Passenger seat belt and passenger seat occupancy detection system, and passenger vehicle

Abstract

A passenger seat belt and passenger seat occupancy detection system, and a passenger vehicle. Each CAN module records a number of the CAN module on the basis of an ID field in a wake-up message received from the upstream of a CAN link, and sends a wake-up message having a different ID field to the downstream of the CAN link; on the basis of the number of the CAN module, each CAN module obtains a certain number of ID fields, which are used by the CAN module to upload, to the upstream of the CAN module, a passenger seat state signal of the CAN module and all received passenger seat state signals uploaded by downstream CAN modules, wherein the passenger seat state signal comprises the condition of connected passenger seats detected by corresponding CAN module pins and a detection result corresponding to each pin; and a vehicle-mounted controller obtains the detection result of each passenger seat on the basis of the ID fields of the received passenger seat state signals and correspondences.

Description

A passenger seat seat belt and occupant detection system and a bus Technical Field

[0001] This invention relates to a passenger seat belt and a passenger detection system, as well as a bus, belonging to the field of bus passenger safety protection. Background Technology

[0002] To ensure passenger safety, drivers must remind passengers to sit firmly and fasten their seatbelts when riding a bus. However, the large number of passenger seats on buses, varying significantly across different lengths and purposes, makes detection difficult. Currently, a common solution is to install a wireless detection module on each passenger seat. These modules transmit the detected occupancy and seatbelt status to a main unit for systematic monitoring.

[0003] Chinese patent application CN116788199A discloses a wireless communication method and system for seat belts. This method relies on a tension detection device installed in each seat and a slave controller to detect whether the seat belt is fastened. The slave controller sends a slave data signal including the seat belt buckle status detected by the tension detection device. The slave controller needs to be activated via wireless communication with the vehicle and sends the slave data signal to the master controller, which can help the driver remind passengers to pay attention to safety.

[0004] However, this approach has problems such as high design cost, easy failure of wireless communication, and detection failure due to inconsistent battery life in the wireless module, since each seat needs to be equipped with a detection device and a controller. Each module needs to be calibrated or different software needs to be used to identify the seat order. Summary of the Invention

[0005] The purpose of this invention is to provide a passenger seat belt and passenger detection system and bus, in order to solve the problems of high cost and easy failure in the prior art of identifying whether passengers are wearing seat belts in buses.

[0006] To achieve the above objectives, the present invention includes:

[0007] This invention discloses a passenger seat seatbelt and occupant detection system, comprising a CAN link connected to an on-board controller and consisting of a plurality of CAN modules connected sequentially. Each pin of each CAN module detects the connection to each passenger seat according to a corresponding relationship to obtain detection results including the occupant and seatbelt status. Each CAN module records its own number based on the ID field of a wake-up message received from upstream of the CAN link and sends wake-up messages with different ID fields downstream of the CAN link. Each CAN module obtains a certain number of ID fields based on its own number, used to upload its own passenger seat status signal and the passenger seat status signals received from all downstream CAN modules upstream. The passenger seat status signal includes the passenger seat connection status detected by the corresponding CAN module pin and the detection results corresponding to each pin. The on-board controller obtains the detection results of each passenger seat based on the ID fields of the received passenger seat status signals and the aforementioned correspondence.

[0008] Furthermore, when the CAN module detects the seat belt status and the seated status of the passenger seat, one pin is triggered by a normally closed switch and the other by a normally open switch. When the CAN module is powered on, if the pin does not detect a closed switch, the CAN module assumes that no passenger seat is connected at this point.

[0009] Furthermore, the CAN module uses a normally closed switch to trigger when detecting the seat belt status of the passenger seat, and a normally open switch to trigger when detecting the occupant status of the passenger seat.

[0010] Furthermore, there are two CAN links, used to detect the passenger seats connected to the left and right sides of the carriage, respectively.

[0011] Furthermore, for the door side, when the CAN module's pins detect a connection to the passenger seat, it distinguishes whether the passenger seat detected by the CAN module is located in front of or behind the door by whether a specific pin always detects a connection to the passenger seat or never detects a connection to the passenger seat.

[0012] Furthermore, the CAN module also includes a CAN transceiver, which uses a PNM-enabled transceiver to manage the wake-up and sleep states of the CAN module.

