Airbag Control Unit Segmentation for Wiring Reduction
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Solution Overview
Problem
Current airbag control systems require complex wiring and larger processor units to evaluate sensor signals for passenger protection activation, leading to increased space and cost requirements, as well as potential errors in triggering mechanisms.
Innovation Solution
A method involving a control unit that reads and evaluates a single control signal for passenger protection activation, using a PSI5 interface to transmit and decode the signal, allowing for compact units with reduced wiring and simplified processing, and employing dual sequences for robust triggering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex wiring and larger processor units are used to evaluate sensor signals for passenger protection activation, then reliability of activation is improved, but device complexity and space requirements increase
Solution Approach 1:
The system is divided into two functional segments: a central control unit that performs sensor signal evaluation and generates control signals, and a separate triggering unit near the passenger protection means that executes activation. This segmentation allows the complex processing to be centralized while the activation mechanism remains simple and localized, reducing wiring complexity between sensors and actuators.
Solution Approach 2:
A control signal acts as an intermediary between the central control unit and the triggering unit. The control signal encapsulates the activation command generated from sensor evaluation, transmitting the necessary information through a single line without requiring direct complex wiring between all components, thus simplifying the overall system architecture.
2Reliability
If complex wiring and larger processor units are used to evaluate sensor signals for passenger protection activation, then reliability of activation is improved, but installation space requirements increase
Solution Approach 1:
By segmenting the system into a central control unit and a compact triggering unit, the space-consuming processing components are centralized in one location, while the triggering unit near the passenger protection means can be made very compact, reducing the overall installation space requirement distributed throughout the vehicle.
Solution Approach 2:
The complex sensor signal evaluation function is extracted from the triggering unit and placed in the central control unit. This extraction allows the triggering unit to be minimized in size, as it only needs to receive and execute activation commands, not perform complex processing, thereby reducing installation space.
3Reliability
If multiple lines are used for transmitting release signal and activating signal, then reliability of activation is improved, but device complexity and wiring requirements increase
Solution Approach 1:
The release signal and activation command are merged into a single control signal transmitted through one line from the central control unit to the triggering unit. This merging reduces the quantity of cable wires required compared to separate transmission lines, while the control signal still carries sufficient information for reliable activation.
Solution Approach 2:
The single control signal line serves multiple functions: it transmits the release command, carries activation information, and enables the triggering unit to execute the activation sequence. This multi-functionality reduces the need for separate dedicated lines for each signal type, minimizing wiring quantity.
Data Source
AI summary
A method for triggering at least one passenger protection means. The method includes a step of reading in a control signal which contains a command for carrying out an activation of the passenger protection means. Furthermore, method includes a step of releasing an activation of the passenger protection means as a response to the read-in control signal. Furthermore, the method includes a step of evaluating the control signal for the identification of the command for carrying out the activation of the passenger protection means and activating the passenger protection means as a response to an identified command for carrying out the activation of the passenger protection means to trigger the passenger protection means.