DE102008022589B3 - Motor vehicle collision side recognizing method for controlling e.g. front-air bag, involves raising one counter, and setting another counter to output value, when collision with left side halves is concluded from comparison variables - Google Patents

Abstract

The method involves determining signal variables (ECS-L, ECS-R, SIS-L, SIS-R) related to acceleration, where the variables are delivered by impact sensors (3L, 3R) and side impact sensors (4L, 4R). A counter for a left side of a motor vehicle (1) is raised/lowered, and the counter for the right side is set to an output value, when collision with left side halves is concluded from comparison variables determined from the signal variables. The counter for the right side is raised/lowered, and the counter for the left side is set to the output value, when collision with the halves is concluded. An independent claim is also included for a control system for the passenger protection system.

Description

The The invention relates to a method for detecting a collision side in a frontal collision with partial coverage or at an angle on a motor vehicle for controlling a personal protection system and a drive system for a personal protection device in a motor vehicle.

Generic methods are, for example, in the publications DE 199 36 819 B4 . DE 198 48 997 A1 . EP 0 693 404 A2 . DE 195 37 546 A1 known.

at a frontal impact of the type described above, it may under certain circumstances be required in addition to the front airbags also side airbags (so-called sidebags) or window airbags (so-called. Windowbags) trigger. Here are only those side or window airbags triggered be, which are on the collision side of the motor vehicle. The trigger the laterally arranged personal protective equipment should take place in order to the occupants of the motor vehicle in the event of a frontal impact to protect serious injuries, which caused by the rotational movement of the vehicle and thereby potential Impact of the head of an occupant on the A-pillar of the motor vehicle caused can be.

For a reliable protective effect have to the side personal protection devices within a certain time window from the beginning of a triggering decision to be activated. In practice, this value is often on limited to a maximum of 20 milliseconds. Therefore, it is necessary that Collision side already to recognize at the beginning of the impact.

From the EP 0 693 404 A2 A method and a driving system for triggering driver and passenger airbags and side airbags is known. There, the sensor signals generated by collision sensors are fed to a central control unit and processed there. The activation of the side airbags is accomplished by the evaluation of both the collision sensor detected by a frontal and side collision located centrally in the motor vehicle and by sensor signals generated by left and right side collision detecting collision sensors, then generating a trigger signal by the control unit when the centrally located collision sensor and at least one of the two side collision sensors generate a collision signal. The collision direction results from the signal of the side collision sensor, which provides a positive signal.

Also the DE 195 37 546 A1 discloses a method and an impact detection device for triggering a restraint system in which the direction of a side impact can be deduced. As in the local 4 1, the selection of the acceleration signal A1 or A2 which is more suitable for an impact detection is carried out in that after the detection of the respective acceleration signals A1 and A2 and the formation of their absolute values | A1 | and | A2 | In step S10, first in step S11, the two acceleration signals A1 and A2 are compared with each other. If it is determined that the acceleration signal A1 from the first accelerometer is greater than the acceleration signal A2 from the second accelerometer, the amounts | A1 | and | A2 | the acceleration signals A1 and A2 compared with each other, otherwise, this comparison is performed in step S12 '. If it is determined in step S12 that | A1 | > | A2 | is, then the acceleration signal A1 is selected in step S21 and informed the evaluation that the acceleration vector A is in the first quadrant I. Otherwise, the acceleration signal A2 is selected in step S22 and the evaluation circuit is shown that the acceleration vector A is in the second quadrant II. If it is determined in step S12 'that | A1 | > | A2 | is, then the acceleration signal A1 is selected in step S23 and informed the evaluation that the acceleration vector A is in the third quadrant III. Otherwise, the acceleration signal A2 is selected in step S24 and the evaluation circuit is indicated that the acceleration vector A lies in the fourth quadrant II. The determination of the direction of impact is therefore carried out in a complicated and complicated manner.

It It is therefore an object of the present invention to specify a method with which the detection of a collision side in a frontal impact with partial coverage or an angle for controlling a personal protection system in particular certainly possible is. Furthermore, a drive system for a personal protection device be specified in a motor vehicle, which the detection of Collision side in a frontal collision with partial overlap or an angle on the motor vehicle particularly safe.

These Tasks are solved with the features of the independent claims. advantageous Embodiments emerge from the dependent claims.

