A glass lifting system and method based on touch pressure-sensitive buttons

Abstract

The present invention discloses a glass lifting system and method based on a touch pressure-sensitive key, comprising: a pressure-sensitive sensor, which receives key displacement and outputs a differential capacitance; a conversion circuit, which is electrically connected to the pressure-sensitive sensor, and receives the differential capacitance and converts it into an initial voltage; a central controller, which is electrically connected to the conversion circuit, and receives the initial voltage and outputs an adjustment frequency based on the initial voltage; a pulse modulation circuit, which is electrically connected to the central controller and receives the adjustment frequency, and outputs a modulation voltage based on the adjustment frequency; and a motor, which is electrically connected to the pulse modulation circuit and receives the modulation voltage, and the modulation voltage is used to adjust the motor speed and rotation direction.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle door and window glass, and in particular to a glass lifting system and method based on touch pressure-sensitive buttons. Background Art

[0002] Currently, most car window lift controls use push-button controls, with two types of control logic: one that allows the window to be lifted and lowered with one button when the pressure exceeds the rated range, with a fixed lifting speed; the other that allows the window to be lifted and lowered based on the pressing time within the rated range, with a fixed lifting speed. These two control methods make it difficult to control the window opening range, requiring users to make repeated adjustments to achieve the desired effect, and the adjustment process takes a long time, leaving users with the impression that the window adjustment is slow. Recently, new car models are becoming increasingly intelligent, and the lifting and lowering speeds of some windows can be adjusted in the central control system. However, this method of changing the lifting speed does not address user pain points; the fixed-speed lifting method is the root cause of this problem. Summary of the Invention

[0003] In order to solve at least one aspect of the above problems, the present invention provides a glass lifting system based on touch pressure-sensitive buttons, including: a pressure sensor, which receives the button displacement and outputs a differential capacitance; a conversion circuit, which is electrically connected to the pressure sensor, and the conversion receives the differential capacitance and converts it into an initial voltage; a central controller, which is electrically connected to the conversion circuit, and the central controller receives the initial voltage and outputs an adjustment frequency based on the initial voltage; a pulse modulation circuit, which is electrically connected to the central controller and receives the adjustment frequency, and the pulse modulation circuit outputs a modulation voltage based on the adjustment frequency; a motor, which is electrically connected to the pulse modulation circuit and receives the modulation voltage, and the modulation voltage is used to adjust the motor speed and rotation direction.

[0004] Preferably, the motor includes a motor code disk, the central controller receives the real-time code disk value of the motor code disk, the central controller includes a calibration unit, the calibration unit is used to store the adjustment frequency and the motor speed corresponding to the initial voltage, the central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the real-time speed and the target speed corresponding to the adjustment frequency, and the pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

[0005] Preferably, the pressure sensor includes a dynamic electrode plate, a first static electrode plate and a second static electrode plate, the first static electrode plate and the second static electrode plate are arranged in the same plane, the dynamic electrode plate rotates around a fixed axis based on the key displacement, the fixed axis is perpendicular to the plane where the first static electrode plate and the second static electrode plate are located, the dynamic electrode plate and the first static electrode plate output a first capacitor, the dynamic electrode plate and the second static electrode plate output a second capacitor, and the pressure sensor outputs a differential capacitor based on the rotation of the dynamic electrode plate.

[0006] Preferably, the conversion circuit includes a voltage comparator N1, a voltage comparator N2, a bistable trigger, a low-pass filter, a capacitor C11, a capacitor C12, a diode VD11, a diode VD12, a resistor R11, and a resistor R12. The high-level input terminals of the voltage comparator N1 and the voltage comparator N2 are connected to a reference voltage, the low-level input terminal of the voltage comparator N1 is connected to the capacitor C11, the low-level input terminal of the voltage comparator N2 is connected to the capacitor C12, the voltage comparator N1 and the voltage comparator N2 are respectively connected to the input terminals of the bistable trigger, and the output terminals of the bistable trigger are connected to The input end of the low-pass filter, one end of the resistor R11 and the positive electrode of the diode VD11 are connected between the low-level input end of the voltage comparator N1 and the capacitor C11, one end of the resistor R11 and the negative electrode of the diode VD11 are connected between the output end of the bistable trigger and the low-pass filter, the other end of the resistor R12 and the positive electrode of the diode VD12 are connected between the low-level input end of the voltage comparator N2 and the capacitor C12, and the other end of the resistor R12 and the negative electrode of the diode VD12 are connected between the output end of the bistable trigger and the low-pass filter.

