WO2021249100A1

WO2021249100A1 - Multi-functional mutual-induction vehicle power window anti-pinch controller and control method

Info

Publication number: WO2021249100A1
Application number: PCT/CN2021/093502
Authority: WO
Inventors: 张李桂; 吴初莹
Original assignee: 福建省霞浦县景禾机电有限公司; 张李桂
Priority date: 2020-06-09
Filing date: 2021-05-13
Publication date: 2021-12-16
Also published as: CN111520018A

Abstract

Disclosed are a multi-functional mutual-induction vehicle power window anti-pinch controller and control method. The multi-functional mutual-induction vehicle power window anti-pinch controller comprises a control circuit and an armature BEM signal transducer T1, wherein the control circuit comprises a main control chip U1, and the armature BEM signal transducer T1 comprises a primary winding and a secondary winding; one end of the primary winding and one end of the secondary winding are simultaneously grounded, the other end of the primary winding is used for connecting to BEM ripple signals, and the other end of the secondary winding is electrically connected to one end of the main control chip U1. In the present invention, BEM ripple signals of a vehicle window electric motor M when rotating are sampled by means of the armature BEM signal transducer T1, and pulse width change of electric motor BEM signals is monitored by the main control chip U1, such that whether an object is pinched by the vehicle power window during rising is accurately determined, and when there is an obstacle, the vehicle window electric motor M is controlled in a timely manner to prevent an object or a human body from being pinched, thereby realizing an anti-pinch function of the vehicle window.

Description

Multifunctional mutual inductance type electric vehicle window anti-pinch controller and control method

Technical field

The invention relates to the technical field of motor control, in particular to a multifunctional mutual inductance type electric window anti-pinch controller and a control method.

Background technique

With the advancement of modern automobile electronic technology, traditional parts and assemblies in automobiles are also developing towards mechatronics. Among them, a large number of electronic devices are used in automobiles, which is conducive to improving the comfort and convenience of automobiles. However, some electronic devices have certain safety risks during the use process, and as people's requirements for safety become higher and higher, How to ensure the comfort and simplicity of the car and improve the safety performance of electronic equipment in the car has also become a trend in the current car development.

In the prior art, for the convenience of drivers and passengers, a large number of cars use electric windows, but many electric windows do not have all the following functions in one: glass anti-pinch function, one-key window closing function, one-key window opening function And the automatic window closing function when parking and so on. Especially the anti-pinch function, it is more likely to cause injury to passengers, especially children. Therefore, for the sake of safety, it is absolutely necessary to develop a multi-functional window anti-pinch control module.

technical problem

The technical problem to be solved by the present invention is to provide a multifunctional mutual inductance type electric window anti-pinch controller and control method to realize the anti-pinch function of the window.

Technical solutions

In order to solve the above technical problems, the technical solutions adopted by the present invention are:

Multifunctional mutual inductance type power window anti-pinch controller, including a control circuit and an armature BEM signal transformer T1, the control circuit includes a main control chip U1, and the armature BEM signal transformer T1 includes a primary winding and a secondary winding ；

One end of the primary winding and one end of the secondary winding are grounded at the same time, the other end of the primary winding is used to connect the BEM ripple signal, and the other end of the secondary winding is connected to one end of the main control chip U1 Electrical connection

The main control chip U1 is used to generate an anti-pinch control signal that can control the operation of the window motor M according to the pulse width deformation of the BEM ripple signal.

In order to solve the above technical problems, another technical solution adopted by the present invention is:

A mutual inductance type electric window anti-pinch control method includes the steps:

S1. Collect the BEM ripple signal of the window motor M;

S2. Determine whether the pulse width deformation of the BEM ripple signal is greater than a preset threshold, and if so, generate an anti-pinch control signal to control the operation of the window motor M.

Beneficial effect

The beneficial effects of the present invention are: the multifunctional mutual inductance type electric window anti-pinch controller and control method, through the armature BEM signal transformer T1 to sample the BEM ripple signal when the window motor M rotates, and the main control chip U1 Monitor the pulse width change of the motor BEM signal, so as to accurately determine whether the power window is pinching an object during the ascent process, and when encountering an obstacle, timely control the window motor M to prevent the object or human body from being pinched. So as to realize the anti-pinch function of the window.