In the method according to the invention, a first signal quantity corresponding to an acceleration is determined which is emitted by an acceleration sensor assigned to the left side of the motor vehicle. A second signal quantity corresponding to an acceleration is determined, which is from one of the right-hand side of the motor vehicle assigned acceleration sensor is emitted. Furthermore, a respective signal level of the first and the second signal magnitude is determined. From the first and the second signal magnitude, a comparison variable is determined, which is a measure of whether the first or the second signal magnitude is greater in magnitude than the respective other signal size. From the comparison size is closed on the collision side of the impact and a collision side associated personal protection means, in particular a side or window airbag, driven. According to the invention, a counter is provided for the left side and for the right side of the motor vehicle, wherein the counter for the left side is increased / decreased and the counter for the right side is set to an output value, if from the comparison quantity to a collision is closed with the left half of the page, and the right-side counter is increased / decreased and the left-side counter is set to an output value when a collision with the right-hand side half is made from the comparison quantity.

It is provided in an embodiment of the invention further that the counters for the left and right sides remain at the respective values, if from the comparative size neither on a collision with the right still closed with the left half of the page can be. The provision of a counting logic indicates the physical Background of a frontal impact with partial overlap or an angle in a certain direction (left or right) for one certain time. By setting the counter to an initial value can Oscillations are prevented, which occur for example in so-called. Misuse cases can, which does not trigger of a personal protection system. Under a Misuse becomes, for example, the impact of a stone or ball or starting up an object at low speeds Understood. The steps of the method according to the invention are expediently periodically at predetermined intervals, z. One millisecond, carried out, to minimize errors in determining the collision side.

According to one Another embodiment, the counters for the left side and for the right side each compared to a threshold, wherein upon reaching of the threshold corresponding to a triggering situation Value for the relevant body side is stored in a memory, which can be read by a control unit of the personal protection system is. The threshold value can be stored, for example, in an EEPROM. The provision of a threshold means that a minimum time frame for the Determination of a specific collision side is required. For example the threshold value is determined by continuous execution of the Procedure reaches every millisecond after ten milliseconds. The value stored in the memory, for example, a Boolean variable for the determined Be collision side. This variable (so-called flag) can be found in the control unit used to that of the respective collision page assigned To trigger personal protection.

In a further embodiment the determination of the comparison quantity is terminated as soon as in the memory the one trigger situation corresponding value is stored. This means after looking for a collision page a flag on z. B. "true" or "true" is set that the inventive method not done anymore and the state variable for the collision side is maintained until a reset is performed. After such a reset the procedure starts from the beginning, whereby the counters for the left and right side as part of the reset to the initial value be set.

In in the case where in a collision no body side of a Impact can be determined is in the memory for the left and the right side each corresponding to a triggering situation Value deposited. This provides a fallback solution in which in such a case where an impact is detected, However, a collision side is not determinable, the two possible Kollisionsseiten assigned personal protection means for a best Protection of the vehicle occupants are triggered.

An inventive activation system for a personal protection device in a motor vehicle comprises an evaluation unit, an acceleration sensor assigned to the left side of the body, which can deliver a first signal quantity corresponding to an acceleration signal to the evaluation unit, and an acceleration sensor assigned to the right side of the body, which transmits a second signal variable corresponding to an acceleration signal to the evaluation unit Can submit evaluation. The evaluation unit is designed to determine a respective signal level of the first and the second signal magnitude and to determine a comparison variable from the first and the second signal magnitude, which is a measure of whether the first or the second signal magnitude is greater in magnitude than the respective other signal size is. The evaluation unit is designed to close from the comparison variable on the collision side of the impact and to provide a parameter value associated with the collision side of a drive unit for the personal protection means. In the manner according to the invention, a counter is respectively provided for the left side and for the right side of the motor vehicle, wherein the counter for the left side is increased / decreased and the counter for the right side to an output value is set when a collision with the left half of the page is deduced from the comparison amount, and the right side counter is increased / decreased and the left side counter is set to an output value when the comparison amount is collision with the right one Side half is closed. The acceleration sensors associated with the left and the right side of the body correspond to one another, ie they are based on the same physical principle.

The Invention allows the determination of the collision side without over conventional personal protection systems additional To need sensors or evaluation units. Instead, you can the existing in a motor vehicle facilities that the Detection of an impact and determination of a triggering decision for personal protective equipment used, recourse become. The invention ensures that the recognition the collision side in the case of a frontal collision with partial overlap or at an angle in the shortest time Time can be done so that a timely triggering of the the collision side associated personal protection is possible.

