Differential Wheel Force Steering During Vehicle Power Failure
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Solution Overview
Problem
Existing vehicle systems require larger secondary power sources to support both steering and longitudinal-force application systems when the main power source fails, leading to increased costs and size, as both systems need to be operated by the secondary power source in abnormal conditions.
Innovation Solution
The vehicle system configures the longitudinal-force application system to control differences in longitudinal forces between left and right wheels using the secondary power source, eliminating the need for the steering system to operate, thereby reducing the power consumption and allowing for a smaller secondary power source capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the steering system and longitudinal-force application system are operated by the secondary power source when the main power source fails, then the vehicle maintains full functionality, but the capacity and size of the secondary power source must be increased
Solution Approach 1:
The patent extracts the steering function from the active systems during abnormal conditions. Instead of operating both steering and longitudinal-force systems, only the longitudinal-force application system is activated, with steering being eliminated from the operational requirements. This reduces the power consumption demand on the secondary power source while maintaining essential vehicle control through longitudinal force differential.
2Reliability
If both the steering system and longitudinal-force application system are operated by the secondary power source when the main power source fails, then the vehicle maintains full functionality, but the cost and size of the secondary power source increase
Solution Approach 1:
The steering system is extracted from the operational requirements during abnormal conditions. By eliminating the need to operate the steering system and relying solely on longitudinal-force differential for vehicle turning, the patent reduces the required secondary power source capacity, thereby reducing manufacturing costs and system complexity.
3Reliability
If the secondary power source has larger capacity to support both systems, then full vehicle control is maintained during abnormal conditions, but standby current consumption increases
Solution Approach 1:
The patent applies partial action by operating only the essential longitudinal-force application system during abnormal conditions, rather than maintaining full system operation. This selective activation reduces standby current consumption while still providing sufficient vehicle control through differential braking forces, accepting that steering function is temporarily reduced.
Data Source
AI summary
A vehicle system, including: a steering system; and a longitudinal-force application system including longitudinal-force application actuators configured to apply longitudinal forces respectively to one or more left-side wheels and one or more right-side wheels and a longitudinal-force controller configured to control the longitudinal-force application actuators to control the longitudinal forces applied respectively to the one or more left-side wheels and the one or more right-side wheels, and an onboard power source device including a main power source and a secondary power source. When the main power source fails to supply electric power to the longitudinal-force application system and the steering system, the longitudinal-force controller controls the longitudinal-force application actuators to control a difference between the longitudinal force applied to the one or more left-side wheels and the longitudinal force applied to the one or more right-side wheels, thereby turning the vehicle.