A method and device for unlocking a car door without a key

Abstract

The present invention discloses a method and device for unlocking automobile doors in a keyless situation. A door handle module is arranged on each door handle, and each door handle module includes a Bluetooth transmitter module and a pressure sensor. A capacitive touch button is also arranged on the left front door handle module and the right front door handle module. All the Bluetooth transmitter modules wirelessly transmit the received pressure and button signals to a main control chip. The main control chip is bidirectionally connected to a pressure processing module and a signal processing module respectively. The output end of the main control chip is respectively connected to a GSM text message module, a buzzer module and a BCM module. Pulling the door handle is used as a signal input, and unlocking is achieved by pulling the door handles in sequence, or by pulling the handles of four doors at the same time. This can effectively solve the problem that the owner needs to open the door when he does not have a car key. The method also has the function of notifying the owner of the unlocking status, thereby improving safety and reliability.

Description

Technical Field

[0001] The invention relates to the field of vehicle safety, and in particular to a method for unlocking a car door, in particular to emergency unlocking of a car door without a key. Background Art

[0002] In recent years, with the development of vehicle technology, the ways to unlock cars have become increasingly diverse, including mechanical key unlocking, remote key unlocking, smart key unlocking, etc. However, in actual use of cars, users often forget to bring their keys, lose their keys, lose their keys, lose their keys, are stolen, or are locked in the car. This not only brings inconvenience to car owners, but also poses a great safety hazard. In addition, in severe weather conditions such as severe cold and heat, if there are elderly people, children, or pets with limited mobility stranded in the car, their lives are likely to be threatened, and rescue personnel outside the car can only forcibly break the car locks or windows.

[0003] At present, relevant technologies have been used to solve the above problems. For example, the door unlocking system disclosed in the document with Chinese patent number CN201910144916.7 and titled "A door unlocking system involving biometric identification and NFC authentication" can unlock the door through NFC authentication and fingerprint authentication, but the problems are: First, when outdoors, the fingerprint characteristics of the owner are not obvious, the success rate of fingerprint recognition is low, or when the finger is injured, the fingerprint cannot be recognized, resulting in an inability to unlock in an emergency. Second, the user is borrowing the owner's car, and the authentication information is not stored in the user's mobile phone NFC. In this case, once the door is locked, the user cannot unlock the door. The door unlocking method disclosed in the document with Chinese patent number CN201910585798.3 and titled “A method for unlocking a door” unlocks the door through cooperation between rescuers outside the vehicle and the rescued person inside the vehicle. However, there is a problem: if the person waiting to be rescued in the vehicle is a pet or an infant or an elderly person who has no ability to cooperate, the cooperative unlocking action inside the vehicle cannot be completed. Therefore, this unlocking method has obvious limitations. Summary of the invention

[0004] The purpose of the present invention is to address the shortcomings and defects of the current car door unlocking method without a key, and to propose a car door unlocking method and device suitable for car owners, non-car owners and rescue personnel to open the car door without a key.

[0005] The technical solution adopted by the keyless car door unlocking device of the present invention is as follows: each door handle is provided with a door handle module, each door handle module includes a Bluetooth transmitter module and a pressure sensor, and the left front door handle module and the right front door handle module are also provided with a capacitive touch button, and the pressure sensor and the capacitive touch button on the same door handle transmit pressure and key signals to the Bluetooth transmitter module; all Bluetooth transmitter modules wirelessly transmit the received pressure and key signals to the main control chip;

[0006] The main control chip is bidirectionally connected to the pressure processing module and the signal processing module respectively, and the output end of the main control chip is connected to the GSM SMS module, the buzzer module and the BCM module respectively;

[0007] The pressure processing module receives the pressure signal transmitted by the main control chip, determines whether the corresponding door handle is pulled up, and the main control chip obtains the signal code of pulling up the four door handles and transmits it to the signal processing module;

[0008] The signal processing module stores the signal codes for pulling up the four door handles. If the signal code obtained by the main control chip is consistent with the signal code in the signal processing module, the buzzer module is controlled to sound, the GSM module sends a text message to the owner's mobile phone, and the BCM module is unlocked.

