DE102021120798A1 - Procedure for transmission of calibration data, control device and computer program product - Google Patents

Abstract

The invention relates to a method for transferring calibration data (1) to a memory (2) of a control unit (3) for controlling an electronic pump actuator (4) in a drive train (5) of a motor vehicle (6), comprising a control unit (3). a memory (2) and a processor (7), the control unit (3) having an interface (8) for the transmission of calibration data (1) into the memory (2) and/or the processor (7).

Description

The present invention relates to a method for transferring calibration data into a memory of a control unit for controlling an electronic pump actuator in a drive train of a motor vehicle, comprising a control unit with a memory and a processor, the control unit having an interface for transferring calibration data into the memory and/or or comprises the processor. The invention also relates to a control device and a computer program product.

A drive train of a hybrid vehicle includes a combination of an internal combustion engine and an electric motor, and allows - for example in urban areas - a purely electric mode of operation with simultaneous sufficient range and availability, especially when driving overland. In addition, there is the possibility, in certain operating situations, to be driven simultaneously by the internal combustion engine and the electric motor. The electric motor of hybrid vehicles usually replaces the previously used starter for the internal combustion engine and the alternator in order to reduce the increase in weight of the hybrid vehicle compared to vehicles with conventional drive trains.

How from the EP 0 773 127 A1 , DE 100 18 926 A1 and U.S. 2007/0175726 A1 is known, a first clutch arrangement can be arranged between the internal combustion engine and the electric motor in order to separate the internal combustion engine from the electric motor and the remaining drive train of the hybrid vehicle. When driving purely electrically, the first clutch arrangement is then opened and the internal combustion engine is switched off, so that the output torque of the hybrid vehicle is applied solely by the electric motor.

Hydraulic clutch actuation systems—also referred to as hydraulic release systems—are known for actuating such clutch arrangements in hybrid vehicles. Electronic pump actuators (EPA) are increasingly being used to actuate such separating clutches in hybrid drive trains, which can be used both to cool the electric motors, to lubricate bearings and/or to actuate clutches hydraulically, with the preferred for the various hydraulic circuits Gear oil is used as a hydraulic fluid for hydraulic control tasks.

It is usually necessary before delivery or commissioning of such electronic pump actuators to calibrate some systems of an electronic pump actuator, for example due to manufacturing tolerances. This can include, for example, a learning process in which the electronic pump actuator is moved by a test bench using a position specification. During the process, the position values are then recorded by an external position sensor together with the incremental values generated by the electronic pump actuator as a result of the process. Based on the determined values, a characteristic curve is then written back from the test bench to the control unit of the electronic pump actuator. Such calibration data sets are usually of great importance and sensitivity for the correct functioning of an electronic pump actuator.

It is therefore the object of the invention to provide a method for reliable transmission of calibration data to a memory of a control device for controlling an electronic pump actuator in a drive train of a motor vehicle.

1. a) Anschließen einer die zu übertragenden Kalibrierungsdaten, umfassend eine fest vorgegebene Anzahl an Kalibrierungsdatensätzen, vorhaltenden Datenquelle an die Schnittstelle des Steuergeräts, wobei wenigstens einer der zu übertragenden Kalibrierungsdatensätze, bevorzugt alle zu übertragenden Kalibrierungsdatensätze eine Prüfsumme aufweisen,
2. b) Initiieren einer Importroutine zum Einlesen der zu übertragenden Kalibrierungsdatensätze in den Prozessor und/oder Speicher des Steuergeräts,
3. c) Übermitteln einer fest vorgegebenen Anzahl an zu übertragenden Kalibrierungsdatensätzen in den Prozessor und
4. d) Vergleich der wenigstens einen Prüfsumme der zu übertragenden Kalibrierungsdatensätze mit einer erwarteten Prüfsumme und
5. e) beim Vorliegen der Bedingung, dass die die Prüfsumme der zu übertragenden Kalibrierungsdatensätze mit der erwarteten Prüfsumme übereinstimmt, die zu übertragenden Kalibrierungsdatensätze in den Speicher geschrieben werden und
6. f) das beim Vorliegen der Bedingung, dass die die Prüfsumme der zu übertragenden Kalibrierungsdatensätze mit der erwarteten Prüfsumme nicht übereinstimmt, die zu übertragenden Kalibrierungsdatensätze nicht in den Speicher geschrieben werden.