[0007] Preferably, the pulse modulation circuit includes a sawtooth wave circuit module, a speed regulation front-end module and a control circuit module, the input end of the sawtooth wave circuit is connected to the power supply, the input end of the speed regulation front-end module is connected to the output end of the sawtooth wave circuit module and the output end of the central controller, the input end of the control circuit module is connected to the output end of the speed regulation front-end module, and the output end of the control circuit module is connected to the motor.

[0008] Preferably, the sawtooth wave circuit module includes: a time base chip, a resistor R3, a resistor R2, a resistor R1, a resistor R4, a resistor R5, a transistor V5, a capacitor C1, a capacitor C2 and a capacitor C3, wherein pin 1 of the time base chip is grounded, pin 7 of the time base chip is grounded through the capacitor C1, pins 4 and 8 of the time base chip are connected to the positive electrode of the power supply, pin 3 of the time base chip is connected to the base of the transistor V5 through the resistor R4, the collector of the transistor V5 is connected to the positive electrode of the power supply, and the emitter of the transistor V5 is connected to the positive electrode of the power supply. The timing chip is grounded through the resistor R5, the pin 6 of the timing chip is connected to the positive electrode of the power supply through the resistor R3, the resistor R2 and the resistor R1 connected in series, one end of the capacitor C2 is grounded, and the other end of the capacitor C2 is connected between the resistor R3 and the pin 6 of the timing chip, the pin 2 of the timing chip is connected between the resistor R3 and the capacitor C2, one end of the capacitor C3 is connected between the resistor R2 and the resistor R1, and the other end of the capacitor C3 is connected to the input end of the speed regulation front module.

[0009] Preferably, the speed regulation front-end module includes an amplifier, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a variable resistor R10, the inverting input end of the amplifier is connected to the output end of the sawtooth wave circuit module through the resistor R7, the inverting input end of the amplifier is connected to the output end of the central controller through the resistor R6, the inverting input end of the amplifier is connected to the negative bias voltage through the variable resistor R10, the non-inverting input end of the amplifier is grounded through the resistor R8, the non-inverting input end of the amplifier is connected to the output end of the amplifier through the resistor R9, and the output end of the amplifier is connected to the input end of the control circuit module.

[0010] Preferably, the control circuit module includes an inverter, a transistor V1, a transistor V2, a transistor V3, a transistor V4, a diode VD1, a diode VD2, a diode VD3 and a diode VD4, the input end of the inverter is connected to the output end of the speed regulation front module, the output end of the inverter is connected to the base of the transistor V3, the collector of the transistor V3 is connected to the input end of the motor, the emitter of the transistor V3 is connected to the anode of the diode VD3, the cathode of the diode VD3 is connected to the anode of the diode VD1, the cathode of the diode VD1 is connected to the collector of the transistor V1, and the transistor V1 The base of the transistor is connected to the output end of the speed regulation front-end module, the emitter of the transistor V1 is connected to the input end of the motor, the output end of the inverter is connected to the base of the transistor V4, the collector of the transistor V4 is connected to the input end of the motor, the emitter of the transistor V4 is connected to the anode of the diode VD4, the cathode of the diode VD4 is connected to the anode of the diode VD2, the cathode of the diode VD2 is connected to the collector of the transistor V2, the base of the transistor V2 is connected to the output end of the speed regulation front-end module, the emitter of the transistor V2 is connected to the input end of the motor, and the emitters of the transistors V3 and V4 are grounded.

