BMW 3: Split cooling
Split cooling is a new development for the B46TU engine. This cooling concept is a modified version of which is already used in the N63TU2.
The Split Cooling function uses the electrical Split Cooling Valve (SCV), 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.
Coolant circuit
- High cooling requirement, Split Cooling cylinder head
- Low cooling requirement, Split Cooling crankcase
- Cylinder head
- Crankcase
- Heat management module
- Split Cooling Valve (SCV)
- Coolant pump
Cooling system overview
- Radiator
- Coolant temperature sensor radiator outlet
- Additional coolant radiator
- Electric fan
- Split Cooling Valve (SCV)
- Coolant pump
- Bypass valve
- Engine block (crankcase)
- Coolant temperature sensor engine outlet
- Cylinder head
- Exhaust turbocharger
- Heater core
- Expansion tank
- Component temperature sensor
- Engine oil/coolant heat exchanger
- Transmission oil/coolant heat exchanger
- Heat management module
- Additional coolant radiator
In Split Cooling, the cooling requirements for the crankcase and the cylinder head are managed by the electrical Split Cooling Valve (SCV). The fact that the engine reaches operating temperature more quickly again translates to substantial consumption and emission reductions.
To guarantee optimal heat distribution during the cylinder head and crankcase warm-up, the coolant supply for the cylinder head and crankcase is controlled individually. Controlled by the Digital Motor Electronics (DME), the coolant is distributed by the electrical Split Cooling Valve (SCV) on the heat management module in the warm-up phase such that substantially more coolant is available to the cylinder head than to the crankcase. Depending on the engine's operating condition, the Digital Motor Electronics (DME) controls the distribution of the coolant quantity to the cylinder head and crankcase as required.
A bleeding procedure must be carried out in accordance with the repair instructions and is required following a part exchange in the cooling system or refilling of the cooling system.
A video demonstrating the bleeding procedure can be found in the B46TU Engine on-line course (OL1837).
Filling without a vacuum filler device (watering can filling) is not approved There is a risk of engine damage in case of failure to comply The filling procedure must be observed Operation of the vehicle is not permitted without completing the entire filling procedure sequence.
There is a risk of functional limitations or overheating.
READ NEXT:
Heat management module
The heat management module replaces the characteristic map thermostat.
Heat management module
Electrical Split Cooling Valve (SCV)
Coolant output towards the coolant pump
Electrical actuator
Rot
Operating strategy
The following graphic shows the positions of the rotary valve as the coolant
temperature increases:
Switching diagram heat management module
0% - Rotary valve closed
100% - Rotary valve open
Cold
Operating temperature
The positions of the rotary valve at engine operating temperature are shown
by area C of the heat
management module circuit diagram.
Operating temperature
The graphic shows control with the engine a
SEE MORE:
Malfunction
General information
A Check Control message is displayed.
Vehicle key recognition by the vehicle may malfunction
under the following circumstances:
The battery of the vehicle key is discharged.
Interference of the radio connection from
transmission towers or other equipment with
high transmitt
Overview
Button in the vehicle
Park assistance button
Ultrasound sensors
Ultrasound sensors of the PDC,
for instance in the bumpers.
Functional requirements
Ensure full functionality:
Do not cover sensors, for instance with stickers,
bicycle racks.
Keep the sensors clean and unobstructed.
Switching on/
