KR101597357B1 - System for identical code addressing of LIN protocol vehicle sensors and method therefor - Google Patents

Abstract

The present invention relates to a system for assigning an identification code of a sensor for a vehicle using LIN communications and a method using the same, and more specifically, to a parking assistance system sensing an obstacle, an automatic parking system, a dead zone sensing system, a system for assigning an identification code of a sensor performing LIN communications with functions similar thereto which are installed on a specific location on a vehicle and a method using the same. To this end, the present invention can assign four identification codes via one ID input terminal and assign 4n (n = the number of ID input terminals) identification codes via a plurality of ID input terminals by using an analog to digital conversion terminal of an MCU or an ASIC of the sensor for the vehicle, wherein the sensor for the vehicle senses the obstacle or a specific signal to provide information using an LIN protocol, which is the communications protocol between the BCM or the ECU of the vehicle and vehicle components, and is provided with the ID input terminals. The present invention comprises: an input circuit unit including an analog to digital conversion input terminal of an MCU or an ASIC within the sensor for the vehicle and the ID input terminal for assigning the identification code to the sensor for the vehicle; a master unit composed of a body control module (BCM) or an electronic control unit (ECU) transferring an LIN signal via an LIN bus; and a connector unit assigning the identification code according to the LIN signal received from the ID terminal and the LIN bus which receive the output signal of the analog to digital conversion input terminal.

Description

[0001] The present invention relates to an identification code assignment system for a vehicle sensor using LIN communication,

The present invention relates to a system for assigning an identification code of a vehicle sensor using LIN communication and a method using the same, and more particularly, to a parking assisting system installed at a specific position of a vehicle for detecting an obstacle, an automatic parking system, And a method using the same. 2. Description of the Related Art

Generally, in a sensor communication using a LIN (Local Interconnect Network), which is a communication protocol for a vehicle, a plurality of sensors can be connected, so that a unique identification code is assigned to each sensor to enable correct communication.

The most commonly used method for assigning a unique identification code to a vehicle sensor is a method in which an identification code is given beforehand to each vehicle sensor in the manufacturing process of a vehicle sensor and then shipped. In this case, There is a problem that the product number needs to be managed separately as many as the number of products.

In order to solve such a problem, there is a method of automatically recognizing the order of connecting with the master (for example, BCM or ECU) based on the wiring of the vehicle in which the respective sensors for vehicles are installed to give an identification code. However, 1, a block diagram of a conventional method of assigning an identification code by a daisy chain connection scheme is as follows. In the daisy chain connection scheme, the LIN communication line is connected to the input and output terminals, Output, one terminal of the product is additionally consumed, and when the sensor close to the master is defective or malfunction, there is a problem in that all subsequent sensors can not communicate with each other.

In order to solve such a problem, as shown in FIG. 2, the identification code is given by the hard-wired system having the same structure as the switch input method using the wiring of the vehicle as shown in Patent Publication No. 10-2012-0018647. in order to identify the identification code of 2, and the need of an additional input terminal ID, the ID of Log ₂ N input terminals is needed to separate the N number of identification codes.

As an example, in a parking assist system installed in a vehicle and detecting an obstacle, generally four sensors are provided in the front and four sensors are provided in the rear, and eight identification codes are required. In the conventional system, three ID input terminals are required In actual products, it needs to be composed of 6 terminals with 2 DC power lines, 1 LIN communication line and 3 ID input terminals, and 4 identification codes are required even in front and rear distinguishing systems. It is generally incompatible with a conventional automatic identification code providing system composed of four terminals, and there is a problem that the product becomes unnecessarily large.

An object of the present invention is to provide a vehicular sensor having an ID input terminal for inputting an identification code to design an input circuit and automatically assigning at least four identification codes to one input terminal, The present invention provides an identification code assigning system for a vehicle sensor using LIN communication which can give a maximum identification code to each sensor with a minimum ID input terminal irrespective of the position of the sensor, and a method using the same.

An identification code assignment system for a vehicle sensor using LIN communication according to the present invention is a vehicle sensor for LIN communication used in a communication protocol for a vehicle. The vehicle sensor includes an analog-to-digital conversion input terminal of an MCU or an ASIC inside a vehicle sensor, An input circuit portion including an ID input terminal for assigning an identification code; A master unit configured by a vehicle body control module (BCM) or an electronic control unit (ECU) that transmits the LIN signal through the LIN bus; And an ID terminal for receiving an output signal of the analog digital conversion input terminal and a connector unit for giving an identification code according to a LIN signal received from the LIN BUS.

