CN100543694C - Method for associating a control device with a program for diagnosing a simulated function chain - Google Patents

Abstract

A method for associating a control device for controlling a system, in particular a motor control device, with a program for simulating a function chain diagnosis or other program for fault analysis, has the following steps: in a A working point of the system is started within the scope of the first process (100). A fault is generated and a fault is generated by means of a program for simulating the diagnosis of the function chain or other programs for fault analysis; within the scope of the second process (200), the control device is reset and all fault memory in the control device, restarts the operating point, re-enters faults in the first process, performs interventions calculated in the first process (100) by means of function chain diagnostics, and by means of the simulation The program of the above function chain diagnosis is used to calculate the second intervention; within the scope of at least one other process, the control device is reset and the fault memory in the control device is cleared, the operating point is restarted, the fault is re-entered, the execution is carried out by means of The intervention calculated in the preceding process based on the function chain diagnosis, and a further intervention is calculated by means of the function chain diagnosis.

Description

Method for associating a control device with a program for diagnosing a simulated function chain

technical field

The invention relates to a method for associating a control unit, in particular, with a program for simulating a functional chain diagnosis, ie generating diagnostic information for a system diagnosis by simulating normal behavior and fault behavior. The resulting response routines can then be stored in a control unit and used for quick troubleshooting, ie to limit the problem to a few suspect components.

Background technique

Due to the increasing use of electronic circuits, for example especially in motor vehicles, when controlling motors, the complexity of fault diagnosis is increasing. In this case, it makes sense to investigate possible faults in the system by means of a function chain diagnostics run on an external computer. In order to be able to simulate such a functional chain, it is known, for example, to execute two systems (the system to be investigated and the program for generating the functional chain) on one computer, wherein the calculation speed needs to be adapted here. This results in very high costs, since both the control device software and the model of the system have to be implemented on the computer. However, this also affects the system performance, so that information can only be transmitted to the original system to a limited extent.

In order to solve the problems that arise, it is known to reduce the speed of fast system operations when using an original control device, for example by means of the CPU clock. On the other hand it is only possible to speed up the operation of slower systems to a limited extent, for example by setting up high-performance computers. However, there is still the problem that the original performance cannot be achieved 100% and a significant matching overhead occurs.

Contents of the invention

The technical problem of the invention is to combine a control device, such as that used in a motor vehicle for operating a motor, with a program for calculating a functional chain diagnosis (hereinafter referred to as: analyzing sensors in different operating states) value and set value) are associated. The calculation speed when simulating a function chain is much slower than that of the control unit. However, since it is necessary to intervene in the control unit, for example by means of the function chain diagnosis to change an operating point as a function of the sensor value and setpoint value, the operation of the control unit and the function chain diagnosis must be synchronized.

The invention aims at using an (application) control device for the stated technical problem without changing conventional hardware and software components.

The technical problem is solved by the method.

The method has the following steps: within the scope of a first process, start an operating point of the system, generate a fault and generate a fault by means of a program for simulating the diagnosis of the function chain, in the second within the scope of the process, reset the control unit and clear the fault memory in the control unit, restart the operating point, re-enter the fault in the first process, execute the function chain diagnosis in the first process Calculated intervention, and calculate a second intervention by means of the program simulating the diagnosis of the function chain, within the scope of at least one other process, reset the control device and clear the fault memory in the control device, restart The operating point, re-entering the fault, executes the intervention calculated in the preceding process by means of the function chain diagnostics and calculates a further intervention by means of the function chain diagnostics.

The simulation carried out within the scope of the method according to the invention can be carried out in an advantageous manner using existing series of software, if the series of software is not available, it is only necessary to freely divide the intervention position of the entrance of the control device. Can. According to the invention, it is possible to effectively avoid synchronization problems that occur when stopping a software or a computer, for example. It turns out that the method according to the invention is particularly economical, since the software of the control device does not have to be transferred to an external computer.

The system performance calculated or simulated according to the invention corresponds to the original performance of the control device. A piece of hardware does not have to match the slower running of the function chain diagnostic calculations. The method according to the invention can be transferred without problems to any control variant/system.

Advantageous embodiments of the method according to the invention are the subject matter of the dependent claims.

According to the present invention, it is suitable to carry out n+1 times of function chain diagnosis for n times of interventions. In this way, a particularly economical and still sufficiently accurate simulation of the function chain can be achieved.

Description of drawings

The invention is explained in more detail below with the aid of the drawings. in the attached picture

FIG. 1 is a flow diagram illustrating a preferred embodiment of the method according to the present invention.

