JP3372022B2 - Data communication control 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 data communication control device suitable for use in an automobile.

[0002]

2. Description of the Related Art Conventionally, in a wired data communication line, when handling serial data in which a plurality of data are continuous, a clock synchronization method is generally used as a method of receiving sent data. In such a system, for example, as shown in FIG. 4, the reception operation is started in response to the output of the latch signal, and the data line is accessed when the pulse of the clock signal which is turned on / off at a constant interval falls. Then, a plurality of continuous data are sequentially stored in each memory, and the reception of one communication data is completed by outputting the next latch signal. On the other hand, in recent years, in automobiles such as one-box cars, the number of electric components such as an air conditioner, an audio system, and a sunroof that can be operated by an infrared remote controller is increasing.

[0003]

However, in an automobile, in order to utilize the transmission data of the infrared remote controller in a plurality of devices in real time, a communication line using a harness is formed between the plurality of devices and the plurality of devices are formed. When constructing a system for acquiring data in the above-mentioned clock synchronization system, the following problems occur.

For example, in the case where the sunroof can be operated by a remote controller, if the above-mentioned latch signal line is broken or short-circuited when the sunroof is opened and closed by the remote controller unit, the sunroof of the sunroof can be removed even if the finger is released from the operation button of the remote controller unit. It is expected that the controller will not be able to obtain an off signal to stop its operation and consequently the sunroof will not be able to stop. Further, if the above-mentioned data line is short-circuited, all the data in one communication data will be turned "ON", and the sunroof may operate regardless of the user's operation.

The present invention has been made in view of the above circumstances, and provides a data communication control device capable of preventing malfunction of a device in a system for controlling the device based on a control command sent from a communication line. To aim.

[0006]

In order to solve the above problems, a data communication control device of the present invention comprises a plurality of lines through which a latch signal, a clock signal and data are transmitted and received. Clock signal detecting means provided in a wired communication line of an automobile including a control command for controlling the clock signal and detecting the clock signal
And when the clock signal cannot be detected by this clock signal detecting means, the clock signal is detected from the previous latch signal.
And the first invalidation processing means for invalidating the received data stored in the memory while it is detected that is not detected .

In such a structure, a clock is generated during communication.
If no clock signal is detected, the clock from the previous latch signal is used.
Memory while detecting that no signal is detected.
Received data is invalid processing. Therefore, when the line for transmitting and receiving the clock signal is short-circuited or disconnected, it is possible to prevent the communication of an erroneous control command due to the short-circuit or disconnection.

In addition to this, a latch for detecting the latch signal
Latch signal detecting means and the latch signal detecting means.
Switch signal is not detected within a certain period of time, the previous
The second invalidation processing means for invalidating the received data stored in the memory within a fixed time after the detection of the switch signal is provided.

In such a configuration, if the latch signal is not detected during communication, the previous latch signal may be detected.
Then, the received data stored in the memory within a certain time is invalidated. Therefore, if the line for transmitting / receiving the latch signal is short-circuited or broken, it is possible to prevent the communication of an erroneous control command due to the short-circuit or disconnection.

Further, a data inspecting means for inspecting the codes of a plurality of data constituting the received communication data, and an invalid processing for the received data in which all the codes are inspected by this data inspecting means The invalidation processing means 3 is provided.

In such a configuration, during communication, if all the codes of the plurality of data constituting the received data are inspected to be "ON", the received data is invalidated. Therefore, if the line that sends and receives data is shorted,
Communication of an erroneous control command due to it can be prevented.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control system of electric components in a vehicle compartment in a one-box vehicle equipped with a data communication control device according to the present invention, in which a front seat air conditioner amplifier 1 stored inside an instrument, and A rear seat multi-remote control amplifier 2 which is housed in the upper portion of the front seat and is connected to the front seat air conditioner amplifier 1 through a first communication line L1 and a second communication line L2 which are harnesses is mainly configured. ing.

