Vehicle Control System Dynamic Determination Time Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Even with multiple communication buses, if target data cannot be input to the control device via any bus, the hydraulic pressures in wheel cylinders and braking forces on wheels decrease, requiring a backup process to compensate, which needs to be initiated quickly.
Innovation Solution
A vehicle control system with a control unit that receives target data through two different communication systems, an input monitoring unit to detect non-input states, and a backup process unit that shortens the determination time for initiating the backup when both data inputs stop, ensuring timely restoration of braking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple communication buses are used to input target data to the control device, then the reliability of data input is improved, but the time lag before backup process activation increases
Solution Approach 1:
The monitoring unit continuously monitors the communication buses in advance to detect non-input states before they affect braking operation. By performing preliminary detection of potential failures, the system can activate the backup process earlier, reducing the time lag while maintaining reliable data input through multiple buses
2Speed
If the determination time for non-input state is shortened to early detect data loss, then the speed of backup process activation is improved, but the measurement precision of non-input state detection deteriorates
Solution Approach 1:
The system dynamically adjusts the determination time based on the monitoring results from multiple communication buses. When one bus shows non-input state, the determination time for the other bus is adjusted to balance early detection speed with accurate confirmation, allowing flexible optimization between activation speed and detection precision
3Productivity
If the backup process is activated early to compensate braking force decrease, then the productivity of braking force restoration is improved, but the device complexity increases
Solution Approach 1:
The monitoring unit provides continuous feedback on the input state of target data from multiple communication buses to the control unit. This feedback mechanism enables early activation of the backup process when needed, improving the productivity of braking force restoration while managing system complexity through structured information flow
Data Source
AI summary
This vehicle control system is provided with an input monitoring unit and a determination time changing unit. When a state in which first target data is not input to a second control unit continues for a first determination time or longer, the input monitoring unit determines the first target data to be in a non-input state. When a state in which second target data is not input to the second control unit continues for a second determination time or longer, the input monitoring unit determines the second target data to be in a non-input state. When the first target data is determined to be in a non-input state, the determination time changing unit shortens the second determination time.