JPH0477519B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex signal transmission system, and more particularly to an integrated wiring system suitable for integrating wiring within an automobile.

[Conventional technology]

Automobiles are equipped with a large number of various electrical components such as various lamps, motors, sensors, etc., and the number of these components continues to increase.As a result, the wire harnesses that connect these electrical components The bundles of electric wires called wires are also becoming larger and more complex, which is causing various problems such as deterioration in productivity, ease of installation, increase in cost, and decrease in maintainability.

Another problem is that this wire harness is susceptible to induced noise, which can easily cause malfunctions.

Therefore, as one method to solve these problems, various integrated wiring systems have been proposed that apply multiplex transmission technology and can transmit a large number of signals with a small number of wires. Optical fiber cables, which are lightweight and non-inductive, are often used as cables. In addition, as such an integrated wiring system, for example, JP-A-57-
Publication No. 171852 can be mentioned.

By the way, cars have electrical components such as parking lights that must be controlled even when the car is parked and the engine is stopped.

Therefore, when an integrated wiring system is adopted, it is necessary to keep this system in operation even when the engine is stopped.

However, if the central wiring system is kept in continuous operation even when the engine is stopped while the car is parked, the battery may discharge too much and the engine may stop working when the car is parked for a long time. A problem arises in that it becomes impossible to start.

Therefore, in order to eliminate this problem, a method of controlling the power supply of an integrated wiring system by opening and closing an ignition switch has been proposed, for example, in
This is proposed by Publication No. 153853.

[Problem that the invention seeks to solve]

However, in the above conventional technology, a separate gate circuit is used for the parking lamp switch, etc., wiring is provided independent of the transmission line, and power supply is controlled only by the ignition switch. However, there was a problem in that the advantages of introducing an integrated wiring system, which was aimed at reducing the number of wiring lines and downsizing the system, could not be fully exploited.

The present invention was made against the above-mentioned background, and its purpose is to sufficiently reduce power consumption even when the engine is stopped, such as when parking, without using separate wiring.・Providing an integrated wiring system that allows control of lights, etc.

[Means for solving problems]

The above purpose is to maintain the transmission function for a specific terminal control device among the transmission functions between the central control device and the terminal control device, regardless of the presence or absence of power supply to the entire centralized wiring system. This is achieved in this way.

[Effect]

Even if the power supply necessary for the operation of the entire centralized wiring system is cut off, the data transmission function between a specific terminal control device and the central control device is maintained. By connecting things like parking light switches to the control device, you can always maintain control over the necessary electrical components while sufficiently reducing power consumption in standby mode.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the integrated wiring system according to the present invention will be explained in detail with reference to illustrated embodiments.

First, FIG. 2 shows a central control unit (hereinafter referred to as CCU) 1 and a terminal control unit (hereinafter referred to as LCU) 30 in an embodiment of the present invention.

The CCU 1 is equipped with a microcomputer 5 because it requires a high degree of judgment processing ability. And signal transmission control circuit (hereinafter referred to as CIM)
6 has a function of serially converting the control data generated by this microcomputer 5 and transmitting the same;
Receives serially transmitted monitor data,
It has the functions of synchronizing, detecting transmission errors, performing parallel conversion, and outputting an interrupt request signal to the microcomputer 5 to notify the completion of data reception.

8 is an analog switch, which is the transmission partner.
This is for selecting LCU.

21, 22, 23 are photoelectric converters, LCU
There are only as many pieces as there are.

Furthermore, 9 is a memory device for storing data.

On the other hand, LCU30 includes photoelectric converter 24, CIM7,
It is composed of an input/output interface 4, an A/D converter 3, etc., and receives control data for lamps, motors, etc. among various electrical components (external devices) 111, 112 installed in the automobile.
Hereinafter, output devices are used to send control data to electrical equipment that generates data such as switches, etc.
Hereinafter, monitor data will be taken in from what is referred to as an input device. At this time, the A/D converter 3 is used to take in data from input devices 121 and 122 that generate analog data, such as a temperature sensor. Furthermore, as described later, this CIM
It is used in both the CCU and the LCU, and is an important component in this embodiment.

The CCU 1 and each LCU 30 are connected by an optical fiber cable 2, so that data can be exchanged using optical signals.

An example of CIM is shown in FIG. This CIM can be roughly divided into a control section and an interface section. There are a register 64, an A/D converter control circuit 65, and an input/output buffer 66.

The synchronization circuit 61 receives the received data on line 69.
This is the part that synchronizes the clocks within CIM.

The control circuit 62 controls the shift operation of the shift register 64, transmission error control, etc.

The address comparator 63 compares the address included in the received data with the one given from line 67.
It checks whether the received data is for itself by comparing it with the address assigned to the CIM.

By the way, this CIM in Figure 3 shows the case where it is used on the LCU side, but this CIM is
It has a bit address input 67 and a 2-bit mode input 68, and by combining these, it can be used in various ways. First, when the address is S|0, it can be used to connect to a microcomputer. If the address is other than S|0, it becomes LCU mode for use on the LCU side. And in case of LCU mode,
Further, the mode input 68 causes the mode to be set to S|0,
When S|1 is used, it is used as PASSIVE mode, that is, a mode in which data is sent only in response to receiving data, and when the mode is S|2, S|3, it is used as ACTIVE mode, that is, even when no data is received. Used as a mode in which data can be sent.

