Hydrostatic Traction Drive Inch Brake Trailer Control
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Solution Overview
Problem
Existing vehicles with hydrostatic drives experience undesired pushing of trailers onto the vehicle during inching braking, leading to inefficient and compromised braking solutions.
Innovation Solution
Implementing a system where inching braking triggers predetermined trailer braking, with adjustable control through a brake operating element and sensor arrangement, ensuring proportional trailer braking relative to inching actuation, and allowing independent control during service braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If inching braking is actuated by changing the speed ratio of the hydrostatic transmission, then the diesel unit provides a braking effect, but the trailer is pushed onto the vehicle causing harmful contact
Solution Approach 1:
The patent applies preliminary action by triggering the trailer brake before the harmful pushing effect occurs. The control unit detects inching braking activation and immediately actuates the trailer brake in proportion to the inching braking magnitude, preventing the trailer from being pushed onto the vehicle while maintaining the desired braking effect on the main vehicle.
Solution Approach 2:
The trailer brake serves as an intermediary element that mediates between the inching braking action and the trailer. By introducing this intermediate braking force on the trailer, the system prevents direct harmful interaction (pushing) between the trailer and vehicle while maintaining overall braking control.
2Reliability
If sensors are used to detect trailer pushing and trigger trailer brake, then trailer pushing is addressed, but the solution is reactive and represents only a compromise
Solution Approach 1:
The patent eliminates reaction time delay by implementing preliminary action - the trailer brake is triggered immediately upon detection of inching braking activation, before any harmful pushing occurs. This proactive approach replaces the reactive sensor-based solution, ensuring reliable trailer brake engagement without time loss.
3Stability of the object's composition
If the trailer brake is triggered proportionally to inching braking, then stable braking of the combination is achieved, but the control system complexity increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the magnitude of inching braking activation and using this information to proportionally adjust the trailer brake force. The control unit receives signals about the inching braking state and automatically adjusts the trailer brake accordingly, achieving stable braking control through a relatively simple feedback loop.
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
Prevents trailer pushing onto the vehicle during inching braking, ensuring stable and controlled braking of both the truck and trailer combination, even under varying conditions.
Implementation Method 1
The travel drive has a hydrostatic transmission with hydrostatic pump and hydrostatic motor, which are arranged in a closed hydraulic circuit. The hydrostatic pump is regularly driven by a diesel unit.
Data Source
AI summary
The vehicle (1) has a hydrostatic traction drive (2) comprising a hydrostatic gearbox (4) that is arranged in a drive train. The traction drive provides a function of an inch brake that is actuatable independent of a service brake (3). A trailer (7) is coupled with the vehicle and actuatable by a trailer brake (8) on the vehicle. An inch braking process triggers a predetermined trailer braking process in a predetermined operation mode. An electrical sensor arrangement (10) is attached to a brake control element (9) for sensory acquisition of deflection (A) of the control element. The electrical sensor arrangement comprises an absolute sensor e.g. potentiometer and magnetoresistive (MR) sensor, or an incremental sensor i.e. hall sensor. Independent claims are also included for the following: (1) a full trailer combination (2) a method for operating a vehicle.