• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A device (10) for determining the type of tire of a vehicle, having: a temperature sensor (11), which emits a temperature signal | (Xt), which represents the instantaneous ambient temperature of the vehicle; a date sensor (12), which emits a date signal (Xd), which represents the current date; a position sensor (13), which emits a position signal (Xp), which represents the instantaneous position of the vehicle, and an evaluation device (14), which is arranged to evaluate the temperature signal (Xt), the date signal (Xd) and the position signal (Xp). and depending on these signals emit an output signal (Xout) which is indicative of the tire type of the vehicle.
    公开号:SE535451C2
    申请号:SE1050925
    申请日:2010-09-07
    公开日:2012-08-14
    发明作者:Volker Niemz
    申请人:Bosch Gmbh Robert；
    IPC主号:
    专利说明:

    535 45'l determine the distance traveled by each wheel, and may be stored as a reference value in a system memory.
    The wheel code length is directly dependent on the wheel radius. Consequently, if the absolute radius of the tire changes, the distance between two consecutive wheel code pulses also changes. This can lead to a difference appearing between the wheel code length stored as a reference value and the actual distance traveled by the vehicle between two wheel code pulses, which leads to errors in, for example, the pocket parking trajectories calculated by the parking assistance systems, or the estimated by the parking assistance system. the distance to the sidewalk. Such a discrepancy can occur in particular when changing from summer tires to winter tires or vice versa.
    EP 1 510 427 A2 describes the determination of the tire type of a vehicle by means of a slip comparison, in which slip values for all tires are compared with each other.
    Summary of the invention - The device according to the invention for determining the type of tire of a vehicle has the following: a temperature sensor, which emits a temperature signal, which represents the instantaneous ambient temperature of the vehicle; a date sensor, which emits a date signal, which represents the current date; a position sensor, which emits a position signal, which represents the instantaneous vehicle position, and an evaluation device, which is arranged to evaluate the temperature signal, the date signal and the position signal and depending on these signals emit an output signal which is indicative of the vehicle tire type or represents the vehicle. tire type. 10 15 20 25 30 535 451 The idea on which the invention is based consists in determining the type of tire used on the vehicle on the basis of external information. This estimation can be done by a relatively simple decision matrix or an algorithm representing such a decision matrix. It is advantageous here that no complicated calculations are required, which is the case, for example, when determining the type of tire from slip values. Consequently, system resources in the form of computation time can be saved.
    The device can furthermore have a memory in which two values are stored, whereby the evaluation unit reads out and outputs one of the two stored values as output signal. Since in principle the information "summer" in "winter" is sufficient for the results of the estimation, and a prevailing applied tire radius is sufficient for the determination of the wheel code length, it is sufficient to store only these two values in a memory, so that storage space can be saved.
    In one design, these two values represent the radius of a winter tire and the radius of a summer tire, respectively. From these radii, the wheel code length can then be determined computationally. Alternatively, it is also possible that the two respective values represent the distance traveled by the vehicle between two consecutive wheel code pulses in a winter tire and in a summer tire, respectively. This saves the arithmetic determination of the wheel code length from the tire radii.
    The position sensor can be, for example, a GPS sensor.
    In one embodiment, the evaluation device emits an output signal which is indicative of a summer tire in the event that the date transmitter emits a date signal corresponding to one month in a predetermined monthly range.
    In addition, the device may further have a climate data memory, in which geographical positions are assigned predetermined lowest monthly temperatures, the evaluation unit being arranged to, on the basis of the position specified by the position signal and the date signal specified by the date sensor, determine the minimum monthly temperature for the instantaneous month in the instantaneous location of the vehicle, and emit an output signal indicative of a summer tire in the event that the minimum monthly temperature is greater than a predetermined value.
    Furthermore, the device may have a day temperature memory, which is arranged to store the temperature measured and averaged by the temperature sensor from a certain number of days, the evaluation unit emitting an output signal indicative of summer tires in case one or more of the temperatures in the day temperature memory exceeds a certain value.
    The device described above may be part of a parking assistance system.
    The method according to the invention for determining the tire type of a vehicle has the following steps: generating a temperature signal which represents the current ambient temperature of the vehicle; generating a date signal, which represents the current date; generating a position signal which represents the instantaneous vehicle position, and evaluating the temperature signal, the date signal and the position signal and outputting an output signal which is indicative of the tire type of the vehicle.
    Brief description of the figures Figure 1 shows a block diagram of a device according to the invention for determining the tire type of a vehicle.