[0009] The technical solution adopted by the first method for unlocking a car door without a key is as follows: the unlocking person knows the vehicle unlocking sequence,

[0010] Step 1): Press the capacitive touch button and pressure sensor 2 on the left front door handle, and the button signal and pressure signal are simultaneously transmitted to the main control chip via the Bluetooth transmitter module, and the main control chip transmits the pressure signal to the pressure processing module;

[0011] Step 2): The pressure processing module compares the received pressure with the stored set pressure range. If the received pressure is within the pressure range, the judgment result that the door handle is pulled up is sent back to the main control chip, and the main control chip controls the buzzer module to beep twice;

[0012] Step 3): The unlocker pulls up the corresponding door handle in sequence according to the unlocking sequence, and the main control chip transmits four pressure signals to the pressure processing module in sequence. The pressure processing module determines whether the range of the four pressures is within the set pressure range. If so, the main control chip transmits the signal code of the sequence corresponding to pulling up the door to the signal processing module;

[0013] Step 4): The signal processing module compares the signal code sent by the main control chip with the stored signal code. If the two are consistent, the BCM module is unlocked, otherwise the main control chip does not work.

[0014] The technical solution adopted by the second method for unlocking a car door without a key is that the unlocking person does not know the vehicle unlocking sequence.

[0015] Step 1): Press the capacitive touch button and pressure sensor on the left front door handle, and the button signal and pressure signal are simultaneously transmitted to the main control chip via the Bluetooth transmitter module;

[0016] Step 2): The main control chip transmits the pressure signal to the pressure processing module, and the pressure processing module compares the received pressure with the stored set pressure range. If the received pressure is within the pressure range, the judgment result that the door handle is pulled up is sent back to the main control chip, and the main control chip controls the buzzer module to beep twice;

[0017] Step 3): Pull up four door handles at the same time, the main control chip transmits four pressure signals to the pressure processing module at the same time, and the pressure processing module determines whether the range of the four pressures is within the set pressure range. If so, the main control chip will simultaneously transmit the four door pull-up signal codes to the signal processing module;

[0018] Step 4): The signal processing module compares the received signal code with the stored signal code. If the two are consistent, the BCM module is unlocked. Otherwise, the main control chip does not work.

[0019] The beneficial effects of the present invention after adopting the above technical solution are:

[0020] 1. The present invention uses the action of pulling the door handle as a signal input. The door can be unlocked simply by pulling the door handle, which is an inherent part of the door. This can effectively solve the problem that the owner needs to open the door when he does not have a car key, and also has the function of notifying the owner of the unlocking status, thereby improving safety and reliability.

[0021] 2. The present invention comprehensively considers various situations of keyless unlocking, and has two unlocking methods, which can provide corresponding unlocking methods for different unlocking personnel, making the unlocking more widely applicable and convenient to use. The first unlocking method is: if the owner or other personnel who know the door unlocking signal sequence urgently needs to enter the car, they can unlock the door by pulling the door handles in sequence, which provides the owner with an option to unlock the door without the car key. In an emergency, when passers-by need to rescue people or pets locked in the car, they can use the second unlocking method of the present invention: pull the handles of the four doors at the same time to unlock, providing a safer and more effective unlocking method for rescue personnel outside the car, without the need for cooperation from people in the car and without breaking windows and locks, providing a way of unlocking that will not damage the vehicle for those who are rescuing the elderly, children or pets with limited mobility in the car. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] Figure 1 It is a structural block diagram of a keyless vehicle door unlocking device of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure of the center left front door handle module installed on the handle. DETAILED DESCRIPTION

[0025] See also Figure 1 , a keyless car door unlocking device includes four door handle modules, a main control chip 41, a pressure processing module 51, a signal processing module 52, a GSM text message module 61, a buzzer module 71 and a BCM module 81. It should be noted that the present invention is aimed at a car with four doors, and a door handle module is installed on each door. The driver's side door handle module is the left front door handle module 01, and the other three are the right front door handle module 02, the left rear door handle module 03 and the right rear door handle module 04. Therefore, there are four door handle modules in total. The four door handle modules are respectively connected to the battery of the vehicle and powered by the battery.

