A finger pinch prevention control method for household appliances

Abstract

The present invention discloses a finger pinching prevention control method for household appliances. During the closing process of a flap, the voltage and speed are gradually reduced to reduce the inertia force of the flap, and the voltage is then gradually increased in the reverse direction to perform a flip deceleration control to stop the flap at a position where finger pinching may easily occur, and an alarm is sounded to remind the user. After a preset time interval, the flap is controlled to complete the closing movement to move the flap to the closed position, thereby preventing fingers from being pinched, thereby effectively improving the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a hand pinching prevention control method for household appliances. Background Art

[0002] In the related art, most high-end steam-bake machines use a flap mechanism to flip the display operation panel upwards for user convenience. The existing flap structure is generally driven by a reduction DC motor. When the user's operation is completed, the flap is automatically retracted. During the automatic retraction process, it is possible that a child or user's fingers are placed on the closed position of the flap, which may cause the fingers to be pinched, thereby affecting the user experience. The common control method is to stop the power supply to the motor after detecting a certain distance, and the flap is stopped by the self-locking force of the motor itself, while reminding the user to prevent pinching. However, this control method has certain risks. When the weight of the flap is large, or the motor speed is too fast and the self-locking force is insufficient, it may not be possible to completely stop the flipping movement of the flap, which may cause the user's fingers to be pinched, thereby affecting the user experience. Summary of the invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a finger pinching prevention control method for household appliances. The method is simple and practical. During the flap closing process, the flap can be stopped at a position forward of the closing position and an alarm can be issued to remind the user, thereby preventing fingers from being pinched.

[0004] The above purpose is achieved through the following technical solutions:

[0005] A finger pinch prevention control method for household appliances, the finger pinch prevention control method comprising the following steps:

[0006] In the startup phase, when the flap receives a closing signal, the MCU control module drives the flap to move forward to close the flap;

[0007] In the deceleration stage, the MCU control module adjusts the running speed of the motor to reduce the running speed of the flap motor;

[0008] During the braking phase, the MCU control module drives the flap to move in the reverse direction until the flap stops closing;

[0009] In the alarm phase, an alarm is issued to remind the user;

[0010] In the closing stage, after a preset time interval, the MCU control module drives the flap to move forward to complete the closing movement of the flap.

[0011] In some embodiments, during the startup phase, the step in which the MCU control module drives the flap to move forward to close the flap includes:

[0012] The MCU control module controls the forward output voltage of the driving IC module, and at the same time, the MCU control module outputs a PWM signal with a duty cycle of 100% to drive the flap to move forward.

[0013] In some embodiments, during the deceleration stage, the step in which the MCU control module adjusts the running speed of the motor to reduce the running speed of the flap motor includes:

[0014] The MCU control module reduces the duty cycle of the PWM signal and gradually reduces the output voltage of the driver IC module to gradually reduce the operating speed of the flap motor.

[0015] In some embodiments, during the braking stage, the step in which the MCU control module drives the flap to move in the reverse direction until the flap stops closing includes:

[0016] The MCU control module controls the reverse output voltage of the driving IC module, and at the same time the MCU control module outputs a PWM signal and gradually increases the duty cycle from zero to drive the flap to move in the reverse direction;

[0017] The reverse driving force interacts with the inertia force to stop the flap motor from working, thereby stopping the flap from closing.

[0018] In some embodiments, the step of the MCU control module controlling the flap to complete the closing movement includes:

[0019] The MCU control module controls the driving IC module to output a positive voltage to drive the flap to move in a positive direction, thereby completing the closing movement of the flap.

[0020] In some embodiments, the preset duration of the startup phase is 1S to 3S, the preset duration of the deceleration phase is 2S to 4S, the preset duration of the braking phase is 1S, the preset duration of the alarm phase is 2S to 3S, and the preset duration of the closing phase is 1S.

[0021] In some embodiments, a forward transistor and a reverse transistor are also included, wherein when the driver IC module outputs a forward voltage, the current flows through the FO pin of the driver IC, the forward transistor, the flip motor, and the BO pin of the driver IC in sequence to drive the flip motor to run forward; when the driver IC module outputs a reverse voltage, the current flows through the BO pin of the driver IC, the flip motor, the reverse transistor, and the FO pin of the driver IC in sequence to drive the flip motor to run reversely.

[0022] In some embodiments, the step of issuing an alarm to remind the user includes:

[0023] The MCU control module controls the buzzer to output a signal to sound an alarm, thereby reminding the user to prevent pinching of the hand.

[0024] Compared with the prior art, the present invention has at least the following beneficial effects:

[0025] 1. The anti-pinch control method for household appliances of the present invention is simple and practical. During the closing process of the flap, the flap can be stopped at a position in front of the closing position and an alarm can be issued to remind the user, thereby preventing fingers from being pinched. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 1 is a flow chart of a finger pinch prevention control method according to an embodiment of the present invention;

[0027] Figure 2 is a circuit diagram of a finger pinch prevention control circuit in an embodiment of the present invention;

[0028] Figure 3 It is a curve diagram of the voltage change of the finger pinch protection control circuit in the embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of the technical solution for protection of the present invention.