Description of the drawings

1 is a schematic circuit diagram of a multifunctional mutual inductance type electric window anti-pinch controller according to an embodiment of the present invention;

2 is a schematic diagram of the structure of an armature BEM signal transformer according to an embodiment of the present invention;

3 is a schematic diagram of the structure of the anti-pinch area involved in an embodiment of the present invention;

4 to 6 are corresponding schematic diagrams of the ECU module and the vehicle window involved in the embodiment of the present invention in different implementation manners;

FIG. 7 is a schematic flowchart of a mutual inductance type electric window anti-pinch control method according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a specific flow chart of a mutual inductance type power window anti-pinch control method according to an embodiment of the present invention.

Label description:

T1, armature BEM signal transformer; U1, main control chip; U2, operational amplifier; U3, three-terminal power supply regulator chip; U4, drive chip; U5, Schmitt trigger; D1, diode; M, car window Motor; K1, relay; R1-R17, resistance; C1-C8 and C12-C16, capacitor.

Embodiments of the present invention

In order to describe in detail the technical content, the achieved objectives and effects of the present invention, the following description will be given in conjunction with the embodiments and the accompanying drawings.

1 to 8, a multifunctional mutual inductance type electric window anti-pinch controller, including a control circuit and an armature BEM signal transformer T1, the control circuit includes a main control chip U1, the armature BEM signal The transformer T1 includes a primary winding and a secondary winding;

From the above description, the beneficial effect of the present invention is that the BEM ripple signal of the window motor M is sampled through the armature BEM signal transformer T1 when the window motor M is rotating, and the main control chip U1 monitors the pulse width change of the motor BEM signal, Therefore, it can be accurately judged whether the power window is clamping an object during the ascent process, and when an obstacle is encountered, the window motor M is controlled in time to prevent the object or the human body from being pinched, thereby realizing the window anti-clamping function.

Further, the control circuit further includes an operational amplifier U2, a Schmitt trigger U5 and a driving chip U4;

The other end of the secondary winding is electrically connected to the sixth pin of the operational amplifier U2, and the seventh pin of the operational amplifier U2 is electrically connected to the first pin of the Schmitt trigger U5 after passing through an RC filter circuit. Connected, the twelfth pin of the Schmitt trigger U5 is electrically connected to the second pin of the main control chip U1;

The tenth pin of the main control chip U1 is electrically connected to the first pin of the drive chip U4, and the eleventh pin of the main control chip U1 is electrically connected to the second and third pins of the drive chip U4 , The seventh pin and the eighth pin of the driving chip U4 generate driving signals that can drive the relay K1 to control the operation of the window motor M.

Among them, the BEM ripple signal is collected by the armature BEM signal transformer T1 and amplified by the operational amplifier U2, and then converted into a digital pulse signal after passing through the Schmitt trigger U5. Therefore, the main control chip U1 is the conversion of the BEM ripple signal The pulse width change of the subsequent digital pulse signal is processed.

From the above description, it can be seen that the signal is amplified by the operational amplifier U2, and the analog signal is converted into a digital pulse signal through the Schmitt trigger U5, which is provided to the main control chip U1 to determine whether an obstacle is encountered. When an obstacle is encountered , Output the corresponding switch signal to the drive chip U4, and then drive the relay K1 through the output of the corresponding channel of the drive chip U4 to control the reverse of the window motor M, so that the window is lowered to prevent the object or the human body from being pinched, so as to realize the vehicle Window anti-pinch function.

Further, it further includes a resistor R13, one end of the resistor R13 is electrically connected to one end of the primary winding and the other end is electrically connected to the fourteenth pin of the main control chip U1.

It can be seen from the above description that a resistor R13 is connected to one end of the primary winding to detect the change in the armature current of the motor, and send the change in the armature current of the motor to the main control chip U1 to implement overcurrent protection when the motor is locked.