[0011] On the other hand, a method for lifting and lowering glass based on touch pressure-sensitive buttons is provided, wherein the pressure-sensitive sensor outputs a differential capacitance based on the received button displacement; the conversion circuit converts the received differential capacitance into an initial voltage signal; the central controller receives the initial voltage signal, and the central controller includes a correspondence between the initial voltage and the target speed, and the central controller outputs an adjustment frequency corresponding to the target speed based on the initial voltage signal; the pulse modulation circuit receives the adjustment frequency and outputs a modulation voltage in response to the adjustment frequency; the motor receives the modulation voltage, and the modulation voltage is used to control the motor speed and rotation direction.

[0012] Preferably, it also includes: the motor includes a motor code disk, the central controller receives a real-time code disk value output by the motor code disk, the central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the real-time speed and the target speed corresponding to the adjustment frequency, and the pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

[0013] The embodiment of the present invention has the following beneficial effects based on the touch pressure-sensitive button glass lifting system: a pressure sensor is integrated on the basis of the upgraded button, which can sense the button displacement, output a control signal through the pressure-sensitive conversion circuit, and is used to adjust the subsequent PWM control circuit. The lifting speed is adjusted by adjusting the PWM duty cycle, thereby realizing stepless adjustment of the window lifting speed by the button displacement, thereby achieving a good window adjustment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] To better understand the above and other objects, features, advantages, and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. Like reference numerals in the accompanying drawings refer to like components. Those skilled in the art should understand that the accompanying drawings are intended to schematically illustrate preferred embodiments of the present invention and have no limiting effect on the scope of the present invention. The components in the drawings are not drawn to scale.

[0015] Figure 1 This is a structural block diagram of a glass lifting system based on touch and pressure sensitive buttons according to an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a pressure-sensitive sensor based on a touch-pressure-sensitive button glass lifting system according to an embodiment of the present invention;

[0017] Figure 3 Schematic diagram of a conversion circuit of a glass lifting system based on touch and pressure sensitive buttons according to an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of a pulse modulation circuit of a glass lifting system based on a touch and pressure-sensitive button according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0020] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or the same objects. Other explicit and implicit definitions may also be included below.

[0021] In order to at least partially solve one or more of the above-mentioned problems and other potential problems, an embodiment of the present disclosure proposes a glass lifting system based on touch pressure-sensitive buttons, including: a pressure-sensitive sensor, a conversion circuit, a central controller, a pulse modulation circuit and a motor, and receives an adjustment frequency, the pressure-sensitive sensor receives the button displacement and outputs a differential capacitance; the conversion circuit is electrically connected to the pressure-sensitive sensor, converts the received differential capacitance and converts it into an initial voltage; the central controller is electrically connected to the conversion circuit, the central controller receives the initial voltage and outputs an adjustment frequency based on the initial voltage; the pulse modulation circuit is electrically connected to the central controller, the pulse modulation circuit outputs a modulation voltage based on the adjustment frequency; the motor is electrically connected to the pulse modulation circuit, and receives the modulation voltage, and the modulation voltage is used to adjust the motor speed and rotation direction.

[0022] Specifically, if Figure 1 As shown, a pressure sensor is positioned below a touch-sensitive pressure button on a vehicle window. When a user applies a key displacement by touching the pressure-sensitive button, the pressure sensor outputs a differential capacitance, i.e., the differential capacitance generated by the user's full key displacement. A conversion circuit, connected to the pressure sensor, converts the differential capacitance into a voltage signal. The conversion circuit then outputs an initial voltage after converting the received differential capacitance. A central controller, such as an onboard controller or a window controller, receives the initial voltage via the conversion circuit. The central controller includes a preset correspondence between the initial voltage and motor speed, for example, the initial voltage is proportional to the motor speed. Upon receiving the initial voltage signal, the central controller determines the corresponding motor speed based on the preset correspondence and outputs a modulation frequency based on the determined motor speed. The pulse modulation circuit utilizes a PWM circuit, which receives the modulation frequency from the central controller to adjust the modulation voltage it outputs. The motor, which drives the window glass, is connected to the window glass drive mechanism. The motor changes its rotation direction and speed based on the modulation voltage received by the pulse modulation circuit, thereby further adjusting the window raising or lowering speed.

