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    • 专利摘要:
    l2 Abstract A method in a steering fault detection system for detection of a steering fault of a vehicle,the vehicle comprises a active driver steering support (ADSS) system adapted to assiststeering the vehicle at least in dependence of one environmental signal, e. g. a camerasignal, and to generate a steering assist control signal to a steering servo system of thevehicle (step A), Wherein said steering assist control signal includes one or many steeringassist control values. The method comprises: B - applying said steering assist control signal to said steering fault detection system; C - analysing said steering assist control values in relation to predetermined ideal steeringassist control values, and D - generating an indication signal in dependence of said analysis, Wherein said indication signal includes steering fault information. (Figure l)
    公开号:SE1250978A1
    申请号:SE1250978
    申请日:2012-09-03
    公开日:2014-03-04
    发明作者:Henrik Pettersson；Per Sahlholm；Tony Sandberg；Anders Johansson
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    TitleMethod of detecting a steering fault, and a steering fault detection system of a vehicle”s steering system Field of the inventionThe present invention relates to a method of detecting a steering fault and a steering faultdetection system of a vehicle”s steering system according to the preambles of the independent claims.
    Background to the invention Steering a vehicle usually involves the driver turning the steering wheel by applying aforce to turn the steering wheel to a desired angle corresponding to the direction in whichthe driver wishes the vehicle to travel. In a vehicle with a system with a direct connectionbetween steering wheel and road wheels or with a system in which the steering is effectedvia a power servo, the force required to turn the steering wheel is a function of a givenangular friction in the steering, a given setting of wheel angles and the friction andcondition of the road. Similarly, unevenness of the carriageway and faults in the steering,e. g. plays, will also cause variation in the amount of force which needs to be applied to the steering wheel.
    There are also currently systems to help the driver steer the vehicle, e. g. so-called “lanekeep assist (LKA) systems” or “lane departure warning systems”, which is generallydenoted as an active driver steering support systems (ADSS-system). Such a system usesvarious types of sensors or detection systems (e. g. video Cameras, lasers or infraredsensors) to ensure that the driver does not stray from the respective traffic lane. He/she iswarned accordingly if the vehicle is about to leave its lane. The steering system may alsoactively steer the vehicle by controlling the steering wheel angle. As this type of systemactively regulates the vehicle, it will help the driver to compensate for further adversefactors such as caniageway unevenness, strong side wind, etc. But the system will alsocompensate for faults in the steering system, e. g. incorrect wheel settings. This activesteering by means of the steering system may cause the consequences of incorrect setting of road wheels, e. g. a tendency for the vehicle to move obliquely, to be concealed by the compensation effected by the active steering system. The inventors” of the presentapplication have concluded that these systems thus make it more difficult to diagnose and detect faults.
    More specifically, a lane keeping assist system detects lane markers on the road, andassists the driver”s steering to help keep the vehicle between lane markers. When thesystem detects the vehicle straying from its lane, it alerts the driver visually as well as witha buzzer, while applying a slight counter-steering torque, trying to prevent the vehiclefrom moving out of its lane. The LKA-system often includes a vision sensor, whichdetects shapes and positions of lane markers and a so-called steering assist electroniccontrol unit (ECU), which calculates a target steering torque based on the data from thevision sensor, and then sends a steering control signal to an electric power steering (EPS)unit, i.e. a steering servo unit of the vehicle, to control an EPS motor. The steering assistECU further determines if it is necessary to alert the driver of the vehicle”s deviation from the lane with a buzzer and a display.
    In vehicles, incorrectly set wheel geometries and plays in steered axles or wheelsuspensions lead to increased wear, particularly on tyres and bushings. When wear due toplays or incorrect settings has continued long enough, it is easy for the driver to detect, butcases of only slight wear may be difficult to detect, particularly if he/she drives the vehicledaily. Incorrectly set wheel geometries and/or plays are characterised by the steeringtorque varying so that there are for example differences in inertia when turning in differentdirections. Another problem may be that the steering torque does not follow the linearprocess intended by the steering system. For example, the steering may feel lighter at the beginning or end of the process.