Further, it also includes a capacitor C12, a resistor R15 and a capacitor C6;

One end of the capacitor C12 is connected to the input voltage signal and the other end is simultaneously electrically connected to the second pin of the operational amplifier U2, one end of the resistor R15, and one end of the capacitor C6. The other end of the resistor R15 is electrically connected to the The other end of the capacitor C6 is simultaneously electrically connected to the first pin of the operational amplifier U2, and the first pin of the operational amplifier U2 is electrically connected to the eighteenth pin of the main control chip U1.

It can be seen from the above description that the ripple signal of the motor operation is collected by the capacitor C12. The signal is amplified by the internal unit of the resistor R15, the capacitor C6 and the operational amplifier U2 and then output to the main control chip U1 through the first pin of the operational amplifier U2. Automatic window closing function when parking.

Further, the primary winding includes a primary magnetic ring and a constantan wire winding 1-2 turns of the primary magnetic ring. The constantan wire has a diameter of 1.5 mm and a resistance value of 5-10 milliohms. The secondary winding includes a secondary magnetic ring and an enameled wire winding 500-1000 turns of the secondary magnetic ring, and the diameter of the enameled wire is 0.1 mm.

It can be seen from the above description that the primary coil and the secondary coil of the armature BEM signal transformer T1 are 1:500, and the BEM ripple signal when the window motor M is rotating is sampled by the transformer T1 and increased to a sufficient voltage amplitude (1:500 ), then connect to the sixth pin of the operational amplifier U2 for amplification.

Further, it also includes a voltage stabilizing circuit, which includes a three-terminal power supply voltage stabilizing chip U3, a diode D1, a capacitor C7, and a capacitor C8;

The anode of the diode D1 is connected to the input voltage signal and the cathode is simultaneously electrically connected to the first pin of the three-terminal power supply regulator chip U3 and one end of the capacitor C7, and the third terminal of the three-terminal power supply regulator chip U3 The pin is electrically connected to the first pin of the main control chip U1, the eighth pin of the operational amplifier U2, the fourteenth pin of the Schmitt trigger U5, and one end of the capacitor C8 at the same time. The second pin of the terminal power supply regulator chip U3, the other end of the capacitor C7 and the other end of the capacitor C8 are grounded.

Further, the input voltage signal is 12V, and the output voltage signal of the third pin of the three-terminal power supply regulator chip U3 is 5V.

It can be seen from the above description that the three-terminal power supply regulator chip U3 regulates the input voltage of 12V into an output voltage of 5V to supply power to the main control chip U1, the operational amplifier U2 and the Schmitt trigger U5 for normal operation.

Please refer to Figure 1 to Figure 8, the mutual inductance type electric window anti-pinch control method, including the steps:

S1. Collect the BEM ripple signal of the window motor M;

Further, the step S2 specifically includes the following steps:

It is determined whether the time after the start of the window motor M has reached the preset delay time, and if it is, it is determined whether the pulse width deformation of the BEM ripple signal is greater than a preset threshold, and if it is, an anti-pinch control signal is generated to control The window motor M runs, and the preset delay time is between 40ms-60ms.

It can be seen from the above description that when the window motor M is just started, since the back electromotive force of the motor has not been established, the current will have a relatively large value for a short time, and the current amplitude at this time is often greater than the set overcurrent protection current threshold. It is even larger, and it is necessary to distinguish this state with a large current amplitude from obstacles encountered during the ascent of the window. Therefore, after starting the window motor M, perform an appropriate delay and then perform the detection of the BEM ripple signal, so as to avoid the influence of the instantaneous overshoot in the initial stage of the motor start on the overcurrent threshold setting and the anti-pinch threshold setting.

