Patent Publication Number: US-11638988-B2

Title: Electronic wrench and prompting method thereof

Description:
RELATED APPLICATIONS 
     This application claims priority to Taiwan Application Serial Number 109105898, filed Feb. 24, 2020, which is herein incorporated by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an electronic wrench and a prompting method thereof. More particularly, the present disclosure relates to an electronic wrench and a prompting method thereof applicable to clearly judge an interval of a torque value. 
     Description of Related Art 
     In general, most of electronic wrenches on the market have a function of sensing a torque value and an angle value. However, the torque value and the angle value are only numerically displayed on monitors of the electronic wrenches on the market. Hence, an interval of the torque value at the moment cannot be learned before a user carefully reads the torque value. 
     Hence, a development of an electronic wrench and a prompting method thereof, which can be configured to facilitate the user to judge the interval of the torque value via different numeric display formats, is a future trend of an industry thereof. 
     SUMMARY 
     According to one aspect of the present disclosure, an electronic wrench includes a main body, at least one sensing element, a processor and at least one prompting unit. The main body includes a working head. The sensing element is disposed on the main body, the sensing element is configured to sense a working status of the working head to generate a sensing signal, and the sensing signal includes at least one sensing information value. The processor is electrically connected to the sensing element, and the processor includes a first prompt lower limit value and a second prompt lower limit value. The prompting unit is electronically connected to the processor, and the prompting unit is configured to provide at least one working status prompt. When the sensing information value is less than or equal to the first prompt lower limit value, the working status prompt is visible in a first numeric display format, and a range of the first numeric display format has a first allowable error value. When the sensing information value is greater than the first prompt lower limit value and less than or equal to the second prompt lower limit value, the working status prompt is visible in a second numeric display format, and a range of the second numeric display format has a second allowable error value. The first numeric display format is different from the second numeric display format. 
     According to another aspect of the present disclosure, a prompting method of an electronic wrench includes an operating step, a sensing step and a comparing step. In the operating step, a working head of the electronic wrench is operated on a workpiece. In the sensing step, a working status of the working head is sensed via at least one sensing element to generate a sensing signal, and the sensing signal includes at least one sensing information value. 
     In the comparing step, the sensing information value is compared to a first prompt lower limit value and a second prompt lower limit value to provide a working status prompt. When the sensing information value is less than or equal to the first prompt lower limit value, the working status prompt is a first numeric display format, and a range of the first numeric display format has a first allowable error value. When the sensing information value is greater than the first prompt lower limit value and less than or equal to the second prompt lower limit value, the working status prompt is a second numeric display format, and a range of the second numeric display format has a second allowable error value. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a block diagram of an electronic wrench according to an embodiment of the present disclosure. 
         FIG.  2 A  is a schematic view of a first numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  2 B  is a schematic view of a second numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  2 C  is a schematic view of a third numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  3 A  is another schematic view of the first numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  3 B  is another schematic view of the second numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  3 C  is another schematic view of the third numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  4 A  is another schematic view of the first numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  4 B  is another schematic view of the second numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  4 C  is another schematic view of the third numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  5 A  is another schematic view of the first numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  5 B  is another schematic view of the second numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  5 C  is another schematic view of the third numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  6 A  is another schematic view of the first numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  6 B  is another schematic view of the second numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  6 C  is another schematic view of the third numeric display format of the electronic wrench according to the embodiment of  FIG.  1   . 
         FIG.  7    is a step flow chart of a prompting method of an electronic wrench according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIG.  1    is a block diagram of an electronic wrench  100  according to an embodiment of the present disclosure. In  FIG.  1   , the electronic wrench  100  includes a main body  110 , at least one sensing element  120 , a processor  130 , at least one prompting unit  140 , an input element  150  and a signal processing module  160 . 
     In detail, the main body  110  includes a working head  111 . The sensing element  120  is disposed on the main body  110 , and the sensing element  120  is configured to sense a working status of the working head  111  to generate a sensing signal. The sensing signal includes at least one sensing information value. The processor  130  is electrically connected to the sensing element  120 , and the processor  130  includes a first prompt lower limit value and a second prompt lower limit value. The prompting unit  140  is electronically connected to the processor  130 , and the prompting unit  140  is configured to provide at least one working status prompt. 
