CN114299644A - Vehicle access system and vehicle access method - Google Patents
Vehicle access system and vehicle access method Download PDFInfo
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- CN114299644A CN114299644A CN202111666407.4A CN202111666407A CN114299644A CN 114299644 A CN114299644 A CN 114299644A CN 202111666407 A CN202111666407 A CN 202111666407A CN 114299644 A CN114299644 A CN 114299644A
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Abstract
The invention relates to the field of vehicle intelligent control, in particular to a vehicle access system and a vehicle access method. The embodiment of the invention installs a master node module with a master Bluetooth unit on a vehicle, sets at least 3 slave node modules with slave Bluetooth units and first ultra-wideband units around the vehicle, detects the distance between the vehicle and a vehicle key by using the master Bluetooth unit, sends a distance measurement control signal when the distance is less than a preset value, controls the slave Bluetooth unit to detect the broadcast signal intensity of the vehicle key, measures the distance of the vehicle key by the first ultra-wideband units on at least 2 slave node modules with stronger signal intensity, and finally obtains the accurate position information of the vehicle key according to the distance information to control the vehicle lock. Through the system setting and the method, the invention greatly improves the positioning accuracy of the vehicle key by the vehicle entering system while ensuring lower energy consumption, thereby improving the sensitivity and accuracy of unlocking and locking and improving the user experience.
Description
Technical Field
The invention relates to the field of vehicle intelligent control, in particular to a vehicle access system and a vehicle access method.
Background
The development of the technology promotes the iteration of new products, the entering system of the vehicle is changed from an early mechanical key to a remote control system, along with the wide application of the keyless system technology and the diversification and convenience requirements of the automobile market, the replacement of the remote control entering system by the keyless entering system is a trend, and meanwhile, the keyless entering system is mostly adopted in the item level configuration of middle and high-grade cars. When a vehicle owner approaches to the vehicle for a certain distance, the existing wireless access system does not need to take out a key from a bag or a pocket, the vehicle can be unlocked automatically, and an engine anti-theft locking system can be released automatically. When the owner leaves the vehicle, the door lock can be automatically locked and the anti-theft and engine anti-theft locking system is started. However, the existing keyless entry system also has the problems that the intelligent digital key is not accurately positioned, so that the locking and unlocking are not sensitive and accurate enough, and the user experience is influenced.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a vehicle entry system and a vehicle entry method, which can more precisely locate a vehicle key to improve user experience.
In a first aspect, an embodiment of the present invention provides a vehicle access system, including: the master node module is arranged on a vehicle and is in communication connection with a vehicle lock of the vehicle, and the master node module comprises a master Bluetooth unit and is used for wirelessly connecting a vehicle key and controlling the vehicle lock to be switched on and off according to the position of the vehicle key; the system comprises a master node module, at least 3 slave node modules and a control module, wherein the master node module is used for controlling the master node module to communicate with the master node module, the slave node modules are respectively installed around the vehicle and are respectively in communication connection with the master node module, each slave node module comprises a slave Bluetooth unit and a first ultra-wideband unit, and the slave node modules are used for wirelessly connecting the vehicle key and determining the position of the vehicle key; the master node module is configured to detect a distance between the vehicle and a vehicle key through the master Bluetooth unit, send a ranging control signal to each slave node module to control each slave node module to start ranging when the distance is smaller than a preset value, send intensity information of the Bluetooth broadcast signal to the master node module after each slave Bluetooth unit starts ranging, and select to send a second ranging control signal to the slave node modules corresponding to at least 2 slave Bluetooth units with stronger signal intensity according to the intensity information; each slave node module is configured to turn on a slave bluetooth unit in response to receiving the ranging control signal, to detect a bluetooth broadcast signal of the vehicle key, and to transmit intensity information of the bluetooth broadcast signal to the master node module; the slave node module corresponding to the at least 2 slave Bluetooth units is configured to turn on the first ultra-wideband unit in response to receiving the second ranging control signal, measure distance information of the vehicle key from the slave node module, and transmit the distance information to the master node module; the master node module is further configured to determine position information of the vehicle key according to the distance information, and control the vehicle lock according to the position information.
Further, the first ultra-wideband unit is configured to send out an electromagnetic wave signal to the vehicle key, and calculate the distance between the vehicle key and the corresponding slave node module in a time-of-flight method by receiving the time of the signal returned by the vehicle key.
Further, the master node module is configured to obtain the position information of the vehicle key according to the opened at least 2 first ultra-wideband units, send an unlocking signal to the lock when the vehicle key enters a first preset position area, and send a locking signal to the lock when the vehicle key leaves a second preset position area, wherein the radius of the second preset position area from the vehicle is larger than that of the first preset position area from the vehicle.