    Wear at an early stage may also be difficult to detect for staff that drive the vehicle on asingle occasion (eg. when the vehicle is test-run at a workshop). For staff to be able todetect plays or incorrect settings at an early stage, the vehicle may need to be run in various different driving situations.
    Different methods and systems for detecting and indicating steering misalignment exist.These systems are often based upon detection of e. g. the steering angle and the steering Wheel torque; see for example the following patent documents.
    In GB-2,370,260 a steering misalignment system and method for a vehicle is known. Themethod comprises detennining When the vehicle is in a condition of traveling in asubstantially straight line; determining if a steering Wheel torque is required to maintainthe vehicle in the condition of traveling in a substantially straight line; and indicating a misalignment based upon the presence of such a steering Wheel torque.
    WO-20l0/ 107344 relates to a method for on-board diagnosis of a Wheel alignment of avehicle. This is achieved by using at least one parameter indicative for misalignmentWhich is selected from the group of steering angle, yaW rate, lateral acceleration, tyrefriction side force, functional dependence of steering angle from yaW rate. If the parameteris changed more than a predetermined limit an alarm may be issued so that the driver of the vehicle is inforrned that a Wheel misalignment Was detected.
    There is thus a problem in that vehicle components such as tyres and bushings undergoWear longer than necessary, Which may lead to higher costs, inter alia through causing higher fuel consumption.
    The general object of the present invention is therefore to make it easier and lessexpensive to detect, at an early stage, incorrectly set Wheel geometries and plays in steeredaxles or Wheel suspensions.
    A specific object of the present invention is to detect faults in the steering system at anearly stage on vehicles using active driver steering support systems, e. g. so-called lane keeping assist systems (LKA-systems).
    Summary of the invention The above objects are achieved With the invention defined by the independent claims.
    Preferred embodiments are defined by the dependent claims.
    The present invention is based upon the inventors” insight that a steering fault may be detected by analysing the steering assist control signal generated by the ADSS-system.
    Thus, according the present invention a steering assist control signal is analysed by comparing one or many control values of that signal to predetermined ideal control values.
    The ADSS system is adapted to receive one or many environmental signals, e. g. from oneor many cameras, laser measurement devices, an acceleration signal and/or positioningsystems (GPS). The environmental signals include e.g. information related to the ownvehicle”s position in relation to lane markers, and the distance to other vehicles. Inaddition the ADSS system is adapted to receive a steering activity signal generated inresponse of a steering activity, Which signal is generated When the driver turns the steeringWheel, i.e. performs a steering activity. The ADSS system is adapted to generate a steeringassist control signal in dependence of one or many of the applied environmental signals,the steering activity signal by applying a driving assist algorithm from a set of driving assist algorithms.
    According to the present invention the steering fault detection system is adapted to analysethe steering assist control signal generated by the ADSS system. If one or many steeringassist control values of the steering control signal deviates from a set of predeterminedideal steering assist control values an indication signal is generated Which indicates that a steering fault is detected.
    Thus, the invention relates to a method in a steering fault detection system for detection ofa steering fault of a vehicle, the vehicle comprises an active driver steering support(ADSS) system, e.g. a lane keeping assist (LKA) system, adapted to assist steering thevehicle at least in dependence of one environmental signal, e. g. a camera signal, and togenerate a steering assist control signal to a steering servo system of the vehicle, whereinsaid steering assist control signal includes one or many steering assist control values, characterized in that the method comprises: Applying said steering assist control signal to said steering fault detection system;Analysing said steering assist control values in relation to predetermined ideal steeringassist control values, and Generating an indication signal in dependence of said analysis, Wherein said indicationsignal includes steering fault information. The steering fault information includes e. g. themagnitude and direction of the steering fault, Which is used to identify e. g. incorrectly set Wheel geometries and plays in steered axles or Wheel suspensions.
