-1.jpg

d OBD-II

ECU

om/ashspec/ECU/16-bit%20images/16-

WEWEMS - Wireless ECU Mon

WEMS is a system for wirelWEMS is a system for wirelparameters via a personal c

These parameters can be uThese parameters can be uengine malfunctions or help

Most OBD-II scanners are indiagnostics. WEMS will provoperation.

MSnitoring System.

essly monitoring ECUessly monitoring ECU computer.

sed to diagnose currentsed to diagnose current p to predict future malfunctions.

ntended for in-shop pvide logging during vehicle

Main FeProvide real time ECU data interface.

Log ECU data to flash for fu

− Can log 8 hours ofCan log 8 hours ofevery 0.5 secondsCarolina for instan

Display and clear ECU errobuttons or wireless interface

eaturesto the user through a wireless

uture download / analysis.

f data if 9 statistics are loggedf data if 9 statistics are logged s (Gainesville → North nce).r codes (through LCD and e).

System Diagramm – Car Module

System Diagramm – PC Module

Major ComWireless transmission/recep

UART to USB FTDI FT232UART to USB – FTDI FT232

Atmel ATmega 644P.

ELM327 ODB-II interface IC

Power supply circuitry.

mponentsption – XBee Pro.

2R2R.

C.

Car Moduule PCB 1

Car Moduule PCB 2

Wireless Module PCB

Firmw

Three main modes of oELM Pass Through MConfiguration ModeConfiguration ModeLogging Mode

ware

operation:Mode

Firmware: ConfInteractive commands:

− Read flash / EEPROMRead flash / EEPROM

− Erase flash.

− Turn echo on / off.

− Change to pass throu

− Enable live statistics m

Non-interactive commands:

− Download logged data

− Download configuratio

− Upload configuration.

figuration Mode

M data (hex dump)M data (hex dump).

gh / logging mode.

mode.

a.

on.

PC SoSoftware that allows the user t

Create a device configuratioCreate a device configuratio

Upload/Download device co

Download logged data (CLI

Generate plot script for gnu

Calculate statistics from logtime stopped, minimums, m(CLI)(CLI)

ftwareto:

on file (CLI and GUI)on file (CLI and GUI).

onfiguration (CLI and GUI).

).

plot (CLI).

ged data (number of stops, aximums, distance traveled)

PC Software Screenshots

PC Software Screenshots

Example of LLogged Data

Biggest

Interfacing with a devmultiple output formamultiple output formaschemes.Preventing our car baduring debug sessionCreating code robustOBD initialization failfast enough to allow

Hurdles

vice (ELM chip) with ats and initializationats and initialization

atteries from dying ns.t enough to deal with ures, ELM bugs yet , g yfor our logging events.

Improvements /

Improve flash loggingpower failurespower failures.Improve power consuImprove wireless datReplace ELM with smReplace ELM with smreduction).

/ New Features

g scheme to support

umption.ta transfer rate.mall uP (costmall uP (cost

Cost AnELM327J1962M Cable2 x XBee Pro2 x XBee ProATmega644P1 x UART to USB (FTDI)1 LCD1 x LCDMiscellaneous components

Estimated total cos

A similar product, the ElmScanAnother product offered by the

id i l tiprovides no wireless connectio

nalysis$26$16$32 x 2$32 x 2$7.00$5$8$8Estimated $10-$15

st $133-141

5 Bluetooth costs $200. same company (that ) t $140on) costs $140.

Questtions?