Vehicles incorporating tailgate energy management systems

• US 8,764,090 B2
• Filed: 11/02/2012
• Issued: 07/01/2014
• Est. Priority Date: 08/11/2011
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Kerr, Norman C.
• Primary Examiner(s): Dayoan, Glenn
• Assistant Examiner(s): BLANKENSHIP, GREGORY A
• Application Number:
  US13/667,134
• Publication Number:
  US 20130060403A1
• Time in Patent Office: 606 Days
• Field of Search: 296 50- 62, 296/146.8, 296/146.4
• US Class Current: 296/50
• CPC Class Codes: E05F 15/627 operated by flexible elongated pulling elements, e.g. belts, chains or cables using flexible elongated push-pull mechanisms E05F15/619
• CPC Class Codes: E05Y 2400/36 Speed control, detection or monitoring
• CPC Class Codes: E05Y 2900/544 Tailboards or sideboards

Abstract

A vehicle includes sidewalls, a tailgate located proximate to rear ends of the sidewalls, and a tailgate energy management system. The tailgate energy management system includes a governor coupled to one of the sidewalls and to the tailgate. The governor selectively applies a governing force to the tailgate to reduce an opening speed of the tailgate. The tailgate energy management system also includes a speed sensor sensing an opening speed of the tailgate and an electronic control unit electronically coupled to the governor and the speed sensor. The electronic control unit includes a processor and memory storing an instruction set. The electronic control unit receives a speed signal indicative of the opening speed of the tailgate and the processor executes the instruction set to cause the electronic control unit to transmit a control signal to the governor to slow the opening speed of the tailgate based on the speed signal.

Claims

1. A method of managing remote actuation of a vehicle tailgate comprising:

receiving a command to open the tailgate;

transmitting an unlatch signal to at least one tailgate latch actuator to unlatch a tailgate latch from a corresponding tailgate latch striker;

applying an unlatch force to the tailgate latch that is smaller than a predetermined maximum unlatch force; and

terminating the unlatch signal to the at least one tailgate latch actuator if an external load applied to the tailgate is greater than a predetermined maximum external load.

2. The method of managing remote actuation of the vehicle tailgate of claim 1, wherein the at least one tailgate latch actuator applies an unlatch force to the tailgate latch.

3. The method of managing remote actuation of the vehicle tailgate of claim 2, wherein the unlatch force applied by the at least one tailgate latch actuator to the tailgate latch is greater than an internal resistance of the tailgate latch when the external load applied to the tailgate is smaller than the predetermined maximum external load.

4. The method of managing remote actuation of the vehicle tailgate of claim 1, wherein the external load applied to the tailgate increases an internal resistance of the tailgate latch.

5. The method of managing remote actuation of the vehicle tailgate of claim 4, wherein the unlatch force applied by the at least one tailgate latch actuator to the latch is greater than the internal resistance of the tailgate latch when the external load applied to the tailgate is less than the predetermined maximum external load.

6. The method of managing remote actuation of the vehicle tailgate of claim 5, wherein the unlatch force applied by the at least one tailgate latch actuator is less than the internal resistance of the tailgate latch when the external load applied to the tailgate is greater than the maximum external load.

7. A vehicle comprising:

a tailgate latch coupled to one of a vehicle tailgate or sidewalls of a vehicle;

a tailgate latch striker coupled to one of the vehicle tailgate or sidewalls of the vehicle, the tailgate latch and the tailgate latch striker positioned to selectively latch with one another;

a tailgate latch actuator coupled to the tailgate latch that selectively applies an unlatch force to the tailgate latch, the unlatch force being smaller than a predetermined maximum latch force that corresponds to a predetermined maximum external load applied to the tailgate, wherein if an external load applied to the tailgate is greater than the predetermined maximum external load, the tailgate latch remains latched to the tailgate latch striker; and

a command device communicatively coupled to the tailgate latch actuator, the command device configured to provide an unlatch signal to the tailgate latch actuator.

8. The vehicle of claim 7, further comprising an electronic control unit communicatively coupled to the tailgate latch actuator, the electronic control unit comprising a processor and a memory storing a computer readable instruction set that, when executed by the processor, receives the unlatch signal from the command device and transmits a signal to the tailgate latch actuator to apply the unlatch force to the tailgate latch.

9. The vehicle of claim 8 further comprising a governor coupled to one of the sidewalls and to the tailgate, the governor selectively applying a governing force to the tailgate to reduce an opening speed of the tailgate.

10. The vehicle of claim 9 further comprising a speed sensor communicatively coupled to the electronic control unit sensing the opening speed of the tailgate, wherein the electronic control unit receives a speed signal indicative of the opening speed of the tailgate from the speed sensor and the processor executes the instruction set to cause the electronic control unit to transmit a control signal to the governor such that the governor slows the opening speed of the tailgate based on the speed signal.

11. The vehicle of claim 7, wherein the command device comprises a wireless receiver communicatively coupled to the electronic control unit, the wireless receiver receives a wireless command signal to open the tailgate, the wireless receiver relays the wireless command signal to the tailgate latch actuator to command the tailgate latch actuator to apply the unlatch force to the tailgate latch.

12. A method of managing remote actuation of a vehicle tailgate comprising:

receiving a command to open the tailgate;

transmitting an unlatch signal to at least one tailgate latch actuator to unlatch a tailgate latch from a corresponding tailgate latch striker; and

applying an unlatch force to the tailgate latch that is smaller than a predetermined maximum unlatch force that corresponds to a maximum external load applied to the tailgate, wherein when an external load applied to the tailgate exceeds the maximum external load the tailgate latch remains latched to the striker.

13. The method of managing remote actuation of the vehicle tailgate of claim 12, further comprising terminating the unlatch signal to the at least one tailgate latch actuator if the external load applied to the tailgate is greater than the maximum external load.

14. The method of managing remote actuation of the vehicle of claim 12, wherein the external load applied to the tailgate latch increases an internal resistance of the tailgate latch.

15. The method of managing remote actuation of the vehicle of claim 14, wherein the unlatch force applied by the at least one tailgate latch actuator to the tailgate latch is greater than the internal resistance of the tailgate latch when the external load applied to the tailgate is less than the maximum external load.

16. The method of managing remote actuation of the vehicle of claim 15, wherein the unlatch force applied by the at least one tailgate latch actuator is less that the internal resistance of the tailgate latch when the external load applied to the tailgate is greater than the maximum external load.