     The sensing element  120  at least can include an angle sensing element  121  or a torque sensing element  122 , and the sensing information value at least can include an angle sensing value or a torque sensing value. In particular, according to the embodiment of  FIG.  1   , the sensing element  120  includes the angle sensing element  121  and the torque sensing element  122 . That is, the angle sensing value and the torque sensing value can be provided via the electronic wrench  100 . 
     To provide a selecting function of the electronic wrench  100  for a user, the electronic wrench  100  can further include at least one of the input element  150  electronically connected to the processor  130 , wherein the input element  150  can be a physical button or a touch button. In particular, according to the embodiment of  FIG.  1   , the input element  150  can include a system function button  151  and a sensing function button  152 . The user can select a plurality of performing functions of the electronic wrench  100  via the system function button  151 , such as a turn-on status, a turn-off status, a standby status or a reset status. The system function button  151  can be composed of a single button or a plurality of buttons according to different demands. When the system function button  151  is composed of the plurality of buttons, the buttons can include a turn-on button (not shown), a turn-off button (not shown), a standby button (not shown) or a reset button (not shown). When the user presses the turn-off button, all power of the electronic wrench  100  is turned off via the processor  130  to transform to the turn-off status; when the user presses the standby button, a portion of the power of the electronic wrench  100  is turned off via the processor  130  to transform to the standby status; when the user presses the reset button, the electronic wrench  100  is reset via the processor  130  to resume to an initialization. The aforementioned functions of the buttons are not limited thereto. 
     The user can select a sensing function of the electronic wrench  100  via the sensing function button  152 , and then a hardware circuit is detected to perform the sensing function via the electronic wrench  100 , such as an angle sensing function or a torque sensing function. The sensing function button  152  can be composed of a single button or a plurality of buttons according to different functions. When the sensing function button  152  is composed of the plurality of buttons, the buttons can include an angle sensing button (not shown) or a torque sensing button (not shown). When the user presses the angle sensing button, an angel of the working head  111  is sensed via the sensing element  120  to generate the sensing signal; when the user presses the torque sensing button, a torque of the working head  111  is sensed via the sensing element  120  to generate the sensing signal. The aforementioned functions of the buttons are not limited thereto. 
     The signal processing module  160  is electronically connected to the processor  130  and the sensing element  120 . The sensing signal generated via the sensing element  120  is received and processed via the signal processing module  160 , and then the sensing signal processed is transferred to the processor  130 . The sensing signal can be an analog sensing signal or a digital sensing signal, and the signal processing module  160  can include a signal converter  161  and an amplifier (not shown). That is, when the sensing signal is the analog sensing signal, the sensing signal can be converted from the analog sensing signal to the digital sensing signal via the signal converter  161  and then transferred to the processor  130 , or the sensing signal can be amplified via the amplifier, the analog sensing signal is converted to the digital sensing signal via the signal converter  161 , and then the digital sensing signal is transferred to the processor  130 . 
     In detail, when the sensing information value is less than or equal to the first prompt lower limit value, the working status prompt is visible in a first numeric display format, and a range of the first numeric display format has a first allowable error value; when the sensing information value is greater than the first prompt lower limit value and less than or equal to the second prompt lower limit value, the working status prompt is visible in a second numeric display format, and a range of the second numeric display format has a second allowable error value. The first numeric display format is different from the second numeric display format. Therefore, the user can directly judge an interval of a torque value by a difference between the first numeric display format and the second numeric display format. 