[0023] In some embodiments, the motor includes a motor code disk, and the central controller receives the real-time code disk value of the motor code disk. The central controller includes a calibration unit, and the calibration unit is used to store the motor speed and adjustment frequency corresponding to the initial voltage. The central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the target speed corresponding to the real-time speed and the adjustment frequency. The pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

[0024] Specifically, the motor encoder outputs the motor's real-time encoder value via a communication connection with the central controller, allowing the central controller to calculate the motor speed based on the real-time encoder value. A calibration unit stores the correspondence between the initial voltage, the adjustment frequency, and the motor speed. Upon receiving the initial voltage, the central controller determines the target speed corresponding to the initial voltage based on the correspondence between the initial voltage and the motor speed, and then outputs the adjustment frequency based on the determined target speed. Once the central controller determines the motor's real-time speed based on the real-time encoder value, it uses the calibration unit to determine the difference between the adjustment frequency corresponding to the actual speed and the adjustment frequency corresponding to the target speed. The central controller then adjusts the modulation voltage output by the pulse modulation circuit using the output deviation frequency, thereby achieving real-time adjustment of the motor speed and improving the control accuracy of the window glass lifting and lowering speed.

[0025] In some embodiments, as Figure 2 As shown, the pressure sensor uses a plate-type pressure sensor, including a dynamic electrode plate B, a first static electrode plate A, and a second static electrode plate C. The first static electrode plate A and the second static electrode plate C are arranged in the same plane, and the dynamic electrode plate B is parallel to the plane where the first static electrode plate A and the second static electrode plate C are located. The dynamic electrode plate B rotates around a fixed axis in its plane based on the displacement of the key. The fixed axis is perpendicular to the plane where the first static electrode plate A and the second static electrode plate C are located. The dynamic electrode plate B and the first static electrode plate A output a first capacitance value, and the dynamic electrode plate B and the second static electrode plate C output a second capacitance value. The pressure sensor outputs a differential capacitance based on the rotation of the dynamic electrode plate B. When the dynamic electrode plate B is in the initial position, the first capacitor C1 and the second capacitor C2 have the following relationship:

[0026]

[0027] Where S is the relative area between the moving plate B and the first and second static plates A and C, d is the distance between the moving plate and the first and second static plates A and C, R is the radius of the circle containing the outer arc of the first and second static plates A and C, r is the straight radius of the circle containing the inner arc of the first and second static plates A and C, and α0 is the central angle corresponding to the relative portions of the moving plate B and the first and second static plates A and C when the moving plate B is in its initial position. When the moving plate B rotates counterclockwise by a certain angle Δα, the first capacitance C1 and the second capacitance C2 are:

[0028]

[0029]

[0030] In another embodiment, the pressure sensor adopts a cylindrical pressure sensor, so that the angular displacement of the moving plate relative to the initial position can be achieved through the displacement of the key, so that the pressure sensor outputs a differential capacitance. Compared with a single capacitive sensor, the differential output is more linear, with high precision, good stability, and anti-interference characteristics. At the same time, considering that the displacement change when the key is pressed is not a straight line, but a rotation around the axis, the pressure sensor in this application adopts an area-changing differential capacitance sensor. Its basic principle is that when the user presses the key, the moving plate of the electric sensor will be driven to produce an angular displacement, resulting in a change in the area between the two electrode plates of the capacitor, causing the capacitance to change. The user's key displacement degree can be reflected by measuring the change in capacitance.

