Hydrostatic Emergency Braking With Simultaneous SAHR Activation
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Solution Overview
Problem
Existing emergency brake systems in vehicles with hydrostatic drives, such as agricultural and work vehicles, suffer from long reaction times, leading to delayed braking action and a sense of helplessness for the operator.
Innovation Solution
The proposed solution simultaneously activates both the SAHR (Spring Applied Hydraulically Released) parking brake system and the hydrostatic transmission braking system upon detection of a service brake failure, thereby reducing the overall braking delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the SAHR parking brake system is activated automatically in response to service brake failure, then the emergency braking capability is improved, but the reaction time delay of more than 1.5 seconds causes operator helplessness and danger
Solution Approach 1:
The controller is configured to predict the need for emergency braking by monitoring service brake performance parameters before actual failure occurs. By detecting degradation trends in service brake response time and effectiveness, the system prepares the SAHR parking brake system in advance, reducing the effective reaction time when emergency braking is needed.
Solution Approach 2:
The controller acts as an intermediary between the service brake system and the SAHR parking brake system. It continuously monitors service brake performance and intermediates the activation of the SAHR system, smoothing the transition and reducing the perceived delay by coordinating the activation timing based on predicted failure conditions.
2Ease of operation
If the proportional valve is used to activate the emergency brake, then the braking force can be controlled proportionally to the brake pedal position, but the system complexity increases
Solution Approach 1:
The controller is designed to perform multiple functions: it monitors service brake performance, predicts failure conditions, determines optimal activation timing, and controls the SAHR parking brake system. By consolidating these functions into a single controller, the patent reduces overall system complexity while maintaining proportional braking force control capability.
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 approach significantly reduces the braking delay, allowing the vehicle to stop earlier and brake more gradually, enhancing operator safety and confidence by eliminating the feeling of helplessness during emergency braking.
Implementation Method 1
an elastic element pushes the brake towards the braking position
Implementation Method 2
a pressurized diaphragm opposes the elastic action, disengaging the parking brake
Implementation Method 3
the hydrostatic transmission unit HY is suitable for creating a hydrostatic braking system to exert a braking action on the vehicle
Implementation Method 4
The service brake comprises friction members designed to contact each other by developing frictional forces
Data Source
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AI summary
Emergency brake method and system method of exerting an emergency braking action in order to slow and/or stop a hydrostatic drive (HY) vehicle (VEH) during a service brake (SB) failure condition, where the brake service includes friction elements arranged to brake the vehicle (VEH) in response to a brake request; the method including, in the event of a service brake failure, a first step of automatically activating a SAHR spring parking brake system (SAHR), a second step to automatically activate hydrostatic braking, to exert said braking action, to complement said service brake system, by carrying out said emergency braking, and wherein said first and second steps are performed automatically and simultaneously in response to said braking request.