METHOD FOR CONTROLLING A MOTOR VEHICLE HAVING A PARK LOCK

Abstract

A method for controlling a motor vehicle having at least one park lock. A drive train of the motor vehicle has a drive motor, wheel, and a transmission. An operating element actuates the park lock, which can assume a blocking position, in which the park lock blocks the drive train and/or a part of the drive train, and a release position. After actuation of the operating element, the park lock is switched from the release position into the blocking position (or vice versa). Here, the speed of the motor vehicle is determined. After actuation of the operating element and if the park lock assumes the release position beforehand, it is checked whether the speed is greater than a predefined first threshold value. If this check was successful, a first warning signal is produced; and the switching of the park lock into the blocking position is performed.

Claims

1-10. (canceled)

11. A method of controlling a motor vehicle having at least one park lock, wherein the motor vehicle has a powertrain with at least one drive motor, at least one wheel or multiple wheels, and at least one gearbox, wherein an operating element for actuating the park lock is provided and/or is present and the park lock assumes a blocking position, in which the park lock blocks the powertrain or a part of the powertrain, and a release position in which the park lock releases the powertrain or a part of the powertrain, and wherein, upon an actuation of the operating element, the park lock is switched from the release position to the blocking position or from the blocking position to the release position; the method comprising: determining a speed of the motor vehicle; after an actuation of the operating element and when the park lock assumes the release position beforehand: checking whether the speed of the motor vehicle is greater than a predetermined first threshold value; and if a result of the checking step is positive, generating an first warning signal; and switching the park lock into the blocking position.

12. The method according to claim 11, which comprises triggering with the first warning signal a first indication on a combination instrument of the motor vehicle for a predetermined time period.

13. The method according to claim 11, wherein the first indication contains information relating to an abusive actuation of the park lock in the case of a rolling car and/or information relating to an increased wear on the park lock.

14. The method according to claim 11, wherein if the result of the checking step is positive, incrementing a counting variable; checking whether the counting variable is greater than a predetermined second threshold value; and if the check was successful, generating a second warning signal.

15. The method according to claim 14, which comprises triggering with the second warning signal a second indication on a combination instrument of the motor vehicle for a predetermined time period.

16. The method according to claim 15, wherein the second indication concerns information selected from the group consisting of information relating to reaching a maximum number of abusive actuations of the park lock in a case of a rolling motor vehicle, information relating to a defect or failure of the park lock, information relating to a visit to a workshop, and information relating to a use of a parking brake of the motor vehicle.

17. The method according to claim 11, wherein the gearbox has a drive shaft, an output shaft and/or an intermediate shaft, wherein the drive shaft is coupled to the drive motor and the output shaft is coupled to the wheel, and wherein the park lock is arranged for blocking the drive shaft, the output shaft and/or the intermediate shaft of the gearbox.

18. The method according to claim 11, wherein the park lock is a mechanically actuated park lock.

19. The method according to claim 18, wherein the operating element is functionally operatively coupled to the control device and the control device actuates mechanically actuatable components for switching the park lock.

20. The method according to claim 18, wherein the operating element is directly mechanically connected to a mechanism of the park lock for actuating the park lock.

21. The method according to claim 20, wherein the operating element is mechanically connected for actuating the park lock via a Bowden cable.

Description

[0031] There are now a variety of possibilities for designing and developing the method according to the invention for controlling a motor vehicle having a park lock in an advantageous way. For this purpose, reference may first be made to the claim subordinate to claim 1. A preferred design of the invention can be explained below in more detail on the basis of the drawing and the accompanying description. In the drawing:

[0032] FIG. 1 shows a preferred embodiment of a motor vehicle, in particular a motor vehicle having a park lock;

[0033] FIG. 2 shows a preferred embodiment of a method for controlling the motor vehicle of FIG. 1.

[0034] In FIG. 1, a preferred embodiment of a motor vehicle 10, in particular a motor vehicle 10 having a park lock 133, is represented schematically.

[0035] The motor vehicle 10 has a powertrain 20, wherein the powertrain 20 has at least has a drive motor 11, at least one wheel 12, in particular multiple wheels, and at least one gearbox 13. For actuating the park lock 133, an operating element 14 is provided and/or present, wherein the park lock 133 is switchable into a blocking position or into a release position. In the blocking position of the park lock 133, the powertrain 20 and/or a part of the powertrain 20 or in particular one of the above-mentioned components is accordingly blocked in order to prevent unintentional rolling away of the motor vehicle 10. The design and/or implementation of a corresponding park lock 133, in particular the arrangement of the park lock 133 within the powertrain 20, can therefore be realized in multiple ways. A preferred embodiment of a motor vehicle 10 and/or the arrangement or design of a park lock 133 can be described below:

[0036] The motor vehicle 10 has a drive motor 11, at least one wheel 12, in particular multiple wheels, at least one gearbox 13, an operating element 14, a wheel revolution rate sensor 15, a combination instrument 16 and a control device 17.