    Figure 2 is a flow chart of a method according to the invention for determining the type of tire of a vehicle. 10 15 20 25 30 535 451 Figure 3 shows an example of a climate table with the lowest monthly temperatures.
    Embodiment Figure shows a block diagram of an apparatus 10 according to the invention for determining the tire type of a vehicle. This device 10 comprises a temperature sensor 11, a date sensor 11, a position sensor 13, an evaluation unit 14 and a memory 15.
    The temperature sensor 11 emits a temperature signal Xt, which represents the instantaneous ambient temperature of the vehicle, and can for instance be realized as a temperature sensing means on the vehicle chassis or the like.
    The date sensor 12 emits a date signal Xd, which represents the current date. The date signal Xd can be emitted in the form "day / month / year" or "day / month" or similar. The date can be derived from a system clock or a similar timer. The position sensor 13 emits a position signal Xp, which represents the instantaneous geographical vehicle position. The position sensor 13 can, for example, be designed as a GPS sensor. Alternatively, it can also be designed to receive signals from terrestrial transmitters, which can, for example, be set up along traffic routes.
    The evaluation device 14 can be designed as a program-controlled device, for example as a microprocessor or the like. It can furthermore also be realized by a microprocessor or a control electronics, which in addition to the one described here also observes other control tasks.
    The evaluation device 14 evaluates the temperature signal Xt, the date signal Xd and the position signal Xp and, depending on these signals, outputs an output signal Xout, which is indicative of the tire type of the vehicle in which the device is arranged. This evaluation can be done according to the procedure described below. 10 15 20 25 30 535 451 The memory 15 can for instance be realized by a flash memory or the like. In the memory 15, two values are stored, of which one value corresponds to a summer tire parameter and the other to a winter tire parameter. For example, one value may represent the radius of a summer tire and the other value the radius of a summer tire. The evaluation unit 14 then selects one of these two values according to the method described below and outputs it as output signal Xout. The values stored in the memory 15 are advantageously located in the middle of the tolerance band or value range for the respective tire type, so that the error in the event of deviations from the actual tire radius from the stored radius values.
    Figure 2 shows a method according to the invention for determining the tire type of a vehicle. In step S10, the temperature sensor 11, the date sensor 12 and the position sensor 13, respectively, supply a temperature signal Xt, a date signal Xd and a position signal Xp, respectively, to the evaluation unit 14.
    In step S20, the evaluation unit 14, with the aid of the position signal, determines the country in which the vehicle is located. This can be done, for example, by comparing the position signal Xd with map data stored in the memory 15. In step S30, it is then determined on the basis of the date signal_Xd, whether there is a winter tire obligation in this country at the moment. For example, in Italy and also in Hungary from 15 October to 15 April, there is a general winter tire obligation. In Finland, there is a winter tire obligation from 1 December to the end of February. Thus, if in step S30, for example, it is determined that the vehicle is located in Finland and the date signal shows that the current date is 5 December, it can be concluded that a winter tire obligation exists, and that the vehicle is equipped with winter tires. Thus, if it is determined that in the country in which the vehicle is at the moment there is a winter tire obligation, the procedure jumps from step S30 to S80. Otherwise, if there is no winter tire obligation, the procedure jumps from step S30 to step S40. Whether winter tire duty exists in a particular country can be determined, for example, by reading a table stored in memory 15, in which countries are correlated with time frames for winter tire duty. In step S40, the evaluation device 14, based on the date signal Xd, determines whether the current month falls within a predetermined monthly range, in the present example, whether the current month falls within the range from September to May. If this is the case, the procedure jumps to step S50, otherwise, ie if the current month falls within the range from June to August, the procedure jumps to step S70. In step S50, the evaluation device 14, on the basis of the position indicated by the position signal and the date signal specified by the date transmitter, determines the lowest monthly temperature for the month at the moment of location of the vehicle. For this purpose, climate tables for different localities and regions are stored in memory 15, in which tables the lowest monthly temperatures for each month for predetermined localities are stated. The memory 15 thus also functions here as a climate data memory. An example of such a climate table is shown in Figure 3. In this case, the evaluation unit 14 first selects one of the saved climate tables, for example the climate table for the place where the vehicle is closest. If for the current month the lowest monthly temperature shown in the climate table corresponding to the instantaneous position is less than a predetermined temperature, for example less than 0 ° C, then the procedure jumps to step S60, otherwise it jumps to step S70. In step S60, the evaluation unit 14 determines whether the average temperature for the last 4 days, for example, is less than a predetermined temperature, for example less than 7 ° C. For this purpose, the evaluation unit 14 can daily determine the average temperature and store it in the memory 15, which consequently also functions here as a daily temperature memory. Alternatively, it is possible that the average temperatures for the last 4 days are read in from an external source, ie for example transmitted via radio or the like. During the last 4 days, the average temperatures were at least less than, for example, 7 ° C, the procedure jumps to step S80, otherwise it jumps to step S70. In step S70, the evaluation unit 14 reads the radius stored in the memory 15 of a summer tire and outputs this value as output signal Xout, i.e. as a value, which is indicative of a summer tire. In step S80, on the other hand, the evaluation unit 14 reads the radius of a winter tire stored in the memory 15 and outputs this value as output signal Xout, i.e. as a value, which is indicative of a winter tire. Then the procedure ends. The procedure described above can, for example, be carried out within the framework of an initialization at the start of the vehicle.