This object is achieved by a method for transferring calibration data into a memory of a control unit for controlling an electronic pump actuator in a drive train of a motor vehicle, comprising a control unit with a memory and a processor, the control unit having an interface for transferring calibration data into the memory and /or has the processor, comprising the following steps:

1. a) connecting a data source holding the calibration data to be transmitted, comprising a fixed predetermined number of calibration data sets, to the interface of the control unit, wherein at least one of the calibration data sets to be transmitted, preferably all calibration data sets to be transmitted, have a checksum,
2. b) initiating an import routine for reading the calibration data records to be transferred into the processor and/or memory of the control unit,
3. c) transmission of a fixed number of calibration data sets to be transmitted to the processor and
4. d) comparison of the at least one checksum of the calibration data sets to be transmitted with an expected checksum and
5. e) if the condition is met that the checksum of the calibration data sets to be transmitted matches the expected checksum, the calibration data sets to be transmitted are written to the memory and
6. f) if the condition exists that the checksum of the calibration data sets to be transmitted does not match the expected checksum, the calibration data sets to be transmitted are not written to the memory.

This has the advantage that the calibration data sets in the memory of the control device are not unintentionally stored or overwritten with incorrect or incomplete calibration data sets, which could possibly lead to a failure of the electronic pump actuator.

A control device, as used in the present invention, is used, in particular, for the electronic control and/or regulation of one or more technical systems of an electronic pump actuator.

A control device has, in particular, a wired or wireless signal input for receiving electrical signals, in particular, such as sensor signals. Furthermore, a control unit likewise preferably has a wired or wireless signal output for the transmission of, in particular, electrical signals, for example to electrical actuators or electrical consumers of the motor vehicle.

Control operations and/or regulation operations can be carried out within the control device. It is very particularly preferred that the control unit includes hardware that is designed to run software. The control unit preferably includes at least one electronic processor for executing program sequences defined in software.

The control unit can also have one or more electronic memories in which the data contained in the signals transmitted to the control unit can be stored and read out again. Furthermore, the control unit can have one or more electronic memories in which data can be stored in a changeable and/or unchangeable manner.

A control unit can include a plurality of control units, which are in particular arranged spatially separated from one another. Control units are also referred to as electronic control units (ECUs) or electronic control modules (ECMs) and preferably have electronic microcontrollers for carrying out arithmetic operations for processing data, particularly preferably using software. The control units can preferably be networked with one another, so that wired and/or wireless data exchange between control units is made possible. In particular, it is also possible to network the control units with one another via bus systems present in the motor vehicle, such as a CAN bus or LIN bus.

According to an advantageous embodiment of the invention, provision can be made for calibration data sets to be overwritten to be present in the memory, which are overwritten by the calibration data sets to be transmitted. The security of the control unit can be increased by preventing existing calibration data records from being overwritten by data that may contain errors. Basically, after a certain period of operation or after a repair, it may be necessary to recalibrate the control unit or the electronic pump actuator. Basically, it would not be desirable to overwrite existing data with a possibly incorrect calibration data set.

According to a further preferred development of the invention, it can also be provided that the calibration data sets to be transmitted have a checksum for all calibration data sets to be transmitted. It can hereby be achieved that not only some but all transmitted data can be checked. The checksum is particularly preferably determined when the data records are received in the processor. In addition, it is conceivable that the checksum of the transmitted calibration data records is determined before it is sent to the processor and the checksum determined in this way is added to the transmitted calibration data as a parameter.

Furthermore, according to a likewise advantageous embodiment of the invention, it can be provided that the calibration data records to be overwritten have a checksum for all calibration data records to be overwritten, this checksum being stored in the memory of the control unit. The advantageous effect of this refinement is based on the fact that an additional security query is made possible as to whether the checksum of the calibration data records to be transmitted corresponds to the checksum of the calibration data records to be overwritten.

According to a further particularly preferred embodiment of the invention, it can be provided that the checksum is calculated using a cyclic redundancy check, in particular with a CRC-16, which has proven to be particularly suitable in connection with the invention, in particular with regard to a low Processor performance and a fast executability of the algorithm. In principle, however, other checksum generation algorithms would also be possible suitable for calculating and checking a checksum.

Furthermore, the invention can also be further developed in such a way that, if the condition is met that the checksum of the calibration data sets to be transmitted does not match the expected checksum, a control signal representing the failed transmission of the calibration data sets is generated by the control unit and sent to the control signal to be transmitted Sends data source holding calibration records. The advantage of this embodiment is that a warning message can be generated for a user, which informs him that the transmission of the calibration data sets has failed.

In a likewise preferred embodiment variant of the invention, it can also be provided that the data source holding the calibration data sets to be transmitted is a test bench for calibrating an electronic pump actuator.

