WO2019080361A1 - 一种吸油烟机的非接触控制装置及控制方法 - Google Patents

一种吸油烟机的非接触控制装置及控制方法

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Publication number
WO2019080361A1
WO2019080361A1 PCT/CN2018/000269 CN2018000269W WO2019080361A1 WO 2019080361 A1 WO2019080361 A1 WO 2019080361A1 CN 2018000269 W CN2018000269 W CN 2018000269W WO 2019080361 A1 WO2019080361 A1 WO 2019080361A1
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WIPO (PCT)
Prior art keywords
infrared
signal
gesture sensing
devices
sensing devices
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PCT/CN2018/000269
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English (en)
French (fr)
Inventor
占德友
邱骁哲
王磊
茅忠群
诸永定
方献良
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宁波方太厨具有限公司
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Application filed by 宁波方太厨具有限公司 filed Critical 宁波方太厨具有限公司
Priority to US16/758,872 priority Critical patent/US11473782B2/en
Priority to AU2018357671A priority patent/AU2018357671B2/en
Priority to CA3079482A priority patent/CA3079482C/en
Publication of WO2019080361A1 publication Critical patent/WO2019080361A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2078—Removing cooking fumes movable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B15/00—Systems controlled by a computer
    • G05B15/02—Systems controlled by a computer electric
    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
    • G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared

Definitions

  • the invention relates to a non-contact control device and a control method for a range hood.
  • control distance is basically controlled by controlling the intensity of the infrared signal, and the speed of the gesture sliding is controlled to avoid human interference, especially the head. Ministry of interference.
  • the gesture of waving left and right is simply determined according to the chronological order in which the signals are received by different infrared receiving devices.
  • control methods also lack a scientific design for the position distribution of the infrared transceiver. For an unscientific distribution, a group of infrared receivers may receive signals from other groups of infrared emitters, in which case the signal is received. It is easy to make a false positive judgment by sequentially determining the operation gesture.
  • the control method in the prior art does not really analyze the difference between the gesture operation and the interference signal, and judges the validity of the detection signal, which is difficult to apply.
  • the primary technical problem to be solved by the present invention is to provide a non-contact control device for a range hood that can control the sensing distance without weakening the intensity of the infrared signal.
  • a further technical problem to be solved by the present invention is to provide a control method for a non-contact control device capable of controlling a sensing range without weakening the intensity of an infrared signal while accurately distinguishing between a gesture signal and a head interference signal.
  • a non-contact control device for a range hood comprising two sets of infrared gesture sensing devices disposed on the casing of the range hood, and connected with two sets of infrared gesture sensing devices
  • the detection signal analysis device records the two sets of infrared gesture sensing devices as a group of infrared gesture sensing devices and a group b infrared gesture sensing device; each group of infrared gesture sensing devices includes an infrared receiving device and at least one infrared emitting device, each The infrared receiving device and all the infrared transmitting devices in the infrared gesture sensing device are connected to the detecting signal analyzing device, wherein the distance L between the infrared receiving devices in the two sets of infrared gesture sensing devices satisfies:
  • W_min is the minimum value of the hand width
  • W_min is a preset constant greater than 50 mm
  • W_max is the maximum value of the hand width
  • W_max is a preset constant less than 200 mm
  • ⁇ is a group of infrared gesture sensing devices in the vicinity of the b group infrared The maximum infrared signal emission angle in the direction of the gesture sensing device
  • ⁇ is the maximum infrared signal receiving angle of the group b infrared gesture sensing device in the direction of the group a infrared gesture sensing device
  • H is the preset maximum should distance.
  • a straight line is formed between two infrared receiving devices in the two sets of infrared gesture sensing devices, and the straight line direction is a gesture operation direction.
  • Each group of infrared gesture sensing devices includes a plurality of infrared emitting devices, and the plurality of infrared emitting devices are distributed in a circle having a center of the infrared receiving device and a radius of less than 30 m.
