Wheel Slip Control Torque Adjustment
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Solution Overview
Problem
Traditional wheel slip control systems in vehicles fail to manage wheel slip effectively during deceleration and aggressive driving conditions, particularly when the traction control system is disabled, leading to inefficiencies in fuel economy and drivability.
Innovation Solution
A wheel slip control system that utilizes wheel speed sensors and a control module to detect and manage torque production of the engine and electric motor, adjusting torque to prevent negative wheel slip and disabling fuel efficiency functions during aggressive driving to maintain drivability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fuel delivery to the engine is deactivated during deceleration to improve fuel economy, then fuel efficiency is improved, but negative wheel slip occurs due to increased negative drive-axle torque from back-driving the engine, EMG, and AC
Solution Approach 1:
The control module continuously monitors wheel speed signals from sensors and detects negative wheel slip conditions. When negative wheel slip is detected during deceleration with fuel delivery deactivated, the control module responds by increasing torque production from the engine or electric motor, or by decreasing AC compressor capacity, thereby correcting the wheel slip condition while maintaining fuel efficiency benefits
Solution Approach 2:
The system dynamically changes operational parameters including fuel delivery state, torque production levels, and AC compressor capacity based on detected wheel slip conditions. During deceleration, the system can switch between fuel-deactivated mode and torque-adjustment mode to prevent negative wheel slip, optimizing both fuel efficiency and wheel slip control
2Ease of operation
If the traction control system is disabled during aggressive driving to allow positive wheel slip, then driver control and performance are improved, but wheel slip cannot be controlled when brakes are not applied
Solution Approach 1:
The control system segments wheel slip control into independent functions: traditional ABS handles braking-related wheel slip, while the new system independently handles non-braking wheel slip conditions by monitoring wheel speed signals and adjusting torque production separately from brake application status
Solution Approach 2:
The control module continuously monitors wheel speed signals and detects positive wheel slip conditions even when traction control is disabled. When positive wheel slip is detected and brakes are not applied, the control module increases torque production to control the wheel slip, providing an additional layer of control that operates independently of the traditional traction control system
Data Source
AI summary
A wheel slip control system includes wheel speed sensors that generate wheel speed signals and a control module that controls torque production of at least one of an engine and an electric motor and that detects a negative wheel slip based on the wheel speed signals. The control module increases torque production of at least one of the engine and the electric motor when the negative wheel slip is detected.