JPH06351078A - Communication equipment for vehicle - Google Patents

Abstract

PURPOSE:To directly drive a terminal equipment independently of drive information outputted from a master station at the time of detecting the abnormality of a communication line by an abnormality detecting means. CONSTITUTION:Respective slave stations 2 to 5 connected to a master station 1 having a communication part 11 and a logic part 12 through a multiplex transmission line L are respectively provided with communication parts 21, 31, 41, 51, drive control parts 27, 34, 44, 54, drive switching parts 28, 35, 45, 55, power window switches 22 to 25, 32, 42, 52, and power window motors 26, 33, 43, 53. The communication parts 21, 31, 41, 51 in respective slave stations detect whether abnormality exists in information transfer between the master station and each of the slave stations 2 to 5 or not, and at the time of detecting abnormality in the line L, respectively switch the switching parts 28, 35, 45, 55 and directly drive the power window motors 26, 33, 43, 53 by the operation of the switches 22 to 25, 32, 42, 52.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle communication device for connecting a master station and a slave station via a communication line and driving a terminal device in the slave station according to driving information from the master station. .

[0002]

2. Description of the Related Art A large number of terminal devices such as headlamps, door locks, and power windows, and a large number of operating members such as switches for operating these terminal devices are connected through a small number of communication lines to provide information. A vehicle communication device that performs transmission has been conventionally known (for example, Japanese Patent Laid-Open No. 3-1399).
Japanese Patent Publication No. 97). In this type of vehicle communication device, a master station having a communication unit and a logic unit, a large number of operating members such as a power window switch, a large number of terminal devices such as a power window motor, and a plurality of slave stations having a communication unit are provided. , Are connected via multiplex transmission lines. A unique address is assigned to each slave station, and the master station sequentially sends the addresses of the slave stations to the multiplex transmission line at regular time intervals to communicate with a specific slave station. The slave station, which is called by the master station, collects the operation information of the operation members of the own station and transmits it to the master station, and the master station drives the terminal device based on the manipulation information transmitted from each slave station. Send the information to the relevant slave station. Each slave station drives the terminal device based on the information transmitted from the master station.

[0003]

However, if the signal information transmitted through the communication line changes due to an abnormality such as disconnection of the multiplex transmission line or electromagnetic noise, it becomes impossible to transmit information between the master station and the slave station. Otherwise, incorrect information may be transmitted, and even if each slave station operates an operating member such as a power window switch, the terminal device such as a power window motor cannot be driven.

An object of the present invention is to provide a vehicular communication device capable of directly driving a terminal device of a slave station on the slave station side when an abnormality in a communication line is detected, regardless of drive information from the master station. To provide.

[0005]

The present invention will be described with reference to FIG. 1 showing an embodiment.
Operation members 22 to 2 for instructing the drive of 33, 43, 53
5, 32, 42, 52 and terminal devices 26, 33, 4
Drive control means 27, 34, 4 for driving and controlling 3, 53
A plurality of slave stations 2, 3, 4, 5 having 4, 54 and information transmission with the slave stations 2, 3, 4, 5 are performed.
Applied to a vehicle communication device provided with a master station 1 which outputs drive information to drive control means 27, 34, 44, 54 based on instructions from operation members 22, 25, 32, 42, 52 of 3, 4, 5. To be done. And to each slave station 2, 3, 4, 5
Abnormality detecting means 21, 31, 41, 51 for detecting an abnormality
When an abnormality is detected by the abnormality detecting means 21, 31, 41, 51, each slave station 2, 3, 4, 5 is entered without going through the master station 1.
Drive switching means 28, 35, 45, 55 for outputting drive information to the drive control means 27, 34, 44, 54 in accordance with instructions from the operating members 22 to 25, 32, 42, 52.
The above object is achieved by providing and.