  • an infrared light separating plate is disposed between the infrared receiving device and the plurality of infrared emitting devices.
  • the infrared receiving device and the plurality of infrared emitting devices are provided with filters for filtering ambient light.
  • the technical solution adopted by the present invention to solve the above further technical problem is: a control method of a non-contact control device of a range hood having the above structure, characterized in that: the detection signal analysis device enables two sets of infrared gesture sensing devices to work simultaneously, And output the control signal by the following steps:
  • the detection signal analysis device reads the detection results of the two infrared receiving devices, and if the two infrared receiving devices simultaneously detect the infrared signal, the detection signal analysis device outputs an invalid control signal;
  • the detecting signal analyzing device records the duration of the infrared receiving device receiving the infrared signal, and when the duration is greater than the first preset value, the detecting signal analyzing device uses the infrared receiving device Receiving the infrared signal as a specific effective signal, if the duration is less than the first preset value, the detection signal analyzing device receives the infrared signal as the noise signal;
  • S3 On the basis of S2, if the detection signal analysis device determines that the infrared signal received by the infrared receiving device in the group a infrared gesture sensing device is a specific valid signal, the timing is started, and the timing duration is represented by the parameter T_a, if T_a exceeds the second setting. The fixed value, the detection signal analysis device outputs an invalid control signal, T_a is reset to zero; if T_a does not exceed the second predetermined value, the detection signal analysis device determines whether the infrared signal received by the infrared receiving device in the b group infrared gesture sensing device is specifically valid.
  • the signal if yes, starts timing, the timing duration is represented by the parameter T_b, if T_b exceeds the second set value, the detection signal analysis device outputs an invalid control signal, T_b is reset to zero, and if T_b does not exceed the second predetermined value, the detection signal is analyzed.
  • the device continues to determine whether the number of times the infrared signal is received as a noise signal in the two sets of infrared gesture sensing devices exceeds a preset tolerance number.
  • detection signal analysis device If the number of occurrences of the noise signal in the infrared signal received by any one of the infrared gesture sensing devices exceeds the preset tolerance Number of times, detection signal analysis device output invalid control Signal; if the number of times that the infrared signal is received as the noise signal in the two sets of infrared gesture sensing devices does not exceed the preset tolerance number, the detection signal analysis device continues to determine whether T_a is greater than T_b, and if so, the detection signal analysis device outputs the first gesture The control signal; if T_a is smaller than T_b, the detection signal analyzing means outputs the second gesture control signal.
  • the validity of the detection signal can be effectively judged, the gesture operation signal and the head interference signal can be accurately distinguished, and the control functions such as opening, closing or speed regulation of the range hood can be accurately controlled for the subsequent output gesture signal. basis.
  • the invention has the advantages that: by designing the position between the two sets of infrared gesture sensing devices, the user gesture sensing distance does not need to be controlled according to the intensity of the infrared emission signal, so that the infrared emission signal intensity adjustment can be facilitated. It is ensured that the infrared receiving device can better detect the infrared signal, and at the same time, the gesture operation signals within the maximum sensing distance can not interfere with each other.
  • FIG. 1 is a schematic view showing the structure of a non-contact control device of a range hood installed on a range hood according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a non-contact control device of a range hood according to an embodiment of the present invention.
  • Fig. 3 is a flow chart showing the control of the non-contact control device of the range hood according to the embodiment of the present invention.
  • the non-contact control device of the range hood shown in Figures 1 and 2 includes two sets of infrared gesture sensing devices disposed on the front surface of the range hood 6 (for European-style hoods, two sets of infrared gesture sensing devices can be set in the set
  • the hood front control panel is respectively recorded as a group infrared gesture sensing device A and b group infrared gesture sensing device B, and a detection signal analyzing device 3 connected to two sets of infrared gesture sensing devices, a group infrared gesture sensing device A
  • the infrared gesture sensing device B is the same as the infrared sensing device B of the b group, and includes an infrared receiving device 1 and at least one infrared emitting device 2.
