Intel® Quiet System Technology (Intel® QST)
Thermal and Mechanical Design Guidelines
71
target temperature. As a result of its operation, the PID control algorithm can enable
an acoustic-friendly platform.
Figure
7-2. PID Controller Fundamentals
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
Proportional
Error
Derivative (Slope)
Integral (time averaged)
RPM
Tempera
ture
Time
+ dPW
M
+ d
PW
M
+ dPW
M
+ d
PW
M
+ dPW
M
+ d
PW
M
-
-
dP
WM
dP
WM
-
-
dP
WM
dP
WM
-
-
dP
WM
dP
WM
Actual
Temperature
Actual
Temperature
Fan
Speed
Fan
Speed
Limit
Temperature
Limit
Temperature
For a PID algorithm to work limit temperatures are assigned for each temperature
sensor. For Intel QST, the T
CONTROL
for the processor and chipset are to be used as the
limit temperature. The ME will measure the error, slope and rate of change using the
following equations:
•
Proportional Error (P) = T
LIMIT
– T
ACTUAL
•
Integral (I) = Time averaged error
•
Derivative (D) =
Δ
Temp /
Δ
Time
Three gain values are used to control response of algorithm.
•
Kp = proportional gain
•
Ki = Integral gain
•
Kd = derivative gain
The Intel
®
Quiet System Technology (Intel
®
QST) Configuration and Tuning Manual
provides initial values for the each of the gain constants. In addition it provides a
methodology to tune these gain values based on system response.
Finally the fan speed change will be calculated using the following formula:
Δ
PWM = -P*(Kp) – I*(Ki) + D*(Kd)
Summary of Contents for Celeron Dual-Core E1000 Series
Page 10: ...10 Thermal and Mechanical Design Guidelines...
Page 26: ...Processor Thermal Mechanical Information 26 Thermal and Mechanical Design Guidelines...
Page 68: ...ATX Thermal Mechanical Design Information 68 Thermal and Mechanical Design Guidelines...
Page 86: ...Heatsink Clip Load Metrology 86 Thermal and Mechanical Design Guidelines...
Page 88: ...Thermal Interface Management 88 Thermal and Mechanical Design Guidelines...
Page 120: ...Legacy Fan Speed Control 120 Thermal and Mechanical Design Guidelines...
Page 126: ...Fan Performance for Reference Design 126 Thermal and Mechanical Design Guidelines...
Page 127: ...Fan Performance for Reference Design Thermal and Mechanical Design Guidelines 127...