DE102008046232A1 - Holding voltage determining method for clutch servomotor of vehicle, involves adjusting assumed holding voltage values for number of clutch actuator positions by comparison of actual holding voltage with values of assumed holding voltage - Google Patents

Abstract

The method involves obtaining values of an assumed holding voltage for a clutch actuator position from a stored characteristic diagram. An actual holding voltage for the clutch actuator position is determined. The actual holding voltage is compared with the values of the assumed holding voltage. The holding voltage values assumed from the characteristic diagram are adjusted for a number of clutch actuator positions by the comparison of the actual holding voltage with the values of the assumed holding voltage.

Description

The The present invention relates to a method for determining a holding voltage of an engine, in which one, with the motor functionally connected, Clutch actuator of an automated manual transmission motionless remains, according to the first independent claim 1.

In automated manual transmissions, for example parallel shift transmissions, Couplings are used, which are self-sufficient in an emergency have to rise. Except for emergency situations The self-opening of the clutch also serves to provide a positional referencing the clutch actuator is easily possible.

From the DE 100 27 330 A1 It is known to determine the positioning of a movably arranged element in a switching device or an element coupled thereto on the basis of other characteristic values, for example by means of electrical currents or the like. In order to accurately determine the position in such a system, it is necessary to accurately determine the limits to which the motion actuator remains motionless in an actuator load. If these limits are not known exactly, this could lead to errors in the position calculation.

Out WO 2007/05451 For example, a method and apparatus is known that allows an upper and a lower holding voltage to be determined for each clutch actuator position. However, this method is very expensive, since the holding voltages must be determined for a large number of Kupplungsaktorpositionen.

at commissioning or after a repair of the vehicle or the corresponding clutch are available for the control of Clutch a predetermined load pilot map, the corresponding includes predetermined holding voltage limits, for. B. in an in-vehicle Memory available. This load pre-control map should, because the production at the end of the tape only a limited time available stands as fast as possible on the actual properties be adapted to the clutch actuator. Will do the above Method used and for each actuator position over an iterative path determines the upper and lower holding voltage, this takes too much time.

task The invention is to provide a method and a device, which allow a predetermined load control map in a short time adapt to the appropriate clutch actuator.

The Task is solved by the independent claims 1 and 9.

preferred Embodiments can be found in the subclaims.

Especially the problem is solved by a method for determining a holding voltage of an engine, in which one, with the motor functionally connected, Clutch actuator of an automated manual transmission motionless remains. This method comprises the steps of: determining a ΔUvor value a given, supposed holding voltage for a Coupling actuator position from a stored map, determination the actual holding voltage for this clutch actuator position, comparison the actual holding voltage with the predetermined holding voltage, Adapting the predetermined holding voltage values from the map for a variety of clutch actuator positions.

Especially the above motor is connected to the clutch actuator so that the engine can move the clutch via the clutch actuator. The engine may be part of the clutch actuator.

Under A map in this application is a plurality of holding voltage values understood that are suitable for a plurality of clutch actuator positions result.

In a first step is preceded by a ΔU value or several ΔU values one or more supposed holding voltages from a stored Map read out. This one value or these several values ΔUvor can be specified either in the production of the clutch or obtained earlier from measurements and stored in one or more memories.

In a second step is the actual holding voltage for a clutch actuator position, e.g. B. a predetermined Clutch actuator position determined. This step can also be be performed before the first step. Such Determination can z. B. the operation of the clutch actuator and the detection of the reactions of the clutch actuator or the clutch or the vehicle comprising the clutch.

In Another step is the actual holding voltage compared with the supposed holding voltage. Such a comparison can z. B. a difference between the actual holding voltage and the supposed holding voltage include, also the quotient between the actual holding voltage and the supposed one Holding voltage can be determined.

In a subsequent step will become the supposed ones Holding voltage values from the map according to the comparison between the actual holding voltages and the supposed Holding voltage for a plurality of clutch actuator positions, So also for clutch actuator positions, for no actual holding voltages have been detected, customized.

Especially can be an upper Uup and a lower holding voltage Udn for a clutch actuator position or to multiple clutch actuator positions be determined. Uup gives a highest holding voltage value for a particular clutch actuator position in which the clutch actuator or the clutch is not or only minimally moved. Udn describes a smallest voltage applied to the motor must be, so that the clutch actuator at a certain Clutch actuator position not moved or only minimally moved.

The lower holding voltage Udn does not have to be zero, since in particular with self-closing couplings, the clutch actuator moves when no holding voltage is applied to the motor.