  • the two sets of infrared gesture sensing devices each include an infrared receiving device 1 and an infrared emitting device 2,
  • the infrared receiving device and the plurality of infrared emitting devices have an infrared light separating plate 4, and the front surface of the range hood has a mounting hole for respectively installing the infrared gesture sensing device, and the outer casing of the range hood outside the mounting hole is made of an opaque material.
  • the infrared emitting device 2 in each group of infrared gesture sensing devices can be set a plurality of, for example, three, four, five, six, etc., a plurality of infrared emitting devices 2 are distributed in a circle having a center of the infrared receiving device 1 and a radius of less than 30 m, and each group of infrared gesture sensing devices can To better signal detection performance; the infrared receiving device 1 and the infrared transmitting device 2 in each group of infrared gesture sensing devices are connected to the detection signal analyzing device 3, and the distance between the infrared receiving devices in the two infrared gesture sensing devices is L. Satisfy:
  • W_min is the minimum value of the hand width
  • W_min is a preset constant greater than 50 mm
  • W_max is the maximum value of the hand width
  • W_max is a preset constant less than 200 mm
  • ⁇ is a group of infrared gesture sensing devices in the vicinity of the b group infrared The maximum infrared signal emission angle in the direction of the gesture sensing device
  • ⁇ is the maximum infrared signal receiving angle of the group b infrared gesture sensing device in the direction of the group a infrared gesture sensing device.
  • H is the preset maximum possible distance.
  • the center of the two infrared receiving devices forms a straight line, which is the direction of the gesture operation.
  • the sensing distance is not controlled according to the intensity of the infrared emission signal, which facilitates the adjustment of the intensity of the infrared emission signal, ensures that the infrared receiving device can better detect the infrared signal, and can also realize the gesture operation signal within the maximum sensing distance. Interfere with each other.
  • the control method of the non-contact control device of the above range hood is: the detection signal analysis device enables two sets of infrared gesture sensing devices to work simultaneously, and outputs a control signal by the following steps, as shown in FIG. 3:
  • the detection signal analysis device reads the detection results of the two infrared receiving devices. If the two infrared receiving devices simultaneously detect the infrared signal, it is determined that the signal exceeding the maximum sensing distance or an object larger than W_max (such as the head) is caused. Interference signal, the detection signal analysis device outputs an invalid control signal;
  • the detecting signal analyzing device records the duration of the infrared receiving device receiving the infrared signal, and when the duration is greater than the first preset value, the detecting signal analyzing device uses the infrared receiving device The received infrared signal is a specific effective signal. If the duration is less than the first preset value, the detection signal analyzing device receives the infrared signal as the noise signal:
  • S3 On the basis of S2, if the detection signal analysis device determines that the infrared signal received by the infrared receiving device in the group a infrared gesture sensing device is a specific valid signal, the timing is started, and the timing duration is represented by the parameter T_a, if T_a exceeds the second setting. The fixed value, the detection signal analysis device outputs an invalid control signal, T_a is reset to zero; if T_a does not exceed the second predetermined value, the detection signal analysis device determines whether the infrared signal received by the infrared receiving device in the b group infrared gesture sensing device is specifically valid.
  • the signal if yes, starts timing, the timing duration is represented by the parameter T_b, if T_b exceeds the second set value, the detection signal analysis device outputs an invalid control signal, T_b is reset to zero, and if T_b does not exceed the second predetermined value, the detection signal is analyzed.
  • the device continues to determine whether the number of times the infrared signal is received as a noise signal in the two sets of infrared gesture sensing devices exceeds a preset tolerance number.