In a further advantageous embodiment the method according to the invention the first signal size becomes one to the left lateral acceleration or one in the direction of travel acting longitudinal acceleration determined. In a further embodiment, the second signal size of a rightward lateral acceleration or one in the direction of travel acting longitudinal acceleration determined.

It is appropriate if the first and / or the second signal magnitude from a filtered acceleration signal be determined. The filtering allows peaks of the pure acceleration signal in the positive as well as the negative direction in the case of a Impact are eliminated, which leads to a falsification the by the inventive method would lead to a comparison. at the use of a pure acceleration signal could therefore in certain circumstances not clearly the collision side are determined. Furthermore, it could the circumstance occur that the triggering of a determined Kollisionsseite assigned personal protection in time he follows.

When particularly simple solution it turned out, when as a filtered acceleration signal a velocity value determined from the measured acceleration values is used. The speed is compared to an acceleration a more stable criterion and has one in the event of an impact clear polarity, d. H. a unique benchmark. In the context of the present Invention, the speed z. By summing respective acceleration values be formed.

According to one Embodiment of the drive system according to the invention the evaluation unit is formed by the drive unit.

The the left and right body side associated sensors are side impact sensors. Alternatively, those of the left and the right body side sensors associated impact sensors (so-called. Early crash sensors), which are in the front of the body are arranged.

With of the invention so that in conventional Personal protection systems used sensors and the central control unit, the so-called airbag control unit.

The Method is based either on the signals of side impact sensors for one Side or window airbag, these sensors typically detect the impact directly from the side. Alternatively, the Signals from sensors installed in the front of the motor vehicle, so-called early crash sensors, be used. This leaves the method according to the invention simple and inexpensive Realize way.

The Invention will be described below with reference to the figures. Show it:

1 a top view of a motor vehicle and the sensors installed in the motor vehicle whose signals can be used in the context of a method according to the invention,

2A the acceleration signals of a left and right crash sensor in a frontal collision with partial overlap at a speed of 64 km / h,

2 B the acceleration signals of a left and right side impact sensor in a frontal collision with partial overlap at a speed of 64 km / h,

3A from the acceleration signals of the 2A determined speed signals of the left and right impact sensors,

3B from the acceleration signals of the 2A determined speed signals of the left and right side impact sensors,

3C the depending on respective speed signals changing counter for the left and right collision side until reaching a threshold at which a personal protection means associated with the collision side is triggered, and

4 an exemplary procedure of the method according to the invention.

1 shows in plan view a motor vehicle 1 , This is provided with a plurality of personal protection means not shown in detail in the figure. Such personal protection means are z. B. a driver or passenger assigned front airbag, arranged on the driver and passenger side window airbags (window bag), which in the case of their activation between the inmates on the respective side and the A- and B- Pillar extend and optionally further side airbags, which are also provided on the driver and passenger side. Hereinafter, the driver side is referred to as the left side (collision side) of the motor vehicle and the passenger side as the right side (collision side) of the motor vehicle.

In order to activate the personal protection system or the personal protection means included in the personal protection system, is in the motor vehicle 1 a drive unit ACU is provided, which is usually attached to the vehicle tunnel. In the exemplary embodiment, the drive unit ACU comprises sensors for detecting an acceleration in the vehicle direction (x direction) as well as accelerations in the vehicle transverse direction (y direction). The accelerations detected here in the drive unit ACU are identified in the figure by ACU X and ACU Y, their sense direction being identified by the associated arrows.

Furthermore, in the area of the vehicle front, impact sensors (so-called early crash sensors) 3L and 3R which is typically in the area of a bumper 2 are arranged on the left and right sides. The impact sensors 3L . 3R serve for the earliest possible detection of a frontal impact and are designed as accelerometers in the vehicle direction.

Side impact sensors are typically used in the area of the vehicle doors or the B-pillar for detecting a side impact 4L and 4R intended. These are usually used for the earliest possible detection of a side impact and for controlling a provided on the impact side personal protection, usually the side or window airbags.

All of the sensors 3L . 3R . 4L . 4R detect an acceleration ECS-L, ECS-R, SIS-L, SIS-R in the direction of the arrow marked axis or direction and are coupled to the control unit ACU of the personal protection system, which makes the decision on the release of appropriate personal protection means and the respective Activates personal protective equipment.