By the determination of the upper and lower limit of the holding voltage can the actual holding voltage range can be determined and thus the stored map more accurate to the actual Conditions are scaled.

Especially can use scaling factors from the comparison between the supposed and the determined holding voltage or from the supposed and the determined holding voltages are calculated. Such scaling factors can by the quotient formation between the supposed and the determined holding voltages are pulled.

The supposed holding voltage values are then multiplied with the scaling factors on the actual conditions customized. This can be done relatively quickly for a variety of clutch actuator positions a realistic map can be obtained.

Out the majority of the newly calculated holding voltages can z. B. by Interpolations a new map can be determined. So have to not all actually possible clutch actuator positions driven through and or all supposed holding voltages for possible clutch actuator positions are stored, but a plurality of support positions can be stored be and from these supporting values the maps are interpolated. This saves both time in determining the holding voltages as also storage space.

Furthermore, the actual holder voltage for the clutch actuator positions can be determined by the following method.
Increasing or decreasing the holding voltage by an increment ΔU starting from the predetermined holding voltage ΔUbefore ΔUakt = ΔUvor ± ΔU.

To capture, whether the clutch actuator at the changed holding voltage .DELTA.Uakt emotional. In this case, the increment .DELTA.U can be both predetermined, as well as from the supposed, stored holding voltage data result. The detection of whether the clutch actuator moves can over a sensor is done, the position or movement of the clutch actuator, of the engine or the change in vehicle behavior detected. Such a sensor can z. B. be an incremental odometer. Such Incremental Wegmesser can be integrated in the clutch actuator be.

Especially the above procedure can be repeated until the clutch actuator and thus the clutch moves. It occurs However, in place of the predetermined or stored holding voltage .DELTA.Uvor the holding voltage ΔUakt applied in the above step.

Description of a preferred embodiment

in the Below is a preferred embodiment with reference to Drawings without limiting the scope of the application.

In the drawings shows:

1 a diagram in which the upper and lower holding voltage is plotted against the clutch actuator position,

2 a flow chart for the method according to the invention,

3 a flowchart showing the sequence of the step "adaptation",

4 a flowchart for the step "scaling".

1 shows a holding voltage map comprising the lower holding voltage limit 1 with the supporting values 1''' and the interpolated values in between. In addition, an upper holding voltage curve 2 with the supporting values 2 ''' for different clutch actuator positions. This map can an electronic storage medium such. B. a memory chip are stored, for. B. in which the support values 1''' and 2 ''' for the predetermined clutch actuator positions 5 mm 15 mm 26 mm 31 mm and 35 mm are stored.

In a further step, for a clutch actuator position, preferably for a clutch actuator position, a backup value 2 ''' in the predetermined holding voltage curve 2 is assigned, the upper holding voltage 2 '' or the lower holding voltage 1'' determined. Thereafter, a scaling factor is determined by the determined holding voltage values 1'' respectively. 2 '' divided by the predetermined holding voltage values. These scaling factors then multiply the remaining predetermined holding voltage values at the remaining clutch actuator positions to obtain the remaining adapted holding voltage values.

In 2 the procedure is outlined in outline by means of a flow chart.

In a first step is the upper withstand voltage limit Uup, ada, n by an iterative procedure for a predetermined actuator position n determined. In a further step, the lower holding voltage limit Udn, ada, n determined for the same clutch actuator position n.

To the receipt of the two holding voltage values Uup, ada, n and Udn, ada, n corresponding scaling factors Sup and Sdn are calculated. These scaling factors then become the corresponding support values scaled the predetermined holding voltage field and so after interpolating the new support values a new, adapted holding voltage field receive.

In another embodiment, only a holding voltage limit, prefers the lower holding voltage limit Udn, ada, n for a clutch actuator position n determined. From this holding voltage limit can then with the help of the predetermined lower holding voltage limit for the same clutch actuator position, a scaling value Sdn be calculated. This scaling value can then be used to scale Both the upper and lower holding voltage values are used become.

3 shows the method steps to determine a holding voltage value Udn, ada, n or Uup, ada, n for a clutch actuator position n.

In a first step is a holding voltage value U_vor from the given Holding voltage load field read. This value can be both from a internal vehicle memory read as well as from an external Memory to be transferred.

Subsequently is determined whether a lower or an upper holding voltage limit for the clutch actuator position n is to be measured.