[0013] A bus includes a CAN link connected to an onboard controller, consisting of several CAN modules connected sequentially. Each pin of each CAN module detects the connection to each passenger seat according to a corresponding relationship to obtain detection results including occupancy and seat belt status. Each CAN module records its own number based on the ID field of a wake-up message received from upstream of the CAN link and sends wake-up messages with different ID fields downstream of the CAN link. Each CAN module obtains a certain number of ID fields based on its own number, which are used to upload its own passenger seat status signal and the passenger seat status signals uploaded by all downstream CAN modules to its upstream. The passenger seat status signal includes the passenger seat connection status detected by the corresponding CAN module pin and the detection result corresponding to each pin. The onboard controller obtains the detection results of each passenger seat based on the ID fields and the corresponding relationships of the received passenger seat status signals.

[0014] Furthermore, when the CAN module detects the seat belt status and the seated status of the passenger seat, one pin is triggered by a normally closed switch and the other by a normally open switch. When the CAN module is powered on, if the pin does not detect a closed switch, the CAN module assumes that no passenger seat is connected at this point.

[0015] Furthermore, the CAN module uses a normally closed switch to trigger when detecting the seat belt status of the passenger seat, and a normally open switch to trigger when detecting the occupant status of the passenger seat.

[0016] Furthermore, there are two CAN links, used to detect the passenger seats connected to the left and right sides of the carriage, respectively.

[0017] Furthermore, for the door side, when the CAN module's pins detect a connection to the passenger seat, it distinguishes whether the passenger seat detected by the CAN module is located in front of or behind the door by whether a specific pin always detects a connection to the passenger seat or never detects a connection to the passenger seat.

[0018] Furthermore, the CAN module also includes a CAN transceiver, which uses a PNM-enabled transceiver to manage the wake-up and sleep states of the CAN module.

[0019] The beneficial effects of this invention are as follows: This invention is a pioneering invention. When detecting whether passengers in a bus are seated and whether their seatbelts are fastened, this invention uses a CAN link composed of several CAN modules connected in sequence and connected to the vehicle controller. Each pin of each CAN module detects and connects to each passenger seat according to the corresponding relationship to obtain detection results including whether the passenger is seated and whether the seatbelt is fastened. Each CAN module records its own number based on the ID field in the wake-up message received from upstream of the CAN link and sends wake-up messages with different ID fields downstream of the CAN link. Each CAN module obtains a certain number of ID fields based on its own number for uploading its own and all received passenger seat status signals from downstream CAN modules upstream. This effectively enables each CAN module to send passenger seat status signals including its own and all received signals from CAN modules. All CAN modules use the same software and materials. Each CAN module does not need to be calibrated or use different software to identify the passenger seat status in different positions, which can effectively reduce costs and realize the detection of whether each passenger seat is seated and whether the passenger's seatbelt is fastened. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the principle of a passenger seat seat belt and passenger detection system according to the present invention;

[0021] Figure 2 is a schematic diagram of the adaptive detection process of a passenger seat seat belt and passenger detection system according to the present invention.

[0022] Figure 3 is a schematic diagram of an 8-row, 3-column passenger seat arrangement in a bus carriage according to a system embodiment;

[0023] Figure 4 is a schematic diagram of the CAN module detecting and connecting to 8 rows and 3 columns of passenger seats in a system embodiment;

[0024] Figure 5 is a schematic diagram of the CAN module wake-up process of a passenger seat seat belt and passenger detection system according to the present invention.

[0025] Figure 6 is a schematic diagram of the dormancy process of a passenger seat seat belt and passenger detection system according to the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0027] The concept of this invention is to use a CAN bus built with identical software and materials based on CAN modules to detect passenger seat occupancy and seat belt status. Each CAN module detects multiple passenger seats connected to its corresponding area according to the passenger seat arrangement. Considering that multiple passenger seats need to be connected to one module simultaneously, in order for the CAN module to sequentially detect all passenger seats in the bus and to distinguish between CAN modules in the system so that the bus can identify passenger seats in specific locations, a CAN link is set up, consisting of several CAN modules connected sequentially, connected to the vehicle controller. Each pin of each CAN module detects and connects to each passenger seat according to the corresponding relationship to obtain detection results including occupancy and seat belt status. Each CAN module records its own number based on the ID field of the wake-up message received from upstream of the CAN link and sends wake-up messages with different ID fields downstream of the CAN link. When a CAN module needs to send a data message to feedback passenger seat status signals, each CAN module obtains a certain number of ID fields based on its number, which are used by the CAN module to upload its own and the data messages received from other CAN modules. (Body Control Center) The vehicle control module (VCC) determines which CAN module the data message comes from based on the ID field, and determines which passenger seats in the CAN module the passenger seat status signal comes from through the corresponding relationship.