    The predetermined ideal steering assist control values may be considered as ideal values,i.e. the values that Would be used if essentially no steering faults exist.
    These ideal steering assist control values may e. g. be detected and stored during the finaltesting of the vehicle before it is delivered from the factory, i.e. When essentially no steering faults should be present.
    According to one embodiment the ideal steering assist control values are stored in a table in a memory unit of the steering fault detection system.
    Thus, if the steering assist control values of the steering assist control signal deviate fromexpected ideal values an indication of a possible steering fault is generated. Furtheranalysis, e. g. at a workshop, may then be necessary in order to determine What actions to be performed.
    The method and system according to the present invention is applicable irrespectively if the vehicle is driving in a straight or curved direction.
    The expression faults in the steering system are to be interpreted broadly, and include e. g. incorrectly set wheel geometries and plays in steered axles or Wheel suspensions.
    By implementing the present invention it is possible to detect Wear and incorrect Wheelsettings at an early stage. Less Wear and less fuel consumption are thus achieved. Higherfuel consumption or increased Wear may be due to the vehicle tending to move obliquely because road Wheels are positioned obliquely even When the steering Wheel has not been turned in any direction, or when the vehicle's running is unstable, e. g. when the carriageway slopes.
    Brief description of drawings Figure 1 is a block diagram schematically illustrating steering fault detection systemaccording to the present invention.
    Figure 2 is a flow diagram illustrating the method according to the present invention.
    Detailed description of preferred embodiments of the invention With references to the appended drawings the invention will now be described in detail.
    In figure 1 a schematic block diagram is shown where the steering fault detection system 2is illustrated for detection of a steering fault of a vehicle. The vehicle comprises an activedriver steering support (ADSS) system 4, e. g. a lane keeping assist (LKA) system, adaptedto assist steering the vehicle at least in dependence of one environmental signal 6, e. g. acamera signal, a laser measurement signal, an acceleration signal and/or a positioningsignal (GPS-signal). The driver applies a steering activity on the steering wheel 18 and thesteering activity is applied to a steering servo system 10. The steering servo system 10 iscapable of control the steering by using a steering assist control signal from an ADSSsystem in combination with steering activity information related to the driver”s steeringactivity. A measurement unit 20 is adapted to sense one or many parameters representingthe steering activity, e. g. the steering angle and/or the yaw rate and to generate a steeringactivity signal 22 in dependence of the sensed parameter(s). The steering activity signal 22is applied to the ADSS system 4. Thus, the steering activity signal includes a representation of the driver”s steering activity, i.e. the intention of the driver.
    The ADSS system is adapted to generate a steering assist control signal 8 to a steeringservo system 10 of the vehicle, wherein the steering assist control signal 8 includes one ormany steering assist control values. The steering servo system then controls the steering of the road wheels 24. This is in accordance with the generally known use of ADSS systems.
    According to the invention the steering fault detection system 2 is adapted to receive thesteering assist control signal 8 and to analyse the steering assist control values in relationto predetermined ideal steering assist control values 12. An indication signal 14 is adaptedto be generated by said steering fault detection system 2 in dependence of the result of the analysis, Wherein the indication signal includes steering fault information.
    Preferably, the predetermined ideal steering assist control values 12 are values that Would be used if essentially no steering faults exist.
    According to one embodiment the ideal steering assist control values 12 are determinedduring final testing of the vehicle before it is delivered from the factory and then stored in a table in a memory unit 16 of the steering fault detection system.
    Alternatively, the ideal steering assist control values may be calculated in real-time basedupon the present situation, by using the current environmental signal 6 and the currentsteering activity signal 22. In that case those signals are applied directly to the steeringfault detection system 2, Which is indicated in figure 1 by dashed arroWs.
