3 Series E46 316i (N45) SAL
[system overview ...]
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N45 and N46 engine: E87, E90, E91
[system overview ...]
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N45TU2 and N46TU2 engines:E60, E81, E87, E90, E91, E92, E93
[System overview ...]
Brief description of components
The engine control system is described on the basis of the N46.
Differences for the E87 or E90 are marked "> E87, E90".
For the digital engine electronics (DME) on the N46, the following sensors supply signals to the DME control unit:
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Eccentric shaft sensor
The eccentric shaft sensor records the position of the eccentric shaft for the Valvetronic. The eccentric shaft
adjusts the camshaft so that the optimum valve lift for the inlet valve is achieved regardless of operating
condition (infinitely adjustable valve lift at intake).
The eccentric shaft is adjusted by the Valvetronic actuator. The eccentric shaft sensor is equipped with 2 angle
sensors which operate independently of one another.
The DME control unit adjusts the position of the eccentric shaft via the Valvetronic actuator until the actual and
the nominal position correspond.
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Intake camshaft sensor and exhaust camshaft sensor
The valve gear is equipped with variable camshaft control (double VANOS) for the inlet and exhaust camshaft.
Both camshaft sensors record camshaft adjustment.
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Alternator
The alternator exchanges data with the DME control unit using a bit-serial data interface. The alternator sends
the DME control unit information on type and manufacturer, for example. This enables the DME control unit to
modify the alternator control to suit the alternator model which has been installed.
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Intelligent battery sensor
The intelligent battery sensor exchanges data with the DME control unit using a bit-serial data interface. The
intelligent battery sensor sends the DME control unit information on current battery status, for example.
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EWS control unit or CAS control unit
The electronic immobiliser (EWS) is an anti-theft system which prevents the engine from starting.
The engine can only be started if the electronic immobiliser enables this.
> E46, E83, E85
The immobiliser control unit sends an encoded release signal to the DME control unit via the EWS data line. The
engine can only be started after this.
> E60, E81, E87, E90, E91, E92, E93
The immobiliser functions are assumed by the Car Access System (CAS). In addition, the CAS control unit also
assumes the convenient-start system.
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4th generation EWS
On the 4th generation EWS there is no longer a direct wire (EWS data wire) between the DME/DDE and
the CAS.
The CAN data wire (PT-CAN and K-CAN) and the K-bus (also known as the CAS bus) are used to transmit
the EWS data signal. The K-bus is used whenever the EWS signal cannot be transmitted on the CAN data
wire.
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Crankshaft sensor
The crankshaft sensor records the position of the crankshaft with the aid of an increment gear screwed to the
SBT Engine control for N45, N46 E46, E60, E81, E83, E85, E87, E90, E91, E92, E93
BMW AG - TIS
22.01.2013 17:30
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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