[0026] Each door handle module includes a Bluetooth transmitter module and a pressure sensor. The pressure sensor is connected to the Bluetooth transmitter module via a signal line. In addition, a capacitive touch button is installed on each of the two door handle modules, the left front door handle module 01 and the right front door handle module 02. The capacitive touch button is connected to the Bluetooth transmitter module on the corresponding door via a signal line. Specifically: the left front door handle is installed with a left front door handle module 01, which is composed of a capacitive touch button 11, a Bluetooth transmitter module 31 and a pressure sensor 21; the right front door handle is installed with a right front door handle module 02, which is composed of a capacitive touch button 12, a Bluetooth transmitter module 32 and a pressure sensor 22; the left rear door handle is installed with a left rear door handle module 03, which is composed of a Bluetooth transmitter module 33 and a pressure sensor 23; the right rear door handle is installed with a right rear door handle module 04, which is composed of a Bluetooth transmitter module 34 and a pressure sensor 24.

[0027] See also Figure 2The left front door handle of the car in the figure is a universal pull-out door handle, in which a capacitive touch button 11, a pressure sensor 21 and a Bluetooth transmitter module 31 are installed. The capacitive touch button 11 and the pressure sensor 21 are respectively connected to the Bluetooth transmitter module 31 via signal lines, and the corresponding signals are transmitted to the Bluetooth transmitter module 31. Considering the habit of opening the door, the left front door, i.e., the door on the driver's side of the vehicle, is usually opened with the left hand, i.e., when the person pulls the door handle, the thumb will be closer to the rear side of the vehicle. Therefore, the capacitive touch button 11 is set at a position where the handle is biased toward the rear side of the vehicle, so that the thumb can press the button from the outside to the inside. Similarly, for the front right front door, the door is usually opened with the right hand, and when the person pulls the right front door handle, the thumb will also be closer to the rear side of the vehicle. Therefore, the capacitive touch button 12 is set at a position where the front right front door handle is biased toward the rear side of the vehicle. When the thumb of the person presses the capacitive touch button 11, the generated button capacitance signal is transmitted to the Bluetooth transmitter module 31. The left rear door handle and right rear door are not equipped with capacitive touch buttons.

[0028] The pressure sensor 21 is placed in the middle of the inner side of the left front door handle. When the door handle is pulled, the palm is generally in the middle of the inner handle. The pressure sensor 21 is placed here to more effectively and accurately measure the pressure when the door handle is pulled. The sensing is more sensitive, accurate and in line with habits. When the door handle is pulled, the pressure signal is transmitted to the Bluetooth transmitter module 31 through the pressure sensor 21. The Bluetooth transmitter module 31 is placed near the front of the car, so that the three devices of the capacitive touch button 11, the pressure sensor 21 and the Bluetooth transmitter module 31 are evenly distributed.

[0029] The arrangement of the pressure sensors 21 and the Bluetooth transmission modules 31 in the four vehicle doors is exactly the same.

[0030] The capacitive touch buttons 11 and 12 need to set the logic value of the pin, and set their sensitivity to a range that can be activated by human hands but not by objects such as gloves. In this way, the capacitive touch buttons 11 and 12 will only transmit signals to the Bluetooth transmitting modules 31 and 32 when they are touched by human hands. Otherwise, the capacitive touch buttons 11 and 12 will not transmit signals to the Bluetooth transmitting modules 31 and 32, which can improve the safety of the vehicle.

