DE102005063128A1 - Pressure sensor device for use in side door of passenger car, has measuring signal-processing device providing information signals, which is based on modification of detected pressure, and absolute value of pressure, respectively - Google Patents

Abstract

The device (10) has a pressure detecting device (12), which is mounted in a door of a motor vehicle and is designed to detect physical measuring variables (16) dependent on the barometric pressure and to provide a measuring signal dependent on the detected measuring variable. A measuring signal-processing device (14) is designed to process the measuring signal to provide two information signals (20, 22). One of the information signals is based on the modification of the detected pressure, and another information signal is based on the absolute value of the detected pressure. Independent claims are also included for the following: (1) a pressure sensor arrangement with multiple pressure sensor devices (2) a method for processing of physical measuring variables measured independent of the barometric pressure (3) a computer program with a program code for implementing the method for processing of physical measuring variables measured independent of the barometric pressure (4) a pressure processing system for processing measuring value for a safety system and a motor-control system of a motor vehicle.

Description

The The present invention is concerned with barometric pressure measurement in the motor vehicle and in particular with the use of pressure measuring sensors for controlling safety and engine management systems.

in the Motor vehicle is the determination of the ambient pressure or the barometric Pressure among others for the implementation of safety-relevant functions and for control of the engine required. For The engine management is the precise knowledge of the absolute (barometric) pressure required according to the prior art by separate, mounted in the engine compartment pressure sensors is determined.

To trigger airbags or other security systems, such as belt tensioners, also resort to information that generate a signal due to a change in ambient pressure. A measurement of a pressure rise or a relative change in pressure is particularly advantageous for the triggering of side airbag systems, since the crumple zone during side impact is substantially lower than in the case of a frontal collision of a passenger car. By means of a pressure sensor, an impact can be detected much more quickly than by means of an acceleration sensor, which is why, in particular for the sensors for side airbag control, pressure sensors are predominantly used. The pressure sensors thereby determine a relative change in pressure when the pressure sensors are installed in a cavity of the motor vehicle, since then a deformation of the cavity causes an increase in pressure (for example, ΔP / P ₀ , where P _{0 is} the instantaneous absolute pressure and ΔP the measured change in the pressure per Measuring interval).

Around a false trip to prevent a side airbag is the pressure increase signal provided by a sensor an appropriate review undergo what, for example, by comparing the pressure increase signal can happen with different thresholds. So describes German Patent 19619468C1 discloses a method for triggering a Retaining means for side impact protection in a vehicle in which a restraint means of a motor vehicle when a pressure increase signal received in a vehicle side member exceeds a threshold, or a calculated from the pressure rise signal by averaging mean pressure signal a second threshold and at the same time a differential pressure signal determined by the slope of the pressure increase signal exceeds a third threshold.

The German Patent 19830835C2 describes a method for this purpose to trigger a restraint, in particular for side impact protection in a vehicle, in which from a sensor device, a pressure signal is supplied from the triggering of the restraint depends and an algorithm for setting a changing one Threshold is started as soon as the pressure signal in a predetermined Way increases, and the retention means triggered becomes as soon as the pressure signal exceeds the threshold value.

One Disadvantage of the previous implementations is that for each application, which requires a pressure measurement, different sensor systems and their associated evaluation arrangements within a single Motor vehicle used, which is costly and beyond the vehicle weight increased or the low in particular in the vehicle available Room further restricts. In general, when using multiple independent systems is an increased technical Effort required.

at Engine management systems using an absolute pressure sensor, can over it In addition, a malfunction of the same are difficult to recognize because according to the state the technique no redundant information regarding the absolute pressure for disposal stands.

The The object of the present invention is a device and to create a procedure that makes it possible to be efficient Way different electronic systems of a motor vehicle with pressure dependent Supply tax information.

These The object is achieved by a device according to claim 1, a method according to claim 18 solved and solved by a printing processing system according to claim 20.