[0028] System Implementation Example:

[0029] This embodiment provides a passenger seat belt and occupant detection system, as shown in Figure 1:

[0030] The figure illustrates the hardware architecture of a typical passenger seat seatbelt and occupant detection system according to this embodiment. It includes two CAN links corresponding to the passenger seats on the left and right sides of the vehicle compartment: the CAN1 interface of the BCM detects the passenger seat on the left side of the compartment, and the CAN2 interface of the BCM detects the passenger seat on the right side. Each CAN link includes several CAN modules. Each CAN module includes a CAN1 interface, a CAN2 interface, a wake-up CAN transceiver, a power module, and an MCU (Microprogrammed Control Unit). The wake-up CAN transceiver uses a transceiver supporting PNM (Partial Network Management). Each CAN module is connected to and detects several passenger seats according to the passenger seat arrangement.

[0031] The bus's BCM is based on different CAN communication interfaces and can send CAN data frames to the CAN link. The BCM transmits the data frames received from each CAN module from different communication interfaces to the display system via the CAN bus. The display system includes the in-vehicle multimedia center (CDC), the central control screen, the first in-vehicle display screen, the second in-vehicle display screen, etc. The display system processes the corresponding data and displays and provides reminder logic.

[0032] Specifically, the present invention will be described below using an example where each CAN module has 12 pins in one column. Since each seat needs to detect whether a person is seated and whether the seat belt is inserted, each seat requires two pins. That is, the CAN module in this embodiment supports the detection of 6 seats or less. The CAN module pins are numbered 1 to 6 (the pin numbered X represents a group of two pins connected to a passenger seat). In order for the display system to accurately display the passenger seats in front of and behind the doors, for all passenger seats installed in front of the door on the side with the door or on the side without the door, pin 1 of its CAN module will always be connected to the passenger seat; for passenger seats installed behind the door on the side with the door, pin 1 of its CAN module will not be connected to the passenger seat, and pins 2 and later will be connected to the passenger seat.

[0033] The CAN module uses two microswitches to detect whether the connected passenger seat is occupied and whether the seatbelt is fastened. When someone sits in the corresponding passenger seat, the corresponding microswitch is triggered, causing the CAN module to detect that the passenger seat is occupied; when the seatbelt is fastened, the corresponding microswitch is also triggered, causing the CAN module to detect that the seatbelt is fastened.

[0034] Furthermore, to facilitate the CAN module's identification of which specific pins (a set of pins connected to a passenger seat) are connected to the passenger seat, in this embodiment, the two microswitches are normally open and normally closed, respectively. When the CAN module is powered on, it first detects the normally closed signal through the pins, thereby determining that the set of pins is connected to the passenger seat. Considering that when the vehicle is empty, all passenger seats are in an unoccupied and unbelted state, one pin in the set of pins connected to a passenger seat must be connected to a closed contact; when there are passengers in the vehicle, when the passenger seat is occupied and the seatbelt is fastened, one microswitch will also be closed, thus facilitating the system's detection of all passenger seats; considering that when the vehicle is not moving, the probability of a passenger seat being occupied but not fastened is much greater than that of a passenger seat being fastened but not occupied, therefore, as the best implementation, the microswitch reflecting the seatbelt status is set to normally closed, and the microswitch reflecting the occupancy status is set to normally open.

[0035] Furthermore, under normal circumstances, passengers will fasten their seatbelts after sitting down. If normally open switches are used simultaneously, the system will only detect the presence of a passenger seat when the passenger sits down or fastens their seatbelt. If normally closed switches are used simultaneously, both microswitches will open after the common scenario of a passenger sitting down and fastening their seatbelt occurs, and the system will not be able to recognize the presence of a passenger seat (it cannot distinguish between a disconnected switch and a disconnected switch). Neither approach is conducive to the system quickly detecting all passenger seats. Therefore, when detecting whether the pins of the CAN module with corresponding numbers are connected to passenger seats, the method shown in Figure 2 is used. After the system is powered on for the first time or after executing the reset logic, all seatbelts triggered by normally closed switches must be unfastened or all passenger seats using normally open switches must be occupied. This ensures that at least one pin in a group of pins connected to a passenger seat is detected to have input. The CAN module then records the pin number connected to this passenger seat, and the system enters normal operating mode.