The method using the identification code assigning system of the vehicle sensor using the LIN communication including the input circuit unit, the master unit, and the connector unit includes (a) a master unit for outputting a V _AD output voltage of each vehicle sensor to the analog- And outputting the input voltage as an input voltage; (b) sensing the change in the input voltage for a predetermined period of time through the sensor; And (c) assigning an identification code of the sensor according to an input voltage change sensed by the connector unit through the sensor.

The identification code assignment system and method using the LIN communication of the present invention can automatically assign 4 ⁿ identification codes through ⁿ ID input terminals. Therefore, it is possible to automatically assign four identification codes to one input terminal and to use the existing identification code automatic assignment method, so that a product composed of four terminals can be used without changing the instrument mold and the connection terminal.

Second, since the number of external connection terminals is reduced, the overall size of the product is reduced, thereby minimizing the influence of peripheral interference upon mounting the vehicle, and can provide weight and weight reduction effect due to reduction in product size.

Third, reduction of product size and number of terminals reduces manufacturing cost of more than about 60 won per sensor due to reduction of raw materials of plastic injection, deletion of press metal terminal, reduction of soldering process and raw materials, process management cost and packaging cost. .

Fourthly, there has been a problem in that, in the manufacturing process of a vehicle sensor, a product identification number is assigned to a vehicle sensor in advance, and the product number is shipped separately as much as the number of sensors used in the system. However, It can be shared regardless of quantity.

Fifth, since the input and output of the communication line are not separated as in the case of the automatic identification code application of the existing Daisy chain type by the individual identification code granting method, even if one sensor fails, other sensors do not influence communication.

In addition, it is possible to implement the function by adding a simple passive element without the need for a complex dedicated circuit element or an active element such as an operational amplifier for implementing the function like the conventional automatic identification code providing method.

1 is a block diagram of a method of assigning an identification code by a conventional Daisy chain connection method,
2 is a block diagram of a method of assigning an identification code by a conventional hard-wired connection method,
3 is a block diagram of a method of assigning an identification code by a connection method used in the present invention;
FIG. 4 is a circuit diagram of an input circuit section composed of an analog-digital conversion input terminal of an MCU or ASIC in a vehicle sensor used in the present invention and a passive element receiving an ID signal,
FIG. 5 is a flowchart showing a method for carrying out an identification code for a vehicle in a master of a parking assist system for a vehicle according to an embodiment of the present invention;
FIG. 6 is an exemplary diagram showing a method for performing an identification code assignment for each vehicle sensor according to an embodiment of the present invention;
7 is an exemplary flowchart illustrating a method of using an identification code assigning system of a vehicle sensor using LIN communication according to the present invention.
8 is an exemplary view showing a step of assigning an identification code of a method using an identification code assigning system of a vehicle sensor using LIN communication of the present invention.

3 is an exemplary view showing an identification code assigning system of a vehicle sensor using the LIN communication of the present invention. As shown in this drawing, the input circuit unit 100, the connector unit 200, and the master unit 300 are included.

The input circuit unit 100 may include an analog-to-digital conversion input terminal of an MCU or ASIC in the vehicle sensor and an ID input terminal for providing an identification code to the vehicle sensor.

4, the input circuit unit 100 includes an ID input terminal 90, a first resistor R1 40 connected to the ID input terminal, an analog-to-digital conversion An MCU or ASIC including an input terminal 60, a used power supply (V_MCU) 30 of the MCU or ASIC, a second resistor R2 connected to the used power supply, a third resistor R3, and a reference voltage 80 coupled to the third resistor.

The connector unit 200 is configured to give an identification code according to an ID terminal receiving the output signal of the analog digital conversion input terminal and a LIN signal received from the LIN BUS. The connector unit 200 is connected to at least one sensor including a power connection terminal for connecting to a DC power source supplied from a vehicle, a LIN terminal connected to the LIN bus, an ID terminal for receiving an ID signal, and a GND terminal .

The connector section is characterized in that an identification code is assigned according to a predetermined condition of an output voltage (V _AD ) which is an output signal of the analog-digital conversion input terminal, and 4 ⁿ identification codes are given to ⁿ ID terminals.

