A rear-mounted seat anti-pinch device for a vehicle

Abstract

The utility model relates to automobile seat anti -pinch technical field discloses a kind of automobile rear-mounted seat anti -pinch devices of abnormal pressure can be detected and send alarm, including piezoelectric sensing module (110), signal amplification module (120), signal comparison module (130) and control module (140), wherein, signal comparison module (130) compares the input with reference signal The electrical signal, and according to the comparison result, output level signal;Control module (140) is used to receive level signal, and according to the level state of input level signal, corresponding output alarm signal or no output.

Description

Technical Field

[0001] This utility model relates to the field of anti-pinch technology for automobile seats, and more specifically, to an anti-pinch device for aftermarket automobile seats. Background Technology

[0002] With the continuous improvement of automotive intelligence and safety performance, passenger safety has received increasing attention. Currently, anti-pinch windows have become standard equipment in most models, effectively preventing the risk of injury to passengers (especially children) during the window's upward movement. However, compared to windows, power seats (especially those that can move forward and backward and have reclining backrests) also pose a significant mechanical risk of injury during adjustment, yet this has long been overlooked by the market.

[0003] Such risks are particularly prominent in family car use. For example, when children are operating or playing alone in the back seat, they are easily trapped between the adjusting seat (such as a sliding rear seat or a reclined backrest) and the vehicle's interior (such as the front seatback or dashboard). Due to their weak strength and slow reaction time, this can cause serious injury or even suffocation in a very short time. In recent years, several such tragedies have occurred both domestically and internationally, raising strong public concern about seat safety features. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide an anti-pinch device for automotive aftermarket seats that can detect abnormal pressure and issue an alarm, addressing the significant risk of mechanical pinching during the adjustment process of existing electric seats.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an anti-pinch device for rear-mounted automotive seats, comprising:

[0006] A piezoelectric sensing module is disposed on the back end surface of the seat to acquire the compression signal generated when the back end surface is pressed when the seat is used, and convert the compression signal into an electrical signal.

[0007] A signal amplification module, whose signal input terminal is connected to the output terminal of the piezoelectric sensing module, is used to receive the electrical signal and amplify the input electrical signal.

[0008] The signal comparison module has one end used to receive a reference signal.

[0009] The other input terminal of the signal comparison module is coupled to the output terminal of the signal amplification module, and is used to receive the amplified electrical signal.

[0010] The signal comparison module compares the input electrical signal with the reference signal and outputs a level signal based on the comparison result.

[0011] The control module has one input terminal connected to the output terminal of the signal comparison module, which is used to receive the level signal and output an alarm signal or no output according to the level state of the input level signal.

[0012] In some implementations, the signal comparison module compares the input electrical signal with the reference signal.

[0013] When the input electrical signal is less than the reference signal, the signal comparison module outputs a low-level signal.

[0014] When the input electrical signal is greater than the reference signal, the signal comparison module outputs a high-level signal.

[0015] When the input signal to the control module is high, the control module outputs an alarm signal accordingly.

[0016] When the input signal to the control module is low, the control module has no output.

[0017] In some embodiments, the signal amplification module includes at least one operational amplifier.

[0018] The inverting input of the operational amplifier is connected to the first terminal of the piezoelectric sensing module via a first resistor.

[0019] The non-inverting input of the operational amplifier is connected to the second terminal of the piezoelectric sensing module, and is used to receive the electrical signal converted by the piezoelectric sensing module.

[0020] The output of the operational amplifier is coupled to one of the inputs of the signal comparison module.

[0021] In some embodiments, the signal amplification module further includes a second resistor and a third resistor.

[0022] One end of the second resistor is connected to the inverting input of the operational amplifier.

[0023] The other end of the second resistor is connected to the output terminal of the operational amplifier.

[0024] One end of the third resistor is connected to the non-inverting input of the operational amplifier.

[0025] The other end of the third resistor is connected to the common terminal.

[0026] In some embodiments, the signal comparison module includes at least a signal comparator.

[0027] The non-inverting input of the signal comparator is connected to the output of the operational amplifier via a fourth resistor, and is used to receive the amplified electrical signal.

[0028] The inverting input of the signal comparator is connected to one end of the voltage divider circuit to acquire the reference signal, compare the input electrical signal with the reference signal, and then output the corresponding level signal based on the comparison result.

[0029] The output of the signal comparator is connected to an input of the control module to receive the level signal and output an alarm signal or no output according to the state of the level signal.

[0030] In some embodiments, the voltage divider circuit includes a fifth resistor and a sixth resistor connected in series.

[0031] One end of the fifth resistor is connected to the power supply terminal.

[0032] The connection terminals of the fifth resistor and the sixth resistor are connected to the inverting input of the signal comparator.

