KR20140052862A - Method for detecting manipulation to an internal combustion engine - Google Patents

Abstract

The present invention relates to a method for recognizing an external manipulation to an internal combustion engine. The method includes: a measurement of the velocity (84) of fresh air flow and/or exhaust gas flow (72, 64); a comparison between the measured velocity (84) and a predetermined velocity (98); and recognition of an external manipulation when the comparison results show a deviation from a predetermined condition.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an internal combustion engine,

The present invention relates generally to a vehicle, and more particularly to a vehicle having an internal combustion engine. The present invention also relates to a method for recognizing an external operation on an internal combustion engine.

A method of operating an internal combustion engine for output increase is known. This type of external manipulation is also referred to as "tuning ". Such external manipulation can result in a very high load of the additional components of the internal combustion engine and / or the internal combustion engine, which can significantly shorten the service life.

According to the present invention there is provided a method for recognizing an external operation on an internal combustion engine according to claim 1 and an apparatus and a computer program product for executing the method according to parallel independent claims.

Preferred embodiments of the invention are set forth in the dependent claims.

According to one aspect of the present invention, a method for recognizing an external operation on an internal combustion engine

- measuring the velocity of the fresh air flow and / or the exhaust gas flow in the internal combustion engine,

- a comparison of the measured speed with the preset speed,

- Includes recognition of external operations when the results of the verification show deviations from the pre-established conditions.

In the context of the method according to the invention, contrast means a comparison through the calculation of the two velocities. In this case, the predetermined condition represents the allowed difference between the two rotational speed curves. If a difference between the two velocities is not allowed, the preset condition is zero. For comparison through computation, each desired computation scheme can be used. As such, rates can be subtracted, divided, or correlated. The velocities may first be converted to scalar variables for comparison and then compared to one another by subtraction or division. The result of the comparison through the calculation can be compared with a preset function relation, for example, and the result of the comparison through the calculation must conform to this function relation in order to satisfy the predetermined condition.

The external operation of the internal combustion engine for output increase may be canceled again in the future, so that in the case of damage occurring through external operation, it is considered difficult or impossible to find the cause of the damage provably from the executed external operation Is the basis of the method according to the invention. In contrast, the concept of the present invention recognizes external operations by observing the appropriate state variables of the internal combustion engine during vehicle operation and, if correspondingly, has such values that are too high for normal operation of the internal combustion engine, . As a state variable of this type, air flow through the internal combustion engine has proved to be the most suitable because the mechanical output produced by the internal combustion engine is directly dependent on this air flow.

In one embodiment the fresh air flow and / or the velocity of the exhaust gas flow in the internal combustion engine are continuously measured. This can be done, for example, by measuring this rate over time. In order to better distinguish sudden deviations between measured velocities and set velocities from deviations caused by external manipulations, the continuously measured velocities may be filtered, for example by means of averaging.

In a further embodiment, the internal combustion engine includes a turbocharger, and the speed is measured by the rotational speed of the turbocharger. This embodiment is based on the consideration that the output of the internal combustion engine can be increased much more by the rise of the boost pressure in recent high power engines. However, this means that the turbocharger can operate in the forbidden operating range, which may lead to increased wear on the turbocharger and thus premature failure of the turbocharger. If the action of raising the output is canceled as described above, it may not be possible to find the cause of the failure of the turbocharger from the operation in the forbidden operating range, and thus from the means for raising the output. Therefore, in this embodiment, it is proposed to monitor the operation of the turbocharger by the rotational speed.

In a further embodiment, the set speed is a maximum value of a constant type. In this way, the contrast can be performed in a simple manner through a direct comparison between the measured speed and the set speed, wherein the measured speed is checked to be slower than the set speed.

In a particular embodiment, the set speed is dependent on the ambient pressure of the internal combustion engine. This embodiment is based on the consideration that the turbocharger rotational speed is lowered when the engine torque is kept the same, especially when the ambient pressure drops when using the turbocharger. That is, in some cases, it may be inferred that a vehicle with an internal combustion engine is moved to climb a hill, while at the same time raising the output at the internal combustion engine and / or the turbocharger when the ambient pressure changes . To prevent this, it is proposed to form the set speed according to the ambient pressure. Alternatively, however, the actual speed may also be measured according to the ambient pressure. Eventually, the ambient pressure becomes one of the predetermined conditions of the control mentioned in the introduction.

In a preferred embodiment, the method according to the invention comprises the following steps:

- counting of recognized external operations,

- storing the counted external operations in memory.

