KR102471007B1 - In-vehicle controller and method for controlling the same - Google Patents

Abstract

The present invention relates to a vehicle controller capable of efficiently responding to network errors that may occur in a vehicle and a control method thereof. A vehicle controller communicating with at least one other controller through a first line and a second line according to an embodiment of the present invention includes a microcontroller; And a transceiver connected to the microcontroller, wherein the microcontroller measures the voltage of each of the first line and the second line at the output side of the transceiver, and the line whose measured voltage satisfies a preset condition is If there is, the first signal corresponding to the line satisfying the preset condition is transmitted to the transceiver, and the transceiver excludes the line corresponding to the first signal from among the first line and the second line from the differential determination. can make it

Description

Vehicle controller and its control method {IN-VEHICLE CONTROLLER AND METHOD FOR CONTROLLING THE SAME}

The present invention relates to a vehicle controller capable of efficiently responding to network errors that may occur in a vehicle and a control method thereof.

Recently, electronic equipment systems mounted in vehicles tend to increase day by day, and their complexity is also increasing. As the number of controllers increases, the number of inputs/outputs also increases significantly. In the past, many communication wires were used for input/output between controllers at a distance, but there were limitations in cost, space, and weight increase due to the increase in physical wires as complexity increased. Therefore, what has been introduced is a wired communication interface such as CAN (Controller Area Network).

The CAN communication method is a method in which each controller is connected in parallel with two wires (CAN LOW, CAN HIGH) and exchanges data through a predetermined CAN protocol (data transmission method, data transmission rate, priority, etc.). Because a lot of information can be exchanged between controllers with just two wires, the CAN communication method is a method that dramatically improves vehicle systems.

The CAN (Controller Area Network) protocol constituting the backbone network of the vehicle network is implemented by the CAN controller 120 and the CAN transceiver.

Referring to FIG. 1 , the CAN protocol includes a CAN controller 120 and a CAN transceiver 130 . In addition, the CAN protocol is connected to a microcomputer (hereinafter referred to as an MCU; 110). The CAN controller 120 has an internal buffer and transfers the received message transmitted from the transceiver to the MCU 110 for determining whether or not valid data is valid. In the case of a transmission message, data to be transmitted from the MCU 110 is transmitted to the CAN transceiver.

The CAN transceiver 130 converts transmission/reception data transmitted from the CAN bus or MCU 110 into an electrical signal. The CAN transceiver 130 converts data transferred from the MCU 110 into CAN communication data, and converts CAN communication data transferred from the CAN bus into MCU 110 transmission/reception data.

However, the CAN communication method has a problem called CAN FREEZING. This problem is caused by the fact that the CAN communication method has transmission priority. More specifically, in the CAN communication method, ① other controllers must maintain a listening state until the task of the controller to send a message with a high priority is completed, and ② when the message is sent from the corresponding controller, each controller returns to each other. After comparing the priority of the messages, the process of sending data is repeated.

A problem arises when one of the numerous controllers connected in parallel transitions to a malfunction state. Here, the failure state of the controller is a situation in which the operation of the controller cannot be predicted, and may include aging of a semiconductor, data loss due to external surge, data conversion due to light particles, and the like.

For example, it is a situation where the CAN HIGH line is stuck to ground. In this situation, since the HIGH line always indicates 0, it can always take the highest priority, so the controller where can freezing has occurred occupies the CAN bus, the data area is also written as 0, and the CRC CHECK SUM is also sent as 0. can happen As another example, can freezing may also occur when "STUCK AT 0 FAULT" occurs due to deformation in the CAN transceiver IC and the CAN_L line is connected to GND. To prepare for this problem, in the low-speed CAN protocol, as part of fault tolerance, communication is possible using the voltage difference between the two lines even if a disconnection or a short circuit with ground/B+ power occurs in one line. let it do However, when a contact failure such as an intermittent short continuously occurs in any one line, there is a problem in that normal communication is impossible due to communication occupancy of an error frame.

A normal situation and a problem situation in a vehicle to which such CAN communication is applied will be described as an example of light control. 2 is a diagram for explaining an example of a form and problem situation in which light control using general CAN communication is performed.

