Automobile door automatic release system and method based on keyless entry system

Abstract

The invention discloses an automobile door automatic release system and method based on a keyless entry system, and belongs to the technical field of automobiles. The method comprises the steps that after it is judged that an intelligent key enters an intelligent key induction area through a keyless entry and start (PEPS) system, the intelligent key is released; if the judgment result fed back to the keyless entry and start (PEPS) system by the vehicle door control module (DCM) is that the vehicle lock state of the whole vehicle is an unlocking state, the keyless entry and start (PEPS) system detects and determines the position of the intelligent key and judges whether the intelligent key enters a preset area or not; if yes, the PEPS system starts timing and judges whether the intelligent key leaves the preset area or not before timing is finished, and if not, the PEPS system controls a car door control module (DCM) to execute car door electric release. The automobile door can be automatically released by judging the position of the intelligent key.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and in particular relates to an automatic door release system and method for an automobile based on a keyless entry system. Background Art

[0002] Due to the market demand for intelligent vehicles, the popularity of Passive Entry Passive Start (PEPS) system technology is increasing. The PEPS system brings great convenience to users. The traditional PEPS system can automatically unlock and lock the vehicle by locating the real-time position of the smart key and detecting the user nearby, but it cannot automatically release the car door. After the vehicle is unlocked, the user needs to manually pull the car door handle to open the door and enter the vehicle.

[0003] Patent CN112009422B discloses an antenna system, a key search method, and the PEPS system and vehicle of a PEPS system. The antenna system includes: a first low-frequency antenna arranged in the middle position inside the vehicle; a second low-frequency antenna and a third low-frequency antenna arranged on the driver's side and the co-driver's side outside the vehicle, respectively; and a fourth low-frequency antenna arranged at the trunk position inside the vehicle; wherein the first low-frequency antenna, the second low-frequency antenna, the third low-frequency antenna, and the fourth low-frequency antenna are configured to generate a field strength carrier for searching for keys; wherein the relative positions between the first low-frequency antenna, the second low-frequency antenna, the third low-frequency antenna, and the fourth low-frequency antenna are configured to enable the antenna system to generate a field strength carrier that can cover the entire interior of the vehicle; wherein the fourth low-frequency antenna is configured to generate a field strength carrier that covers the outer area of ​​the trunk of the vehicle.

[0004] However, the technology disclosed in the above patent cannot automatically release the car door by determining the position of the smart key. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a car door automatic release system and method based on a keyless entry system in view of the deficiencies in the prior art, so as to achieve the purpose of automatically releasing the car door by determining the position of the smart key.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The invention provides an automobile door automatic release system based on a keyless entry system, comprising a keyless entry and start (PEPS) system, a door control module (DCM), a smart key, a low-frequency antenna module, an electric release motor and a door lock motor; the keyless entry and start (PEPS) system is respectively connected to the door control module (DCM) and the low-frequency antenna module; the output end of the door control module (DCM) is respectively connected to the input end of the electric release motor and the input end of the door lock motor.

[0008] Furthermore, the smart key interacts with the low-frequency antenna module via wireless signals.

[0009] Further, the Passive Entry and Start (PEPS) system detects and determines the position of the smart key, and determines whether the smart key has entered the smart key sensing area.

[0010] Furthermore, if the keyless entry and start (PEPS) system determines that the smart key has entered the smart key sensing area, the door control module (DCM) determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system.

[0011] Further, if the judgment result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is unlocked, the keyless entry and start (PEPS) system detects and determines the position of the smart key and determines whether the smart key has entered a predetermined area.

[0012] Further, if the Passive Entry and Start (PEPS) system determines that the smart key has entered a predetermined area, the Passive Entry and Start (PEPS) system starts timing and determines whether the smart key has left the predetermined area before the timing ends.

[0013] Furthermore, if the Passive Entry and Start (PEPS) system determines that the smart key has not left the predetermined area before the timing ends, the Passive Entry and Start (PEPS) system controls the Door Control Module (DCM) to perform an electric door release, and the Door Control Module (DCM) controls the electric release motor to perform a door release and opening action.

[0014] Further, the predetermined area includes a right front door edge area, a right rear door edge area, a left front door edge area, and a left rear door edge area.

