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Date:         Tue, 7 Apr 2009 18:32:10 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: [WetWesties] 1.9 loss of 1/3 power- Boggy Please HELP!!!
In-Reply-To:  <49DBED44.5090907@gmail.com>
Content-Type: text/plain; charset=us-ascii

--- On Tue, 4/7/09, Rocket J Squirrel <camping.elliott@GMAIL.COM> wrote:

> I am, however, a pretty good electrical engineer and I > gotta comment that > the circuitry in the ECU is hardly a "computer" > -- it's a bunch of > op-amps and other analog circuitry. I've only owned one > Vanagon so I don't > have a mass of experience (unlike many other on these > lists) but the idea > of a power cycle resetting the ECU seems fishy.

It does have a 8088 (or Z-80) microprocessor and an EEPROM (or ROM) in it. It's an 8 bit microprocessor. The analog circuit and devices are for signal conditioning and possibly for A-D conversion before the processor can deal with the signals. The program in the EEPROM should have some intelligence or algorithms in making decisions in how much fuel to inject into the intake, when to shut off, when to enrich and when to lean the fuel, based on the input from AFM, thermo sensors, engine RPM, etc. It also should have some unexpected fault recovery (fast recovery) routines that will keep it from running out of control. It is a computer technically.

David


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