Further, the master node module is configured to obtain at most two anchor points according to the distance information sent by the slave node modules corresponding to the at least 2 slave bluetooth units, determine a position of the vehicle key according to the strength information of each bluetooth broadcast signal, and determine one of the at most two anchor points as the position of the vehicle key according to the position.
Further, the master node module further includes: the second ultra-wideband unit is used for positioning the vehicle key together with the first ultra-wideband unit; the master node module is configured to send a third ranging control signal to the slave node modules to control all the slave node modules to start ranging when the vehicle key enters a second predetermined location area and start the second ultra-wideband unit to perform ranging.
Further, the master node module further includes: the bus control unit is used for sending control signals to the slave node module and the lock according to the position of the vehicle key; and the slave node module is connected with the master node module through the interface unit.
Further, the vehicle entry system includes 5 slave node modules respectively disposed at the periphery and the top of the vehicle.
In another aspect, an embodiment of the present invention further provides a vehicle entering method, where the method includes the following steps: a main Bluetooth unit on the main node module sends a Bluetooth connection request to a vehicle key; after the master Bluetooth unit is successfully connected with the vehicle key in a Bluetooth mode, detecting the distance between the vehicle and the vehicle key; in response to the distance being less than a predetermined value, sending a ranging control signal to each slave node module to control each slave node module to initiate ranging; each slave node module responds to the received ranging control signal, detects a Bluetooth broadcast signal of the vehicle key through a slave Bluetooth unit, and sends the strength information of the Bluetooth broadcast signal to the master node module; the master node module selects to send a second ranging control signal to the slave node modules corresponding to at least 2 slave Bluetooth units with stronger signal strength according to the strength information; the slave node modules corresponding to the at least 2 slave Bluetooth units respond to the second ranging control signal, measure the distance information between the vehicle key and the slave node module through a first ultra-wideband unit, and send the distance information to the master node module; the master node module determines the position information of the vehicle key according to the distance information; and controlling the vehicle lock according to the position information.
Further, the measuring distance information of the vehicle key and the slave node module by the first ultra-wideband unit comprises: the first ultra-wideband unit sends out an electromagnetic wave signal to the vehicle key; and calculating the distance between the vehicle key and the corresponding slave node module by a time-of-flight method through the time of receiving the signal returned by the vehicle key.
Further, the controlling the vehicle lock according to the position information includes: in response to the vehicle key entering a first predetermined location area, sending an unlock signal to the vehicle lock; in response to the vehicle key leaving a second predetermined location area, sending a lock-off signal to the vehicle lock.
Further, the determining, by the master node module according to the distance information, the location information of the vehicle key includes: the master node module obtains at most two positioning points according to the distance information sent by the slave node modules corresponding to the at least 2 slave Bluetooth units; determining the position of the vehicle key according to the strength information of each Bluetooth broadcast signal; and determining one of the at most two positioning points as the position of the vehicle key according to the position.
Further, the controlling the vehicle lock according to the position information includes: responding to the vehicle key entering a second preset position area, sending a third ranging control signal to the slave node modules to control all the slave node modules to start ranging, and starting a second ultra-wideband unit to perform ranging; the slave node module responds to the third distance measurement control signal, obtains distance information through measurement of the first ultra-wideband unit, sends the distance information to the master node module, and obtains second distance information through measurement of the second ultra-wideband unit; the master node module determines the accurate position information of the vehicle key according to the distance information and the second distance information; and controlling the vehicle lock according to the accurate position information.
Further, the first predetermined location region comprises a plurality of sub-regions; said transmitting an unlock signal to said lock in response to said vehicle key entering a first predetermined location area comprises: and responding to the entry of the vehicle key into the sub-area, and sending an unlocking signal to the lock at the position corresponding to the sub-area.