[0031] Since the volume of the door handle is relatively small and the vehicle is relatively large, it is inconvenient to introduce too many wirings, so the present invention adopts a Bluetooth transmitter module. The Bluetooth transmitter modules 31, 32, 33, and 34 on the four door handles respectively transmit the received pressure signals and key signals to the main control chip 41 via wireless transmission, so that the main control chip 41 can process the information.

[0032] The main control chip 41 is bidirectionally connected to the pressure processing module 51 and the signal processing module 52 , respectively. The output end of the main control chip 41 is connected to the GSM short message module 61 , the buzzer module 71 and the BCM module 81 , respectively.

[0033] The pressure processing module 51 is composed of EEPROM (Electrically Erasable Programmable Read Only Memory), which is a storage chip that does not lose data after power failure. The pressure processing module 51 receives the pressure signal transmitted by the main control chip 41 and determines whether the corresponding door handle is pulled up: the pressure processing module 51 stores a preset pressure range P1∽P2, where P1 is the lower limit of pressure, the minimum value, and P2 is the upper limit of pressure, the maximum value. When the pressure range of the pressure signal received by the pressure processing module 51 is P1∽P2, it is determined that the corresponding door handle is pulled up, otherwise, the door handle is not pulled up.

[0034] The pressure processing module 51 transmits the judgment result to the main control chip 41, and the main control chip 41 obtains the signal of pulling up the four door handles and obtains the signal code of pulling up the four door handles. The main control chip 41 transmits the obtained signal code of pulling up the four door handles to the signal processing module 52.

[0035] When the unlocking person pulls the door handle, a certain pressure will be generated on the inner surface of the door handle. A pressure range P1∽P2 can be determined through a large number of research experiments. If the pressure output by the pressure sensors 21, 22, 23, and 24 is within the range P1∽P2, it is recorded that the door handle is in the pulled-up state.

[0036] The signal processing module 52 is composed of two EEPROMs, each storing two different codes corresponding to the two unlocking modes of the present invention. The first signal code is the sequence code for pulling up the four doors, i.e., the unlocking sequence code, and the second decoding is the signal code for pulling up the four doors at the same time.

[0037] The signal processing module 52 compares the signal code obtained by the main control chip 41 with the stored signal code, and sends the comparison result to the main control chip 41 .

[0038] The GSM SMS module 61 communicates with the car owner's mobile phone and is used to send SMS to the car owner's mobile phone. The buzzer module 71 is used to emit one or two beeps through the buzzer to remind the unlocking personnel of the current unlocking status. The BCM module 81 is used to control the car lock to execute unlocking.

[0039] See also Figure 1 and Figure 2 , the present invention provides two door unlocking methods, as follows:

[0040] The first unlocking method: This unlocking method is suitable for the car owner himself or other unlocking persons who know the vehicle unlocking sequence. It is used when the door key is missing, so that the keyless unlocking person outside the car can unlock the door by pulling up the door handle.

[0041] Step 1: In the initial state, the function of the main control chip 41 is limited. The main control chip 41 will transmit the signal to the pressure processing module 51 only after receiving the signal from the Bluetooth transmitter module 31 on the left front door handle. That is, when the capacitive touch button 11 on the left front door handle is pressed and the pressure sensor 21 is pressed, the key signal and the pressure signal are transmitted to the Bluetooth transmitter module 31. At this time, the Bluetooth transmitter module 31 transmits the key signal and the pressure signal to the main control chip 41 at the same time. The main control chip 41 receives the key signal and the pressure signal on the left front door handle at the same time, and transmits the pressure signal to the pressure processing module 51. In addition, if the Bluetooth transmitter modules 32, 33, and 34 on the right front door, left rear door, and right door handle have key signals and pressure signals transmitted to the main control chip 41, the main control chip 41 does not process the signals on these three door handles and does not transmit the pressure signal to the pressure processing module 51.

