Brake Traction Control via ABS Module in 4x4 Vehicles
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Solution Overview
Problem
Existing four-wheel drive vehicles face challenges in maintaining traction, particularly off-road, due to the added weight, expense, and maintenance requirements of limited slip and locking differentials, which are necessary for traction control but increase complexity and weight.
Innovation Solution
Implementing a brake traction control system that selectively activates only in 4x4 drive mode using an open differential, where an ABS module senses the drive mode switch to apply brake traction control when needed, reducing the need for additional mechanical components and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a limited slip differential or locking differential is used to provide traction control, then traction control capability is improved, but device complexity, weight, and maintenance requirements increase
Solution Approach 1:
The patent replaces the mechanical differential system (limited slip or locking differential) with an electronic brake traction control system. The ABS module detects wheel slip conditions and applies braking force to the slipping wheel, transferring power to the wheel with traction through differential braking. This electronic control system eliminates the need for complex mechanical differential mechanisms, reducing device complexity while maintaining traction control capability.
Solution Approach 2:
The patent introduces the ABS module as an intermediary between the open differential and the brake assemblies. The ABS module senses wheel rotation speeds, detects slip conditions, and selectively applies braking force to control power distribution to wheels. This intermediary electronic control system enables traction control without requiring mechanical modifications to the differential itself.
2Reliability
If a limited slip differential or locking differential is installed for traction control, then traction control is achieved, but vehicle weight increases
Solution Approach 1:
The patent replaces heavy mechanical differential components (limited slip or locking differential mechanisms) with a lighter electronic brake control system. The existing open differential remains unchanged, and traction control is achieved through electronic control of the brake assemblies already present on the vehicle. This substitution significantly reduces the additional weight that would be imposed by mechanical traction control differentials.
Solution Approach 2:
The patent utilizes the existing ABS brake system, which is already installed on the vehicle for anti-lock braking purposes, and repurposes it to also provide traction control functionality. This multi-functionality approach avoids adding separate dedicated traction control mechanisms, thereby minimizing weight increase while achieving both braking and traction control functions through the same hardware.
3Reliability
If a limited slip differential or locking differential is used, then traction control is provided, but maintenance requirements increase
Solution Approach 1:
The patent replaces mechanical differential systems that require specialized maintenance (limited slip or locking differential mechanisms) with an electronic brake control system. The electronic ABS module and existing brake assemblies have simpler maintenance requirements compared to complex mechanical differentials. This substitution reduces maintenance complexity and improves ease of repair while maintaining traction control functionality.
Solution Approach 2:
The patent implements a system where the existing brake infrastructure serves dual purposes (braking and traction control), eliminating the need for separate maintenance schedules and procedures for dedicated traction control mechanisms. The electronic control system automatically adapts to wheel slip conditions without requiring manual intervention or specialized service, reducing overall maintenance burden.
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
This solution allows for effective traction control in 4x4 mode while minimizing weight and maintenance by using electronic brake traction control, avoiding the disadvantages of traditional differentials, and only engaging when necessary, thus enhancing vehicle performance and efficiency.
Implementation Method 1
a first left brake assembly operatively connected to the left driven wheel; a first right brake assembly operatively connected to the right driven wheel
Data Source
AI summary
A vehicle includes front suspension assemblies; rear suspension assemblies; a left driven wheel and a right driven wheel with first left and right brake assemblies; a left wheel and a right wheel with second left and right brake assemblies; an anti-lock braking system (ABS) module; a drive mode coupler connected between the transmission and the left and right wheels for changing between a 2×4 and a 4×4 drive configuration; and a drive mode switch for controlling the drive mode coupler, the ABS module selectively performing brake traction control of at least one wheel based on the position of the drive mode switch. A method for controlling traction of the vehicle includes sensing the drive mode switch position and when the drive mode changes from a 2×4 position to a 4×4 position, causing the ABS module to perform brake traction control on at least one wheel.