The vehicle entering system and the vehicle entering method of the embodiment of the invention install a master node module with a master Bluetooth unit on a vehicle, and arrange at least 3 slave node modules with slave Bluetooth units and first ultra-wideband units around the vehicle, use the master Bluetooth unit to detect the distance between the vehicle and a vehicle key, and send a distance measurement control signal when the distance is less than a preset value, control the slave Bluetooth unit to detect the broadcast signal intensity of the vehicle key, then carry out distance measurement on the vehicle key by the first ultra-wideband units on at least 2 slave node modules with stronger signal intensity, and finally obtain the accurate position information of the vehicle key according to the distance information to control the vehicle lock. Through the system setting and the method, the invention greatly improves the positioning accuracy of the vehicle key by the vehicle entering system while ensuring lower energy consumption, thereby improving the sensitivity and accuracy of unlocking and locking and improving the user experience.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a detailed configuration of a vehicle access system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the overall structure and method of operation of a vehicle access system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a vehicle key location of a vehicle entry system according to an embodiment of the present invention;
FIG. 4 is a schematic view of the overall steps of a vehicle entry method of an embodiment of the present invention;
FIG. 5 is a detailed step diagram of step S6 of the vehicle entering method according to the embodiment of the present invention;
FIG. 6 is a detailed step diagram of step S7 of the vehicle entering method according to the embodiment of the present invention;
FIG. 7 is a detailed step diagram of step S8 of the vehicle entering method according to the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating another specific step of step S8 of the vehicle entering method according to the embodiment of the present invention;
fig. 9 is a detailed step diagram of steps S81 and S82 of the vehicle entering method according to the embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details. Well-known methods, procedures, components and circuits have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Meanwhile, it should be understood that, in the following description, a "circuit" refers to a conductive loop constituted by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected to" another element or element/circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Unless the context clearly requires otherwise, throughout the description, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
An embodiment of the present invention provides a vehicle access system, and as shown in fig. 1 and fig. 2, the vehicle access system according to the embodiment of the present invention includes a master node module 1 and a slave node module 2. The master node module 1 is installed in the center of the top of the vehicle and is in communication connection with a vehicle lock of the vehicle, and the master node module 1 comprises a master Bluetooth unit 11 and is used for controlling the vehicle lock to be turned on and off according to the position of a vehicle key. The slave node module 2 at least comprises N1, N2 and N3 which are respectively arranged on the periphery of the vehicle and are respectively connected with the master node module 1 in a communication way, and the slave node module 2 comprises a slave Bluetooth unit 21 and a first ultra-wideband unit 22 which are used for wirelessly connecting the vehicle key and determining the position of the vehicle key. Specifically, the master node module 1 is configured to detect the distance between the vehicle and the vehicle key through the master bluetooth unit 11, and transmit a ranging control signal to each slave node module 2 to control each slave node module 2 to start ranging when the distance is less than a predetermined value r 1. The slave node module 2 is configured to turn on the slave bluetooth unit 21 in response to receiving the ranging control signal, and connect the vehicle key with the slave bluetooth unit 21, detect a bluetooth broadcast signal of the vehicle key, and transmit intensity information of the bluetooth broadcast signal to the master node module 1. The master node module 1 is further configured to select, according to the strength information, to send a second ranging control signal to the slave node module 2 corresponding to at least 2 slave bluetooth units 21 having stronger signal strength. The slave node module 2 corresponding to at least 2 of the slave bluetooth units 21 is configured to turn on the first ultra-wideband unit 22 in response to receiving the second ranging control signal, measure distance information of the vehicle key and the slave node module 2 through the first ultra-wideband unit 22, and transmit the distance information to the master node module 1. The master node module 1 is further configured to determine position information of a vehicle key according to the distance information, and control a vehicle lock according to the position information.
In the embodiment of the present invention, the vehicle key is an electronic key, and may specifically be any electronic product with a digital identity, such as a mobile phone. The connection range and the predetermined distance r1 of the master bluetooth unit 11 are determined by specific conditions, and the bluetooth connection range 50m and r1 of 10m are taken as examples in the present embodiment. When a user carries a vehicle key to move near a vehicle, the master bluetooth unit 11 sends a bluetooth connection signal to the vehicle key, if the distance between the vehicle key and the vehicle is within 50m of the bluetooth connection range, the master node module 1 reads the digital identity information of the vehicle key through the master bluetooth unit 11 to determine whether the vehicle key is matched with the master bluetooth unit, and if the vehicle key is successfully matched with the master bluetooth unit 11, a bluetooth connection is established between the master bluetooth unit 11 and the vehicle key. Then, the master node module 1 obtains the received Signal Strength of the master bluetooth unit 11 by using an rssi (received Signal Strength indication) method, so as to determine the distance between the vehicle key and the vehicle, and when the distance is less than a predetermined value 10m, sends a ranging control Signal to the slave node module 2. In another possible scheme, the master node module 1 may also determine the distance between the vehicle key and the vehicle by presetting the traveling speed of the user, for example, the walking