[0042] The person outside the vehicle needs to press the capacitive touch button 11 with his hand (such as the thumb), and at the same time, the hand (such as the palm) applies pressure to the pressure sensor 21, and then the Bluetooth transmitter module 31 transmits the received key signal of the capacitive touch button 11 and the pressure signal of the pressure sensor 21 to the main control chip 41 at the same time. If the signal received by the main control chip 41 does not contain the capacitive touch button signal, it means that only the pressure signal is received, indicating that only the rear two doors are pulled, and the main control chip 41 does not work; if the signal received by the main control chip 41 contains a key signal, it is determined whether the key signal is a pressure signal transmitted by the Bluetooth transmitter module 31 of the left front door handle module 01 or a pressure signal transmitted by the Bluetooth transmitter module 32 of the right front door handle module 02. If it is a pressure signal transmitted by the Bluetooth transmitter module 32, the main control chip 41 still does not work. If it is a pressure signal transmitted by the Bluetooth transmitter module 31, the main control chip 41 transmits the pressure signal to the pressure processing module 51.

[0043] The present invention does not use touching the capacitive touch button 11 as the only determination method for releasing the functional limitation of the main control chip 41. This is mainly because the working environment of the door handle is complex, and rain and electromagnetic interference may cause the erroneous input of the capacitive touch button 11 signal. If the button is accidentally touched due to environmental factors, resulting in the release of the functional limitation of the main control chip 41, the energy in the battery will be consumed. Being in this situation for a long time will cause the battery to run out of power.

[0044] Step 2: The pressure processing module 51 compares the pressure transmitted by the main control chip 41 with the pressure range P1∽P2 stored in the pressure processing module 51. If the pressure is within the range, the pressure size meets the conditions, and it is determined that the corresponding door handle is pulled up, and this judgment result is sent back to the main control chip 41.

[0045] When the pressure received by the main control chip 41 meets the signal that the door handle is pulled up and the duration of the capacitive touch button signal reaches 5s, that is, the left front door handle is continuously pulled up for 5s, the function restriction of the main control chip 41 in the initial state is lifted. At this time, the main control chip 41 sends a command to the buzzer module 71 to control the buzzer to beep twice to remind the unlocking personnel that the main control chip 41 has lifted the restriction. The door handle can be pulled in sequence according to the sequence of the unlock signal sequence to input the unlock code signal to the main control chip 41. At this time, if the Bluetooth transmitting modules 32, 33, and 34 on the right front door, left rear door, and right door handle have key signals and pressure signals transmitted to the main control chip 41, the main control chip 41 will transmit the pressure signal on the corresponding door handle to the pressure processing module 51.

[0046] After the restriction is lifted by the main control chip 41, if the main control chip 41 has not received the unlock code signal for more than 20 seconds, the main control chip 41 will automatically lock and restore its functions, which is considered as a timeout. That is, if the time interval between the buzzer module 71 beeps twice and the main control chip 41 receiving the signal code exceeds 20 seconds, the main control chip 41 will not work. At this time, if the Bluetooth transmitter modules 32, 33, and 34 on the right front door, left rear door, and right door handle transmit key signals and pressure signals to the main control chip 41, the main control chip 41 will not work.

[0047] Step 3: After the main control chip 41 releases the restriction, the unlocking personnel pulls up the corresponding door handles in sequence according to the known unlocking sequence, and the corresponding Bluetooth transmitting modules 31, 32, 33, and 34 sequentially send the signals in the corresponding door handle modules to the main control chip 41. The main control chip 41 sequentially transmits the four pressure signals to the pressure processing module 51. The pressure processing module 51 determines whether the range of the four pressures is within the set pressure range P1∽P2, and transmits the judgment result back to the main control chip 41. If the judgment result is that the pressure is within the set pressure range P1∽P2, the main control chip 41 transmits the sequence signal code corresponding to the pulled door to the signal processing module 52.

