Exhaust Gas Recirculation (Egr) System Overview - Triumph TR7 Owner's Manual

EMISSION AND EVAPORATIVE LOSS CONTROL SYSTEMS
20
2-~
Fig. 24 TR8 E.G.R.
synem
Fig. 26 Rover 3500 e.G.R. system
,.,
The remaming emission and evaporauve loss control system
components described in this section
Bre
not directly
connected With the fuel injection system or liS electronic
control devices
Exhaust Gas Recirculation (E.G.R.) System (TAB and
Rover 3500 only)
System Description
To reduce the Nitrous Oxide (NOx) content in the exhaust. the
peak combustion temperatures Bre lowered by recirculating a
controlled quantity of the exhaust gases through the
combustion process.
The E,G.A. valve is mounted on the exhaust manlfold. A
control signal, taken from a thrallie edge tapping, gives no
recirculation at idle or full load, but does allow an amount of
reCIrculation. dependent on the vacuum signal and a
metermg profile on the valve under part-load condilions.
Exhaust gas flows from the valve to the Inlet plenum chamber
via a lagged pipe
Key to Fig. 24 and Key to Fig; 25
(1) E.G.A. valve
(2) Exhaust manifold
(3) E.G.A. pipe (asbestos lagged)
(4) Throttte edge vacuum to E.G. A. valve
(5) Plenum chamber