JPH07283816A - Lan system for vehicle - Google Patents

Abstract

PURPOSE:To mount/dismount a local station (LCU) without any problem even after a BCM is used in common by implementing polling the connection of a vehicle use device unit at application of power and selecting a control program depending on the polling result. CONSTITUTION:At application of power, a central station BCM 1 operates a setting program and reads data representing whether or not the connection of a keyless LCU (local station) 6 is stored in a memory of the BCM 1. When connected, a control program of a LAN system driven in the BCM 1 is replaced with a control program capable of driving the keyless LCU 6. When the LCU 6 is not connected, a request signal together with address data is outputted to all connectable terminals through a transmission line 7. When no reply signal comes, non-connection of LCU 6 is written in the memory of the BCM 1 and a control program is selected in place of the setting program. When the reply signal is received, the control program controlling the keyless LCU 6 is selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle LAN system having a local station and a central station.

[0002]

2. Description of the Related Art A vehicle LAN system of this type is shown in FIG. 2 and its configuration will be described. In FIG. 2, reference numeral 1 denotes a central station (hereinafter referred to as BCM: body control unit), which has a control program, and various local stations (hereinafter referred to as LCU: local control unit) which will be described later according to the control program. 2, 3, 4, 5,
Multiplex communication is performed with 6 and program control is performed. In this multiplex communication, communication data (for example, door lock / unlock motor control data, power window motor control data, etc.) and address data are transmitted as a pair via the transmission line 7. , For example BCM
When transmitting communication data from 1 to the local station 2, the address data of the local station 2 is added to the communication data and sent out to the transmission line 7. On the contrary, when it is desired to transmit the communication data from the local station 2 to the BCM1, the address data of the BCM1 is added to the communication data and transmitted.

The BCM1 has a diagnostic function,
Immediately after the power is turned on, address data is added to the consult signal and transmitted to each of the LCUs 2, 3, 4, 5 and 6 in sequence, and the LCUs 2, 3, 4, 5 corresponding to the specified address data are transmitted.
Alternatively, waiting for the response data from 6 to be transmitted within a predetermined time, a disconnection check is performed between the BCM 1 and each LCU 2, 3, 4, 5, 6.

Reference numeral 2 is an LCU for the right rear seat, which includes a power window motor 21, a door lock / unlock motor 22,
A power window switch 23 (a door lock / unlock switch and the like is also connected, but omitted for simplification of the drawing) is connected, and data is transmitted from the BCM 1 through a transmission line 7. Then, the collation of the address data among the data is collated with the set and stored address data, and if they coincide with each other, the communication data in the data is read, and the power window motor 2
1 or the door lock / unlock motor 22 is controlled. When the power window switch 23 is turned on, the power window motor 21 is driven.

Reference numeral 3 is an LCU for the left rear seat, which includes a power window motor 31, a door lock / unlock motor 32,
A power window switch 33 (a door lock / unlock switch and the like is also connected, but omitted for simplification of the drawing) is connected, and data is transmitted from the BCM 1 through a transmission line 7. Then, the collation of the address data in the data is collated with the set and stored address data, and if they coincide, the communication data in the data is read and the power window motor 3
1 or the door lock / unlock motor 32 is controlled. When the power window switch 33 is turned on, the power window motor 31 is driven.

Reference numeral 4 denotes an LCU for a driver's seat, which includes a power window motor 41, a door lock / unlock motor 42,
A power window switch 43 (a door lock / unlock switch or the like is also connected, but omitted for simplification of the drawing) is connected, and data is transmitted from the BCM 1 through a transmission line 7. Then, the collation of the address data in the data is collated with the set and stored address data, and if they coincide, the communication data in the data is read, and the power window motor 4
1 or the door lock / unlock motor 42 is controlled. When the power window switch 43 is turned on, the power window motor 41 is driven.

Reference numeral 5 is a passenger seat LCU, which includes a power window motor 51, a door lock / unlock motor 52,
A power window switch 53 (a door lock / unlock switch and the like are also connected, but omitted for simplification of the drawing) is connected, and data is transmitted from the BCM 1 through a transmission line 7. Then, the collation of the address data in the data is collated with the set and stored address data, and if they coincide, the communication data in the data is read and the power window motor 5
1 or the door lock / unlock motor 52 is controlled. When the power window switch 53 is turned on, the power window motor 51 is driven.

Reference numeral 6 denotes a keyless (remote control type locking and unlocking device) LCU, which has an antenna 61 for receiving a door lock signal and a door unlock signal by remote control from outside the vehicle.
When the door lock signal is received, the door is locked, and when the door unlock signal is received, the door is unlocked. Further, the keyless LCU 6 periodically transmits data indicating whether the door is open or closed to the BCM 1 through the transmission line 7. In addition, this LCU for keyless
6 creates data by judging whether the door state switch 62 is in the on state or the off state whether the door is in the open state or in the closed state.

In the above structure, when the power is turned on,
Immediately after that, the diagnostic program of BCM1 is activated,
A request signal is sequentially supplied to each LCU 2, 3, 4, 5 and 6 together with address data. As a result, each LCU 2, 3, 4, 5, 6 to which the request signal is supplied supplies the response signal to the BCM 1 along with the address data via the transmission line 7 immediately after the request signal is supplied.
In No. 1, when the response signal is returned, it is judged that the wire is not in the disconnection state and the alarm signal is not output. On the other hand, when the response signal is not supplied, it is determined that the circuit is in the disconnection state, the alarm signal is output, and the request signal is output to the next LCU.

When the above diagnosis is completed, the BCM1 activates the control program. That is, for example, the switch 23
When is turned on, the power window motor 2 is driven based on that, and the right rear seat LCU 2 drives the window glass upward or downward. Further, when the switch 53 is operated, the door lock / unlock motor 52 is controlled.

When the keyless LCU 6 is remotely operated, the door is locked or unlocked.

[0012]

However, in such a vehicle LAN system, when the user does not need the keyless function and removes the keyless LCU, the request signal is sent from the BCM1. When supplied, the response signal is not transmitted, so that the circuit is always in a disconnection state, and the BCM 1 determines that there is a communication error and issues a notification.

On the contrary, in the case of a BCM that does not have a program for controlling the keyless function from the beginning, if the user tries to attach the Killes LCU with the dealer option, the BCM does not have to be replaced. It didn't happen.

The present invention has been made by paying attention to such problems, and the BCM is made common so that the LC can be used later.
The purpose is to make it possible to freely attach and remove U.

[0015]

L for a vehicle according to the present invention
The AN system includes a plurality of local stations formed by connecting vehicle equipment units, and a central station that performs program control by communicating with the vehicle equipment units of the plurality of local stations by multiplex communication. In the vehicle LAN system in which the device unit in the local station is attachable / detachable, the central station has a predetermined vehicle device unit for the local station at an initial stage when power is turned on. Polling is performed to confirm whether or not the connection is established, and the central station switches the control program according to the result.

[0016]

According to the vehicle LAN system of the present invention, when the power is turned on, the BCM supplies the request signal and the address data to the connection terminal of each LCU as a pair.
When a response signal is supplied through the connection terminal of the LCU, it is determined that the predetermined LCU is connected to the address, and when there is no response signal, the predetermined LCU is not connected, and the status is determined. Stored in the BCM built-in memory, and B
Since the CM control program is changed, normal communication will be performed thereafter between the BCM and the LCU.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the flow chart of the BCM 1 shown in FIG. Since the structure is the same as that shown in FIG. 2, the description of the structure will be omitted.
The flow chart of M1 is different and will be described below.

That is, when the power is turned on, the BCM1 proceeds to step ST100 in FIG.
The microcomputer or the like constituting the above is initially set to operate the setting program, and then the process proceeds to step ST101. In step ST101, data indicating whether or not the keyless LCU 6 is stored in the memory of the microcomputer of the BCM1 is read, and if connected, the process proceeds to step ST108, and the LAN system driven by the BCM1. Switch the control program to a control program that can be driven including the keyless LCU 6, and drive the control program,
The setting is completed (step ST106).

In step ST101, BC
Keyless LC in the memory of the M1 microcomputer
When the data indicating that the U6 is not connected and is not set is read, the process proceeds to step ST102, and the request signal is sequentially transmitted to all the terminals to which the LCU is connected or which can be connected. Output to the transmission line 7 together with the address data, and in the next step ST103,
The BCM 1 receives the response signal from the LCU of the address to which the request signal is supplied, and determines the presence or absence of the response signal. When there is no response signal, the process proceeds to step ST104 and BCM1
LCU6 for keyless in the memory of microcomputer
Is written, and the process proceeds to the next step ST105.

In step ST105, the driving of the setting program is stopped, a control program to replace it is selected, the process proceeds to step ST106, and the initial setting program is ended. If there is a response signal in step ST103 and it is determined that the keyless LCU6 is connected, it is stored in the memory of the microcomputer of the BCM1 that the keyless LCU6 is connected, and then in step ST108. Go ahead,
A control program for controlling including the keyless LCU 6 is selected.

[0021]

As described above, according to the present invention, since the BCM can be shared, the LCU can be freely attached even afterward, which is very convenient for the user. .

[Brief description of drawings]

FIG. 1 is a flowchart showing a BCM1 setting program according to an embodiment of the present invention.

FIG. 2 is a circuit block diagram of a vehicle LAN system.

[Explanation of symbols]

 1 BCM 2, 3, 4, 5, 6 LCU

Claims (1)

[Claims] 1. A plurality of local stations formed by connecting vehicle equipment units, and a central station that performs program control by communicating with the vehicle equipment units of the plurality of local stations by multiplex communication. In the vehicle LAN system in which the device unit in the local station is attachable and detachable, the central station has a predetermined vehicle device unit for the local station at an initial stage when power is turned on. The vehicle LAN system is characterized in that polling is performed to confirm whether or not the connection is established, and the central station switches the control program according to the result.