Abstract
In the last decade, modern vehicles have become very complex, being equipped with embedded electronic systems which include more than a thousand of electronic control units (ECUs). Therefore, it is mandatory to analyze the potential risk of automotive systems failure because it could have a significant impact on humans’ safety. This paper proposes a novel, functional safety concept at the power management level of a system basis chip (SBC), from the development phase to system design. In the presented case, the safety-critical application is represented by a powertrain transmission electronic control unit. A step-by-step design guideline procedure is presented, having as a focus the cost, safety, and performance to obtain a robust, cost-efficient, safe, and reliable design. To prove compliance with the ISO 26262 standard, quantitative worst-case evaluations of the hardware have been done. The assessment results qualify the proposed design with automotive safety integrity levels (ASIL, up to ASIL-D). The main contribution of this paper is to demonstrate how to apply the functional safety concept to a real, safety-critical system by following the proposed design methodology.
Highlights
IntroductionIt is well known that automotive integrated circuit packages continue to get smaller, but with more and more integrated functions inside the package
It is well known that automotive integrated circuit packages continue to get smaller, but with more and more integrated functions inside the package. This is available for the power supply module, which represents one of the main circuits from the electronic control unit (ECU)
The ECU cost is significantly reduced by integrating the discrete components
Summary
It is well known that automotive integrated circuit packages continue to get smaller, but with more and more integrated functions inside the package This is available for the power supply module, which represents one of the main circuits from the electronic control unit (ECU). It is necessary to highlight that is the cost targeted, and the safety and security, which represent special requirements in the automotive industry, especially for powertrain applications where the safety SBC architecture shall support independent monitoring of critical safety parameters It is an essential function for the energy and power management of the battery management systems, as well as the steering and transmission control in electric and hybrid vehicle applications.
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