[0036] By designing whether the No. 1 passenger seat pin of the CAN module is left floating, the position of the passenger seat can be identified as being in front of or behind the door. The CAN modules are then connected according to the actual passenger seat positions. Figure 3 shows a bus carriage with an 8-row, 3-column passenger seat arrangement (two columns on the left side without a door, one column on the right side with a door). Taking the passenger seats on the left side of the carriage as an example, pins 1, 2, 3, 4, 5, and 6 (pin X indicates a group of two pins connected to one passenger seat) of the first CAN module (S1 module) in the left CAN link are connected to passenger seats 101-106. When the S1 module feeds back the passenger seat status signal, the "passenger seat pin arrangement" signal value is 0x01, indicating that the corresponding pin of the S1 module is connected to the side of the bus without a door (i.e.,...). The first six passenger seats in the second row and third section (left side) are connected to the doors. Pins 1, 2, 3, 4, 5, and 6 of the second CAN module (S2 module) in the CAN link are connected to passenger seats 107-112. When the S2 module provides a passenger seat status signal, the "Passenger Seat Pin Arrangement" signal value is 0x01, indicating that the six middle passenger seats in the second row and third section are connected to the doorless side (left side). Pins 1, 2, 3, and 4 of the third CAN module in the CAN link are connected to passenger seats 113-116. When the S3 module provides a passenger seat status signal, the "Passenger Seat Pin Arrangement" signal value is 0x02, indicating that the last four passenger seats in the second row and second section are connected to the doorless side (left side). The connection relationship is shown in Figure 4. In other words, 0x01 indicates that all six pins of the CAN module are connected to passenger seats, and 0x02 indicates that pins 1, 2, 3, and 4 of the CAN module are connected to passenger seats.

[0037] Taking the passenger seats on the right side of the carriage as an example, as shown in Figure 4, pins 1, 2, and 3 of the first CAN module (S1 module) in the right-side CAN link are connected to passenger seats 117-119. When the S1 module feeds back the passenger seat status signal, the "passenger seat pin arrangement" signal value is 0x03, indicating that the corresponding pin of the S1 module is connected to the first three passenger seats in the row in front of the bus door (i.e., the right side). Considering that the CAN module connecting to the passenger seats behind the door does not connect to pin 1, passenger seats 120 and 121 behind the bus door are connected to the second CAN module in the right-side CAN link. Pins 2 and 3 of the CAN module (S2 module) are connected. At this time, the "Passenger Seat Pin Arrangement" signal value of the S2 module when feeding back the passenger seat status signal is 0x04, indicating that the corresponding pin of the S2 module is connected to the two passenger seats in the first two rows of the first row behind the bus door. Passenger seat 122 behind the bus door is connected to pin 2 of the third CAN module (S3 module) in the right CAN link. At this time, the "Passenger Seat Pin Arrangement" signal value of the S3 module when feeding back the passenger seat status signal is 0x05, indicating that the corresponding pin of the S3 module is connected to the last passenger seat behind the bus door. In other words, 0x03 indicates that pins 1, 2, and 3 of the CAN module are connected to passenger seats (CAN module S1 on the right in Figure 4), 0x04 indicates that pins 2 and 3 of the CAN module are connected to passenger seats (CAN module S2 on the right in Figure 4), and 0x05 indicates that pin 2 of the CAN module is connected to passenger seats (CAN module S3 on the right in Figure 4). Of course, you can also set the signal values ​​of the passenger seat to connect to the pins of more CAN modules with different numbers as needed.

[0038] The above describes one implementation where the pins of a CAN module correspond to passenger seats, connecting sequentially to each passenger seat on one side of the carriage. When the CAN module sends a signal value representing the corresponding "passenger seat pin arrangement" to the BCM, the BCM, based on the CAN module's position in the link and the pin distribution connecting it to the passenger seats, can identify the position of each passenger seat connected to each pin. Then, based on the seatbelt and occupant detection signals for each pin, it can display the detection results for each passenger seat and issue a seatbelt alarm. Alternatively, other configurations can be used, where different pins of different CAN modules are uniquely matched with different passenger seats. Upon receiving the "passenger seat pin arrangement" signal, the BCM can then analyze and identify the positions of the passenger seats connected to different pins of different CAN modules according to the same rules.

