Method and apparatus monitoring activation of subordinate lin network blocks by analysing activation reasons

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to monitoring activation of subordinate blocks of LIN networks. The device (D) is designed to monitor activation of subordinate blocks (OE1-OE5) of a multiplexed LIN communication network (R) controlled by a driving block (OM). The device (D) is designed such that when the driving block (OM) detects activity in the network (R) during a standby phase, i) it instructs the driving block (OM) to transmit to at least some subordinate blocks (OE1-OE5) and preferably to all blocks, which can be a source of an activation request, request messages to which they must respond via a response message containing a status field, the value of which characterises a local or non-local source of the detected activity, ii) analyse the value of the status field of each response message received by the driving block (OM) in order to determine if at least one subordinate block is a source of activity and if so, whether said activity is justified with respect to the corresponding value of the status field, and iii) allow the driving block (OM) to acknowledge activation of subordinate blocks only if the activity is justified.

EFFECT: preventing activation of subordinate blocks of a LIN network if the source of an activation request is interference.

13 cl, 2 dwg

 

The present invention relates to multiplex communication networks type LIN (Local Interconnected Network, a local area network interconnects), which are used, in particular, in vehicles (particularly in cars), and, in particular, concerns the control of the activation of the subordinate units of such networks LIN.

In this case, "multiplex communication network type LIN" shall mean the communications network containing the bus, which is connected to control unit called master unit (or node), and functional units called subordinate units (or nodes). Driver unit is designed, in particular, for the management of translations in the standby mode, and the activation of the subordinate units of its network LIN.

As we all know when subordinate units network LIN transferred to the idle state (on-demand setting body), they are automatically activated when they detect activity on their bus. This activity is based on the subordinate unit that requests the activation of other units of its network LIN, or from the master unit.

Believe that the bus is active, when you can find the so-called transition recession-dominated, followed by the dominant state in a period of time exceeding the threshold. Dominant state (or "logical " low") is an electric network level, with the criterion of logical "0". As for the recessive state (or "logical high"), it is an electric network level corresponding to logic "1". The logic level "0" is called a dominant level, as it is a priority when multiple subordinate units you intend to specify different levels. Therefore, any arbitrary or involuntary (interference) action causing transition recession-dominated, followed by the dominant state in a period of time exceeding the threshold, perceived unit as the activity, which should lead to its activation.

According to the LIN standard, when the driver unit detects activity on the bus its network LIN, he must determine whether any subordinate unit of this network is the source of this activity. However, the LIN standard does not define the subsequent procedure.

If none of the slave unit is not the source of the request for activation (interference), therefore, the activation is not justified, and in the case of serial unnecessary activations battery (if we are talking about the vehicle (in particular, car)) may be discharged.

The present invention is the correction of this situation and, in particular, management phases confirm activation regardless of the application program on the same level as upravleniemoeda network phases.

In this regard, an object of the invention is a method designed to control the activation of the subordinate units multiplex communication network type LIN-driven master unit, whereby, when the driver unit detects activity in the network during the phase out:

i) at least some of the subordinate units (and preferably on all blocks, which can be the source of the request for activation and, consequently, the detected activity) send a special request message to which they must respond with a reply message containing a status field whose value characterizes a local or nonlocal source detected activity, then

ii) analyze the value of the status field of each message from the reply adopted by the specifying unit to determine whether at least one slave block the detected activity, and in case of confirmation, whether this activity relative to the corresponding values of the status field, and

iii) authorize the activation of the subordinate units, only if the detected activity is justified.

In addition, each response message contains a status field, which value may, for example, to characterize local or non-local source detected activity, and with whom the learn local source - event type, locally called the activity detected.

In addition, the phase iii) in the absence of justification detected activity driver unit may, for example, to instruct subordinate units to return to the idle state.

In addition, phase i) (subject to certain conditions relating to the subordinated units), you can send a special request messages using event frames.

