BMW 3: 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 start
- Warm-up phase
- Operating temperature
- Transition from normal operation to maximum cooling requirement
- Maximum cooling requirement
X - Rotational angle in angular degrees
- Heater circuit
- Main coolant circuit
- Minor coolant circuit
The openings on the rotary valve vary the cross-sections of the different coolant ducts as a function of the rotational angle of the rotary valve. The following graphics schematically represent the various engine operation phases, from cold start to maximum cooling requirement.
Cold-start phase
Point A in the heat management module circuit diagram designates the cold start with an engine that has completely cooled down.
Cold-start phase
In the cold-start phase, the coolant circulates exclusively via a bypass in the coolant pump. The rotary valve in the heat management module closes the coolant lines so that the excess pressure that builds up opens the pressure relief valve in the coolant pump (opening pressure 2.2 bar) and the coolant is recirculated in the coolant pump.
Because the coolant circuits through the exhaust turbocharger and the ventilation line of the cylinder head cannot be closed, a low volumetric flow is returned to the coolant pump here.
Warm-up phase
Area A in the circuit diagram for the heat management module shows the opening angle of the rotary valve in the warm-up phase.
Warm-up phase
In the warm-up phase, the heat management module additionally opens the connection to the heating in addition to opening the bypass line. The coolant flows through the cylinder head, the exhaust turbocharger and the engine oil/coolant heat exchanger. The electrical Split Cooling Valve is closed; no coolant flow through the engine block (Split Cooling).
READ NEXT:
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
Coolant pump
The layout and function of the coolant pump have been revised and adapted to
match the cooling
concept of the B46TU/B48TU engines.
Coolant pump
Pressure relief valve closed (pressure <
Exhaust System
Exhaust turbocharger
Exhaust turbocharger
The exhaust turbocharger can be replaced individually and is exclusively made
of steel. The boost
charge pressure is still controlled by an electrical waste
SEE MORE:
Services
General information
If the vehicle has a wireless network connection,
this enables data to be exchanged between the
vehicle and other systems. The wireless network
connection is realized via an in-vehicle transmitter
and receiver unit or via personal mobile devices
brought into the vehicle, for inst
Ventilation
Concept
The air flow directions can be individually adjusted.
Adjusting the ventilation
General information
The air flow directions can be adjusted for direct
or indirect ventilation.
Open the vents and position them to ensure effective
climate control.
Direct ventilation
The air flow is directed t