[0015] Furthermore, if the judgment result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock status is not unlocked, the keyless entry and start (PEPS) system detects and determines the location of the smart key and waits for the vehicle locks to be unlocked. While waiting for the vehicle locks to be unlocked, if the keyless entry and start (PEPS) system determines that the smart key has been in the smart key sensing area for longer than a preset time, the keyless entry and start (PEPS) system turns off the function of detecting and determining the location of the smart key.

[0016] The present invention also provides a method applicable to a vehicle door automatic release system based on a keyless entry system, the method comprising the following steps:

[0017] S1: The Passive Entry and Start (PEPS) system detects and determines the location of the smart key;

[0018] S2: The keyless entry and start (PEPS) system determines whether the smart key has entered the smart key sensing area. If so, it enters S3; if not, it enters S1;

[0019] S3: wake up the network;

[0020] S4: The door control module (DCM) determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system. If the determination result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is unlocked, then enter S5; if the determination result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is not unlocked, then enter S8;

[0021] S5: The Passive Entry and Start (PEPS) system detects and determines the position of the smart key and determines whether the smart key has entered a predetermined area. If so, the system proceeds to S6; if not, the system proceeds to S5;

[0022] S6: The Passive Entry and Start (PEPS) system starts timing and determines whether the smart key leaves the predetermined area before the timing ends. If so, the system proceeds to S5; if not, the system proceeds to S7;

[0023] S7: The Passive Entry and Start (PEPS) system controls the Door Control Module (DCM) to perform electric door release;

[0024] S8: The keyless entry and start (PEPS) system detects and determines the position of the smart key and waits for the vehicle lock to be unlocked. If the keyless entry and start (PEPS) system determines that the smart key has left the smart key sensing area, it enters S1. If the keyless entry and start (PEPS) system receives information about the unlocked state of the vehicle lock fed back by the door control module (DCM), it enters S5. If the keyless entry and start (PEPS) system determines that the time the smart key has been in the smart key sensing area is greater than the preset time, it enters S9.

[0025] S9: The Passive Entry and Start (PEPS) system turns off the function that detects and determines the location of the smart key.

[0026] The automobile door automatic release system and method based on the keyless entry system of the present invention have the following advantages:

[0027] (1) The automobile door automatic release system and method based on the keyless entry system of the present invention can automatically release the automobile door by determining the position of the smart key.

[0028] (2) While automatically releasing the car door through the car door automatic release system and method based on the keyless entry system of the present invention, it also improves the convenience, comfort and practicality of the user when actually using the car, thereby improving the user experience.

[0029] (3) The present invention can better determine the location of the smart key.

[0030] (4) In the present invention, when the time that the smart key is in the smart key sensing area is greater than the preset time, the system of the present invention will turn off the function of detecting and determining the location of the smart key, and the entire vehicle network will be dormant, which can reduce vehicle energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] This specification includes the following drawings, which show the following contents:

[0032] Figure 1 It is a logical structure block diagram of a car door automatic release system based on a keyless entry system of the present invention;

[0033] Figure 2 is a flow chart of a method applicable to an automatic door release system of an automobile based on a keyless entry system of the present invention;

[0034] Figure 3 It is a schematic diagram of the definition of the area where the keyless entry and start (PEPS) system in the present invention detects and determines the location of the smart key.

[0035] Explanation of the reference numerals: 1. Passive entry and start (PEPS) system; 2. Door control module (DCM); 3. Smart key; 4. Low-frequency antenna module; 5. Electric release motor; 6. Door lock motor. DETAILED DESCRIPTION

[0036] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0037] Figure 1 It is a logical structure block diagram of a car door automatic release system based on a keyless entry system of the present invention, including a keyless entry and start (PEPS) system 1, a door control module (DCM) 2, a smart key 3, a low-frequency antenna module 4, an electric release motor 5 and a door lock motor 6; the keyless entry and start (PEPS) system 1 is connected to the door control module (DCM) 2 and the low-frequency antenna module 3 respectively; the output end of the door control module (DCM) 2 is connected to the input end of the electric release motor 5 and the input end of the door lock motor 6 respectively. Among them, the smart key 3 and the low-frequency antenna module 2 interact through wireless signals. In addition, in this specific embodiment, the low-frequency antenna module 4 includes a left door low-frequency antenna, a right door low-frequency antenna, a front row low-frequency antenna, and a rear bumper low-frequency antenna. The left door low-frequency antenna can be arranged inside the left door guard plate of the car, the right door low-frequency antenna can be arranged inside the right door guard plate of the car, the front row low-frequency antenna can be arranged in the front row of the car, such as under the cup holder, and the rear bumper antenna can be arranged on the rear bumper outside the car.

