KR20160044832A - Sensor module for a vehicle and method for assigning sensor id using the system - Google Patents

Abstract

Disclosed is a sensor system for a vehicle, which can reduce complexity of a PCB circuit and a unit cost increase. The sensor system for a vehicle comprises a master node, and a plurality of slave nodes to receive LIN data from the master node. The slave nodes are dependently connected to each other. Each slave node measures a baud rate of the LIN data received from a preceding slave node and recognizes the measured baud rate as a sensor ID of the slave node.

Description

TECHNICAL FIELD [0001] The present invention relates to a vehicle sensor system and a sensor ID allocation method using the sensor system.

The present invention relates to a vehicle sensor system and a sensor ID allocation method using the same, and more particularly, to a vehicle sensor system for assigning a sensor ID to a plurality of sensor modules included in a vehicle sensor system, .

In general, the parking assist system includes a plurality of sensor modules 10, 20, 30, and 40 and a body controlling module (BCM)

Each of the sensor units 10, 20, 30, and 40 is assigned a sensor ID, and when power is applied to each sensor unit. The sensor IDs assigned to the respective sensor units 10, 20, 30, and 40 are assigned to the potential levels appearing on the respective LID pins.

When assigning a sensor ID to eight sensor modules, three LID pins are designed for each sensor module. When each pin is called LID 1, LID 2 and LID 3, each sensor module calls the BCM 50 according to the potential state (Open [NC], Ground) appearing on its LID 1 ~ Signal).

When the BCM 50 calls a sensor module at a corresponding location through LIN (Local Interconnect Network) communication, the corresponding sensor module responds thereto.

The RL, RR, RCL, and RCR sequences (operation sequence) when the BCM 50 is called in the order of RL, RR, RCL, and RCR according to the positions of the sensor modules 10, 20, .

Table 1 below shows the types of pins provided in each sensor unit when 8 sensor modules are assigned sensor IDs. Table 2 shows the states of LID 1 ~ 3 pins defined by the position of the sensor module.

Pin number Description One LIN 2 LID1 3 LID2 4 GND 5 LID3 6 Vbat

Sensor location LID3 LID2 LID1 RL N.C N.C N.C RCL N.C GND N.C RLR N.C N.C GND RR N.C GND GND

Assuming that the sensor ID is assigned to the eight sensor modules, each sensor module of the related art includes three additional LID pins (not shown) in addition to the three pins of the power pin Vbat, the ground pin GND and the LIN pin LIN (LID 1, LID 2, LID 3) are further designed.

Passive elements such as resistors and switching diodes are added to the peripheral circuits of the LID pins to recognize the high and low potential levels of the LID pins LID 1, LID 2 and LID 3. Therefore, the area occupied by the connector portion of each sensor module is increased, which leads to an increase in the complexity and cost of the PCB circuit.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle sensor system and a sensor ID allocation method using the same that can reduce the complexity and cost increase of a PCB circuit.

According to an aspect of the present invention, there is provided a vehicle sensor system including a master node and a plurality of slave nodes receiving LIN data from the master node, the plurality of slave nodes being connected to each other Each slave node measures the transmission rate value of the LIN data received from the slave node of the previous stage and recognizes the measured transmission rate value as its own sensor ID.

According to another aspect of the present invention, a vehicle sensor system includes a master node and a plurality of slave nodes receiving LIN data from the master node, Each slave node has an input LIN port and an output LIN port and receives the LIN data transmitted from the output LIN port of the slave node of the previous stage through the input LIN port and receives the transmission rate value (Baund Rate) is measured and the measured Baud Rate is recognized as its own sensor ID.

A sensor system for a vehicle according to another aspect of the present invention includes: receiving LIN data transmitted from a master node through a slave node of a previous stage in a slave node of a current stage; Measuring a transmission rate value of the received LIN data, and allocating a sensor ID using the measured transmission rate value at the slave node of the current stage.

