Crash management system and method in an electronic latch of a motor-vehicle closure device

• US 10,138,656 B2
• Filed: 12/24/2013
• Issued: 11/27/2018
• Est. Priority Date: 12/24/2012
• Status: Active Grant

• Current Assignee: Magna Closures Company Limited (Magna International Incorporated)
• Original Assignee: Magna Closures Company Limited (Magna International Incorporated)
• Inventors: Dente, Davide, Frello, Antonio
• Primary Examiner(s): Melton, Todd M
• Assistant Examiner(s): Roberson, Jason R
• Application Number:
  US14/653,210
• Publication Number:
  US 20150330111A1
• Time in Patent Office: 1,799 Days
• Field of Search: None
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: E05B 77/12 Automatic locking or unlocking at the moment of collision
• CPC Class Codes: E05B 81/14 operating on bolt detents, e.g. for unlatching the bolt
• CPC Class Codes: E05B 81/86 using capacitors
• CPC Class Codes: H02J 2207/50 Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors using capacitors as storage or buffering device in cooperation with batteries H02J7/345
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02J 9/061 for DC powered loads
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

An electronic latch assembly for a closure device of a motor vehicle, having an actuator group operable for actuation of the closure device and an electric motor controllable to drive the actuator group (6). The electronic latch assembly has a backup energy source, and a control unit controlling the electric motor and the backup energy source to provide a backup supply voltage (V_sc) during an emergency operating condition. The control unit is configured to enter an emergency mode to cause disabling of actuation of the closure device, upon detecting the occurrence of the emergency operating condition, and to maintain disabled the actuation of the closure device, during the emergency operating condition.

Claims

1. An electronic latch assembly for a closure device of a motor vehicle, including an electric motor, a control unit and a backup energy source and coupled to a vehicle main power source and configured to provide a backup supply voltage (V_sc) to the control unit during an emergency operating condition, wherein the emergency operating condition comprises the vehicle main power source not being available,

wherein the control unit is configured to enter an emergency mode to cause disabling of actuation of the closure device, upon detecting the occurrence of the emergency operating condition, and to maintain disabled the actuation of the closure device, during the emergency operating condition;

wherein the backup energy source and the control unit are arranged internally of the electronic latch assembly,

wherein the backup energy source includes a boost module and a supercapacitor group and the boost module is configured to receive at its input the backup supply voltage (V_sc) generated by the supercapacitor group, and is configured to increase the backup supply voltage (V_sc) to drive the electric motor of the latch assembly.

2. The electronic latch assembly according to claim 1, wherein the control unit is configured to autonomously manage the emergency mode during the emergency operating condition, locally to the electronic latch assembly, independently from an external main management unit of the motor vehicle and independently from the availability of a main power source of the motor vehicle.

3. The electronic latch assembly according to claim 1, wherein the electronic latch assembly includes a case, and wherein the backup energy source and the control unit are arranged within the case.

4. The electronic latch assembly according to claim 1, wherein the backup energy source includes a supercapacitor group, configured to store energy during a normal operating condition whereby the electronic latch assembly is designed to be supplied by a main power source of the motor vehicle providing a main supply voltage (V_batt), and configured to provide the backup supply voltage (V_sc) to supply the electronic latch assembly during the emergency operating condition.

5. The electronic latch assembly according to claim 1, wherein the emergency operating condition includes a crash or an accident involving the motor vehicle.

6. The electronic latch assembly according to claim 1, further comprising an actuator group operable to control actuation of the closure device, and an electric motor controllable to drive the actuator group, wherein the control unit, in the emergency mode, is configured to disable either the actuator group from controlling actuation of the closure device or the electric motor from driving the actuator group, or to disable both the actuator group and the electric motor.

7. The electronic latch assembly according to claim 1, wherein the control unit is configured to receive an emergency signal (C_s) from an external main management unit of the motor vehicle on a communication line, the emergency signal (C_s) being indicative of the emergency operating condition, and to enter the emergency mode, upon receipt of the emergency signal (C_s).

8. The electronic latch assembly according to claim 7, wherein the control unit is coupled to an external main management unit of the motor vehicle via a communication line including at least a first and a second signal lines and is configured to detect occurrence of the emergency operating condition, and to enter the emergency mode, upon sensing one of a logical high voltage level and a battery voltage on both the first and the second signal lines, the logical high voltage level being greater than a logical low voltage level set during a normal operating condition.

