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101
INJECTION
OPERATING PHASES : BOSCH ME 7.9.5 INJECTION SYSTEM
Engine : CFA
Correction by oxygen sensor
At idling speed, engine hot, stable with partial load, the signal emitted by the sensor causes an adjustment of the flow from the injector, so as to
remain on stoechiometric richness
R = 1/15 or lambda = 1.
Altimetric correction
The mass of air absorbed by the engine varies according to the atmospheric pressure, thus with altitude.
The altimetric corrector takes account of this variation in pressure and proportionally corrects the injection command time (quantity of fuel injected).
This measure of pressure occurs as the ignition is switched on and when the engine is operating at low engine speed.
Ignition function
The ignition advance is determined from the following information :
- Engine speed
- Engine load
- Engine temperature
This correction stabilises the engine by varying the advance from one TDC to the next, positively or negatively relative to the mapping value.
Corrections in injection advance are also applied during the transitory phases.
Synchronisation of ignition is achieved by the cylinder reference sensor
N°1.
Petrol vapour recycling (canister) function
Engine stopped : the electrovalve is closed ; the canister absorbs the fuel vapours coming from the tank.
The electrovalve, piloted by the injection ECU, recycles the petrol vapours stored in the canister.
The quantity of petrol stored in the canister is determined by the injection ECU.
As soon as the canister has to be purged, the ECU temporarily makes the engine operate on a homogeneous mixture.
Overspeed protection
The injection ECU permanently monitors the engine speed.
As soon as the engine speed exceeds the maximum value
(6 400 rpm)
, there is an injection cut-off.
FR-C1-page93-125-2005 9/01/06 8:51 Page 101