Parking lock actuation system with electromechanical locking function, drive device, and actuation method

Patent metadata

Field	Value
Publication number	US-2023243421-A1
Application number	US-202118003293-A
Country	US
Kind code	A1
Filing date	Jun 8, 2021
Priority date	Jun 29, 2020
Publication date	Aug 3, 2023
Grant date	—

Abstract

A parking lock actuation system for a motor vehicle includes an actuation element that can be moved between a locking position, in which a parking lock of the motor vehicle is active, and an unlocking position, in which the parking lock is inactive. The system also includes a locking element which is designed to fix the actuation element in the unlocking position in a form-fitting manner; and an electric actuator which has an adjusting effect on the locking element. A current circuit which has an autonomous power source is connected to the electric actuator, and a bistable switch and a monostable opener arranged in series to the bistable switch are used in the current circuit.

First claim

What is claimed is:

1 : A parking lock actuation system for a motor vehicle, the parking lock actuation system comprising:
an actuation element movable between a locking position, in which a parking lock of the motor vehicle is active, and an unlocking position, in which the parking lock is inactive; a locking element configured to fix the actuation element in the unlocking position in a form-fitting manner, an electric actuator which has an adjusting effect on the locking element; and a current circuit having an autonomous power source, the current circuit being connected to the electric actuator, a bistable switch and a monostable opener arranged in series with the bistable switch being used in the current circuit.

2 : The parking lock actuation system according to claim 1 , wherein the current circuit is equipped with a connecting element for connection to an external power source.

3 : The parking lock actuation system according to claim 1 , wherein the locking element is provided with a mechanical button for manual actuation.

4 : The parking lock actuation system according to claim 1 , wherein the monostable opener is configured in such a way that the monostable opener is closed in a spring-supported basic position of the monostable opener.

5 : The parking lock actuation system according to claim 1 , wherein the locking element is spring-loaded in such a way that when the actuation element is actuated, the locking element automatically locks the actuation element in an open position of the parking lock or the locking element is pressed against the actuation element in a basic position of the parking lock actuation system.

6 : A drive device for a motor vehicle comprising the parking lock actuation system according to claim 1 and a system which coupleable or connected to a vehicle electrical system power supply for independently actuating the bistable switch and a control unit connected to the monostable opener.

7 : The drive device according to claim 6 , wherein a first sub-circuit of the control unit controlling the monostable opener implements a direct coupling of a vehicle electrical system power source to the monostable opener or an indirect coupling of the vehicle electrical system power source via a control unit and/or a monostable closer with the monostable opener.

8 : The drive device according to claim 6 , wherein a second sub-circuit of the control unit is also connected directly to the electric actuator.

9 : A method for actuating the parking lock actuation system according to claim 1 , wherein in a first operating state the bistable switch is closed and the monostable opener is open, so that the current circuit is interrupted and the locking element is engaged in a form-fitting manner with the actuation element, wherein the actuation element is fixed in the unlocking position, and in a second operating state in which a voltage of a vehicle electrical system couple to the monostable opener has fallen to zero or below a specific limit, the monostable opener closes automatically, so that the current circuit is closed and the electric actuator is driven by breaking a form fit between the locking element and the actuation element, so that the actuation element is automatically moved into the locking position.

10 : The method according to claim 9 , wherein a switch is made from the first operating state to a transport state by opening the bistable switch.

11 : A parking lock actuation system for a motor vehicle, the parking lock actuation system comprising:
an actuation element movable between a locking position, in which a parking lock of the motor vehicle is active, and an unlocking position, in which the parking lock is inactive; a locking element configured to engage the actuation element in a form-fitting manner to fix the actuation element in the unlocking position; an electric actuator configured for adjusting the locking element; and a current circuit having an autonomous power source, the current circuit being connected to the electric actuator, the current circuit including a bistable switch and a monostable opener arranged in series with the bistable switch, the locking element being engagable in the form-fitting manner with the actuation element when the current circuit is interrupted, the electric actuator configured for breaking a form fit engagement between the locking element and the actuation element when the current circuit is closed.

12 : The parking lock actuation system according to claim 11 , further comprising a biasing spring biasing the locking element into engagement in the form-fitting manner with the actuation element when the current circuit is interrupted.

13 : The parking lock actuation system according to claim 12 , wherein the electric actuator is configured for pressing against the biasing spring when the current circuit is closed.

14 : The parking lock actuation system according to claim 11 , wherein the current circuit is configured such that in a first operating state the bistable switch is closed and the monostable opener is open, so that the current circuit is interrupted and the locking element is engaged in the form-fitting manner with the actuation element, fixing the actuation element in the unlocking position.

15 : The parking lock actuation system according to claim 14 , wherein the current circuit is configured such that in a second operating state in which a voltage of a vehicle electrical system couple to the monostable opener has fallen to zero or below a specific limit, the monostable opener closes automatically, closing the current circuit and driving the electric actuator for breaking a form fit between the locking element and the actuation element, so that the actuation element is automatically moved into the locking position.

16 : The parking lock actuation system according to claim 11 , wherein the monostable opener is biased toward a closed position of the monostable opener, and when driven the monostable opener is forced into an open position of the monostable opener.

17 : The parking lock actuation system according to claim 11 , further comprising a connecting element for connection to an external power source, the electric actuator being actuatable by the connecting element when the connecting element is connected to the external power source.

18 : The parking lock actuation system according to claim 11 , further comprising a mechanical button for manual actuation to directly disengage the locking element.

19 : The parking lock actuation system according to claim 11 , wherein the actuation element is forceable in a first direction by a return spring and in a second direction opposite the first direction by a pressure cylinder.

20 : The parking lock actuation system according to claim 19 , wherein the locking element prevents the actuation element from moving in the first direction and in the second direction when the locking element engages in the form-fitting manner with the actuation element.

Assignees

• Schaeffler Technologies Ag

Inventors

• Greb Peter
• Mühlhausen Jens

Classifications

• F16H63/3433 Primary

  Details of latch mechanisms, e.g. for keeping pawls out of engagement · CPC title

• F16H63/3475

  using solenoids · CPC title

• F16H63/3483

  with hydraulic actuating means · CPC title

• B60R16/03

  for supply of electrical power to vehicle subsystems {or for (circuit arrangements for charging batteries H02J7/00)} · CPC title

• F16H63/3416 Primary

  Parking lock mechanisms or brakes in the transmission · CPC title