Yaw Torque Coordination for Brake and Torque Vectoring Control
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Solution Overview
Problem
Existing vehicle motion control systems often lead to under and over-steering due to inefficient coordination between wheel-individual brake systems and power-train torque vectoring actuators, resulting in inaccurate vehicle response to driver inputs and potential loss of control.
Innovation Solution
A vehicle motion control system that coordinates and synchronizes wheel-individual brake systems and power-train torque vectoring actuators through a central control module, using yaw torque controllers to determine and prioritize actuator usage based on driving situations and intended vehicle attributes, ensuring accurate and agile vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional separate control algorithms are used for ESC and torque vectoring systems, then each system can operate independently, but the systems compete instead of complementing each other, resulting in inefficient control action
Solution Approach 1:
The patent merges the ESC system and torque vectoring actuator system into a unified control architecture with a central control function that coordinates both systems. This integration allows the systems to complement rather than compete, improving overall control efficiency while managing the complexity through centralized arbitration logic.
Solution Approach 2:
The central control function serves multiple purposes: it acts as an arbiter between different control algorithms, determines driving situations, prioritizes actuators, and coordinates their execution. This multi-functional approach consolidates what would otherwise require separate control systems, improving efficiency without proportionally increasing complexity.
2Force
If multiple actuators are used to control yaw torque, then the system can provide more control authority, but coordinating and synchronizing them becomes complex
Solution Approach 1:
The central control function acts as an intermediary between multiple actuators (brake system and torque vectoring actuators). It receives yaw torque requests, determines the appropriate actuator prioritization based on driving situation, and coordinates their execution. This mediator approach simplifies the coordination complexity by providing a single point of decision-making.
Solution Approach 2:
The system dynamically adjusts actuator prioritization based on the determined driving situation. The central control function can switch between different actuator combinations and coordination strategies depending on real-time conditions, allowing flexible adaptation without requiring a fixed complex coordination structure for all scenarios.
3Productivity
If the system prioritizes certain actuators based on driving situation, then the control action becomes more efficient, but the control logic becomes more complex
Solution Approach 1:
The central control function performs preliminary determination of the driving situation and actuator prioritization before executing control actions. By pre-assessing the context and establishing the actuator hierarchy in advance, the system enables faster real-time response without requiring complex decision-making during the actual control execution phase.
Data Source
AI summary
A vehicle motion control system for coordinating and synchronizing a wheel-individual brake system and a power-train torque vectoring actuator system in a vehicle. The wheel-individual brake system includes at least one first actuator for applying a braking torque to individual wheels of the vehicle. The power-train torque vectoring actuator system includes at least one second actuator for applying a torque to individual wheels of the vehicle through a propulsion system. The vehicle motion control system includes a central control function module including a plurality of yaw torque controllers. Each yaw torque controller is configured to receive data including driver inputs and vehicle motion states to determine a respective yaw torque based on the received data for controlling the yaw behavior of the vehicle.