DE102018219639A1 - Sequential transmission of information from parallel channels - Google Patents

Abstract

A method (200) for transmitting information (150) of a predetermined number of parallel channels (K) comprises steps of scanning (205) information (150) of all channels (K); selecting (225, 235) one of the channels (K); and transmitting (230) sampled information (150) associated with the channel (K). The channels (K) are selected after a predetermined cycle (135) and the information (150) includes a binary error state (160). A channel (K), whose error state (160) is active, is inserted into the cycle (135) at the current point and is removed from the cycle (135) after the information (150) assigned to it has been transmitted.

Description

The present invention relates to the transmission of information from several parallel channels via a common interface. In particular, the invention relates to the determination of a sequence of information to be transmitted.

A transmission oil pump is mounted on board a motor vehicle and is controlled by means of a control unit. The function and an operating state of the transmission oil pump can influence the functionality of the motor vehicle, in particular if it is driven by an internal combustion engine, so that a status of the transmission oil pump is to be monitored. If an error occurs, the severity of the error can be determined and a measure can then be taken, for example limiting the maximum speed of the motor vehicle.

To monitor the transmission oil pump, the control unit can periodically record and evaluate measured values of predetermined sizes from the channels assigned to the sizes. The recorded measured values can be transmitted to the outside as status information for diagnostic purposes. In addition, an error state can be determined for each channel if the assigned measured value lies outside a predetermined range. Information that is assigned to an error state should preferably be transmitted before status information. However, it should be avoided that frequently occurring error states of one or more channels block the transmission of measured values from other channels.

US 2016 0 231 141 A1 suggests prioritizing error information in order to transmit it in preference to status information. If an error occurs, the error information should be transmitted, followed by the corresponding status information.

US 2015 0 269 793 A1 relates to a hierarchical organization of fault conditions on board a vehicle.

An object of the invention is to provide an improved technique for providing status and error information from multiple channels on a common interface. The invention solves this problem by means of the subject matter of the independent claims. Sub-claims reflect preferred embodiments.

A method for transmitting information of a predetermined number of parallel channels comprises steps of scanning information of all channels; selecting one of the channels; and transmitting sampled information associated with the channel. The channels are selected after a predetermined cycle and the information includes a binary error state. A channel whose error status is active is inserted into the cycle at the current point and removed from the cycle after the information assigned to it has been transmitted. This expression is equivalent to selecting the faulty channel and not advancing the cycle.

A channel can correspond to a particular physical quantity that can be scanned by a predetermined device such as a motor, a pump or a bearing. A measured value preferably relates to a value of the size related to a predetermined point in time. The device can in particular be mounted on board a motor vehicle. Information can be transmitted to another control device, for example, via an interface, in particular via a data bus. The measured value can relate, for example, to a speed, a temperature or a pressure. If an abnormality of one or more measured values of one of the channels is determined, for example because the measured values deviate from a threshold value by more than a predetermined amount, an active error state can be determined for the corresponding channel.

The information can be selected or determined depending on the fault condition. If there is no error state, status information can be determined which relates, for example, to a measured value assigned to the channel; otherwise, error information can be determined, which can relate in particular to a deviation of the measured value from a predetermined threshold value. A sequence of the channels in the cycle can be predeterminable, optionally also during the running time of the method.

According to the invention, error information can be transmitted quickly after an error condition has occurred. The evaluation of an operating or fault status of the device on which the information gathered is based can thus be improved. In particular, an error state can be analyzed quickly and improved. The operation of the device can be better controlled as a function of an analysis result.

If several error states are active at the same time, the channels assigned to the active error states can be inserted one after the other into the cycle, one channel of the predetermined cycle lying between two inserted channels.

In this way it can be avoided that the transmission of status information of a channel that is not affected by an error state is delayed as long as desired. If, for example, N channels are provided, information about all channels can be provided after 2N transmissions at the latest.

A fault class can be assigned to each fault state, and the channels assigned to the active fault states can be inserted into the cycle in a sequence of fault classes assigned to them. Information of a high error class can thus be transmitted before information of a low error class. The error class can, for example, express the extent of the deviation of a measured value from a threshold value, wherein a large deviation can correspond to a high error class and a small deviation to a low error class. Other exemplary error classes include rapid, strong, and / or frequent changes in a measurement.

