Pid Controller Fundamentals - Intel E2160 - Cpu Pentium Dual-Core 1.80Ghz Fsb800Mhz 1M Lga775 Tray Design Manual

Intel
Figure 14.

PID Controller Fundamentals

For a PID algorithm to work limit temperatures are assigned for each temperature
sensor. For Intel QST, the T
limit temperature. The ME will measure the error, slope and rate of change using the
equations below:
• Proportional Error (P) = TLIMIT - TACTUAL
• Integral (I) = Time averaged error
• Derivative (D) = ΔTemp / ΔTime
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)
® TM
Intel Core 2 Duo E6400, E4300, and Intel
TDG
40
® TM
Core 2 Duo E6400, E4300, and Intel
Integral (time averaged) Integral (time averaged) Integral (time averaged) Integral (time averaged)
Proportional Proportional Proportional Proportional
Error Error Error Error
CONTROL
® ®
Pentium Dual-Core E2160 Processor
® ®
Pentium Dual-Core E2160 Processor—Intel®
Quiet System Technology (Intel® QST)
Actual Actual
Temperature Temperature
Limit Limit
Temperature Temperature
Derivative (Slope) Derivative (Slope) Derivative (Slope) Derivative (Slope)
Time
Fan Fan
Speed Speed
for the processor and chipset are to be used as the
October 2007
Order Number:315279 -003US