The front seat air conditioner amplifier 1 has an audio 3,
The front air conditioner amplifier 4 controls the front air conditioner 4 and the rear air conditioner 5, and the front seat air conditioner amplifier 1 includes a room temperature sensor and an outside air temperature sensor for obtaining information necessary for controlling the front and rear air conditioners 4, 5. Various sensors 6 for controlling the air conditioner are connected. Further, the rear seat multi-remote control amplifier 2 is connected to the front seat air conditioner amplifier 1 via an infrared remote control receiving section 7 connected via a first communication line L1 and a control section connected via a second communication line L2. 8, a serial / parallel conversion driver 9 and a tube light display unit 10 connected to both the control unit 8 and the serial / parallel conversion driver 9.

The tube light display portion 10 has a sunroof lock indicator 10a portion and an air conditioner display portion 10b which are exposed in the passenger compartment. The sunroof / lock indicator section 10a is a section for displaying the locked state of the sunroof based on the display signal sent from the control section 8, and the air conditioner display section 10b is for the front seat air conditioner amplifier via the second communication line L2. This is a part for displaying the setting contents of the rear air conditioner 5 based on the display signal sent from the device 1.

Although not shown, the control section 8 has a display circuit for driving the tube light display section 10, a CPU, a ROM in which a control program for the CPU and various parameters are stored, and various types according to the operation of the CPU. R to store data
It has an input / output device including an AM, a timer, an A / D converter, a D / A converter, and the like, and functions as the data communication control device of the present invention by operating based on the control program. Further, the control section 8 includes a front seat sunroof switch 12, a rear lamp / main switch 13, an all-door switch 14, a room lamp switch 15, a sunroof drive block 16, a sunroof lock switch 17, and a room lamp 18, which are provided in the vehicle compartment. Each is connected. The room lamp switch 15 is specifically a switch for turning on / off and a light / dark switch.

On the other hand, the first communication line L1 connecting the front seat air conditioner amplifier 1 and the infrared remote control receiver 7 described above.
Is remote control data when one of the operation buttons of the infrared remote control unit 11 is pressed, specifically,
It is a line for sending a buzzer signal according to the operation of the infrared remote control unit 11 and operation data of the rear air conditioner, audio, room lamp, and sunroof to the front seat air conditioner amplifier 1. The second communication line L2 connecting the front seat air conditioner amplifier 1 and the control unit 8 is, as shown in FIG. 2, a clock signal for measuring data detection timing, a latch signal for measuring data acquisition timing, A plurality of lines for communicating remote control data and the like (which will be described later), display data for causing the air conditioner display unit 10b to display the air volume, and a duty signal for variably controlling the brightness of the air conditioner display unit 10b. It is composed by.

The first communication line L1 is a start-stop synchronization type, the data communication specification of the second communication line L2 is the clock synchronization method described in the prior art, and the communication line L2 is a clock signal line. And a latch signal line and a data signal line. In the second communication line L2, the data line in FIG. 4 is the above-mentioned communication line.

When the infrared remote control unit 11 is operated, the infrared remote control unit 11 is operated through the second communication line L2.
Communication data obtained by adding display data for the air conditioner display unit 10b and self-diagnosis data regarding the control system to the remote control data excluding the operation data of the rear air conditioner,
That is, a control command for controlling a plurality of devices is sent to the control unit 8 so that the display operation of the air conditioner display unit 10b and the operation of the sunroof, room lamp, etc. are controlled.

Next, in the present embodiment having the above-mentioned configuration, when the control unit 8 fetches the above-mentioned remote control data and the like from the second communication line L2 by the clock synchronization method, the communication is performed in parallel with the remote control data and the like. The contents of the control process,
Description will be given according to the flowchart shown in FIG. That is, when the control unit 8 starts capturing remote control data and the like, it first determines whether or not the latch signal has been detected (S
1) If it cannot be detected (NO in S1), it is further determined whether or not 1 second has elapsed from the time when the previous latch signal was detected (S2). Here, if 1 second has not elapsed (NO in S2), the process ends as it is. On the other hand, if one second has elapsed (YES in S2), it is determined that the latch signal line is in failure, and the individual data stored in the memory up to that point are canceled (S3), and then the process is terminated.