     Further, the processor  130  can further include a prompt upper limit value. When the sensing information value is greater than the second prompt lower limit value and less than or equal to the prompt upper limit value, the working status prompt is visible in a third numeric display format. A range of the third numeric display format can have a third allowable error value, and the third numeric display format can be different from the first numeric display format and the second numeric display format value. In particular, the third allowable error value can be less than the second allowable error value, and the second allowable error value can be less than the first allowable error value. That is, a precision of the range of the third numeric display format is higher than a precision of a range of the second numeric display format, and the precision of the range of the second numeric display format is higher than a precision of a range of the first numeric display format. In detail, at least one of a font form, a font color, a background color, a font size and a font effect of the first numeric display format can be different from at least one of a font form, a font color, a background color, a font size and a font effect of the second numeric display format, the at least one of the font form, the font color, the background color, the font size and the font effect of the first numeric display format can be different from at least one of a font form, a font color, a background color, a font size and a font effect of the third numeric display format, and the at least one of the font form, the font color, the background color, the font size and the font effect of the second numeric display format can be different from the at least one of the font form, the font color, the background color, the font size and the font effect of the third numeric display format. The aforementioned differences are not limited thereto. Therefore, ranges of the first allowable error value, the second allowable error value and the third allowable error value and the interval of the torque value can be more clearly judged via a difference among the first numeric display format, the second numeric display format and the third numeric display format. The processor  130  can further include an operating value, wherein the operating value is a maximum torque value or a maximum angle value which can be borne by the electronic wrench  100 . 
     Moreover, the prompting unit  140  at least can include a liquid crystal display (LCD)  141 , a light-emitting diode (LED)  142 , an audio prompting unit  143  and a vibration prompting unit  144 . The first numeric display format, the second numeric display format and the third numeric display format can be discriminated from different digital font forms, different font colors, different font sizes or different font effects, and the different digital font forms, the different font colors, the different font sizes and the different font effects can be displayed via the LCD  141 . Alternatively, the first numeric display format, the second numeric display format and the third numeric display format can be discriminated from different background colors, and the different background colors can be displayed via the LED  142 . Simultaneously, the first numeric display format, the second numeric display format and the third numeric display format can be also discriminated from different audio frequencies, a different loudness, different vibration frequencies or a different vibration intensity, and the different audio frequencies, the different loudness, the different vibration frequencies and the different vibration intensity can be obtained via the audio prompting unit  143  and the vibration prompting unit  144 . Therefore, the breadth of application of the electronic wrench  100  of the present disclosure can be promoted. It should be mentioned that the user can select the working status prompt according to demand via the input element  150 , that is, a plurality of kinds of the working status prompt can be provided via the electronic wrench  100 . Hence, the user can choose every one of the kinds of the working status prompt, and the user can set up the working status prompt according to preference. 
       FIG.  2 A  is a schematic view of a first numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  2 B  is a schematic view of a second numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  2 C  is a schematic view of a third numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  3 A  is another schematic view of the first numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  3 B  is another schematic view of the second numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  3 C  is another schematic view of the third numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  4 A  is another schematic view of the first numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  4 B  is another schematic view of the second numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  4 C  is another schematic view of the third numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  5 A  is another schematic view of the first numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  5 B  is another schematic view of the second numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  5 C  is another schematic view of the third numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  6 A  is another schematic view of the first numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  6 B  is another schematic view of the second numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   .  FIG.  6 C  is another schematic view of the third numeric display format of the electronic wrench  100  according to the embodiment of  FIG.  1   . In  FIGS.  2 A to  2 C , the first numeric display format, the second numeric display format and the third numeric display format are discriminated from the different background colors. In  FIGS.  3 A to  3 C , the first numeric display format, the second numeric display format and the third numeric display format are discriminated from the different font forms. In  FIGS.  4 A to  4 C , the first numeric display format, the second numeric display format and the third numeric display format are discriminated from the different font colors. In  FIGS.  5 A to  5 C , the first numeric display format, the second numeric display format and the third numeric display format are discriminated from the different font sizes. In  FIGS.  6 A to  6 C , the first numeric display format, the second numeric display format and the third numeric display format are discriminated from the different font effects. 
     In detail, the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 30% of the operating value, or the second prompt lower limit value is between 5% to 10% of the operating value. The first prompt lower limit value, the second prompt lower limit value, the first allowable error value, the second allowable error value and the third allowable error value can be set via the user, and the prompt upper limit value can be set via the user or equal to the operating value. That is, the user can press the input element  150  to set up the first prompt lower limit value, the second prompt lower limit value, the prompt upper limit value, the first allowable error value, the second allowable error value and the third allowable error value via the input element  150  by repeatedly pressing. 