Referring to FIG. 2 , the upper part represents a normal operating situation and the lower part represents a problem situation. First of all, a normal operating situation will be described. When the driver manipulates the switch (SW) in the vehicle to turn on the head lamp (H/Lamp), the body control module (BCM) determines that the head lamp (H/Lamp) lighting condition is satisfied. It determines that it is, and transmits a lighting command to the smart junction box (SJB) connected through CAN communication. Accordingly, the smart junction box (SJB) turns on the head lamp (H/Lamp).

On the other hand, in the case of a problem situation, if the CAN_H line between the body control module (BCM) and the smart junction box (SJB) is shorted to ground (GND) due to poor contact and then disconnected continuously, an error frame is displayed over the CAN communication line. occupied, making normal communication impossible. Therefore, the smart junction box (SJB) determines that the turn-on command is timed out and turns off the headlamps. When the CAN_H line is normalized again, the headlamps are turned on. Therefore, a flickering phenomenon of the head lamp may occur.

In this way, when can freezing occurs, not only is all data exchanged between numerous controllers in units of several milliseconds (ms) useless, but also normal controllers operate by referring to incorrect data, so it is difficult to understand what happens at the vehicle level. It is difficult to predict what will happen, and in severe cases, there is a problem of falling into a state of complete loss of function.

An object of the present invention is to provide a vehicle controller capable of coping with CAN communication failures and a control method thereof.

In particular, the present invention is to provide a controller capable of ensuring normal operation in an intermittent short circuit situation, a communication system including the same, and a control method thereof.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below. You will be able to.

In order to solve the above problem, a control method of a vehicle controller communicating with at least one other controller through a first line and a second line according to an embodiment of the present invention includes the microcontroller in the microcontroller of the controller. Measuring a voltage of each of the first line and the second line of the output terminal side of the transceiver connected to; determining whether there is a line whose measured voltage satisfies a preset condition in the microcontroller; transmitting a first signal corresponding to a line satisfying the predetermined condition from the microcontroller to the transceiver; and excluding, in the transceiver, a line corresponding to the first signal among the first line and the second line from differential determination.

In addition, a vehicle controller communicating with at least one other controller through a first line and a second line according to an embodiment of the present invention includes a microcontroller; And a transceiver connected to the microcontroller, wherein the microcontroller measures the voltage of each of the first line and the second line at the output side of the transceiver, and the line whose measured voltage satisfies a preset condition is If there is, the first signal corresponding to the line satisfying the preset condition is transmitted to the transceiver, and the transceiver excludes the line corresponding to the first signal from among the first line and the second line from the differential determination. can make it

According to at least one embodiment of the present invention, there are the following effects.

It detects whether an intermittent short circuit occurs in the communication line, and if a short circuit occurs, the corresponding line is excluded from the differential determination, so normal communication is possible.

In addition, stability of the entire network can be guaranteed because the information on the line where the short circuit is detected is transmitted to another controller that shares the CAN bus.

The effects that can be obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description below. will be.

1 is a simple implementation of the CAN protocol.
2 is a diagram for explaining an example of a form and problem situation in which light control using general CAN communication is performed.
3 shows an example of a controller and a network type including the controller according to an embodiment of the present invention.
4 is a flowchart illustrating an example of an operation process of a main controller according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in this specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are given the same reference numerals regardless of reference numerals, and redundant description thereof will be omitted. The suffixes "module" and "unit" for components used in the following description are given or used together in consideration of ease of writing the specification, and do not have meanings or roles that are distinct from each other by themselves.

In addition, in describing the embodiments disclosed in this specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in this specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in this specification, the technical idea disclosed in this specification is not limited by the accompanying drawings, and all changes included in the spirit and technical scope of the present invention , it should be understood to include equivalents or substitutes.

According to an embodiment of the present invention, any one of the controllers constituting the vehicle network determines whether an intermittent short occurs in a CAN communication line, and when a line with an intermittent short is detected, the corresponding line determines the differential. We propose to exclude

A configuration of a controller for this purpose and a network configuration including the controller will be described with reference to FIG. 3 .