[0039] Thus, when the system receives the "passenger seat pin arrangement" signal from all CAN modules, it can clearly know the position of all passenger seats and their relationship with the doors. When displaying the passenger seat positions on the screen, it can more clearly show the distribution of each passenger seat in the vehicle. Furthermore, after receiving the occupancy and seat belt detection signals from the pins of each CAN module connected to the passenger seats, it can display the status of the passenger seats at the corresponding positions.

[0040] Furthermore, when the system is powered on for the first time or after a system hard reset, the BCM or CAN module needs to send a specified wake-up message to the CAN1 interface of the CAN module connected to it. The wake-up process is shown in Figure 5. The following describes the wake-up process of the CAN module on the left side of the bus. When the CAN1 interface of the S1 module receives a wake-up message with an ID field of 0x101, it records its own number as 1, and then sends a wake-up message with an ID field of 0x102 to its own CAN2 interface. When the CAN1 interface of the S2 module receives a wake-up message with an ID field of 0x102, it records its own number as 2, and then sends a wake-up message with an ID field of 0x103 to its own CAN2 interface. When the CAN1 interface of the S3 module receives a wake-up message with an ID field of 0x103, it records its own number as 3. When a wake-up message sent by a certain CAN module is not responded to, the CAN module records the seat it is connected to as the rear row.

[0041] Since each CAN module has been numbered via wake-up messages, each CAN module obtains a certain number of ID fields based on its own number. When each CAN module sends its own passenger seat status signal via data packets, it only needs to add the obtained ID fields to the data packets used to feed back the passenger seat status signal. This allows it to distinguish whether the uploaded data packets are used to feed back the passenger seat status signal of the module itself or to feed back the passenger seat status signal of the downstream CAN module connected to it.

[0042] Specifically, taking the left side of the carriage shown in Figure 3 as an example, the ID field format in the CAN data message is defined as follows: the ID field format in the data message of the S1 module feeding back the passenger seat status signal is: 0x201 (defined as passenger seats 101-106 connected to CAN module S1), 0x202 (defined as passenger seats 107-112 connected to CAN module S2), 0x203 (defined as passenger seats 113-116 connected to CAN module S3); the ID field format in the data message of the S2 module feeding back the seat status signal is: 0x204 (defined as passenger seats 107-112 connected to CAN module S2), 0x205 (defined as passenger seats 113-116 connected to CAN module S3); and the ID field format in the data message of the S3 module feeding back the seat status signal is: 0x206 (defined as passenger seats 113-116 connected to CAN module S3).

[0043] Furthermore, 4-bit signals are used to define the passenger seat belt and occupant status signals, as shown in the following examples: 0x00 (no one, no seat belt, displays no one, no alarm), 0x01 (no one, seat belt in place, displays no one), 0x02 (someone, seat belt in place, displays no seat belt + alarm n times or n seconds), 0x03 (someone, seat belt in place, displays someone), 0x04 (seat belt or sensor malfunction), 0x05 (no passenger seat), 0x06~0x0D (reserved), 0x0E (stop detection), and 0x0F (invalid).

[0044] Specifically, after detecting a specific passenger seat status signal, each CAN module sends it to the BCM via the next-level CAN module. For example, when the CAN2 interface of the left-side CAN module S2 receives a passenger seat status signal from module S3 with an ID field of 0x206 in the data packet, this signal includes the pin number and the corresponding seat belt, occupancy status, and other signals. CAN module S2 changes its ID field to 0x205 (0x204 is reserved for the data packet when uploading its own passenger seat status signal) and forwards it to the CAN2 interface of CAN module S1 via its own CAN1 interface. CAN module S1 then changes its ID field to 0x203 (0x201 is reserved for uploading). The data message for the passenger seat status signal (0x202 is reserved for the data message for the CAN module S2 to upload the passenger seat status signal) is forwarded to the CAN1 interface of the BCM through its own CAN1 interface. The BCM recognizes that the passenger seat status signal is fed back by the left CAN module S3 based on the CAN1 interface and the ID field of the data message is 0x203. Then it identifies the position of the passenger seat in the bus corresponding to each pin number in the passenger seat status signal, and then sends the seat belt and occupancy status of the corresponding passenger seat to the display system. The display system processes the display and reminder logic.

