JPS63262995A - Power control system for concentrated wiring system - Google Patents

Abstract

PURPOSE:To suppress a power consumption in a terminal station by supplying the power required for the operation of the entirety of the terminal station only while a transmission between a central station and a terminal station is repeated and stopping the transmission of a signal from the central station during a parking. CONSTITUTION:One central station (CCU) 1 and the plural terminal stations (LCU) 30, 40 are included. A silence signal detecting circuit 10 and a power control circuit 11 control a power supply in the LCUs 30, 40, the silence signal detecting circuit 10 monitors a transmission path to monitor the presence and the absence of a signal and the power control circuit 11 disconnects or connects the power supply to the prescribed part in the LCU 30. When it is not required to operate a concentrated wiring system such as at the time of the parking, only a minimum part is operated and other part is stopped. Thereby, the consuming current at the time of the parking or the like is completely suppressed to a low value.

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 devices continues to increase.As a result, the wire harnesses that connect these electrical components Bundles of electric wires, also known as electric wires, are becoming larger and more complex, leading to various problems such as deterioration in productivity, ease of installation, increase in cost, and decrease in maintainability. ing.

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

Therefore, one way to solve these problems is to
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.In this case, optical fiber, which is lightweight and non-inductive, is used as the transmission path. Cables are often used. In addition,
As such an integrated wiring system, for example,
No. 7-171852, etc., there are electrical components such as parking lights in automobiles that must be controlled even when the engine is stopped when the vehicle is parked.

Therefore, when an integrated wiring system is adopted, this system must be kept in operation even when the engine is stopped.

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

In order to eliminate this problem, a method of controlling the power supply of the integrated wiring system by opening and closing an ignition switch has been proposed, for example, in Japanese Patent Laid-Open No. 153853/1983.

[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. The purpose of this system was to reduce the number of wiring lines and make it more compact, and there was a problem in that the benefits of introducing an integrated wiring system could not be fully exploited.

The present invention was made against the above background, and its purpose is to sufficiently suppress power consumption even when the engine is stopped, such as when parking, without using separate extracted wiring. The object of the present invention is to provide a power control method for an integrated wiring system that enables control of parking lights, etc.

[Means for solving problems]

The above purpose is to monitor the signals on the transmission path at the terminal, and maintain the power supply necessary for the operation of the entire terminal only while the signal transmission is repeated at a predetermined frequency. It is achieved by

[Effect]

The power necessary for the operation of the entire terminal unit is supplied only while transmission is repeated between the central station and the terminal unit, so it is difficult to transmit signals from the central station while the unit is parked. By discontinuing this, power consumption at the terminal unit can be sufficiently suppressed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power control method for an integrated wiring system according to the present invention will be described in detail below using illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, in which one central station c and below, C
It includes a CU) 1 and a plurality of terminal units C and below, LCU and CU) 30.40.

The CCUI selects one from a plurality of LCUs 30, 40, etc., and selects electrical components 121, 122, etc., such as lamps, connected to that LCU (for example, LCU 30).
Send data to control... Therefore, this LCU 30 uses the electrical components 12 according to the received data.
1, 122, . . . and transmits the status of electrical components 111, 132, . . . such as switches as reply data. The CCUI collects the states of switches and sensors, and generates and sends control data by sequentially performing such signal transmission with each terminal unit.

As is clear from the above, the C'CUI is equipped with the microcomputer 5 because it requires a high degree of judgment processing ability. The signal transmission control circuit (hereinafter referred to as CIM) 6 has the function of serially converting and transmitting the control data generated by the microcomputer 5, and receiving and synchronizing the serially transmitted monitor data.
It has a function of detecting a transmission error, performing parallel conversion, and outputting an interrupt request signal to notify the microcomputer 5 of completion of data reception. As will be described later, this CIM is used in both the CCU and the LCIJ, and is an important component in this embodiment.

8 is an analog switch for selecting an LCU to be a transmission partner.

21, 22, and 23 are photoelectric converters, the number of which is the same as the number of I and CU.

Furthermore, 9 is a memory device for storing data.

On the other hand, the LCU 30 is composed of a photoelectric converter 24, a CIM 7, an output interface 3, an input interface 4, a no-signal detection circuit 10, and a power control circuit 11, and is used for various electrical components (external devices) installed in the automobile. 111
~122, electrical components that receive control data such as lamps and motors (hereinafter referred to as output devices), and electrical components that generate data such as switches;
Hereinafter, monitor data will be taken in from what is referred to as an input device. At this time, data is taken in from input devices 121 and 122 that generate analog data, such as a temperature sensor, using an A/D converter (described later).

Note that the no-signal detection circuit 10 and the power control circuit 11 are LCU
Among these, the no-signal detection circuit 10 monitors the transmission line to see if there is a signal, and the power control circuit 11 controls the power supply to a predetermined part in the LCU 30. or to make an investment;
The details will be described later.

Optical fiber cable 2 is installed between the CCUI and each LCU30.
The data is sent and received using optical signals.

An embodiment of the CIM is shown in FIG. This CIM can be roughly divided into a control section and an interface section, and the control section includes a synchronous circuit 61. There are a control circuit 62 and an address comparator 63, and the interface section includes a shift register 64 for sending data to a line 70 and an A/D converter control circuit 65.
, an input/output cover 766.

The synchronization circuit 61 is a part that synchronizes the clock in the CIM with the received data on the line 69.

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 address assigned to the CIM given from the line 67 to check whether the received data is for itself.

By the way, the CIM shown in FIG. 2 is used on the LCU side, but this CIM has a 4-bit address input 67 and a 2-bit mode input 68. These combinations allow various uses. First, when the address is O, it becomes an MPU mode that can be connected to a microcomputer and used on the CCU side, and when the address is other than O, it is used on the LCU side. It becomes LCU mode for

Next, FIG. 3 shows an embodiment of the no-signal detection circuit 10 and the power control circuit 11 in FIG. 1, which will be described in detail below with reference to this diagram.