[0038] Figure 2 The present invention is a flow chart of a method for an automatic door release system for a vehicle based on a keyless entry system, the method comprising the following steps:

[0039] S1: The keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, that is, the corresponding Figure 2 S1 in. Specifically, by arranging the low-frequency antenna module 4 and calibrating the field strength value range of each antenna in the low-frequency antenna module 4 at different positions of the smart key 3, the keyless entry and start (PEPS) system 1 determines the area where the smart key 3 is located through the field strength value fed back by each antenna in the low-frequency antenna module 4. More specifically, the keyless entry and start (PEPS) system 1 sends a 125KHZ electrical signal to the low-frequency antenna module 4 according to a predetermined data protocol, and the low-frequency antenna module 4 converts the electrical signal into a wireless signal. After the smart key 3 detects the wireless signal, it feeds back the corresponding high-frequency signal (434MHZ) in real time. The keyless entry and start (PEPS) system 1 determines the location of the smart key 3 through the high-frequency signal fed back by the received smart key 3.

[0040] S2: The keyless entry and start (PEPS) system 1 determines whether the smart key 3 has entered the smart key 3 sensing area. If so, it enters S3. If not, it enters S1, which corresponds to Figure 2 S2 in.

[0041] S3: wake up the network, corresponding to Figure 2 Specifically, when the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the sensing area of ​​the smart key 3, the controller area network (CAN) between the keyless entry and start (PEPS) system 1 and the door control module (DCM) 2 will be awakened.

[0042] S4: The door control module (DCM) 2 determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system 1. If the determination result fed back by the door control module (DCM) 2 to the keyless entry and start (PEPS) system 1 is that the vehicle lock state is unlocked, then enter S5. If the determination result fed back by the door control module (DCM) 2 to the keyless entry and start (PEPS) system 1 is that the vehicle lock state is not unlocked, then enter S8, which corresponds to Figure 2 Specifically, if after the smart key 3 enters the smart key 3 sensing area, the keyless entry and start (PEPS) system 1 determines that the smart key 3 enters the vehicle unlocking area, the keyless entry and start (PEPS) system 1 sends a command to control the door lock unlocking to the door control module (DCM) 2, and the door control module (DCM) 2 further sends the door lock unlocking command to the door lock motor 6. After receiving the door lock unlocking command sent by the door control module (DCM) 2, the door lock motor 6 performs the door lock unlocking action, and the door control module (DCM) 2 feeds back the information that the door lock is in the unlocked state to the keyless entry and start ( If the keyless entry and start (PEPS) system 1 does not determine that the smart key 3 has entered the whole vehicle unlocking area after the smart key 3 has entered the smart key 3 sensing area, the keyless entry and start (PEPS) system 1 does not send a command to control the door lock unlocking to the door control module (DCM) 2, the door control module (DCM) 2 does not send a door lock unlocking command to the door lock motor 6, the door lock motor 6 does not perform the door lock unlocking action, and the door control module (DCM) 2 feeds back information that the door lock is not in the unlocked state to the keyless entry and start (PEPS) system 1, and enters S8.

[0043] S5: The keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3 and determines whether the smart key 3 has entered the predetermined area. If so, it enters S6; if not, it enters S5, that is, the corresponding Figure 2 Specifically, if the door control module (DCM) 2 feeds back information that the door lock is in the unlocked state to the keyless entry and start (PEPS) system 1, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3 and determines whether the smart key 3 has entered the predetermined area. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the predetermined area, it enters S6. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not entered the predetermined area, it enters S5.