The master unit 300 includes a vehicle body control module (BCM) or an electronic control unit (ECU) that transmits the LIN signal through the LIN bus.

Referring to FIG. 7, a method using an identification code assigning system for a vehicle sensor using LIN communication will be described.

7 is an exemplary diagram illustrating an overall flow chart of a method using an identification code assignment system of a vehicle sensor using LIN communication of the present invention.

A method using an identification code assigning system for a vehicle sensor using an LIN communication including an input circuit unit, a master unit, and a connector unit comprises the steps of: (a) a master unit for outputting a V _AD output voltage of each vehicle sensor through an analog- Outputting an input voltage; (b) sensing the change in the input voltage for a predetermined period of time through the sensor; And (c) assigning an identification code of the sensor according to an input voltage change sensed by the connector unit through the sensor.

In this case, before the step (a), the master unit sends a response request signal via LIN communication to any sensor connected through the connector unit, and performs a procedure from the arbitrary sensor to the next step in response.

8 is an exemplary view showing a step of assigning an identification code of a method using an identification code assigning system of a vehicle sensor using LIN communication of the present invention. As shown in this figure, step (c) includes the steps of: (c-1) assigning a first identification code when a change in the input voltage sensed through the sensor detects a change of 2V or less by 4V or more; (c-2) assigning a second identification code when the change in the input voltage is from 2V to 3V; (c-3) assigning a third identification code when the change in the input voltage is within 2V; And (c-4) applying a fourth identification code when the change in the input voltage is 4 V or more.

Hereinafter, the identification code assigning system of the vehicle sensor using the LIN communication of the present invention will be described.

The vehicle sensor of the vehicle identification system of the vehicle sensor using the LIN communication of the present invention includes a power connection terminal for connection to a DC power source supplied from a vehicle, a LIN terminal connected to the LIN BUS, an ID terminal for receiving the ID signal, And at least one sensor including a GND terminal.

FIG. 3 is a block diagram showing an example of a parking sensor provided in a specific position of a vehicle, which is a parking assist system for detecting an obstacle, an automatic parking system, a rectangular sensing system, and a vehicle sensor for performing LIN communication with similar functions Fig.

Referring to FIG. 3, in the master unit 300 and the four vehicle sensors constituted by the vehicle body control module (BCM) or the electronic control unit (ECU), each of the sensors includes a "sensor # 1" SENSOR # 2 "," No. 3 sensor "(SENSOR # 3), and" No. 4 sensor "(SENSOR # 4)

Each vehicle sensor includes an LIN terminal for being connected to the LIN bus 20 for connection to a DC power supplied from the vehicle or the master part 300, and an ID terminal 10 for receiving an ID signal. In the example, in order to simplify the drawing, the power source portion connected to the vehicle is omitted.

The "No. 1 sensor" constitutes a connection line to receive the LIN signal, and the "No. 2 sensor" constitutes a connection line. The "No. 3 sensor" constitutes a connection line between the 0V power source (GND) , "No. 4 sensor" constitutes the wiring so that it can be connected to the power supply line.

4 is a circuit diagram showing a passive element receiving an ID signal inside a vehicle sensor and an analog digital change input terminal of an MCU or AISIC for processing a signal.

4, an ID input terminal 90 for inputting an ID signal for automatically assigning an identification code, three resistive elements 40, a Zener diode 50, a signal processing of the sensor, and a result output (MCU) or a dedicated semiconductor device (ASIC) 70 and an analog-digital conversion input terminal 60 inside the MCU or ASIC.

Most ASICs or MCUs used in automotive sensors incorporate an analog-to-digital converter (ADC) device in the nature of a sensor that processes analog signals and outputs them. In the present invention, the ID signals are distinguished using the ASIC or MCU.

The V_MCU 30 is a power source for the MCU or the ASIC, and it is assumed that a DC voltage of 3.3 V or 5 V is generally used, but 5 V is used in the present embodiment.

In the system using 5V, the resistance elements R1, R2 and R3 can be designed to be 10 k ?, 47 k ?, 47 k ?, respectively. At this time, the voltage of the terminal AD_IN (60) Speaking of the voltage V_MCU (30) voltage to V2, the reference voltage 80 of V3, AD_IN (60) voltage V _AD of the terminal can be defined as the voltage at the terminal 90, and as V1 .

However, since the Zener diode 50 operates above the breakdown voltage characteristic of the device, it is assumed that the resistance inside the analog-to-digital converter is very large, neglecting the influence thereof.