[0031] In some embodiments, the conversion circuit includes a voltage comparator N1, a voltage comparator N2, a bistable trigger, a low-pass filter, a capacitor C11, a capacitor C12, a diode VD11, a diode VD12, a resistor R11, and a resistor R12. The high-level input terminals of the voltage comparator N1 and the voltage comparator N2 are connected to a reference voltage, the low-level input terminal of the voltage comparator N1 is connected to the capacitor C11, the low-level input terminal of the voltage comparator N2 is connected to the capacitor C12, the voltage comparator N1 and the voltage comparator N2 are respectively connected to the input terminals of the bistable trigger, and the bistable trigger The output end of the flip-flop is connected to the input end of the low-pass filter, one end of the resistor R11 and the positive electrode of the diode VD11 are connected between the low-level input end of the voltage comparator N1 and the capacitor C11, one end of the resistor R11 and the negative electrode of the diode VD11 are connected between the output end of the bistable trigger and the low-pass filter, the other end of the resistor R12 and the positive electrode of the diode VD12 are connected between the low-level input end of the voltage comparator N2 and the capacitor C12, and the other end of the resistor R12 and the negative electrode of the diode VD12 are connected between the output end of the bistable trigger and the low-pass filter.

[0032] Specifically, if Figure 3As shown, the conversion circuit is used to convert the differential capacitance output by the pressure sensor into capacitance-to-voltage. Capacitor C11 and capacitor C12 correspond to the first and second capacitors of the voltage sensor, respectively. When the circuit is working, a stable positive reference voltage Ur is input. At this time, point A at the output of the bistable trigger is high, and point B at the output of the bistable trigger is low. Capacitor C11 is charged through the loop formed by resistor R11 and capacitor C11. When charged to Ur, the voltage comparator N1 flips, point A at the output of the bistable trigger is low, and point B at the output of the bistable trigger is high. Diode VD11 turns on, capacitor C11 discharges, and capacitor C12 charges. When the voltage of capacitor C12 is charged to the same as the reference voltage Ur, the voltage comparator N2 flips. This cycle repeats, and the output is high and low, modulated by capacitors C11 and C12. The output voltage is the difference between the two output ports A and B. The presence of differential capacitors C11 and C12 can eliminate the common-mode deviation in the circuit and achieve more accurate voltage conversion.

[0033] By charging and discharging the pressure sensor's capacitor, the circuit's output pulse width changes with the sensor's capacitance. This pulse is then converted to a DC signal through a low-pass filter and input into the central controller. Compared to other conversion circuits, this circuit exhibits theoretically more linear characteristics, ensuring output accuracy. Furthermore, its use of a DC power supply offers improved voltage stability, eliminating the need for voltage and frequency stabilization, resulting in lower cost and higher accuracy.

[0034] In some embodiments, the pulse modulation circuit includes a sawtooth wave circuit module, a speed regulation front-end module and a control circuit module. The input end of the sawtooth wave circuit is connected to the power supply, the input end of the speed regulation front-end module is connected to the output end of the sawtooth wave circuit module and the output end of the central controller, the input end of the control circuit module is connected to the output end of the speed regulation front-end module, and the output end of the control circuit module is connected to the motor.

[0035] Specifically, the sawtooth wave circuit module is used to generate a sawtooth wave voltage; the input end of the speed regulation front module receives the sawtooth wave voltage, and at the same time receives the adjustment frequency output by the central control based on the input initial voltage, and receives the input of the negative bias voltage, wherein the negative bias voltage is used to ensure that the output average signal is also 0 when the input is 0; the control circuit module outputs a modulation voltage with a specific duty cycle to control the input power of the motor, thereby changing the speed of the lifting motor, and then the lifting motor controls the lifting speed of the window glass.

[0036] In some embodiments, the sawtooth wave circuit module includes: a time base chip, a resistor R3, a resistor R2, a resistor R1, a resistor R4, a resistor R5, a transistor V5, a capacitor C1, a capacitor C2, and a capacitor C3. The time base chip uses a time base 555 chip. Pin 1 of the time base chip is grounded, pin 7 of the time base chip is connected to the first end of capacitor C1, the second end of capacitor C1 is grounded, pin 4 of the time base chip is connected to the positive electrode of power supply E, pin 8 of the time base chip is connected to the positive electrode of power supply E, pin 3 of the time base chip is connected to the first end of resistor R4, the second end of resistor R4 is connected to the base of transistor V5, the collector of transistor V5 is connected to the positive electrode of power supply E, and the emitter of transistor V5 is connected to resistor R5. The first end of the resistor R3 is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the positive electrode of the power supply E, the first end of the capacitor C2 is grounded, the second end of the capacitor C2 is connected to the first end of the resistor R3 and the pin 6 of the time base chip, the pin 2 of the time base chip is connected to the first end of the resistor R3 and the second end of the capacitor C2, the first end of the capacitor C3 is connected to the second end of the resistor R2 and the first end of the resistor R1, the second end of the capacitor C3 outputs the sawtooth wave signal Uf, and is connected to the input end of the speed regulation front-end module, that is, the first end of the resistor R7.

