CAN Transceiver Modulating Three Symbols via Voltage Levels
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Solution Overview
Problem
Current CAN-bus systems are limited by their modulation format, which restricts bandwidth efficiency and data rate, necessitating advanced modulation techniques that require new arbitration concepts and redesign of standardized CAN models.
Innovation Solution
The proposed CAN-transceiver introduces a third voltage difference in addition to the traditional two, allowing for the transmission of three symbols, thereby increasing data transmission rates without compromising safety or reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If advanced modulation techniques such as QPSK and n-QAM are used, then bandwidth efficiency and data rate are significantly increased, but a new concept for node arbitration and redesign of standardized CAN models are required
Solution Approach 1:
The patent changes the voltage level parameters from two levels (dominant/recessive) to three levels, enabling three-symbol modulation. This parameter change allows the system to achieve higher data rates (1.5 times higher) while maintaining compatibility with existing CAN arbitration mechanisms, avoiding the need for completely new arbitration concepts required by QPSK and n-QAM techniques
2Productivity
If advanced modulation techniques such as QPSK and n-QAM are used, then bandwidth efficiency is significantly increased, but redesign of standardized CAN models is required
Solution Approach 1:
The invention modifies the voltage parameter set from two to three distinct levels, enabling three-symbol modulation that achieves 50% higher bandwidth efficiency. This approach maintains compatibility with standardized CAN models by building upon existing two-level modulation foundations rather than requiring complete redesign
Solution Approach 2:
The patent implements a partial advancement from two-level to three-level modulation, achieving excessive bandwidth efficiency (1.5 times higher) compared to conventional systems while avoiding the excessive complexity of full QPSK or n-QAM implementations. This partial action principle allows incremental improvement without complete system redesign
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables a data transmission rate 1.5 times higher than conventional systems, while maintaining safety and reliability, by effectively utilizing three voltage differences to modulate symbols on the CAN-bus.
Implementation Method 1
a first supply-current connection for providing a first electrical potential; a second supply-current connection for providing a second electrical potential; an H-line connection to an H-line of the CAN-bus; an L-line connection to an L-line of the CAN-bus; at least two switches configured to connect the supply-current connections to the line connections
Data Source
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AI summary
The invention relates to a CAN-transceiver for a CAN-bus-node of a CAN-bus, wherein the CAN-transceiver comprises at least the following components: - a first supply-current connection for providing a first electrical potential; - a second supply-current connection for providing a second electrical potential; - an H-line connection to an H-line of the CAN-bus; - an L-line connection to an L-line of the CAN-bus; - at least two switches configured to connect the supply-current connections to the line-connections; and - a switch control unit for opening and closing the switches. The CAN-transceiver is characterized in particular by the fact that, by means of the at least two switches, the first supply-current connection is connectable both to the H-line connection and to the L-line connection, and the second supply-current connection is connectable both to the H-line connection and to the L-line connection. A CAN-transceiver is proposed, which is configured to modulate three symbols on two lines of a CAN-bus.