In this third diagram, reference numeral 12 is a retriggerable monostable multivibrator, which uses, for example, HD 14538 B known as CMO8 standard IC, and among its human power A%B and C, input B .

If C is set to H'', when the input A goes from L'' to 6H'', the output Q will be set to 'H'' for a time determined by externally connected C and R.

Then, when the input A changes from "L" to "H" again while the output Q is "H", retrieval is performed, and the output Q changes from "L" to "l Hl". 1H'' is maintained from the time until the time determined by C and R.

Therefore, if the external C and R are selected so that the stabilization time of the monostable multivibrator 12 is longer than the maximum value of the interval between signals sent through the photoelectric converter 24, the integrated wiring system can be improved. During operation, the output Q of the monostable multivibrator 12 is kept at H'', and therefore, this output Q can be used to control the power of the terminal section. Q is 'H''
When this is the case, the output of the OR gate 17 also becomes "H", so the transistor 14 is turned on and the relay 13 is turned on.
operates, the output Out of the constant voltage circuit 16 becomes 5 ports, and the LCU 30 becomes fully operational.

By the way, the other input of the OR gate 17, that is, CIM
7 output Q. is used when cutting off the power to the LCU 30, and the reason for this configuration is as follows. That is, the output Q of the monostable multivibrator 12
In any case, if the received signal is interrupted for whatever reason, it becomes 'L'. Therefore, if this output Q is used to cut off the power of the LCU 30,
While the car is running, the lights may suddenly go out or the engine may stop, which is extremely dangerous. In such a case, the electrical components become uncontrollable, so it is necessary to control them in a safe direction, so the LCU3
0 must be supplied with power.

Therefore, in this embodiment, the CCUl constantly monitors the status of switches necessary to control power such as the parking lamp switch, ignition key switch, and door switch, and checks whether all of them are off. In response, the CIM7 outputs 1L" at the output Q0 of the CIM7 when all of them are off, and '1L" when any of them is on. It is designed to output H''.

FIG. 4 shows the operation of the circuit of FIG. 3. When the output of the constant voltage circuit 16 is not output, that is, when the LCU 30 receives a signal from the stopped state, the output Q of the monostable multivibrator 12 becomes 6I-('', and 5 volts are output from the output of the constant voltage circuit 16. The entire LCU 30 becomes operational.

On the other hand, when one of the switches for power control is turned on, the output Q of CIM7 is changed according to the data from CCU1. becomes 1H''. This state is when transmission is normally performed.

Next, when parking, etc., all power control switches are turned off, and the output Q of CIM7. becomes L''. Therefore, if the CCUI stops transmitting in this state, the output Out of the constant voltage circuit 16 will no longer be output, and the LCU 30 will be in a stopped state. Then, in the LCU 30 in this stopped state,
Only the monostable multivibrator 12 and OR gate 17 are operating, so if there is a transmission from the central station, the LCU
30 is ready for operation and can monitor the status of the switch.

Therefore, according to this embodiment, when parking, etc., the LCU
The power consumption can be suppressed to a sufficiently low level, and it can also sufficiently respond to changes in the state of switches and the like.

Furthermore, according to this embodiment, the QL and output of the CIM 7 are used as flags, and power supply control in the LCU 30 is obtained depending on the state.
Even when transmission of 1 is stopped, the control state of the electrical components is maintained as before, and sufficient fail-safety can be maintained.

In the embodiment shown in Fig. 3, a monostable multivibrator 12 and a relay 13 are used, but the same function can be obtained by using non-contact switching elements such as a counter with a reset function, an RS latch, and a transistor. can be fulfilled.

〔Effect of the invention〕

According to the present invention, when the centralized wiring system does not need to be in operation, such as when parking, power control is performed to operate only the minimum part and stop the other parts. Current consumption during parking etc. is kept to a sufficiently low level.
This has the effect of preventing battery drain and realizing a practical integrated wiring system.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the power control method of the integrated wiring system according to the present invention, Fig. 2 is a block diagram showing an embodiment of the signal transmission control circuit, and Fig. 3 shows the no-signal detection circuit and the power FIG. 4 is a time chart for explaining the operation of an embodiment of the control circuit. 1... Central office (CCU), 2... Optical fiber cable, 6, 7... Signal transmission control circuit (CIM'), IO... None Signal detection circuit, 11
...Power control circuit, 30°40...Terminal section. ′! A1 Figure 1 Central office (CCU) 30.40-M (
LCLI) 2 Optical fiber 6.7
Confirmation delivery - vJ Hinoki ■ Ichisuke 21-24 ￥h ((JM
) Figure 2

Claims (1)

[Claims] 1. A device comprising a plurality of terminal units connected to a central station via a signal transmission path, and capable of transmitting signals sequentially and intermittently at a predetermined cycle by specifying a destination from the central station. In an integrated wiring system that performs multiplex transmission based on the half-duplex transmission function obtained when one of the corresponding terminal units responds and transmits a signal, the signal transmission from the central station is At least one of the terminal sections is provided with a monitor means for constantly monitoring and a power supply control means operated by the output of the monitor means, and the supply of power to a predetermined portion of the terminal section other than the monitor means is controlled by the power supply control means operated by the output of the monitor means. A power control method for an integrated wiring system, characterized in that the power control method is configured to be performed by a supply control means. 2. In claim 1, the power supply control means operates under an OR condition between a state of a flag controlled by a signal from the central station and a state of the output of the monitor means. A power control method for an integrated wiring system characterized by comprising: