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Quality measure of CAN signals

IP.com Disclosure Number: IPCOM000245867D
Publication Date: 2016-Apr-14
Document File: 2 page(s) / 25K

Publishing Venue

The IP.com Prior Art Database

Abstract

This disclosure describes a solution for an electrical system comprising an ECU communicating with a number of components via a CAN bus. If a sensor in such a system not works properly the ECU normally would emit a signal indicating that the signal from that sensor is wrong which would inhibit all components that need this signal to function. This discloser suggest that the control unit in such cases alternatively emits an estimated value and the faulty value from the sensor. For many components that needs information from the sensor an estimated value can be sufficient for at least some functionality which is better than no functionality at all.

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Abstract

This disclosure describes a solution for an electrical system comprising an ECU communicating with a number of components via a CAN bus. If a sensor in such a system not works properly the ECU normally would emit a signal indicating that the signal from that sensor is wrong which would inhibit all components that need this signal to function. This discloser suggest that the control unit in such cases alternatively emits an estimated value and the faulty value from the sensor. For many components that needs information from the sensor an estimated value can be sufficient for at least some functionality which is better than no functionality at all.

Profylax

An electrical system comprises an electrical control unit ECU that is connected to a CAN bus for receiving and delivering signals to different parts of the electrical system. In vehicles the standard SAE J 1939 is used for communication and diagnostics among vehicle components

One problem can occur when one sensor in the electrical system for some reason not works properly. In such a case the electrical control unit will emit a signal indicating that the signal from that sensor in not correct and should not be used for the control purposes. This will inhibit all components from using the signal from the faulty sensor. For some components this will be detrimental and the function of such component will also fail.

However, some signals can be replaced by a signal representing an estimated value from a sensor, although the signal from the physical sensor is not correct. Such an estimated value ca...