speed of the user is 1m/s, then, after the master bluetooth unit 11 establishes a bluetooth connection with the vehicle key, timing is started, the distance is 50m, the time when the user arrives at the preset value 10 is estimated to be (50-10)/1-40 s, and then, the master node module sends the ranging control signal to each slave node module 2 when the timing arrives at 40 s. After each slave node module 2 receives the ranging control signal, the slave bluetooth unit 21 is started, the slave bluetooth unit 21 establishes bluetooth connection with the vehicle key, then obtains the bluetooth broadcast signal intensity of the vehicle key by an RSSI method, and sends the intensity information of the bluetooth broadcast signal to the master node module 1. Since the position of each slave node module 2 is different and the distance from the vehicle key is different, the intensity of the received bluetooth broadcast signal is different, and after receiving the intensity information, the master node module 1 will send a second ranging control signal to the slave node module 2 where at least 2 slave bluetooth units 21 with the strongest signal intensity are located. After receiving the second ranging control signal, the slave node module 2 in which the at least 2 slave bluetooth units 21 with the strongest signal strength start the first ultra-wideband unit 22, the first ultra-wideband unit 22 sends an electromagnetic wave signal to the vehicle key, and then calculates the precise distance between the vehicle key and the slave node module 2 by using a time of flight (TOF) method through the time of receiving the signal returned by the vehicle key, and sends the precise distance information to the master node module 1. Since the plurality of slave node modules 2 are located at different positions, and the master node module 1 has pre-stored position coordinates of each slave node module 2 in advance, the master node module 1 can calculate the accurate position of the vehicle key according to the accurate distance between the vehicle key and each slave node module 2 and the coordinate position of each slave node module 2. Because the positioning accuracy of ultra wide band technique is higher, consequently this embodiment can improve the degree of accuracy to the vehicle key location by a wide margin through the above-mentioned setting to the sensitivity and the degree of accuracy of unblanking and closing the lock have been improved, user experience has been promoted. Meanwhile, the master bluetooth unit 11 and the slave bluetooth units 21 in this embodiment are bluetooth low energy, and all the first ultra wide band units are not directly started when the vehicle key is measured, but only the ultra wide band units on the slave node module 2 where at least 2 slave bluetooth units 21 with the strongest signal strength are started, so that the positioning accuracy is ensured, the energy consumption of the system is at a lower level, and the problem of excessive power consumption of the system is solved.
In a specific embodiment, the master node module 1 is further configured to obtain at most two anchor points according to the distance information sent by the slave node module 2 corresponding to at least 2 slave bluetooth units 21, determine the position of the vehicle key according to the strength information of each bluetooth broadcast signal, and determine one of the at most two anchor points as the position of the vehicle key according to the position. When only 2 slave node modules 2 start the first ultra-wideband unit 22 to perform ranging, the master node module 1 will obtain two positioning points according to the distance information sent by the 2 slave node modules 2. In order to select the specific position of the vehicle key from the two positioning points, the master node module 1 further needs to determine the position of the vehicle key by combining the coordinate information of the slave node module through different signal strength information sent from the bluetooth module 21. Specifically, for example, in fig. 2, assuming that the positions of N1 and N3 are the left side of the vehicle, if the signal strengths of N1 and N3 are greater than N2, N4, and N5, the master node module 1 selects, according to the strength information, to send the second ranging control signal to the slave node modules, e.g., N1 and N3, corresponding to at least 2 slave bluetooth units 21 with the strongest signal strengths, and after receiving the second ranging control signal, N1 and N3 will turn on the first ultra wideband unit 22 to perform accurate ranging on the vehicle key. While the first ultra-wideband unit 22 on N2, N4, N5 will not activate. Meanwhile, the signal strength of N1 and N3 is greater than that of N2, N4 and N5, so that the key of the vehicle can be judged to be positioned on the left side of the vehicle. As shown in fig. 3, the two locating points M1 and M2 are obtained from the positions of the two slave node modules 2 and the distances between the two slave node modules and the vehicle key, but since the master node module 1 determines that the position of the vehicle key is located on the left side of the vehicle in combination with the strength information of the bluetooth broadcast signal received from the bluetooth unit 21, M2 is ignored, so as to obtain the accurate position M1 of the vehicle key, which will not generate misjudgment and can accelerate the locating procedure. By the arrangement, the number of the first ultra-wideband units 22 can be reduced while the accurate positioning of the vehicle key is ensured, so that the energy consumption is further reduced, and the operation speed is accelerated.
As shown in fig. 2, in a specific embodiment, the master node module 1 is configured to obtain the position information of the vehicle key according to the unlocked at least 2 first ultra-wideband units 22, and send an unlocking signal to the lock when the vehicle key enters a first predetermined position area a 1. Specifically, the farthest position from the vehicle in the first position area a1 should not be greater than the predetermined value r1, so that the accuracy of the lock control can be ensured, in this embodiment, the range of the first position area a1 is, for example, within a range of 2m radius around the center of the vehicle. When a user carrying the vehicle key is 10m away from the vehicle, at least 2 first ultra-wideband units 22 start to accurately position the vehicle key, and after the user enters a first position area a1 within a range of 2m away from the vehicle, the vehicle is automatically controlled to be unlocked, so that the user can conveniently enter the vehicle. The vehicle can be automatically unlocked by the user carrying the vehicle key when the user is close to the vehicle through the arrangement, manual operation of the user is not needed, and convenience is brought to the user.