[0037] The gearbox 13 has a drive shaft 131, an output shaft 132 and/or an intermediate shaft that is not shown and in particular the park lock 133, in particular for blocking the output shaft 132.

[0038] The drive motor 11 is coupled to the drive shaft 131 and can drive this, and the output shaft 132 is coupled to the at least one wheel 12 and can drive this.

[0039] The park lock 133 can take up a blocking position, in which in particular it blocks the output shaft 132, and a release position in which in particular it releases the output shaft 132. The operating element 14 is coupled to the control device 17 and/or to the park lock 133 and is designed in particular as a selector lever. In particular, the operating element 14 can be manually actuated by the driver of the motor vehicle 10 and/or is functionally operatively connected to the control device 17.

[0040] In particular, the park lock 133 is designed as a mechanically actuatable park lock 133. In this case, the operating element 14 can be in particular directly mechanically operatively connected to the park lock 133, in particular via a Bowden cable, or the park lock 133 can be actuated by the control device 17 (as a mechanically designed park lock 133) by actuators which are appropriately controlled by the control device 17 and which then mechanically actuate the park lock 133.

[0041] The control device 17 is coupled to the park lock 133, the operating element 14, the wheel revolution rate sensor 15 and to the combination instrument 16. The control device 17 is designed in such a way that it can determine the speed of the motor vehicle 10, in particular by means of the wheel revolution rate sensor 15, as well as the position of the park lock 133, and the park lock 133 can switch from the release position to the blocking (and vice versa), depending on the actuation of the operating element 14.

[0042] In FIG. 2 a preferred embodiment of a method for controlling the motor vehicle 10 is schematically presented. This method is carried out by the control device 17, for example.

[0043] In a step 100, the speed of the motor vehicle 10 is determined. For this purpose, the control device 17 assesses the measured values supplied by the revolution rate sensor 15 relating to the revolution rate of the wheel 12 in a known manner.

[0044] In a step 101, a check is carried out as to whether the operating element 14 has been actuated. For this purpose, the control device 17 assesses a state signal supplied by the operating element 14. If this check was successful, it jumps to step 102, otherwise it jumps to step 100.

[0045] In step 102 a check is carried out as to whether the park lock 133 takes up the release position. For this purpose, the control device 17 assesses a position signal supplied by the park lock 133. If this check was successful, it jumps to a step 103, otherwise it jumps to a step 100.

[0046] In step 103, a check is carried out as to whether the speed is greater than a predetermined first threshold value. For this purpose, the control device 17 reads the first threshold value from a memory and compares it with the determined speed. If this test was successful, it jumps to a step 104, otherwise it jumps to a step 100.

[0047] In step 104, a first warning signal is generated and sent to the combination instrument 16, which displays a first indication for a predetermined period containing information relating to the abusive actuation of the park lock 133 in a rolling motor vehicle 10, and information relating to the increased wear of the park lock 133.

[0048] In a step 105, the park lock 133 is switched to the blocking position. For this purpose, in particular, the control device 17 actuates the park lock 133 in such a way that the park lock 133 takes up the blocking position.

[0049] In a step 106, a counting variable is incremented, and a check is carried out as to whether the counting variable is greater than a predetermined second threshold value. For this purpose, the control device 17 reads the second threshold value from the memory and compares it with the counting variable. If this check was successful, it jumps to a step 107, otherwise it jumps to step 100.

[0050] In step 107, a second warning signal is generated and sent to the combination instrument 16, which, for a predetermined period, indicates a second indication containing information relating to reaching a maximum number of abusive actuations of the park lock 133 in the case of a rolling motor vehicle 10 and/or information relating to the failure of the park lock 133 and/or information relating to the visit to a workshop and/or information relating to the use of a motor vehicle 10 parking brake that is not shown.

REFERENCE CHARACTER LIST

[0051] 10 Motor vehicle [0052] 11 Drive motor [0053] 12 Wheel [0054] 13 Gearbox [0055] 131/132/133 Drive shaft/output shaft/park lock [0056] 14 Selector lever, operating element [0057] 15 Wheel revolution rate sensor [0058] 16 Combination instrument [0059] 17 Control device [0060] 20 Powertrain