    In a further step, not further described, the evaluation device 14 or a control electronics connected thereto from this tire radius can determine the wheel code length (WIC length; WIC = wheel impulse counter), i.e. the distance traveled by the vehicle in straight travel between two on successive wheel code pulses. Depending on the structure of the wheel code, for example, 48 or 92 pulses are generated per wheel rotation. The wheel code length is then between 2 cm (48 impulses) and 4 cm (92 impulses), and can be directly derived from the tire radius. Alternatively, it is also possible to directly store the two wheel code lengths corresponding to summer tires and winter tires, respectively, in the memory 15, and to output these as output signal Xout. Since these two wheel code lengths correspond to a respective tire type, an output signal Xout is also emitted in this case, which is indicative of the vehicle's tire type or the currently fitted tires. In this case, the conversion of the tire radius to a wheel code length is omitted. The wheel code length determined in this way can be used in a driving assistance system, such as a parking assistance system.
    With the method described above, a conclusion can thus be drawn from the determined type of tire (summer / winter) regarding the absolute wheel code length.
    Since there is a standardized set of summer and winter wheels for each vehicle, vehicle-specific values are stored in the memory 15. The rim size 10 15 20 25 30 535 451 thus plays only a very minor role. The absolute radius of the tires for the two tire types in summer and winter, respectively, depending on the environmental conditions, always moves within a very narrow range of values. This depends on the vehicle, however, is generally at 10.5 1.1%. Between summer and winter tires, on the other hand, there can be a fairly large variation in tire radius, which (depending on the vehicle) can amount to 2,10%. Such a variation leads to the same variation of the road distance between two successive wheel code pulses. Accordingly, with the invention determining the type of tire, a substantially more precise setting of the applied wheel code length and consequently a more accurate determination of the road distance can take place. Although the invention has been described above with reference to preferred embodiments, it is not limited to these, but is modifiable in many ways. In particular, different features of the designs described above are compatible with each other.
    It is also possible to use additional environmental factors for the evaluation.
    For example, it is possible to also take into account the vehicle's instantaneous height above zero. For this purpose, for example, an altitude sensor (not shown) may be provided, which emits an altitude signal, which represents the instantaneous height of the vehicle. Alternatively, the instantaneous height can be determined by referring to map data stored in the memory, taking into account the instantaneous position. The instantaneous height can be taken into account in such a way that for certain months it is concluded that winter tires are available from a certain minimum height.
    Similarly, the longitude and latitude parameters, which are determined from the position signal, can also be taken into account in the evaluation. Generally speaking, based on the three parameters "date", "position" and "average temperatures for the last x days", it is possible to provide a three-dimensional decision matrix (for example as Fuzzy Logic) and store it in memory 15, which is then invoked of the evaluation unit 14. 535 451 10 Furthermore, the determined value of the wheel code length is not only useful for the pocket parking system, but also for other driving assistance functions such as ACC, video applications or speed processing in a combined instrument panel.
    Furthermore, it is also possible to combine the tire type estimation according to the invention with other methods, for example tire type estimation via slip or tire type estimation via detected deviations from the runway.
    权利要求:
    Claims (14)
    [1]
    Device (10) for determining the radius and / or wheel code length for different types of tires of a vehicle, comprising: a temperature sensor (11), which emits a temperature signal (Xt), which represents the instantaneous ambient temperature of the vehicle; a date sensor (12), which emits a date signal (Xd), which represents the current date; a position sensor (13), which emits a position signal (Xp), which represents the instantaneous position of the vehicle, and an evaluation device (14), which is arranged to evaluate the temperature signal (Xt), the date signal (Xd) and the position signal (Xp). and depending on these signals emit an output signal (Xout) which is indicative of the tire type of the vehicle, the signal (Xout) representing the radius of a winter tire and the radius of a summer tire, respectively, or the signal (Xout) representing the wheel code length of a winter tires and the wheel code length of a summer tire.
