Vehicle Torque Command Rate Control for NVH and Reactivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current vehicle driving force control systems face challenges in rapidly changing driving force, leading to issues like blowing problems, reduced driving feeling, slow reactivity, and conflicts between noise reduction and vehicle acceleration, which require excessive development hours and increased complexity, especially in electrification vehicles.
Innovation Solution
A vehicle driving force control method that collects and analyzes driving information to estimate speed differences, limits torque command variations based on these differences, and adjusts the torque command to optimize driving force delivery, reducing development time and enhancing control unit efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving force is set to change rapidly, then vehicle acceleration reactivity is improved, but noise, vibration, and harshness increase due to twisting of driving shaft or gear backlash
Solution Approach 1:
The patent applies dynamics by making the torque command rate limit value changeable based on driving conditions. The control unit adjusts the rate limit dynamically according to vehicle speed, acceleration requests, and other operational parameters, allowing the system to optimize between rapid response and vibration reduction in different driving scenarios
Solution Approach 2:
The patent changes parameters by adjusting the torque command rate limit value based on multiple factors including vehicle speed, acceleration requests, and current torque commands. This parameter adaptation allows the system to balance between fast response and minimizing mechanical stress on the driving system
2Object-generated harmful factors
If the variation of driving force is excessively limited, then noise, vibration, and harshness are reduced, but vehicle acceleration reactivity deteriorates
Solution Approach 1:
The system dynamically adjusts the torque command rate limit based on real-time driving conditions. When rapid acceleration is requested or vehicle speed is low, the rate limit is increased to improve responsiveness. When vehicle speed is high or driving conditions are stable, the rate limit is reduced to minimize vibrations
Solution Approach 2:
The control unit calculates and prepares appropriate torque command rate limits in advance based on predicted driving conditions and vehicle state, enabling the system to respond proactively to acceleration requests while preventing excessive torque changes before they occur
3Adaptability or versatility
If dualized or diversified driving force command methods are used for different driving modes, then customized control based on driver tendency is improved, but development man hour increases abruptly
Solution Approach 1:
The patent implements a universal torque command rate determination method that works across all driving modes and conditions. Instead of developing separate control algorithms for different driving modes, the system uses a single unified approach that adapts to various conditions through parameter adjustments, significantly reducing development complexity
Solution Approach 2:
The system achieves customized control for different driving modes by changing parameters (torque command rate limits) rather than changing the fundamental control algorithm. This allows the same control structure to adapt to different driving conditions, vehicle types, and driver preferences without requiring separate development efforts
Data Source
AI summary
A vehicle driving force control method is provided. The vehicle driving force control method includes collecting vehicle driving information, estimating speed of a driving system of a vehicle from the collected vehicle driving information and calculating speed difference between measurement speed of the driving system and the estimated speed of the driving system, obtaining torque command rate information from the calculated speed difference, limiting a variation of reference torque command determined according to the vehicle driving information based on the acquired torque command rate information to determine final torque command, and controlling operation of a vehicle driving device according to the final torque command.