[0045] When a CAN module needs to enter sleep mode, the system's sleep process is shown in Figure 6. Taking the left-hand CAN module as an example, the S1 module continuously monitors whether the sleep signal is set in the message with ID 0x101. If it is set, it stops detecting the status of the input pins and sends a data message with ID 0x102 on its own CAN2 interface, setting the sleep signal therein. This causes the connected S2 module to stop detecting the status of the input pins. The S2 module also needs to send a data message with ID 0x103 on its own CAN2 interface, setting the sleep signal therein. This continues until the last CAN module Sn stops detecting the status of the input pins. Then, each CAN module sends a sleep-ready signal on its own CAN1 interface. Once the BCM receives the sleep-ready signals from all CAN modules, it determines whether the system can enter sleep mode under the current state. If it can, the BCM sends a sleep command to module S1 and also sends a sleep command to module S2 via its own CAN2 interface, until the last CAN module Sn receives the sleep command. Each CAN module will stop sending messages and enter sleep mode after a time t after receiving the sleep command. If the current system state cannot enter sleep mode, the BCM determines whether to enter normal working mode. If it can enter normal working mode, it sets the hold-wake signal in the message, and all CAN modules enter normal working mode. If it cannot enter normal working mode, module S1 continues to listen for sleep signals on the line.

[0046] Example of a passenger vehicle:

[0047] This embodiment provides a bus equipped with a passenger seat seat belt and a passenger detection system as described in the system embodiment. Since the system embodiment has provided a sufficiently clear description of the system, it will not be repeated here.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

A passenger seat belt and occupant detection system characterized by The CAN module includes a CAN transceiver, and the CAN transceiver is a transceiver supporting PNM, and is used for implementing the wake-up and sleep management of the CAN module. The passenger seat belt and occupant detection system according to claim 1, characterized in that, The pins of the CAN module are used for detecting the seat belt state and the sitting state of the passenger seat, one of the pins is triggered by using a normally closed switch, and the other pin is triggered by using a normally open switch; when the CAN module is powered on and the pins do not detect the closed switch, the CAN module considers that the passenger seat is not connected. The passenger seat belt and occupant detection system according to claim 2, characterized in that The CAN module is used for detecting the seat belt state of the passenger seat by using a normally closed switch, and is used for detecting the sitting state of the passenger seat by using a normally open switch. The passenger seat belt and occupant detection system according to claim 1, characterized in that, The CAN link has two CAN links, and is used for detecting the passenger seats on the left and right sides of the vehicle cabin. The passenger seat belt and occupant detection system according to claim 4, characterized in that For one side of the vehicle door, the pins of the CAN module are used for detecting the passenger seat, and the passenger seat detected by the CAN module is distinguished from being located in front of the vehicle door or behind the vehicle door by a specific pin being used for detecting the passenger seat or not being used for detecting the passenger seat. The passenger seat belt and occupant detection system according to claim 1, characterized in that, The CAN module further includes a CAN transceiver, and the CAN transceiver is a transceiver supporting PNM, and is used for implementing the wake-up and sleep management of the CAN module. A passenger car characterized by The CAN module includes a CAN transceiver, and the CAN transceiver is a transceiver supporting PNM, and is used for implementing the wake-up and sleep management of the CAN module. The passenger car according to claim 7, characterized in that The pins of the CAN module are used for detecting the seat belt state and the sitting state of the passenger seat, one of the pins is triggered by using a normally closed switch, and the other pin is triggered by using a normally open switch; when the CAN module is powered on and the pins do not detect the closed switch, the CAN module considers that the passenger seat is not connected. The passenger car according to claim 7, characterized in that The CAN module uses normally closed switch triggering when detecting the safety belt state of the passenger seat and uses normally open switch triggering when detecting the sitting state of the passenger seat. The passenger car according to claim 9, characterized in that The CAN link has two links, which are respectively used for detecting the passenger seats connected to the left and right sides of the car body. The passenger car according to claim 7, characterized in that For one side of the car door, when the pin of the CAN module detects the connection of the passenger seat, the CAN module distinguishes whether the passenger seat connected by the CAN module is located in front of the car door or behind the car door by detecting or not detecting the connection of the passenger seat through a specific pin. The passenger car according to claim 7, characterized in that The CAN module further comprises a CAN transceiver, which is a transceiver supporting PNM and is used for realizing the wake-up and sleep management of the CAN module.

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