A priority can be assigned to each fault state, fault states of the same fault class being inserted into the cycle in the order of their priorities. The priority can be set when determining the fault condition. Alternatively, a channel can be assigned a priority.

A channel whose assigned error status is determined to be inactive after it has previously been determined to be active can be inserted into the cycle and removed after the information assigned to it has been transmitted. The end of the presence of an error state can thus also preferably be treated before status information.

It is further preferred that a channel is inserted due to an assigned active error state in the cycle before the same channel due to an inactive error state. In other words, the occurrence of an error condition can be transmitted faster than the end of the error condition. If the error state occurs in rapid succession and is deleted ("healed"), messages about the end of the error state can theoretically be completely suppressed from messages about the occurrence of the error state. However, it may still be possible to handle the fault condition.

Channels to be inserted in the cycle can be noted in a memory. If a channel is to be inserted into the cycle at a current position, the channel to be inserted can be determined on the basis of stored channels, inserted into the cycle and deleted from the memory. The channels can be stored in the memory together with corresponding status and / or error information. The channels can be sorted in or after the note, so that a subsequent read access can be accelerated. Alternatively, the next channel to be transmitted can be determined when reading from the memory.

A control device comprises an interface for transmitting information of a predetermined number of channels, the control device comprising a processing device which is set up to carry out a method according to one of the preceding claims.

The processing device can be set up to carry out a method described here in whole or in part. For this purpose, the processing device can comprise a programmable microcomputer or microcontroller and the method can be in the form of a computer program product with program code means. The computer program product can also be stored on a computer-readable data carrier. Features or advantages of the method can be transferred to the device or vice versa.

The control device can in particular be provided for controlling a device which is further preferably set up for mounting on board a motor vehicle. The device can comprise, for example, a motor or a pump, preferably an oil pump, in particular a transmission oil pump. A size can be assigned to each channel which relates to the device, its state or its operation, for example a voltage or a current. The processing device can be set up to monitor or analyze one or more measured values of one or more variables or channels and, in the case of a certain abnormal behavior, to determine an error state of a channel which is assigned to one of the measured values under consideration.

• 1 ein System;
• 2 ein Ablaufdiagramm eines Verfahrens; und
• 3 einen beispielhaften zeitlichen Ablauf von Übermittlungen von Informationen mehrerer Kanäle

darstellt.The invention will now be described in more detail with reference to the accompanying figures, in which:

• 1 a system;
• 2nd a flowchart of a method; and
• 3rd an exemplary timing of transfers of information from multiple channels

represents.

1 shows a system 100 , which can be attached in particular on board a motor vehicle. The system 100 includes a facility 105 by means of a control device 110 can be controlled or monitored. The control device 110 is set up to receive information from a predetermined number of channels K to process. There are eight channels K1 - K8 provided, each from a sensor 115 at the facility 105 or can be fed from another source. For example, processing results, preferably based on control and / or measured values of the device 105 can be determined a channel K form.

A processing facility 120 is set up to get information from the channels K to sample and further process. In particular, for each channel K an error condition can be determined. In addition, the information of the channels K one after the other via an interface 125 transmitted or made available to the outside world. You can do this using an assignment table 130 to start a cycle 135 and / or a memory 140 be provided.

The processing facility 120 can all channels K scan and determine an error state with respect to the information collected. A channel K whose error status is active, ie whose error has identified an error, can be stored in the memory 140 be noted. The specific, the channel K associated information can also be in memory 140 be filed. No more information can be stored in memory 140 older ones can be deleted. As long as in memory 140 no channel K with active error status is noted, information of the channels K one after the other over the interface 125 be transmitted. The order of transmission is through the cycle 135 predetermined. The contents of the mapping table 130 are preferably read out cyclically in order to determine which channel K to be transmitted at a given time.

Is in memory 140 a channel K noted with an active error status, so information of this channel K be transmitted without being through the cycle 135 to follow the given order. Information about the faulty channel K are preferred rather than one by one cycle information 135 given channel K transmitted, rather the cycle 135 temporarily stopped and information of the malfunctioning channel K are inserted once in the predetermined order.