Further, the step S2 specifically includes the following steps:

Read the current position of the car window and the key input signal. If the key input signal is a window lift signal, output a switch signal to drive the window motor M to move up and down. If the window lift signal is a window lift signal , The BEM pulse signal is counted up to obtain the real-time position of the car window, if the window lift signal is a window down signal, the BEM pulse signal is counted down to obtain the real-time position of the car window, The BEM pulse signal is a digital pulse signal obtained after the Schmitt trigger U5 converts the BEM ripple signal;

Determine whether the real-time position of the vehicle window is in the anti-pinch area, if so, determine whether the pulse width deformation of the BEM ripple signal is greater than a preset threshold, and if it is, generate an anti-pinch control signal to control the reverse rotation of the window motor M , The anti-pinch area is between the minimum value of the window rise and the maximum value of the window rise, and the range of the minimum value of the window rise is between 30mm and 80mm when the window rises from the bottom end, and the window rises The highest value ranges from 3mm to 5mm from the top of the car window.

It can be seen from the above description that the rotation of the window motor M will drive the movement of the wire rope, thereby controlling the up and down movement of the window. During the movement of the window, the number of rotations of the motor is proportional to the distance of the window. The rotation of the motor rotor will cause the transformer to induce a pulse signal. When the window is raised from the lowest position to the top, the pulse signal output by the armature BEM signal transformer T1 can be counted through the main control chip U1 and recorded in the memory. After that, the software controls the window to start running from the bottom end position, the window runs to the top end, the motor is blocked, and the counting starts from zero. The rising process is performed according to the current count value, and the falling process is performed according to the current count value. Count down. Therefore, the current position of the window can be determined in real time through the pulse output of the armature BEM signal transformer T1 and the counting scheme, and the anti-pinch function of the window can be determined according to the above-determined anti-pinch area.

Please refer to FIG. 1 to FIG. 8, the first embodiment of the present invention is:

A multifunctional mutual inductance type electric window anti-pinch controller, including a control circuit, a voltage stabilizing circuit, and an armature BEM signal transformer T1, wherein the control circuit includes a main control chip U1, an operational amplifier U2, and a Schmitt trigger U5 And the driving chip U4, the armature BEM signal transformer T1 includes a primary winding and a secondary winding; the voltage stabilizing circuit includes a three-terminal power supply voltage stabilizing chip U3, a diode D1, a capacitor C7 and a capacitor C8.

As shown in Figure 1, one end of the primary winding and one end of the secondary winding are grounded at the same time, and the other end of the primary winding is connected to the third and seventh pins of the relay K1 to access the BEM ripple signal. The other end is electrically connected to the sixth pin of the operational amplifier U2, the seventh pin of the operational amplifier U2 is electrically connected to the first pin of the Schmitt trigger U5 after an RC filter circuit, and the twelfth pin of the Schmitt trigger U5 The pin is electrically connected to the second pin of the main control chip U1 through a resistor R8, the tenth pin of the main control chip U1 is electrically connected to the first pin of the drive chip U4, and the eleventh pin of the main control chip U1 is electrically connected to the drive chip U4. The second pin and the third pin are electrically connected, and the seventh pin and the eighth pin of the driving chip U4 are respectively connected to the tenth pin and the fourth pin of the relay K1, thereby driving the relay K1 to control the driving signal of the window motor M operation.

That is, in this embodiment, the armature BEM signal transformer T1 is used to sample the BEM ripple signal of the window motor M when it is rotating, the signal is amplified by the operational amplifier U2, and the analog signal is converted into a digital pulse through the Schmitt trigger U5. Signal, the main control chip U1 monitors the pulse width change of the motor BEM signal to determine whether an obstacle is encountered, so as to accurately determine whether the power window is clamping an object during the ascent process, and output the corresponding output when encountering an obstacle The switch signal is sent to the driver chip U4, and then the relay K1 is driven by the output of the corresponding channel of the driver chip U4 to control the reverse of the window motor M, so that the window is lowered to prevent objects or human beings from being pinched, thereby realizing the window anti-pinch Features.

As shown in Figure 1, the anode of the diode D1 is connected to the 12V input voltage signal and the cathode is simultaneously electrically connected to the first pin of the three-terminal power supply regulator chip U3 and one end of the capacitor C7, and the third terminal of the three-terminal power supply regulator chip U3 The output voltage signal of the pin is 5V, and it is electrically connected to the first pin of the main control chip U1, the eighth pin of the operational amplifier U2, the fourteenth pin of the Schmitt trigger U5 and one end of the capacitor C8 at the same time, a three-terminal power supply The second pin of the voltage stabilizing chip U3, the other end of the capacitor C7 and the other end of the capacitor C8 are grounded to supply power to the main control chip U1, the operational amplifier U2 and the Schmitt trigger U5 for normal operation.

