Memory management for fleet operation of PEPS vehicles

Patent metadata

Field	Value
Publication number	US-9728018-B2
Application number	US-201514622382-A
Country	US
Kind code	B2
Filing date	Feb 13, 2015
Priority date	Feb 14, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Methods and apparatus are provided to dynamically configure a passive entry, passive start system to issue passive and active commands upon authentication of a remote keyless fob with a body control module in a given vehicle selected from a fleet of vehicles. In particular, a UID secret key data field is generated in the FOB data store using a fleet secret key data field and a vehicle secret key field retrieved from the BCM data store. A wakeup pattern data field stored in the FOB data store is generated with a fleet wakeup pattern data field and a master wakeup pattern data field retrieved from the BCM data store such that an approach wakeup pattern data field stored in the BCM data field is written to an approach wakeup pattern data field in the FOB data store when the remote fob is authenticated with the body control module.

First claim

What is claimed is:

1. A processor-implemented method for mapping a memory system in a passive entry, passive start system having a body control module including a BCM processor and a BCM data store coupled to the BCM processor and a remote fob having a FOB processor and a FOB data store coupled to the FOB processor, the method comprising:
generating a UID secret key data field in the FOB data store using a fleet secret key data field and a vehicle secret key field retrieved from the BCM data store; and
generating a wakeup pattern data field stored in the FOB data field with a fleet wakeup pattern data field and a master wakeup pattern data field retrieved from the BCM data store such that an approach wakeup pattern data field stored in the BCM data field is written to an approach wakeup pattern data field in the FOB data store when the remote fob is authenticated with the body control module for dynamically configuring a functional transmitter ID in the body control module and the remote fob to enable operation of the passive start, passive entry system.

2. The method of claim 1 further comprising reprogramming a third data region of FOB data store when the remote fob is authenticated with the body control module.

3. The method of claim 1 further comprising placing the FOB data store in a learn mode using a BCM Fleet Enable data field retrieved from the BCM data store for matching the remote fob and the body control module.

4. The method of claim 1 further comprising generating a functional transmitter ID with the remote fob and issuing the functional transmitter ID to the body control module for authenticating the remote fob with the body control module as an authenticated FOB/BCM pair.

5. The method of claim 4 further comprising enabling an active command functionality using a Fleet Active RFA mode data field for the authenticated FOB/BCM pair.

6. The method of claim 1 further comprising encrypting a User Data field in a third data region of BCM data store and sending the encrypted User Data field to the FOB data store.

7. The method of claim 1 further comprising moving or copying an encrypted User Data field in the FOB data store to a Plain Read User Data field in a fourth data region of the FOB data store and configuring the Plain Read User Data field to be read by an external tool.

8. A passive entry, passive start system comprising:
a body control module having a BCM processor and a BCM data store coupled to the BCM processor, the BCM data store having a master secret key data field, a vehicle secret key data field, a fleet secret key data field, an approach wakeup pattern data field, a master wakeup pattern data field, a fleet wakeup pattern data field, a fleet enable data field and a fleet active RFA mode data field;
a remote fob having a FOB processor and a FOB data store coupled to the FOB processor, the FOB data store having:
a first data region including a master secret key data field, an identification number data field and approach wakeup pattern data field;
a second data region including UID secret key data field and wakeup pattern data field; and
a third data region including UID number data field, an encrypted VIN data field, and an encrypted User Data field;

wherein the fleet secret key data field and the vehicle secret key field in the BCM data store are used to generate the UID secret key data field in the FOB data store; and
wherein the fleet wakeup pattern data field and the master wakeup pattern data field in the BCM data store are used to generate the wakeup pattern data field stored in the fob data field such that the approach wakeup pattern data field stored in the BCM data field is written to the approach wakeup pattern data field in the FOB data store when the remote fob is authenticated with the body control module for dynamically configuring a functional transmitter ID in the body control module and the remote fob to enable operation of the passive start, passive entry system.

9. The passive entry, passive start system of claim 8 wherein the third data region of FOB data store is re-programmable when the remote fob is authenticated with the body control module.

10. The passive entry, passive start system of claim 8 further comprising a BCM Fleet Enable data field in the BCM data store for placing the FOB data store in learn mode to match the remote fob and the body control module.

11. The passive entry, passive start system of claim 8 wherein the fob is configured to generate the UID using as the functional transmitter ID for authenticating the body control module as an authenticated FOB/BCM pair.

12. The passive entry, passive start system of claim 11 further comprising a Fleet Active RFA mode data field for enabling an active command functionality for the authenticated FOB/BCM pair.

13. The passive entry, passive start system of claim 8 further comprising an Encrypted User Data field in the FOB data store configured to store encrypted from a User Data field in the third data region in the BCM data store of the body control module.

14. The passive entry, passive start system of claim 13 further comprising a Plain Read User Data field in the fourth data region of the FOB data store, wherein the Encrypted User Data field in the FOB data store is configured to be decrypted and moved or copied to the Plain Read User Data field for retrieval by an external tool.

15. The passive entry, passive start system of claim 8 further comprising wherein the first and second data region of the FOB data store have denied read, ciphered write functionality.

16. The passive entry, passive start system of claim 8 further comprising wherein the third data region has plain read, ciphered write functionality.

17. The passive entry, passive start system of claim 8 further comprising wherein the fourth data region has plain read, denied write functionality.

18. The passive entry, passive start system of claim 8 further comprising a calBOM data store having a Fleet Enable data field and a Fleet Secret key data field, wherein the Feet Secret key data field is written from the Cal BOM data store to the Fleet Secret Key data field in the BCM data store for generating a UID Secret Key data field in FOB data store.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Proefke David T
• Asmar Ron Y
• Utter Thomas E
• Creguer Aaron P

Classifications

• B60R25/24 Primary

  using electronic identifiers containing a code not memorised by the user · CPC title

• H04L2209/80

  Wireless · CPC title

• G07C2009/00365

  in combination with a wake-up circuit · CPC title

• G07C9/00309 Primary

  operated with bidirectional data transmission between data carrier and locks · CPC title

• G07C2009/00412

  the transmitted data signal being encrypted · CPC title