The related to 1 described configuration is typical of motor vehicles, which include as passenger protection front airbags, side airbags and / or window airbags.

The determination of a collision side in the case of a front impact with partial coverage or at an angle based on the evaluation of the impact sensors 3L . 3R or side impact sensors 4L or 4R supplied acceleration signals ECS-L, ECS-R, SIS-L, SIS-R. Under the collision side is in the context of the present description, an impact of the motor vehicle 1 an obstacle on the driver's side (left collision side) or the passenger side (right collision side) understood.

In the following it is assumed that the acceleration signals ECS-L and ECS-R of the impact sensors 3L . 3R be evaluated, the process being identical under evaluation of the acceleration signals SIS-L and SIS-R of the side impact sensors 4L . 4R can be performed. The parallel evaluation of the acceleration signals of the impact sensors and the side impact sensors is not provided.

The principle underlying the method is that of the impact sensors 3L . 3R to evaluate the intensity of the delivered acceleration signals ECS-L and ECS-R. Here, a comparison of the intensity of the signals of the left impact sensor 3L and the right impact sensor 3R performed. Subtracting the signal quantities from one another results in a comparison variable, which is formed by the polarity. Based on this comparison variable can be concluded on the collision side of the impact. In this way, a personal protection means assigned to the collision side, either a side airbag or a window airbag, can be activated.

Like from the 2A and 2 B shows which respectively the sensor signals ECS-L and ECS-R of the left impact sensor ( 2A ) or the sensor signals SIS-L and SIS-R of the left side impact sensor 4L . 4R ( 2 B ) in comparison, the respective acceleration signals have strong peaks in the positive and negative directions. The measured values of the respective acceleration sensors shown over time show the acceleration signals in a frontal impact with a partial overlap (Offset Deformable Barrier, ODB) at a speed of 64 km / h. The acceleration in m / s ^{2 is} shown in each case via the y-axis. Out From this representation, it can be seen that a filtering of the measured acceleration values is expedient for an evaluation.

This is in the 3A and 3B shown, which in each case from the acceleration signals of 2A and 2 B ascertained speed signals ECS_VelL, ECS_VelR and SIS_VelL, SIS_VelR of the left and right impact sensors ( 3A ) and side impact sensor ( 3B ). From the speed signals (in m / s), which are also shown over time, it is readily apparent that either the speed signal associated with the left acceleration sensor or the right acceleration sensor has a pronounced polarity from which the collision side of the impact can be reliably deduced.

The evaluation of the velocity values of the left and right impact sensors 3L and 3R each based algorithm uses a counter for the left and the right collision side, which are increased depending on the polarity or set to an output value. For example, if the polarity of the left and right speed signals indicates that there is a collision on the right side, the counter for the right collision side is increased in the exemplary embodiment and the counter for the left collision side is reset to an output value, zero in the exemplary embodiment. Correspondingly, this applies to the opposite case. If the right and left speed values are identical, ie, the difference is zero, the counters for the left and right collision sides are neither increased nor reset. The respective meter readings are frozen instead.

The Determining the first and second speed value and the Comparison of the two values occur at regular intervals, eg. One millisecond, instead of. If one of the two counters reaches a predetermined threshold, for example, stored in a memory (eg EEPROM) can, so will a flag for the relevant collision page is set in the memory which from an evaluation unit for determining a triggering decision for the taken into account the collision side personal protection becomes. By the height the threshold, a minimum time frame can be set, within which a certain collision page is determined regularly had to become. For example, the threshold can be set to 10 (digits) be set so that with a periodic determination of the polarity every millisecond within the 10 ms z. B. 10 times the same collision side determined had to become. By resetting the other counter oscillations are excluded.

is a flag associated with a particular collision page set once, so the algorithm will not go through until a reset takes place. Only then does the algorithm start again from the beginning for the new determination of a Collision side.

In addition, can be provided that if a collision side is not detected could be the flags for both the left and the right Collision side are set, so that triggering the the passenger protection means assigned to the right and the left collision side he follows.

In 3C the course of the right and left collision side associated counter (ColSide_LCnt for the left collision side and ColSide_RCnt for the right collision side) can be seen, wherein the count of the speed values of 3A results. Out 3C It can be seen that in the present exemplary embodiment there is a collision on the right side of the motor vehicle which has reached the predetermined threshold value of 10 digits at time t = 21 ms.