  • the detection signal analysis device If the number of occurrences of the noise signal in the infrared signal received by any one of the infrared gesture sensing devices exceeds the preset tolerance The number of times, it is judged that the signal quality is poor, generally The signal returned by the irregular and uneven object, the detection signal analysis device outputs an invalid control signal; if the number of times the infrared signal is received by the two sets of infrared gesture sensing devices is less than the preset tolerance number, the detection signal The analysis device continues to determine whether T_a is greater than T_b, and if so, the detection signal analysis device outputs a first gesture control signal; if T_a is less than T_b, the detection signal analysis device outputs a second gesture control signal.
  • the range hood can output two gesture control signals according to the detection signal analysis device to control the fan speed and the switch machine.

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Abstract

一种吸油烟机的非接触控制装置及控制方法，其中非接触控制装置包括设置在吸油烟机外壳（6）上的两组红外手势感应装置（A，B）及检测信号分析装置（3），每组红外手势感应装置（A，B）包括有一个红外接收装置（1）和至少一个红外发射装置（2），两组红外手势感应装置（A，B）中的红外接收装置（1）之间的距离L满足：H*tan(θ)+H*tan(β)+W_min＜L＜H*tan(θ)+H*tan(β)+W_max。用户手势感应距离不需要根据红外发射信号的强度进行控制，可以方便红外发射信号强度调节，保证红外接收装置（1）能更好地检测到红外信号，并且在最大感应距离内的手势操作信号不会相互干扰。

Description

一种吸油烟机的非接触控制装置及控制方法 技术领域
本发明涉及一种吸油烟机的非接触控制装置及控制方法。
背景技术
目前，市场上的大部分油烟机都是通过接触式进行操作的，但是由于厨房工作的特殊环境，当用户手上沾满油渍或面粉，或者干净的手不乐意去操作覆盖油渍的按键的时候，接触式操作对于厨房电器的用户带来了许多烦恼。
现有技术中，虽然已经有一些利用红外信号的非接触控制的油烟机控制方法，但基本都是通过控制红外信号的强度控制感应距离，同时控制手势滑动的速度来避免人体干扰，尤其是头部的干扰。另外，对于左右挥动的手势则简单的根据不同红外接收装置接收到信号的时间先后顺序判断。这些控制方法对于红外收发装置的位置分布也缺少科学的设计，对于不科学的分布可能导致一组红外接收装置接收到其他多组红外发射装置发射的信号，这种情况下根据接收到信号的时间先后顺序判断操作手势则容易产生误判。同时现有技术中的控制方法也没有真正分析手势操作和干扰信号的差异，判断检测信号的有效性，应用困难。