3 shows an example of a controller and a network type including the controller according to an embodiment of the present invention.

Referring to FIG. 3 , the vehicle network may include a controller 200 that detects whether an intermittent short has occurred and at least one other controller 331 to 337 according to the present embodiment. Hereinafter, for convenience of description, the controller 200 that detects whether or not an intermittent short occurs is referred to as a “main controller”. It is assumed that the main controller 200 and the other controllers 331 to 337 share one CAN bus consisting of a CAN_H line and a CAN_L line. The number or relative positions of the other controllers 331 to 337 in FIG. 3 is exemplary, and a vehicle network may be configured with more or fewer controllers. In addition, it is assumed that the main controller 200 and the other controllers 331 to 337 operate in a dual mode using both the CAN_H line and the CAN_L line in a normal communication situation.

The main controller 200 includes at least a microcontroller (MCU) 210 and a CAN transceiver 230. The microcontroller 210 is electrically connected to the CAN_H line and the CAN_L line of the network direction output terminal of the CAN transceiver 230, in addition to the connection (Rx/Tx) with the general CAN transceiver 230. Accordingly, the microcontroller 210 may monitor the voltages of the CAN_H line and the CAN_L line, respectively, and determine whether an intermittent B+ 310 short circuit or a ground 320 short circuit occurs according to the monitoring result.

Specifically, the microcontroller 210 may determine that an intermittent short has occurred if a situation in which the normal voltage range switching is restored after maintaining the voltage at the same level for a predetermined period of time in a certain line is repeated a preset number of times. For example, after maintaining the same voltage level (0V, 12V, or 5V, etc.) for more than 5 bit time (50us, 1 bit time = 10us), the return to normal voltage range (0V to 5V) switching is repeated for 5 cycles. The microcontroller 210 may determine that an intermittent short has occurred.

In a situation determined to be the above-described intermittent short, an error frame starts to occur in the communication line due to differential detection of the CAN transceiver 230 due to an instantaneous voltage change. When it is determined that an intermittent short has occurred, the microcontroller 210 can transmit a fault signal to the CAN transceiver 230 for a line for which it is determined that an intermittent short has occurred. The CAN transceiver 230 may immediately exclude the line corresponding to the fault signal from differential determination. Accordingly, normal communication can be performed by immediately switching to single line communication using only lines in which intermittent shorts do not occur.

In addition, the main controller 200 may transmit failure information to the other controllers 331 to 337 when detecting an intermittent short. In other controllers, normal communication may be difficult due to intermittent short circuits, but because it is an intermittent short circuit rather than a continuous short circuit, fault information can be normally received at the time when the short state is released. Accordingly, the other controllers 331 to 337 can immediately exclude the line where the CAN transceiver has a short circuit from determining the differential based on the failure information transmitted by the main controller 200 . Accordingly, since all controllers receiving failure information from the corresponding network switch to single-line communication, the entire network can be freed from problems caused by intermittent short circuits.

Meanwhile, each controller may enter the sleep mode when conditions for entering the sleep mode are satisfied after single-line communication, and may perform a normal operation (ie, dual mode) again upon waking up from the sleep mode. Of course, if the intermittent short is detected again after waking up, the main controller may repeat the above-described process so that single-line communication is performed again in the network.

The operation of the main controller described above will be described in a flowchart as shown in FIG. 4 .

4 is a flowchart illustrating an example of an operation process of a main controller according to an embodiment of the present invention.

Referring to FIG. 4 , the main controller operates in dual mode in a normal situation (S410) and can detect whether an intermittent short has occurred in any one CAN line (S420). When an intermittent short occurs, the main controller may switch to a single communication mode (S430). At this time, the main controller may transfer the failure information to other controllers in the network. If a preset sleep mode conversion condition is satisfied during single mode communication, the main controller transitions to the sleep mode (S440), and can perform normal communication again upon wake-up (S410).

According to the above-described embodiment, the following effects can be expected.