[0044] S6: The keyless entry and start (PEPS) system 1 starts timing and determines whether the smart key 3 leaves the predetermined area before the timing ends. If so, it enters S5; if not, it enters S7, which corresponds to Figure 2 Specifically, if the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the predetermined area, the keyless entry and start (PEPS) system 1 starts timing and determines whether the smart key 3 has left the predetermined area before the timing ends. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has left the predetermined area before the timing ends, the process enters S5. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not left the predetermined area before the timing ends, the process enters S7.

[0045] S7: The keyless entry and start (PEPS) system 1 controls the door control module (DCM) 2 to perform the door electric release, which corresponds to Figure 2 Specifically, if the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not left the predetermined area before the timing ends, the keyless entry and start (PEPS) system 1 sends a command to control the electric release and opening of the door to the door control module (DCM) 2, and the door control module (DCM) 21 further sends the electric release and opening command to the electric release motor 5, and the electric release motor 5 performs the door release and opening action after receiving the electric release and opening command sent by the door control module (DCM) 2.

[0046] S8: The keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and waits for the vehicle lock to be unlocked. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has left the smart key 3 sensing area, it enters S1. If the keyless entry and start (PEPS) system 1 receives the information of the vehicle lock unlocking state feedback from the door control module (DCM) 2, it enters S5. If the keyless entry and start (PEPS) system 1 determines that the time when the smart key 3 is in the smart key 3 sensing area is greater than the preset time, it enters S9, which corresponds to Figure 2S8 in the process. Specifically, if the door control module (DCM) 2 feeds back information that the door lock is not in the unlocked state to the keyless entry and start (PEPS) system 1, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and waits for the whole vehicle lock to be unlocked. While waiting for the whole vehicle lock to be unlocked, if the keyless entry and start (PEPS) system 1 determines that the smart key 3 has left the smart key 3 sensing area, it enters S1. If the keyless entry and start (PEPS) system 1 receives the information that the whole vehicle lock is unlocked fed back by the door control module (DCM) 2, it enters S5. If the keyless entry and start (PEPS) system 1 determines that the time that the smart key 3 is in the smart key 3 sensing area is greater than the preset time, it enters S9.

[0047] S9: The keyless entry and start (PEPS) system 1 turns off the function of detecting and determining the position of the smart key 3, that is, the corresponding Figure 2 S9 in the figure. Specifically, if the keyless entry and start (PEPS) system 1 determines that the time that the smart key 3 is in the sensing area of ​​the smart key 3 is greater than the preset time, the keyless entry and start (PEPS) system 1 turns off the function of detecting and determining the position of the smart key 3. The preset time is 3 minutes, but the preset time is not limited to 3 minutes and can be adjusted according to specific circumstances. In addition, if the keyless entry and start (PEPS) system 1 detects and determines that the position of the smart key 3 is outside the sensing area of ​​the smart key 3, the automatic door opening function is immediately turned off, and the door lock state or door state change reactivates the above process.

[0048] Figure 3 It is a schematic diagram of the definition of the area where the keyless entry and start (PEPS) system 1 detects and determines the location of the smart key 3 in the present invention, Figure 3 The areas defined in include the area outside the sensing area of ​​the smart key 3, the sensing area of ​​the smart key 3, the vehicle unlocking area, the right front door edge area, the right rear door edge area, the left front door edge area, the left rear door edge area, the trunk area, and the vehicle interior area. According to the above area definitions, the field strength value range of each antenna in the low-frequency antenna module 4 of the smart key 3 at different positions is calibrated, and the reference range of the field strength value provided is as follows:

[0049] For the interior area:

[0050] The field strength threshold inside and outside the front low-frequency antenna is set to A1, the field strength threshold inside and outside the left door low-frequency antenna is set to B1, and the field strength threshold inside and outside the right door low-frequency antenna is set to C1. The judgment threshold of the area inside the car can be set to: RSSI1>A1, RSSI2>B1, and RSSI3>C1.