发明内容
本发明所要解决的首要技术问题是针对上述现有技术提供一种在不减弱红外信号强度情况下能控制感应距离的吸油烟机的非接触控制装置。
本发明进一步所要解决的技术问题是提供一种在不减弱红外信号强度情况下能控制感应距离的吸油烟机、同时还能准确区分手势信号和头部干扰信号的非接触控制装置的控制方法。
本发明解决上述技术问题所采用的技术方案为；一种吸油烟机的非接触控制装置，包括设置在吸油烟机外壳上的两组红外手势感应装置，及与两组红外手势感应装置连接的检测信号分析装置，将其两组红外手势感应装置分别记为a组红外手势感应装置和b组红外手势感应装置；每组红外手势感应装置包括有一个红外接收装置和至少一个红外发射装置，每组红外手势感应装置中的红外接收装置和所有的红外发射装置均与检测信号分析装置连接，其特征在于：两组红外手势感应装置中的红外接收装置之间的距离L满足：
H*tan(θ)+H*tan(β)+W_min＜L＜H*tan(θ)+H*tan(β)+W_max；
其中，W_min为人手宽度的最小值，W_min取大于50mm中的预设常数，W_max为人手宽度的最大值，W_max取小于200mm的预设常数；θ为a组红外手势感应装置在靠近b组红外手势感应装置方向的最大红外信号发射角度，β为b组红外手势感应装置在靠近a组红外手势感应装置方向的最大红外信号接收角度，H为预设的最大应该距离。
2组红外手势感应装置中的两个红外接收装置之间形成一条直线，该直线方向为手势操作方向。
每组红外手势感应装置中包括多个红外发射装置，多个红外发射装置分布在以红外接收装置为圆心，半径小于30m的圆内。
每组红外手势感应装置中，红外接收装置和多个红外发射装置之间具有红外光隔离板。
每组红外手势感应装置中，红外接收装置和多个红外发射装置外设有过滤环境光的滤光片。
本发明解决上述进一步技术问题所采用的技术方案为：一种具有上述结构的吸油烟机的非接触控制装置的控制方法，其特征在于：检测信号分析装置使两组红外手势感应装置同时工作，并通过如下步骤输出控制信号：
S1：检测信号分析装置读取两个红外接收装置的检测结果，如果两个红外接收装置同时检测到红外信号，检测信号分析装置输出无效控制信号；
S2：如果只有一个红外接收装置检测到红外信号，检测信号分析装置记录该红外接收装置接收到红外信号的持续时间，当持续时间大于第一预设值时，检测信号分析装置将该红外接收装置接收到的红外信号作为特定有效信号，如果持续时间小于第一预设值，检测信号分析装置将该红外接收装置接收到红外信号作为噪声信号；
S3：在S2基础上，如果检测信号分析装置判断a组红外手势感应装置中的红外接收装置接收的红外信号为特定有效信号，开始计时，计时持续时间用参数T_a表示，如果T_a超过第二设定值，检测信号分析装置输出无效控制信号，T_a复位清零；如果T_a没有超过第二预定值，检测信号分析装置判断b组红外手势感应装置中的红外接收装置接收的红外信号是否为特定有效信号，如是，开始计时，计时持续时间用参数T_b表示，如果T_b超过第二设定值，检测信号分析装置输出无效控制信号，T_b复位清零，如果T_b没有超过第二预定值，检测信号分析装置继续判断两组红外手势感应装置中接收到红外信号为噪声信号的次数是否均超过预设容忍次数，如果任意一组红外手势感应装置中接收到红外信号中出现噪声信号的次数超过预设容忍次数，检测信号分析装置输出无效控制信号；如果两组红外手势感应装置中接收到红外信号为噪声信号的次数均没有超过预设容忍次数，则检测信号分析装置输继续判断T_a是否大于T_b，若是，检测信号分析装置输出第一手势控制信号；如果T_a小于T_b，检测信号分析装置输出第二手势控制信号。
通过上述控制方法，能有效判断检测信号的有效性，准确区分手势操作信号和头部干扰信号，为后续用输出的手势信号实现油烟机的开、关机或者调速等控制功能打好准确的控制基础。
