6 Series 650i (N62TU) Coupe
The coolant temperature is the measured variable used in these calculations, for example:
•
Injection quantity
•
Nominal idle speed
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Temperature sensor on radiator outlet
The temperature sensor on the radiator outlet records the coolant temperature downstream of the radiator.
The DME control unit requires information on the coolant temperature at the radiator outlet, e.g. to actuate the
electric fan.
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Inlet pipe pressure sensor
On engines with Valvetronic, no vacuum is generated in the intake manifold in unthrottled operation. However, a
vacuum is needed for certain functions, e.g. fuel tank ventilation or brake booster. For this reason, the electric
throttle-valve actuator is closed as far as necessary to generate the required vacuum.
The inlet pipe pressure sensor measures low pressure in the intake manifold.
In engines with Valvetronic, for example, a partial vacuum of approximately 50 millibars is set in idle speed.
Together with other signals, the inlet pipe vacuum serves as a substitute value for the load signal.
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4 knock sensors
The 4 knock sensors detect combustion knock.
The piezoelectric knock sensors record structure-borne sound in the individual cylinders. The DME control unit
evaluates the converted voltage signals for each cylinder separately. The DME does this using a special
evaluation circuit. Each knock sensor monitors 2 cylinders. Two knock sensors are packages as a single
component.
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4 oxygen sensors
For each cylinder bank, there is one oxygen sensor upstream of the catalytic converter and one oxygen sensor
downstream of the catalytic converter.
The oxygen sensors upstream of the catalytic converter are permanent sensors (LSU 4.9 control sensors).
The oxygen sensors downstream of the catalytic converter are the familiar jump sensors (jump-like voltage
changes at Lambda = 1).
These oxygen sensors are the control sensors.
The oxygen sensors are heated by the DME control unit so that they reach their operating temperature more
quickly.
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Brake light switch
Two switches are fitted in the brake light switch: The brake-light switch and the brake light test switch (duplicated
as a safety measure). The signals enable the DME control unit to determine whether or not the brake pedal is
depressed.
The Car Access System (CAS) provides the terminal R supply for the brake light switch via the light module
(LM).
> E70
Power supply direct from CAS.
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Clutch module
The DME control unit uses the clutch switch signal in coupling mode to recognise whether the clutch pedal is
depressed (manual transmission).
This signal is important for the internal torque monitoring. Coasting mode, for example, is not possible when the
clutch is depressed.
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Oil condition sensor
The oil condition sensor increases the function range of the thermal oil level sensor.
SBT 8-cylinder spark-ignition engine N62TU E60, E61, E63, E64, E65, E66, E70
BMW AG - TIS
19.01.2013 07:31
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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