High-Torque Braking Control for Hydrostatic Heavy-Duty Vehicles
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Solution Overview
Problem
Heavy-duty vehicles with hydrostatic transmission systems operating in high-speed, low-torque mode often fail to meet braking standards, particularly in heavy loads and high speeds, leading to inadequate braking distance and time.
Innovation Solution
A method to automatically activate a high-torque braking system by detecting a change in the speed-controller lever position from a high-speed, low-torque mode to a low-speed, high-torque mode using existing hardware and software, without requiring operator intervention, allowing for quicker and more responsive braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the vehicle operates in high-speed, low-torque mode, then productivity is improved, but braking distance and braking time increase
Solution Approach 1:
The system dynamically switches between high-speed low-torque mode and low-speed high-torque mode based on braking conditions. The controller detects when braking is required and automatically transitions the propulsion system to the appropriate mode, making the vehicle's operational characteristics adaptable rather than fixed.
Solution Approach 2:
The invention changes the operational parameters of the propulsion system by switching between two distinct modes: high-speed low-torque for normal operation and low-speed high-torque for braking. This parameter switching allows the vehicle to optimize both productivity and braking performance.
2Productivity
If the vehicle operates in high-speed, low-torque mode, then productivity is improved, but braking distance increases
Solution Approach 1:
The system dynamically switches between high-speed low-torque mode and low-speed high-torque mode based on braking conditions. The controller detects when braking is required and automatically transitions the propulsion system to the appropriate mode, making the vehicle's operational characteristics adaptable rather than fixed.
Solution Approach 2:
The system prepares for braking by having the low-speed high-torque mode ready to activate immediately when braking conditions are detected. This preliminary preparation ensures that the vehicle can transition quickly to the braking-optimized state, reducing both braking time and distance.
3Ease of operation
If manual mode switching is required for braking, then ease of operation is reduced, but braking responsiveness is improved
Solution Approach 1:
The system performs the mode switching automatically without requiring operator intervention. The controller monitors braking conditions and self-manages the transition between operational modes, eliminating the need for the operator to manually change modes while maintaining quick response time.
Solution Approach 2:
The system uses feedback from braking condition detection to automatically trigger mode switching. The controller continuously monitors operational parameters and uses this feedback to determine when to switch modes, creating a closed-loop control system that responds automatically to changing conditions.
Data Source
AI summary
A method of automatically activating a high-torque braking system in a heavy-duty vehicle configured to operate in at least one low speed, high torque mode and at least one higher speed, lower torque mode is disclosed. The method includes determining a speed-controller device such as a joystick or lever of the vehicle is in a first position which results in the vehicle travelling in a higher-speed, lower-torque mode, and, responsive to detecting braking and a change in position of the speed-controller from the first position to a second, neutral, position, activating a low-speed high torque mode of operation for braking the vehicle.