• 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 method for determining the rolling rivet ignition of a nine-vehicle vehicle, wherein the rolling rivet ignition is calculated depending on the driving resistance values, an average value of the driving resistance values being formed over a traveled mileage depending on the reduced mileage intervals and the rolling rivet ignition being calculated.
    公开号:SE536561C2
    申请号:SE1250539
    申请日:2012-05-28
    公开日:2014-02-18
    发明作者:Maik Wuerthner；Joachim Staudinger；Johannes Kemler
    申请人:Zahnradfabrik Friedrichshafen；
    IPC主号:
    专利说明:

    536 561 interval of the mileage depending on a vehicle speed, an average value being determined from the driving resistance values thus determined, and wherein the average value of the rolling resistance is calculated by means of the following formula: F_ROLL = F_FW_MW / (m * g), where F_ROLL is the rolling resistance, where F_FW_MW is the mean value of the driving resistance values, where m is the mass of the motor vehicle and where g is the gravitational constant. According to this advantageous further development, the average value of the driving resistance values is thus determined not depending on time, but over the distance traveled in defined mileage intervals. It follows that the rate for determining the driving resistance values as well as for determining the average value depends on the driving speed. This approach allows a particularly advantageous determination of the rolling resistance.
    The control device for carrying out the method is defined in claim 6.
    Preferred developments of the invention appear from the subclaims and description below. Exemplary embodiments of the invention are explained in more detail with the aid of the drawings, without being limited thereto. In this case: Fig. 1 shows a driveline diagram for a motor vehicle, and Fig. 2 a diagram for clarifying the method according to the invention for determining the rolling resistance of a motor vehicle.
    Fig. 1 shows very diagrammatically a driveline diagram for a motor vehicle, wherein a rolling resistance of the motor vehicle is to be determined by the present invention.
    Fig. 1 shows that the driveline of the motor vehicle comprises a drive unit 1, a transmission 2 and a power take-off 3, the transmission 2 being connected between the drive unit 1 and the power take-off 3.
    The operation of the drive unit 1 is controlled or regulated by a motor control device 4.
    The operation of the transmission 2 is controlled or regulated by a transmission control device 5. According to Fig. 1, the motor control device 4 for this data exchanges data with the drive unit 1 and the transmission control device 5 with the transmission 2. In addition, the motor control device 4 and the transmission control device 5 exchange data with each other.
    It is assumed below that the rolling resistance of the motor vehicle is determined by means of the transmission control device 5. In contrast, however, it is also possible for the determination of the rolling resistance to take place in the motor control device 4 or in another control device of the motor vehicle.
    According to the invention, the procedure for determining the rolling resistance of a motor vehicle is such that a driving resistance value is determined over a distance traveled in defined mileage intervals, i.e. always after a defined distance traveled 536 561 mileage. From the driving resistance intervals determined for the travel distance intervals, an average value is formed, whereby the rolling resistance is calculated from the average value of the driving resistance values.
    The above determination of driving resistance value and averaging from the driving resistance values thus takes place not time-dependent with a time rate that is always the same, but for the distance traveled in always the same, defined driving distance intervals, whereby the rate of determination of driving resistance values depends on the rate of averaging of the driving resistance values determined for the mileage intervals. For each defined mileage interval, a driving resistance value is thus determined, which has an effect on the average value formation of the resistance values.
    From the average value of the driving resistance values, the rolling resistance is then calculated using the following formula: F_ROLL = F_FW_MW / (m * g) where F_ROLL is the rolling resistance, where F_FW_MW is the average value of the driving resistance values, where m is the mass of the motor vehicle and where g is the gravitational constant.
    Information on the distance traveled as well as on the vehicle speed, on which the rate for determining driving resistance values, the rate of averaging and thereby the rate for calculating the rolling resistance depends, is known in a control device, in particular the transmission control device 5, which performs the method according to invention, or provided to it as input sizes.
    Further details of the method according to the invention are described below with the aid of the signal flow diagram according to Fig. 2.
    A block 6 of the signal fl fate diagram according to Fig. 2 clarifies a start of the method according to the invention for determining the rolling resistance.
    After starting the method according to the invention, a block resistance value for the motor vehicle is determined in a block 7 per defined mileage interval, this determination of the driving resistance being well known to the person skilled in the art.
    Thereafter, in a block 8, the average value of the determined driving resistance values is determined, whereby in a subsequent block 9 the rolling resistance is calculated from the average value of the driving resistance values.
    Preferably, the averaging in block 8 is performed in the form of a sliding, arithmetic averaging via a defined, fixed number of successive driving resistance values.
    It can be arranged that in order to determine such a moving average value, a defined number of N successive driving resistance values is always used, whereby a new driving resistance value always replaces the oldest driving resistance value of the defined number of consecutive N driving resistance values.
    For this it is necessary to store all the driving resistance values in the defined number N consecutive driving resistance values eg in a circular buffer in the control device, which performs the method according to the invention, in order to always replace the oldest driving resistance value with the always newest driving resistance value and to determine a current, arithmetic mean value based on the current number N of successive driving resistance values via the moving average formation, and on that basis then calculate the rolling resistance in block 9.
