Vehicle Remote Control Security Device Segmentation
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Solution Overview
Problem
Conventional radio remote controls for vehicles face complexity and high failure rates when attempting to control functions relevant for operational safety, such as autonomous parking, due to stringent requirements for functional safety, which are difficult to accommodate within the constraints of installation space and power consumption.
Innovation Solution
A radio remote control design that includes a security device with a security input means and circuit, which requires user activation to generate transmission data for safety-critical functions, ensuring that these functions can only be activated when the security input is actuated and deactivated when canceled, thereby preventing undesired activations and reducing the overall complexity and cost of compliance with functional safety standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional safety requirements are applied to the entire remote control system, then operational safety of vehicle functions is improved, but device complexity and failure rates increase significantly
Solution Approach 1:
The patent divides the remote control system into two distinct parts: a security device that generates security information and a transmitter logic controller that uses this information. Only the security device is developed and safeguarded according to functional safety standards (ISO 26262), while the transmitter logic controller follows conventional development processes. This segmentation allows operational safety to be ensured for safety-relevant functions without applying full functional safety requirements to the entire system, thereby reducing overall complexity.
Solution Approach 2:
The patent applies different development and safety standards to different parts of the system based on their functional relevance. The security device, which is critical for operational safety, is developed according to ISO 26262 with appropriate safeguards. The transmitter logic controller, which handles non-critical functions, uses conventional development processes. This localized application of quality standards ensures safety where needed while avoiding unnecessary complexity elsewhere.
2Reliability
If redundant processing is implemented to assure functional safety, then operational safety is improved, but installation space and power consumption limits are exceeded
Solution Approach 1:
The patent segments the safety-critical functionality into a dedicated security device that operates independently from the main transmitter logic controller. The security device generates security information (such as cryptographic keys or authentication data) that is used by the transmitter but does not require the transmitter to implement redundant processing. This segmentation enables functional safety to be achieved with minimal impact on power consumption and installation space.
3Reliability
If the entire transmitter is developed according to ISO 26262, then functional safety is ensured, but software development complexity and failure rates increase
Solution Approach 1:
The patent separates the system into a security device that is developed according to ISO 26262 and a transmitter logic controller that uses conventional software development processes. The security device handles all safety-critical operations (generating and managing security information), while the transmitter logic controller simply uses this information for encryption or authentication. This segmentation dramatically reduces software development complexity and failure rates compared to developing the entire transmitter according to functional safety standards.
Solution Approach 2:
The patent applies functional safety development standards locally to only the security device, which is the minimal necessary component to ensure operational safety. The rest of the system (transmitter logic controller) uses conventional development processes. This localized approach ensures functional safety is achieved with minimal software complexity and development overhead.
Data Source
AI summary
A radio remote control for controlling at least one first vehicle function that is relevant for functional safety, and further vehicle functions not related to functional safety. The remote control generates and wirelessly transmits transmission data to the vehicle for implementing the first vehicle function in response to a user input and a security information, provided upon actuation of a user interface and a security input actuator, respectively, by the user. In the case of a user input that is associated with the first vehicle function, the security information is only used to generate transmission data that causes the first vehicle function to be carried out if the security input actuator was actuated.