The weakness of the fault tolerance function of general low-speed CAN communication can be supplemented. That is, communication in a state where any one line is disconnected or shorted can be processed based on the differential, but the situation in which error frames due to intermittent shorts cannot be coped with can be resolved.

The above-described present invention can be implemented as computer readable code on a medium on which a program is recorded. The computer-readable medium includes all types of recording devices in which data that can be read by a computer system is stored. Examples of computer-readable media include Hard Disk Drive (HDD), Solid State Disk (SSD), Silicon Disk Drive (SDD), ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, etc. there is

Accordingly, the above detailed description should not be construed as limiting in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (19)

A control method of a vehicle controller communicating with at least one other controller through a first line and a second line,
measuring a voltage of each of the first line and the second line at an output terminal side of a transceiver connected to the microcontroller in a microcontroller of the controller;
determining whether there is a line whose measured voltage satisfies a preset condition in the microcontroller;
transmitting a first signal corresponding to a line satisfying the predetermined condition from the microcontroller to the transceiver; and
In the transceiver, a line corresponding to the first signal among the first line and the second line is excluded from differential determination for communication using a voltage difference between the first line and the second line, and the Performing single-line communication using a line other than a line excluded from the differential determination among the first line and the second line,
The preset condition is,
The control method of a vehicle controller, which is satisfied when a situation in which the measured voltage is switched to the normal range after maintaining the same level for a predetermined time or longer occurs more than a predetermined number of times. According to claim 1,
The determining step is
and determining whether an intermittent short occurs in the first line or the second line based on the measured voltage in the microcontroller. According to claim 2,
The intermittent short,
A control method of a vehicle controller comprising a ground short or B+ power supply short of the first line or the second line. delete delete According to claim 1,
After the first signal is transmitted to the transceiver, the method further comprises transmitting a second signal including failure information corresponding to the first signal to the at least one other controller. According to claim 1,
The microcontroller,
When the preset sleep mode entry condition is satisfied, transition to the sleep mode,
A control method of a controller for a vehicle, wherein the transceiver is reset upon wakeup. According to claim 7,
The transceiver,
A control method of a vehicle controller operating in a dual mode using both the first line and the second line after the reset. According to claim 1,
The transceiver,
a controller area network (CAN) transceiver;
The first line includes a CAN_H line,
The second line includes a CAN_L line, the control method of the vehicle controller. A computer readable recording medium recording a program for executing the control method of a vehicle controller according to any one of claims 1 to 3 and 6 to 9. A vehicle controller communicating with at least one other controller through a first line and a second line,
microcontroller; and
Including a transceiver connected to the microcontroller,
The microcontroller,
The voltage of each of the first line and the second line at the output side of the transceiver is measured, and when there is a line whose measured voltage satisfies a preset condition, a line corresponding to the line satisfying the preset condition 1 transmit a signal to the transceiver;
The transceiver,
A line corresponding to the first signal among the first line and the second line is excluded from differential determination for communication using a voltage difference between the first line and the second line, and Performing single-line communication using a line other than a line excluded from the differential determination among the second lines;
The controller for a vehicle, which is satisfied when a situation in which the measured voltage is switched to the normal range after maintaining the same level for a predetermined time or longer occurs more than a predetermined number of times. According to claim 11,
The microcontroller,
A vehicle controller for determining whether an intermittent short occurs in the first line or the second line based on the measured voltage. According to claim 12,
The intermittent short,
A vehicle controller comprising a ground short or a B+ power supply short of the first line or the second line. delete delete According to claim 11,
The microcontroller,
After transmitting the first signal to the transceiver, the vehicle controller controls transmission of a second signal including failure information corresponding to the first signal to the at least one other controller. According to claim 11,
The microcontroller,
When the preset sleep mode entry condition is satisfied, transition to the sleep mode,
A vehicle controller that resets the transceiver upon wakeup. According to claim 17,
The transceiver,
A vehicle controller operating in a dual mode using both the first line and the second line after the reset. According to claim 11,
The transceiver,
a controller area network (CAN) transceiver;
The first line includes a CAN_H line,
The second line includes a CAN_L line, the vehicle controller.

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