[0006]

Function: Abnormality detecting means 21, 3 of each slave station 2, 3, 4, 5
When an abnormality is detected at 1, 41, 51, each slave station 2, 3,
4, 5 switch the drive switching means 28, 35, 45, 55, so that when the operating members 22 to 25, 32, 42, 52 of the slave stations 2, 3, 4, 5 are subsequently operated, the respective slaves are operated. The stations 2, 3, 4, and 5 do not involve the master station 1 but drive control means 2
The drive information is output to 7, 34, 44 and 54. As a result, each slave station 2, 3, 4, 5 is connected to the terminal device 26, 3
3, 43, 53 to the operation members 22 to 25, 32, 42, 5
2 can be operated directly.

Incidentally, in the section of means and action for solving the above problems for explaining the constitution of the present invention, the drawings of the embodiments are used for making the present invention easy to understand. It is not limited to.

[0008]

1 is a circuit diagram of an embodiment in which a vehicle communication device according to the present invention is used to control a power window device. In FIG. 1, reference numeral 1 denotes a master station, which includes a communication unit 11 that communicates with a plurality of slave stations and a logic unit 12 that controls a terminal device of each slave station. The master station 1 is connected to the slave stations 2, 3, 4, 5 via a multiplex transmission line L. The slave station 2 includes a communication unit 21 for communicating with the master station 1, power window switches 22, 23, 34, 25 for instructing opening and closing of the window glass of each seat, and a window glass of the driver's seat. The drive control unit 27 for controlling the operation of the driven power window motor 26, and the multiplex transmission line L
Is abnormal, a drive switching unit 28, which will be described later, switches the operation of the drive control unit 27. Child station 3
Is a communication unit 31 for communicating with the master station 1,
A power window switch 32 for instructing opening and closing of the passenger seat windshield, a drive control unit 34 for controlling the operation of a power window motor 33 for driving the passenger seat windshield, and a drive switching unit 35. Child station 4
Is a communication unit 41 for communicating with the master station 1,
A power window switch 42 for instructing the opening and closing of the right rear window glass, a drive control section 44 for controlling the operation of a power window motor 43 for driving the right rear window window, and a drive switching section 45. . Child station 5
Is a communication unit 51 for communicating with the master station 1,
A power window switch 52 for instructing opening and closing of the left rear window glass, a drive control section 54 for controlling the operation of a power window motor 53 for driving the left rear window glass, and a drive switching section 55. . Also,
The communication units 21, 31, 41, 51 of the respective slave stations each have a CPU (not shown).

In FIG. 1, the master station 1 sequentially sends a signal to each slave station at regular time intervals, and when each slave station receives a signal from the master station 1, the slave station sends operation information of a power window switch included in each slave station. It is sent to the master station 1. Based on the operation information of the power window switch from each slave station, the master station 1 sends the drive information of the power window switch to each slave station. When drive information is input from the master station 1, the corresponding slave station opens and closes the window glass. For example, when the power window switch 32 of the slave station 3 is operated, the communication unit 31 of the slave station 32 sends the information to the master station 1 through the multiplex transmission line L, and the master station 1
When the logic unit 12 analyzes the contents of the multiplex transmission line L and recognizes that the power window switch 32 of the slave station 3 has been operated, the drive information of the power window motor 33 is transmitted to the slave station 3 through the multiplex transmission line L. Is output. When the slave station 3 receives the information, it sends a signal to the drive controller 34 to drive the power window motor 33 to open and close the window glass.

Although FIG. 2 is a circuit diagram of the drive control unit 34 and the drive switching unit 35 of the slave station 3, the drive switching units and the drive control units of the other slave stations are also composed of similar circuits. The drive switching unit 35 is composed of two NOR gates G1 and G2, and a signal line L1 and a signal line L are input to the NOR gate G1.
2 are connected. The signal line L1 has a low level U when the power window switch 32 is operated to the UP side.
The P switch terminal T1 is connected to the UP input terminal T2 of the communication section 31, and the error output terminal T3 of the communication section 31 is connected to the signal line L2. A low level signal is output from the error output terminal T3 when an error occurs in the multiplex transmission line L. The signal line L is input to the NOR gate G2.
3 and the signal line L2 are connected, and the signal line L3 is connected to the DOWN switch terminal T4 which becomes a low level when the power window switch 32 is operated to the DOWN side and the DOWN input terminal T5 of the communication section 31. Further, the UP switch terminal T1 and the DOWN switch terminal T4 are set to a high level by pull-up resistors (not shown) when the power window switch 32 is not operated on the respective terminal sides.