According to the present invention, by assigning the sensor IDs of the respective sensor modules using the transmission rate (Baud Rate) of the LIN data, in the allocation of the sensor IDs, each sensor module has a dedicated port 1 LID pin) design can be excluded. Therefore, the area of the connector portion of each sensor module related to the dedicated port can be reduced, and the complexity and the unit cost of the PCB circuit can be reduced.

1 is a block diagram showing a LIN communication connection structure between a vehicle body control module and a plurality of sensor modules in a conventional parking assist system.
2 is a block diagram illustrating a connection structure between a plurality of sensor modules included in a vehicle sensor system according to an embodiment of the present invention.
3 is a block diagram showing the internal configuration of each sensor module shown in FIG.
4 is a flowchart illustrating a method of assigning a sensor ID according to an embodiment of the present invention.

The present invention provides a method of allocating a sensor ID of each sensor module using a transmission rate (Baud Rate) of LIN data. As will be described in detail in the following embodiments, each sensor module connected to each other via the LIN signal line measures its own sensor ID by measuring the data transmission rate (Baud rate) of input LIN data to be input.

The sensor module recognizing its sensor ID increases the data transmission rate (Baud Rate) measured in the previous stage and transmits it to the next sensor module. Then, the next sensor module recognizes the increased data transmission rate in the previous stage as its own sensor ID.

According to the sensor ID allocation method, in the present invention, sensor IDs can be assigned without requiring a separate dedicated port (LID pin in FIG. 1) for each sensor module to recognize its own sensor ID.

According to the present invention, parts such as connectors and cables can be reduced by not using a dedicated port for ID recognition.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the detailed description, the embodiments described below are limited to the sensor modules used in the Parking Assistance system (PAS). However, this is only for describing the embodiment of the present invention, but it does not mean that the sensor module of the present invention can be applied only to the PAS system.

Therefore, it will be understood by those skilled in the art that the present invention can be applied to all kinds of systems having a sensor module to which a sensor ID is assigned in a vehicle.

2 is a block diagram illustrating a connection structure between a plurality of sensor modules included in a vehicle sensor system according to an embodiment of the present invention.

2, a vehicle sensor system 100 according to an embodiment of the present invention includes n + 1 sensor modules (Module 0, Module 1, and Module 2) connected in series (or dependently) ~ Module n), where n is a natural number.

Each of the sensor modules (Module 0, Module 1, Module 2 to Module n) according to the embodiment of the present invention has six LID pins 1 to 3 in the six PIN schemes including Vsup, GND, LIN, LID1, LID2, The number of pins is reduced by the four PIN method consisting of removed Vsup, GND, LIN_IN, and LIN_OUT.

Each of the sensor modules (Module 0, Module 1, Module 2 to Module n) includes two LIN ports (LIN_IN and LIN_OUT), a power port (V), and a ground port (G). Here, it should be noted that the LID pin is not designed for each of the sensor modules (Module 0, Module 1, Module 2 to Module n) according to the embodiment of the present invention.

The two LIN ports (LIN_IN, LIN_OUT) consist of an input LIN port (LIN_IN) and an output LIN port (LIN_OUT).

The input LIN port (LIN_IN 0) of the sensor module (Module 0) of the first stage is communicatively coupled to the LIN signal line with the BCM (not shown), and the output LIN port (LIN_OUT 0) And is electrically connected to the input LIN port (LIN_IN 1).

The output LIN port (LIN_OUT 1) of the sensor module (Module 1) of the second stage is connected to the input LIN port (LIN_IN 2) of the sensor module (Module 1) of the third stage. Similarly, a connection between the remaining sensor modules is configured.

The power port V of each of the sensor modules (Module 0, Module 1, Module 2 to Module n) is commonly connected to the power source, and the ground port G is commonly connected to the ground.

3 is a block diagram showing the internal configuration of each sensor module shown in FIG.

Referring to FIG. 3, each sensor module includes a first MUX 110, a Baud Rate Measurement unit 112, a Baud Rate Increase unit 114, a second Mux 110, 116, a LIN transceiver 118, and a controller 120 (MCU).

