Hydrostatic Travel Drive Reversing With Automatic Brake Assistance
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Solution Overview
Problem
The mechanical loading of hydrostatic drive train components in working vehicles is undesirably high during changes in travel direction due to inadequate deceleration support by the driver, especially when the vehicle is heavily loaded.
Innovation Solution
An electronically controllable brake system assists in decelerating the vehicle by actuating the brakes automatically upon a change in travel direction, using sensors to determine the appropriate brake pressure based on driving speed and mechanical loading parameters, and releasing the brakes before the vehicle stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver does not actively support the deceleration by pressing the brake pedal, then the change in direction can be triggered without additional driver input, but the mechanical loading of the hydrostatic drive train components becomes undesirably high
Solution Approach 1:
The system automatically detects the driver's intent to change direction through the operating element and autonomously actuates the brake circuit to assist deceleration, making the system self-serving by eliminating the need for additional driver brake input while protecting against excessive mechanical loading
Solution Approach 2:
The control unit continuously monitors the state of the operating element and vehicle motion, and automatically activates the brake circuit when a direction change is detected, creating a feedback loop that responds to driver intent and protects the hydrostatic drive train from excessive loading
2Strength
If the brakes are actuated automatically upon change in travel direction, then the mechanical loading of hydrostatic drive train components is reduced, but the complexity of the brake control system increases
Solution Approach 1:
The existing brake control unit is utilized to perform both its traditional brake control functions and the new automatic brake assistance function for direction changes, making the system multi-functional and avoiding the need for a completely separate control system
Solution Approach 2:
The automatic brake assistance function is integrated into the existing brake control system by having the control unit monitor the operating element state and automatically activate the brake circuit when direction change is detected, merging multiple functions into a single control architecture
Data Source
AI summary
A method is disclosed for controlling a change in the direction of travel of a working vehicle between forward travel and rearward travel or vice versa. The working vehicle has an electronically controllable hydrostatic travel drive, a power-operated brake system with at least one electronically controllable brake circuit, and an electronic brake-control unit for controlling the travel drive and the brake circuit. While the vehicle is traveling in a first direction, a change in the direction of travel is triggered by a switchover of the hydrostatic travel drive by means of an assigned manual operating element. To reduce the mechanical loading, the deceleration of the working vehicle can be assisted by automatically actuating the brakes of the electronically controllable brake circuit, where these brakes are actuated by being triggered by the switchover of the operating element and are released by the time the vehicle comes to a standstill.