[0051] For the left front door edge area:

[0052] Set the field strength threshold near the left front door of the front low-frequency antenna to A2, set the field strength threshold near the left front door of the left door low-frequency antenna to B2, set the field strength threshold near the left front door of the right door low-frequency antenna to C2, and set the field strength threshold near the left front door of the rear low-frequency antenna to D2. The judgment threshold of the edge area of ​​the left front door can be set to: RSSI1>A2 and RSSI2>B2 and RSSI4<D2 and RSSI2>RSSI3 and not in the vehicle interior area.

[0053] For the left rear door edge area:

[0054] Set the field strength threshold near the left rear door of the front low-frequency antenna to A3, set the field strength threshold near the left rear door of the left door low-frequency antenna to B3, set the field strength threshold near the left rear door of the right door low-frequency antenna to C3, and set the field strength threshold near the left rear door of the rear low-frequency antenna to D3. Then the judgment threshold of the edge area of ​​the left rear door can be set to: RSSI1<A3 and RSSI2>B3 and RSSI4>D3 and RSSI2>RSSI3 and not in the car area.

[0055] For the trunk area:

[0056] Set the field strength threshold near the back door of the front low-frequency antenna to A4, set the field strength threshold near the back door of the left door low-frequency antenna to B4, set the field strength threshold near the back door of the right door low-frequency antenna to C4, and set the field strength threshold near the back door of the rear low-frequency antenna to D4. The judgment threshold of the trunk area can be set to: RSSI2<B4 and RSSI3<C4 and RSSI4>D4 and not in the vehicle area.

[0057] For the right front door edge area:

[0058] Set the field strength threshold near the right front door of the front low-frequency antenna to A5, set the field strength threshold near the right front door of the left door low-frequency antenna to B5, set the field strength threshold near the right front door of the right door low-frequency antenna to C5, and set the field strength threshold near the right front door of the rear low-frequency antenna to D5. Then the judgment threshold of the edge area of ​​the right front door can be set to: RSSI1>A5 and RSSI3>C5 and RSSI4<D5 and RSSI2<RSSI3 and not in the car area.

[0059] For the right rear door edge area:

[0060] Set the field strength threshold near the right rear door of the front low-frequency antenna to A6, set the field strength threshold near the right rear door of the left door low-frequency antenna to B6, set the field strength threshold near the right rear door of the right door low-frequency antenna to C6, and set the field strength threshold near the right rear door of the rear low-frequency antenna to D6. Then the judgment threshold of the edge area of ​​the right rear door can be set to: RSSI1<A6 and RSSI3>C6 and RSSI4>D6 and RSSI2<RSSI3 and not in the car area.

[0061] Among them, the above RSSI1 represents the field strength of the front low-frequency antenna; RSSI2 represents the field strength of the left door low-frequency antenna; RSSI3 represents the field strength of the right door low-frequency antenna; RSSI4 represents the field strength of the rear low-frequency antenna.

[0062] In addition, in this specific embodiment, the value of A1 can be set to 18000 microvolts; the value of B1 can be set to 23000 microvolts; the value of C1 can be set to 23000 microvolts; the value of A2 can be set to 3000 microvolts; the value of B2 can be set to 5000 microvolts; the value of D2 can be set to 2000 microvolts; the value of A3 can be set to 3000 microvolts; the value of B3 can be set to 8000 microvolts; the value of D3 can be set to 2000 microvolts; the value of B4 can be set to 5000 microvolts; the value of C4 can be set to 5000 microvolts; the value of D4 can be set to 5000 microvolts; the value of A5 can be set to 3000 microvolts; the value of C5 can be set to 5000 microvolts; the value of D5 can be set to 2000 microvolts; the value of A6 can be set to 3000 microvolts; the value of C6 can be set to 8000 microvolts; the value of D6 can be set to 2000 microvolts.