[0033] One end of the sixth resistor is connected to the common terminal.

[0034] The automotive rear-mounted seat anti-pinch device of this utility model includes a piezoelectric sensing module, a signal amplification module, a signal comparison module, and a control module. The signal comparison module compares the input electrical signal with a reference signal and outputs a level signal based on the comparison result. The control module receives the level signal and outputs an alarm signal or no output according to the level state of the input level signal. Compared with existing technologies, through high-precision sensing modules (such as current Hall sensors and pressure film sensors) and intelligent control, it can monitor changes in resistance during seat adjustment in real time. Once abnormal resistance is detected (i.e., encountering a occupant's limb or a foreign object), it immediately triggers an emergency stop and automatically reverses a distance, thereby quickly releasing the pinched object.

[0035] Furthermore, by employing a multi-signal fusion judgment strategy (such as combining motor current / torque mutations and seat movement distance information) instead of relying on a single signal source, this design greatly improves the accuracy of clamping event recognition.

[0036] High sensitivity: It can detect minute changes in resistance and respond quickly even when obscured by soft clothing or a child's small arm;

[0037] Low false alarm rate: It can effectively distinguish between normal resistance (such as frictional resistance and vibration from bumpy roads) and abnormal clamping resistance, preventing the normal user experience and user trust from being affected by false system triggers. Attached Figure Description

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0039] Figure 1 This is a schematic diagram of the installation of the piezoelectric sensing module of an embodiment of the automotive aftermarket seat anti-pinch device provided by this utility model;

[0040] Figure 2 This is a circuit diagram of an embodiment of the automotive rear-mounted seat anti-pinch device provided by this utility model. Detailed Implementation

[0041] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0042] like Figures 1-2 As shown, in the first embodiment of the automotive rear-mounted seat anti-pinch device of this utility model, the automotive rear-mounted seat anti-pinch device includes a piezoelectric sensing module 110, a signal amplification module 120, a signal comparison module 130, and a control module 140.

[0043] in, Figure 1 A typical mounting location for the piezoelectric sensing module 110 is shown;

[0044] The piezoelectric sensing module 110 is flatly attached to the upper-middle area of ​​the front of the backrest of the rear seat 10 of the car (i.e., the side facing the occupant) via the self-adhesive on its back. This area is the part most likely to be contacted when pressure occurs. During installation, it should be ensured that the piezoelectric sensing module 110 is in full contact with the seat surface without bubbles or wrinkles.

[0045] refer to Figure 2 The piezoelectric sensing module 110 is used to detect when the back is pressed. The piezoelectric film converts the mechanical signal into an electrical signal and then outputs it to the signal amplification module 120.

[0046] The electrical signal input signal amplification module 120 amplifies and filters the signal to improve the signal-to-noise ratio and signal strength.

[0047] The signal comparison module 130 is equipped with a reference signal, which is used to receive the conditioned electrical signal and compare it with a preset reference signal / voltage.

[0048] When the electrical signal acquired by the piezoelectric sensing module 110 exceeds the reference signal / voltage, the output level of the signal comparison module 130 changes, outputting a high-level signal to trigger the control module 140 to work, and outputs a corresponding control signal to drive the buzzer to sound or the LED to flash, thereby realizing the alarm function.

[0049] Specifically, the piezoelectric sensing module 110 is disposed on the back end surface of the seat 10 to acquire the compression signal generated when the back end surface is pressed when the seat is used, convert the compression signal into an electrical signal, and then output the electrical signal to the signal amplification module 120.

[0050] Furthermore, the signal input terminal of the signal amplification module 120 is connected to the output terminal of the piezoelectric sensing module 110, and is used to receive the electrical signal acquired by the piezoelectric sensing module 110, amplify the input electrical signal, and then output it to the signal comparison module 130.

[0051] Specifically, one end of the signal comparison module 130 is used to receive a reference signal.

[0052] The other input terminal of the signal comparison module 130 is coupled to the output terminal of the signal amplification module 120, and is used to receive the amplified electrical signal.

[0053] The signal comparison module 130 compares the input electrical signal with the reference signal and outputs a level signal based on the comparison result;

[0054] An input terminal of the control module 140 is connected to the output terminal of the signal comparison module 130 to receive a level signal and output an alarm signal or no output according to the level state (high / low level) of the input level signal.

[0055] Using this technical solution, through high-precision sensing modules (such as current Hall sensors and pressure film sensors) and intelligent control, it is possible to monitor the resistance changes during the seat adjustment process in real time. Once abnormal resistance is detected (i.e., encountering a occupant's limb or a foreign object), an emergency stop is immediately triggered and the seat automatically reverses a distance, thereby quickly releasing the trapped object.

