JP2699969B2 - Vehicle communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device for a vehicle, for example, which facilitates the operation of an operation section of various devices mounted on a vehicle, and more particularly, to a case where the state of an ignition switch is turned from off to on. The present invention relates to a vehicle communication device capable of faithfully reproducing states of various devices in a vehicle to a state immediately before an ignition switch is turned off last time.

[0002]

2. Description of the Related Art Conventionally, a vehicle is provided with a plurality of switches, such as a light switch and a wiper switch, for setting the state of a device mounted on the vehicle. Information about the operation is transmitted via the line, and the operation of the device corresponding to the operated switch, such as the blinking of a light or the operation of a wiper, is performed.

[0003] On the other hand, with the enhancement of the functions of vehicle accessories, it has been detected whether or not a plurality of switches have been operated.
A transmitting station for transmitting information regarding the operation of the detected operation unit and a receiving station for operating an actuator such as a relay or a motor based on the information regarding the operation of the operation unit are provided. Various types of vehicular communication devices have been proposed that transmit and receive signals between a transmitting station and a receiving station. FIG. 3 is a block diagram showing a conventional vehicle communication device. The generator 1 is connected to the power line 101.
03 and the battery 105 are connected. A plurality of transmitting stations 107a and 107b and a plurality of receiving stations 109a and 109b are connected to the power line 101, respectively. The transmission stations 107a and 107b include switches 111a and 11 such as light switches and wiper switches.
1b is connected and receiving stations 109a, 109b
Actuator 113a as a load such as a motor,
Each of 113b is connected.

A common communication line 11 is provided between the plurality of transmitting stations 107a and 107b and the plurality of receiving stations 109a and 109b.
5 are provided, and multiplex communication is performed by time division between a plurality of transmitting stations and receiving stations via the common communication line 115. That is, the address clock generation station 1
Reference numeral 17 denotes a plurality of transmitting stations 107a, 1 via a signal line 119.
07b and the receiving station 109
a, 109b, and time-division communication is executed based on the address clock from the address clock generation station 117.

[0005] As a result, when a signal is transmitted from a designated transmitting station to a receiving station every transmission allocated time,
The receiving station operates the corresponding actuator based on the received signal.

[0006]

By the way, for example, in a system in which the state is changed each time the operation is performed, the contacts are closed only while pressing switches using low-cost rubber contacts or the like as the switches 111a and 111b. In the case of using a simple switch (momentary switch), it is necessary to store the state set by such a momentary switch using a storage unit for storing the state, for example, a latch such as a flip-flop circuit.

However, once the ignition switch is turned off, the information stored in the latch such as the flip-flop circuit described above disappears, and the various operation switches of the operation unit must be reset when the vehicle is driven next time. There was room for improvement.

The present invention has been made in view of the above-mentioned circumstances, and when the state of the ignition switch is turned on from off, the state of various devices in the vehicle is checked immediately before the ignition switch is turned off last time. (Hereinafter, referred to as the immediately preceding state), and at this time, even if, for example, erroneous transmission of information relating to the immediately preceding state occurs, various devices are supposed to be based on the erroneous immediately preceding state information. It is an object of the present invention to provide a vehicle communication device capable of preventing malfunction of the vehicle before it occurs.

[0009]

According to a first aspect of the present invention, there is provided a setting device for setting a state of a connected device, and a power supply which is always secured and set by the setting device. First storage means for storing state information relating to the state of the apparatus, wherein when the ignition switch is turned on, the state information stored in the first storage means is transmitted, and the state information and the transmission state are transmitted. First state control means for comparing the state information inputted from the beginning and returning the state information again when they do not coincide with each other, and power is supplied only when the ignition switch is turned on, and set by the setting means. State information, or the first
A second storage means for selectively storing the state information input from the control means, and a second control for sending the state information stored in the second storage means to the first control means. And a communication device for a vehicle.

According to the first aspect of the present invention, when the state of the device connected is newly set by the setting means when the ignition switch is turned on, the state information relating to the state of the device is firstly stored. 2 is input to the control means. In response to this, the second control means stores the state information in the second storage means, and sends out the stored state information to the first control means. In response to this, the first control means controls the state of the apparatus as set based on the input state information. As described above, when the ignition switch is turned on, the above-described processing is executed.

