Adaptive Torque Ramp for Vehicle Traction Control
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Solution Overview
Problem
Conventional traction control systems for motor vehicles often brutally correct slip errors, leading to deterioration in driving comfort and safety due to delayed and unresponsive torque correction signals, which are not adapted to the wheel's grip with the ground.
Innovation Solution
A traction control system that determines wheel slip and calculates a torque correction ramp signal based on a reference torque measured before slipping, allowing adaptation of the ramp's slope according to the wheel's grip, using an optimization activation signal and a map to adjust the braking torque correction slope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a ramp correction signal is used to gradually transmit corrected torque to the wheel, then jerks are reduced and driving comfort is improved, but the system response becomes delayed and less responsive
Solution Approach 1:
The patent applies dynamics by making the ramp slope adaptive rather than fixed. The slope of the torque correction ramp is dynamically adjusted based on real-time wheel slip detection and grip conditions. When slip is detected, the ramp slope increases to provide faster torque correction; when grip is sufficient, the slope decreases to maintain comfort. This dynamic adaptation resolves the contradiction between responsiveness and comfort.
Solution Approach 2:
The patent changes the parameter of ramp slope based on wheel grip conditions and slip detection. By varying the slope parameter according to actual driving conditions (using grip coefficient and slip rate information), the system achieves both fast response when needed and smooth operation when not needed, thereby resolving the contradiction between response speed and driving comfort.
2Reliability
If conventional traction control systems brutally correct slip errors, then wheel slip is quickly reduced, but driving comfort and safety deteriorate due to jerks and unresponsive torque correction
Solution Approach 1:
The patent applies partial action by selectively applying torque correction only when and where slip is detected. Instead of brutal full-correction, the system applies partial torque adjustment proportional to the detected slip condition. The correction magnitude is modulated based on grip coefficient and slip rate, providing just enough correction to maintain reliability while avoiding excessive action that would cause jerks and discomfort.
Solution Approach 2:
The patent implements feedback by continuously monitoring wheel slip, grip coefficient, and torque application. The system uses this feedback to dynamically adjust the torque correction ramp slope, creating a closed-loop control that ensures effective slip correction while maintaining driving comfort. The feedback mechanism allows the system to respond appropriately to actual wheel conditions rather than applying fixed brutal correction.
3Speed
If the torque correction signal is adapted to wheel grip using reference torque measurement, then responsiveness is improved, but system complexity increases due to additional measurement and calculation means
Solution Approach 1:
The patent applies universality by making existing traction control components perform multiple functions. The reference torque measurement means not only provides baseline torque data for adaptation but also serves as part of the overall torque control system. The calculation means that adapts ramp slope based on grip also processes slip detection and correction signal generation. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity.
Solution Approach 2:
The patent applies preliminary action by pre-measuring and storing reference torque values before slip occurs. This preliminary measurement allows the system to quickly adapt torque correction without complex real-time calculations during slip events. By preparing reference data in advance, the system achieves responsive torque adaptation while minimizing the computational complexity required during critical slip correction moments.
Data Source
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AI summary
The invention relates to a driveability control system for a motor vehicle, which includes: means for determining the skidding of at least one of the wheels of the vehicle relative to the ground, processing means (26) capable of emitting a ramp signal to correct the torque to be transmitted to at least one of the wheels of the vehicle, and means for correcting the torque to be transmitted to said wheel in accordance with said correction signal. The means for determining the skidding include a measurement means for measuring the reference torque transmitted to the wheel prior to the skidding thereof, the processing means including a means for storing the reference torque and for calculating the correction signal from the stored reference torque.