BMW 5 Series: Split cooling
A new development for the B58TU engine is the split cooling. A cooling
concept which is used the
N63 TU2.
The split cooling function uses the electric split cooling valve, eSCV, to
enable on-demand decoupling
of the crankcase from the coolant flow both in the warm-up phase and in partial
load operation. In this
situation, the coolant is exclusively routed through the cylinder head. The
engine reaches its operating
temperature more quickly in the warm-up phase, and can be operated with reduced
emissions in
partial load operation.

Cooling circuit, B58TU engine
- High cooling requirement, split cooling cylinder head
- Low cooling requirement, split cooling crankcase
- Cylinder head
- Crankcase
- Heat management module
- Electric Split Cooling Valve (eSCV)
- Coolant pump

Cooling system for B58TU engine
- Coolant radiator
- Coolant temperature sensor, radiator outlet
- Electric fan
- Electric split cooling valve
- Coolant pump
- Pressure relief valve
- Coolant temperature sensor, crankcase
- Crankcase
- Cylinder head
- Exhaust turbocharger
- Heating
- Component temperature sensor
- Expansion tank
- Engine oil/coolant heat exchanger
- Transmission oil/coolant heat exchanger
- Heat management module
In split cooling, the cooling requirements for the crankcase and the cylinder
head are managed by the
electric split cooling valve. The fact that the engine reaches operating
temperature more quickly again
translates to substantial consumption and emission reductions.
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Heat management module with electric split cooling valve
Electric split cooling valve
To guarantee optimal heat distribution during the cylinder head and crankcase
warm-up, the coolant
supply fo
The function of the heat management module is similar to that of the heat
management module of the
B58 engine.
B58TU engine heat management module
Coolant output towards the coolant pump
Electri
The following graphic shows the positions of the rotary valve as the coolant
temperature increases.
Circuit diagram of heat management module in B58TU engine
0 % - Rotary valve closed
100% - R
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The Active Lane Keeping Assistant and Traffic Jam Assistant is deactivated
automatically
in the following situations:
If the vehicle departs from the detected lane or the lane width does not
meet the
requirements.
If the lane edges of the current lane are not detected by the KAFAS
stereo ca
Gray steering wheel symbol:
The system is on standby.
Green steering wheel
symbol:
The system is activated.
Yellow steering wheel symbol
and a signal sounds, if applicable:
System interruption is imminent.
Green steering wheel symbol
and lane marking symbol:
The system supports the driv