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Eliminating Address Strapping Harness on J1939 Network with smart addressing

IP.com Disclosure Number: IPCOM000234143D
Publication Date: 2014-Jan-14
Document File: 4 page(s) / 79K

Publishing Venue

The IP.com Prior Art Database

Abstract

This technical disclosure relates to a scheme which utilizes existing J1939 CAN communication network and a display to identify the location of the controller on the vehicle to decide its communication address. Different ECUs on the vehicle communication network have an ECU address and name as their identity on the network. Multiple instances of the same controllers, having different operating modes based on their position on the vehicle, when connected over J1939 network need to have unique communication address. This invention disclosure proposes a new way of determining address in such scenario without additional harness. The proposed solution utilizes available CAN network and display to program addresses of all controllers during vehicle manufacturing and stored in a non-volatile memory for future reference.

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Title: Eliminating Address Strapping Harness on J1939 Network with smart addressing

Abstract:

This technical disclosure relates to a scheme which utilizes existing J1939 CAN communication network and a display to identify the location of the controller on the vehicle to decide its communication address. Different ECUs on the vehicle communication network have an ECU address and name as their identity on the network. Multiple instances of the same controllers, having different operating modes based on their position on the vehicle, when connected over J1939 network need to have unique communication address. This invention disclosure proposes a new way of determining address in such scenario without additional harness. The proposed solution utilizes available CAN network and display to program addresses of all controllers during vehicle manufacturing and stored in a non-volatile memory for future reference.

Drawing:

Figure 1:

Figure 2:

Description:

Traditionally the ECU address is either factory programmed or ECU has a capability to claim the unique address while on the network, so it is difficult to identify what function an ECU does based on its address.  Separate harness can be used to identify the controller address. This traditional way of address strapping harness adds cost and complexity.

The present disclosure explains a schema which utilizes existing J1939 CAN communication network and display to identify the location of the controller on the vehicle to decide its communication address. All the controllers need to be arbitrary address capable. Alternatively a laptop computer can also be employed in case of un-availability of display since this operation has to be performed only at factory or service station during replacement of the controller. This mode can be password protected for the technician.

Figure 1 & 2 describe the sequence of operations, which is explained below

1. All the controllers have a default address as 'X' (Consider any number here)

2. All the controllers claim arbitrary address based on internal algorithm and ...