Through the preferred embodiment of the method according to the invention, when damage occurs in the internal combustion engine and / or turbocharger, the recognized external operation can be read for diagnostic purposes. In order to prevent an external operation from being inadvertently inferred due to a measurement error, in a preferred embodiment, the recognized external operation is counted, and at this point it is left to the diagnosing technician himself whether to deduce from any counter height that the external operation is actually performed .

In a further embodiment, the method according to the invention comprises the following steps:

Measuring a peak value of the speed when an external operation is recognized;

And storing the peak value of the velocity in the memory.

The peak value of the speed can also help to reliably recognize the external operation when an external operation is recognized. When the peak value of the speed exceeds the set speed only slightly, this means that the external operation is more than Because it is an indication of an unexpected surplus that is not caused by.

In an alternative or additional embodiment, the method according to the invention

Measuring a duration of time during which the external operation is recognized;

Storing the measured duration in memory.

Similar to the peak value of the speed, the period during which the measured speed exceeds the set speed can also help to formulate the measurement results and, in some cases, to classify the measurement errors.

The external operation may preferably be an external operation that raises the output of the internal combustion engine.

According to another aspect of the present invention, there is provided an apparatus for recognizing an external operation in an internal combustion engine, particularly a calculation unit,

Measuring the velocity of the fresh air flow and / or the exhaust gas flow in the internal combustion engine,

- Contrast the measured speed with the set speed,

- is formed to recognize external manipulation when the result of the contrast indicates a deviation from the preset conditions.

The apparatus according to the invention is optionally expandable to perform one of the methods according to the invention according to the dependent claims.

In one embodiment of the invention, an apparatus according to the invention comprises a memory and a processor. In this case, the method according to the present invention is stored in a memory in the form of a computer program, and the processor is provided for executing the method when such a computer program is loaded from the memory to the processor.

According to another aspect of the present invention, a vehicle includes an apparatus according to the present invention.

The present invention likewise relates to a computer program having program code means for executing all steps of the method according to the invention when the computer program is run on a computer or on one of the devices according to the invention / RTI >

In connection with a computer program, external manipulation in an internal combustion engine may mean data modification or program modification of the engine control software, in particular by unauthorized persons and / or by unauthorized methods and methods.

The computer program particularly preferably should be formed separately from the computer program used for triggering the internal combustion engine and / or the turbocharger described above so that the external operation does not affect the method according to the invention and the corresponding computer program accordingly .

The present invention also relates to an electronic memory medium in which the computer program described above is stored.

The present invention also relates to an electronic control apparatus having the above-described electronic memory medium.

BRIEF DESCRIPTION OF THE DRAWINGS Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

1 schematically shows an internal combustion engine;
2 is a view schematically showing an engine control device for an internal combustion engine.

In the drawings, identical reference numerals are provided to members of the same or comparable function and are described only once.

1 shows an internal combustion engine 2 having a fresh air suction device 6 for supplying fresh air into the internal combustion engine 2. In Fig. The internal combustion engine 2 can be used, for example, for driving a vehicle which is not shown further.

The fresh air sucking device 6 includes an air inflow section 8, an air filter 10, a heat film air amount sensor 12, a branch section 14, a compressor 16, A cooler 18, a valve 20, and a branch 22. In this case the air path from the air inlet 8 to the compressor 16 represents the first section 24 where fresh air has a relatively low pressure and the air path from the compressor 16 to the internal combustion engine 2 Represents a second section 26 with fresh air having a relatively high pressure.

The exhaust gas discharge device 4 in the upper region in Fig. 1 is provided with a branch portion 28, an exhaust gas turbine 30, an oxidation catalytic converter 32, a particulate filter 34 A branched section 36, an exhaust gas flap 38, and a muffler 40. [ In this case, the air path from the internal combustion engine 2 to the exhaust gas turbine 30 represents the section 42 in which the exhaust gas has a relatively high pressure, and the air path from the exhaust gas turbine 30 to the muffler 40 Represents a section 44 in which the exhaust gas has a relatively low pressure. The pressure of the exhaust gas similarly drops stepwise along the section 44 in accordance with the flow resistance appearing in these members through the exhaust gas turbine 30, the oxidation catalytic converter 32 and the particulate filter 34 It is obvious that it can be.