[0063] Combine the following Figure 1 to Figure 3 The working principle of the system of the present invention is introduced as follows:

[0064] The keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and determines whether the smart key 3 has entered the sensing area of ​​the smart key 3. Specifically, by arranging the low-frequency antenna module 4, calibrating the field strength value range of each antenna in the low-frequency antenna module 4 at different positions of the smart key 3, the keyless entry and start (PEPS) system 1 determines the area where the smart key 3 is located through the field strength value fed back by each antenna in the low-frequency antenna module 4. More specifically, the keyless entry and start (PEPS) system 1 sends a 125KHZ electrical signal to the low-frequency antenna module 4 according to a predetermined data protocol, and the low-frequency antenna module 4 converts the electrical signal into a wireless signal. After the smart key 3 detects the wireless signal, it feeds back the corresponding high-frequency signal (434MHZ) in real time. The keyless entry and start (PEPS) system 1 determines the position of the smart key 3 through the high-frequency signal fed back by the received smart key 3. That is, the position of the smart key can be better determined by the present invention. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the smart key 3 sensing area, the door control module (DCM) 2 determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system 1. Specifically, if after the smart key 3 has entered the smart key 3 sensing area, the keyless entry and start (PEPS) system 1 also determines that the smart key 3 has entered the vehicle unlocking area, the keyless entry and start (PEPS) system 1 sends a command to control the door lock unlocking to the door control module (DCM) 2, and the door control module (DCM) 2 further sends a door lock unlocking command to the door lock motor 6. After receiving the door lock unlocking command sent by the door control module (DCM) 2, the door lock motor 6 executes the door lock unlocking action, and the door control module (DCM) 2 feeds back the information that the door lock is in the unlocked state to the keyless entry and start (PEPS) system 1. entry and start (PEPS) system 1; if after the smart key 3 enters the smart key 3 sensing area, the keyless entry and start (PEPS) system 1 does not determine that the smart key 3 has entered the vehicle unlocking area, the keyless entry and start (PEPS) system 1 does not send a command to control the door lock unlocking to the door control module (DCM) 2, the door control module (DCM) 2 does not send a door lock unlocking command to the door lock motor 6, the door lock motor 6 does not perform the door lock unlocking action, and the door control module (DCM) 2 feeds back information that the door lock is not in the unlocked state to the keyless entry and start (PEPS) system 1.

[0065] If the result of the judgment fed back by the door control module (DCM) 2 to the keyless entry and start (PEPS) system 1 is that the vehicle lock state is unlocked, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3 and determines whether the smart key 3 has entered the predetermined area. Specifically, if the door control module (DCM) 2 feeds back information that the door lock is unlocked to the keyless entry and start (PEPS) system 1, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3 and determines whether the smart key 3 has entered the predetermined area. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the predetermined area, the keyless entry and start (PEPS) system 1 starts timing and determines whether the smart key 3 has left the predetermined area before the timing ends, wherein the timing duration is 3 seconds, but the timing duration is not limited to 3 seconds, but can be set according to specific circumstances. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not left the predetermined area before the timing ends, the keyless entry and start (PEPS) system 1 controls the vehicle door control module (DCM) 2 to perform the door electric release, and the vehicle door control module (DCM) 2 controls the electric release motor 5 to perform the door release and opening action. Specifically, if the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not left the predetermined area before the timing ends, the keyless entry and start (PEPS) system 1 sends a command to control the corresponding door electric release and opening to the vehicle door control module (DCM) 2, and the vehicle door control module (DCM) 21 further sends the door electric release and opening command to the electric release motor 5, and the electric release motor 5 performs the door release and opening action after receiving the door electric release and opening command sent by the vehicle door control module (DCM) 2, and the corresponding door slowly pops open. That is, the present invention can automatically release the car door by determining the position of the smart key 3 , which not only improves the convenience, comfort and practicality of the user in actual use of the car, but also enhances the user experience.

[0066] If the result of the judgment fed back by the door control module (DCM) 2 to the keyless entry and start (PEPS) system 1 is that the vehicle lock state is not unlocked, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and waits for the vehicle lock to be unlocked. Specifically, if the door control module (DCM) 2 feeds back information that the door lock is not unlocked to the keyless entry and start (PEPS) system 1, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and waits for the vehicle lock to be unlocked. While waiting for the vehicle lock to be unlocked, if the keyless entry and start (PEPS) system 1 determines that the time that the smart key 3 is in the sensing area of ​​the smart key 3 is greater than the preset time, the keyless entry and start (PEPS) system 1 turns off the function of detecting and determining the position of the smart key 3, wherein the preset time is 3 minutes, but the preset time is not limited to 3 minutes, but can be adjusted according to specific circumstances. That is, the present invention can shut down the function of detecting and determining the position of the smart key 3 when the time when the smart key 3 is in the sensing area of ​​the smart key 3 is greater than a preset time, and the entire vehicle network is dormant, thereby reducing vehicle energy consumption.