In 4 the process sequence of the method according to the invention is illustrated by way of example. The method can be implemented in a function ("Function_v_CalcColSide"), wherein initially all variables are set to a start value in a known manner and the flags assigned to the memory cells are set to a value which is not triggered by the control unit of the personal protection system accessing them one of a respective collision side associated personal protection leads.

In a step S1, it is first checked whether the signals of the impact sensors are to be used for the method. If this is the case (reference symbol T), then a function (reference symbol S2) is executed which describes the difference ("sw_difference") between the filtered acceleration signals ("ECS_VelL" or "ECS_VelR") of the left and right front sensors 3L and 3R determined. If, on the other hand, the condition of step S1 is not satisfied (reference symbol F), then in a step S3 a function is carried out which determines the difference ("sw_difference") between the filtered acceleration signals ("SIS_VelL" or "SIS_VelR") of the side impact sensors 4L and 4R determined.

In a step S4, it is checked whether the difference ("sw_Difference") is greater than 0. In the case of a positive difference, the polarity is positive In this case (reference symbol T), the counter ColSide_LCnt for the left collision side is increased in step S5, while the counter ColSide_RCnt for the right collision side is reset to a starting value of 0. If the difference determined in step S4 is equal to zero On the other hand, if the detected filtered acceleration signals are not greater than zero (reference symbol F), it is checked in step S5 whether the difference is smaller than zero. If this is the case (reference symbol T), in step S6 the counter ColSide_RCnt for the right collision side is incremented and the counter ColSide_LCnt for the left collision side is reset to a start value zero. If it is determined in step S5 that the difference is also not less than zero, the counters ColSide_LCnt and ColSide_RCnt for the left and right collision side are left at their respective values and not changed.

In Step S7 is checked if the Counter ColSide_LCnt for the left collision page a predetermined threshold Par.WndBag_CntThr has reached. If this is true (reference T), then in step S8 set a variable Flag_WndBag_ColL to the value TRUE. in the In another case (reference F), it is checked in step S9 whether the Counter ColSide_RCnt for the Right collision page reaches the threshold Par.WndBag_CntThr Has. If this is the case (reference symbol T), in step S10 a Variable Flag_WndBag_ColR = TRUE set. If this is not true (reference numeral F), it is checked in step S11 whether a Variable Par.Flag_ForceBothColisionSide equals TRUE. If this is the case (reference symbol T), in step S12 the Variables Flag_WndBag_ColL and Flag_WndBag_ColR each to TRUE set. At this point the algorithm ends or starts from front. For example, the variables Flag_WndBag_ColL and Flag_WndBagColR are then set to TRUE if a collision page is not within a given time frame, z. B. 20 ms from the start of the algorithm detected could be. Alternatively, a value (eg, a Flag), which causes the two variables Flag_WndBag_ColL and Flag_WndBag_ColR are set to TRUE. Such a flag could be, for example for certain Types of collisions may be deposited, due to a For safety's sake, the personal protective equipment of both sides of the motor vehicle to be controlled. The required for this Flag in the memory can be manually filed and on the evaluation based on different crash situations. Meets the step S11 query condition not to (reference F), so ends the Algorithm also or starts from scratch.

The in conjunction with 4 described algorithm is performed periodically. As a result, upon detection of a frontal collision with partial overlap or at an angle, the determination of the collision side is possible, so that corresponding personal protection means associated with the collision side can be activated. For this purpose, the variables Flag_WndBag_ColL and Flag_WndBag_ColR are in particular queried by a corresponding control unit of the personal protection means.

The Control unit for the personal protective equipment and the unit for the implementation of the described algorithm can be identical. So they need across from the known drive systems no further hardware components be provided.