    Accordingly, for storing these driving resistance values, the control device 5 comprises a memory 10, whereby the calculation of the average value as well as the rolling resistance takes place in a processor 11 of the control device.
    As already mentioned, the formation of a moving, arithmetic mean presupposes storage of the individual driving resistance values over the fixed fixed number N of successive driving resistance values, whereby relatively large memory space is used in the control device 5, namely in the memory 10 itself.
    In contrast, it is also possible to determine an arithmetic mean over a variable number of consecutive driving resistance values so that, when there is a new driving resistance value, this driving resistance value is added to the previous sum of driving resistance values, that the number driving resistance values are increased and, depending on this, the arithmetic mean value is determined.
    In this case, the individual driving resistance values do not need to be stored in the control device 5, but only the always current sum of the previous driving resistance values as well as the number of driving resistance values, which affect the sum formation. As a result, the utilized memory space can be reduced.
    The determination of the rolling resistance as above can be carried out over a total run along a driving distance. After a motor vehicle has been switched off and after the ignition has been switched off, the last determined average value of the driving resistance is preferably stored in the memory 10 of the control device 5, whereby after a new start of the motor vehicle this last stored value of the driving resistance is used to determine a starting value of the rolling resistance. Since, after restarting the motor vehicle, a new average value of the driving resistance values is determined on the basis of the procedure described above, this can be done by deducting the newly determined average value of the driving resistance values with the last determined and stored in the control device 5 to give a weighting, and depending on such a weighted average value, the rolling resistance is calculated. 10 536 561 The weighting of the newly determined average value then depends on the number of driving resistance values that are available to determine the new average value.
    As already explained, the method according to the invention can be carried out constantly during the operation of the motor vehicle, without there having to be a defined driving situation. As a result, changes in the rolling resistance can be constantly determined, in order to provide a current rolling resistance value for steering and / or regulation of a motor vehicle.
    权利要求:
    Claims (7)
    [1]
    A method for determining the rolling resistance of a motor vehicle, wherein the rolling resistance is calculated depending on the driving resistance values, by forming an average value of the driving resistance values over a traveled mileage depending on the fi reduced driving range intervals and wherein the rolling resistance is calculated from the mean over a distance traveled, a travel resistance value is determined for each defined mileage interval of the mileage at a rate which depends on a driving speed, that the average value is determined by the driving resistance values determined for each defined mileage interval and that the rolling resistance is calculated from the average value. F_ROLL = F_FW_MW / (m * g), where F_ROLL is the rolling resistance, where F_FW_MW is the mean value of the driving resistance values, where m is the mass of the motor vehicle and where g is the gravitational constant.
    [2]
    Method according to Claim 1, characterized in that a moving, arithmetic mean value is determined as an average value via a defined, fixed number of consecutive driving resistance values, a new driving resistance value always replacing the oldest driving resistance value from the defined number of consecutive driving resistance values.
    [3]
    Method according to claim 1, characterized in that an average value is determined as an arithmetic average value over a variable number of consecutive driving resistance values so that a new driving resistance value is added to a sum of previous driving resistance values, that the number of driving resistance values is increased and determined accordingly. the mean.
    [4]
    Method according to one of Claims 1 to 3, characterized in that a newly determined average value for the driving resistance values is deducted from the last determined average value for the driving resistance values with a weighting which depends on the number of driving resistance values available and that depending on an average weight weighted in this way is calculated by the rolling resistance,
    [5]
    Control device for a motor vehicle, characterized in that it has means for carrying out the method according to any one of claims 1-4.
    [6]
    Control device according to claim 5, which has a processor which, over a distance traveled, determines a travel resistance value for each defined travel interval of the travel distance at a rate which depends on the travel speed, which from the travel resistance values determined for each defined travel interval determines the mean value and which from the average of the driving resistance value, the rolling resistance 536 561 calculates with the following formula: F_ROLL = F_FW_MW / (m * g), where F_ROLL is the rolling resistance, where F_FW_MW is the average of the driving resistance values, where m is the mass of the motor vehicle and where g is the gravitational constant.
    [7]
    Control device according to claim 5 or 6, wherein it has a memory in which driving resistance values and / or an average value of the driving resistance values and / or a rolling resistance are stored.
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    同族专利:
    公开号 | 公开日
    SE1250539A1|2012-12-01|
    DE102011076812A1|2012-12-06|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102009026687A1|2009-06-03|2010-12-09|Zf Friedrichshafen Ag|Method for determining rolling friction of lorry, involves computing rolling friction factor from driving resistances, vehicle mass and acceleration due to gravity, where driving resistances are stored for determination of rolling friction|
    法律状态:
    2015-02-24| NUG| Patent has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    DE102011076812A|DE102011076812A1|2011-05-31|2011-05-31|Method for determining rolling resistance of motor car, involves forming mean value from traction resistance values over distance traveled based on defined travel track intervals, and computing rolling resistance based on mean value|
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