In some embodiments, the master node module 1 is further configured to send a lock-off signal to the vehicle lock when the vehicle key leaves the second predetermined position area a2, the second predetermined position area a2 being greater than the first position area a1, and the second predetermined position area a2 being no greater than a predetermined value r1, for example, the first predetermined position area a1 has a radius range of 0 to 2m, and the second predetermined position area a2 has a radius range of 2 to 6 m. When the user gets off the vehicle, the vehicle is automatically locked as long as the user goes out of the second predetermined position area a 2. According to the embodiment, the situation that the vehicle is not locked due to the fact that the user forgets to lock the vehicle can be avoided through the arrangement, safety is improved, manual locking is not needed, and convenience is further provided for the user.
The master node module 1 further comprises a second ultra-wideband unit 12, the second ultra-wideband unit 12 being arranged to locate a vehicle key in cooperation with the first ultra-wideband unit 22. The master node module 1 is configured to transmit a third ranging control signal to the slave node module 2 to control all the slave node modules 2 to start ranging when the vehicle key enters the second predetermined position area a2, and start the second ultra-wideband unit 12 to perform ranging. Specifically, the second predetermined position region a2 is larger than the first position region a1, and the first position region a1 is located within the second predetermined position region a2, and the position farthest from the vehicle in the second position region a2 should not be larger than the predetermined value r 1. In the present embodiment, the second position area a2 is exemplified as being within a range of a radius of 6m with the center of the vehicle as the center. When a user carrying a vehicle key is 10m away from the vehicle, at least two first ultra-wideband units 22 with the strongest Bluetooth broadcast signal strength start to accurately position the vehicle key by taking N1 and N3 as examples, after the user enters a second position area a2 according to the vehicle 6m, the master node module 1 sends a third ranging control signal to all slave node modules 2, all the slave node modules 2 can open the first ultra-wideband units 22 after receiving the third ranging control signal, at the moment, all the first ultra-wideband units 22 simultaneously measure the distance of the vehicle key, and the accuracy of positioning the vehicle key is further improved. Meanwhile, the master node module 1 can also start the second ultra-wideband unit 12, the second ultra-wideband unit 12 and the first ultra-wideband unit 22 measure the distance of the vehicle key at the same time, and finally, the master node module 1 integrates the distance measurement results of the second ultra-wideband unit 12 and all the first ultra-wideband units 22 to obtain the accurate position information of the vehicle key. The accurate position of the vehicle key is judged through the accurate position information, and when the accurate position enters a first position area a1 within a range of 2m from the vehicle, the unlocking of the vehicle is automatically controlled, thereby further improving the accuracy and sensitivity of the locking control.
In a particular embodiment, as shown in fig. 1, the master node module 1 further comprises a bus control unit 13 and an interface unit 14. The bus control unit 13 is configured to send a control signal to the slave node module and the lock according to a position of the vehicle key, and the bus control unit 13 includes a computer control system, such as a single chip or a programmable controller, that can perform processing such as calculation on data. The interface unit 14 has a plurality of interfaces, and the plurality of slave node modules 2 are connected to the master node module 1 through the interface unit. The control signal from the bus control unit 13 is transmitted to the slave node module 2 or the vehicle lock through the interface unit 14 to complete the above-mentioned operation of the vehicle entry system. The slave node module 2 also includes associated elements corresponding to the control unit 13 and the interface unit 14, which cooperate with the master node module 1 to accomplish the above-mentioned tasks.
In one particular embodiment, as shown in fig. 2, the vehicle access system includes 5 slave node modules 2, disposed at respective peripheral and overhead locations of the vehicle. Specifically, in the present embodiment, 4 slave node modules N1, N2, N3, N4 are respectively provided at the left and right ends of the front and rear bumper of the vehicle, and 1 slave node module N5 is provided at the top of the upper rear seat in the vehicle. The slave node modules 2 are dispersedly arranged at different positions of the vehicle, so that the distance difference between the slave node modules and the vehicle key obtained in distance measurement can be larger, and the Bluetooth signal intensity difference of the received vehicle key is larger, and the master node module 1 can calculate the position of the vehicle key more easily and accurately.