If the determination result in step S1 is YES and the latch signal can be detected, the clock signal is then detected (S4). Here, if the clock signal cannot be detected (NO in S4), it is determined that the clock line is defective, and the process proceeds to step S3. On the other hand, if the clock signal can be detected (YES in S4), it is further determined whether or not each of the received data, that is, each of the serial data acquired by the clock synchronization method is "ON" (S5). If the result of this determination is YES, it is determined that the data line has failed, and the step S
Go to 3. If the decision result in the step S5 is NO, the acquired serial data is taken in as received data (S6), and the process ends. After that, the control unit 8
Controls the display operation on the air conditioner display unit 10b and the operations of the sunroof, room lamp, etc. based on the received data.

As described above, in the present embodiment,
When the latch signal line or the clock signal line is broken or short-circuited in the first and second communication lines L1 and L2, the remote control data or the like sent to the front seat air conditioner amplifier 1 or the control unit 8 is canceled. Therefore, when the infrared remote control unit 11 is used to open and close the sunroof, the sunroof can be stopped even if a finger is released from the operation button of the remote control unit, even if the communication line failure as described above occurs. It is possible to prevent the occurrence of such a situation from occurring.

Further, even if the data line is short-circuited, the remote control data or the like sent to the front seat air conditioner amplifier 1 or the control unit 8 is canceled, so that the presence / absence of an operation is caused by such a failure of the communication line. It is possible to prevent the occurrence of a situation where the sunroof operates regardless of the situation.

Further, from the above, even when the control system as shown in the present embodiment, that is, the system for controlling the equipment based on the control command sent from the communication line is adopted in the automobile, it has been described above. It is possible to ensure high safety without installing a separate safety mechanism for devices that require safety, such as sunroofs.

[0024]

As described above, in the data communication control device according to the first aspect, when the line for transmitting and receiving the clock signal is short-circuited or disconnected, the communication of an erroneous control command due to it can be prevented. Therefore, by using the data communication control device of the present invention, when adopting a system for controlling a device based on a control command sent from a communication line in an automobile, a malfunction of the device due to a failure of the communication line is prevented in advance. be able to.

[0025] Additionally, in the data communication control device according to claim 2, also In no event the line for transmitting and receiving a latch signal is short-circuited or disconnected, thereby preventing communication of false control command due to it. Therefore, when the system is constructed in an automobile, it is possible to more reliably prevent malfunction of the device due to the breakdown of the communication line.

Further, in the data communication control device according to the third aspect, even if the line for transmitting and receiving data is short-circuited, it is possible to prevent the communication of an erroneous control command due to the short circuit. Therefore, when the system is constructed in an automobile, it is possible to prevent the malfunction of the device due to the failure of the communication line more reliably.

[0027]

[Brief description of drawings]

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

FIG. 2 is a circuit diagram showing a configuration of a first communication line.

FIG. 3 is a flowchart showing the contents of communication control processing performed in parallel with the operation when the control unit fetches remote control data and the like.

FIG. 4 is a timing chart illustrating a method of acquiring communication data according to a clock synchronization method.

[Explanation of symbols]

1 Front seat air conditioner amplifier 8 control unit (data communication control device) 10 Tube light display 16 Sunroof motor drive block 18 room lamp L1 First communication line L2 second communication line

Claims (3)

(57) [Claims] 1. A wired communication line of an automobile, comprising a plurality of lines for transmitting and receiving a latch signal, a clock signal, and data, the data including a control command for controlling another device, The clock signal detecting means for detecting the clock signal, and when the clock signal cannot be detected by the clock signal detecting means, the clock signal is detected from the previous latch signal.
A data communication control device, comprising: first invalidation processing means for invalidating received data stored in a memory while it is detected that the data is not output. 2. A latch signal detector for detecting the latch signal.
The latch signal is output within a fixed time by the output means and the latch signal detection means.
If the previous latch signal is detected,
2. The data communication control apparatus according to claim 1, further comprising: second invalidation processing means for invalidating the received data stored in the memory within a predetermined time . 3. A data inspecting means for inspecting the codes of a plurality of data constituting the received communication data, and invalidating the received data in which all the codes are inspected by this data inspecting means. 3. The data communication control device according to claim 2, further comprising an invalidation processing unit of 3.