The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
 Aiming at the problems that the existing electronic remote control key used to control the vehicle has single function, is inconvenient to carry and is easy to lose, this embodiment proposes a design scheme of using a smart wristband to control the vehicle. The function of the electronic remote control key is integrated on the smart wristband, so that the user only needs to operate on the smart wristband to complete the control of the vehicle opening and locking, and the smart wristband can realize the safety of starting the vehicle and parking the vehicle Detection and early warning solve the problems of vehicle anti-theft and driving safety to a large extent.
 The following first combines Figure 1-Figure 3 , the hardware composition and working principle of the smart wristband of this embodiment are described in detail.
 see figure 1 , figure 2 As shown, the smart wristband of this embodiment includes main components such as a body 1 , a wristband 2 and a lock 3 . Wherein, the main body 1 is installed on the wristband 2, preferably a notch is formed in the central part of the wristband 2, and the main body 1 is embedded in the notch, so as to strengthen the installation of the main body 1 in the wristband 2. . For the convenience of wearing, in this embodiment, the wristband 2 is designed as a watchband structure, such as figure 2 As shown, that is, in the open state, it is a long strip, one end is provided with an adjustment hole 4, and the other end is provided with a lock 3. When wearing, you only need to select a suitable adjustment hole 4 according to the size of the user's wrist, insert the lock 3 into the adjustment hole 4 to form a ring shape, and put it on the user's wrist, which is easy to carry and can also be used. Effectively prevent loss.
 In the main body 1 is provided as image 3 The functional modules shown mainly include a central processing module, a radio frequency module, a display/prompt warning module, a motion acquisition module, a heart rate acquisition module, and a power supply module. Among them, the central processing module, as the core control component, is connected with other functional modules to coordinate and control the other functional modules. In order to reduce the volume of the body 1 of the smart wristband and facilitate circuit design, this embodiment preferably uses a single-chip microcomputer with a simple peripheral circuit to design the central processing module to realize its centralized control function.
 In order to realize wireless communication between the smart wristband and the vehicle, in this embodiment, a radio frequency module is set in the smart wristband, connected to the central processing module, and under the control of the central processing module, the control commands are transmitted in the form of radio frequency signals and interactive data.
As a preferred design solution of this embodiment, three types of functional modules, an electronic tag, a mobile communication module and a Bluetooth module, can be set in the radio frequency module at the same time, and are respectively connected to the central processing module. Among them, the electronic tag is used to match with the RFID reader built in the car, and the RFID (Radio Frequency Identification, radio frequency identification) technology is used to realize the induction of the smart wristband by the vehicle. Specifically, when the smart wristband approaches the car, the electronic tag generates an induced current under the action of the RFID reader, which is output to the central processing module. The belt goes from standby mode to normal operation mode. The mobile communication module (such as GSM module, CDMA module, etc.) is used to establish communication with the vehicle-mounted base station built in the car, and supports long-distance transmission of commands and data. The Bluetooth module is used for Bluetooth communication with the car audio built in the car, so as to play reminders and warnings about safe driving through the car audio to enhance the warning effect.
 In order to facilitate the user to operate the smart wristband and realize the prompt and early warning function of the smart wristband, in this embodiment, a display/prompt early warning module is set in the smart wristband, including a touch display screen 5, a buzzer 6 and a vibration motor , respectively connected to the central processing module, combined with figure 1 shown. Among them, the touch screen 5 is used to display inquiry and prompt information, and when the user needs to open or lock the vehicle door, a door opening button and a door locking button are provided for the user to operate. The buzzer 6 is used for sound warning to remind the user to pay attention to vehicle safety. The vibration motor is used for vibration warning to remind users to pay attention to driving safety.
 The motion acquisition module is used to collect the user's actions, generate motion data and send it to the central processing module to identify the user's behavior. For example, when the smart wristband approaches the vehicle and is activated, the user can control the door to automatically open by making a gesture to open the door; when the user gets out of the car, the motion acquisition module can sense the user's alighting action, and then detect when the user gets off the car. When you forget to lock the door, remind the user in time to prevent the vehicle from being lost.
 As a preferred design solution of this embodiment, the motion acquisition module preferably uses an acceleration sensor to sense the user's motion.
 The heart rate collection module is used to collect the user's heart rate, and is connected to the central processing module. During the driving process, the heart rate change of the driver is collected by the heart rate acquisition module and the action response of the driver (such as the speed and fluency of arm movement) is collected by the motion acquisition module, so as to infer whether the driver's physical condition is abnormal. When an abnormality is detected, the central processing module controls the display/prompt warning module to issue early warning information to remind the driver to pay attention in time to improve driving safety.
