CAN XL Transmission Module Using Intermediate Bus States
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Solution Overview
Problem
The signaling of state changes in CAN XL bus systems is unpredictable, leading to potential abrupt transitions and emissions that violate emission and bus integrity requirements, necessitating a transmitting/receiving device that can manage transitions smoothly and minimize errors.
Innovation Solution
A transmission module for a transmitting/receiving device that generates bus signals as analog differential signals, using a predetermined sequence of intermediate states to change bus voltage and impedance, ensuring continuous and time-correct transitions without abrupt changes, thereby adhering to CAN XL standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If switching occurs between slow and fast operating modes in CAN XL bus system, then data rate is improved, but abrupt transitions and emissions occur that violate bus integrity requirements
Solution Approach 1:
The patent applies preliminary action by introducing a predetermined sequence of intermediate states that must be traversed before transitioning between operating modes. The transmission module is configured to change bus voltage and impedance through these intermediate states in advance of the final target state, ensuring smooth transitions and preventing abrupt changes that would cause emissions and reflections.
Solution Approach 2:
The patent uses intermediate states as mediators between different operating modes. These intermediate states act as transition steps that bridge the gap between slow and fast modes, allowing the system to switch operating modes without direct abrupt transitions. The intermediate states modify bus voltage and impedance gradually, preventing harmful emissions and reflections while enabling high data rates.
2Adaptability or versatility
If external signaling changes during state transition, then adaptability is improved, but transition predictability deteriorates leading to potential errors
Solution Approach 1:
The patent applies dynamics by making the transmission module's state transition behavior adaptive to external signaling changes. The module dynamically adjusts its operation based on incoming signals, allowing it to respond to changing communication requirements while maintaining reliable transitions through the predetermined sequence of intermediate states.
Solution Approach 2:
The patent uses feedback mechanisms where the transmission module monitors external signaling during state transitions and adjusts its behavior accordingly. This feedback allows the system to maintain reliability by detecting signaling changes and adapting the transition process, ensuring that the predetermined sequence of intermediate states is properly followed even when communication conditions change.
Data Source
AI summary
A transmission module of a transmitting/receiving device for a subscriber station of a serial bus system and a method. The transmission module transmits a digital transmit signal as an analog differential signal on a bus of the bus system to transmit a message to another subscriber station. The transmission module generates the states, specified by the digital transmit signal over the time, on the bus by changing bus voltage and/or bus impedance. The transmission module changes the specified states on the bus via a predetermined sequence of intermediate states for the bus voltage and/or the bus impedance toward the desired state on the bus. The transmission module, when signaling changes during a transition between two specified states on the bus, changes the transition back again continuously with the opposite sequence of intermediate states from the intermediate state reached by then.