Of the The present invention is based on the finding that a pressure dependent Information signal for a safety system and an engine control system of a motor vehicle more efficient can be provided if a single pressure sensing device, which detects a barometric pressure dependent physical quantity with a measuring signal processing device combined, which processes the provided measurement signal, to provide a first and a second information signal, wherein the first information signal on a relative change based on the detected pressure and wherein the second information signal based on an absolute value of the detected barometric pressure.

In a first embodiment of the present invention, a pressure sensor comprises Device thus a pressure detection device and a measurement signal processing device. The pressure detection device supplies a pressure-dependent physical measured variable to the measurement signal processing device, which may be, for example, a capacitance or an electrical resistance. From the measurement signal provided, the measurement signal processing device derives a first information signal which describes the relative pressure change ΔP / P ₀ (P ₀ denotes the absolute pressure). At the same time, the measuring signal processing device supplies a second information signal which describes the absolute pressure P ₀ . By means of a single pressure sensor, it is thus possible to provide both an information signal capable of triggering a safety system and a second information signal which can be used for motor control.

at a complex system of different components, as it is a modern one Vehicle represents, it is a big advantage, if individual Assemblies can be saved. This is at least according to the invention for the the engine control system supplying pressure sensor the case. Thereby can On the one hand costs are reduced, but equally important is the one with it accompanying space and weight savings.

at an advantageous embodiment of the Present invention, the pressure detection device and the Measurement signal processing device together on a semiconductor chip attached, resulting in a signal paths between the individual modules saves and on the other hand the component size and the production costs reduced. Such a single-chip solution for controlling several The distribution of distributed systems in the vehicle also reduces the complexity of the overall system.

at a further embodiment According to the present invention, the pressure sensor device according to the invention is adapted, in a cavity of a vehicle, e.g. in the doors, attached to become. This has the big one Advantage that by means of a first information signal, which the pressure change describes the triggering of Security systems of the vehicle can be supported.

Such Security systems can e.g. Airbags, belt tensioner systems or systems in which in an impact, the steering column is pulled out of the passenger compartment or the sunroof of a vehicle is automatically closed. By the multiple attachment of pressure sensor devices according to the invention can a deformation of the vehicle or a cavity of different Directions are detected. The deformation can be due to impact an obstacle to the stationary vehicle or by the impact the vehicle to be caused to an obstacle, taking in each Case a trip of the security system is. Each pressure sensor device according to the invention delivers about it In addition, a second information signal, which on an absolute value based on barometric pressure and used for engine control can be.

This has the big one Advantage that the absolute pressure descriptive signals redundant which, on the one hand, increases the measuring accuracy and therefore the quality of the combustion in the engine boosts and what the other leads to that in the malfunction a sensor can automatically detect this malfunction, so that there can be no malfunction of the engine. For example at a two-door Vehicle, the pressure sensor device according to the invention in the side doors blocked, so lets identify at least one malfunction of a sensor, wherein a statement about which specific sensor is defective is already limited possible. In a four-door Vehicle in which the pressure sensor device according to the invention in every side door is installed, leaves clearly identify which sensor has a defect, so that during a workshop visit the troubleshooting time and the associated costs can be greatly reduced.

Consequently So can an increase the reliability the sensor system according to the invention be achieved by the function of the absolute pressure measurement in each pressure sensor arrangement and their evaluation, for example By means of a control unit always several sensors are compared can. So can for example, multiple impact sensors (e.g., side airbag sensors in two or more doors) or impact sensor (s) and engine management sensor (s) compared with each other.