     In  FIGS.  2 A to  2 C , the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 10% of the operating value. For example, the operating value of the electronic wrench  100  is 100 Nm, a display value range of the first numeric display format is between 0 Nm to 5 Nm (i.e., greater than 0 Nm and less than or equal to 5 Nm), a display value range of the second numeric display format is between 5.1 Nm to 10 Nm (i.e., greater than 5 Nm and less than or equal to 10 Nm), and a display value range of the third numeric display format is between 10.1 Nm to 100 Nm (i.e., greater than 10 Nm and less than or equal to 100 Nm). The first allowable error value of the first numeric display format is ±7%, the second allowable error value of the second numeric display format is ±6%, and the third allowable error value of the third numeric display format is ±4%. The first allowable error value, the second allowable error value and the third allowable error value are verified according to the specification of ISO6789, and the display value range of the first numeric display format, the first allowable error value, the display value range of the second numeric display format, the second allowable error value, the display value range of the third numeric display format and the third allowable error value are not limited thereto. In particular, each of torque values according to the embodiments of  FIGS.  2 A to  2 C  is 3 Nm, 8 Nm and 35 Nm. The background color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  2 A , the background color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  2 B  and the background color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  2 C  are different. It should be mentioned that the different background colors according to the embodiments of  FIGS.  2 A to  2 C  are visible in different bottom lines. 
     In  FIGS.  3 A to  3 C , the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 30% of the operating value. For example, the operating value of the electronic wrench  100  is 100 Nm, a display value range of the first numeric display format is between 0 Nm to 5 Nm (i.e., greater than 0 Nm and less than or equal to 5 Nm), a display value range of the second numeric display format is between 5.1 Nm to 30 Nm (i.e., greater than 5 Nm and less than or equal to 30 Nm), and a display value range of the third numeric display format is between 30.1 Nm to 100 Nm (i.e., greater than 30 Nm and less than or equal to 100 Nm). The first allowable error value of the first numeric display format is ±7%, the second allowable error value of the second numeric display format is ±5%, and the third allowable error value of the third numeric display format is ±3%. The first allowable error value, the second allowable error value and the third allowable error value are verified according to the specification of ISO6789, and the display value range of the first numeric display format, the first allowable error value, the display value range of the second numeric display format, the second allowable error value, the display value range of the third numeric display format and the third allowable error value are not limited thereto. In particular, each of torque values according to the embodiments of  FIGS.  3 A to  3 C  is 2 Nm, 12 Nm and 40 Nm. The font form of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  3 A , the font form of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  3 B  and the font form of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  3 C  are different, wherein differences of the font forms can be visible in a boldface, an italics, an underline and a variation of a font, but the differences are not limited thereto. 
     In  FIGS.  4 A to  4 C , the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 10% of the operating value. For example, the operating value of the electronic wrench  100  is 100 Nm, a display value range of the first numeric display format is between 0 Nm to 5 Nm (i.e., greater than 0 Nm and less than or equal to 5 Nm), a display value range of the second numeric display format is between 5.1 Nm to 10 Nm (i.e., greater than 5 Nm and less than or equal to 10 Nm), and a display value range of the third numeric display format is between 10.1 Nm to 100 Nm (i.e., greater than 10 Nm and less than or equal to 100 Nm). The first allowable error value of the first numeric display format is ±10%, the second allowable error value of the second numeric display format is ±6%, and the third allowable error value of the third numeric display format is ±4%. The first allowable error value, the second allowable error value and the third allowable error value are verified according to the specification of ISO6789, and the display value range of the first numeric display format, the first allowable error value, the display value range of the second numeric display format, the second allowable error value, the display value range of the third numeric display format and the third allowable error value are not limited thereto. In particular, each of torque values according to the embodiments of  FIGS.  4 A to  4 C  is 4 Nm, 9 Nm and 70 Nm. The font color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  4 A , the font color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  4 B  and the font color of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  4 C  are different. 