Should a lower holding voltage limit is obtained, the voltage value becomes U_vor applied to the engine of the clutch actuator and via a Inkrementalwegmessung the information received, whether the clutch opens.

opens If the clutch, then the U_vor with a predetermined value .DELTA.U added and the value U_tat received. Now U_tat becomes the clutch actuator created and measured again, whether the clutch continues to open. It may be necessary to return the clutch to the clutch actuator position in an intermediate step n be driven to obtain identical measurement conditions.

opens If the clutch continues, U_tat will be ΔU long added until the clutch has come to a standstill, or itself only minimally moved. If this is the case, then the voltage applied to the engine Value U_tat assumed as a new adapted holding voltage value U_ada. Then either the adaptation procedure for a lower hold voltage value or the scaling routine began.

opens If the coupling does not occur when the predetermined lower holding voltage limit U_vor is applied, U_tat is equated with U_vor - ΔU. U_tat is then applied to the engine and determines whether the clutch opens. opens the clutch, it can be assumed as a new adapted value U_ada = U_tat + ΔU and the scaling routine are started or an upper one Holding voltage value can be determined. Opens view the clutch not so again a value .DELTA.U is subtracted from U_tat until the clutch opens.

Should an upper withstand voltage limit is determined first determines whether the clutch when applying the predetermined holding voltage closes. Does not close the clutch, so U_tat = U_vor + ΔU. Closes the clutch after U_tat has been applied to the engine, so the new adapted Holding voltage value as U_ada = U_tat - ΔU assumed and proceed to the scaling routine. closes the clutch is not after the application of U_tat, then U_tat becomes ΔU increased and again checked whether the clutch closes. This happens until the clutch closes or another one Abort criterion, such as exceeding a preset time, given is.

closes the clutch already when applying U_vor to the clutch actuator, U_tat = U_vor - ΔU. Close when mooring from U_tat the clutch no longer, so is the holding voltage value reached and U_ada can be set equal to U_tat.

Close the clutch when applying U_tat, the holding voltage value has not yet been reached and U_tat is reduced by ΔU. Then it is checked again whether it closes clutch.

The scaling procedure, as in 4 is described as follows:
In a first step, the scaling factor S is calculated. This scaling factor is the quotient of U_ada and U_vor. So S = U_ada / U_vor.

In a further step is a holding voltage value U_vor_n for read in a further actuator position n from the predetermined holding voltage field. So with the scaling of the upper holding voltage values an upper one Holding voltage value and when scaling the lower holding voltage value a lower holding voltage value.

Now this holding voltage value U_vor_n with the scaling factor S multiplied and stored the value U_ada_n thus obtained. This is given for all values or support values of the given Holding voltage field performed.

are all values scaled, the values of the holding voltages for non-specified actuator positions by interpolation be calculated. Subsequently, the new holding voltage field stored and can be used for the control.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• DE 10027330 A1 [0003]
• WO 2007/05451 [0004]

Claims (8)

A method of determining a holding voltage of a motor in which a clutch actuator of an automated shift transmission operatively connected to the engine remains motionless, comprising the steps of: (a) obtaining a value ΔU _before a supposed hold voltage for a clutch actuator position from a stored map; (b) determining an actual holding voltage for the clutch actuator position; (c) comparing the actual holding voltage with the value ΔU _before the supposed holding voltage; (d) adjusting presumed holding voltage values from the map for a plurality of clutch actuator positions using the comparison of the actual holding voltage with the value ΔU _before the supposed holding voltage. Method according to the preceding claim, characterized in that at least one upper 14 and a lower holding voltage U _{dn is determined} for a clutch _{actuator position} . Method according to the preceding claims, characterized in that from the comparison between the predetermined and the determined holding voltage scaling factors are calculated. Method according to the preceding claim, characterized characterized in that the predetermined holding voltage values for a plurality of clutch actuator positions with the scaling factors be multiplied. Method according to the preceding claims, characterized in that from the actual or newly calculated holding voltages a new map is determined. Method according to one of the preceding claims, characterized in that the determination of the actual holding voltage for the clutch actuator position comprises: (a) increasing or decreasing the holding voltage by an increment ΔU starting from the predetermined holding voltage ΔU _before to ΔU _akt = ΔU _before ± ΔU and ( b) detecting whether the clutch actuator moves at the changed holding voltage .DELTA.U _akt . Method according to the preceding claim, characterized in that the steps (a) and (b) are repeated until the clutch actuator moves, wherein at the location of ΔU _before ΔU _akt occurs. Method according to the preceding claims, characterized in that only either the upper or the lower Holding voltage for a clutch actuator position determined is and both the upper and the lower predetermined holding voltages for a plurality of clutch actuator positions according to Comparison between the determined upper and lower holding voltage and the corresponding predetermined holding voltage is adjusted.