[0048] Step 4: The signal processing module 52 compares the serial signal code sent by the main control chip 41 with the stored first signal code. If the two are consistent, a low-level signal is output to the main control chip 41. The main control chip 41 sends an instruction to the BCM module 81. After receiving the signal, the BCM module 81 issues an instruction to the door lock, and the motor in the lock block drives the door lock pin to unlock the door. If the input is wrong, a high-level signal is output to the main control chip 41, and the main control chip 41 does not work.

[0049] For example, if the first code stored in the signal processing module 52, i.e., the unlocking sequence signal code, is: left front door handle pull-up signal S1—left rear door handle pull-up signal S3—right front door handle pull-up signal S2—right rear door handle pull-up signal S4, and the code is set to S1 S3 S2 S4, then if the unlocking person pulls up the left front door handle, the left rear door handle, the right front door handle, and the right rear door handle in sequence, the unlocking sequence input is correct, and the main control chip 41 receives the low-level signal from the signal processing module 52 and sends a command to the BCM module 81. If the unlocking sequence input is incorrect, the door cannot be unlocked.

[0050] After the door is unlocked successfully, the main control chip 41 sends a command to the buzzer module 71 and the GSM SMS module 61. The buzzer beeps twice to remind the unlocking personnel that the unlocking is successful; the GSM module 61 sends a text message "Unlocking Successfully" to the owner's mobile phone.

[0051] If the unlocking person pulls the door handle in the wrong order, the main control chip 41 only transmits commands to the buzzer module 71 and the GSM text message module 61. The buzzer beeps once to prompt the unlocking person that the unlocking failed; the GSM module 61 sends a text message "Unlocking failed" to the owner's mobile phone.

[0052] The second unlocking method: This unlocking method is suitable for people outside the car who do not know the unlocking sequence code to unlock the car door. For example, in harsh conditions such as high temperature or cold weather, there are also passengers such as the elderly and infants who are unable to open the door by themselves trapped in the car, and people outside the car lack the means to open the door but want to rescue the people inside the car.

[0053] Step A: It is exactly the same as step 1 of the first unlocking method and will not be repeated here.

[0054] Step B: It is exactly the same as step 2 of the first unlocking method, so I will not repeat it here.

[0055] Step C: After the main control chip 41 releases the restriction, the person unlocking the car outside pulls up the four door handles at the same time to unlock the car door. This unlocking method requires at least two people to do it. When pulling the door handles, the hands need to apply pressure to the pressure sensors 21, 22, 23, and 24 at the same time. Since the left front door handle and the right front door handle are equipped with capacitive touch buttons, the two people unlocking the car outside also need to press their hands on the capacitive touch buttons 11 and 12 at the same time to ensure that the capacitive touch buttons 11 and 12 signals will be sent to the main control chip 41 by the Bluetooth transmitting modules 31 and 32. If the signal received by the main control chip 41 does not contain the capacitive touch buttons 11 and 12 signals, the main control chips 11 and 12 will not transmit the pressure signals of the pressure sensors 21 and 22 to the pressure processing module 51. If the signal received by the main control chip 41 includes the signal of the capacitive touch buttons 11 and 12, the main control chip 41 simultaneously transmits the pressure signals received from the four pressure sensors 21, 22, 23, and 24 to the pressure processing module 51. The pressure processing module 51 returns the result of whether the four pressures are within the set pressure range P1∽P2 to the main control chip 41. If it is determined that the four pressures are all within the set range, the main control chip 41 simultaneously transmits the four door pull-up signal codes to the signal processing module 52.

