> According to 'Bosch Fuel Injection & engine Management", by Charles
> Probst:
>
> The first continuous injection system (CIS) (1977) was K-Jetronic.
> Air flow
> is measured by a circular plate in the air-flow sensor, which is
> mechanically linked to the fuel distributor. Until 1980, fuel
> delivery is
> strictly under mechanical control in direct relation to air
> flow; there are no electronics. VW, Audi, and Mercedes call
> it CIS.
>
> K-Jetronic with Lambda Control is an adaptation of K-Jetronic
mechanical
> control. The mixture is modulated with a limited electronic control
> in a
> feedback system to maintain a precise air-fuel ratio.
>
> KE-Jetronic combines K-Jetronic mechanical control with total
> electronic
> modulation of the mixture. It uses many of the same sensors
> used in L-Jetronic (a pulsed fuel injection system). It's
> capable of full mechanical fail-safe if the electronics fail.
> VW, Audi, and Mercedes call is CIS-E.
>
> Andy Hecker
> CIS in a '77 Rabbit (RIP)
> Digifant II in an '88 Jetta
>
> -------
> Paul,
>
> First - I'm sorry for the typos, and 'editing' compliments
> of MS word 'autocorrect'. It didn't like 'Jetronic' apparently.
> The systems described above are all 'Jetronic', not
> 'electronic(s)'.
>
> Second - the author of the 'Bosch..." book said his
> production year references (like the 'first seen in 1977'
> comment above were for the US market only.
>
> The chart lists injection in VWs from the Type 3s...
>
> On the history front - also from the Bosch book:
>
> "Bosch passenger-car fuel injection first appeared in 1927 as
> a diesel design using engine-driven pumps developing high
> pressure to deliver diesel fuel into the cylinders - direct
> injection. In 1937, these pumps were adapted to aircraft
> engines, with both diesel and gasoline fuel applications. In
> 19565, similar engine-driven gasoline injection pumps were
> developed for the Mercedes-Benz race cars and the 300SL production
> car, again injecting fuel at high pressure directly into the
cylinders.
>
> "The fuel-injection systems described in this book first appeared
> about
> 1967. They are completely different from engine-driven systems,
> delivering
> fuel at much lower pressures at the intake ports, and are generally
> electronically controlled. The early Bosch literature
> describes these systems as "non-driven". Bosch coined the term
> "Jetronic" to establish a common identity for their new
> designs in most of the 135 countries in which they operate.
>
> Andy
> -7 from the Russian judge for (lack of) editing...
>
> More "me too".. My '74 Volvo (wagon) had K-Jetronic. '71's had
> dual SU side drafts (our first Volvo) - lame. '72's had electronic
> FI (I think one year only - maybe the P1800's had more years). And
> I think '73 through about '78 had K-Jetronic. By '82 (our newest
> Volvo) they had Lambda (O2 sensor).
>
> The K-Jetronic ran fine, but had kind of weak throttle response. As
> far as throttle response, the sportiest Volvo I've driven is our '67
> 122S with dual SU HS6's. Kind of surprising since they don't have
> an accelerator pump..
>
> Matt-
Matt,
The SU uses oil damping of the air piston to slow down the
opening of the
throat. This increases venturi velocity and vacuum and thus fuel
flow when
throttle is opened, without to much extra air. Thick oil gives a
rich mixture
for acceleration. Very thin or no oil generally leads to a stumble
on quick
throttle opening. Underbonnet temperature changes the viscosity and the
effect of the damping and ruins all the careful tuning.
Colin Smith
Ebay has the book currentlly ;listed # 160058907520
http://cgi.ebay.com/ebaymotors/Bosch-Fuel-Injection-Engine-Management-Rolls-Royce_W0QQcmdZViewItemQQcategoryZ6762QQihZ006QQitemZ160058907520QQrdZ1QQsspagenameZWDVW
*/
Joel
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