An embodiment of the present invention further provides a vehicle entering method, as shown in fig. 4, the method is implemented based on the vehicle entering system, and includes the following steps:
s1, the master Bluetooth unit 11 on the master node module 1 sends a Bluetooth connection request to the vehicle key;
s2, detecting the distance between the vehicle and the vehicle key after the master Bluetooth unit 11 is successfully connected with the vehicle key through Bluetooth;
s3, responding to the distance smaller than a preset value r1, sending a ranging control signal to each slave node module 2 to control each slave node module 2 to start ranging;
s4, each slave node module 2 detects the Bluetooth broadcast signal of the vehicle key through the slave Bluetooth unit 21 in response to receiving the ranging control signal, and transmits the intensity information of the Bluetooth broadcast signal to the master node module 1;
s5, the master node module 1 sends a second ranging control signal to the slave node modules 2 corresponding to at least 2 slave Bluetooth units 21 with stronger signal strength according to the strength information;
s6, at least 2 slave node modules 2 corresponding to the slave Bluetooth units 21 respond to the received second ranging control signals, measure the distance information between the vehicle key and the slave node modules 2 through the first ultra-wideband unit 22, and send the distance information to the master node module 1;
s7, the master node module 1 determines the position information of the vehicle key according to the distance information;
and S8, controlling the vehicle lock according to the position information.
The embodiment can realize accurate positioning of the vehicle key through the steps, improve the operation speed, accuracy and sensitivity of vehicle lock control, and control the power consumption at a lower level.
As shown in fig. 5, in some alternative embodiments, the step S6 of measuring the distance information between the vehicle key and the slave node module 2 through the first ultra-wideband unit 22 includes the following steps:
s61, the first ultra-wideband unit sends out an electromagnetic wave signal to the vehicle key;
and S62, calculating the distance between the vehicle key and the corresponding slave node module by the time of flight method through receiving the signal returned by the vehicle key.
The present embodiment can realize the accurate ranging of the vehicle key using the first ultra-wideband unit 22 by performing the above steps S61 and S62, thereby realizing the highly accurate positioning of the vehicle key.
As shown in fig. 6, in some alternative embodiments, the step S7 includes the following steps:
s71, the main node module 1 obtains at most two positioning points according to the distance information sent by the slave node module 2 corresponding to at least 2 slave Bluetooth units 21;
s72, determining the orientation of the vehicle key according to the strength information of each Bluetooth broadcast signal;
and S73, determining one of the at most two positioning points as the position of the vehicle key according to the orientation.
In the above manner, the embodiment can realize that the vehicle key can be accurately positioned when only two first ultra-wideband units 22 are opened, so that the positioning accuracy is ensured, and the energy consumption is reduced to the maximum extent and the operation speed is accelerated.
As shown in fig. 7, in a specific embodiment, the specific steps of step S8 are as follows:
s81, judging whether the vehicle key enters the first preset position area a 1;
s82, responding to the key entering the first preset position area a1, sending an unlocking signal to the lock; or
S83, judging whether the vehicle key leaves the second preset position area a 2;
and S84, transmitting a lock-off signal to the lock in response to the vehicle key leaving the second predetermined position region a 2.
This embodiment has given the concrete control mode according to position information control vehicle lock through above-mentioned mode, can realize being close to or keeping away from the vehicle according to the user through this kind of mode, carries out automatic switch to the lock, need not user manual operation, has promoted user experience to avoid the user to forget the emergence of the shut-down lock condition, improved the security.
As shown in fig. 8, in some alternative embodiments, the step S8 may further include the following steps:
s801, responding to the fact that the vehicle key enters a second preset position area a2, sending a third ranging control signal to the slave node module 2 to control all the slave node modules 2 to start ranging, and starting the second ultra-wideband unit 12 to perform ranging;
s802, the slave node module 2 responds to the received third ranging control signal, the first ultra-wideband unit 22 measures the third ranging control signal to obtain distance information, the distance information is sent to the master node module 1, and the second ultra-wideband unit 12 measures the third ranging control signal to obtain second distance information;
s803, the main node module 1 determines the accurate position information of the vehicle key together according to the distance information and the second distance information;
and S804, controlling the vehicle lock according to the accurate position information.
By dividing the above step S8 into four steps S801 to S804, the present embodiment can unlock all the first and second ultra-wideband units 22 and 12 when the vehicle key is close enough to the vehicle while performing the steps S41 to S43 in the above embodiment to reduce energy consumption, thereby further improving the accuracy of positioning the vehicle key and further improving the accuracy and sensitivity of controlling the lock switch of the vehicle.