与现有技术相比，本发明的优点在于：通过两组红外手势感应装置之间位置的设计，用户手势感应距离不需要根据红外发射信号的强度进行控制，这样可以方便红外发射信号强度调节，保证红外接收装置能更好地检测到红外信号，同时还能实现在最大感应距离内的手势操作信号不会相互干扰。
附图说明
图1为本发明实施例中吸油烟机的非接触控制装置安装在油烟机上的结构示意图。
图2为本发明实施例中吸油烟机的非接触控制装置的结构示意图。
图3为本发明实施例中吸油烟机的非接触控制装置的控制流程图。
具体实施方式
以下结合附图实施例对本发明作进一步详细描述。
如图1、2所示的吸油烟机的非接触控制装置，包括设置在吸油烟机外壳6正面上的两组红外手势感应装置(对于欧式油烟机，两组红外手势感应装置可以设置在集烟罩正面控制板上)，分别记为a组红外手势感应装置A和b组红外手势感应装置B，及与两组红外手势感应装置连接的检测信号分析装置3，a组红外手势感应装置A和b组红外手势感应装置B结构相同，均包括一个红外接收装置1和至少一个红外发射装置2，本实施例中两组红外手势感应装置均包含一个红外接收装置1和一个红外发射装置2，红外接收装置和多个红外发射装置之间具有红外光隔离板4，吸油烟机外壳正面开有分别安装组红外手势感应装置的安装孔，安装孔外的吸油烟机外壳为不透光材质制成：安装孔的外表面设有过滤环境光的滤光片5：另外，每组红外手势感应装置中的红外发射装置2可以设置成多个，如3个、4个、5个、6个等，多个红外发射装置2分布在以红外接收装置1为圆心，半径小于30m的圆内，每组红外手势感应装置中，可以起到更好的信号检测性能；每组红外手势感应装置中的红外接收装置1和红外发射装置2均与检测信号分析装置3连接，两组红外手势感应装置中的红外接收装置之间的距离L满足：
H*tan(θ)+H*tan(β)+W_min＜L＜H*tan(θ)+H*tan(β)+W_max；
其中，W_min为人手宽度的最小值，W_min取大于50mm中的预设常数，W_max为人手宽度的最大值，W_max取小于200mm的预设常数；θ为a组红外手势感应装置在靠近b组红外手势感应装置方向的最大红外信号发射角度，β为b组红外手势感应装置在靠近a组红外手势感应装置方向的最大红外信号接收角度，当两组红外手势感应装置在油 烟机上安装好以后，由于油烟机上用于安装红外手势感应装置的安装孔是固定的，θ和β的值是可以测量出来的：H为预设的最大应该距离。
2个红外接收装置中心形成一条直线，该直线方向为手势操作方向。通过该分布设计，感应距离不根据红外发射信号的强度控制，方便红外发射信号强度的调节，保证红外接收装置更好的检测红外信号，同时还能实现在最大感应距离内的手势操作信号不会相互干扰。
上述吸油烟机的非接触控制装置的控制方法为：检测信号分析装置使两组红外手势感应装置同时工作，并通过如下步骤输出控制信号，参见图3所示：
S1：检测信号分析装置读取两个红外接收装置的检测结果，如果两个红外接收装置同时检测到红外信号，则判断为超过最大感应距离的信号或者大于W_max的物体(如头部)造成的干扰信号，检测信号分析装置输出无效控制信号；
S2：如果只有一个红外接收装置检测到红外信号，检测信号分析装置记录该红外接收装置接收到红外信号的持续时间，当持续时间大于第一预设值时，检测信号分析装置将该红外接收装置接收到的红外信号作为特定有效信号，如果持续时间小于第一预设值，检测信号分析装置将该红外接收装置接收到红外信号作为噪声信号：
S3：在S2基础上，如果检测信号分析装置判断a组红外手势感应装置中的红外接收装置接收的红外信号为特定有效信号，开始计时，计时持续时间用参数T_a表示，如果T_a超过第二设定值，检测信号分析装置输出无效控制信号，T_a复位清零；如果T_a没有超过第二预定值，检测信号分析装置判断b组红外手势感应装置中的红外接收装置接收的红外信号是否为特定有效信号，如是，开始计时，计时持续时间用参数T_b表示，如果T_b超过第二设定值，检测信号分析装置输出无效控制信号，T_b复位清零，如果T_b没有超过第二预定值，检测信号分析装置继续判断两组红外手势感应装置中接收到红外信号为噪声信号的次数是否均超过预设容忍次数，如果任意一组红外手势感应装置中接收到红外信号中出现噪声信号的次数超过预设容忍次数，则判断为信号质量差，一般为头部等不规则、不平整的物体返回的信号，检测信号分析装置输出无效控制信号；如果两组红外手势感应装置中接收到红外信号为噪声信号的次数均没有超过预设容忍次数，则检测信号分析装置输继续判断T_a是否大于T_b，若是，检测信号分析装置输出第一手势控制信号；如果T_a小于T_b，检测信号分析装置输出第二手势控制信号。油烟机则可以根据检测信号分析装置输出两个手势控制信号对风机转速、开关机进行控制。