As a cavity not only the doors come into consideration, but also any other partially closed volumes, which are limited by body components. This could be, for example, the engine compartment, which is delimited by the bonnet and side parts, or also an area in one of the wheel arches, which is separated from parts of the fender. In the case of mounting in the engine compartment, the original absolute pressure sensor of the engine management can be replaced by a sensor according to the invention, wherein the functionality is additionally extended by a possibility for detecting an impact of the vehicle or on the vehicle. The higher release speed compared to acceleration sensors can be an advantage in pedestrian protection, among other things be in order to trigger in the frontal collision of a passerby active safety measures, such as the opening of the hood, in time.

at a further embodiment In the present invention, both the first and the second information signal in common to a data output of the pressure sensor device available in digital form posed. This has the big one Advantage that the already existing bus systems or control lines, which lead to installed in the vehicle airbag trigger sensors used can be around the extra Signal to transmit. In this case, the first and the second information signal in individual Transfer packages in a row be, wherein the clock order can be varied suitably. This means that not necessarily alternately a first data packet with the first information signal to a second data packet with the must follow second information signal. The information that a Trigger can cause an airbag has higher priority than the Absolute pressure information for the engine control, so that in a further embodiment of the present invention, the first information signal several times is provided in succession before providing the second information signal for the Motor control takes place.

alternative it is also possible to send both information within a data packet.

The Information signals can thereby being coded in an advantageous manner, as is possible, for example, with a Manchester encoding.

at a further embodiment The present invention is a pressure sensor system of a A plurality of pressure sensor devices with a control device combined, the controller connected to each pressure sensor device is to from the first and the second information signals a first combination signal and a second combination signal too form. Due to the combination of signals may by the controller closed on the malfunction of a single pressure sensor device so that either the signal available at the signal processing can be ignored or an error message can be issued to replace the defective pressure sensor device to induce.

Very the concept according to the invention is advantageous as a print processing system for measured value processing for a safety system and an engine control system of a motor vehicle used. In this case, a pressure sensor device according to the invention with a safety system and an engine management system via a Data connection connected. The data of a single sensor can do so advantageously used to be both the engine control and safety-related Operate systems.

preferred embodiments The present invention will be described below with reference to FIG the enclosed drawings, closer explained. Show it:

1 a pressure sensor device according to the invention;

2 a pressure sensor device in the vehicle system;

3a . 3b Data transport facilities for information signals;

4 a pressure sensor arrangement according to the invention; and

5 an inventive print processing system;

The 1 shows a pressure sensor device according to the invention 10 , which is a pressure detection device 12 and a measurement signal processing device 14 having.

The pressure detection device 12 transmits a barometric pressure dependent physical measurand X ( 16 ) to the measuring signal processing device ( 14 ). The measuring signal processing device 14 provides a first information signal 20 which is based on a relative change in the detected pressure (ΔP / P ₀ ) and a second information signal 22 , which is based on an absolute value of the detected barometric pressure (P ₀ ). In this case, the physical measured variable can be, for example, a capacitance which changes in a pressure-dependent manner and which is determined, for example, directly or via a changing voltage which drops across the capacitance.

The first information signal 20 is suitable for indicating a deformation of the motor vehicle to a safety system, since it is sensitive to a rapid change in the air pressure, which indicates, when the pressure sensor device is installed in a cavity, deformation of the cavity and thus an accident. The second information signal 22 is adapted to provide information to a motor control system for a barometric pressure dependent engine setting.

A cavity into which the pressure detection device 12 can be installed, can thereby eg be a side door. Generally speaking, it must be such that a mechanical deformation of the cavity has an increase in pressure within the cavity result, as in a deformation of the cavity located in the cavity air mixture can not escape quickly enough from the cavity, so that it at least in the short term to a Increase in pressure comes. A suitable cavity thus has contact with the vehicle interior or the environment only via air channels of small cross-section. Occurs in the event of impact, so the deformation of the cavity, a short-term overpressure and, consequently, a large increase in the certain relative pressure ratio, an airbag or other security system can be triggered quickly enough to protect an occupant of the vehicle. The pressure change determining sensors are usually installed in the side doors of the vehicle.