9. The electronic latch assembly :

according to claim 7, wherein the control unit is configured to exit the emergency mode to cause enabling of actuation of the closure device, upon the first to occur of the following conditions;

the reception of an exit signal indicative of the end of the emergency operating condition from the external main management unit of the motor vehicle on the communication line; and

the expiry of a pre-set time period from the start of the emergency mode.

10. The electronic latch assembly according to claim 1, wherein the control unit is configured to exit the emergency mode to cause enabling of actuation of the closure device upon the expiry of a pre-set time period from the start of the emergency mode.

11. The electronic latch assembly according to claim 1, wherein the control unit is configured to implement a reduced-power operation during the emergency mode in order to save energy of the backup energy source.

12. The electronic latch assembly according to claim 1, wherein the control unit, in the emergency mode, is configured to maintain disabled the actuation of the closure device, independently from user or external intervention on the closure device, or on parts thereof.

13. The electronic latch assembly according to claim 1, wherein the electronic latch assembly includes a case, and wherein the backup energy source and the control unit are arranged within the case, together with an actuation group, the actuation group including a ratchet which is selectively rotatable to engage a striker coupled to the closure device, a pawl selectively engaging the ratchet to prevent it from rotating, and being directly or indirectly driven by an electric motor so as to move between an engaged position and a non -engaged position, wherein the backup energy source is configured to provide the backup supply voltage (V_sc) to the control unit and the electric motor.

14. A motor vehicle, including a closure device and an electronic latch assembly coupled to the closure device, according to claim 1.

20. The electronic latch assembly according according to claim 1, wherein the boost module is configured to boost the backup supply voltage (V_sc) value up to automotive standard voltages ranging between 9 V to 16 V.

21. The electronic latch assembly according to claim 1, wherein the boost module provides at its output a boosted voltage V_boost, as a function of the supercap voltage V_sc.

22. The electronic latch assembly according to claim 1, wherein the boosted voltage V_boost is the output of the backup energy source.

23. The electronic latch assembly according to claim 1, wherein the supercapacitor group comprises a capacitance ranging between 16 Farads to 20 Farads.

24. The electronic latch assembly according to claim 1, wherein the boost module includes a boost voltage converter, having an internal controller and a boost-activation switch element selectively enabled to activate the internal controller to implement the boosting operation, by an external signal indicative of an external operation on the closure device;

wherein the internal controller is configured to maintain the boosting operation, until deactivated by the control unit via a deactivation signal.

25. The electronic latch assembly according to claim 1, wherein the boost module is a pulse width modulation boost converter.

15. A method for controlling an electronic latch assembly for a closure device of motor vehicle and coupled to a vehicle main power source and including an electric motor, and a control unit arranged within the electronic latch assembly, wherein a backup energy source is also arranged to provide a backup supply voltage (V_sc) to the control unit during an emergency operating condition, wherein the emergency operating condition comprises the vehicle main power source not being available, wherein the backup energy source includes a boost module and a supercapacitor group, the boost module configured to receive at its input the backup supply voltage (V_sc) generated by the supercapacitor group, and is configured to increase the backup supply voltage (V_sc) to drive the electric motor of the electronic latch assembly, the steps of the method comprising:

detecting the occurrence an emergency operating condition;

entering an emergency mode to cause disabling of actuation of the closure device, upon detecting the occurrence of emergency operating condition; and

maintaining disabled the actuation of the closure device, during the emergency operating condition.

16. The. method according to claim 15, wherein the steps of entering and maintaining are implemented by the control unit locally to the electronic latch assembly, independently from an external main management unit of the motor vehicle and independently from the availability of a main power source of the motor vehicle.

17. The method according to claim 15, wherein detecting the occurrence of the emergency operating condition includes receiving, at the control unit, an emergency signal (C_s) from an external main management unit of the motor vehicle on a communication line.

18. The method according to claim 17 including exiting the emergency mode to cause enabling of actuation of the closure device, upon the first to occur of the following conditions:

the reception of an exit signal indicative of the end of the emergency operating condition from the external main management unit of the motor vehicle on the communication line; and

the expiry of a pre-set time period from the start of the emergency mode.

19. The method according to claim 15 including exiting the emergency mode to cause enabling of actuation of the closure device upon the expiry of a pre-set time period from the start of the emergency mode.