[0067] The aforementioned predetermined area includes a right front door edge area, a right rear door edge area, a left front door edge area, and a left rear door edge area.

[0068] In addition, the automobile door automatic release system based on the keyless entry system of the present invention can be turned on or off according to the needs of the user, and is independent of the welcome function of the keyless entry system.

[0069] Functions and Effects of the Embodiments

[0070] By arranging the low-frequency antenna module 4 and calibrating the field strength value range of each antenna in the low-frequency antenna module 4 at different positions of the smart key 3, the keyless entry and start (PEPS) system 1 determines the area where the smart key 3 is located through the field strength values ​​fed back by each antenna in the low-frequency antenna module 4. The keyless entry and start (PEPS) system 1 sends a 125KHZ electrical signal to the low-frequency antenna module 4 according to a predetermined data protocol, and the low-frequency antenna module 4 converts the electrical signal into a wireless signal. After the smart key 3 detects the wireless signal, it feeds back the corresponding high-frequency signal (434MHZ) in real time. The keyless entry and start (PEPS) system 1 determines the position of the smart key 3 through the high-frequency signal fed back by the received smart key 3. That is, the position of the smart key can be better judged through the present invention.

[0071] If after the smart key 3 enters the smart key 3 sensing area, the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the whole vehicle unlocking area, the keyless entry and start (PEPS) system 1 sends a command to control the door lock unlocking to the door control module (DCM) 2, and the door control module (DCM) 2 further sends the door lock unlocking command to the door lock motor 6. After receiving the door lock unlocking command sent by the door control module (DCM) 2, the door lock motor 6 executes the door lock unlocking action, and the door control module (DCM) 2 feeds back information that the door lock is in the unlocked state to the keyless entry and start (PEPS) system 1, and the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3 and determines whether the smart key 3 has entered the predetermined area. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has entered the predetermined area, the keyless entry and start (PEPS) system 1 starts timing and determines whether the smart key 3 has left the predetermined area before the timing ends, wherein the timing duration is 3 seconds, but the timing duration is not limited to 3 seconds, but can be specifically set according to specific circumstances. If the keyless entry and start (PEPS) system 1 determines that the smart key 3 has not left the predetermined area before the timing ends, the keyless entry and start (PEPS) system 1 sends a command to control the electric release and opening of the corresponding door to the door control module (DCM) 2, and the door control module (DCM) 21 then sends the door electric release and opening command to the electric release motor 5, and the electric release motor 5 performs the release and opening action of the corresponding door after receiving the door electric release and opening command sent by the door control module (DCM) 2, and the corresponding door slowly pops open. That is, the present invention can realize the automatic release of the car door by determining the position of the smart key 3, and while realizing the automatic release of the car door, it also improves the convenience, comfort and practicality of the user in actual use of the car, and improves the user experience.

[0072] If the door control module (DCM) 2 feeds back the information that the door lock is not in the unlocked state to the keyless entry and start (PEPS) system 1, the keyless entry and start (PEPS) system 1 detects and determines the position of the smart key 3, and waits for the whole vehicle lock to be unlocked. While waiting for the whole vehicle lock to be unlocked, if the keyless entry and start (PEPS) system 1 determines that the time that the smart key 3 is in the sensing area of ​​the smart key 3 is greater than the preset time, the keyless entry and start (PEPS) system 1 turns off the function of detecting and determining the position of the smart key 3, wherein the preset time is 3 minutes, but the preset time is not limited to 3 minutes, but can be adjusted according to the specific situation. That is, the present invention can turn off the function of detecting and determining the position of the smart key 3 when the time that the smart key 3 is in the sensing area of ​​the smart key 3 is greater than the preset time, and the whole vehicle network is dormant, which can reduce the energy consumption of the vehicle.

