E
Ed
- Jan 1, 1970
- 0
A part called the "throttle switch " for the early Jaguar V12 is no longer
available. Its main
function is to generate extra pulses to the fuel injection system when the
accelerator is
quickly pressed. The switch is mechanical, attached to a rotating shaft
attached to
the throttle capstan. A path to ground as makes and breaks as a rotating
contact arm
slides along serrated copper anth on a small circuit board. So basically, it
can be thought of
a switch that opens and closes 10 or 12 times (I've forgotten which, but I
can look it up)
as the throttle moves from idle to full open.
Later models of the same engine have a different electronic control unit
(ECU) which relies
on a throttle potentiometer instead of a switch. For several reasons it is
not practical to
switch to the newere ECU, but the thought has occured to me that I might be
able to
use the newer throttle pot to replace my switch. Mechanically, it fits
exactly in place of the switch.
All that would be required is a circuit that takes the linearly varying
resistance from the pot
and generate outputs that simulate the 10 (or 12) closures of the mechanical
switch.
I'm not prepared to launch this effort immediately, as I'm not sure current
running problems
are due to the throttle switch, but I would like to here some ideas on how
to approach this.
TIA
Ed
available. Its main
function is to generate extra pulses to the fuel injection system when the
accelerator is
quickly pressed. The switch is mechanical, attached to a rotating shaft
attached to
the throttle capstan. A path to ground as makes and breaks as a rotating
contact arm
slides along serrated copper anth on a small circuit board. So basically, it
can be thought of
a switch that opens and closes 10 or 12 times (I've forgotten which, but I
can look it up)
as the throttle moves from idle to full open.
Later models of the same engine have a different electronic control unit
(ECU) which relies
on a throttle potentiometer instead of a switch. For several reasons it is
not practical to
switch to the newere ECU, but the thought has occured to me that I might be
able to
use the newer throttle pot to replace my switch. Mechanically, it fits
exactly in place of the switch.
All that would be required is a circuit that takes the linearly varying
resistance from the pot
and generate outputs that simulate the 10 (or 12) closures of the mechanical
switch.
I'm not prepared to launch this effort immediately, as I'm not sure current
running problems
are due to the throttle switch, but I would like to here some ideas on how
to approach this.
TIA
Ed