2 shows a pressure detection device according to the invention 26 with a first vehicle-side information processing device 28 and a second vehicle side information processing device 30 , The pressure sensor device 26 corresponds largely to the pressure sensor device 10 It is just a data output device 32 extended, which is the first information signal 20 and the second information signal 22 receives this at a data output 34 the data output device 32 on a transmission path 36 transferred to. Functionally similar or functionally identical elements as in 1 are given the same reference numerals, and moreover, the following description of 2 also on the corresponding elements of 1 is applicable.

In this case, both the first information signal and the second information signal over the transmission path 36 to the first vehicle-side information processing device 28 transfer.

The first information signal and the second information signal can, as it is based on the 3a and 3b is illustrated, be transmitted either in individual data packets or in common data packets. 3a shows a possibility to transmit the first information signal, which describes the pressure change, in data packets which are transmitted independently of further data packets of the second information signal. 3a schematically shows two data packets 38a and 38b that transmit the first information signal, that carry information about the pressure change and a second data packet 40 , which contains the information about the barometric pressure. Im in 3a In the example shown, the data packets carrying the first information signal, that is to say suitable for triggering safety devices, are transmitted more frequently than the data packets carrying the second information signal in order to take account of the fact that the successful triggering of the safety device, in particular of an airbag , is extremely time critical.

The 3b shows an alternative transmission mode of the first and second information signals, in which the first and the second information signal in common data packets 42a and 42b greater length to be transmitted.

Regardless of the way in which the first and the second information signal over the transmission path 36 is transmitted from the first vehicle-side information processing device 28 only the first information signal 20 from the data stream, which over the transmission path 36 is transmitted, extracted. The first vehicle-side information processing device 28 For example, it may be the airbag control unit itself which evaluates the data in order to cause an airbag deployment based on the received first information signal. Another possibility is that the first vehicle-side information processing device 28 the first information signals extracted only from the data stream and then transmitted to appropriate control units.

At a data output 46 the first vehicle-side information processing device 28 is the second information signal in a suitable form on a second transmission path 48 given to the second vehicle-side information processing device 30 transmits, which may be, for example, an engine control unit. The second transmission link 48 may be, for example, an in-vehicle data bus system (for example LIN bus). The second vehicle-side information processing device 30 either itself processes the second information signal or forwards it to an engine control unit for processing.

4 shows a pressure sensor system according to the invention 100 with a plurality of pressure sensor devices according to the invention 102 - 102d that with a control device 104 are connected. The pressure sensor devices 102 - 102d can, for example, the pressure sensor device 10 or 26 as they are based on the 1 and 2 have been described. Functionally similar or functionally identical elements as in the 1 to 3 are given the same reference numerals, and moreover, the following description of 4 also on the corresponding elements of the 1 to 3 is applicable.

The control device 104 he receives the th and the second information signals of the respective pressure sensor means 102 - 102d and generates a first combination signal from the received first information signals and a second combination signal from the received second information signals.

Thereby can, for example, by temporal averaging of the individual received second information signals, the accuracy of the absolute pressure measurement be improved, so that the second combination signal thus generated a more precise one Measurement of the absolute barometric pressure allows. Alternatively or additionally by averaging individual signals or by comparing individual signals a combination signal is formed, which is a faulty Behavior of one of the pressure sensor devices indicates.

Of the Use of a pressure sensor system according to the invention in the vehicle has the big one Advantage that recognized as defective sensors or pressure sensor devices either by redundant information of the remaining operational sensors can be substituted or that, for example, a false triggering of an airbag or a other safety device can be avoided if the competent Sensor is detected in time as defective.

5 shows a pressure processing system according to the invention with a pressure sensor device 26 which interfaces with a security system 200 and with an engine management system 202 connected is. Functionally similar or functionally identical elements as in the 1 to 4 are given the same reference numerals, and moreover, the following description of 5 also on the corresponding elements of the 1 to 4 is applicable.

The pressure sensor device 26 delivers at a data output 26a the first and the second information signal, which either directly to a data input 200a of the security system 200 and to a data input 202a of the engine management system 202 be transferred or alternatively first to a control device 204 be transmitted.