 As a preferred design solution of this embodiment, the heart rate collection module preferably adopts a heart rate sensor to collect the change of the user's heart rate.
 The working power required for the central processing module, radio frequency module, display/prompt warning module, motion acquisition module, and heart rate acquisition module can be uniformly provided by the power supply module. In this embodiment, the power module is preferably designed by using a battery, a charging unit and a voltage regulator. Wherein, the battery preferably uses a rechargeable battery (such as a lithium battery, etc.) to store electrical energy. The charging unit is connected to the charging interface 7 on the smart wristband, combined with figure 2 As shown, the external power supply is received through the charging interface 7 and converted into a low-voltage DC power supply to charge the battery. The voltage stabilizer is preferably connected to the battery by a low-dropout linear voltage stabilizer LDO, and the voltage output by the battery is converted to generate a central processing module, a radio frequency module, a display/prompt warning module, a motion acquisition module, and a heart rate acquisition module. The working power supply required by the module supplies power to these functional modules to meet their working requirements.
 Combine below Figure 4 , the vehicle control method based on the smart wristband design will be described in detail.
 S401, the smart wristband works in a standby mode when not in use.
 When the smart wristband does not need to be used to control the car, in order to save battery power and prolong the battery life of the smart wristband, this embodiment designs the smart wristband to automatically enter the standby mode when not in use to reduce energy consumption.
 In standby mode, the central processing module is running in standby mode and only consumes very little energy; the radio frequency module, display/prompt warning module, motion acquisition module and heart rate acquisition module all stop running to avoid wasting energy.
 S402, when the driver wears the smart wristband and approaches the car and enters the vehicle identification area, activate the radio frequency module in the smart wristband, and make the smart wristband transfer from the standby mode to the running mode.
 In this embodiment, it is considered that if the mobile communication module in the radio frequency module is directly used to cooperate with the vehicle-mounted base station in the car to realize the detection of the smart wristband entering the vehicle identification area, the standby power consumption of the smart wristband will increase. , the problem of shortening the use time after a single charge, therefore, in this embodiment, an electronic tag is set in the radio frequency module, and the RFID technology is used to perform short-range matching communication with the RFID reader configured in the car, so as to realize the smart wristband. Accurate identification of whether to enter the car identification area.
 In this embodiment, the electronic tag is preferably a passive radio frequency tag, which has no power consumption during standby, so as to further reduce energy consumption.
 The vehicle identification area is determined according to the effective radiation range of the RFID reader. When the driver wears the smart wristband and approaches his car, the electronic tag in the smart wristband enters the magnetic field generated by the RFID reader, thereby generating an induced current and transmitting it to the central processing module to control the central processing module to start running . After the central processing module starts running, it activates the mobile communication module in the radio frequency module and enters the authentication process.
 As a preferred design solution of this embodiment, after the central processing module starts running, it is preferred to control other functional modules in the smart wristband to switch from standby mode to normal operation mode to facilitate user operation.
 S403 , the smart wristband controls the mobile communication module to establish communication with the vehicle-mounted base station through its central processing module, and sends a verification code to the vehicle-mounted base station for authentication.
 In this embodiment, after the mobile communication module in the smart wristband is activated, the mobile communication module sends a pre-stored verification code to the vehicle-mounted base station for identity verification. After receiving the verification code, the vehicle base station compares it with the pre-stored verification code. If it is consistent, it passes the verification, determines the smart wristband that is currently close to the vehicle as an authorized wristband, and responds to the user's follow-up operation; If they are inconsistent, it means that the smart wristband currently approaching the vehicle is an unauthorized wristband and does not respond to the operation of the smart wristband on the vehicle.
 S404. After the authentication is passed, the vehicle-mounted base station receives an instruction to open the vehicle door sent by the smart wristband, and controls the vehicle door to be automatically unlocked.
 In this embodiment, when the vehicle-mounted base station detects that the verification code sent by the smart wristband is correct, it sends an inquiry instruction to the smart wristband whether to open the vehicle door. After the smart wristband receives the inquiry command, on the one hand, it displays the door opening button on its touch screen, which is provided to the user to perform the unlocking operation; A specific gesture to open the car door is issued. When the user needs to open the door, he can either control the door lock to automatically open by touching the door opening button on the smart wristband, or control the door to automatically unlock by making a specific gesture action (such as a gesture to open the door).
