BEV Line Lock Control for Front Brake Hold and Rear Torque Split
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Solution Overview
Problem
Existing vehicle traction control systems prevent line lock events by setting fault codes when rear wheels spin while front wheels are stationary, limiting the ability of experienced drivers to perform rear-wheel burnouts for improved traction.
Innovation Solution
A vehicle system and method that enables a line lock mode by applying brakes to the front wheels and disabling torque delivery to them while sending drive torque to the rear wheels, initiated through a user-selectable interface and satisfying specific vehicle conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the traction control system prevents wheel spinning to maintain vehicle stability, then vehicle stability is improved, but the ability to perform line lock maneuvers is lost
Solution Approach 1:
The system dynamically adjusts traction control intervention based on detected driver intent. When line lock conditions are detected (brake pedal pressed, clutch disengaged, accelerator pressed), the system temporarily disables traction control on the driven wheels, allowing controlled spinning while maintaining stability control on non-driven wheels. This dynamic switching resolves the contradiction by making the system adaptable to different operational modes.
Solution Approach 2:
The system changes the parameter of traction control activation status from 'always active' to 'conditionally active'. By monitoring multiple parameters (brake pedal position, clutch state, accelerator position, wheel speed differential), the system transitions traction control between enabled and disabled states, allowing line lock maneuvers when conditions indicate driver intent while maintaining stability during normal operation.
2Reliability
If the traction control system activates fault codes when rear axle spins while front wheels are stationary, then system reliability is improved through fault detection, but the usability for intentional line lock maneuvers is reduced
Solution Approach 1:
The system performs preliminary detection of line lock conditions by monitoring brake pedal position, clutch state, and accelerator position before fault code activation occurs. When these conditions are detected, the system preemptively disables traction control and suppresses fault code generation, preventing the contradiction from manifesting. This preliminary action allows intentional line lock maneuvers without triggering unwanted fault codes while maintaining reliable fault detection for actual problems.
3Productivity
If brakes are applied to front wheels while torque is delivered to all wheels, then line lock effect is achieved, but vehicle control and safety are compromised
Solution Approach 1:
The system segments torque delivery by wheel group during line lock maneuvers. When line lock conditions are detected and the driver releases the brake pedal, the system delivers torque only to the driven rear wheels while maintaining zero torque to the front wheels. This segmentation achieves effective line lock (rear wheel spinning) while maintaining safety through controlled front wheel behavior and continuous monitoring of vehicle conditions.
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
Enables experienced drivers to perform line lock maneuvers safely and effectively, enhancing traction by heating rear tires without triggering fault codes.
Implementation Method 1
The controller applies brakes to the left and right front wheels
Implementation Method 2
Line lock events are typically intended to heat the rear tires for improved traction
Data Source
AI summary
A vehicle system for a vehicle that implements a line lock mode to vehicle wheels for creating a line lock includes a motor, an instrument panel and a controller. The motor provides drive torque to at least one wheel of the vehicle wheels for propelling the vehicle. The vehicle wheels include a left and right rear wheels and left and right front wheels. The instrument panel cluster is configured to display a user interface menu that includes a user selectable line lock mode. The controller initiates a line lock mode based on user selection of the line lock mode. The controller determines whether vehicle conditions are satisfied. The controller applies brakes to the left and right front wheels. The controller disables torque delivery to the left and right front wheels and sends drive torque to the left and right rear wheels.