[0030] Embodiment 1:

[0031] like Figures 1 to 3As shown, this embodiment provides a finger pinch prevention control method for household appliances. During the flap closing process, the voltage and speed are gradually reduced to reduce the inertia force of the flap, and then the voltage is gradually increased in the reverse direction to perform flip deceleration control to stop the flap at a position where finger pinching may easily occur, and an alarm is issued to remind the user. After a preset time interval, the flap is controlled to complete the closing movement to move the flap to the closed position, thereby preventing fingers from being pinched, thereby effectively improving the user experience.

[0032] In the present embodiment, the household appliance is a steamer, a steam oven, a microwave steamer, a microwave steam oven, a steam-oven combination machine or a dishwasher, but is not limited to the above-mentioned equipment. Of course, other more suitable steam cooking devices can also be selected. In the present embodiment, the household appliance is described by taking a steamer as an example, and the rest will not be repeated. The steamer includes a shell, a flap and a flap motor, wherein an inner cavity with one end in an open state is defined on the shell, and a flap is movably provided on the shell, and the output end of the flap motor is connected to the flap to drive the flap to flip, thereby completing the opening and closing of the open end of the inner cavity. In addition, the steamer anti-pinch control circuit includes a driver IC, a forward transistor and a reverse transistor, wherein when the driver IC module outputs a forward voltage, the current flows through the FO pin of the driver IC, the forward transistor, the flap motor, and the BO pin of the driver IC in sequence to drive the flap motor to run forward; when the driver IC module outputs a reverse voltage, the current flows through the BO pin of the driver IC, the flap motor, the reverse The transistor and the FO pin of the driver IC are used to drive the flip motor to run in the reverse direction. In addition, when the driver IC receives a forward driving signal, the output terminal F0 is positive and the BO terminal is negative, and the forward DC12V is output. At this time, there is no signal input to the PWM control terminal of the reverse transistor, and a signal is input to the PWM control terminal of the forward transistor. The forward transistor will be turned on according to the PWM signal, and the current will pass through the FO pin of the driver IC, the forward transistor, the flip motor, and the BO pin of the driver IC to drive the flip motor to run in the forward direction; when the driver IC receives a reverse driving signal, the output terminal F0 is negative and the BO terminal is positive, and the reverse DC12V is output. At this time, there is no signal input to the PWM control terminal of the forward transistor, and a signal is input to the PWM control terminal of the reverse transistor. The reverse transistor will be turned on according to the PWM signal, and the current will pass through the BO pin of the driver IC, the flip motor, the reverse transistor, and the FO pin of the driver IC to drive the flip motor to run in the reverse direction.

[0033] The finger pinch prevention control method in this embodiment specifically includes the following steps:

[0034] Step S101, in the startup phase, when the flap receives a closing signal, the MCU control module drives the flap to move forward to close the flap.

[0035] In this embodiment, when the flap receives a closing signal, the MCU control module controls the forward output voltage of the driver IC module, and at the same time the MCU control module outputs a PWM signal with a duty cycle of 100%. At this time, a larger voltage is provided to the flap motor to increase the starting torque, thereby ensuring that the flap motor starts normally. The flap motor drives the flap to move to the closed position to drive the flap to close. In addition, the flap motor uses a DC 12V voltage, and the flap motor is preferably set to a DC reduction motor.

[0036] Step S102, in the deceleration stage, the MCU control module adjusts the running speed of the motor to reduce the running speed of the flap motor.

[0037] In this embodiment, the MCU control module reduces the duty cycle of the PWM signal and gradually reduces the output voltage of the driver IC module to gradually reduce the operating speed of the flap motor;

[0038] The MCU control module controls the reverse output voltage of the driver IC module. At the same time, the MCU control module outputs a PWM signal and gradually increases the duty cycle from zero;

[0039] The reverse driving force interacts with the inertia force to stop the flap motor from working, thereby stopping the flap from closing.

[0040] Step S103, braking stage, the MCU control module drives the flap to move in the reverse direction until the flap stops closing.

[0041] In this embodiment, after the flap starts to move forward, the PWM duty cycle is adjusted to gradually reduce the input voltage of the flap motor, thereby reducing the operating speed of the flap motor and further reducing the inertial force of the flap movement. By continuing to reduce the driving voltage of the flap motor until it is 0, the flap continues to flip towards the closed position at a low speed due to the inertial motion of the flap. At this time, the MCU control module controls the positive and negative poles of the voltage of the driver IC to start in reverse, so that the flap motor enters a reverse motion trend. The MCU control module outputs a PWM signal and gradually increases the duty cycle from zero. At this time, the flap motor continues to gradually decelerate due to the combined effect of the inertial force and the reverse running voltage, until the reverse voltage drives the flap motor and the inertial sliding force is completely offset, so that the flap is completely stationary to stop the closing movement of the flap. In addition, by gradually increasing the voltage, the purpose is to avoid the back electromotive force generated when the flap is running forward, which is superimposed on the reverse large voltage to cause damage to the device.