[0073] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An automatic door release system for a car based on a keyless entry system, characterized in that: It includes a keyless entry and start (PEPS) system, a door control module (DCM), a smart key, a low-frequency antenna module, an electric release motor and a door lock motor; the keyless entry and start (PEPS) system is connected to the door control module (DCM) and the low-frequency antenna module respectively; the output end of the door control module (DCM) is connected to the input end of the electric release motor and the input end of the door lock motor respectively.

2. The automatic door release system for a car based on a keyless entry system as claimed in claim 1, characterized in that: The smart key interacts with the low-frequency antenna module via wireless signals.

3. The automatic door release system for a car based on a keyless entry system as claimed in claim 2, characterized in that: The Passive Entry and Start (PEPS) system detects and determines the position of the smart key and determines whether the smart key has entered a smart key sensing area.

4. The automatic door release system for a car based on a keyless entry system as claimed in claim 3, characterized in that: If the keyless entry and start (PEPS) system determines that the smart key has entered the smart key sensing area, the door control module (DCM) determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system.

5. The automatic door release system for a car based on a keyless entry system as claimed in claim 4, characterized in that: If the judgment result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is unlocked, the keyless entry and start (PEPS) system detects and determines the position of the smart key and determines whether the smart key has entered a predetermined area.

6. The automatic door release system for a car based on a keyless entry system as claimed in claim 5, characterized in that: If the Passive Entry and Start (PEPS) system determines that the smart key has entered a predetermined area, the Passive Entry and Start (PEPS) system starts timing and determines whether the smart key has left the predetermined area before the timing ends.

7. The automatic door release system for a car based on a keyless entry system as claimed in claim 6, characterized in that: If the PEPS system determines that the smart key has not left the predetermined area before the timing ends, the PEPS system controls the DCM to perform an electric door release, and the DCM controls the electric release motor to perform a door release and opening action.

8. The automatic door release system for automobiles based on a keyless entry system according to any one of claims 5 to 7, characterized in that: The predetermined area includes a right front door edge area, a right rear door edge area, a left front door edge area, and a left rear door edge area.

9. The automatic door release system for a car based on a keyless entry system as claimed in claim 4, characterized in that: If the judgment result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is not unlocked, the keyless entry and start (PEPS) system detects and determines the position of the smart key and waits for the vehicle lock to be unlocked. While waiting for the vehicle lock to be unlocked, if the keyless entry and start (PEPS) system determines that the time the smart key is in the smart key sensing area is greater than a preset time, the keyless entry and start (PEPS) system turns off the function of detecting and determining the position of the smart key.

10. A method for an automatic door release system for a vehicle based on a keyless entry system according to any one of claims 1 to 9, characterized in that: The method comprises the following steps: S1: The Passive Entry and Start (PEPS) system detects and determines the location of the smart key; S2: The keyless entry and start (PEPS) system determines whether the smart key has entered the smart key sensing area. If so, it enters S3; if not, it enters S1; S3: wake up the network; S4: The door control module (DCM) determines whether the vehicle lock state is unlocked and feeds back the determination result to the keyless entry and start (PEPS) system. If the determination result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is unlocked, then enter S5; if the determination result fed back by the door control module (DCM) to the keyless entry and start (PEPS) system is that the vehicle lock state is not unlocked, then enter S8; S5: The Passive Entry and Start (PEPS) system detects and determines the position of the smart key and determines whether the smart key has entered a predetermined area. If so, the system proceeds to S6; if not, the system proceeds to S5; S6: The Passive Entry and Start (PEPS) system starts timing and determines whether the smart key leaves the predetermined area before the timing ends. If so, the system proceeds to S5; if not, the system proceeds to S7; S7: The Passive Entry and Start (PEPS) system controls the Door Control Module (DCM) to perform electric door release; S8: The keyless entry and start (PEPS) system detects and determines the position of the smart key and waits for the vehicle lock to be unlocked. If the keyless entry and start (PEPS) system determines that the smart key has left the smart key sensing area, it enters S1. If the keyless entry and start (PEPS) system receives information about the unlocked state of the vehicle lock fed back by the door control module (DCM), it enters S5. If the keyless entry and start (PEPS) system determines that the time the smart key has been in the smart key sensing area is greater than the preset time, it enters S9. S9: The Passive Entry and Start (PEPS) system turns off the function that detects and determines the location of the smart key.

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