When the ignition switch is turned off, the supply of power to the second control means is cut off. As a result, the state information stored in the second storage means is lost, while the immediately preceding state information stored in the first storage means always supplies power to the first control means. Is secured and stored without being lost. At this time, when the ignition switch is turned on, the first control unit sends out the immediately preceding state information stored and held in the first storage unit. In response to this, the second control means stores the immediately preceding state information in the second storage means, and sends back the stored immediately preceding state information to the first control means. In response to this, the first control means compares the immediately preceding state information sent back and the immediately preceding state information stored and held in the first storage means, and when they do not match, in other words, When the erroneous transmission of the status information occurs, the immediately preceding status information stored and held in the first storage unit is transmitted again.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the drawings.

First, the configuration will be described with reference to FIG. 1. A power supply line 1 includes a power supply monitoring circuit 5 built in a main control unit 3 as a first control means, and a second control means. Each of the slave control units 7 is connected. The power supply line 1 is connected to a power supply such as a battery via an ignition switch S.
When the ignition switch S is turned on, a predetermined DC voltage is supplied to the power supply monitoring circuit 5 and the slave control unit 7 via the power supply line 1. The main control unit 3 is directly connected to a battery (not shown) via a power line 9, and a predetermined DC voltage from the battery is constantly supplied to the main control unit 3 via the power line 9. .

The main control unit 3 and the sub control unit 7 are connected to each other via a communication line 11, and communicate with each other by a time-division communication method, that is, at a preset allocation time.

The slave control unit 7 has a plurality of operation switches 13a as setting means for forming an operation section.
.. 13n are connected. The plurality of operation switches 13a... 13n are, for example, light switches, wiper switches, or the like, and are formed by momentary switches that use rubber contacts or the like and close the contacts only while the switches are pressed. Each of the plurality of actuators 15a to 15n is connected between the slave control unit 7 and the power supply line 1. As these actuators 15a... 15n, loads corresponding to the respective operation switches 13a.

Next, the internal configuration of the control unit 7 will be described.

The storage circuit 21 has a plurality of operation switches 13
13n are connected to each other. 13n are connected to the storage circuit 21 in parallel with each other, and when the operation switches 13a... 13n are operated, information on the operation of the operation unit is given to the storage circuit 21 in parallel. . That is, the storage circuit 21 inputs an N-bit parallel signal as information relating to the operation of the operation unit. The storage circuit 21 is provided with a storage element corresponding to N bits, for example, a T-type flip-flop circuit.

The operation of the flip-flop circuit corresponding to N bits provided in the storage circuit 21 is configured to be inverted only when the corresponding operation switch 13a... 13n is turned on.

The storage circuit 21 is connected to the transmission controller 23 and outputs the information on the operation of the operation section stored in the storage circuit 21 to the transmission controller 23 as a parallel signal. The transmission controller 23 converts the parallel data input from the storage circuit 21 into serial data.
A serial conversion unit, for example, a shift register corresponding to N bits is provided, and the converted serial data is transmitted via the communication line 25. Note that the storage circuit 21 constitutes a second storage unit.

The oscillator 27 has a built-in oscillating circuit that oscillates at a predetermined cycle and a frequency dividing circuit that divides the frequency of the oscillating pulse from the oscillating circuit and outputs a predetermined clock pulse. The oscillator 27 is connected to each of the transmission controller 23 and the reception controller 29, and sends out the above-described clock pulse having a predetermined cycle to the transmission controller 23 and the reception controller 29.

The transmission controller 23 is connected to the main control unit 3 via the communication line 25, the bidirectional switch 31, and the communication line 11, and the reception controller 29 is connected to the communication line 3.
3, connected to the main control unit 3 via the bidirectional switch 31 and the communication line 11. Between the transmission controller 23, the main control unit 3 and the reception controller 29, a so-called time-division is performed at every preset time according to the operation timing of the bidirectional switch 31 and the clock pulse of a predetermined period from the oscillator 27. Is executed. For example, when the bidirectional switch 31 is switched to the communication line 25 side and the communication line 11 and the communication line 25 are connected, the transmission allocation time is set, and the transmission controller 23 sets the predetermined period from the oscillator 27. The serial data is transmitted to the main control unit 3 via the communication line 25, the bidirectional switch 31, and the communication line 11 in response to the clock pulse. The bidirectional switch 31 is connected to the communication line 33.
Side, and when the communication line 11 and the communication line 33 are connected, the time is set as the reception quota time. The data is transmitted to the reception controller 29 via the switch 31 and the communication line 33.