[0042] Step S104, the alarm stage, issues an alarm to remind the user.

[0043] In this embodiment, the MCU control module controls the buzzer to output a signal to sound an alarm, thereby reminding the user to prevent fingers from being pinched.

[0044] Step S105, closing stage, after a preset time interval, the MCU control module drives the flap to move forward to complete the closing movement of the flap.

[0045] In this embodiment, after a preset time interval or after the alarm reminder is completed, the MCU control module controls the driver IC module to output the positive voltage to drive the flap to complete the closing movement, and the MCU control module controls the positive and negative poles of the driver IC voltage to start in the reverse direction, so that the flap motor enters a forward movement trend, and the flap motor drives the flap to continue to run forward until the flap abuts against the closed position to complete the closing movement, and then controls the steamer to shut down and end the current work.

[0046] In this embodiment, the preset duration of the starting phase is 1S to 3S, the preset duration of the deceleration phase is 2S to 4S, the preset duration of the braking phase is 1S, the preset duration of the alarm phase is 2S to 3S, and the preset duration of the closing phase is 1S. By pre-setting the running time of each stage, the flap is decelerated when it is in a possible hand-pinching position, that is, the starting phase time of the flap motor is preferably set to 1 second, the deceleration phase time is preferably set to 3 seconds, the braking phase time is preferably set to 1 second, the alarm phase time is preferably set to 3 seconds, and the closing phase time is preferably set to 1 second, so that the circuit turns to the reverse transistor to generate a reverse current to weaken the rebound force of the flap resetting, thereby achieving the purpose of preventing hand pinching.

[0047] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for preventing finger pinching of household appliances, characterized in that: The anti-pinch finger control method comprises the following steps: In the startup phase, when the flap receives a closing signal, the MCU control module drives the flap to move forward to close the flap, and the steps include the MCU control module controlling the driver IC module to output a forward voltage, and the MCU control module outputs a PWM signal with a duty cycle of 100% to drive the flap to move forward; In the deceleration stage, the MCU control module adjusts the running speed of the motor to reduce the running speed of the flap motor, and the steps include the MCU control module reducing the duty cycle of the PWM signal and gradually reducing the output voltage of the driver IC module to gradually reduce the running speed of the flap motor; In the braking stage, the MCU control module drives the flap to move in the reverse direction until the flap stops closing, and the steps include the MCU control module controlling the driver IC module to output voltage in the reverse direction, and the MCU control module controlling the positive and negative poles of the driver IC to start in the reverse direction, and the MCU control module outputs a PWM signal and gradually increases the duty cycle from zero to drive the flap motor to enter a reverse movement trend; Through the interaction between the reverse driving force and the inertial force, until the reverse voltage drives the flap motor and the inertial sliding force is completely offset, the flap is controlled to stop at a position where the hand is easily pinched, so that the flap stops the closing movement; In the alarm phase, an alarm is issued to remind the user; In the closing stage, after a preset time interval, the MCU control module drives the flap to move forward to complete the closing movement of the flap.

2. A household appliance anti-pinch control method according to claim 1, characterized in that: The step of the MCU control module controlling the flap to complete the closing movement comprises: The MCU control module controls the driving IC module to output a forward voltage to drive the flap to move in a forward direction, thereby completing the closing movement of the flap.

3. The finger pinch prevention control method for household appliances according to claim 1, characterized in that: The preset duration of the startup phase is 1S to 3S, the preset duration of the deceleration phase is 2S to 4S, the preset duration of the braking phase is 1S, the preset duration of the alarm phase is 2S to 3S, and the preset duration of the closing phase is 1S.

4. A finger pinch prevention control method for household appliances according to any one of claims 1 to 3, characterized in that: It also includes a forward transistor and a reverse transistor, wherein when the driver IC module outputs a forward voltage, the current flows through the FO pin of the driver IC, the forward transistor, the flip motor, and the BO pin of the driver IC in sequence to drive the flip motor to run forward; when the driver IC module outputs a reverse voltage, the current flows through the BO pin of the driver IC, the flip motor, the reverse transistor, and the FO pin of the driver IC in sequence to drive the flip motor to run reversely.

5. A finger pinch prevention control method for household appliances according to any one of claims 1 to 3, characterized in that: The step of issuing an alarm to remind the user comprises: The MCU control module controls the buzzer to output a signal to sound an alarm, thereby reminding the user to prevent pinching of the hand.

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