home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!gatech!mailer.cc.fsu.edu!sun13!ibms4.scri.fsu.edu!rulon
- From: rulon@ibms4.scri.fsu.edu (Phil Rulon)
- Newsgroups: rec.autos.tech
- Subject: Re: Fuel Injection Question
- Message-ID: <11088@sun13.scri.fsu.edu>
- Date: 12 Oct 92 15:21:16 GMT
- Sender: news@sun13.scri.fsu.edu
- Organization: SCRI, Florida State University
- Lines: 32
-
- In article <1992Oct06.214032.31252@lobo.rmhs.colorado.edu> seanr@lobo.rmhs.colorado.edu (Sean Reifschneider) writes:
-
- > The Bosch L-Jetronic systems mainly use air flow to regulate
- > the fule flow. I beileve that the L Jetronic system is the one that I
- > was reading about with the aux air valve. This preforms the same purpose
- > as the thermo time switch and extra fule injector because it closes over
- > time when it's cold, and due to the extra air flowing, it uses more fule.
-
- The Bosch L and D systems both have a thermo-time switch which determines
- whether the cold start injector (valve) opens. The thermo-time switch
- is a binary logic device. (roughly)
-
- sec
- <15 >15
- eng temp (F) <60 1 0
- >60 0 0
-
- It's not quite digital, there's a ramp (higher temperature less time).
-
- It basically opens the cold start injector for ~15 sec when the engine is
- cold.
-
- The aux. air valve is also found on L and D systems. It's a fast idle
- control. Bosch should have called it a warmup throttle or something. It
- just lets a little air past the throttle when the engine is cold.
- Most of them are electric, Volvos (early anyway) are mechanical.
-
-
- Phil Rulon rulon@mailer.scri.fsu.edu
- Supercomputer Computations Research Institute
- Florida State University
- Tallahassee audio (904) 644 7008
-