BMW M5 Wartungshandbuch PDF herunterladen (Seite 52)

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

1 2 ... 47 48 49 50 51 52 53 54 55 56 57 ... 119 120

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BMW M5 Wartungshandbuch Seite 52