[0037] In some embodiments, the speed regulation front-end module includes an amplifier, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a variable resistor R10. The first end of the resistor R7 is connected to the second end of the capacitor C3, the first end of the resistor R7 is connected to the inverting input end of the amplifier, the first end of the resistor R6 is connected to the central controller to receive the control signal Uc output by the central controller, the second end of the resistor R6 is connected to the inverting input end of the amplifier, the first end of the variable resistor R10 is connected to the negative bias voltage, the second end of the variable resistor R10 is connected to the inverting input end of the amplifier, the first end of the resistor R8 is grounded, the second end of the resistor R8 is connected to the non-inverting input end of the amplifier, the first end of the resistor R9 is connected to the non-inverting input end of the amplifier, the second end of the resistor R9 is connected to the output end of the amplifier, and the output end of the amplifier is connected to the input end of the control circuit module.

[0038] In some embodiments, the control circuit module includes an inverter, a transistor V1, a transistor V2, a transistor V3, a transistor V4, a diode VD1, a diode VD2, a diode VD3 and a diode VD4, the input end of the inverter is connected to the output end of the speed control front module, the output end of the inverter is connected to the base of the transistor V3, the collector of the transistor V3 is connected to the input end of the motor, the emitter of the transistor V3 is connected to the positive electrode of the diode VD3, the negative electrode of the diode VD3 is connected to the positive electrode of the diode VD1, the negative electrode of the diode VD1 is connected to the collector of the transistor V1, and the transistors The base of transistor V1 is connected to the output end of the speed regulation front-end module, the emitter of transistor V1 is connected to the input end of the motor, the output end of the inverter is connected to the base of transistor V4, the collector of transistor V4 is connected to the input end of the motor, the emitter of transistor V4 is connected to the positive electrode of diode VD4, the negative electrode of diode VD4 is connected to the positive electrode of diode VD2, the negative electrode of diode VD2 is connected to the collector of transistor V2, the base of transistor V2 is connected to the output end of the speed regulation front-end module, the emitter of transistor V2 is connected to the input end of the motor, and the emitters of transistors V3 and V4 are grounded.

[0039] On the other hand, a method for lifting and lowering glass based on touch pressure-sensitive buttons is provided, wherein the pressure-sensitive sensor outputs a differential capacitance based on the received button displacement; the conversion circuit converts the received differential capacitance into an initial voltage signal; the central controller receives the initial voltage signal, and the central controller includes a correspondence between the initial voltage and the target speed, and the central controller outputs an adjustment frequency corresponding to the target speed based on the initial voltage signal; the pulse modulation circuit receives the adjustment frequency and outputs a modulation voltage in response to the adjustment frequency; the motor receives the modulation voltage, and the modulation voltage is used to control the motor speed and rotation direction.

[0040] Specifically, the glass lifting method based on touch pressure-sensitive buttons adopts any of the glass lifting systems based on touch pressure-sensitive buttons as described above. When the user wants to raise or lower the glass, the user presses the glass lifting button with his hand. The amplitude of the button displacement change corresponds to the change in the capacitance of the pressure sensor, and the differential capacitance is output through the pressure sensor. The conversion circuit is a capacitor-voltage conversion circuit, which is used to convert the differential capacitance into an initial voltage and input it into the central controller. The central controller analyzes the motor speed corresponding to this initial voltage (or the pressure value corresponding to the motor speed) based on the existing program, and outputs the adjustment frequency corresponding to the motor speed to the PWM pulse modulator. The PWM pulse modulator generates a modulation voltage with a specific duty cycle to control the input power of the motor, thereby changing the speed of the lifting motor.

