Hydraulic Brake Unit Feedback Control for Smooth Mobile Machine Braking
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Solution Overview
Problem
Existing braking systems in mobile work machines, such as wheel loaders and dumpers, lack sensitivity and comfort in braking, with inharmonious transitions between inch braking and deceleration, and are not cost-effective, often resulting in vibrations and stick-slip effects.
Innovation Solution
A hydraulic braking system with a brake sensor and electronic control unit that monitors and regulates the braking process, using sensors to detect braking parameters and adjust the braking effect for improved safety and comfort, and includes a sensor actuator to generate additional braking force for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If servo brakes or stepped pistons are used to reduce pedal force, then the required actuation stroke is reduced, but sensitivity and controllability at the beginning of the braking process suffer and transitions become inharmonious
Solution Approach 1:
The patent implements a feedback control system where a brake sensor detects the actual braking effect and feeds this information back to a control unit. The control unit adjusts the servo assistance dynamically based on the detected braking parameter, ensuring optimal sensitivity and controllability throughout the braking process while maintaining ease of operation.
Solution Approach 2:
The patent employs dynamic adjustment of the servo assistance characteristic through electronic control. The control unit can adaptively modify the braking assistance in real-time based on operating conditions, transitioning smoothly between different braking phases (inching to service braking) and eliminating the inharmonious transitions characteristic of fixed-ratio servo systems.
2Loss of energy
If hydrostatic drive braking is used for initial deceleration, then energy efficiency is improved, but the transition to service braking by brake cylinder is inharmonious
Solution Approach 1:
The control unit receives feedback from the brake sensor about the actual braking effect and coordinates the transition between hydrostatic drive braking and service braking accordingly. This feedback mechanism ensures smooth, harmonious transitions by adjusting the servo assistance to match the deceleration phase, eliminating the inharmonious transitions criticized in prior art.
3Ease of manufacture
If conventional brake systems are used, then cost is reduced, but braking effect cannot be precisely controlled and operator feedback is lacking
Solution Approach 1:
The patent introduces a brake sensor that detects the actual braking effect and provides feedback to the control unit. This feedback loop enables precise control of the braking effect and provides the operator with perceptible feedback, while the electronic control system manages the complexity to maintain cost-effectiveness.
Solution Approach 2:
The patent replaces purely mechanical brake systems with an electronically controlled hydraulic system. The electronic control unit and brake sensor substitute for complex mechanical linkages, providing precise control and feedback while maintaining reasonable cost through the use of electronic rather than mechanical components.
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 provides a finely metered braking effect with perceptible feedback, improving safety and comfort, allowing for flexible and tunable operation with harmonious brake pressure build-up and reduced vibrations, while being cost-effective.
Implementation Method 1
the brake unit is designed as a hydraulic brake unit comprising at least one brake fluid
Implementation Method 2
at least one brake sensor is provided for detecting a braking parameter, and that the brake sensor/brake parameter is designed to control/regulate the hydraulic brake unit
Implementation Method 3
includes a sensor actuator to generate additional braking force for enhanced control
Data Source
Figure 1~2
AI summary
A mobile working machine is described, comprising a vehicle frame and a drive unit for driving at least one drive wheel rotatable about a drive axis, wherein at least one working tool and/or a tool holding device for holding the working tool is provided, wherein at least one brake unit (10) having at least one brake element (HA, VA) is provided for braking the at least one drive wheel, wherein the brake unit (10) is designed as a hydraulic brake unit (10) comprising at least one brake fluid, wherein at least one brake pedal (20) is provided for manual actuation by an operator and for pressurizing the brake fluid, wherein the hydraulic brake unit (10) comprises at least one cylinder-piston unit (1) with at least one between a brake cylinder housing (1.2) and a brake piston (1.1) arranged piston chamber, which at least partially improves upon the disadvantages of the prior art. This is achieved according to the invention by providing at least one brake sensor (3) for detecting a brake parameter and by designing the brake sensor (3) and/or brake parameter to control/control/regulate the hydraulic brake unit (10) and/or the cylinder-piston unit (1) and/or the hydraulic pressure of the piston chamber.