    In an exemplary situation Where the environmental signal 6 indicates that the vehicle ismoving straight ahead the mean ideal steering activity control signal 8 should beapproximately zero over a specified time period. However, if the control signal 8 deviatesmore than a pre-set threshold from zero it is an indication that a steering fault might existand an indication signal should be generated.
    The indicating signal is thus the result of analysis of the steering assist control values inrelation to the ideal steering assist control values. The difference between these valuesdefines a differential signal that may for example be allowed to deviate from pre-set threshold values.
    According to one embodiment the indication signal 14 is stored in the memory unit 16 andis later analysed over time, e. g. to identified long term trends in relation to the idealsteering assist control values. This analysis may preferably be performed at a Workshop during a scheduled service.
    In addition, or as an alternative, the indication signal 14 is generated and displayed to thedriver in order to indicate that a steering fault might exist. The steering fault information includes e. g. the type of the steering fault and/or the magnitude of the steering fault.
    Thus, the indication signal 14 may be communicated to the vehicle”s driver. It may also becommunicated to servicing staff, e. g. at the respective servicing Workshop. This may forexample be achieved by wireless transfer to a mobile telephone, a driving computer orother computer. This indication signal may cause various types of warnings to be issued.One type of indication signal might mean that there is a dangerous deviation in thesteering system which may require the vehicle to go immediately to a workshop becausethe detected state of the steering system might for safety reasons lead to having todiscontinue the journey. Another type of indication signal might entail shortening of theinterval before the next service. A further type of indication signal might mean the vehiclehaving to go to a workshop but on the basis of an assessment that the problem may be leftuntil the next service. In the first two cases it is desirable that the indication signal iscommunicated to both the driver and the workshop staff. In the third case it is sufficient that the signal is communicated to the driver.
    The present invention also relates to a method in a steering fault detection system fordetection of a steering fault of a vehicle. The method will now be described withreferences to the flow diagram shown in figure 2.
    As described above the vehicle comprises an ADSS system adapted to assist steering thevehicle at least in dependence of one environmental signal, e. g. a camera signal, and togenerate a steering assist control signal to a steering servo system of the vehicle (step A),wherein said steering assist control signal includes one or many steering assist controlvalues.
    The method according to the invention comprises: B - applying said steering assist control signal to said steering fault detection system; C - analysing said steering assist control values in relation to predetermined ideal steeringassist control values, and D - generating an indication signal in dependence of said analysis, wherein said indication signal includes steering fault information.
    The predetermined ideal steering assist control values are preferably values that Would beused if essentially no steering faults exist and may be determined during final testing of the vehicle before it is delivered from the factory.
    According to one embodiment the predetermined ideal steering assist control values arestored in a table in a memory unit of the steering fault detection system. The indicationsignal may also be stored in the memory unit to be later analysed over time e. g. to identifylong term trends.
    The steering fault information of the indication signal includes the type of fault and/or themagnitude of fault. The type of fault typically includes information of the direction of thesteering fault Which in turn may be used to further diagnose the fault, e. g. a specific bushing or bearing has been Worn out.
    In addition the present invention relates to a computer program product comprising computer program instructions for applying the method described above.
    The present invention is not limited to the above-described preferred embodiments.Various altematives, modifications and equivalents may be used. Therefore, the aboveembodiments should not be taken as limiting the scope of the invention, Which is defined by the appending claims.
    权利要求:
    Claims (13)
    [1] 1. A method in a steering fault detection system for detection of a steering faultof a vehicle, the vehicle comprises an active steering support (ADSS) system adapted toassist steering the vehicle at least in dependence of one environmental signal, e. g. acamera signal, and to generate a steering assist control signal to a steering servo system ofthe vehicle (step A), Wherein said steering assist control signal includes one or manysteering assist control values, characterized in that the method comprises: B - applying said steering assist control signal to said steering fault detection system; C - analysing said steering assist control values in relation to predeterrnined ideal steeringassist control values, and D - generating an indication signal in dependence of said analysis, Wherein said indication signal includes steering fault information.