[0041] In some embodiments, it also includes: the motor includes a motor code disk, the central controller receives a real-time code disk value output by the motor code disk, the central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the real-time speed and the target speed corresponding to the adjustment frequency, and the pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

[0042] Specifically, the encoder on the lifting motor feeds back the motor's real-time encoder value to the central controller. The central controller calculates the corresponding real-time speed and compares it with the target speed to generate a deviation frequency, which is input into the PWM pulse modulator to correct the duty cycle, thereby achieving precise and rapid control of the speed.

[0043] While various embodiments of the present disclosure have been described above, the foregoing description is intended to be illustrative, non-exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable others skilled in the art to understand this document.

Claims

1. A glass lifting system based on touch pressure-sensitive buttons, characterized in that: include: A pressure sensor that receives key displacement and outputs a differential capacitor; a conversion circuit, the conversion circuit being electrically connected to the pressure sensor, the conversion circuit receiving the differential capacitance and converting it into an initial voltage; a central controller, the central controller being electrically connected to the conversion circuit, the central controller receiving the initial voltage and outputting an adjusted frequency based on the initial voltage; a pulse modulation circuit, the pulse modulation circuit being electrically connected to the central controller and receiving the adjustment frequency, the pulse modulation circuit outputting a modulation voltage based on the adjustment frequency; A motor, the motor is electrically connected to the pulse modulation circuit and receives the modulation voltage, the modulation voltage is used to adjust the motor speed and rotation direction, the motor includes a motor code disk, the central controller receives the real-time code disk value of the motor code disk, the central controller includes a calibration unit, the calibration unit is used to store the adjustment frequency and the motor speed corresponding to the initial voltage, the central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the real-time speed and the target speed corresponding to the adjustment frequency, and the pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

2. The system according to claim 1, wherein: The pressure sensor includes a dynamic electrode plate, a first static electrode plate and a second static electrode plate. The first static electrode plate and the second static electrode plate are arranged in the same plane. The dynamic electrode plate rotates around a fixed axis based on the key displacement. The fixed axis is perpendicular to the plane where the first static electrode plate and the second static electrode plate are located. The dynamic electrode plate and the first static electrode plate output a first capacitor, and the dynamic electrode plate and the second static electrode plate output a second capacitor. The pressure sensor outputs a differential capacitor based on the rotation of the dynamic electrode plate.

3. The system according to claim 2, characterized in that The conversion circuit includes a voltage comparator N1, a voltage comparator N2, a bistable trigger, a low-pass filter, a capacitor C11, a capacitor C12, a diode VD11, a diode VD12, a resistor R11, and a resistor R12. The high-level input terminals of the voltage comparator N1 and the voltage comparator N2 are connected to a reference voltage, the low-level input terminal of the voltage comparator N1 is connected to the capacitor C11, the low-level input terminal of the voltage comparator N2 is connected to the capacitor C12, the voltage comparator N1 and the voltage comparator N2 are respectively connected to the input terminals of the bistable trigger, and the output terminals of the bistable trigger are connected to the low-pass The input end of the filter, one end of the resistor R11 and the positive electrode of the diode VD11 are connected between the low-level input end of the voltage comparator N1 and the capacitor C11, one end of the resistor R11 and the negative electrode of the diode VD11 are connected between the output end of the bistable trigger and the low-pass filter, the other end of the resistor R12 and the positive electrode of the diode VD12 are connected between the low-level input end of the voltage comparator N2 and the capacitor C12, and the other end of the resistor R12 and the negative electrode of the diode VD12 are connected between the output end of the bistable trigger and the low-pass filter.

4. The system according to claim 1, wherein: The pulse modulation circuit includes a sawtooth wave circuit module, a speed regulation front-end module and a control circuit module. The input end of the sawtooth wave circuit is connected to the power supply, the input end of the speed regulation front-end module is connected to the output end of the sawtooth wave circuit module and the output end of the central controller, the input end of the control circuit module is connected to the output end of the speed regulation front-end module, and the output end of the control circuit module is connected to the motor.