The object of the invention is also a device designed to be part of a master unit (or for the connection with the master unit) multiplex communication network type LIN, to control the activation of the subordinate units of this network LIN and designed in such a way that, when the driver unit has detected activity in the network during the phase out:

- request specifying unit to transmit at least some of the sub-blocks (and preferably on all blocks, which can be the source of the request for activation and, consequently, the detected activity), special request messages to which they should respond with a reply message containing a status field whose value characterizes a local or nonlocal source detected activity, then

- analyze the value of the status field of each message from the reply adopted by the specifying unit, the button to determine whether at least one slave block the detected activity and in case of confirmation whether this activity relative to the corresponding values of the status field, and

- allow specifying unit to confirm the activation of the subordinate units, only if the detected activity is justified.

This device can also be designed in such a way that, when the response message contains a status field whose value characterizes a local or nonlocal source detected activity and, in the case of a local source, event type, locally called the activity detected, to determine the propriety of the detected activity, depending on the type of event, locally caused the activity.

This device can also be designed in such a way that in the absence of justification detected activity to request from the master unit to instruct subordinate blocks their return to the idle state.

The object of the invention is also driver unit designed for use in multiplex networks LIN and equipped with the above described control device.

Other distinctive features and advantages of the present invention will be more apparent from the following detailed description with reference to the accompanying drawings on which:

Figure 1 - schematic view of multiplex networks LIN, containing five subordinate units and driver unit equipped with a control device in accordance with the present invention.

Figure 2 - example of a message sequence, to achieve activation permissions.

The accompanying drawings are not only Supplement the invention, but also, if necessary, help to characterize him.

The invention aims to propose a method and a corresponding device that allows you to control the activation of the subordinate units multiplex communication network type LIN.

In the future, as a non-restrictive example, will be considered the case when the network (multiplex network connection type LIN) R installed on the vehicle, for example on the car. However, the invention is not limited to this application. Indeed, it concerns LIN networks for any application.

1 schematically shows non-restrictive example network LIN R, containing the bus, which is connected to the control unit (or node) Ω, called the master unit, and the other five functional blocks (or nodes) OEi (i = 1 to 5), called subordinate units.

It should be noted that the LIN network in accordance with the present invention is not limited to this number (5) subordinate units OEi. Indeed, it should containing the e l e C at least one slave block.

It should also be noted that the driver unit OHM and subordinate units OEi can be of any type. For example, in the case of the car we can talk about the elements, devices or units air-conditioning system, or control system move the Windows or doors are locked.

Driver unit OM may, for example, contain the master device (or machine) DP, which is designed to control various phases of the activity (phase standby PV and activate PR) subordinate units OEi its network LIN R. As shown in non-restrictive example, it is the main DP device can be an integral part specifying unit OHMS. However, in a variant it may be associated with the master unit OHMS. Therefore, the master device DP can be performed in the form of software (or information) modules, or in the form of electronic circuits, or as a combination of electronic circuits and software modules.

The invention proposes to associate with the master unit OM control device D, which is specially designed to control the activation of the subordinate units OEi. As shown in the non-restrictive example, that the control device D may be part of the DP master device (in this case, it is part of it (or part of a machine)). However, in a variant it can only be connected with this is a General device DP. In addition, in the absence of the master device DP it can be an integral part specifying unit OHM or can be connected with it. Therefore, the control device D can be performed in the form of software (or information) modules, or in the form of electronic circuits, or as a combination of electronic circuits and software modules.

The control device D is designed for implementing the method of control in accordance with the present invention each time his driver unit OHM detects activity on the bus during the standby phase PV. It should be recalled that the activity may be caused by the transmission on the bus from the slave unit OEi request message to activate the MV network or may be caused by interference. In either case, the other sub-blocks OEi (i≠i), and driver unit OHM perceive this activity as a command to activate, so these blocks are transferred in the activation phase PR. Therefore, when the driver unit OHM detects activity on the bus, he warned about the activation of the subordinate units OEi.

The control method in accordance with the present invention includes three main stages, the description of which follows the example message sequence presented in figure 2.

The first main step (i) of the method begins when the driver unit OHM detects activity on the bus In IOM is NT t1 phase standby PV. In non-restrictive example shown in figure 2, the driver unit OHM detects at t1 availability request message to activate MV, which he perceives as the activity, which should be checked.