It can also be advantageous to further develop the invention such that the calibration data sets to be transmitted have a first data column for a parameter representing a position and a second data column for a parameter representing an electrical signal.

In particular, the first data column contains position data from an external displacement sensor. The test stand for calibrating an electronic pump actuator preferably also includes the displacement sensor. In particular, the second data column contains internal increment values of the control unit that are assigned to the position data. These data pairs can be determined, for example, by moving the pump actuator to a predefined position and then measuring the travel path of the pump actuator using the external travel sensor. At the same time, the internal incremental value of the control unit is determined. Both values are then saved and further predefined positions are approached. After a series of calibration data records has been generated in this way, they are transmitted to the control unit.

The object of the invention is also achieved by a computer program product that is stored on a machine-readable carrier, or computer data signal, embodied by an electromagnetic wave, with program code that is suitable for carrying out the method according to one of claims 1 to 8.

Finally, the object of the invention can also be achieved by a control unit for controlling an electronic pump actuator in a drive train of a motor vehicle, comprising a processor and a memory containing computer program code, the memory and computer program code being configured with the processor, the control unit for carrying out a method according to any one of claims 1 to 8.

The invention will be explained in more detail below with reference to figures without restricting the general inventive idea.

• 1 ein Steuergerät zur Steuerung eines elektronischen Pumpenaktors vor der Übertragung von Kalibrierungsdatensätzen in einer schematischen Blockschaltansicht,
• 2 ein Steuergerät zur Steuerung eines elektronischen Pumpenaktors nach der Übertragung von Kalibrierungsdatensätzen in den Prozessor in einer schematischen Blockschaltansicht,
• 3 ein Steuergerät zur Steuerung eines elektronischen Pumpenaktors nach der Übertragung von Kalibrierungsdatensätzen aus dem Prozessor in den Speicher in einer schematischen Blockschaltansicht,
• 4 Kraftfahrzeug mit einem Pumpenaktor in einer schematischen Blockschaltansicht.

It shows:

• 1 a control unit for controlling an electronic pump actuator before the transmission of calibration data sets in a schematic block diagram,
• 2 a control unit for controlling an electronic pump actuator after the transmission of calibration data sets to the processor in a schematic block diagram,
• 3 a control unit for controlling an electronic pump actuator after the transfer of calibration data sets from the processor to the memory in a schematic block diagram,
• 4 Motor vehicle with a pump actuator in a schematic block diagram.

Based on 1-3 an exemplary embodiment of a method for transmitting calibration data 1 into a memory 2 of a control unit 3 for controlling an electronic pump actuator 4 in a drive train 5 of a motor vehicle 6 is explained in more detail. An example is a corresponding motor vehicle in the 4 sketched. In the 1-3 the electronic pump actuator 4 is coupled to a bidirectional pump, which on the one hand can apply a hydraulic fluid to a clutch (not specified) and on the other hand to a cooling circuit (not specified) of an electrical machine.

A control unit 3 with a memory 2 and a processor 7 is provided for carrying out the method, the control unit 3 having an interface 8 for the transmission of calibration data 1 into the memory 2 or the processor 7 . The control unit 3 for controlling the electronic pump actuator 4 in a drive train 5 of a motor vehicle 6 thus includes the processor 7 and a memory 2 containing a computer program code. The memory 2 and the computer program code are configured with the processor 7, the controller 3 to perform a to initiate the procedure explained in more detail below.

First of all, a data source 9 holding a fixed number of calibration data sets 10 is connected to the interface 8 of the control unit 3. 1 reflects this state. All calibration data sets 1 to be transmitted have a checksum 11 .

An import routine is then initiated to start reading the calibration data sets 1 to be transmitted into the processor 7 of the control unit 3 . A fixed number of calibration data records 1 to be transmitted is then transmitted to the processor 7. This is shown in FIG 2 shown.

After the transmission, the at least one checksum 11 of the calibration data records 1 to be transmitted is compared with an expected checksum 12 . The checksums 11, 12 were calculated using the CRC-16 method. If the condition is met that the checksum 11 of the calibration data sets 1 to be transmitted matches the expected checksum 12, the calibration data sets 1 to be transmitted are written to the memory 2, which the 3 shows. From the synopsis of 2 and 3 it can also be seen that the memory 2 already contains calibration data sets 13 that are to be overwritten and are overwritten by the calibration data sets 1 that are to be transmitted. The calibration data records 13 to be overwritten have a checksum 14 for all calibration data records 13 to be overwritten, this checksum 14 also being stored in the memory 2 of the control unit 3 .