The reception controller 29 has a built-in serial-parallel converter for converting serial data into parallel data. When information from the main control unit 3, that is, serial data, is input via the communication line 33, The input serial data is converted into parallel data according to a clock pulse of a predetermined cycle from the oscillator 27. The reception controller 29 includes N actuators 15
a ... 15n are connected. These actuators 15a... 15n are connected in parallel with each other. Therefore, the reception controller 29 operates the corresponding actuator based on the converted parallel data.

The reception controller 29 is connected to the storage circuit 21 and stores information from the main control unit 3, that is, information relating to the operation of the operation unit immediately before the ignition switch S described later is turned off. Send to

Next, the internal configuration of the main control unit 3 will be described.

The communication line 11 is connected to a control unit 43 via an input / output circuit 41. When the input / output circuit 41 receives serial data from the transmission controller 23 via the communication line 11, the input / output circuit 41 performs signal processing, for example, converts the serial data into parallel data, and sends it to the control unit 43. Further, when the input / output circuit 41 receives the parallel data from the control unit 43, the input / output circuit 41 performs signal processing, for example, converts the data into serial data and transmits the serial data to the communication line 11.

The control unit 43 includes an arithmetic processing unit such as a microcomputer and a memory as a storage unit for storing information relating to the operation of the operation unit. A predetermined DC voltage from a battery (not shown) is always supplied to a memory built in the control unit 43, and information stored in the memory is securely held even after the ignition switch S is turned off. You. That is, this memory forms a first storage unit for storing information relating to the operation of the operation unit immediately before the ignition switch S is turned off.

The power supply monitoring circuit 5 is connected to the control unit 43 and to the power supply line 1 and monitors the power supply voltage of the power supply line 1. When the power supply monitoring circuit 5 detects that the ignition switch S has been turned off based on the power supply voltage from the power supply line 1, the operation of the control unit 43 is stopped by outputting a stop signal to the control unit 43. When the power supply monitoring circuit 5 detects that the ignition switch S has been turned on based on the power supply voltage of the power supply line 1, the power supply monitoring circuit 5 outputs a start signal to the control unit 43 to start the operation of the control unit 43.

Next, the operation during steady running will be described.

When the operation switches 13a... 13n such as light switches and wiper switches are operated, information relating to the operation of these operation sections is stored in the storage circuit 21.
The transmission controller 23 converts the information on the operation stored in the storage circuit 21 into serial data within a predetermined allotted time, and converts the converted serial data into the main data via the communication line 25, the bidirectional switch 31, and the communication line 11. Transmit to control unit 3.

In the main control unit 3, the communication line 11
And information about the operation of the operation unit input via the input / output circuit 41 is stored in the memory. Further, the control unit 43 sends out information on the operation of the operation unit stored in the memory, that is, parallel data within a predetermined reception allotted time, converts the data into serial data by the input / output circuit 41, and then transmits the data to the communication line 11,
The data is transmitted to the reception controller 29 via the bidirectional switch 31 and the communication line 33.

When receiving information, ie, serial data, from the main control unit 3 via the communication line 33, the reception controller 29 converts the information into parallel data in accordance with a predetermined clock pulse from the oscillator 27. Reception controller 2
9 operates the corresponding actuators 15a to 15n based on the converted parallel data.

Next, when the ignition switch S is turned off in such a state, the ignition switch S
Is stored in the memory of the main control unit 3 immediately before the switch is turned off. Even after the ignition switch S is turned off, the information is stored in the memory based on power supply from a battery (not shown). Information is securely retained.

Next, the operation when the ignition switch S is turned on in such a state will be described.