[0056] Furthermore, by employing a multi-signal fusion judgment strategy (such as combining motor current / torque mutations and seat movement distance information) instead of relying on a single signal source, this design greatly improves the accuracy of clamping event recognition.

[0057] High sensitivity: It can detect minute changes in resistance and respond quickly even when obscured by soft clothing or a child's small arm;

[0058] Low false alarm rate: It can effectively distinguish between normal resistance (such as frictional resistance and vibration from bumpy roads) and abnormal clamping resistance, preventing the normal user experience and user trust from being affected by false system triggers.

[0059] In some implementations, such as Figure 2 As shown, to ensure the reliability of the output alarm signal, the input electrical signal can be compared with a reference signal through the signal comparison module 130.

[0060] When the input electrical signal is less than the reference signal, the signal comparison module 130 outputs a low-level signal.

[0061] When the input electrical signal is greater than the reference signal, the signal comparison module 130 outputs a high-level signal.

[0062] When the input signal to the control module 140 is high, the control module 140 outputs an alarm signal.

[0063] When the input control module 140 signal is low, the control module 140 has no signal output.

[0064] In some implementations, such as Figure 2 As shown, to ensure the amplification effect of the input signal, an operational amplifier U101 can be set in the signal amplification module 120, which has the function of signal amplification;

[0065] Specifically, the inverting input (corresponding to pin 4) of operational amplifier U101 is connected to the first terminal (corresponding to pin 1) of piezoelectric sensing module 110 through the first resistor R101, and is used to receive the electrical signal converted by piezoelectric sensing module 110.

[0066] The non-inverting input (pin 3) of operational amplifier U101 is connected to the second terminal (pin 2) of piezoelectric sensing module 110 to receive the electrical signal converted by piezoelectric sensing module 110.

[0067] The output terminal (corresponding to pin 1) of the operational amplifier U101 is coupled to an input terminal of the signal comparison module 130, and outputs the amplified electrical signal to the signal comparison module 130.

[0068] In some implementations, such as Figure 2 As shown, the signal amplification module 120 also includes a second resistor R102 and a third resistor R103. The second resistor R102 is a negative feedback resistor. By changing the ratio of the feedback resistor to the input resistor, the closed-loop gain of the operational amplifier U101 can be set, while suppressing gain fluctuations caused by non-ideal factors such as temperature drift.

[0069] The third resistor R103 is a balancing resistor, which is used to maintain the symmetry of the input stage of operational amplifier U101, eliminate the offset voltage caused by the input bias current, and improve the accuracy and stability of the circuit.

[0070] Specifically, one end of the second resistor R102 is connected to the inverting input (corresponding to pin 4) of the operational amplifier U101.

[0071] The other end of the second resistor R102 is connected to the output terminal (corresponding to pin 1) of the operational amplifier U101, and is used to feed back the signal of the operational amplifier U101 to its inverting input (corresponding to pin 4).

[0072] One end of the third resistor R103 is connected to the non-inverting input (pin 3) of the operational amplifier U101.

[0073] The other end of the third resistor R103 is connected to the common terminal.

[0074] In some implementations, such as Figure 2 As shown, to ensure the reliability of the output alarm signal, a signal comparator U102 can be set in the signal comparison module 130, which has the functions of signal comparison and level output;

[0075] Specifically, the non-inverting input (pin 3) of the signal comparator U102 is connected to the output (pin 1) of the operational amplifier U101 through the fourth resistor R104. The electrical signal amplified by the operational amplifier U101 is input to the non-inverting input (pin 3) of the signal comparator U102 through the fourth resistor R104.

[0076] The inverting input (corresponding to pin 4) of signal comparator U102 is connected to one end of voltage divider circuit 131 to receive the voltage signal formed after voltage division by voltage divider circuit 131. This voltage signal serves as the reference signal / voltage for signal comparator U102.

[0077] The signal comparator U102 compares the input electrical signal with the reference signal and then outputs a corresponding level signal (high level / low level) based on the comparison result.

[0078] Specifically, when the voltage level at the non-inverting input (pin 3) of signal comparator U102 is higher than the voltage at its inverting input (pin 4), signal comparator U102 outputs a high-level signal.

[0079] When the voltage level at the non-inverting input (pin 3) of signal comparator U102 is lower than the voltage at its inverting input (pin 4), signal comparator U102 outputs a low-level signal.

[0080] The output terminal (corresponding to pin 1) of signal comparator U102 is connected to an input terminal (corresponding to pin 1) of control module 140 to receive level signals.

[0081] When the level signal at one input terminal (corresponding to pin 1) of the input control module 140 is high, the control module 140 outputs an alarm signal accordingly.

[0082] When the level signal of one input terminal (corresponding to pin 1) of the input control module 140 is low, the control module 140 has no signal output.