As shown in Figure 1, the RC filter circuit includes a resistor R17 and a capacitor C13, both of which are electrically connected to the seventh pin of the operational amplifier U2. The other end of the resistor R17 is electrically connected to the first pin of the Schmitt trigger U5. The capacitor The other end of C13 is grounded.

In this embodiment, the resistor R13 is further included. One end of the resistor R13 is electrically connected to one end of the primary winding and the other end is electrically connected to the fourteenth pin of the main control chip U1, so as to implement overcurrent protection when the motor is locked.

In this embodiment, it also includes a capacitor C12, a resistor R15, and a capacitor C6. One end of the capacitor C12 is connected to the input voltage signal and the other end is simultaneously electrically connected to the second pin of the operational amplifier U2, one end of the resistor R15, and one end of the capacitor C6. The other end of the resistor R15 and the other end of the capacitor C6 are simultaneously electrically connected to the first pin of the operational amplifier U2, and the first pin of the operational amplifier U2 is electrically connected to the eighteenth pin of the main control chip U1 via the resistor R12 to realize automatic parking Window closing function.

As shown in Figure 2, in this embodiment, the primary winding includes a primary magnetic ring and constantan wire winding 1-2 turns of the primary magnetic ring. The diameter of the constantan wire is 1.5mm and the resistance is 5-10 milliohms. , The secondary winding includes a secondary magnetic ring and an enameled wire winding 500-1000 turns of the secondary magnetic ring, the diameter of the enameled wire is 0.1mm.

As shown in Figure 1, this embodiment also includes a window up button and a down button, which are respectively connected to the 5th and 7th pins of the main control chip through a resistor R4 and a resistor R5, and a resistor R6 is respectively connected in parallel And resistor R7. In addition, the peripheral circuit of each chip is for the better work of the chip, and the electronic components are not described further, such as the resistor R9 and resistor R10 connected to the first pin and the second pin of the driving chip U4. The capacitor C4 connected between the fourth pin and the fifth pin and so on.

In this embodiment, the multifunctional mutual-inductance power window anti-pinch controller is a module. In the entire window control system, a “general distributed, local centralized” control scheme or a separate control scheme is adopted. For example, as shown in Figure 4, the control of four windows is used as an ECU module, or the control of two windows as shown in Figure 5 is used as an ECU module, or a single window is used as an ECU module as shown in Figure 6. .

Among them, on the basis of the first embodiment, the specific process of realizing the anti-pinch function refers to the second embodiment below.

Please refer to FIG. 1 to FIG. 8, the second embodiment of the present invention is:

S1. Collect the BEM ripple signal of the window motor M;

In this embodiment, step S1 is to collect the BEM ripple signal by the armature BEM signal transformer T1, and the following step S2 is processed by the main control chip U1.

In this embodiment, step S2 specifically includes the following steps:

Read the current position of the window and the key input signal. If the key input signal is a window lift signal, the switch signal is output to drive the window motor M to move up and down. If the window lift signal is a window lift signal, the BEM The pulse signal is counted up to get the real-time position of the car window. If the window lift signal is a window down signal, the BEM pulse signal is counted down to get the real-time position of the car window. Among them, the BEM pulse signal is Schmitt trigger The digital pulse signal obtained by the converter U5 after converting the BEM ripple signal;

Judge whether the time after the start of the window motor M reaches the preset delay time, if it is, judge whether the real-time position of the window is in the anti-pinch area through the main control chip U1, if it is, judge whether the pulse width deformation of the BEM ripple signal is greater than the preset Set the threshold, and if yes, generate an anti-pinch control signal to control the reverse of the window motor M, and the anti-pinch area is between the lowest value of the window rise and the highest value of the window rise.

