Hydraulic Machine Brake Light Actuation via Pedal Linkage
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Solution Overview
Problem
Incorporating brake light systems that detect hydrostatic deceleration and illuminate brake lights even when the service brake is not activated is difficult and costly in hydraulically powered working machines.
Innovation Solution
A method for automatically actuating brake lights in a hydraulic transmission system of a working machine by using a control circuit that monitors travel conditions, including travel speed, gear selection, and travel pedal pressure, to turn on brake lights when certain deceleration criteria are met, even if the service brake is not engaged, utilizing sensors and switches to detect changes in travel direction and pedal position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If brake light systems detect hydrostatic deceleration and illuminate brake lights even when service brake is not activated, then safety is improved, but system complexity and cost increase
Solution Approach 1:
The patent replaces complex hydrostatic deceleration detection systems with a simpler mechanical linkage system. The brake light actuator is mechanically connected to the service brake pedal through a linkage mechanism that detects pedal movement and triggers brake light illumination based on pedal position rather than requiring complex hydrostatic pressure sensing and deceleration calculation systems.
Solution Approach 2:
The brake light actuator system utilizes the existing service brake pedal mechanism and its movement to automatically trigger brake light illumination. The mechanical linkage system self-actuates based on the natural movement of the brake pedal during service braking, eliminating the need for separate sensors, actuators, and control systems that would otherwise be required to detect deceleration and control brake lights.
2Device complexity
If brake lights are activated only when service brake pedal is pushed, then system simplicity is maintained, but safety deteriorates during hydraulic braking
Solution Approach 1:
The mechanical linkage system serves multiple functions: it detects service brake pedal movement to illuminate brake lights during service braking, and simultaneously responds to hydraulic braking conditions by detecting changes in brake pedal position caused by hydraulic pressure changes. This single mechanical system provides universal brake light activation for both service and hydraulic braking modes without requiring separate detection systems.
Data Source
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AI summary
A method for actuating a brake light of a hydraulic driven working machine comprising an equipment to detect the condition of travel including a travel speed sensor (14), a gear selector switch (16), a travel direction switch (19) and a travel pedal pressure sensor (20), wherein the equipment automatically activates a brake light (27) via a control circuit (40) depending on the selected gear if the machine decelerates without the brake pedal (24) being pushed.