Immediately after this detection, the control device D instructs specifies the unit of OHMS to send special messages (or frames) with the request MDi (i = 1 to N), at least some of the subordinate units OEi and preferably on all blocks that can be sources of activation request (that is, blocks that are known to define the unit of Ω as being subordinate units OEi, which can be initiated by activation request and, therefore, the detected activity) via the bus Century-the Beginning of t2 transmit special messages query MDi essentially corresponds to the beginning of the activation phase PR subordinates blocks OEi.

According to the invention, each slave unit OEi must immediately respond to a special request message MDi which it relates, using the response message of MRi, which contains the status field of the CE whose value characterizes a local or nonlocal source detected activity.

It should be noted that, when all the sub-blocks OEi, which can be the source of the activation request, consistent with the LIN Protocol version LIN 2.0 and LIN 2.1, it is possible optimization is to ensure that the management of special-request message, MDi, using event frames. This solution is applicable only for subordinate units OEi, corresponding to the LIN Protocol version LIN 2.0 and LIN 2.1, since the sub-blocks corresponding to the LIN Protocol of the previous versions (LIN 1.3 or earlier)cannot be controlled by event personnel. This option allows you to limit the number of messages is strictly necessary number, as in this case, only the slave(s) block(s)which is(iesa) source activation request, responsible, transmitting the response message.

The status field of the CE may, for example, take two binary values, one of which (for example, 0) is used to report that the event occurred in the considered subordinate unit OEi (non-local sources), did not cause any activity, and the other (for example, equal to 1) is intended for the message that the activity is caused by an event occurring in the considered subordinate unit OEi (local source).

It should be noted that more complete version the value of the status field of the CE response message MRi may also be characterized by the type of event that locally evoked activity. In this case, the value of the status field of the COE determined that at least two bits to represent at least three different ways (the first to report a non-local source, the second d is I reports a local source, corresponding to the first event type, and at least one third message for a local source corresponding to the second type of event).

In another embodiment, the event type can be associated with a bit position in the status field of the response message MRi (it should be recalled that one byte can encode up to eight different event types).

The second main step (ii) of the method consists in the analysis of the values of the status field of the CE of each of the response messages MRi (i = 1 to N), the received master unit OHMS through the bus and received from the various subordinate units OEi.

This analysis, carried out by the control device D, is designed to determine whether at least one slave unit OEi source activity, which was detected on the first main step (i), and, in case of confirmation, whether this activity detected relative to the corresponding values of the status field of CE. Really, we are talking about the definition from the application point of view, allowed or not to call this activity a subordinate unit OEi, which is the source of the detected activity. It is clear that knowledge of the type of event (or causes)that caused the activity is extremely necessary information for the control device D, as it may allow its application easier to determine, justified this activestyle not.

The third main step (iii) of the method is to allow specifying unit OHM confirm the activation of the subordinate units OEi only if activity is detected on the first main step (i) of the method was justified on the second main step (ii). It is clear that such a resolution specifying unit OHM outputs it to the control device D.

In non-restrictive example presented in figure 2, the status field of the CE response message MRi first slave unit OE was not specified, as this unit did not have time to initialize (or go in the activation phase PR) when he got designed a special request message MD1. But other sub-blocks OEi (and, in particular, the second block OE and the N-th block OEN) time to initialize itself and to answer obtained appropriate special request messages MDi. For example, the state field of the CE response message MR2 from the second slave unit OE contains the value a, which means that this block is the source of the detected activity, and the status of the CE response message MRN from the N-th slave unit OEN contains the value b, which means that he is not the source of the detected activity. It should be noted that the block which is the initiator of the activation request, is initialized by default and ready to respond CPA is for receiving the first special request messages MDi.

In this case, during the analysis of the values of the status field, all response messages MRi device control D believes that the activity of the second slave unit OE was justified. Therefore, he allows his setting unit OHM confirm the activation of the subordinate units OEi. Then, you may begin the phase of "normal" work PF subordinate units OEi at the time t3 (which also marks the end of the activation phase PR subordinate units OEi). In fact, this phase of the normal operation of the PF starts when the driver unit OM begins to transmit on the bus in the direction of subordinate units OEi functional programming chart TF, which defines the operations that they should implement.