Ohm's Law and Kirchhoff's Current Law (KCL) are substituted for the NODE equation, which can be defined as Equation 1,

[Equation 1]

At this time, since V3 = 0V and R2 = R3, it can be summarized as shown in Equation (2).

&Quot; (2) "

V2 = 5 V, R1 = 10 k ?, R2 = 47 k? Are substituted into Equation 2,

The "No. 1 sensor" is normally in the power supply voltage state, and when the LIN communication is started, it falls near the vehicle's 0V power supply (GND) by the break signal according to the LIN protocol, and then repeats up and down.

Since "V2" is in a floating state, only "ohm's law" is substituted for R2, and R2 is equal to R3, so that 2.5V state, which is half of V2 voltage 5V, is maintained.

Since "V1" is "0V" in "No. 3 sensor", 0.74V is maintained when it is substituted into equation (2).

Since "V1" is about 12V, "4th sensor" is calculated as 9.16V by substituting it into the equation (2), but the zener diode (50) operates and does not exceed the breakdown voltage of the zener diode. The zener diode specification maintains a 5V state using the same specifications as the V2 voltage.

In a real vehicle, the power of the vehicle must be able to cope with the 12V / 4V situation because the vehicle power using the 12V battery changes depending on the starting, stopping, or battery condition. Depending on the situation, it should be allowed up to + 1.6V. The LIN Physical Layer Specification defined in the LIN protocol defines this GND-Shift voltage as 10% of the battery supply voltage.

Considering this situation, Table 1 summarizes the V _AD voltage according to V1 input.

V1 state V _AD [V] 0V 0.74 1.6V 1.86 Not connected [floating] 2.5 4.7V 4 6.1V or more 5

Thus, the criteria of V _AD voltage as a function of V1 input "Low" is 2V or less "High" is decided to more than 4V refers to the value of the value 2V exceeds less than 3V therebetween as "Medium", and this sensor-specific V _AD according to state Are summarized in Table 2.

Sensor classification ID terminal connection V _AD state "No. 1 sensor" LIN High -> Low change "No. 2 sensor" Not connected [floating] Medium "No. 3 sensor" GND Low "Fourth Sensor" V_in High

At this time, in order to distinguish the "No. 1 sensor", the master unit 300 has to start the LIN communication, and only needs to send a response request signal of the "No. 1 sensor" as shown in FIG.

This can be used even in the case where the ECU or the BCM of the parking assist system for a vehicle acts as a master as in the embodiment of the present invention. However, even in a system where the sensor itself is a master unit, Application is possible.

According to Table 2 and FIG. 3, "No. 1 sensor" shown in FIG. 3 can allocate the identification code "1" if a change in the state on the V _AD is detected for a predetermined time

The "No. 2 sensor" can maintain a value of more than 2V but less than 3V, so that a "2"

"No. 3 sensor" can be assigned a value of "3"

"No. 4 sensor" can keep the value of 4V or more and assign "4" identification code.

Thus, a total of four identification codes can be assigned with one ID terminal, and as a result, 4n identification codes can be automatically assigned through ⁿ ID input terminals.

FIG. 6 is a flowchart showing a method for performing an identification code assignment in each of the vehicle sensors according to an embodiment of the present invention.

First, as shown in Fig. 5, the master unit sends a response request signal to "No. 1 sensor" or any sensor, and repeats until a correct response is received from the sensor. If there is no correct response for a certain period of time, error handling will be possible.

6, each vehicle sensor confirms the input voltage through the analog-to-digital converter incorporated in the sensor of the voltage of V _AD (S510)

Then, the connector unit senses the change for a predetermined time (eg, 5 ms) through the sensor, and gives a "1" identification code when detecting a significant change of 2 V or less and 4 V or more (S520, S560A).

Then, if there is no change, a value of "2" is assigned if the value is more than 2V but less than 3V (S530 and S560B). [

Then, if the value is 2 V or less, "3" identification code is given (S540, S560C)

Then, if the value is 4 V or more, "4" identification code is assigned (S550, S560D)

If any of the above conditions is not satisfied, repeat checking or error processing is performed. If one of the above conditions is satisfied, the identification code is ended and normally responded to the normal LIN communication and the request command for the master part Will be.