    [2] 2. The method according to claim 1, Wherein said predetermined ideal steering assist control values are values that Would be used if essentially no steering faults exist.
    [3] 3. The method according to claim 1 or 2, Wherein said predetermined idealsteering assist control values are determined during final testing of the vehicle before it is delivered from the factory.
    [4] 4. The method according to any of claims 1-3, Wherein said predetenninedideal steering assist control values are stored in a table in a memory unit of the steering fault detection system.
    [5] 5. The method according to claim any preceding claim, Wherein said indication signal is stored and is later analysed over time.
    [6] 6. The method according to any preceding claim, Wherein said steering fault information includes type of fault and/or magnitude of fault.
    [7] 7. A steering fault detection system (2) for detection of a steering fault of a vehicle, the vehicle comprises an active driver steering support (ADSS) system (4) ll adapted to assist steering the vehicle at least in dependence of one environmental signal(6), e.g. a camera signal, and to generate a steering assist control signal (8) to a steeringservo system (10) of the vehicle, Wherein said steering assist control signal (8) includesone or many steering assist control values, characterized in that said steering faultdetection system (2) is adapted to receive said steering assist control signal (8) and toanalyse said steering assist control values in relation to predetermined ideal steering assistcontrol values (12), and that an indication signal (14) is adapted to be generated by saidsteering fault detection system (2) in dependence of said analysis, Wherein said indication signal includes steering fault information.
    [8] 8. The steering fault detection system according to claim 7, Wherein saidpredetermined ideal steering assist control values (12) are values that Would be used if essentially no steering faults exist.
    [9] 9. The steering fault detection system according to claim 7 or 8, Wherein saidpredetermined ideal steering assist control values (12) are deterrnined during final testing of the vehicle before it is delivered from the factory.
    [10] 10. The steering fault detection system according to any of claims 7-9, Whereinsaid predetermined ideal steering assist control values (12) are stored in a table in a memory unit (16) of the steering fault detection system.
    [11] 11. The steering fault detection system according to any of claims 7-10, Whereinsaid indication signal (14) is stored in a memory unit (16) and is later analysed over time to identified long tenn trends.
    [12] 12. The steering fault detection system according to any of claims 7-11, Wherein said steering fault information includes the type of fault and/or the magnitude of fault.
    [13] 13. A computer program product comprising computer program instructions for applying the method according to any of claims 1-6.
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    同族专利:
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    WO2014035320A1|2014-03-06|
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    EP2893294A4|2016-04-13|
    SE536762C2|2014-07-22|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
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    KR100774669B1|2006-09-18|2007-11-08|현대자동차주식회사|An auto calibration method of steering angle sensor for a lane keeping assist system|
    WO2010107344A1|2009-03-20|2010-09-23|Volvo Lastvagnar Ab|Method for onboard diagnosis of a wheel alignment of a vehicle and vehicle|
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    CN104590362A|2014-12-01|2015-05-06|中国第一汽车股份有限公司|Control device and controller for electric power steering system based on alternating current asynchronous motor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1250978A|SE536762C2|2012-09-03|2012-09-03|Method for detecting faults on the steering and a system for detecting faults on a vehicle's steering system|SE1250978A| SE536762C2|2012-09-03|2012-09-03|Method for detecting faults on the steering and a system for detecting faults on a vehicle's steering system|
    BR112015004148A| BR112015004148A2|2012-09-03|2013-08-28|steering failure detection method and steering failure detection system in vehicle steering system|
    EP13832296.1A| EP2893294B1|2012-09-03|2013-08-28|Method of detecting a steering fault, and a steering fault detection system of a vehicle's steering system|
    PCT/SE2013/051002| WO2014035320A1|2012-09-03|2013-08-28|Method of detecting a steering fault, and a steering fault detection system of a vehicle's steering system|
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