For communication, the pressure sensor device 26 a data output or a data interface. Accordingly, the security system 200 and the engine management system 202 at their data inputs also data interfaces, so that an interface connection between the pressure sensor device 26 and the engine management system 202 or the security system 200 consists.

Be the signals directly to the security system 200 or to the engine management system 202 transmit, evaluates the security system 200 the first information signal indicative of a pressure change, to a deformation of the pressure sensor device 26 hindering cavity and thus to detect an impact. Accordingly evaluates the engine management system 202 the second absolute pressure indicative information signal to generate information concerning a barometric pressure dependent engine timing. This can be, for example, the required amount of fuel per combustion process.

Alternatively, the information signals can first be sent to the control device 204 which transmits the first and second information signals from the pressure sensor device 26 extracted data. The control device 204 transmitted to the security system 200 then only the relevant first information signals and the engine management system 202 only the relevant second information signals. As at the data input interface of the security system 200 and the engine management system 202 then there are no additional, non-relevant data, this has the advantage that a pressure-processing system according to the invention can be implemented, whereby existing security systems 200 and engine management systems 202 can be used.

In the following paragraphs should briefly again the problem underlying the invention as well as the invention proposed solution be summarized.

For different Tasks in automobiles are currently different pressure sensors required. According to the invention provides a sensor (pressure sensor) different pressure information (barometric Pressure and differential relative pressure). Currently is used within a single automobile for any application that has a pressure-dependent Information required as an input, a specific sensor used. Therefore, different sensors needed which all provide the substantially same information. This is costly, wasting space and causing a unnecessary Weight increase.

The The present invention describes a multiple use of a single Pressure sensor. That means a single sensor has the option offers application-specific printing information deliver. Therefore contributes the present invention to design sensors more economical and thus save costs, weight and space.

Of the The essence of the invention is to create a way, a single sensor to use within a motor vehicle, the different types of printing information with different Protocols available represents (barometric pressure for Engine control systems and differential relative pressure for side impact detection).

In one embodiment, a pressure sensing satellite sensor is used for side impact detection. Such a module is installed in the door cavity. The preferred output of such a satellite sensor is a differential relative pressure information (ΔP / P ₀ ) to make a side impact decision based on this signal. The preferred mode of transmission of this output signal is data blocks which are generated in the form of a Manchester-coded modulation, for example a current modulation.

at a further embodiment is a barometric air pressure sensor (BAP, barometric air pressure) used. This sensor is for the measurement of barometric altitude pressure used. With the help of this information can be a motor control the combustion of gasoline to the current atmospheric Adjust pressure conditions. As a result, a motor runs much trouble-free and more economical, even in big ones Heights. The novelty is that the side impact sensor is next to the side impact signal provides a barometric pressure information for BAP applications. In the context of this invention is a typical place in the vehicle, to get both different pressure information, the cavity inside the vehicle doors.

Prefers will the additional transfer of barometric pressure information by means of Manchester-coded charge modulation. It is in one embodiment the successive transmission of barometric and differential relative pressure information. The temporal Sequence or the rate at which the different pressure information is transmitted be, is not fixed. In particular, preference is given both information about an electronic control unit (ECU, electronic control unit).

In an alternative embodiment becomes a larger data frame formed in which both integrated and transmitted pressure information become. It contains each submitted Data frame both information about the barometric pressure as well as the differential relative Print. An electronic control unit (ECU) is in the Able to identify the different pressure information and to separate the respective information to the intended application transferred to.

In an alternative embodiment the pressure sensor has a second output interface. Thus has Each type of printing information has its own interface to one with electronic control unit (ECU). It can the ECU addressed by the various interfaces would be the same or it may be for Each interface uses a different ECU. For example, can for the differential relative pressure information transmission using a Manchester code and for the transmission the barometric pressure a transmission selected by means of an SPI interface become.

