Vehicle Control System Dynamic Deceleration Force Distribution
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems rely heavily on brake devices to generate deceleration forces for improved turning performance, leading to frequent wear and temperature issues, and the power plant may struggle to generate deceleration forces depending on vehicle states.
Innovation Solution
A vehicle control system that includes a vehicle state detecting device, pitch moment computation unit, deceleration force computation unit, and deceleration force distribution unit to dynamically compute and distribute deceleration forces between the brake device and power plant, allowing for appropriate selection of the deceleration force generation device based on vehicle state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the brake device is used to generate deceleration force for improving turning performance, then turning performance is improved, but friction materials wear out and temperature increases
Solution Approach 1:
The system dynamically changes the source of deceleration force based on vehicle state parameters. When the power plant can provide deceleration force (based on engine state, speed, load conditions), it is used instead of the brake device. This parameter-based switching reduces brake usage frequency while maintaining turning performance, thereby improving brake durability without sacrificing turning capability.
2Reliability
If the power plant is used to generate deceleration force, then brake device wear is reduced, but the power plant may have difficulty generating deceleration force depending on vehicle state
Solution Approach 1:
The system dynamically selects between power plant and brake device for generating deceleration force based on real-time vehicle state. The selection is not fixed but adapts to changing conditions such as engine operating state, vehicle speed, and load requirements. This dynamic approach ensures the power plant is used when capable (extending brake life) while the brake device is available as a reliable backup when the power plant cannot provide sufficient deceleration force.
Solution Approach 2:
The control system acts as an intermediary that manages the interaction between the power plant and brake device. It evaluates the capabilities of both systems and coordinates their operation, using the power plant as the primary deceleration source when possible and the brake device as the secondary source when needed, thereby optimizing both brake durability and deceleration capability across all vehicle states.
3Adaptability or versatility
If the device generating deceleration force is simply switched from brake device to power plant, then deceleration force can be generated by power plant, but fluctuations in deceleration occur and occupant feels strange
Solution Approach 1:
The control system performs preliminary evaluation of the power plant's capability to generate deceleration force before switching from the brake device. By assessing engine state, speed, and load conditions in advance, the system ensures smooth transitions only when the power plant is ready and capable, preventing abrupt deceleration changes that would be perceived by the occupant. This preliminary check ensures stable and comfortable deceleration switching.
Data Source
AI summary
A vehicle control system includes: a vehicle state detecting device configured to obtain vehicle state information that includes a steering angle of a front wheel; a pitch moment computation unit configured to compute an applied pitch moment to be applied to a vehicle based on the vehicle state information; a deceleration force computation unit configured to compute an applied deceleration force to be generated in the vehicle based on the applied pitch moment; and a deceleration force distribution unit configured to compute a brake device deceleration force to be generated by a brake device and a power plant deceleration force to be generated by a power plant based on the applied deceleration force and state information of the brake device and the power plant.