In this embodiment, the preset delay time is between 40ms-60ms. As shown in FIG. 8, the preset delay time is 50ms to avoid the influence of the instantaneous overshoot of the motor at the initial stage of starting the anti-pinch threshold. The minimum value range of the window rise is between 30mm and 80mm from the bottom of the window, and the maximum value range of the window rise is between 3mm and 5mm from the top, as shown in Figure 3. The minimum value range of the window rise is 50mm from the bottom of the window, and the maximum value of the window rise is 4mm from the top, that is, only the middle is the anti-pinch area, and both sides are non-anti-pinch Area.

In summary, the present invention provides a multifunctional mutual inductance type electric window anti-pinch controller and control method, through the armature BEM signal transformer T1 to sample the BEM ripple signal of the window motor M when it is rotating, The three-terminal power supply regulator chip U3 stabilizes the 12V input voltage into 5V output voltage to supply power to the main control chip U1, operational amplifier U2 and Schmitt trigger U5 for normal operation, and signal amplification through operational amplifier U2 , And through Schmitt trigger U5 to convert the analog signal into a digital pulse signal, to provide the main control chip U1 to determine whether it encounters obstacles, when encountering obstacles, output the corresponding switch signal to the drive chip U4, and then The relay K1 is driven by the output of the corresponding channel of the driving chip U4 to control the reversal of the window motor M, so that the window is lowered to prevent the object or the human body from being pinched, thereby realizing the window anti-pinch function. A resistor R13 is connected to one end of the primary winding to detect the change in the armature current of the motor, and send the change in the armature current of the motor to the main control chip U1 to implement over-current protection when the motor is locked. The ripple signal of the motor running is collected by the capacitor C12. The signal is amplified by the internal unit of the resistor R15, capacitor C6 and operational amplifier U2 and then output to the main control chip U1 through the first pin of the operational amplifier U2 to realize the automatic window closing function when parking. . At the same time, the window motor M is started with an appropriate delay, and then the BEM ripple signal is detected, which can avoid the influence of the instantaneous overshoot of the motor at the initial stage of the anti-pinch threshold setting; through the armature BEM signal transformer T1 The pulse output and counting scheme can determine the current position of the window in real time, and determine whether the window is enabled with the anti-pinch function according to the above-determined anti-pinch area.

The above are only the embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent transformations made using the content of the description and drawings of the present invention, or directly or indirectly applied in related technical fields, are included in the same reasoning. Within the scope of patent protection of the present invention.

Claims

A multifunctional mutual inductance type electric window anti-pinch controller, which is characterized in that it includes a control circuit and an armature BEM signal transformer T1, the control circuit includes a main control chip U1, and the armature BEM signal transformer T1 includes Primary winding and secondary winding;

One end of the primary winding and one end of the secondary winding are grounded at the same time, the other end of the primary winding is used to connect the BEM ripple signal, and the other end of the secondary winding is connected to one end of the main control chip U1 Electrical connection

The main control chip U1 is used to generate an anti-pinch control signal that can control the operation of the window motor M according to the pulse width deformation of the BEM ripple signal.
The multifunctional mutual inductance type power window anti-pinch controller according to claim 1, wherein the control circuit further comprises an operational amplifier U2, a Schmitt trigger U5 and a driving chip U4;

The other end of the secondary winding is electrically connected to the sixth pin of the operational amplifier U2, and the seventh pin of the operational amplifier U2 is electrically connected to the first pin of the Schmitt trigger U5 after passing through an RC filter circuit. Connected, the twelfth pin of the Schmitt trigger U5 is electrically connected to the second pin of the main control chip U1;

The tenth pin of the main control chip U1 is electrically connected to the first pin of the drive chip U4, and the eleventh pin of the main control chip U1 is electrically connected to the second and third pins of the drive chip U4 , The seventh pin and the eighth pin of the driving chip U4 generate a driving signal capable of driving the relay K1 to control the operation of the window motor M.
The multifunctional mutual inductance power window anti-pinch controller according to claim 2, characterized in that it further comprises a resistor R13, one end of the resistor R13 is electrically connected to one end of the primary winding and the other end is connected to the main winding. The fourteenth pin of the control chip U1 is electrically connected.
The multifunctional mutual inductance type power window anti-pinch controller according to claim 2, characterized in that it further comprises a capacitor C12, a resistor R15 and a capacitor C6;

