BMW S58, Руководство пользователя

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S58�Engine
8.�Intake�Air�and�Exhaust�System
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If�the�electric�controller�detects�an�internal�fault,�it�notifies�the�DME�control�unit�engine�management.
The�exhaust�flap�cannot�adopt�an�intermediate�setting;�it�is�either�fully�opened�or�closed.�The�flap�is
moved�to�the�respective�mechanical�end�stops�by�means�of�pulse-width�modulated�signals�(PWM
signals).
Electrical�exhaust�flap S58B30T0�engine
Installation�location right�and�left
PWM�signal�open 10%�duty�cycle
PWM�signal�closed 90%�duty�cycle
The�electrical�controller�of�the�exhaust�flap�can�be�replaced�separately.�The�controller�can�be�moved
into�an�installation�position�using�the�BMW�diagnosis�system�ISTA.
The�exhaust�flaps�are�operated�on�a�demand-oriented�basis�and�can�be�influenced�by�setting�the
engine�dynamics�control�buttons�to� “Efficient” ,� “Sport” �or� “Sport+” .
Apart�from�the�engine�dynamics�control�buttons,�the�position�of�the�exhaust�flaps�can�also�be
influenced�by�the�sound�button�in�the�center�console�switch�cluster.
In�default�mode�the�button�is�deactivated�and�the�acoustic�characteristics�linked�to�the�modes.�If�the
Sound�button�is�pressed�then�the�vehicle�interior�acoustics�are�trimmed�to�the�maximum�comfort
setting.�That�is�independent�of�the�selected�driving�mode�–�in�other�words�the�Sound�button�overrides
other�acoustics�settings.
Thus,�in�order�to�obtain�maximum�comfort�(quietness)�when�the�Sound�button�is�active,�the�exhaust
flap�is�kept�closed�for�as�long�as�possible.�Therefore,�it�no�longer�opens�when�the�driver�calls�for�more
power�but�instead�in�response�to�the�exhaust�mass�flow�rate.�It�remains�closed�as�long�as�it�does�not
affect�performance�and�fuel�consumption�or�until�the�perceived�noise�level�in�the�vehicle�interior�is
more�comfortable.
Activation�of�the�Sound�button�also�reduces�all�other�activities�that�have�an�effect�on�the�interior
acoustics�(ASD).
If�the�vehicle�has�not�entered�sleep�mode,�i.e.�is�started�up�again�after�being�parked�for�a�short�period,
the�settings�are�retained.�The�same�applies�to�the�Auto�Start/Stop�function.
Due�to�the�internal�interconnection�of�the�exhaust�tailpipes,�the�exhaust�always�flows�through�both
pairs�of�tailpipes�regardless�of�the�flap�setting.
The�sound�button�is�connected�with�the�Body�Domain�Controller�(BDC)�via�a�LIN�bus.
8.2.9.�M�Sport�exhaust�system
The�M�Sport�exhaust�system�SA�1MA�comes�as�standard�with�Competition�package�SA�7MN�on�the
F97/F98.)