In the LIN communication mode for ID assignment, the first mux 110 selectively activates the first port to forward the input LIN data input through the input LIN port LIN_IN to the speed measurement unit 112, In the communication mode, the port 0 is selectively activated to be transmitted to the LIN transceiver 118 through input LIN data. Here, the normal LIN communication mode can be defined as a general LIN communication mode between the BCM and the sensor module, which is performed after the LIN communication mode for ID allocation is terminated.

The speed measuring unit 112 measures a data transmission speed value (or a data reception speed value) of the input LIN data currently input through the LIN line (in the case of the first-stage sensor module) or an input LIN The data transmission rate value (or the data reception rate value) of the data is measured. The measured data transmission rate value is transmitted to the controller 120 and simultaneously transmitted to the speed value increasing unit 114.

The controller 120 allocates a sensor ID based on the received data transmission rate value, and the speed value increasing unit 114 increases the received data transmission rate value and transmits the increased data transmission rate value to the second mux Lt; / RTI >

The second MUX 116 selectively activates the first port and the 0th port. When the first port is activated, the second MUX 116 transmits the increased data transmission from the speed value increasing unit 114 through the activated first port Receives the speed value and transfers it to the input port (LIN_IN) of the next stage sensor module.

Hereinafter, a method of allocating IDs by measuring and increasing the data transmission rate value according to an embodiment of the present invention will be described with reference to Table 3. [

Measured Baud Rate Assigned ID
(Assigned ID) Increased data rate value
(Increased Baud Rate) 2400 ID0 4800 4800 ID1 9600 9600 ID2 19200 19200 ID3 20000 20000 ID4 28800 28800 ID5 38400 38400 ID6 48000 48000 ID7 57600 57600 ID8 115200

The number of ID assignments may be further increased or limited depending on the baud rate setting range according to the Main Clock Frequency of the controller 120. [ For example, if the baud rate of the input LIN data received by the first sensor module (Module 0) is 2400, the sensor module 0 assigns the self ID to 0 by referring to the table as shown in Table 1 , And the input LIN data is transmitted to the sensor module (Module 0) of the second stage by changing the baud rate of the input LIN data to 4800. That is, the sensor ID of each sensor module is defined in advance in the table as shown in Table 1 according to the measured baud rate rate.

4 is a flowchart illustrating a method of assigning a sensor ID according to an embodiment of the present invention. In order to facilitate the understanding of the description, FIG. 4 shows a process performed in the vehicle body control module (BCM) as a master node and a process performed in each sensor module performed in the slave node Are shown together.

Referring to FIG. 4, when all the sensor modules (Module 0, Module 1, Module 2 to Module n) corresponding to the slave node receive the power supply Vsup and start operation, first, (Activated) by the port 1 of the terminal 110 to prepare for sensor ID recognition (S412). When the preparation is completed, the vehicle body control module, which is a master node, starts transmission of input LIN data for ID assignment at a predetermined transmission rate value (S414).

Then, the transmission speed value (Baund Rate) of the transmitted input LIN data is measured in the first-stage sensor module (Module 0) (S416), and the measured transmission rate is mapped to the measured transmission rate And assigns the sensor ID to its own sensor ID (S418). At the same time, the measured transmission rate value is increased at a predefined rate (S420).

Then, the first sensor module (Module 0) transmits the increased transmission rate value to the next sensor module (Module 1) (S422). In order to prepare the normal mode LIN communication, the first and second The port of the muxes 110 and 116 is changed to the port 0 (S424).

In step S426, the sensor module having received the sensor ID assignment transmits a sensor response indicating that the ID assignment is completed to the vehicle body control module, which is the master node, and the vehicle body control module checks whether sensor responses are received from all the sensor modules.

When receiving the sensor response from all the sensor modules (S428), the ID allocation completion message is transmitted to all the sensor modules (S430), and the normal mode LIN communication is started between the sensor modules and the vehicle body control module (S434) .

If the sensor module to which the sensor response is not received is confirmed (S428), the ID allocation is restarted again.