If the condition is met that the checksum 11 of the calibration data sets 1 to be transmitted does not match the expected checksum 12, the calibration data sets 1 to be transmitted are not written to the memory 2. In addition, a control signal 14 representing the failed transmission of the calibration data sets 1 is generated by the control unit 3 and is available to the calibration data sets 1 to be transmitted

In the embodiment shown 1-3 data source 9 is a stationary test bench for calibrating an electronic pump actuator 4. The necessary calibration data sets 1 can be generated by means of the test bench. These calibration data records 1 to be transmitted have a first data column 15 for a parameter 16 representing a position and a second data column 17 for a parameter 18 representing an electrical signal.

The invention is not limited to the embodiments shown in the figures. The foregoing description is therefore not to be considered as limiting but as illustrative. The following patent claims are to be understood in such a way that a mentioned feature is present in at least one embodiment of the invention. This does not exclude the presence of other features. If the patent claims and the above description define 'first' and 'second' feature, this designation serves to distinguish between two similar features without establishing a ranking.

Reference List

1

calibration data

2

Storage

3

control unit

4

pump actuator

5

powertrain

6

motor vehicle

7

processor

8th

interface

9

Data Source

10

calibration records

11

checksum

12

checksum

13

Calibration Records

14

checksum

15

data column

16

parameter

17

data column

18

parameter

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely 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

• EP 0773127 A1 [0003]
• DE 10018926 A1 [0003]
• US20070175726A1 [0003]

Claims (10)

Method for transferring calibration data (1) to a memory (2) of a control unit (3) for controlling an electronic pump actuator (4) in a drive train (5) of a motor vehicle (6), comprising a control unit (3) with a memory (2 ) and a processor (7), the control unit (3) having an interface (8) for the transmission of calibration data (1) into the memory (2) and/or the processor (7), comprising the following steps: a) Connecting a data source (9) holding the calibration data (1) to be transmitted, comprising a fixed predetermined number of calibration data sets (10), to the interface (8) of the control unit (3), wherein at least one of the calibration data sets (1) to be transmitted , preferably all calibration data records (1) to be transmitted have a checksum (11), b) initiating an import routine for reading the calibration data records (1) to be transmitted into the processor (7) and/or memory (2) of the control unit (3), c) transmission of a fixed number of calibration data records (1) to be transmitted to the processor (7) and d) comparing the at least one checksum (11) of the calibration data sets (1) to be transmitted with an expected checksum (12) and e) if the condition is met that the checksum (11) of the calibration data sets (1) to be transmitted matches the expected checksum (12), the calibration data sets (1) to be transmitted are written to the memory (2) and f) If the condition exists that the checksum (11) of the calibration data sets (1) to be transmitted does not match the expected checksum (12), the calibration data sets (1) to be transmitted are not written to the memory (2). procedure after claim 1 , characterized in that the memory (2) contains calibration data sets (13) to be overwritten, which are overwritten by the calibration data sets (1) to be transmitted. Method according to one of the preceding claims, characterized in that the calibration data sets (1) to be transmitted have a checksum (11) for all calibration data sets (1) to be transmitted. Method according to one of the preceding claims, characterized in that the calibration data sets (13) to be overwritten have a checksum (14) for all calibration data sets (13) to be overwritten, this checksum (14) being stored in the memory (2) of the control unit (3) is saved. Method according to one of the preceding claims, characterized in that the checksum (11,12,14) is calculated using a cyclic redundancy check, in particular with a CRC-16. Method according to one of the preceding claims, characterized in that if the condition is met that the checksum (11) of the calibration data sets (1) to be transmitted does not match the expected checksum (12), the failed transmission of the calibration data sets (1) representative control signal (14) is generated by the control unit (3) and sent to the data source (9) holding the calibration data sets (1) to be transmitted. Method according to one of the preceding claims, characterized in that the data source (9) holding the calibration data sets (1) to be transmitted is a test bench for calibrating an electronic pump actuator (4). Method according to one of the preceding claims, characterized in that the calibration data sets (1) to be transmitted have a first data column (15) for a parameter (16) representing a position and a second data column (17) for a parameter (18) representing an electrical signal. exhibit. Computer program product stored on a machine-readable medium, or computer data signal embodied by an electromagnetic wave, with program code suitable for carrying out the method according to one of Claims 1 until 8th . Control unit (3) for controlling an electronic pump actuator (4) in a drive train (5) of a motor vehicle (6), comprising a processor (7) and a memory (2) containing computer program code, the memory (2) and computer program code are configured with the processor (7), the control unit (3) for carrying out a method according to one of Claims 1 until 8th to cause.

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