The outputs of the gates G1 and G2 are input to the bases of the transistors TR1 and TR2 of the drive control section 34 via the diodes D1 and D2, respectively, and the transistor TR
Relay RL1 is connected to the collector terminal of transistor T
A relay RL2 is connected to the collector terminal of R2, and these relays RL1 and RL2 are connected to the power window motor 34.
Connected via.

In the circuit diagram of FIG. 2, when the communication unit 31 of the slave station 3 determines that there is no abnormality in the information transmission with the master station 1,
Since the signal line L2 connected to the error output terminal T3 becomes high level, both outputs of the NOR gates G1 and G2 become low level. Therefore, the transistor TR1
The UP output terminal T6 of the communication section 31 is input to the base of the transistor via the diode D3, and the DOWN output terminal T7 of the communication section 31 is input to the base of the transistor TR2 via the diode D4. In this state, for example, when the power window switch 32 is operated to the UP side, the communication unit 31 sets the UP output terminal T6 to the high level and DOWN.
The output terminal T7 is set to low level. Therefore, the transistor TR1 is turned on, the relay RL1 is activated, and a current flows through the power window motor 34 in the direction of the solid arrow in FIG. 2, which causes the window glass to move upward (close the window glass).

On the other hand, when the communication unit 31 of the slave station 3 determines that the information transfer with the master station 1 is abnormal, the error output terminal T
Since the signal line L2 connected to 3 goes low,
A signal obtained by inverting the signal on the signal line L1 is output from the OR gate G1, and a signal obtained by inverting the signal on the signal line L3 is output from the NOR gate G2. Further, when the signal line L2 is at the low level, the communication unit 31 automatically becomes the fail safe state, and the communication unit 31 causes the UP output terminal T6 and DOW.
Both the N output terminals T7 are set to low level. Therefore, the NOR gate G is provided at the base of the transistor TR1.
The output of 1 is input via the diode D1, and the output of the NOR gate G2 is input to the base of the transistor TR2 via the diode D2.

That is, at the time of abnormality, the transistor TR
When the power window switch 32 is operated in this state, the signal obtained by inverting the signal on the signal line L1 is input to the base of 1 and the signal obtained by inverting the signal on the signal line L2 is input to the base of the transistor TR2. Depending on the state of the switch, the power window motor 34 can be driven without going through the communication unit 31. For example, when the power output switch 32 is operated to the DOWN side while the error output terminal T3 of the communication unit 31 is at the low level, the signal line L3
Goes low and the output of the gate G2 goes high. Therefore, the base of the transistor TR2 becomes high level, the transistor TR2 is turned on, and the relay RL is turned on.
1 works. On the other hand, at this time, since the signal line L1 is at the high level, the output of the NOR gate G1 is at the low level, and the transistor TR1 remains off. Therefore, a current flows through the power window motor 34 in the direction of the broken line in FIG. 2, and the window glass moves downward (the window glass opens).

FIG. 3 is a flow chart showing the operation of the CPU of the communication section of each slave station. In step S1, the signal transmitted from the master station 1 via the multiplex transmission line L is received.
In step S2, it is determined whether the information transfer between the master station 1 and the slave station is abnormal. For example, when there is no call from the master station 1 by its own address for a certain period of time, or when the signal level of the multiplex transmission line L fluctuates irregularly due to noise or the like, it is determined to be abnormal. If it is determined in step S2 that the signal from the master station 1 is not abnormal, the process proceeds to step S3, the error output terminal T6 is set to the high level, and the process ends. If it is determined to be abnormal in step S2, the process proceeds to step S4, and the error output terminal T3, the UP output terminal T6, and the DOWN output terminal T7 are all set to the low level, and the processing ends.

