Technical data

10
7
Activation of the fuel pumps
The DME controls the EKP 1 corresponding
to requirements via the electric fuel pump
EKP.
The EKP 2 cuts in non-regulated in the high
load range. The pressure regulator in the tank
is activated in a variable mode in order to set
the fuel pressure to the target value with the
activated second pump.
The PWM interface is a single-wire interface,
via which the DME activates the EKP module
and therefore varies the delivery capacity of
the electric fuel pump EKP.
The task of the EKP module is to clock the
electric fuel pump (EKP) via the output stage
with precisely this pulse duty factor. The
deviation of the pulse duty factor between the
input and output PWM signal must not be
greater than 3 %.
This tolerance applies over the entire service
life of the EKP module. The second electric
fuel pump EKP additionally cuts in on reaching
a pulse duty factor of 100 %.
3 - Block diagram of EKP
module
Index Explanation Index Explanation
1 Activation 4 Control logic EKP 2
2 Power supply 5 Output stage EKP 1
3 Control logic EKP 1 6 Output stage EKP 2