The sensor module which failed ID assignment confirms whether or not the ID assignment completion message is received for a predetermined time t (S432). If the sensor module confirms reception of the ID assignment completion message, the sensor module starts the general LIN communication for sensing operation (S434). If it is not received, the system automatically returns to the start after the predetermined time (t) and attempts ID allocation again.

As described above, according to the present invention, by recognizing the sensor ID of each sensor module through the change of the LIN data transmission rate (Baud Rate), it is possible to assign the ID of the sensor module without a dedicated port (LID pin) . By not using a dedicated port for ID recognition through the present invention, parts such as a connector and a cable can be reduced.

As described above, the configuration of the vehicle head unit according to the present invention and the method of setting a screen in the head unit for a vehicle according to the present invention are not limited to the configuration and method of the embodiments described above, All or some of the embodiments may be selectively combined.

Claims (10)

1. A vehicle sensor system including a master node and a plurality of slave nodes receiving LIN data from the master node,
Wherein the plurality of slave nodes are connected to each other,
Each slave node,
And measures the transmission rate value of the LIN data received from the slave node of the previous stage and recognizes the measured transmission rate value as its own sensor ID.
2. The method of claim 1, wherein each of the slave nodes comprises:
Increases the measured transmission rate value at a predefined rate, and transmits the incremented transmission rate value to the next slave node,
The slave node of the next stage,
And recognizes the increased transmission rate value as its own sensor ID.
3. The method according to claim 2,
Refers to the table, recognizes its own sensor ID,
The table includes:
And stores the increased transmission rate value and a sensor ID mapped to the increased transmission rate value.
1. A vehicle sensor system including a master node and a plurality of slave nodes receiving LIN data from the master node,
Each slave node,
An input LIN port and an output LIN port,
The LIN data transmitted from the output LIN port of the slave node of the previous stage is input through the input LIN port and the measured transmission rate value (Baund Rate) of the received LIN data is measured, Is recognized as its own sensor ID.
5. The method of claim 4, wherein each of the slave nodes comprises:
Increases the measured transmission rate value by a predetermined ratio, passes the increased transmission rate value through the output LIN port to the input LIN port of the next-stage slave node,
The slave node of the next stage,
And recognizes the increased transmission rate value as its own sensor ID.
5. The method of claim 4, wherein each of the slave nodes comprises:
A Baud Rate Measurement Unit for receiving the LIN data through the input LIN port and measuring a transmission rate value of the transferred LIN data;
A controller for recognizing the sensor ID using the measured transmission rate value; And
A Baud Rate Increase unit for increasing the measured transmission rate value at a predefined rate and transmitting the increased transmission rate value to the input LIN of the next slave node through the output LIN port,
And a sensor for detecting the vehicle.
7. The apparatus of claim 6,
By referring to the table, the sensor ID is recognized,
The table includes:
And stores a plurality of sensor IDs respectively mapped to the transmission rate value and the increased transmission rate value.
A method for assigning a sensor ID to each slave node in a sensor system for a vehicle including a master node and a plurality of slave nodes receiving LIN data transmitted from the master node,
Receiving LIN data transmitted from the master node through a slave node of a previous stage in a slave node of the current stage;
Measuring a transmission rate value (Baund Rate) of the received LIN data at a slave node of the current stage; And
Allocating a sensor ID using the measured transmission rate value at a slave node of the current stage;
Wherein the sensor ID is assigned to the sensor node.
9. The method of claim 8, further comprising: increasing the measured transmission rate value at a predefined rate;
Transferring the increased transmission rate value to a next slave node; And
In the next slave node, allocating a sensor ID using the increased transmission rate value
Further comprising the steps of: (a) receiving the sensor ID from the vehicle sensor system;
The method as claimed in claim 9, further comprising, in each slave node, constructing a table storing a sensor ID mapped to the transmission rate value and the increased transmission rate value,
In the slave node of the current stage, the step of allocating the sensor ID using the measured transmission rate value may include:
Allocating the sensor ID mapped to the transmission rate value with reference to the table,
In the next slave node, allocating the sensor ID using the increased transmission rate value may include:
And allocating the sensor ID mapped to the increased transmission rate value with reference to the table.

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