[0056] When the signal processing module 52 simultaneously receives the signal codes of the four doors being pulled up, i.e., S1 S3 S2 S4, which are consistent with the second decoding stored in it, after the condition is met, the signal processing module 52 transmits a low level to the main control chip 41, and the main control chip 41 sends a command to the BCM module 81. After receiving the signal, the BCM module 81 issues a command to the door lock to unlock the door. After the door is successfully unlocked, the main control chip 41 sends a command to the buzzer module 71 and the GSM SMS module 61. The buzzer beeps twice to remind the unlocking personnel that the unlocking is successful; the GSM module 61 sends a text message "unlocking successfully" to the owner's mobile phone. If the signal code of the door being pulled up is input incorrectly and does not meet the condition, a high level is transmitted to the main control chip 41, and the main control chip 41 only transmits the command to the buzzer module 71 and the GSM SMS module 61. The buzzer only beeps once to remind the unlocking personnel that the unlocking failed; the GSM module 61 sends a text message "unlocking failed" to the owner's mobile phone.

[0057] If the door is still not unlocked after 20 seconds, and the main control chip 41 has been in the function-restricted unlocking state for 20 seconds, the restriction of the main control chip 41 will be restored. At this time, if the Bluetooth transmitting modules 32, 33, and 34 on the right front door, left rear door, and right door handle have key signals and pressure signals transmitted to the main control chip 41, the main control chip 41 will not work to prevent misoperation.

[0058] The present invention also installs a capacitive touch button in the right front door handle, which can ensure that two unlocking personnel need to directly touch the door handle with their hands, so that illegal personnel wearing gloves cannot unlock the vehicle, thereby ensuring the safety of the vehicle.

Claims

1. A method for unlocking a car door without a key, wherein each door handle is provided with a door handle module, each door handle module includes a Bluetooth transmitter module and a pressure sensor, and each left front door handle module and right front door handle module are provided with a capacitive touch button, and the pressure sensor and the capacitive touch button on the same door handle transmit pressure and key signals to the Bluetooth transmitter module; all Bluetooth transmitter modules wirelessly transmit the received pressure and key signals to the main control chip (41); The main control chip (41) is bidirectionally connected to the pressure processing module (51) and the signal processing module (52), respectively; the output end of the main control chip (41) is connected to the GSM short message module (61), the buzzer module (71) and the BCM module (81), respectively; The pressure processing module (51) receives the pressure signal transmitted by the main control chip (41) and determines whether the corresponding door handle is pulled up. The main control chip (41) obtains the signal code of pulling up the four door handles and transmits it to the signal processing module (52); The signal processing module (52) stores the signal codes of pulling up the four door handles. If the signal code obtained by the main control chip (41) is consistent with the signal code in the signal processing module (52), the buzzer module (71) is controlled to sound, the GSM text message module (61) sends a text message to the owner's mobile phone, the BCM module (81) is unlocked, and the unlocker knows the vehicle unlocking sequence. The characteristics are: Step 1): Press the capacitive touch button and the pressure sensor on the left front door handle, and the button signal and the pressure signal are simultaneously transmitted to the main control chip (41) via the Bluetooth transmitter module. The main control chip (41) transmits the pressure signal to the pressure processing module (51). If the main control chip (41) receives the signal transmitted by the Bluetooth transmitter module on the right front door, the left rear door or the right door handle, the main control chip (41) does not work; Step 2): The pressure processing module (51) compares the received pressure with the stored set pressure range. If the received pressure is within the pressure range, the judgment result that the door handle is pulled up is sent back to the main control chip (41). The main control chip (41) controls the buzzer module (71) to sound twice. Step 3): The unlocking person pulls up the corresponding door handle in sequence according to the unlocking sequence, and the main control chip (41) transmits the four pressure signals to the pressure processing module (51) in sequence. The pressure processing module (51) determines whether the range of the four pressures is within the set pressure range. If so, the main control chip (41) transmits the signal code of the sequence corresponding to pulling up the door to the signal processing module (52); Step 4): The signal processing module (52) compares the signal code sent by the main control chip (41) with the stored signal code. If the two are consistent, the BCM module (81) is unlocked. Otherwise, the main control chip (41) does not work.