 After the central processing module in the smart wristband receives the door opening instruction input by the user by touching the door opening button through the touch screen, or after the motion acquisition module detects that the user has made a specific gesture to open the door, it generates a door opening instruction. The command is sent to the vehicle base station through the mobile communication module. The vehicle base station sends the received instruction to open the vehicle door to the control system in the vehicle to control the automatic unlocking of the vehicle door.
 S405 , when the vehicle is started, inquire whether there is an authorized smart wristband within the effective range, and issue a prompt message to give an early warning when no authorized smart wristband is detected.
 In this embodiment, in order to confirm the valid identity of the driver and prevent the thief from starting the vehicle illegally, the vehicle-mounted base station is designed to automatically query whether there is an authorized wristband in the valid range when detecting that the vehicle is started. (the effective range is preferably limited to the in-vehicle range), you can also use the RFID reader/writer configured on the vehicle to cooperate with the vehicle-mounted base station to inquire whether there is an authorized smart wristband within the effective range.
 If an authorized smart wristband is detected within the valid range, it means that the vehicle is started by the owner; if no authorized smart wristband is detected within the valid range, the car can also be started, but the vehicle base station will send a prompt message for smart wristbands. After receiving the prompt information, the smart wristband displays the prompt information of "the vehicle has started abnormally" through its touch screen, and reminds the user by driving its buzzer to sound and/or driving its vibration motor to vibrate Pay attention to this reminder to reduce the risk of vehicle loss.
 S406. During the driving process, the physical condition of the driver is detected through the smart wristband, and when an abnormality is found, the driver is reminded to drive safely.
 In this embodiment, the vehicle-mounted base station is designed to send a piece of status information of the vehicle's startup to the authorized smart wristband after the vehicle is started. The smart wristband collects the driver's heart rate change through the heart rate collection module after receiving the state information of the car's startup, and collects the driver's arm movement through the motion collection module, and combines the two collected information to infer. the physical or mental condition of the driver. For example, if it is detected that the driver's heart rate changes smoothly and the reaction speed (action speed and fluency, etc.) is normal, it is inferred that the driver's physical and mental conditions are normal; if it is detected that the driver's heart rate is too fast and the arm trembles, etc. If it is detected, it is inferred that the driver may be driving under the influence of alcohol; if it is detected that the driver's heart rate is slow and the movement is sluggish, it is inferred that the driver may be driving fatigued; and so on.
 When the smart wristband detects that the driver's physical condition or mental condition is abnormal, it will start its vibration motor to drive the wristband to vibrate, or send the warning information to the car audio through its Bluetooth module, and play the warning signal through the car audio to remind the user to be safe. drive.
 During the driver's entire driving process, the smart wristband will detect the driver's physical condition at intervals, and the detection interval is related to the driver's current physical condition. With the prolongation of time, the probability of fatigue driving may increase, so the time interval for adjusting the detection is gradually shortened with the prolongation of driving time, so as to improve the safety of the whole driving process.
 S407. When the driver gets off the vehicle, prompt the driver to lock the door through the smart wristband.
 In this embodiment, the smart wristband is designed to firstly display the door lock button through its touch screen after detecting the driver's getting off action, so as to provide the user with the door lock operation. Then, the timer is started to count, and if the door lock instruction has not been received after the set time or the motion acquisition module detects that the user is far away from the car beyond the set distance, a prompt message will be sent to remind the user to lock the door.
In this embodiment, the door lock instruction can be generated through two channels: First, after the user gets out of the car, by operating the door lock button on the smart wristband, the door lock instruction is generated and sent to the vehicle base station to control the vehicle Automatic locking; second, the user locks the door by operating the door lock button on the car door handle after getting off the car. At this time, the vehicle base station generates a door lock command and sends it to the smart wristband to end the lock in the smart wristband. Door detection process.
 The present invention adopts a traditional car key in the form of a wristband, which is easy to carry and not easy to lose. By introducing a central processing module, a display/prompt warning module, etc., the functions of the car electronic key are strengthened, the authentication restrictions on the opening and use of the car are strengthened, and the anti-theft function of the car is enhanced. In addition, by introducing the acquisition sensors related to human health information, it provides a scientific theoretical basis for the safe driving of the car, and can provide users with direct and reasonable driving suggestions and reminders, which enhances the safe driving function of the car.
 Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the present invention should also belong to protection scope of the present invention.