JPH0638275A - Controller for electric equipment - Google Patents

Abstract

PURPOSE:To attain a cost effective controller with simple configuration and to attain accurate control even for operation restoration after resetting. CONSTITUTION:The system employing the controller is provided with a transmission node 3 connecting to a momentary switch 2 and generating a control signal in response to the operation of the switch 2, a reception node 5, an actuator 6 connecting to the reception node 5 and switched in response to a control signal from the reception node 5, and a 3rd node 7 connecting to both the transmission node 3 and the reception node 5 via a multiplex communication line 4. In the usual operating state, the transmission node rewrites its function data every time a switching signal from the momentary switch is received. The transmission node in the reset state initializes the function data in the reset state, sets a flag signal A to '1', and rewrites the function data into the content of the function data of the 3rd node and clears the flag signal A. Since the usual operating state is kept so long as a reset is not applied again, the function data are revised in response to the entry from the momentary switch 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical equipment control device for controlling via multiple communication lines.

[0002]

2. Description of the Related Art In controlling electrical components mounted on a vehicle, such as air conditioners and audio equipment,
It has been proposed to use multiple communication lines in order to prevent the harness from becoming large and complicated. For example, JP-A-62-4
Japanese Patent No. 568 discloses a multiplex communication system in which an operation switch and an output device such as various display devices are connected by such a multiplex communication line to perform control.

[0003]

Under such a multiplex communication system, different control signals are sent from a transmitting node to a receiving node by a single communication line. For example, the following device configuration is established as a system using multiple communication lines. When a switching signal is generated by the momentary switch and this switching signal is input to the transmission node, the transmission node sequentially generates a control signal corresponding to control of different contents each time the switching signal is input. This control signal is input to the receiving node via the multiplex communication line and used to control the electrical components.

A problem with such a multiplex communication system is that, for some reason, for example, during cranking,
A problem arises when the power supply voltage drops causing the transmitting node or the receiving node to go down and be reset. That is, in such a system, since signals relating to different control contents are transmitted by a single communication line, if the previous state is erased by reset, it is unclear which control state should be set at the time of operation recovery. Therefore, at the time of restoration, the target electrical component may be in an operating state against the intention of operating the switch. Providing a mechanism for storing the state before resetting in each node as a countermeasure against this complicates the system and is disadvantageous in terms of cost.

Therefore, the present invention provides an electrical equipment control device using a multiplex communication system which has a simple structure and is therefore advantageous in terms of cost, and which can perform accurate control even after operation reset after reset. The purpose is to do.

[0006]

In order to solve the above problems, the present invention is configured as follows. An electrical component control device according to the present invention includes a first node that receives a switching signal and a second node that is connected to the first node via a multiplex communication line.
A node, an output device connected to the second node and operated by a control signal from the second node, and the first node sequentially generates different control signals each time the switching signal is input, Based on a signal from the first node, the second node operates the output device according to the control content corresponding to the signal, and when the first node is in the reset state, the first node Further includes a third node for storing the control signal generated immediately before the control signal is reset to the reset state, and the third node stores the control signal stored when the reset of the first node is released and the operation is restored. It is designed to notify one node.

In another aspect of the present invention, the third node stores the control signal generated by the first node immediately before the first node enters the reset state when the second node enters the reset state. In this case, when the reset of the second node is released and the operation is restored, the control signal stored immediately before the reset is notified to the first node.

It should be noted that this third node is preferably unaffected by a change in state such as a decrease in power supply voltage, as in the case where the third node has its own power supply circuit or a non-volatile memory. It is configured. This third
It is sufficient to provide one node in the control device.

[0009]

According to the present invention, the first node, that is, the transmitting node is connected to the means for generating a switching signal such as a momentary switch. The first node generates a different control signal each time the switching signal is input. The control signal generated at the first node is sent to the second node, that is, the receiving node, via the multiplex communication line. The second node is connected to an output device which is a control device such as an electrical component, and outputs a control signal from the first node to the output device to control the output device.

In this case, the control signal generated at the first node changes every time the switching signal from the momentary switch is input. As a result, the control signal received by the second node also changes, and the control content of the output device changes accordingly. The device of the present invention further stores a state immediately before resetting when the first node or the second node is reset due to a voltage drop or the like, that is, a signal relating to the control content last effectively communicated in the multiplex communication line. It has a node. When the reset state of the first node or the second node is released and the third node returns, the third node generates an output for notifying the first node of the content or state of the stored control signal. This makes it possible to recognize from which control state the entire control system of the electrical component should be restored. Therefore, when the switching signal is input to the first node via the momentary switch after the return, it can be appropriately processed as a control state immediately before the reset.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, the electrical component control device 1 according to the present example is connected to a momentary switch 2 that generates a switching signal each time it is operated, and a transmission node 3 that generates a control signal according to the operation of the switch 2, The transmitting node 3
To the receiving node 5 which receives the control signal from the transmitting node 3 and is connected to the receiving node 5 via the multiplex communication line 4 and the ventilation guide of the air conditioner according to the control signal from the receiving node 5 ( An actuator 6 for switching the direction (not shown), and a third node 7 connected to both the transmitting node 3 and the receiving node 5 via the multiplex communication line 4 are provided.

Referring to FIG. 2, the momentary switch 2 generates a switching signal having one pulse for each operation. As a result, the transmission node 3 outputs a control signal for switching the actuator 6. The receiving node 5 outputs a control signal to the actuator 6 based on the signal from the transmitting node 3. The actuator 6 operates based on the control signal from the reception node 5, and switches the direction of the ventilation guide of the air conditioner to the recycling state in which the air inside the vehicle is circulated or the fresh state in which the outside air is introduced.