When the operation of the vehicle communication device described above is summarized based on FIG. 2, the communication unit of each slave station always detects whether or not the information transmission with the master station 1 is abnormal, and it is determined that there is an abnormality. When judged, the error output terminal T3 is set to the low level to notify the abnormality, and both the UP output terminal T6 and the DOWN output terminal T7 are set to the low level to enter the fail-safe mode. When the error output terminal T6 becomes low level, the operation of the drive switching unit 35 is switched. Therefore, when the power window switch 32 is operated thereafter, the power window motor can be directly driven without going through the master station 1. Therefore, even if an abnormality occurs in the information transmission between the master station 1 and each slave station due to the disconnection of the multiplex transmission line L or the like, it is possible to directly open and close the window glass by operating the power window switch.

As described above, in the above embodiment, the drive switching section is newly provided in the conventional slave station configuration so that the operation of the drive control section is automatically switched when an abnormality occurs in the multiplex transmission line or the like. A highly reliable vehicle communication device can be realized at low cost. Also, in the event of an abnormality, the window glass is opened and closed directly by operating the power window switch,
A quick operation becomes possible. In the above embodiment, the drive switching unit is composed of two NOR gates as shown in FIG. 2. However, if the power window motor can be directly controlled by operating the power window switch when an abnormality occurs in the multiplex transmission line or the like, The circuit configuration is not limited to FIG. Further, in the above embodiment, each slave station has a power window motor as a terminal device,
Although the case where the power window switch is provided as the operation member has been described, the terminal device and the operation member are not limited to this, and for example, various terminal devices for vehicles such as a case where the terminal device has a door lock actuator and the operation member has a door lock switch, etc. The present invention can be applied to devices and operating members.

In the embodiment thus constructed, the power window switches 22 to 25, 32, 42 and 52 are used as the operating members, and the power window motors 26, 33, 43 and
53 is a terminal device, and drive control units 27, 34, 44, 54
To the drive control means, the drive switching units 28, 35, 45,
55 is the drive switching means, and the communication units 21, 31, 41,
Reference numerals 51 correspond to the abnormality detecting means, respectively.

[0019]

As described in detail above, according to the present invention, when an abnormality of the communication line or the like is detected by the abnormality detecting means, the terminal device such as the power window motor included in each slave station is operated. Since it can be directly driven by an instruction from a member without going through the master station, a highly reliable vehicle communication device can be realized. Further, since it is only necessary to add drive switching means to the conventional vehicle communication device, there are few design changes, and the present invention can be realized at low cost.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a vehicle communication device according to the present invention.

FIG. 2 is a circuit diagram of a drive control unit and a drive switching unit of the vehicle communication device shown in FIG.

FIG. 3 is a flowchart showing an operation of a CPU of a communication unit of each slave station.

[Explanation of symbols]

1 Master station 2, 3, 4, 5 Slave station 21, 31, 41, 51 Communication unit 22-25, 32, 42, 52 Power window switch 26, 33, 43, 53 Power window motor 27, 34, 44, 54 Drive control unit 28, 35, 45, 55 Drive switching unit

Claims (1)

[Claims] 1. A plurality of slave stations having an operation member for instructing driving of a terminal device and a drive control means for driving and controlling the terminal device, and information operating with each of the slave stations, and the operation member of each slave station. In the vehicular communication device including a master station that outputs drive information to the drive control means based on the instruction, the each slave station detects an abnormality, and an abnormality is detected by the abnormality detection means. Then, the vehicle communication device is provided with drive switching means for outputting drive information to the drive control means according to an instruction from the operation member of each slave station without going through the master station.