Dual Power Vehicle Control for Autonomous Stop
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Solution Overview
Problem
In autonomous vehicle systems, there is a risk that the vehicle may not be able to stop properly if the primary power source for the vehicle management ECU fails, as the autonomous driving ECU relies on direct control from the engine ECU, which can lead to unreliable operation.
Innovation Solution
A vehicle system is configured with two independent power sources and platforms, where the autonomous driving platform can transmit control instructions to either the first or second vehicle platform depending on its operational state, ensuring the vehicle can be safely stopped even if the primary power source fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the autonomous driving ECU directly controls traveling of the vehicle, then the autonomous driving function can be added without great change to existing vehicle platform, but the security and reliability of the vehicle system deteriorates
Solution Approach 1:
The patent introduces an intermediary ECU (engine ECU or traveling control ECU) that acts as a mediator between the autonomous driving ECU and the vehicle's traveling control systems. The autonomous driving ECU issues commands to this intermediary ECU, which then executes the actual control actions. This intermediary layer maintains security by preventing direct control while enabling autonomous functionality through indirect control via the vehicle-mounted network.
Data Source
AI summary
A vehicle system includes a first vehicle platform including a first computer configured to operate by means of electric power from a first electric power source and perform traveling control of a vehicle, a second vehicle platform including a second computer configured to operate by means of electric power from a second electric power source different from the first electric power source and perform traveling control of the vehicle, and an autonomous driving platform including a third computer configured to perform autonomous driving control of the vehicle by transmitting a control instruction including data for autonomously driving the vehicle to the first computer when the first vehicle platform is in a normal state and perform autonomous stoppage control of the vehicle by transmitting a control instruction including data for causing the vehicle to autonomously stop to the second computer when the first vehicle platform is in an abnormal state.