5 Series E60 M5 (S85) SAL
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SMG control unit
The SMG control unit actuates the clutch operation and gear change. Furthermore, the SMG control unit sends
messages to different control units, such as for adapting the engine speed.
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Hydraulic control unit
The hydraulic control unit performs the clutch operation and gear change electrohydraulically.
The hydraulic unit consists of the following components:
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Pressure accumulator
The pressure accumulator is fitted on the bottom left of the transmission. The pressure accumulator
supplies enough hydraulic power for the gearshifts.
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Hydraulic pressure sensor
The hydraulic pressure sensor is fitted directly to the hydraulic block of the hydraulic control unit. The
hydraulic pressure sensor reports the current hydraulic pressure to the SMG control unit. The hydraulic
pump is switched on and off accordingly.
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Clutch slave cylinder with PLCD sensor
The clutch slave cylinder executes the clutch operations. The release travel is measured by the PLCD
sensor (PLCD: Permanent magnetic Linear Contactless Displacement). The PLCD sensor is permanently
linked to the clutch slave cylinder by a screwed connection.
The SMG control unit actuates the clutch slave cylinder via the solenoid valve for the clutch.
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Monitoring of the clutch position
During clutch action, the SMG control unit continuously measures and monitors the position of the
clutch slave cylinder via the PLCD sensor. This also measures the clutch position.
In addition, the precise clutch slipping point is calculated from the different speeds of the engine and
transmission.
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Clutch slipping point
The clutch slipping point is stored in the SMG control unit to ensure that clutch operation is optimised.
The clutch slipping point is updated in the SMG control unit to take into account changes due to
installation tolerances and wear.
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Solenoid valve for the clutch
The solenoid valve for the clutch is used for actuating the clutch slave cylinder.
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Hydraulic pump with electric motor
The hydraulic pump with electric motor builds up to 90 bar system pressure for the gearshifts. The
hydraulic pump with electric motor is actuated via the SMG control unit.
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Hydraulic temperature sensor
The hydraulic temperature sensor measures the temperature of the hydraulic fluid at the hydraulic pump.
The signal is used for actuation of the transmission functions in the SMG control unit. The signal is
transmitted by a direct wire from the hydraulic temperature sensor to the SMG control unit.
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Pressure limiter valve
The pressure limiter valve prevent the oil pressure in the hydraulic control unit from becoming too high.
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Regulator block
The regulator block is installed in the centre of the transmission housing close to the clutch housing.
The regulator block consists of the following components:
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4 shift travel valves for actuating the hydraulic shift cylinders
SBT Sequential M transmission E60 M5, E63 M6
BMW AG - TIS
23.02.2013 19:41
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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