Single-Wire ECU Data Transmission With PWM Error Detection
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Solution Overview
Problem
Existing data transmission methods in motor vehicle systems using a single serial interface are prone to interference and lack functional expansion for diverse applications.
Innovation Solution
A method utilizing pulse-width modulated signals with defined period durations for data transmission between control units, allowing for error detection and adaptive operation modes through synchronized pulse-pause sequences, enabling efficient data bus reuse and reduced susceptibility to interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single serial interface is used for data transmission, then device complexity is reduced, but reliability deteriorates due to susceptibility to interference
Solution Approach 1:
The data transmission protocol is segmented into distinct functional parts: control signals, data fields, and error monitoring signals. Each part operates with specific timing characteristics, allowing the receiver to differentiate between control functions and data transmission, thereby maintaining reliability on a single interface.
Solution Approach 2:
The system employs periodic pulse-width modulated signals with defined period durations for error monitoring, alternating with data transmission periods. This periodic structure enables the receiver to distinguish between error check signals and data signals, improving reliability without requiring additional interfaces.
2Reliability
If pulse-width modulated signals with defined period durations are used for error monitoring, then reliability is improved, but device complexity increases
Solution Approach 1:
The error monitoring mechanism uses the existing PWM signal infrastructure to perform self-diagnosis. The receiver monitors the period duration of incoming PWM signals and automatically detects errors without requiring separate error monitoring hardware or complex external verification systems.
Solution Approach 2:
Error detection is achieved by monitoring changes in the period duration parameter of PWM signals. When the period duration deviates from expected values, the system identifies an error condition. This parameter-based approach enables reliable error detection using existing signal characteristics without adding complex monitoring equipment.
3Adaptability or versatility
If data bus connections are used for both control and diagnostic purposes, then adaptability is improved, but reliability deteriorates due to potential signal interference
Solution Approach 1:
The system alternates between control signal transmission and diagnostic signal transmission in periodic intervals. Control functions use PWM signals with specific period durations, while diagnostic functions use the same interface with different period characteristics, enabling multipurpose usage without continuous interference.
Solution Approach 2:
The PWM signal protocol acts as an intermediary that carries both control and diagnostic information through the same physical interface. By encoding different function types within the signal structure itself (through period duration variations), the system enables multifunctional communication while maintaining signal integrity.
Data Source
AI summary
In a method for transmitting data using a predetermined data protocol between a first electronic control unit and a second electronic control unit in a motor vehicle, in which a data protocol is transmitted in the form of a pulse-pause sequence via a single electrical line, a first data protocol may be output by the first control unit on the line and synchronously a second data protocol may be output by the second control unit on the line, after which at least one of the control units acquires the resulting signal of the data protocols on the line and checks it for predefined criteria.