Variable Regenerative Torque Traction Control
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Solution Overview
Problem
Conventional traction control devices for vehicles struggle to smoothly and quickly control driving wheel slippage due to constant regenerative torque, which can be excessive or insufficient based on road surface conditions, leading to abrupt acceleration variations or prolonged slippage suppression.
Innovation Solution
A traction control device that detects slippage and adjusts regenerative torque from an electric motor based on road surface conditions using various index parameters such as driving wheel speed, vehicle acceleration, and coefficient of friction, allowing for variable torque control to suit changing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant regenerative torque is applied to the driving wheel, then the structure is simple, but the slippage control becomes unstable under varying road conditions
Solution Approach 1:
The patent applies dynamics by transitioning from constant torque control to variable torque control. The regenerative torque is dynamically adjusted based on the detected road surface coefficient of friction, allowing the system to adapt to changing road conditions and maintain stable slippage control throughout the braking process
Solution Approach 2:
The patent changes the torque parameter from a fixed constant value to a variable value that depends on the road surface condition. By detecting the coefficient of friction and adjusting the regenerative torque accordingly (applying smaller torque on low-friction surfaces and larger torque on high-friction surfaces), the system resolves the contradiction between structural simplicity and control stability
2Productivity
If high regenerative torque is applied, then slippage suppression speed is improved, but abrupt acceleration variation occurs on high friction surfaces
Solution Approach 1:
The patent changes the torque parameter based on road surface conditions. On high friction surfaces, a smaller regenerative torque is applied to prevent abrupt acceleration variations, while on low friction surfaces, a larger torque is applied to achieve faster slippage suppression. This dynamic parameter adjustment resolves the contradiction between suppression speed and acceleration smoothness
Solution Approach 2:
The patent applies different torque levels to match different road surface conditions. Instead of using a uniform high torque level in all conditions, the system locally adapts the torque magnitude to the specific friction characteristics of the road surface, ensuring smooth acceleration while maintaining effective slippage control
3Ease of operation
If low regenerative torque is applied, then acceleration smoothness is improved, but slippage suppression time is prolonged on low friction surfaces
Solution Approach 1:
The patent adjusts the torque parameter based on detected road surface friction. On low friction surfaces, a larger regenerative torque is applied to achieve faster slippage suppression, while on high friction surfaces, a smaller torque is used to maintain acceleration smoothness. This dynamic adjustment resolves the contradiction between suppression time and acceleration smoothness
Solution Approach 2:
The system dynamically changes the torque level according to real-time road condition detection. By making the torque adaptive rather than fixed, the system can optimize the balance between suppression speed and smoothness for each specific driving condition, resolving the time-smoothness contradiction
4Adaptability or versatility
If variable regenerative torque control is implemented, then slippage control adaptability is improved, but control system complexity increases
Solution Approach 1:
The patent implements feedback by detecting the road surface coefficient of friction and using this information to adjust the regenerative torque. The detection unit continuously monitors road conditions and feeds this information back to the control unit, which then adapts the torque level accordingly. This feedback mechanism provides the necessary adaptability while keeping the control logic relatively simple
Solution Approach 2:
The system uses the vehicle's existing detection capabilities to automatically determine road surface conditions and adjust torque without requiring complex external intervention. The control system serves itself by using detected friction data to autonomously optimize torque application, achieving adaptability with minimal additional complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively suppresses driving wheel slippage smoothly and quickly, avoiding abrupt elimination or prolonged suppression, by dynamically adjusting regenerative torque according to road surface conditions, ensuring stable vehicle acceleration.
Implementation Method 1
an electric motor that is coupled to a driving wheel of the vehicle and is capable of carrying out a regenerative operation to produce a regenerative torque
Data Source
AI summary
An electric motor is coupled to driving wheels 2, 2. When a slippage of the driving wheels 2, 2 is detected, the electric motor 5 produces a regenerative torque to suppress the slippage of the driving wheels 2, 2. The regenerative torque is controlled in a variable manner according to an index parameter that indicates a road surface condition. Thus, when the slippage of the driving wheels occurs, the slippage of the driving wheels is suppressed according to the road surface condition by a regenerative operation of the electric motor coupled to the driving wheels.