Front-Drive Torque Control for Speed Bump Wheel Slip
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Solution Overview
Problem
Front-drive vehicles experience front-wheel slippage and instability when traversing speed bumps due to rapid rotation speed increases, which conventional ESP systems fail to address effectively during brief travel times.
Innovation Solution
A torque control method that determines a reference rotation speed based on rear-wheel rotation and driving conditions to calculate a ratio with actual rotation speed, reducing output torque when the ratio exceeds a threshold to prevent rapid speed increases and alleviate front-wheel slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If torque is applied to the front wheels during a turn, then understeer is reduced and handling responsiveness is improved, but torque vectoring complexity and control system complexity increase
Solution Approach 1:
The torque control system is segmented into distinct functional modules: a detector that identifies turning conditions, a calculator that determines target torque values, and an actuator that applies torque to individual front wheels. This segmentation allows each component to perform a specific function, simplifying the overall control logic while achieving responsive handling.
Solution Approach 2:
The system uses the vehicle's existing drive motor and wheel structure to generate the torque needed for handling improvement. The drive motor itself provides the torque, eliminating the need for separate torque vectoring actuators on each wheel, thus reducing device complexity while maintaining handling responsiveness.
2Reliability
If torque is applied to correct understeer during a turn, then vehicle stability is improved, but additional energy consumption occurs
Solution Approach 1:
The system converts the natural understeer behavior, which is typically a stability issue, into a beneficial handling characteristic. By detecting understeer conditions and applying corrective torque to the inner front wheel, the system transforms stability-correcting torque application into an energy-efficient operation that leverages the drive motor's existing torque output rather than requiring additional energy input.
3Ease of operation
If torque is applied to the inner front wheel during a turn, then handling balance is improved, but uneven torque distribution increases mechanical stress
Solution Approach 1:
The torque distribution is dynamically adjusted based on real-time driving conditions. The controller calculates the optimal torque value for the inner front wheel based on steering angle, vehicle speed, and detected understeer magnitude, allowing the system to apply torque only when and where needed. This dynamic approach improves handling balance while minimizing mechanical stress by avoiding unnecessary torque application.
Data Source
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AI summary
A front-drive vehicle torque control method and apparatus, and a vehicle. The front-drive vehicle torque control method comprises: in response to a torque adjustment request, on the basis of a rear wheel rotation speed and a reference driving speed, determining a reference rotation speed of a power mechanism; calculating the ratio of the actual rotation speed of the power mechanism to the reference rotation speed; and, when the ratio is greater than or equal to a preset threshold value, reducing the output torque of the power mechanism. The present front-drive vehicle torque control method and apparatus and vehicle can reduce the output torque of the power mechanism to prevent the actual rotation speed of the power mechanism from rapidly increasing, thereby alleviating the degree of front wheel slip.