[0083] In some implementations, such as Figure 2 As shown, to ensure the reliability of the output alarm signal, a fifth resistor R105 and a sixth resistor R106 can be set in the voltage divider circuit.

[0084] Among them, the fifth resistor R105 and the sixth resistor R106 are connected in series.

[0085] One end of the fifth resistor R105 is connected to the power supply terminal (corresponding to VCC).

[0086] The terminals of the fifth resistor R105 and the sixth resistor R106 are connected to the inverting input (pin 4) of the signal comparator U102. The voltage signal input from the power supply terminal (VCC) is divided by the fifth resistor R105 and the sixth resistor R106, and then input to the inverting input (pin 4) of the signal comparator U102 as the reference signal / voltage for its inverting input (pin 4).

[0087] One end of the sixth resistor R106 is connected to the common terminal GND.

[0088] Specifically, at least one flexible strip-shaped piezoelectric sensing module 100 is installed on the back of the car seat, and multiple modules can be installed in parallel according to the actual area.

[0089] Among them, the piezoelectric film has a unique piezoelectric effect, which can convert mechanical energy and electrical energy into each other. When the back is pressed, the piezoelectric film converts the mechanical signal into an electrical signal. By adjusting the threshold of the voltage at the alarm end, when the deformation of the piezoelectric strip reaches a certain level, the anti-pinch sound and light alarm is triggered to remind the car owner that the seat has pinched something (or a person).

[0090] The flexible piezoelectric sensing module 110 will not cause injury to the people in the rear seats during emergency braking, and can also be installed on the inside of the seat cover (if any) without affecting its function.

[0091] The piezoelectric sensing module 110 can be a piezoresistive resistor or other flexible material.

[0092] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A retrofitted anti-pinch device for automotive seats, characterized in that, have: A piezoelectric sensing module is disposed on the back end surface of the seat to acquire the compression signal generated when the back end surface is pressed when the seat is used, and convert the compression signal into an electrical signal. A signal amplification module, whose signal input terminal is connected to the output terminal of the piezoelectric sensing module, is used to receive the electrical signal and amplify the input electrical signal. The signal comparison module has one end used to receive a reference signal. The other input terminal of the signal comparison module is coupled to the output terminal of the signal amplification module, and is used to receive the amplified electrical signal. The signal comparison module compares the input electrical signal with the reference signal and outputs a level signal based on the comparison result. The control module has one input terminal connected to the output terminal of the signal comparison module, which is used to receive the level signal and output an alarm signal or no output according to the level state of the input level signal.

2. The automotive rear-mounted seat anti-pinch device according to claim 1, characterized in that, The signal comparison module compares the input electrical signal with the reference signal. When the input electrical signal is less than the reference signal, the signal comparison module outputs a low-level signal. When the input electrical signal is greater than the reference signal, the signal comparison module outputs a high-level signal. When the input signal to the control module is high, the control module outputs an alarm signal accordingly. When the input signal to the control module is low, the control module has no output.

3. The automotive rear-mounted seat anti-pinch device according to claim 2, characterized in that, The signal amplification module includes at least one operational amplifier. The inverting input of the operational amplifier is connected to the first terminal of the piezoelectric sensing module via a first resistor. The non-inverting input of the operational amplifier is connected to the second terminal of the piezoelectric sensing module, and is used to receive the electrical signal converted by the piezoelectric sensing module. The output of the operational amplifier is coupled to one of the inputs of the signal comparison module.

4. The automotive rear-mounted seat anti-pinch device according to claim 3, characterized in that, The signal amplification module also includes a second resistor and a third resistor. One end of the second resistor is connected to the inverting input of the operational amplifier. The other end of the second resistor is connected to the output terminal of the operational amplifier. One end of the third resistor is connected to the non-inverting input of the operational amplifier. The other end of the third resistor is connected to the common terminal.

5. The automotive rear-mounted seat anti-pinch device according to claim 3, characterized in that, The signal comparison module includes at least a signal comparator. The non-inverting input of the signal comparator is connected to the output of the operational amplifier via a fourth resistor, and is used to receive the amplified electrical signal. The inverting input of the signal comparator is connected to one end of the voltage divider circuit to acquire the reference signal, compare the input electrical signal with the reference signal, and then output the corresponding level signal based on the comparison result. The output of the signal comparator is connected to an input of the control module to receive the level signal and output an alarm signal or no output according to the state of the level signal.

6. The automotive rear-mounted seat anti-pinch device according to claim 5, characterized in that, The voltage divider circuit includes a fifth resistor and a sixth resistor connected in series. One end of the fifth resistor is connected to the power supply terminal. The connection terminals of the fifth resistor and the sixth resistor are connected to the inverting input of the signal comparator. One end of the sixth resistor is connected to the common terminal.

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