Vehicle Start-Up Torque Control for Lateral Stability
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Solution Overview
Problem
Existing vehicle stabilization systems, such as traction control systems (ASR) and electronic stability programs (ESP), struggle to maintain stability during vehicle start-up from a standstill, particularly in situations with lateral dynamic instability and low road friction.
Innovation Solution
A method and apparatus that detect the start-up situation, determine the actual and target vehicle behavior regarding lateral dynamics, and adjust the drive torque based on the deviation between actual and target behavior, thereby enhancing lateral guidance force and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traction control system (ASR) reduces drive torque to prevent wheel spin, then wheel spin is reduced, but vehicle acceleration performance deteriorates
Solution Approach 1:
The system dynamically adjusts the drive torque based on real-time detection of start-up situations and lateral dynamic stability. The control approach transitions from static torque reduction to dynamic torque management, where the drive torque is adapted according to the detected deviation from target behavior, enabling optimal balance between stability and acceleration at different moments
Solution Approach 2:
The system implements a feedback mechanism by detecting the actual vehicle behavior regarding lateral dynamics and comparing it with target behavior. Based on the detected deviation, the drive torque is adjusted in a closed-loop control fashion, allowing the system to respond to actual vehicle conditions rather than applying predetermined torque reduction
2Device complexity
If ESP system does not intervene at low speeds, then system complexity is reduced, but lateral dynamic stability deteriorates
Solution Approach 1:
The system performs preliminary detection of start-up situations and potential lateral dynamic instability before critical conditions develop. By detecting the start-up situation and monitoring lateral dynamics in advance, the system can apply preventive torque adjustment before the vehicle becomes unstable, avoiding the need for complex reactive interventions
3Reliability
If drive torque is reduced to counteract lateral dynamic instability, then vehicle stability is improved, but acceleration performance deteriorates
Solution Approach 1:
The system applies dynamic torque adjustment rather than static reduction, adapting the drive torque in real-time based on the detected deviation from target lateral dynamic behavior. This allows maximum torque application when stable and controlled torque reduction only when and where needed for stability
Solution Approach 2:
The system changes the drive torque parameter dynamically based on detected vehicle conditions. Rather than maintaining a fixed reduced torque, the torque parameter is continuously adjusted according to the actual deviation from target behavior, optimizing the balance between stability and acceleration
Data Source
AI summary
A method for stabilizing a vehicle in a start-up situation from a standstill, wherein the vehicle is driven by a driving machine which generates a driving torque on driven wheels during the start-up process, including at least the following: a) the start-up situation of the vehicle is detected and in the case of the detected start-up situation, b) the actual behavior of the vehicle is determined with regard to the lateral dynamics of the vehicle, c) a deviation of the actual behavior of the vehicle from the target behavior of the vehicle is determined with regard to the lateral dynamics of the vehicle, and d) an adjustment of the drive torque is carried out depending on the deviation.