BMW 3: 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
- Rotary valve
A rotary valve inside the heat management module ensures needs-driven cooling
of the various engine
components. The opening cross-sections of the various coolant ducts can be
opened or closed
variably. A position sensor in the electrical actuator of the heat management
module forwards the
current position of the rotary valve to the Digital Motor Electronics (DME). The
exact position of the
rotary valve can thus be determined so that it opens or closes a precisely
defined cross-section with
respect to the various coolant ducts. Adjusting the cross-sections ideally
adapts the flow rates of the
coolant ducts connected to the heat management module to the engine operating
points. To correctly
position the rotary valve, the Digital Motor Electronics (DME) require
information including the coolant
temperature from the coolant temperature sensor, and the material temperature of
the cylinder head
from the component temperature sensor .Warm-up and cooling of the engine and the
supply to
ancillary components can be implemented as driven by requirements, thus
optimizing consumption.
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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
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
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 <
SEE MORE:
Control Display
Hazard warning system
Intelligent Safety
Ventilation
Glove compartment
Automatic climate control
Radio/multimedia, see Owner's Manual for
Navigation, Entertainment, and Communication
Controller with buttons
Parking brake
Automatic Hold
Driving Dynamics Control
SPO
General information
A low tire inflation pressure may cause the DSC
Dynamic Stability Control to be switched on.
Safety information
Warning
A damaged regular tire with low or missing tire
inflation pressure impacts handling, such as
steering and braking response. Run-flat tires
can maintain limited