FIG. 4 shows the state transition of the CIM in the PASSIVE mode, and FIG. 5 shows the state transition of the CIM in the ACTIVE mode, and the operation in both modes will be explained below with reference to these figures.

First, in the case of PASSIVE mode in Figure 4,
The reset puts it into an idle state, that is, a state where it is waiting to receive data. When data is received here, it shifts to the receiving state. Transmission error detection is performed during reception, and if an error is detected, the device returns to the idle state and waits for reception again. If there is no error, the state will go through the zero transmission state and then the transmission state will be sent, and the reply data will be sent to the CCU.
and returns to the idle state, completing one transmission.

On the other hand, in the ACTIVE mode CIM shown in Figure 5,
In addition to the state transition of the CIM in PASSIVE mode, there is a transition from the idle state to the zero transmission state,
After remaining in the idle state for a certain period of time, it transitions to the zero transmission state and starts transmitting data. The amount of time it can remain idle is determined in hardware by a timer within the CIM.
CIM in PASSIVE mode and CIM in ACTIVE mode
When connected, both CIMs become idle due to reset, but at some point the ACTIVE mode CIM starts transmitting, so the PASSIVE mode CIM
also enters the receiving state, and data transmission begins between both CIMs.

Next, FIG. 1 shows an embodiment of the present invention, which is described above.
Power supply control is performed using one-to-one transmission between CIMs.

When the entire integrated wiring system is operating, the microcomputer 5 is connected to the CIM 6 through the data selection circuit 10, and the LCU 3
0, 40, etc. are being transmitted. In addition, for this microcomputer 5, for example, the model name
A CMOS device such as the one known as HD6301V, which has a standby mode function with low current consumption, and is equipped with input/output ports is suitable.

The output of the output port Po is used for power control by the microcomputer 5, and during normal operation, the output port Po is set to "H" level. That is, this causes the transistor 14 to
Since it becomes ON state, relay 11 operates and V _LCU
is given battery voltage _VB , which supplies operating power to the entire system.

Reference numerals 12 and 13 indicate voltage regulators for generating a voltage of 5 volts, which are used as power supplies for logic circuits.Of these, the output of voltage regulator 12 is always 5 volts, but the output of voltage regulator 13 is , is controlled by the output port Po of the microcomputer 5.

In the data selection circuit 10, when the selection input S is at "H" level, ports X and Xo are connected,
In the case of "L" level, it operates so that ports X and _X1 are connected.

The LCU 30 includes input devices 301 to 303 (111, 112 in FIG.
) is connected to the CCU
1, the microcomputer 5 reads the states of these input devices 301-303. When these input devices 301 to 303 remain in the OFF state for a predetermined period of time, the microcomputer 5 switches to the output port.
Set Po to “L” level.

As a result, the transistor 14 becomes OFF, the contacts of the relay 11 are separated, and the output of V _LCU and the voltage regulator 13 is no longer output, and the specific LCU
Except for LCU 30, power to other LCUs 40 and the like is cut off. And with this, in CCU1,
Since the selection input S of the data selection circuit 10 becomes "L" level, X and _X1 are connected, and the microcomputer 5 is separated from the CIM 6. Also,
In CIM6, address input Ao changes from “L” to “H” level, and mode input _M1 changes to “L”.
As a result, as explained in Fig. 3, this CIM6 changes from MPU mode to LCU mode and ACTIVE mode.
Transmission starts from CIM6 (see Figure 5), and CIM6
The transmission function is maintained only between the LCU 30 and the LCU 30.

Therefore, by maintaining this transmission function, CIM
The states of the input devices 301 to 303 transmitted to _X1 of the data selection circuit 10 are input to the NAND gate 18.

Therefore, when all of the input devices 301 to 303 are OFF, the "H" level is output to _X1 of the data selection circuit 10, so the output of the NAND gate 18 becomes "L" level, and the OR The output of the gate 17 also goes to the "L" level, and the standby input of the microcomputer 5 goes to the "L" level, so the microcomputer 5 enters the standby mode. Note that in standby mode, almost no current consumption flows. Also, at this time, the reset input _es is kept at the "H" level.

Next, in order to return from the standby mode to the operating state, the standby input is set to the "H" level and a reset is applied from the reset input _es .

Therefore, when any of the input devices 301 to 303 turns on, one of the inputs of the NAND gate 18 goes to "L" level, so its output goes to "H" level, and the output of OR gate 17 goes to "L" level. also becomes “H” level. Further, the input of the reset circuit 16 also goes to the "H" level, and outputs a reset signal consisting of a negative pulse. As a result,
Microcomputer 5 has standby input
As STBY goes to "H" level and a reset signal is input, it switches to the operating state, "H" level is output to output port Po, power is supplied to each part, and the entire integrated wiring system is activated. starts working.