One end of the capacitor C12 is connected to the input voltage signal and the other end is simultaneously electrically connected to the second pin of the operational amplifier U2, one end of the resistor R15, and one end of the capacitor C6. The other end of the resistor R15 is electrically connected to the The other end of the capacitor C6 is simultaneously electrically connected to the first pin of the operational amplifier U2, and the first pin of the operational amplifier U2 is electrically connected to the eighteenth pin of the main control chip U1.
The multifunctional mutual inductance type power window anti-pinch controller according to any one of claims 1 to 4, wherein the primary winding includes a primary magnetic ring and constantan for winding the primary magnetic ring 1-2 turns The constantan wire has a diameter of 1.5mm and a resistance value of 5-10 milliohms, the secondary winding includes a secondary magnetic ring and an enameled wire wound around the secondary magnetic ring 500-1000 times, the The diameter of the enameled wire is 0.1mm.
The multifunctional mutual inductance type electric window anti-pinch controller according to any one of claims 2 to 4, characterized in that it further comprises a voltage stabilizing circuit, and the voltage stabilizing circuit includes a three-terminal power supply voltage stabilizing chip U3, a diode D1, and a voltage stabilizing circuit. Capacitor C7 and capacitor C8;

The anode of the diode D1 is connected to the input voltage signal and the cathode is simultaneously electrically connected to the first pin of the three-terminal power supply regulator chip U3 and one end of the capacitor C7, and the third terminal of the three-terminal power supply regulator chip U3 The pin is electrically connected to the first pin of the main control chip U1, the eighth pin of the operational amplifier U2, the fourteenth pin of the Schmitt trigger U5, and one end of the capacitor C8 at the same time. The second pin of the terminal power supply regulator chip U3, the other end of the capacitor C7 and the other end of the capacitor C8 are grounded.
The multifunctional mutual inductance type electric window anti-pinch controller according to claim 6, wherein the input voltage signal is 12V, and the output voltage signal of the third pin of the three-terminal power supply regulator chip U3 is 5V .
A mutual inductance type electric window anti-pinch control method is characterized in that it comprises the following steps:

S1. Collect the BEM ripple signal of the window motor M;

S2. Determine whether the pulse width deformation of the BEM ripple signal is greater than a preset threshold, and if so, generate an anti-pinch control signal to control the operation of the window motor M.
The mutual inductance type power window anti-pinch control method according to claim 8, wherein the step S2 specifically includes the following steps:

It is judged whether the time after the start of the window motor M reaches the preset delay time, if it is, it is judged whether the pulse width deformation of the BEM ripple signal is greater than the preset threshold, and if it is, an anti-pinch control signal is generated to control The window motor M runs, and the preset delay time is between 40ms-60ms.
The mutual inductance type power window anti-pinch control method according to claim 8, wherein the step S2 specifically includes the following steps:

Read the current position of the car window and the key input signal. If the key input signal is a window lift signal, output a switch signal to drive the window motor M to move up and down. If the window lift signal is a window lift signal , The BEM pulse signal is counted up to obtain the real-time position of the car window, if the window lift signal is a window down signal, the BEM pulse signal is counted down to obtain the real-time position of the car window, The BEM pulse signal is a digital pulse signal obtained after the Schmitt trigger U5 converts the BEM ripple signal;

Determine whether the real-time position of the car window is in the anti-pinch area, if so, determine whether the pulse width deformation of the BEM ripple signal is greater than a preset threshold, and if so, generate an anti-pinch control signal to control the reverse rotation of the window motor M , The anti-pinch area is between the minimum value of the window rise and the maximum value of the window rise, and the range of the minimum value of the window rise is between 30mm and 80mm when the window rises from the bottom end, and the window rises The highest value ranges from 3mm to 5mm from the top of the car window.