The control unit 43 instructs transmission of output data as shown in FIG. That is, the control unit 43 continues the L-level start signal 51 as shown in FIG.
3 is output. Further, the control unit 43 transmits the information stored in the memory, that is, the information relating to the operation of the operation unit immediately before the ignition switch S is turned off, following the signal 53.

When the reception controller 29 inputs the L level signal 53 following the start signal 51 via the communication line 33, the subsequently received information is transmitted to the operation immediately before the ignition switch S is turned off. The information on the operation of the operation unit, that is, the input data before the operation is stopped is determined, and the serial data, which is the information on the operation of the operation unit, is sent to the storage circuit 21 as it is. The storage circuit 21 converts the serial data from the reception controller 29 into parallel data, and stores the converted parallel data.
At this time, the storage circuit 21 keeps the reception controller 2 for a predetermined time after the ignition switch S is turned on.
The input of information from the operation switches 13a... 13n is prohibited until the information from 9 is input and stored.

The transmission controller 23 transmits the information from the storage circuit 21, that is, the information relating to the operation of the operation unit immediately before the ignition switch S is turned off by the communication lines 25 and 11.
Is transmitted to the control unit 43 via the.

As shown in FIG. 2 (B), when the data information transmitted from the transmission controller 23 is input, the control section 43 collates the input data information with the information stored in the memory and performs transmission control. If there is an error in the information transmitted from the device 23, an L level signal 53 is transmitted again after the start signal 51, and the information stored in the memory, that is, immediately before the ignition switch S is turned off. Is transmitted again.

When the information transmitted from the transmission controller 23 and the information stored in the memory are the same, the control unit 43 continues the start signal 51 as shown in FIG. An H-level signal 55 is transmitted, and the information stored in the memory is transmitted as normal output data following the H-level signal 55.

When the reception controller 29 inputs the H-level signal 55 following the start signal 51 from the control unit 43 via the communication line 33, the information input following the H-level signal 55 is normally transmitted. It is determined that the output data is the normal output data, the normal output data is converted to parallel data,
The corresponding actuators 15a to 15n are operated based on the converted parallel data.

Thus, the actuators 15a... 15n
Is the same state as the previous time, that is, the ignition switch S
Is set to the same state as the state immediately before the switch is turned off.

As described above, in the control unit 43, the transmission controller 2
By comparing the information transmitted from 3 with the information stored in the memory, the information on the operation of the operation unit immediately before the ignition switch S is turned off can be reliably transmitted to the reception controller 29. It is possible to execute highly accurate communication control.

[0042]

As described above, according to the first aspect of the invention, when the state of the ignition switch is turned on from off to on, the state of various devices in the vehicle is determined by the last time the ignition switch was turned off. Since the state immediately before the operation is faithfully reproduced, the state of the various devices in the vehicle is reproduced to the state immediately before the operation, which is suitable for the operator. As a result, the operability of the various devices is improved.

In particular, when the state of the ignition switch is turned from off to on, the first control means stores the immediately preceding state information returned from the second control means and the first storage means. The stored state information is compared with the immediately preceding state information, and when they do not match, the immediately preceding state information stored in the first storage unit is transmitted again. Even in this case, there is an excellent effect that various devices can be prevented from malfunctioning based on erroneous immediately preceding state information.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of FIG. 1;

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 Reference Signs List 1 power supply line 3 main control unit 5 power supply monitoring circuit 7 slave control unit 9 power supply line 11 communication line 13a ... 13n operation switch 15a ... 15n actuator 21 storage circuit 23 transmission controller 25 communication line 27 transmitter 29 reception controller 31 Bidirectional switch 33 Communication line 41 Input / output circuit 43 Control unit 51 L-level start signal 53 L-level signal 55 H-level signal S Ignition switch

Claims (1)

(57) [Claims] 1. A setting means for setting a state of a device to be connected, and a first storage means for storing state information relating to the state of the device set by the setting means, wherein power supply is always ensured, When the ignition switch is turned on, the state information stored in the first storage means is sent out, and the state information is compared with the state information inputted back from the destination. Control means for sending out again, and power information is supplied only when an ignition switch is turned on, and the status information set by the setting means or the status information inputted from the first control means. And a second control means for selectively transmitting the state information stored in the second storage means to the first control means. Vehicle communication apparatus according to.