Sinusoidal Synchronization Pulse Generator for Vehicle Control
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Solution Overview
Problem
Current synchronization pulses in vehicle occupant protection systems, particularly in PSI5 interfaces, suffer from inaccuracies in quiescent current acquisition due to independent voltage and current circuits, leading to electromagnetic emissions and voltage offsets, which affect data transfer efficiency.
Innovation Solution
A receiving assemblage for a control device generates a sinusoidal synchronization pulse using a voltage generator, current source, and current sink, with automatic regulation to ensure accurate quiescent current acquisition and minimize electromagnetic emissions by comparing voltage differences at the pulse end, thus maintaining predefined specification limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a trapezoidal synchronization pulse is used to ensure specific shape and time-related behavior, then synchronization accuracy is improved, but electromagnetic emission increases due to large proportion of harmonics
Solution Approach 1:
The patent changes the waveform parameter from trapezoidal to sinusoidal shape. This parameter change fundamentally alters the harmonic content of the signal, reducing electromagnetic emissions while preserving the synchronization function. The sinusoidal waveform naturally contains fewer harmonics compared to the sharp-edged trapezoidal waveform.
2Device complexity
If independent circuits are used for voltage generation and current sensing, then device complexity is reduced, but measurement precision deteriorates due to inaccuracies in quiescent current acquisition
Solution Approach 1:
The patent implements a feedback mechanism where the sensed quiescent current is fed back to the voltage generator. This feedback loop allows the system to automatically adjust and compensate for inaccuracies in quiescent current acquisition, ensuring precise synchronization pulse generation despite using independent circuits for voltage and current sensing.
Data Source
AI summary
A receiving assemblage is provided for a control device in a vehicle, having a voltage generator for generating a synchronization pulse, which encompasses a first voltage source, a current source, and a current sink, the voltage generator generating the synchronization pulse within predefined specification limits with a predefined shape and a predefined time-related behavior, and the receiving assemblage outputting the synchronization pulse via a data bus to at least one sensor for synchronization of a subsequent signal transfer, the voltage generator generating the synchronization pulse via the current source and the current sink, substantially as a sinusoidal oscillation, by charging and/or discharging a bus load, and to a method for generating a synchronization pulse.