Detailed ways

According to a preferred embodiment of the method according to the invention shown in FIG. 1 , the method is divided into four processes 100 , 200 , 300 , 400 . It should be pointed out that any number n of processes are conceivable, with further processes succeeding the four shown processes in an analogous manner.

In a first step 101 of the first process, an operating point is initiated by a control device. This can be achieved in particular by giving a start control signal (eg throttle position, ambient temperature, motor temperature, etc.) which provides a set operating state. Such a state can be predetermined by specifying a plurality of operating parameters.

Then in step 102 a fault is added. Such a fault may be, for example, a short circuit in an electrical circuit or the presence of a faulty sensor. It is also possible that a control link is not responding correctly. Adding a fault means, in particular, that a deviation occurs relative to a model with respect to system variables or modes of operation controlled by the control device.

In step 103 , sensor values and setpoints are then recorded, and interventions in the control unit are calculated therefrom with an evaluation program of the function chain diagnosis.

However, since the simulation program of the function chain diagnosis is calculated too slowly relative to the functions of the control unit, a suitable intervention point in the control unit may be exceeded. To this end, in the subsequent step 204 (start of the second process 200 ), the control device is reset, ie the control device is reinitialized. Furthermore, the error memory of the control unit is cleared and the starting state (ie the operating point originally selected in step 101 ) is regenerated or activated (step 201 ). It should be noted that corresponding steps of each process 100-400 have the same mantissa.

In step 202 the same faults as in step 102 are entered, and in the subsequent step 205 the intervention calculated by the function chain diagnostics in step 103 is carried out. The function chain diagnosis can then calculate a second intervention in subsequent step 203 using the data thus obtained.

The illustrated method is now carried out in a third process 300 , wherein, as mentioned above, the same method steps are designated with the same end numerals. It can be seen that two steps (305a, 305b) for performing the calculated intervention are performed in the third process.

Carry out as many of these procedures as are required for the diagnosis of each functional chain. Correspondingly, it follows that n steps (indicated by 405 a - 405 n ) in the nth described procedure refer to the execution of the calculated intervention. A restart of the control device is only necessary if the function chain diagnostics intends to respond to or intervene in an event that has occurred. Since a restart of the control device can take place during the calculation of the function chain, the method described can be used in almost all fault situations without multiple time expenditures.

The described sequence of steps can consist of only a small number of control signal groups for only a small number of processes, a significantly higher number of processes can be provided, approximately in the order of ten, twenty, fifty or a hundred. In the case of high-performance computers, it is also possible to carry out a number of processes in the order of thousands or even tens of thousands. The method according to the invention differs from conventional rules in particular in that a large number of processes can be carried out in which the corresponding start state is repeated while at the same time the next intervention of the function chain diagnosis is calculated.

In other words, the following steps are carried out repeatedly with the method according to the invention: firstly a control device sends out a start control signal in order to generate a set operating state characterized by a plurality of operating parameters. Predetermined deviations are then introduced into a system or a model representing the system, and on the basis of this model an actual operating state is generated which differs from the set operating state. Corresponding control signals are then fed one after the other in the sequence produced so far in order to bring the system into successive actual operating states or to represent successive actual operating states.

During the sequence of the control signals and at the end of the sequence, the actual operating state is detected by means of the sensor setpoint signal or the output setpoint signal and, in particular, at the same time as each other The sensor signals as well as the setpoint signals are supplied to a computing unit, and in said computing unit, control signals are determined from these signals, which are added to the control signal sequence (process) at the end of the next process. The control device is always reset to the above-mentioned set operating state, so that after each process, the control device gives the start control signal again to generate the set operating state characterized by a plurality of operating parameters.

It should be noted that the control signal can be fed to a model of the system or to an actual system (eg a motor) at each instant.

Claims (2)

1. A method for associating a control device for controlling a system with a program for simulating a functional chain diagnosis, said method having the following steps: - within the scope of a first process (100), start an operating point of the system, generate a fault and calculate an intervention by means of a program for simulating the diagnosis of the functional chain, - within the scope of the second process (200), reset the control device and clear the fault memory in the control device, restart the operating point, re-enter the fault in the first process, perform an intervention calculated in a first process (100) for simulating said program for simulating said function chain diagnosis, and calculating a second intervention with said program for simulating said function chain diagnosis, In the scope of at least one other process, the control device is reset and the fault memory in the control device is cleared, the operating point is restarted, the fault is re-entered, the above-mentioned first process is carried out by means of function chain diagnosis and the intervention calculated in the second process, and a further intervention is calculated by means of the program for simulating the function chain diagnosis. 2. The method of claim 1, It is characterized in that, When simulating a function chain with n links, n+1 processes are executed.

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