     In  FIGS.  5 A to  5 C , the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 30% of the operating value. For example, the operating value of the electronic wrench  100  is 100 Nm, a display value range of the first numeric display format is between 0 Nm to 5 Nm (i.e., greater than 0 Nm and less than or equal to 5 Nm), a display value range of the second numeric display format is between 5.1 Nm to 30 Nm (i.e., greater than 5 Nm and less than or equal to 30 Nm), and a display value range of the third numeric display format is between 30.1 Nm to 100 Nm (i.e., greater than 30 Nm and less than or equal to 100 Nm). The first allowable error value of the first numeric display format is ±7%, the second allowable error value of the second numeric display format is ±6%, and the third allowable error value of the third numeric display format is ±4%. The first allowable error value, the second allowable error value and the third allowable error value are verified according to the specification of ISO6789, and the display value range of the first numeric display format, the first allowable error value, the display value range of the second numeric display format, the second allowable error value, the display value range of the third numeric display format and the third allowable error value are not limited thereto. In particular, each of torque values according to the embodiments of  FIGS.  5 A to  5 C  is 3 Nm, 27 Nm and 81 Nm. The font size of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  5 A , the font size of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  5 B  and the font size of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  5 C  are different. 
     In  FIGS.  6 A to  6 C , the first prompt lower limit value is less than or equal to 5% of the operating value, and the second prompt lower limit value is between 5% to 30% of the operating value. For example, the operating value of the electronic wrench  100  is 100 Nm, a display value range of the first numeric display format is between 0 Nm to 5 Nm (i.e., greater than 0 Nm and less than or equal to 5 Nm), a display value range of the second numeric display format is between 5.1 Nm to 30 Nm (i.e., greater than 5 Nm and less than or equal to 30 Nm), and a display value range of the third numeric display format is between 30.1 Nm to 100 Nm (i.e., greater than 30 Nm and less than or equal to 100 Nm). The first allowable error value of the first numeric display format is ±7%, the second allowable error value of the second numeric display format is ±6%, and the third allowable error value of the third numeric display format is ±4%. The first allowable error value, the second allowable error value and the third allowable error value are verified according to the specification of ISO6789, and the display value range of the first numeric display format, the first allowable error value, the display value range of the second numeric display format, the second allowable error value, the display value range of the third numeric display format and the third allowable error value are not limited thereto. In particular, each of torque values according to the embodiments of  FIGS.  6 A to  6 C  is 5 Nm, 21 Nm and 77 Nm. The font effect of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  6 A , the font effect of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  6 B  and the font effect of the LCD  141  of the prompting unit  140  according to the embodiment of  FIG.  6 C  are different, wherein differences of the font effects can be visible in resizing and swaying, but the differences are not limited thereto. 
     The processor  130  can further include a memory  131 , and the sensing information value, the first prompt lower limit value, the second prompt lower limit value and the prompt upper limit value can be saved via the memory  131 . Therefore, the memory  131  is favorable for the user to read a previous usage status when the user next uses the electronic wrench  100 . 
       FIG.  7    is a step flow chart of a prompting method of an electronic wrench S 200  according to an embodiment of the present disclosure, wherein the prompting method of the electronic wrench S 200  can be performed with the electronic wrench  100  according to the aforementioned embodiment of  FIG.  1   , but is not limited thereto. In  FIG.  7   , the prompting method of the electronic wrench S 200  includes an operating step S 201 , a sensing step S 202 , a comparing step S 203  and a saving step S 204 . 
     In the operating step S 201 , the working head  111  of the electronic wrench  100  is operated on a workpiece (not shown). In the sensing step S 202 , the working status of the working head  111  is sensed via the sensing element  120  to generate the sensing signal, and the sensing signal includes the sensing information value. In the comparing step S 203 , the sensing information value is compared to the first prompt lower limit value and the second prompt lower limit value to provide the working status prompt. When the sensing information value is less than or equal to the first prompt lower limit value, the working status prompt is the first numeric display format, and the range of the first numeric display format has the first allowable error value. When the sensing information value is greater than the first prompt lower limit value and less than or equal to the second prompt lower limit value, the working status prompt is the second numeric display format, and the range of the second numeric display format has the second allowable error value. 