According to the vehicle entering method, the following is specifically exemplified in conjunction with fig. 2 and 3:
when a user wears a vehicle key to walk into a vehicle, the master node module 1 detects the vehicle key through the first bluetooth unit 11 and establishes bluetooth connection with the vehicle key at a range of about 50m (assuming that the connection range of the first bluetooth unit 11 is 50m), if the traveling speed of the user is preset to be 1m/s, the time for the user to continue to walk to a position 10m away from the vehicle (assuming that the distance preset value r1 is 10m) is calculated to be about 40s, so that after 40s, the master node module 1 starts the slave bluetooth unit 21 of the slave node module 2 to acquire the signal strength information broadcasted by the vehicle key by using the RSSI method, obtains the coordinate position of the vehicle key by comparing and analyzing the signal strength information, for example, the signal strength of N1 and N3 is high, obtains the coordinate position of the vehicle key to be the left side of the vehicle, starts ranging from the first ultra wideband unit 22 on the nodes N1 and N3, the first ultra wideband units 22 on other slave node modules 2 do not participate in positioning, through the calculation of the N1 and N3 modules, two positioning positions M1 and M2 can be obtained, and since the effective coordinate position is determined to be the left area of the vehicle before, the invalid point M2 is eliminated, the accurate coordinate information of the vehicle key can be rapidly calculated to be M1, and the method is adopted to realize rapid positioning identification. When the user walks into the area range of the a2 (for example, the range of 6m from the vehicle), the first ultra-wideband unit 22 on all the slave node modules 2 is started to assist in calculating the coordinate position of the vehicle key, so that the positioning of the vehicle key is more accurate. When the user walks into the area of the vehicle a1 (for example, 2m away from the vehicle), the vehicle lock is automatically opened. When the user leaves the area range of the vehicle a2 (for example, the range of 6m from the vehicle), the vehicle lock is automatically closed.
In some alternative embodiments, the first predetermined location area a1 includes a plurality of sub-areas. As shown in fig. 9, in this embodiment, the steps S81 and S82 may further include the following steps:
s811, judging whether the vehicle key enters the subarea z;
and S821, responding to the vehicle key entering the sub-area z, and sending an unlocking signal to the lock at the position corresponding to the sub-area z.
For example, as shown in fig. 2, the first predetermined position area a1 is divided into four sub-areas z1, z1, z2 and z3, which correspond to four doors s1, s2, s3 and s4, respectively, and when a user carrying a vehicle key walks into the area z1, the door s1 is automatically opened, and the remaining doors are not opened. In this embodiment, the security of unlocking the vehicle can be improved.
In summary, in the vehicle entry system and the vehicle entry method according to the embodiments of the present invention, a master node module having a master bluetooth unit is installed on a vehicle, and at least 3 slave node modules having slave bluetooth units and first ultra-wideband units are installed around the vehicle, the master bluetooth unit is used to detect a distance between the vehicle and a vehicle key, and when the distance is smaller than a predetermined value, a ranging control signal is sent to control the slave bluetooth unit to detect a broadcast signal strength of the vehicle key, the first ultra-wideband units on at least 2 slave node modules having stronger signal strength range the vehicle key, and finally, accurate position information of the vehicle key is obtained according to the distance information to control a vehicle lock. Through the system setting and the method, the invention greatly improves the positioning accuracy of the vehicle key by the vehicle entering system while ensuring lower energy consumption, thereby improving the sensitivity and accuracy of unlocking and locking and improving the user experience.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A vehicle access system, comprising:
the master node module is arranged on a vehicle and is in communication connection with a vehicle lock of the vehicle, and the master node module comprises a master Bluetooth unit and is used for wirelessly connecting a vehicle key and controlling the vehicle lock to be switched on and off according to the position of the vehicle key; and
the system comprises at least 3 slave node modules, a master node module and a slave node module, wherein the 3 slave node modules are respectively installed on the periphery of the vehicle and are respectively in communication connection with the master node module, each slave node module comprises a slave Bluetooth unit and a first ultra-wideband unit, and the slave node modules are used for wirelessly connecting the vehicle key and determining the position of the vehicle key; wherein,
the master node module is configured to detect a distance between the vehicle and a vehicle key through the master Bluetooth unit, send a ranging control signal to each slave node module to control each slave node module to start ranging when the distance is smaller than a preset value, send strength information of the Bluetooth broadcast signal to the master node module after each slave Bluetooth unit starts ranging, and select to send a second ranging control signal to the slave node modules corresponding to at least 2 slave Bluetooth units with stronger signal strength according to the strength information;
each slave node module is configured to turn on a slave bluetooth unit in response to receiving the ranging control signal, to detect a bluetooth broadcast signal of the vehicle key, and to transmit intensity information of the bluetooth broadcast signal to the master node module;
the slave node module corresponding to the at least 2 slave Bluetooth units is configured to turn on the first ultra-wideband unit in response to receiving the second ranging control signal, measure distance information of the vehicle key from the slave node module, and transmit the distance information to the master node module;
the master node module is further configured to determine position information of the vehicle key according to the distance information, and control the vehicle lock according to the position information.
2. The vehicle entry system of claim 1, wherein the first ultra-wideband unit is configured to emit an electromagnetic wave signal to the vehicle key and calculate a distance between the vehicle key and the corresponding slave node module in a time-of-flight method by receiving a time of a signal returned by the vehicle key.
