# US 10,371,157 B2 · Smart fan and method for controlling the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,157 B2 - Document ID: US10371157B2 - Status: Granted - Kind: B2 - Application number: 15/786,620 - Filed: 2017-10-18 - Published: 2019-02-14 - Granted: 2019-08-06 - Earliest claimed: 2017-08-14 - Assignees: Fu Tai Hua Industry (Shenzhen) Co., Ltd.; Hon Hai Precision Industry Co., Ltd. - Applicants: Fu Tai Hua Industry (Shenzhen) Co., Ltd.; Hon Hai Precision Industry Co., Ltd. - Inventors: Chen-Jing Zhan; Xian Qian - Web page: https://patentgrep.com/patent/US10371157B2 ## CPC - F04D 25/08: the working fluid being air, e.g. for ventilation - F04D 25/0666: {a sensor is integrated into the pump/motor design} - F04D 27/004: {by varying driving speed} - G05D 23/1931: {to control the temperature of one space} - G05D 23/20: with sensing elements having variation of electric or magnetic properties with change of temperature (G05D23/13 takes precedence) - G05D 23/22: the sensing element being a thermocouple - G05D 23/24: the sensing element having a resistance varying with temperature, e.g. a thermistor - G05D 23/27: with sensing element responsive to radiation - H04L 12/2827: {Reporting to a device within the home network; wherein the reception of the information reported automatically triggers the execution of a home appliance functionality} - H04L 12/2829: {involving user profiles according to which the execution of a home appliance functionality is automatically triggered} - G01J 5/0025: {Living bodies (ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00)} - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A method for controlling rotational speed applied to a smart fan includes acquiring environmental temperature from a temperature sensor and radiation intensity of human body from an infrared sensor. A result of analysis is generated by determining whether the acquired environmental temperature is within a predetermined temperature range and the acquired radiation intensity is greater than a predetermined value. A working status of the smart fan can be changed according to the result when the smart fan is in automatic mode. ## Claims ### Claim 1 A smart fan comprising: a plurality of sensors comprising a temperature sensor and an infrared sensor, wherein the temperature sensor detects environmental temperature and the infrared sensor collects radiation intensity of human body; and a controller acquires the detected environmental temperature from the temperature sensor and the collected radiation intensity from the infrared sensor, wherein the controller increases rotational speed of the smart fan when the detected environmental temperature is within a predetermined temperature range, and the collected radiation intensity is equal to or less than a predetermined value; the controller decreases the rotational speed of the smart fan when the detected environmental temperature is within the predetermined temperature range and the collected radiation intensity is greater than the predetermined value; and the controller adjusts the rotational speed automatically according to the detected environmental temperature and the collected radiation intensity when the smart fan is in sleep mode. ### Claim 2 (depends on 1) The smart fan according to claim 1, wherein the controller increases the rotational speed of the smart fan when the detected environmental temperature is higher than a maximum temperature of the predetermined temperature range; and the controller turns off the smart fan when the detected environmental temperature is lower than a minimum temperature of the predetermined temperature range. ### Claim 3 (depends on 2) The smart fan according to claim 2, wherein the controller comprises a speed controller, which adjusts the rotational speed of the smart fan. ### Claim 4 (depends on 1) The smart fan according to claim 1, further comprising a battery, which supply electrical energy to the smart fan. ### Claim 5 A rotational speed controlling method applied in a smart fan, the smart fan comprises a temperature sensor and an infrared sensor, the method comprising: acquiring environmental temperature from the temperature sensor and radiation intensity of human body from the infrared sensor; increasing rotational speed of the smart fan by a speed controller of the smart fan when the acquired environmental temperature is within a predetermined temperature range, and the acquired radiation intensity is equal to or less than a predetermined value; decreasing the rotational speed of the smart fan by the speed controller when the acquired environmental temperature is within the predetermined temperature range and the acquired radiation intensity is greater than the predetermined value; and the controller adjusts the rotational speed automatically according to the detected environmental temperature and the collected radiation intensity when the smart fan is in sleep mode. ### Claim 6 (depends on 5) The rotational speed controlling method according to claim 5, further comprising: increasing the rotational speed of the smart fan by the speed controller when the acquired environmental temperature is higher than a maximum temperature of the predetermined temperature range; and turning off the smart fan when the acquired environmental temperature is lower than a minimum temperature of the predetermined temperature range.