FIG. 6 is a flowchart showing the flow of the operation of the microcomputer 5, which starts operation upon reset.

Therefore, when a reset is applied, first 16
Initialize memory and various flags with 0.

Here, normally the processes 161 to 165 are repeatedly executed. In other words, it transmits signals to each LCU and controls lamps according to the status of switches and sensors. Processes 164 and 165 are data processing and transmission control parts, and the other parts are power control parts.

The procedure from the operating state to the stopped state by cutting off power will be explained. When all of the input devices 301 to 303 related to power control are turned off, it is detected in process 161 and the process branches to process 168. During operation, the value of ST (status flag) is 1, so the process branches to process 180, sets the value of ST to 0, delays 100 milliseconds in process 181, and returns to process 161. . Even at this point, if the input devices 301 to 303 are OFF, processing 168,
It branches to 169 and outputs "L" to port Po.

In this way, when port Po becomes “L” level,
As described in the explanation of FIG. 1, the hardware opens the contacts of the relay 11 to cut off the power supply to the LCU 40, and
STBY becomes "L" level, and the microcomputer 5 enters a standby state (standby mode).

Note that the 100 millisecond delay in process 181 was provided to eliminate the influence of chattering on the input devices 301 to 303;
This is to start power control after the states 01 to 303 are stabilized, and the delay time of 100 milliseconds is just an example.

Next, a procedure for moving from the standby state to the operating state will be explained. As mentioned in Figure 1,
The microcomputer 5 is started by the reset, so the process is the same as when turning on the power.
Initialization is performed in step 160, and the process moves to decision branch processing in step 161. Here, for now, the input device 301~
Since it is assumed that one of 303 is ON, the process branches to 162. Since ST is set to 0 at 160, branch to 166, set ST to 1,
After 100 milliseconds have elapsed, the process returns to 161. Next time,
Since the value of ST is 1, move to 163 and port
Output “H” from Po. When “H” is output to port Po, the contacts of relay 11 close, so
Power is supplied to the entire system including LCU40,
Furthermore, microcomputer 5 and CIM 6 are connected, and signals can be transmitted with each LCU.
Transmission is performed by processing 164 and 165. Processing 167 is for chattering countermeasures, similar to the processing 181 described above.

Therefore, according to this embodiment, the specific LCU3
When all of the input devices 301 to 303 connected to CCU1 are turned off, it switches to a standby state, and CCU1
In this case, the microcomputer 5 is put into a low gravity consumption state, and all the remaining LCUs (for example, 40) are turned off except for this particular LCU 30, so there is no risk of battery damage even when the car is parked for a long time.
What's more, you can reliably control things like parking lights at all times.

〔Effect of the invention〕

According to the present invention, the entire system switches to a standby mode with low power consumption depending on the state of a specific input device, so power consumption can be significantly reduced while maintaining sufficient capacity for necessary control functions. When applied to automobiles, it is possible to prevent battery build-up during parking, etc., and to fully utilize the advantages of an integrated wiring system.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the integrated wiring system according to the present invention, Fig. 2 is a block diagram showing the general configuration of the integrated wiring system, and Fig. 3 is a block diagram showing an example of the signal transmission control circuit. , FIGS. 4 and 5 are state transition diagrams of the signal transmission control circuit, respectively, and FIG. 6 is a flowchart for explaining the operation of an embodiment of the present invention. 1...Central control unit (CCU), 2...Optical fiber cable, 5...Microcomputer, 6,
7... Signal transmission control circuit (CIM), 8... Analog switch, 10... Data selection circuit, 11...
Relay, 12, 13... Voltage regulator, 16
...Reset circuit, 30...Specific terminal control device, 40...Terminal control unit (LCU), 301-3
02...Input device.

Claims (1)

[Scope of Claims] 1. A central control unit that collects and processes monitor data and creates and transmits control data under computer control; and a central control unit that receives and outputs the control data to external equipment; In an integrated wiring system comprising a plurality of terminal control devices that transmit data inputted from the terminal as the monitor data, and a multiplex electrical circuit connecting the plurality of terminal control devices and the central control device, the plurality of terminals Means for controlling supply interruption of operating power to terminal control devices other than the specific terminal control device to which the input device for power control is connected among the control devices; Means for detecting an on/off change in data by an external device, and means for detecting an on/off state of data by the external device for power control after a predetermined period of time has elapsed from the time when this on/off change is detected, are provided, and the power control is performed by: Only when the data on/off state of the external device continues for a predetermined period of time, the supply of operating power to terminal control devices other than the above-mentioned specific terminal control device is controlled to be cut off in response to the on/off state. Features an integrated wiring system. 2. The integrated wiring system according to claim 1, wherein at least one of the power control input devices connected to the specific terminal control device is an ignition switch of an automobile. 3. In claim 1, the computer included in the central control device is comprised of a microcomputer with a standby operation function, and the computer is configured to operate from a power control input device connected to the specific terminal control device. What is claimed is: 1. An integrated wiring system characterized in that the integrated wiring system is configured to enter a normal operating state only when data in an on state continues for a predetermined period of time.