3. The vehicle entry system of claim 1 or 2, wherein the master node module is configured to obtain the location information of the vehicle key from the at least 2 unlocked first ultra-wideband units, send an unlock signal to the lock when the vehicle key enters a first predetermined location area, and send a lock-off signal to the lock when the vehicle key leaves a second predetermined location area, the second predetermined location area having a greater radius from the vehicle than the first predetermined location area.
4. The vehicle entry system of claim 1, wherein the master node module is further configured to derive at most two anchor points from the distance information transmitted by the slave node modules corresponding to the at least 2 slave bluetooth units, and to determine the position of the vehicle key from the strength information of each of the bluetooth broadcast signals, and to determine one of the at most two anchor points as the position of the vehicle key from the position.
5. The vehicle access system of claim 1, wherein the master node module further comprises:
the second ultra-wideband unit is used for positioning the vehicle key together with the first ultra-wideband unit;
the master node module is configured to send a third ranging control signal to the slave node modules to control all the slave node modules to start ranging when the vehicle key enters a second predetermined location area and start the second ultra-wideband unit to perform ranging.
6. The vehicle access system of claim 5, wherein the master node module further comprises:
the bus control unit is used for sending control signals to the slave node module and the lock according to the position of the vehicle key; and
and the slave node module is connected with the master node module through the interface unit.
7. The vehicle access system of claim 1, comprising 5 slave node modules disposed at respective peripheral and overhead locations of the vehicle.
8. A vehicle entry method, comprising the steps of:
a main Bluetooth unit on the main node module sends a Bluetooth connection request to a vehicle key;
after the master Bluetooth unit is successfully connected with the vehicle key in a Bluetooth mode, detecting the distance between the vehicle and the vehicle key;
in response to the distance being less than a predetermined value, sending a ranging control signal to each slave node module to control each slave node module to initiate ranging;
each slave node module responds to the received ranging control signal, detects a Bluetooth broadcast signal of the vehicle key through a slave Bluetooth unit, and sends the strength information of the Bluetooth broadcast signal to the master node module;
the master node module selects to send a second ranging control signal to the slave node modules corresponding to at least 2 slave Bluetooth units with stronger signal strength according to the strength information;
the slave node modules corresponding to the at least 2 slave Bluetooth units respond to the second ranging control signal, measure the distance information between the vehicle key and the slave node module through a first ultra-wideband unit, and send the distance information to the master node module;
the master node module determines the position information of the vehicle key according to the distance information;
and controlling the vehicle lock according to the position information.
9. The vehicle entry method of claim 8, wherein said measuring distance information of the vehicle key from the slave node module by the first ultra-wideband unit comprises:
the first ultra-wideband unit sends out an electromagnetic wave signal to the vehicle key;
and calculating the distance between the vehicle key and the corresponding slave node module by a time-of-flight method through the time of receiving the signal returned by the vehicle key.
10. The vehicle entry method according to claim 8 or 9, wherein said controlling a vehicle lock according to the position information comprises:
in response to the vehicle key entering a first predetermined location area, sending an unlock signal to the vehicle lock;
in response to the vehicle key leaving a second predetermined location area, sending a lock-off signal to the vehicle lock.
11. The vehicle entry method of claim 8, wherein the master node module determining the location information of the vehicle key from the distance information comprises:
the master node module obtains at most two positioning points according to the distance information sent by the slave node modules corresponding to the at least 2 slave Bluetooth units;
determining the position of the vehicle key according to the strength information of each Bluetooth broadcast signal;
and determining one of the at most two positioning points as the position of the vehicle key according to the position.
12. The vehicle entry method of claim 8, wherein said controlling a vehicle lock based on said location information comprises:
responding to the vehicle key entering a second preset position area, sending a third ranging control signal to the slave node modules to control all the slave node modules to start ranging, and starting a second ultra-wideband unit to perform ranging;
the slave node module responds to the third distance measurement control signal, obtains distance information through measurement of the first ultra-wideband unit, sends the distance information to the master node module, and obtains second distance information through measurement of the second ultra-wideband unit;
the master node module determines the accurate position information of the vehicle key according to the distance information and the second distance information;
and controlling the vehicle lock according to the accurate position information.
13. The vehicle entry method of claim 10, wherein the first predetermined location area comprises a plurality of sub-areas;
said transmitting an unlock signal to said lock in response to said vehicle key entering a first predetermined location area comprises:
and responding to the entry of the vehicle key into the sub-area, and sending an unlocking signal to the lock at the position corresponding to the sub-area.
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| CN114299644B (en) | 2024-08-06 |
| TW202306813A (en) | 2023-02-16 |
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