DSI Sensor Bus Master Sequential Command Transmission
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Solution Overview
Problem
Current sensor arrangements in motor vehicles using the DSI protocol face challenges in maintaining a high payload data rate, which is essential for reliable operation of advanced functions like artificial neural networks, particularly in ensuring the required ASIL levels for safety-critical systems.
Innovation Solution
A method is introduced where the central processing unit sends messages to sensor units without waiting for response messages, allowing for a configurable mode that bypasses the traditional Command and Response mode, enabling rapid sequential communication and reducing power consumption by eliminating the need for response messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central processing unit waits for response messages from sensor units in traditional Command and Response mode, then communication reliability is improved, but communication speed and data transmission rate deteriorate
Solution Approach 1:
The patent extracts the response message requirement from the communication protocol, allowing the master to send commands without waiting for or receiving response messages. This removes the bidirectional acknowledgment step that limits transmission speed while maintaining sufficient reliability for the application.
Solution Approach 2:
Instead of the traditional master-waits-for-response sequence, the patent inverts the communication flow by allowing the master to continuously send commands without being blocked by response reception, effectively reversing the waiting behavior that constrains productivity.
2Reliability
If response messages are transmitted in every command cycle, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The patent removes the response message transmission from the communication cycle, eliminating the energy-consuming bidirectional exchange while retaining unidirectional command transmission that is sufficient for the sensor application.
Solution Approach 2:
The sensor units operate autonomously based on received commands without needing to generate response messages, reducing the energy expenditure associated with response message preparation and transmission while maintaining functional reliability.
3Reliability
If traditional DSI protocol communication is used with response messages, then system reliability is improved, but system readiness time deteriorates
Solution Approach 1:
The patent extracts the response message requirement from the initialization and operation sequences, allowing the system to become operational faster by eliminating the time-consuming acknowledgment exchanges while maintaining sufficient reliability for the application.
Data Source
AI summary
The invention relates to a method for operating a sensor arrangement (2) in a motor vehicle (1) based on a DSI protocol, whereinthe sensor arrangement (2) has a central processing unit (3) as a master and a plurality of sensor units (S1, S2, S3) as slaves controlled by the master,the central processing unit (3) and the sensor units (S1, S2, S3) are connected to a bus line (4) andcommunication between the central processing unit (3) and the sensor units (S1, S2, S3) takes place via the bus line (4),characterized by the following method steps:sending a first message from the central processing unit (3) to a first sensor (S1) and subsequentlysending a second message from the central processing unit (3) to a second sensor (S2) without the central processing unit (3) waiting to receive a response message from the first sensor (S1). In this way, such a method for operating a sensor arrangement (2) in a motor vehicle (1) is provided in which communication between the master and the slaves is regularly possible at a high payload data rate while at the same time ensuring a predetermined ASIL level.