As shown in FIG. 3, the function data constituting the control signal from the transmitting node 3 transmitted by the multiplex communication line 4 includes, for example, a start message 8, a signal priority 9, a signal type 10, and a transmission. It includes information such as data 11, data abnormality check 12, data end message 13, approval 14 and end message 15.

When the power supply voltage of the transmitting node 3 or the receiving node 5 is lowered to enter the reset state in the engine cranking state or the like, the third node 7
Stores the control signal immediately before reset. The sending node 3, the receiving node 5 and the third node 7 preferably comprise a controller (not shown) having a microprocessor and a memory. The specific hardware configurations of these are well-known contents and do not constitute a part of the contents of the present invention, and therefore detailed description thereof will be omitted.

As shown in FIG. 4, the controller of the transmitting node 3 rewrites the function data every time the switching signal from the momontum switch is input in the normal operating state. That is, in this example, the direction of the ventilation guide is changed to the recycled state or the fresh state.
Change the function data indicating the control content for switching via.

When a reset state is brought about due to a power supply voltage drop or the like during cranking as described above, the function data, which is the content of the signal indicating the control state at the time of reset, is returned to the initial value (in this example, in this example). Fresh state). Then, the reset flag signal A indicating that the reset has occurred is set to 1. On the other hand, as shown in FIG. 5, in the normal operating state, the third node 7 receives from the transmitting node 3 the function data that changes with each operation of the momentum switch 2 when the reset flag signal A of the transmitting node 3 is 0. And rewrite. And the third
When the node 7 is being reset, the function data is set to the initial value (fresh state) as in the transmitting node 3. Then, the reset flag signal B indicating that the reset is applied is set to 1. Therefore, when the transmission node 3 is reset, the correspondence of the transmission node 3 differs depending on whether the third node 7 is in the reset state or not. When the third node 7 is reset, that is, the reset flag signal B
When is 1, the transmitting node maintains the state in which the functional data is set to the initial value and sets the flag signal A to 0. When the third node 7 is not reset, that is, when the reset flag signal B is 0, the function data in the transmitting node is rewritten to the content of the function data of the third node. Then, the flag signal A is set to 0. After that, the function data is changed according to the input from the momentary switch 2 since it is in a normal operating state unless reset again.

When the receiving node 5 is reset, the same processing is performed as when the transmitting node 3 is reset. In this case, the functional data of the receiving node 5 is rewritten according to the contents of the transmitting node 3 when the reset flag signal A of the transmitting node 3 is 0. When the reset flag signal A of the transmitting node 3 is 1, it is determined that the transmitting node 3 has not yet returned to the normal state after being reset, and therefore the functional data is not rewritten.

In this case, as described above, the transmitting node 3
Is returned to the normal operating state by the signal from the third node 7 and the reset flag signal A of the transmitting node 3 is set to 0, whereby the receiving node 5 is returned to the normal state. By so doing, control is not confused even if transmission, reception, or reset of the third node 3, 5, 7 is applied.

In this example, the function data has a content of switching between two types of control, that is, the recycle state and the fresh state of the air conditioner, but the present invention is not limited to this, and it is also possible to control three or more states or controls. It can be applied similarly.

[0020]

According to the present invention, even if an abnormality occurs in the multiplex communication system that transmits the control data from the transmitting node to the receiving node with a simple configuration by using the multiplex communication line, the operation switch switching signal is used. Corresponding and appropriate control of electrical components can be performed. That is, in the present invention, it suffices to provide one third node for the multiplex communication system, and it is not necessary to incorporate a monitoring device in each of the transmitting node and the receiving node.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a device configuration of an electrical component control device according to an embodiment of the present invention,

FIG. 2 is an explanatory diagram showing a relationship between a signal of a mormon-tam switch and a signal generated by a transmission node,

FIG. 3 is an explanatory diagram showing the contents of functional data,

FIG. 4 is an explanatory diagram showing the processing content of a transmitting node,

FIG. 5 is an explanatory diagram showing the processing content of a third node.

[Explanation of symbols]

1 Electrical equipment control device, 2 Momontum switch, 3
Sending node, 4 multiplex communication line, 5 receiving node, 6
Actuator, 7 Third node.

Continuation of the front page (72) Inventor Yasuhiko Kurata 3-3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Nardeck Co., Ltd.

Claims (2)

[Claims] 1. A first node for receiving a switching signal,
A second node connected to the first node via a multiplex communication line, an output device connected to the second node and operated by a control signal from the second node, and the first node outputs the switching signal. An electrical device that sequentially generates a different control signal each time it is input, and the second node operates the output device with the control content corresponding to the signal based on the signal from the first node. A product control device,
And a third node that stores a control signal generated immediately before the first node enters the reset state when the first node enters the reset state. An electrical component control device, wherein the stored control signal is notified to the first node when released and returned to operation. 2. A first node for receiving a switching signal,
A second node connected to the first node via a multiplex communication line, an output device connected to the second node and operated by a control signal from the second node, and the first node outputs the switching signal. An electrical device that sequentially generates a different control signal each time it is input, and the second node operates the output device with the control content corresponding to the signal based on the signal from the first node. A product control device,
And a third node that stores a control signal generated by the first node immediately before the first node enters the reset state when the second node enters the reset state. An electrical component control device, wherein the stored control signal is notified to the first node when the reset of the node is released and the operation is restored.