Intel E2160 Design Guide - Page 40
Temperature, Actual
UPC - 735858199216
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Intel® CoreTM 2 Duo E6400, E4300, and Intel® Pentium® Dual-Core E2160 Processor-Intel® Quiet System Technology (Intel® QST) Figure 14. PID Controller Fundamentals Integral (time averaged) Actual Temperature Proportional Error Limit Temperature Temperature Derivative (Slope) + dPWM - dPWM Time Fan Speed RPM For a PID algorithm to work limit temperatures are assigned for each temperature sensor. For Intel QST, the TCONTROL 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 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: ΔPWM = -P*(Kp) - I*(Ki) + D*(Kd) Intel® CoreTM 2 Duo E6400, E4300, and Intel® Pentium® Dual-Core E2160 Processor TDG 40 October 2007 Order Number:315279 -003US