The Way, such as a pressure detection device within a Pressure sensor device according to the invention determines the physical quantity dependent on a barometric pressure, is for an implementation of the inventive concept irrelevant. So For example, a capacitive sensor that has a change the pressure due to a capacity change a surface of a closed volume to the environment. Likewise, sensors based on the piezoresistive effect are So a resistance change to use for pressure measurement, conceivable.

Also the way in which the information signals are formed and transmitted over a transmission link is not set. The inventive concept can therefore in any Vehicle types with a wide variety of transmission protocols or Bus systems are used.

Depending on the circumstances can the method according to the invention for measured value processing for a Safety system and an engine control system of a motor vehicle be implemented in hardware or in software. The implementation can be on a digital storage medium, especially a floppy disk or CD with electronically readable control signals, the so can interact with a programmable computer system that the inventive method for measured value processing for a safety system and an engine control system of a motor vehicle accomplished becomes. Generally, the invention thus also consists in a computer program product with a program code stored on a machine-readable carrier to carry out of the method according to the invention, if the computer program product runs on a computer or processor. In in other words Thus, the invention can be thought of as a computer program with a program code to carry out the process can be realized when the computer program is up a computer or processor runs.

10

Pressure sensor device

12

Pressure sensing device

14

Measurement signal processing device

16

physical measurand

20

first information signal

22

second information signal

26

Pressure sensor device

28

first vehicle-side information processing device

30

second vehicle-side information processing device

32

Data output means

34

data output

36

transmission path

38a, 38b

data packets

40

second data packet

42a, 42b

common data packets

46

data output

48

second transmission path

100

Pressure Sensor System

102a-102d

Pressure sensor device

104

control device

200

security system

202

Engine control system

204

control device

Claims (21)

