Vehicle Behavior Control Device Deceleration Jerk Steering Responsivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle behavior control systems either intervene strongly in driver intent or compromise on responsivity and stability when controlling acceleration or deceleration, and fail to improve vehicle attitude stability and riding comfort effectively.
Innovation Solution
A vehicle behavior control device that generates a deceleration jerk in the longitudinal direction when the steering speed exceeds a threshold, synchronizing it with lateral jerk to enhance responsivity and linear feeling, while reducing driving force to improve vehicle stability and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control gain is increased to improve vehicle behavior control effectiveness, then vehicle stability and responsivity are improved, but driver intervention feeling becomes stronger
Solution Approach 1:
The control system performs preliminary action by generating deceleration jerk at the initial stage of steering operation, before the vehicle enters unstable behavior. This proactive control reduces the need for strong corrective actions later, improving stability while maintaining subtle intervention that drivers don't strongly perceive.
Solution Approach 2:
The control gain is dynamically adjusted based on steering speed and vehicle state. The system applies stronger control when steering speed exceeds threshold (improving stability) while using softer control during normal operation (reducing intervention feeling), making the control characteristics adaptable to different driving conditions.
2Ease of operation
If control gain is reduced to suppress driver intervention feeling, then driver comfort is improved, but vehicle responsivity and stability control effectiveness are reduced
Solution Approach 1:
By acting early in the steering maneuver with deceleration jerk generation, the system prevents unstable behavior before it develops, achieving effective stability control with minimal intervention strength. This eliminates the need for high control gain during normal operation, reducing driver intervention feeling.
3Ease of operation
If deceleration is applied late in steering operation, then vehicle behavior becomes more natural, but responsivity and linear feeling with respect to steering input are reduced
Solution Approach 1:
The system applies deceleration jerk at the very beginning of steering operation (when steering speed first exceeds threshold), rather than waiting for unstable behavior to develop. This timing provides immediate responsivity to steering input while maintaining natural vehicle behavior characteristics.
Solution Approach 2:
The control system dynamically activates deceleration jerk generation based on real-time steering speed detection. When steering speed exceeds the threshold, control is immediately applied for responsive behavior; when below threshold, control is inactive for natural behavior, creating adaptive timing that balances responsivity and naturalness.
Data Source
AI summary
There is provided a vehicle behavior control device capable of improving responsivity of a vehicle behavior and a linear feeling with respect to a steering wheel operation without causing a driver to experience a strong feeling of intervention of the control and, at the same time, capable of controlling behavior of a vehicle in such a manner as to also improve stability of the vehicle attitude and riding comfort. In a vehicle behavior control device applied to a vehicle having steerable front road wheels, the vehicle behavior control device includes a PCM which acquires a steering speed of the vehicle, and generates a deceleration jerk which is a rearward jerk in a longitudinal direction of the vehicle when the steering speed becomes equal to or greater than a given threshold TS1 which is greater than zero.