Claims (5)

  1. 一种吸油烟机的非接触控制装置，包括设置在吸油烟机外壳上的两组红外手势感应装置，及与两组红外手势感应装置连接的检测信号分析装置，将其两组红外手势感应装置分别记为a组红外手势感应装置和b组红外手势感应装置；
    每组红外手势感应装置包括有一个红外接收装置和至少一个红外发射装置，每组红外手势感应装置中的红外接收装置和所有的红外发射装置均与检测信号分析装置连接，其特征在于：
    两组红外手势感应装置中的红外接收装置之间的距离L满足：
    H*tan(θ)+H*tan(β)+W_min＜L＜H*tan(θ)+H*tan(a)+W_max；
    其中，W_min为人手宽度的最小值，W_min取大于50mm中的预设常数，W_max为人手宽度的最大值，W_max取小于200mm的预设常数；θ为a组红外手势感应装置在靠近b组红外手势感应装置方向的最大红外信号发射角度，β为b组红外手势感应装置在靠近a组红外手势感应装置方向的最大红外信号接收角度，H为预设的最大应该距离。
  2. 根据权利要求1所述的吸油烟机的非接触控制装置，其特征在于：每组红外手势感应装置中包括多个红外发射装置，多个红外发射装置分布在以红外接收装置为圆心，半径小于30m的圆内。
  3. 根据权利要求2所述的吸油烟机的非接触控制装置，其特征在于，每组红外手势感应装置中，红外接收装置和多个红外发射装置之间具有红外光隔离板。
  4. 根据权利要求1所述的吸油烟机的非接触控制装置，其特征在于：每组红外手势感应装置中，红外接收装置和多个红外发射装置外设有过滤环境光的滤光片。
  5. 一种如权利要求1所述的吸油烟机的非接触控制装置的控制方法，其特征在于：检测信号分析装置使两组红外手势感应装置同时工作，并通过如下步骤输出控制信号：
    S1：检测信号分析装置读取两个红外接收装置的检测结果，如果两个红外接收装置同时检测到红外信号，检测信号分析装置输出无效控制信号；
    S2：如果只有一个红外接收装置检测到红外信号，检测信号分析装置记录该红外接收装置接收到红外信号的持续时间，当持续时间大于第一预设值时，检测信号分析装置将该红外接收装置接收到的红外信号作为特定有效信号，如果持续时间小于第一预设值，检测信号分析装置将该红外接收装置接收到红外信号作为噪声信号；
    S3：在S2基础上，如果检测信号分析装置判断a组红外手势感应装置中的红外接收装置接收的红外信号为特定有效信号，开始计时，计时持续时间用参数T_a表示，如果T_a超过第二设定值，检测信号分析装置输出无效控制信号，T_a复位清零；如果T_a没有超过第二预定值，检测信号分析装置判断b组红外手势感应装置中的红外接收装置接收的红外信号是否为特定有效信号，如是，开始计时，计时持续时间用参数T_b表示，如果T_b超过第二设定值，检测信号分析装置输出无效控制信号，T_b复位清零，如果 T_b没有超过第二预定值，检测信号分析装置继续判断两组红外手势感应装置中接收到红外信号为噪声信号的次数是否均超过预设容忍次数，如果任意一组红外手势感应装置中接收到红外信号中出现噪声信号的次数超过预设容忍次数，检测信号分析装置输出无效控制信号；如果两组红外手势感应装置中接收到红外信号为噪声信号的次数均没有超过预设容忍次数，则检测信号分析装置输继续判断T_a是否大于T_b，若是，检测信号分析装置输出第一手势控制信号；如果T_a小于T_b，检测信号分析装置输出第二手势控制信号。
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