2. A method for unlocking a car door without a key, wherein each door handle is provided with a door handle module, each door handle module includes a Bluetooth transmitter module and a pressure sensor, and the left front door handle module and the right front door handle module are each provided with a capacitive touch button, and the pressure sensor and the capacitive touch button on the same door handle transmit pressure and key signals to the Bluetooth transmitter module; all Bluetooth transmitter modules wirelessly transmit the received pressure and key signals to a main control chip (41); the main control chip (41) is bidirectionally connected to a pressure processing module (51) and a signal processing module (52), and the output end of the main control chip (41) is respectively connected to a GSM short message module (61), a cellular phone module (62), and a control module (63). A buzzer module (71) and a BCM module (81); the pressure processing module (51) receives the pressure signal transmitted by the main control chip (41) to determine whether the corresponding door handle is pulled up, the main control chip (41) obtains the signal code of pulling up the four door handles and transmits it to the signal processing module (52); the signal processing module (52) stores the signal code of pulling up the four door handles, if the signal code obtained by the main control chip (41) is consistent with the signal code in the signal processing module (52), then the buzzer module (71) is controlled to sound, the GSM text message module (61) sends a text message to the owner's mobile phone, and the BCM module (81) is unlocked, and the unlocking person is unaware of the vehicle unlocking sequence, wherein: Step 1): Press the capacitive touch button and the pressure sensor on the left front door handle, and the button signal and the pressure signal are simultaneously transmitted to the main control chip (41) via the Bluetooth transmitter module. If the main control chip (41) receives the signal transmitted by the Bluetooth transmitter module on the right front door, the left rear door or the right door handle, the main control chip (41) does not work; Step 2): the main control chip (41) transmits the pressure signal to the pressure processing module (51), the pressure processing module (51) compares the received pressure with the stored set pressure range, and if the received pressure is within the pressure range, the judgment result that the door handle is pulled up is sent back to the main control chip (41), and the main control chip (41) controls the buzzer module (71) to sound twice; Step 3): Pull up the four door handles at the same time, the main control chip (41) transmits the four pressure signals to the pressure processing module (51) at the same time, and the pressure processing module (51) determines whether the range of the four pressures is within the set pressure range. If so, the main control chip (41) transmits the four door pull-up signal codes to the signal processing module (52) at the same time; Step 4): The signal processing module 52 compares the received signal code with the stored signal code. If the two are consistent, the BCM module (81) is unlocked, otherwise, the main control chip (41) does not work.

3. The unlocking method according to claim 1 or 2, characterized in that: In step 2), the main control chip (41) controls the buzzer module (71) to sound twice only after receiving the signal that the door handle is pulled up and the duration of the capacitive touch button signal reaches 5 seconds.

4. The unlocking method according to claim 3, characterized in that: If the time interval between the buzzer module (71) beeping twice and the main control chip (41) receiving the signal code exceeds 20 seconds, the main control chip (41) does not work.

5. The unlocking method according to claim 1 or 2, characterized in that: After unlocking, the main control chip (41) controls the buzzer to beep twice to remind that the unlocking is successful, and the GSM text message module (61) sends a text message "unlocking successful" to the car owner's mobile phone; conversely, the buzzer beeps once to remind that the unlocking fails, and the GSM text message module (61) sends a text message "unlocking failed" to the car owner's mobile phone.

6. The unlocking method according to claim 1 or 2, characterized in that: The signal processing module (52) stores two signal codes, namely, a code for the sequence of pulling up the four doors and a code for pulling up the four doors simultaneously.

7. The unlocking method according to claim 2, characterized in that: At least two people are needed to pull up all four door handles, apply pressure to four pressure sensors and press two capacitive touch buttons at the same time.

8. The unlocking method according to claim 1 or 2, characterized in that: The pressure sensor is arranged at the middle position of the inner side of the handle, the Bluetooth transmitter module (31) is arranged at the position of the handle towards the front of the vehicle, and the capacitive touch button is arranged at the position of the handle towards the rear of the vehicle.

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