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Instrument Cluster Update Mechanism

IP.com Disclosure Number: IPCOM000234843D
Publication Date: 2014-Feb-10
Document File: 2 page(s) / 176K

Publishing Venue

The IP.com Prior Art Database

Abstract

The appearance of displays in the cars’ instrument clusters lead to the situation that the software of the instrument cluster became very complex and large. Updating this software over the standard CAN bus requires an inacceptable long time, therefore additional interfaces are required just for the update process. This paper describes a methodology to perform the software update without additional high-speed interface.

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Title: Instrument Cluster Update Mechanism

Abstract

The appearance of displays in the cars’ instrument clusters lead to the situation that the software of the instrument cluster became very complex and large. Updating this software over the standard CAN bus requires an inacceptable long time, therefore additional interfaces are required just for the update process. This paper describes a methodology to perform the software update without additional high-speed interface.

Article

One solution to provide a fast update mechanism for an instrument cluster in a car without the need for an additional high speed interface is to use the often existing video connection. As illustrated in Figure 1: Software Update Data Flow there is often a video connection like e.g. a LVDS link to transfer video content from the head-unit to the instrument cluster.

Figure 1: Software Update Data Flow

During normal operation this video link is e.g. used to transfer images from the navigation system to the instrument cluster display. Usually the head-unit is connected via a high speed connection to the car network, a key pre-requisite to allow updating the software of the head-unit.

When applying software updates to the instrument cluster one solution is to not directly transfer the new software image via the slow car network (CAN) to the instrument cluster but to transfer it first to the head-unit via the existing high speed connection. The head-unit then uses the video link to transfer the software...