Vehicle Brake System with Adaptive Fade Detection
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Solution Overview
Problem
Current vehicle braking systems face challenges in maintaining precise control, especially under adverse conditions, leading to wheel lock-up and loss of directional control, and require optimal slip levels at both front and rear axles for maximum braking performance and stability.
Innovation Solution
A hydraulic braking system with an electronic control unit (ECU) and solenoid actuated valves for ABS, traction control, and regenerative braking, which dynamically controls brake pressures between the front and rear wheels, and includes a plunger assembly with dual acting capabilities to provide pressure in both forward and reverse directions, ensuring consistent braking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a driver applies excessive braking pressure under adverse conditions, then braking force is increased, but wheel lock-up occurs resulting in loss of directional control
Solution Approach 1:
The ABS system continuously monitors wheel rotational behavior and uses this feedback to dynamically adjust brake pressure. When wheel lock-up is detected, the system automatically relieves pressure; when optimal braking is detected, it maintains or increases pressure, creating a closed-loop control system that prevents loss of directional control while maximizing braking force
Solution Approach 2:
The system dynamically adjusts brake pressure in real-time based on actual wheel behavior rather than using fixed pressure control. The electronic control unit continuously modulates the brake apply and release rates, transforming the static brake system into a dynamic one that adapts to changing road conditions and wheel slip characteristics
2Force
If brake pressures are proportioned between front and rear brakes, then maximum braking forces are achieved at each axle, but system complexity increases with DRP controls
Solution Approach 1:
The ABS valve assembly serves multiple functions: it controls individual wheel brake pressure for ABS operation, provides dynamic rear proportioning by selectively controlling rear wheel pressure, and works with the electronic control unit to manage traction control and other vehicle dynamics functions. This multi-functionality eliminates the need for separate DRP hardware systems
Solution Approach 2:
The patent combines the DRP control functionality with the existing ABS valve assembly and electronic control unit. Rather than adding separate mechanical DRP proportioning devices, the system merges rear brake pressure control into the electronic control architecture that already manages front and rear brake circuits, reducing overall system complexity
3Measurement precision
If ABS valves operate in three pressure control modes, then wheel slip is controlled within selected range, but valve complexity increases with apply and dump valves
Solution Approach 1:
The ABS valve assembly is segmented into functionally independent apply valves and dump valves for each wheel circuit. This segmentation allows each valve to be optimized for its specific function (apply or release) while working together under electronic control to achieve precise slip management through the three pressure control modes
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 system achieves optimal braking performance by dynamically controlling brake pressures, maintaining vehicle stability, and ensuring smooth transitions between regenerative and hydraulic braking, enhancing safety and control.
Implementation Method 1
solenoid actuated valves for ABS, traction control, and regenerative braking
Implementation Method 2
the master cylinder generates hydraulic forces in both brake circuits by pressurizing brake fluid. The pressurized fluid travels through the fluid conduit in both circuits to actuate brake cylinders at the wheels
Implementation Method 3
wheel brakes in each circuit... actuate brake cylinders at the wheels to slow the vehicle
Data Source
AI summary
A method of detecting brake fade for a vehicle brake system having wheel brakes susceptible to brake fade, includes the steps of: (a) providing a brake system including wheel brakes; and (b) determining the presence of brake fade within the vehicle system utilizing adaptive references maps, and wherein the adaptive reference maps include storing vehicle deceleration data and brake system fluid volume at different pressure points in a histogram.