Heat Management Module - BMW B46TU Reference Manual

B46TU￿/￿B48TU￿Engines
3.￿Cooling￿System
3.2.￿Heat￿management￿module
The￿heat￿management￿module￿replaces￿the￿characteristic￿map￿thermostat.
Heat￿management￿module
Index
1
2
3
4
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.
20
Explanation
Electrical￿Split￿Cooling￿Valve￿(SCV)
Coolant￿output￿towards￿the￿coolant￿pump
Electrical￿actuator
Rotary￿valve