Pressure sensor device ( 10 ; 26 ) for measured value processing for a safety system and an engine control system of a motor vehicle, comprising: a pressure detection device ( 12 ), which is mountable in a cavity of the motor vehicle and which is designed to detect a barometric pressure dependent physical quantity and to a dependent of the detected measured variable measurement signal ( 16 ) to provide; and a measurement signal processing device ( 14 ), which is designed to receive the measurement signal ( 16 ) to process a first ( 20 ) and a second one ( 22 ) Information signal, wherein the first information signal ( 20 ) on a change of the detected pressure and the second information signal ( 22 ) based on an absolute value of the detected pressure. Pressure sensor device ( 10 ; 26 ) according to claim 1, wherein the first information signal ( 20 ) is adapted to indicate a deformation of the cavity to a security system. Pressure sensor device ( 10 ; 26 ) according to claim 1 or 2, wherein the second information signal is adapted to provide information to the engine control system for a barometric pressure dependent engine setting. Pressure sensor device ( 10 ; 26 ) according to one of claims 1 to 3, in which the pressure detection device ( 12 ) is designed to detect a measured value as a capacitance value or a resistance value. Pressure sensor device ( 10 ; 26 ) according to one of the preceding claims, in which the pressure detection device ( 12 ) and the measuring signal processing device ( 14 ) are arranged together on a semiconductor chip. Pressure sensor device ( 26 ) according to one of the preceding claims, additionally comprising a data output device ( 32 ) to obtain a representation of the first information signal ( 20 ) and a representation of the second information signal ( 22 ) at a data output ( 34 ) of the pressure sensor device ( 36 ) to provide. Pressure sensor device ( 26 ) according to claim 6, wherein the data output device ( 32 ) is adapted to the representation of the first information signal ( 20 ) and the representation of the second information signal ( 22 ) in digital form. Pressure sensor device ( 10 ; 26 ) according to one of claims 6 or 7, in which the data output device ( 32 ) is adapted to the representation of the first information signal in a first data packet ( 38a . 38b ) the representation of the second information signal ( 22 ) in a second data packet ( 40 ), the first data packet ( 38a ; 38b ) and the second data packet ( 40 ) are made available at different times. Pressure sensor device ( 10 ; 26 ) according to claim 6 or 7, wherein the data output device ( 32 ) is formed to the representation of the first information signal and the representation of the second Infor mationssignals in a common data packet ( 42a . 42b ) to provide. Pressure sensor device ( 10 ; 26 ) according to one of Claims 5 to 8, in which the data output device ( 32 ) is adapted to the representation of the first ( 20 ) and the second ( 22 ) Provide information signal Manchester encoded. Pressure sensor device ( 10 ; 26 ) according to any one of the preceding claims, wherein the cavity is a body part or a door or an engine compartment of a motor vehicle. Pressure sensor device ( 10 ; 26 ) according to one of the preceding claims, in which the measuring signal processing device ( 14 ) det is to provide a first information signal capable of indicating a required activation of a safety system of the vehicle. Pressure sensor device ( 10 ; 26 ) according to claim 12, wherein the security system is an airbag system. Pressure sensor device ( 10 ; 26 ) according to claim 12, wherein the safety system is designed to trigger an opening of the hood of a motor vehicle. Pressure sensor arrangement ( 100 ) with a plurality of pressure sensor devices ( 102 - 102d ) according to claims 1 to 14, comprising a control device ( 104 ), wherein the control device ( 104 ) is configured to generate a first combination signal based on the plurality of first information signals and a second combination signal based on the plurality of second information signals, or based on a comparison of the plurality of second information signals based on an absolute value of the detected pressure; determine a malfunctioning or defective pressure sensor device from the plurality of pressure sensor devices. Pressure sensor arrangement ( 100 ) according to claim 15, in which the control device ( 104 ) is configured to generate a first combination signal and / or a second combination signal such that an evaluation of the first combination signal and / or the second combination signal is based on a malfunction of one of the pressure sensor devices ( 102 - 102d ). Pressure sensor arrangement ( 100 ) according to claim 15, in which the control device ( 104 ) is configured to generate the second combination signal such that the second combination signal has a higher accuracy than the second information signal of a single pressure sensor device. Pressure sensor arrangement ( 100 ) according to claim 15, wherein the control means is arranged to generate the first combination signal such that a reliability, with which the first combination signal can indicate a deformation of the cavity, over a reliability, with which the first information signal of a single pressure sensor device deformation of the cavity is increased. Method for processing a barometric pressure-dependent detected physical measured variable for a safety system and an engine control system of a motor vehicle, comprising the following steps: providing a measurement signal dependent on the detected measured variable ( 16 ); Delivering a first ( 20 ) Information signal based on an evaluation of the measurement signal, wherein the first information signal ( 20 ) based on a relative change in the detected pressure; and delivering a second ( 22 ) Information signal based on an evaluation of the measurement signal, wherein the second information signal ( 22 ) based on an absolute value of the detected pressure. Computer program with a program code for carrying out the The method of claim 19 when the program is on a computer or Processor expires. A pressure processing system for processing measured values for a safety system and an engine control system of a motor vehicle, comprising: a pressure sensor device ( 10 ; 26 ) for measured value processing for a safety system and an engine control system of a motor vehicle, comprising: a pressure detection device ( 12 ), which is mountable in a cavity of the motor vehicle and which is designed to detect a barometric pressure dependent physical quantity and to a dependent of the detected measured variable measurement signal ( 16 ) to provide; and a measurement signal processing device ( 14 ), which is designed to receive the measurement signal ( 16 ) to process a first ( 20 ) and a second one ( 22 ) Information signal, wherein the first information signal ( 20 ) on a change of the detected pressure and the second information signal ( 22 ) is based on an absolute value of the detected pressure; an interface with the pressure sensor device ( 10 ) associated security system ( 200 ) configured to detect a deformation of the cavity based on the first information signal; and an interface with the pressure sensing device ( 10 ) associated engine control system ( 202 ) configured to generate information for a barometric pressure-dependent engine setting based on the second information signal.