The identification code assignment system and method using the LIN communication of the present invention can automatically assign 4 ⁿ identification codes through ⁿ ID input terminals. Therefore, it is possible to automatically assign four identification codes to one input terminal and to use the existing identification code automatic assignment method, so that a product composed of four terminals can be used without changing the instrument mold and the connection terminal.

Second, since the number of external connection terminals is reduced, the overall size of the product is reduced, thereby minimizing the influence of peripheral interference upon mounting the vehicle, and can provide weight and weight reduction effect due to reduction in product size.

Third, reduction of product size and number of terminals reduces manufacturing cost of more than about 60 won per sensor due to reduction of raw materials of plastic injection, deletion of press metal terminal, reduction of soldering process and raw materials, process management cost and packaging cost. .

Fourthly, there has been a problem in that, in the manufacturing process of a vehicle sensor, a product identification number is assigned to a vehicle sensor in advance, and the product number is shipped separately as much as the number of sensors used in the system. However, It can be shared regardless of quantity.

Fifth, since the input and output of the communication line are not separated as in the case of the automatic identification code application of the existing Daisy chain type by the individual identification code granting method, even if one sensor fails, other sensors do not influence communication.

In addition, it is possible to implement the function by adding a simple passive element without the need for a complex dedicated circuit element or an active element such as an operational amplifier for implementing the function like the conventional automatic identification code providing method.

As described above, the vehicle parking assist system of the present invention can solve the problem that all the other sensors can not communicate with each other in case of failure of one sensor, which is a disadvantage of the existing Daisy chain connection method. The existing hard- The need for a large number of input terminals makes it incompatible with the conventional automatic identification code providing system, and it is possible to solve a hard problem due to an increase in the number of terminals of the product.

100: input circuit section 200:
300: master part
10: ID terminal 20: LIN BUS
30: V_MCU 40: Resistor elements (R1, R2, R3)
50: Zener diode 60: AD_IN terminal
70: MCU or ASIC 80: Analog digital conversion input terminal
90: ID input terminal

Claims (8)

An input circuit part including an analog digital conversion input terminal of an MCU or an ASIC inside the vehicle sensor and an ID input terminal for providing an identification code to the vehicle sensor;
A master unit configured by a vehicle body control module (BCM) or an electronic control unit (ECU) that transmits the LIN signal through the LIN bus; And
And a connector unit for assigning an identification code according to an LIN signal received from an LIN bus and an ID terminal receiving an output signal of the analog digital conversion input terminal,
The input circuit unit includes an ID input terminal, a first resistor (R1) connected to the ID input terminal, an MCU or an ASIC including an analog-digital conversion input terminal connected to the first resistor, a power source (V_MCU ), A second resistor (R2) connected to the power source, a third resistor (R3) connected to the second resistor, and a reference voltage connected to the third resistor. Identification code assignment system for vehicle sensors. The method according to claim 1,
The connector unit,
A LIN terminal connected to the LIN bus, an ID terminal for receiving the ID signal, and a GND terminal, and is connected to at least one sensor. Identification code assignment system of the vehicle sensor used. delete The method according to claim 1,
Wherein the connector unit is provided with an identification code according to a predetermined condition of an output voltage (V _AD ) which is an output signal of the analog-digital conversion input terminal. The method according to claim 1 or 4,
Wherein the connector unit is provided with 4 ID codes by ⁿ ID terminals. ≪ RTI ID = 0.0 > 11. < / RTI &^gt; A method using an identification code assigning system for a vehicle sensor using LIN communication including an input circuit section, a master section, and a connector section,
(a) the master unit outputting the V _AD output voltage of each vehicle sensor as an input voltage through the analog-digital conversion terminal of the input circuit unit;
(b) sensing the change in the input voltage for a predetermined period of time through the sensor; And
(c) assigning an identification code of the sensor according to an input voltage change sensed by the connector unit through the sensor,
Sending a response request signal via the LIN communication to any sensor connected via the connector portion of the master unit before the step (a), and performing the procedure from the arbitrary sensor to the next step in response An identification code assignment method for a vehicle sensor using LIN communication. delete The method according to claim 6,
The step (c)
(c-1) assigning a first identification code when a change in the input voltage sensed through the sensor detects a change of 2V or less or 4V or more;
(c-2) assigning a second identification code when the change in the input voltage is from 2V to 3V;
(c-3) assigning a third identification code when the change in the input voltage is within 2V; And
(c-4) assigning a fourth identification code when the change in the input voltage is equal to or greater than 4V.

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