It should be noted that, if during the analysis of the control device D determines that the activity was not justified, it queries the driver unit OHM instruct subordinate units OEi return to the idle state. In this case, the driver unit OHM classically transmits on the bus (at time t3) transfer message waiting in the direction of subordinate units OEi, so they moved to a waiting phase PV. In this case, the waiting phase PV replaces the above-mentioned phase normal operation PF.

The invention is not limited to the above-described variants of the method of control, device control and driving unit, presented and only as an example, and covers all possible versions, which can provide specialist within the following claims.

1. The method of controlling the activation of the subordinate units (OEi) multiplex communication network type LIN (R), managed master block (Ω), characterized in that it consists in the fact that, when the said driver unit (OHMS) detects activity in said network (R) during the standby phase, i) at least some of the subordinate units (OEi) send a special request message to which they must respond with a reply message containing a status field whose value characterizes a local or nonlocal source detected activity, then ii) analyze the value of the status field of each of the response messages, adopted referred to the master unit (OM), to determine whether at least one slave unit (OEi) source mentioned activity and, in case of confirmation, whether this activity relative to that of the corresponding value of the field status, and (iii) allow the activation of the aforementioned subordinate units (OEi), only if the activity is justified.

2. The method according to claim 1, characterized in that in step i) send a special request message to all subordinate units, from which may come the above-mentioned detection is fair activity.

3. The method according to claim 1, wherein each response message contains a status field whose value characterizes a local or non-local source of activity and, in the case of a local source, event type, locally causing the said activity.

4. The method according to claim 2, wherein each response message contains a status field whose value characterizes a local or non-local source of activity and, in the case of a local source, event type, locally causing the said activity.

5. The method according to one of claims 1 to 4, characterized in that in stage (iii) in the absence of justification mentioned activity mentioned driver unit (OHMS) prescribes mentioned subordinate units (OEi) to return to the idle state.

6. The method according to one of claims 1 to 4, characterized in that in step i) send a special request messages using event frames.

7. The method according to claim 5, characterized in that in step i) send a special request messages using event frames.

8. The device (D) control the activation of the subordinate units (OEi) multiplex communication network type LIN (R), managed master block (Ω), characterized in that it is designed in such a way that, when the said driver unit (OHMS) found activity in said network (R) during the standby phase, i) predpisyvaet the mentioned setting unit (OHMS) pass, at least some of the aforementioned subordinate units (OEi) special request message to which they must respond with a reply message containing a status field whose value characterizes a local or nonlocal source mentioned activity, then ii) to analyze the value of the status field of each of the response messages, adopted referred to the master unit (OM), to determine whether at least one slave unit (OEi) source mentioned activity and, in case of confirmation, whether this activity relative to that of the corresponding value of the field status, and (iii) to resolve the aforementioned setting block (Ω) to confirm the activation of the subordinate units (OEi), only if the activity is justified.

9. The device according to claim 8, characterized in that it is designed in such a way that, when the said driver unit (OHMS) found activity in said network (R) during the standby phase, to order the specifying unit (OHMS) to pass a special request message to all subordinate units, which can be a source referred to the detected activity.

10. The device according to PP and 9, characterized in that it is designed in such a way that in the presence of message response containing the status field, the value of which characterized the t local or nonlocal source detected activity and in the case of a local source, event type, locally causing the above-mentioned activity, to determine the propriety of the detected activity, depending on the type of event, locally caused the activity.

11. The device according to PP and 9, characterized in that it is designed in such a way that in the absence of justification mentioned activity to request from master block (Ω) to order the subordinate units (OEi) return to the idle state.

12. The device according to claim 10, characterized in that it is designed in such a way that in the absence of justification mentioned activity to request from master block (Ω) to order the subordinate units (OEi) return to the idle state.

13. Driver unit (OHMS) for multiplex network type LIN (R), also containing subordinate units (OEi), characterized in that it contains a control device (D) according to one of p-12.



 

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