5. The system according to claim 4, characterized in that The sawtooth wave circuit module includes: a time base chip, a resistor R3, a resistor R2, a resistor R1, a resistor R4, a resistor R5, a transistor V5, a capacitor C1, a capacitor C2 and a capacitor C3, wherein pin 1 of the time base chip is grounded, pin 7 of the time base chip is grounded through the capacitor C1, pins 4 and 8 of the time base chip are connected to the positive electrode of the power supply, pin 3 of the time base chip is connected to the base of the transistor V5 through the resistor R4, the collector of the transistor V5 is connected to the positive electrode of the power supply, and the emitter of the transistor V5 is connected to the positive electrode of the power supply. The timing chip is grounded through the resistor R5, the pin 6 of the timing chip is connected to the positive electrode of the power supply through the resistor R3, the resistor R2 and the resistor R1 connected in series, one end of the capacitor C2 is grounded, and the other end of the capacitor C2 is connected between the resistor R3 and the pin 6 of the timing chip, the pin 2 of the timing chip is connected between the resistor R3 and the capacitor C2, one end of the capacitor C3 is connected between the resistor R2 and the resistor R1, and the other end of the capacitor C3 is connected to the input end of the speed regulation front module.

6. The system according to claim 5, characterized in that The speed regulation front-end module includes an amplifier, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a variable resistor R10. The inverting input of the amplifier is connected to the output of the sawtooth wave circuit module through the resistor R7, the inverting input of the amplifier is connected to the output of the central controller through the resistor R6, the inverting input of the amplifier is connected to the negative bias voltage through the variable resistor R10, the non-inverting input of the amplifier is grounded through the resistor R8, the non-inverting input of the amplifier is connected to the output of the amplifier through the resistor R9, and the output of the amplifier is connected to the input of the control circuit module.

7. The system according to claim 6, characterized in that The control circuit module includes an inverter, a transistor V1, a transistor V2, a transistor V3, a transistor V4, a diode VD1, a diode VD2, a diode VD3 and a diode VD4. The input end of the inverter is connected to the output end of the speed regulation front module, the output end of the inverter is connected to the base of the transistor V3, the collector of the transistor V3 is connected to the input end of the motor, the emitter of the transistor V3 is connected to the anode of the diode VD3, the cathode of the diode VD3 is connected to the anode of the diode VD1, the cathode of the diode VD1 is connected to the collector of the transistor V1, and the base of the transistor V1 is connected to the cathode of the diode VD1. The output end of the speed regulation front module is connected to the base of the transistor V4, the collector of the transistor V4 is connected to the input end of the motor, the emitter of the transistor V4 is connected to the anode of the diode VD4, the cathode of the diode VD4 is connected to the anode of the diode VD2, the cathode of the diode VD2 is connected to the collector of the transistor V2, the base of the transistor V2 is connected to the output end of the speed regulation front module, the emitter of the transistor V2 is connected to the input end of the motor, and the emitters of the transistors V3 and V4 are grounded.

8. A glass lifting method based on touch pressure-sensitive buttons, characterized in that: The pressure sensor outputs a differential capacitance based on the received key displacement; The conversion circuit converts the received differential capacitance into an initial voltage signal; The central controller receives the initial voltage signal, the central controller includes a correspondence between the initial voltage and the target speed, and the central controller outputs an adjustment frequency corresponding to the target speed based on the initial voltage signal; The pulse modulation circuit receives the adjustment frequency and outputs a modulation voltage in response to the adjustment frequency; The motor receives the modulation voltage, which is used to control the motor speed and rotation direction. The motor includes a motor code disk. The central controller receives a real-time code disk value output by the motor code disk. The central controller calculates the real-time speed of the motor based on the real-time code disk value, and outputs a deviation frequency based on the real-time speed and the target speed corresponding to the adjustment frequency. The pulse modulation circuit adjusts the modulation voltage based on the received deviation frequency.

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