Preferably, information is transmitted from a faulty channel K always a predetermined number of transmissions of information of a non-faulty channel, which through the cycle 135 is specified. In a preferred embodiment, this number is 1 , so that between two pieces of information malfunctioning channels K Always at least one piece of information from a channel that is not faulty K is transmitted. This behavior can be deviated if there are more channels K are faulty than not faulty.

In the lower part of 1 is exemplary information 155 shown as for one of the channels K can be determined. The components of the information shown 150 are not mandatory and their order is not binding. The information shown 150 includes an example channel identification 155 who have a channel K identified who the information 150 assigned; an error condition 160 that identifies an error that has occurred; an error code 165 associated with an error that has occurred; an error class 170 , which indicates the type of error that has occurred; a priority 175 , which indicates the urgency of an error that has occurred; a status 180 which is a state of the channel K associated component of the facility 105 can map; and a value 185 , which can correspond to a measured value, on the basis of which the error state 160 can be determined.

2nd shows a flow diagram of an exemplary method 200 which is particularly in connection with a system 100 can be executed.

In one step 205 become the channels K sampled to provide a measurement or processing value for each of the channels K to determine. The sampled values are preferably processed further, in particular for an error state 160 for each of the channels K to determine. Thereby further information can be determined and the information 150 assigned, as described in more detail above.

In one step 210 can channels K whose fault condition 160 is active in the memory 140 be entered. Preference is given to the faulty channel K assigned, specific information 150 along with a reference to the channel K in the store 140 registered.

In one step 215 can be determined whether it is in memory 140 at least one indication of a faulty channel K located. If this is the case, then in one step 220 determine whether information that was previously transmitted is an error-free or an error-free channel K concerned. Was last information of an error-free channel K transfer, so in one step 225 an entry from memory 140 can be selected and the entry can be saved from memory 140 to be deleted. The most urgent entry is preferably selected, with the urgency regarding the error class 170 , the priority 175 and possibly further attributes of the information 150 can be determined. In a further embodiment, it can also be taken into account whether it is a set error state in each case 160 (if the fault condition 160 was previously inactive) or a deleted error state 160 (if the fault condition 160 was previously active).

In one step 230 can information 150 the selected channel K are assigned via the interface 125 be transmitted. This can be done using the information 150 be prepared appropriately, for example, for an error-free channel K other information than for a faulty channel K be selected for transmission.

Will in step 220 determines that the past transmission is a malfunctioning channel K concerned that not after the cycle 135 was selected, it can be done in one step 235 the next channel K from the cycle 135 be chosen and the cycle 135 can be advanced by one. The step 235 can also be executed when in step 215 it was determined that in memory 140 no indication of a faulty channel K is present. Then the step 230 in which information of the selected channel K can be transmitted.

Following the step 230 can the procedure 200 to step 205 return and iterate over to another channel K select and submit. In a variant, the method 200 also to step first 215 return and take the steps 215-230 can, for example, be run through until all channels K of the cycle 135 have been transmitted once. This is usually the case even with a high number of errors after a maximum of 2N passes. Only then can you jump back to the step 205 done to the channels K to scan again.

3rd shows an exemplary timing of transmissions of information from multiple channels K on an exemplary system 100 . This is made up of ten channels K1-K10 went out. The order of the channels K in the cycle 135 corresponds to that of natural numbers. Horizontal lines each represent an error condition 160 of the channels K1-K10 . A low level of a line corresponds to an inactive fault condition 160 , a high level an active fault condition 160 . In the bottom line is a sequence of transmitted channels K specified, with faulty channels K are shown with larger digits than error-free. A time is plotted from left to right. The transmission of information from all channels K1-K10 takes essentially the same length here.

At a time T0 begins the transmission of information from the channels K1-K10 . At the start of the submissions, it can be difficult to get an error condition 160 to be determined with certainty, for example because of information 150 several determinations are required or a variable to be scanned must first settle. Within a predetermined time range 305 after the beginning of the presented technique, the determination of an active error code can therefore 160 be exposed. The area 305 can for any channel K1-K10 be individually determined.