Claims (14)

Method for detecting a collision side under a frontal impact with partial overlap or an angle on a motor vehicle ( 1 ) for controlling a personal protection system, in which - a first signal quantity (ECS_L; SIS_L) corresponding to an acceleration is determined which is from one of the left side of the motor vehicle ( 1 ) associated acceleration sensor ( 3L ; 4L ), - a second signal quantity (ECS_R; SIS_R) corresponding to an acceleration is detected, which is emitted from one of the right-hand side of the motor vehicle ( 1 ) associated acceleration sensor ( 3R ; 4R ), - a respective signal level of the first and the second signal magnitude is determined, - a comparison variable (sw_Difference) is determined from the first and the second signal size, which is a measure of whether the first or the second signal magnitude is greater in magnitude than the is different signal size, and - is closed from the comparison variable (sw_Difference) on the collision side of the collision and the collision side associated personal protection means, in particular a side or window airbag, driven, characterized in that - for the left side and for the right side of the motor vehicle is provided in each case with a counter (ColSide_LCnt; ColSide_RCnt), wherein - the counter (ColSide_LCnt) for the left side is increased / decreased and the counter (ColSide_RCnt) for the right side is set to an output value, if from the comparison variable closed on a collision with the left half of the page and the counter (ColSide_RCnt) for the right-hand side is increased / decreased and the counter (ColSide_LCnt) for the left-hand side is set to an initial value if a collision with the right-hand half of the page is deduced from the comparison variable. Method according to Claim 1, in which the counters (ColSide_LCnt, ColSide_RCnt) for the left and the right-hand side remain at the respective values, if from the comparison quantity neither to one Collision with the right can still be concluded with the left half of the page. Method according to one of claims 1 or 2, in which the counters (ColSide_LCnt, ColSide_RCnt) for the left side and for the right side each compared with a threshold (Thr) when reaching the threshold (Thr) one of a trigger situation corresponding value for the relevant body side is stored in a memory, which can be read by a control unit of the personal protection system is. Method according to claim 3, wherein the determination the comparison variable (sw_Difference) is stopped as soon as in the memory of a trigger situation corresponding value is stored. Method according to one of claims 3 or 4, wherein in the Case where in a collision no body side of an impact can be determined in the memory for the left and the right side each one of a trigger situation corresponding value is stored. Method according to one of claims 1 to 5, wherein the first Signal size (ECS_L; SIS_L) from a leftward lateral acceleration or a longitudinal acceleration acting in the direction of travel determined becomes. Method according to one of claims 1 to 5, wherein the second Signal size (ECS_R; SIS_R) from a rightward lateral acceleration or a longitudinal acceleration acting in the direction of travel determined becomes. Method according to one of the preceding claims, at the first and / or the second signal size (ECS_L, SIS_L, ECS_R, SIS_R) be determined from a filtered acceleration signal. The method of claim 8, wherein as filtered Acceleration signal on from the measured acceleration values determined speed value (ECS_VelL, SIS_VelL, ECS_VelR, SIS_VelR) is used. Control system for a personal protection device in a motor vehicle ( 1 ), with - an evaluation unit, - an acceleration sensor assigned to the left-hand side of the body ( 3L ; 4L ), which can deliver a first signal quantity (ECS_L, SIS_L) corresponding to an acceleration signal to the evaluation unit, - an acceleration sensor assigned to the right-hand side of the body ( 3R ; 4R ), which can deliver a second signal quantity (ECS_R; SIS_R) corresponding to an acceleration signal to the evaluation unit, wherein the evaluation unit is designed to determine a respective signal level of the first and the second signal magnitude, from the first and the second signal magnitude one Determine comparison variable (sw_Difference), which is a measure of whether the first or the second signal magnitude is greater in magnitude than the other signal size, - to close from the comparison variable (sw_Difference) on the collision side of the impact, and - one associated with the collision side Provide parameter value of a drive unit for the personal protection means, characterized in that - for the left side and for the right side of the motor vehicle in each case a counter (ColSide_LCnt; ColSide_RCnt) is provided, - increases the counter (ColSide_LCnt) for the left side / humiliated and the counter (ColSide_RCnt) for the right-hand side is set to an initial value when a collision with the left-hand side half is deduced from the comparison variable, and - the counter (ColSide_RCnt) for the right-hand side is increased / decreased and the counter (ColSide_LCnt) for the left-hand side Page is set to an initial value when the comparison size is closed to a collision with the right half of the page. Drive system according to claim 10, wherein the evaluation unit is formed by the drive unit. Drive system according to one of claims 10 or 11, in which the sensors associated with the left and the right side of the body ( 4L . 4R ) Are side impact sensors. Drive system according to one of claims 10 or 11, in which the sensors associated with the left and the right side of the body ( 3L . 3R ) Are impact sensors, which are arranged in the front of the body. Drive system according to one of claims 10 to 13, in which this further means for carrying out the method according to a the claims 2 to 9.