     In the comparing step S 203 , the sensing information value can be further compared to the prompt upper limit value to provide the working status prompt. When the sensing information value is greater than the second prompt lower limit value and less than or equal to the prompt upper limit value, the working status prompt is the third numeric display format, and the range of the third numeric display format has the third allowable error value. 
     In the saving step S 204 , the sensing information value, the first prompt lower limit value, the second prompt lower limit value and the prompt upper limit value are saved via the memory  131  of the processor  130 . Therefore, the memory  131  is favorable for the user to read the previous usage status when the user next uses the electronic wrench  100 . 
     In detail, when the working head  111  of the electronic wrench  100  is operated on the workpiece, the working status of the working head  111  is sensed via the sensing element  120  and the sensing signal is generated, and the sensing signal is transferred to the processor  130 . The sensing signal can include the sensing information value, and the processor  130  can include the first prompt lower limit value, the second prompt lower limit value, the prompt upper limit value and the operating value, wherein the operating value is the maximum torque value or the maximum angle value which can be borne by the electronic wrench  100 . After the sensing signal received via the processor  130 , the sensing information value is compared to each of the first prompt lower limit value, the second prompt lower limit value and the prompt upper limit value via the processor  130 , and a comparing result is then generated. The working status prompt can be provided according to the comparing result via the prompting unit  140  to provide the user the working status of the working head  111 . 
     In the comparing step S 203 , the first prompt lower limit value and the second prompt lower limit value can be set via the user, and the prompt upper limit value can be set via the user or equal to the operating value. Further, the user can set up the first prompt lower limit value, the second prompt lower limit value and the prompt upper limit value via the input element  150  by repeatedly pressing. In detail, when the sensing information value is less than or equal to the first prompt lower limit value, the working status prompt is visible in the first numeric display format, and the range of the first numeric display format has the first allowable error value; when the sensing information value is greater than the first prompt lower limit value and less than or equal to the second prompt lower limit value, the working status prompt is visible in the second numeric display format, and the range of the second numeric display format has the second allowable error value; when the sensing information value is greater than the second prompt lower limit value and less than or equal to the prompt upper limit value, the working status prompt is visible in the third numeric display format, and the range of the third numeric display format has the third allowable error value. Moreover, at least one of the font form, the font color, the background color, the font size and the font effect of the first numeric display format can be different from at least one of the font form, the font color, the background color, the font size and the font effect of the second numeric display format, the at least one of the font form, the font color, the background color, the font size and the font effect of the first numeric display format can be different from at least one of the font form, the font color, the background color, the font size and the font effect of the third numeric display format, and the at least one of the font form, the font color, the background color, the font size and the font effect of the second numeric display format can be different from the at least one of the font form, the font color, the background color, the font size and the font effect of the third numeric display format, but the aforementioned display differences are not limited thereto. 
     In detail, the sensing information value is compared to each of the first prompt lower limit value, the second prompt lower limit value and the prompt upper limit value via the processor  130 , and the comparing result is then generated. Different working status prompts can be provided according to the comparing result via the prompting unit  140 . Therefore, the user can judge the working status of the working head  111  according to the different working status prompts. 
     In summary, an operating status of the electronic wrench can be clearly judged by the working status prompt provided by the electronic wrench and the prompting method thereof of the present disclosure. Moreover, not only is a visual difference obtained via the LCD and the LED of the prompting unit, but an auditory difference and a tactile difference can be obtained via the audio prompting unit and the vibration prompting unit of the prompting unit. The working status prompt of the electronic wrench can be set up according to the user&#39;s preference and a convenience. Therefore, the user can clearly judge the operating status of the electronic wrench, and the breadth of application of the electronic wrench can be extended. 
     The foregoing description, for purpose of explanation, has been described with reference to specific examples. It is to be noted that Tables show different data of the different examples; however, the data of the different examples are obtained from experiments. The examples were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various examples with various modifications as are suited to the particular use contemplated. The examples depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.