In this embodiment, the exhaust gas turbine 30 is rotated through the exhaust gas discharged from the internal combustion engine 2, and thereby the compressor 16 is driven. In this way, the compressor 16 compresses the fresh air sucked through the internal combustion engine 2. This process is known to the person skilled in the art under the concept of fresh air "supercharge ", and it should be noted that there are many possible means of supercharging fresh air in this case. In Fig. 1, the exhaust gas turbine 30 and the compressor 16 are part of a turbocharger system, and such a turbocharger system may be replaced by a pressure wave supercharger.

A low-pressure exhaust gas recirculation unit 46 is disposed between the branching unit 36 of the exhaust gas discharging device 4 and the branching unit 14 of the fresh air suction device 6 in the left region of Fig. The low pressure exhaust gas recirculation portion 46 includes a unit 48 and a low pressure exhaust gas recirculation valve 50.

A high-pressure exhaust gas recirculation section 52 is located between the branching section 28 of the exhaust gas exhaust device 4 and the branch section 22 of the fresh air intake device 6 in the right region of FIG. The high-pressure exhaust gas recirculation portion 52 includes a unit 54 and a high-pressure exhaust gas recirculation valve 56. In this case, the units 48 or 52 include one exhaust gas recirculation cooler, each of which is not described in more detail with a bypass and a valve.

In operation of the internal combustion engine 2, low-pressure fresh air 58 flows through the air filter 10 and the hot-film air-quantity sensor 12, and this low-pressure fresh air flows from the branching section 14 to the low-pressure exhaust gas recirculation And is concentrated with the low-pressure exhaust gas 60 that is recirculated through the exhaust port 46. The concentrated low pressure fresh air 62 is compressed in the compressor 16. The compressed and concentrated low pressure fresh air 64 is supplied to the internal combustion engine 2 for burning the fuel as high pressure fresh air 68 in the section 22 with the recirculated high pressure exhaust gas 66 .

The internal combustion engine 2 discharges the high-pressure exhaust gas 70 as a result of combustion, and the recirculated exhaust gas 66 is obtained from the high-pressure exhaust gas in the section 28. In this case, the amount of the recirculated exhaust gas 66 is set through the high-pressure exhaust gas recirculation valve 56. The remainder 72 of the high pressure exhaust gas 70 is relaxed from the exhaust gas turbine 30 to the low pressure exhaust gas 74. The remainder 76 of the low pressure exhaust gas 74 is discharged through the outlet 78 while the recirculated low pressure exhaust gas 60 is obtained from the low pressure exhaust gas 74 in the section 36.

In this embodiment, the operation of the internal combustion engine 2 having the exhaust gas discharge device 4 and the fresh air suction device 6 is adjusted and controlled through the engine control device 80 in a manner known to those skilled in the art. For this adjustment and control, the set torque 82 to be dropped through the internal combustion engine 2 and the operating state of the above-described components are measured, and this set torque is determined, for example, It may be a predetermined driver demand torque by other technical units such as a drive dynamic controller. The operating state is measured by various measurement variables. In this embodiment, among these measurement variables, for example, the rotational speed 84 of the compressor 16 and the exhaust gas turbine 30 and the rotational speed of the internal combustion engine 2 Ambient temperature 86 appears.

The engine control device 80 controls the exhaust gas discharging device 4 and fresh air to indicate the set torque 82 by the internal combustion engine 2 based on the operating states 84 and 86 and the set torque 82. [ And generates triggering signals for control of the internal combustion engine 2 having the suction device 6. [ Of these triggering signals, only one triggering signal is shown in FIG. 1 for clarity, and reference numeral "88" is provided.

The limits of the set torque 82 are preset, and this limit is particularly dependent on the technical load carrying capacity of the internal combustion engine 2 itself and on the exhaust gas discharge device 4 and the fresh air intake device 6. [ For example, the exhaust gas turbine 30 and the compressor 16 should not be rotated at any level of speed, so that the set torque 82 through the supercharger and the possible internal combustion engine 2 is limited. The engine control device 80 is programmed to comply with the above-described predetermined limits so that the exhaust gas turbine 30 and the compressor 16 are not operated in the prohibited speed range.

However, it will be possible to reprogram the engine control unit 80 and raise the settling torque 82 that can be generated through the internal combustion engine 2 to a dangerous level so that the above-described components are technically overloaded and damaged. If the engine control device 80 is reprogrammed again to the initial functional state after the damage of such components, the manufacturer of the internal combustion engine 2 is informed that such damage is due to the operation of the internal combustion engine 2 outside the above- I can hardly prove it.