    [2]
    The device (10) according to claim 1, further having a memory (15) in which two values are stored, the evaluation unit (14) reading out one of the two stored values and outputting this as an output signal (Xout).
    [3]
    The device (10) of claim 2, wherein the two values represent the radius of a winter tire and the radius of a summer tire, respectively, or the two values represent the distance traveled by the vehicle between two consecutive wheel code pulses of a winter tire and a summer wheels.
    [4]
    Device (10) according to any one of the preceding claims, wherein the position sensor (13) is designed as a GPS sensor. 10 15 20 25 30 535 451 12
    [5]
    Device (10) according to any one of the preceding claims, wherein the evaluation device (14) emits an output signal (Xout) indicative of a summer tire if the date sensor (12) emits a date signal (Xd) which corresponds to one month in a predetermined monthly range.
    [6]
    Device (10) according to any preceding claim, further having a climate data memory, in which geographical positions are assigned predetermined minimum monthly temperatures, wherein the evaluation unit (14) is arranged to, on the basis of the position indicated by the position signal (Xp) and the the date signal (Xd) emitted by the date transmitter (12d) determine the lowest monthly temperature for the vehicle's instantaneous location, and emit an output signal (Xout) indicative of summer tires if the lowest monthly temperature is higher than a predetermined value.
    [7]
    A device (10) according to any preceding claim, further having a day temperature barrel, which is arranged to store the temperature measured by the temperature sensor (11) and averaged for a respective day from a certain number of days, the evaluation unit (14) emits an output signal (Xout) which is indicative of a summer tire if one or more of the temperatures in the daytime temperature range exceeds a certain value.
    [8]
    Parking assistance system, having a device (10) according to any preceding claim.
    [9]
    A method for determining the radius and / or wheel code length for different tire types of a vehicle, comprising the steps of: generating a temperature signal (Xt), which represents the instantaneous ambient temperature of the vehicle; Generating a date signal (Xd), which represents the current date; generating a position signal (Xp), which represents the instantaneous position of the vehicle, and evaluating the temperature signal (Xt), date signal (Xd) and position signal (Xp) and, depending on these signals, outputting an output signal (Xout), which is indicative for the tire type of the vehicle, the signal (Xout) representing the radius of a winter tire and the radius of a summer tire, respectively, or the signal (Xout) representing the wheel code length of a winter tire or the wheel code length of a summer tire.
    [10]
    A method according to claim 9, wherein one of two stored values is selected as the output signal (Xout).
    [11]
    A method according to claim 10, wherein the two values represent the radius of a winter tire and the radius of a summer tire, respectively, or the two values represent the distance traveled by the vehicle between two consecutive wheel code signals of a winter tire and a summer tire, respectively.
    [12]
    A method according to any one of claims 9 to 11, further comprising: comparing the current month represented by the date signal (Xd) with a predetermined monthly range, wherein in the dispensing step an output signal (Xout) is emitted, which is indicative of a summer tire. , if the current month corresponds to one month in this monthly range.
    [13]
    A method according to any one of claims 9 to 12, further comprising: determining a minimum monthly temperature for the instantaneous month at the instantaneous location of the vehicle by correlating the position signal (Xp) emitted by the position sensor (13) and that of the date sensor ( 12) 10 15 535 451 14 emitted date signal (Xd) with local minimum temperatures stored in a climate data memory, whereby in the emission stage an output signal (Xout) is emitted, which year is indicative of a summer tire, if the established minimum monthly temperature is greater than a predetermined value.
    [14]
    A method according to any one of claims 9 to 13, further comprising: calculating an average daily value over a respective day from the temperature signal, storing the daily average values for a certain number of days in a daily temperature memory, wherein in the dispensing step an output signal is emitted, which is indicative of a summer tire, if one or fl era of the temperature values in the daytime temperature memory exceeds a predetermined value.
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    同族专利:
    公开号 | 公开日
    FR2949740B1|2015-07-03|
    SE1050925A1|2011-03-09|
    FR2949740A1|2011-03-11|
    DE102009029272A1|2011-03-10|
    引用文献:
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    法律状态:
    2015-05-05| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102009029272A|DE102009029272A1|2009-09-08|2009-09-08|Device for use in parking assistance system for determining types of tire of vehicle, has temperature sensor, which provides temperature signal and represents momentary ambient temperature of vehicle|
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