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Inlet air temperature correction method based on rotation speed of fan

A technology of fan speed and correction coefficient, which is applied in the direction of temperature control by electric method and auxiliary controller with auxiliary heating device, etc., which can solve the problems of measurement accuracy influence and exceeding the allowable range

Inactive Publication Date: 2016-01-27
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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Problems solved by technology

Therefore, the measurement accuracy of the inlet air temperature is affected by the fan speed. The traditional correction method can only guarantee the accuracy of readings at individual fan speeds. When the fan speed changes, the deviation will easily exceed the allowable range.

Method used

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  • Inlet air temperature correction method based on rotation speed of fan

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Embodiment Construction

[0013] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0014] like figure 1 As shown, in the research and development stage, set different fan speeds, record the readings of the air inlet temperature sensor and the actual ambient temperature 1cm away from the air inlet at each fan speed, and calculate the difference between the two as the temperature correction coefficient. Write the corresponding relationship between fan speed and correction coefficient into bmc. The fan speed of the server is controlled by the fan control board, and the fan speed and the feedback value of the air inlet temperature sensor are obtained in real time through the bmc. After the bmc corrects the inlet air temperature through the correction coefficient corresponding to the fan speed, it outputs the correction value.

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Abstract

The invention provides an inlet air temperature correction method based on the rotation speed of a fan, and relates to the technical field of heat dissipation. The rotation speed of the fan of a server is controlled by a fan control panel. The rotation speed of the fan and the feedback value of an inlet air temperature sensor are acquired in real time through bmc. According to the rotation speed of the fan, a corresponding correction coefficient is selected to correct the feedback value, so as to improve the measuring accuracy of the ambient temperature. According to the method provided by the invention, the correction coefficient is determined by the rotation speed of the fan, so that the server can accurately monitor the ambient temperature under various conditions of the rotation speed of the fan.

Description

technical field [0001] The invention relates to the technical field of heat dissipation, in particular to a method for correcting inlet air temperature based on fan speed. Background technique [0002] In order to monitor the ambient temperature of the server in real time, a temperature sensor is often integrated on the motherboard near the air inlet. Due to the influence of motherboard heating and air reflow, the temperature sensor feedback value will be higher than the actual ambient temperature value. In order for the temperature sensor to truly reflect the ambient temperature, the feedback temperature value is usually corrected by the software based on the laboratory test results. The specific method is to subtract a fixed correction coefficient. According to the principle of aerodynamics, when the fan speed increases, the air volume increases, and the deviation between the reading value of the temperature sensor and the ambient temperature becomes smaller; when the fan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D23/30
Inventor 王聪
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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