In order to prevent this, it is shown in this embodiment that the rotational speed 84 of the exhaust gas turbine 30 and the compressor 16 is recorded over time. In this way, it can be ascertained whether the corresponding turbocharger system and therefore the internal combustion engine 2 is operating in an operating range outside the predetermined limits set forth above. The rotational speed 84 may be stored, for example, in a memory in the engine control device 80, and the recorded rotational speed 84 may be read from the memory at any time, for example, and displayed on the display device 90 .

Reference is made to Fig. 2, in which an engine control device 80 for the internal combustion engine 2 is schematically illustrated.

The engine control device 80 includes a triggering unit 92 and a monitoring unit 94 in this embodiment. The triggering unit 92 is provided for generating the above-described triggering signals in a manner known to those skilled in the art, and of these triggering signals, only the triggering signal 88 is shown in FIG.

Detached from the triggering unit 92, the monitoring unit 94 is implemented in the engine control device 80. [ This separation has the advantage that an external operation that raises the output in the triggering unit 92 does not affect the monitoring unit 94.

The monitoring unit 94 includes a comparison unit 96 in which the rotation speed 84 is contrasted with the set rotation speed 98. [ The set rotational speed 98 is determined by weighting 101 the ambient temperature 86 to a constant value 102 stored in the read only memory 100 in this embodiment. In this way, it is contemplated that, during monitoring of the rotational speed 84, the boost pressure of the turbocharger system will depend on the ambient temperature 86.

For this comparison, the set rotation speed 98 of the present embodiment is compared with the rotation speed 84. [ When the rotational speed 84 exceeds the set rotational speed 98, the timer 104 for transmitting the time signal 108 to the characteristic curve recording apparatus 106 is activated. The characteristic curve recording device 106 is activated through the time signal 108 and records the rotation speed 84 in accordance with the time signal 108 in the memory 110 described above.

From this, the rotational speed 84 can eventually be read out again as described above.

Thus, in this embodiment, the rotational speed 84 is also actively controlled, for example, by an external manipulation of the triggering unit 92, which raises the output, in order not to fill the memory 110 with unimportant data that does not contain relevant information Only when recognized is recorded.

Alternatively, a counter, not shown, may be connected to the comparison unit, which increments the value stored in the memory 110 every time the set speed 98 is exceeded, and alternatively the excessively high rotational speed 84 ) ≪ / RTI >

Claims (12)

A method for recognizing an external operation on an internal combustion engine (2), the method comprising:
- the measurement of the velocity 84 of either the flow of fresh air or exhaust gas in the internal combustion engine 2 or of both flows 72 and 64,
- a comparison of the measured speed 84 with the preset speed 98,
- a method for recognizing an external operation on an internal combustion engine, including a recognition of an external operation when the verification result indicates a deviation from a predetermined condition. The method of claim 1, wherein any flow of fresh air flow and exhaust gas flow in the internal combustion engine, or velocity (84) of both flows (72, 64), is continuously measured, Way. 3. An internal combustion engine according to claim 1 or 2, characterized in that the internal combustion engine comprises a turbocharger (16, 30), the speed (84) being determined by the rotational speed of the turbocharger / RTI > 3. A method as claimed in claim 1 or 2, wherein the set speed (98) is a constant. 3. A method as claimed in claim 1 or 2, wherein the set speed (98) is dependent on the ambient pressure (86) of the internal combustion engine (2). 3. The method according to claim 1 or 2,
- counts the recognized external operations,
- storing the counted external operations in the memory (110). 3. The method according to claim 1 or 2,
- measure the peak value of the speed (84) when an external operation is recognized,
- storing the peak value of the speed in the memory (110). 3. The method according to claim 1 or 2,
- measure the duration of time during which the external operation is recognized,
- storing the measured duration in memory (110). 3. The method according to claim 1 or 2, wherein the external operation is an external operation for raising the output of the internal combustion engine. An apparatus (94) for recognizing an external operation in an internal combustion engine (2), the apparatus (94) comprising:
Measuring the velocity 84 of either the fresh air flow and the exhaust gas flow in the internal combustion engine 2 or both flows 72 and 64,
- comparing the measured velocities (72, 64) and the set velocity (98)
- means for recognizing an external operation in an internal combustion engine, the device being installed to recognize an external operation when the result of the verification shows a deviation from a predetermined condition. A computer program installed to carry out all the steps of the method according to claim 1 or 2 is stored. An electronic control device comprising an electronic memory medium according to claim 11.

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