From the time T0 become information 150 of the channels K1-K10 in the specified order of the cycle 135 transmitted. At a time T1 is the cycle 135 go through once. At a time T2 after the channel K2 was transmitted again, an active error state 160 for the channel K7 determined and information 150 from K7 will be transmitted immediately. After that the cycle 135 continued and information 150 from channel K3 are transmitted. Then there are no faulty channels that have not yet been transmitted K before, so the cycle 135 with channel K4 is continued.

At a time T3 becomes the fault condition 160 from K7 set to inactive, which is also primarily before the cycle 135 is transmitted. At a time T4 become error states at the same time 160 for the channels 4th , 6 and 10th certainly. By way of example only, it is assumed that there are no other priority information, so that the faulty channels 4th , 6 , 10th in their numerical order, alternating with a channel K of the cycle 135 be transmitted. At a time T5 become the error conditions 160 of the channels K6 and K10 determined as inactive, whereupon information 150 through these channels K6 and K10 with the cycle 135 be transmitted in an interlaced manner. At a time T6 become error states 160 of the channels K1 , K4 , K6 , K7 , K8 and K10 determines and information of specific channels K1 , K4 , K6 , K7 , K8 , K10 are alternated with channels as described K of the cycle 135 transmitted in succession. It is preferred that a channel K who after the cycle 135 was selected and the channel K that was last transmitted is not retransmitted. The next channel can instead K of the cycle 135 to be chosen.

Reference symbol list

100

system

105

Facility

110

Control device

115

sensor

120

Processing device

125

interface

130

Mapping table

135

Cycle (cycle, sequence)

140

Storage

150

information

155

Channel labeling

160

Fault condition

165

Error code

170

Error class

175

priority

180

status

185

value

200

method

205

Scanning channels

210

Sort channels with active error status into memory

215

at least one channel in memory?

220

Channel selected from cycle on last run?

225

Select channel from cycle; Continue cycle

230

Send information of the selected channel

235

Select channel from memory and delete there

305

Area

T0-T6

Times

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• US 20160231141 A1 [0004]
• US 20150269793 A1 [0005]

Claims (8)

Method (200) for transmitting information (150) of a predetermined number of parallel channels (K), the method (200) comprising the following steps: - Sampling (205) information (150) from all channels (K); - selecting (225, 235) one of the channels (K); and - transmitting (230) sampled information (150) associated with the channel (K); - wherein the channels (K) are selected after a predetermined cycle (135); - The information (150) comprises a binary error state (160) and a channel (K), whose error state (160) is active, inserted at the current point in the cycle (135) and after the transmission of the information assigned to it (150 ) is removed again. Method (200) according to Claim 1 , wherein several error states (160) are active at the same time and the channels (K) assigned to the active error states (160) are inserted one after the other into the cycle (135), with one channel (K) of each inserted between two inserted channels (K) predetermined cycle (135). Method (200) according to Claim 2 , wherein each error state (160) is assigned an error class (170), and the channels (K) assigned to the active error states (160) are inserted into the cycle (135) in an order of error classes (170) assigned to them. Method (200) according to Claim 3 , wherein each error state (160) is assigned a priority (175) and error states (160) of the same error class (170) are inserted into the cycle (135) in the order of their priorities (175). Method (200) according to one of the preceding claims, wherein a channel (K), the associated error state (160) of which is determined to be inactive, after having previously been determined to be active, is inserted in the cycle (135) and after the transmission of the assigned one Information (150) is removed again. Method (200) according to Claim 5 , wherein a channel (K) is inserted due to an assigned active error state (160) in the cycle (135) before the same channel (K) due to an inactive error state (160). Method (200) according to one of the preceding claims, wherein channels (K) to be inserted in the cycle (135) are noted in a memory (140); and if a channel (K) is to be inserted at a current point in the cycle (135), the channel (K) to be inserted is determined on the basis of stored channels (K), inserted in the cycle (135) and removed from the memory (140 ) is deleted. Control device comprising an interface for the transmission of information (150) of a predetermined number of channels (K), the control device comprising a processing device which is set up to carry out a method (200) according to one of the preceding claims.

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