Parking Brake Control for Electric Terrain Vehicles
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Solution Overview
Problem
Existing electric terrain working vehicles lack an efficient mechanism to ensure the parking brake engages only when the operator is not present, leading to unnecessary wear and potential safety hazards due to premature engagement during operator movement or terrain irregularities.
Innovation Solution
An operator presence system that detects the operator's presence and provides a presence indication to a controller, which controls the parking brake to engage or disengage, with a delay in engagement to prevent false triggering, ensuring the brake only engages when the operator is not on the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake engages automatically when the operator leaves the vehicle, then vehicle safety is improved, but premature engagement during operator movement or terrain irregularities causes unnecessary wear and potential safety hazards
Solution Approach 1:
The system performs preliminary detection of operator presence through sensors (seat occupancy, pedal position, steering wheel angle) before triggering parking brake engagement. This preliminary action filters out false triggers from temporary operator movements or terrain irregularities, ensuring the brake only engages when the operator has truly departed the vehicle.
Solution Approach 2:
The controller continuously monitors operator presence indicators and uses this feedback to control parking brake engagement. The system waits for a predetermined period after detecting operator absence before engaging the brake, using feedback loops to confirm sustained absence and prevent premature engagement while maintaining safety.
2Speed
If the parking brake engages immediately upon detecting operator absence, then response time is improved, but false triggering during operator movement reduces system reliability
Solution Approach 1:
The system implements a predetermined time delay as a preliminary filtering mechanism. After detecting operator absence, the controller waits for this delay period to elapse before engaging the parking brake. This preliminary time-based action eliminates false triggers from temporary operator movements while maintaining relatively fast response to actual operator departure.
Solution Approach 2:
The system dynamically adjusts the engagement timing based on detected operator presence patterns. By implementing a time delay parameter that can be configured or adapted, the system optimizes the balance between rapid response to operator absence and filtering out transient movements, making the response characteristic adaptable to different operating conditions.
Data Source
AI summary
An electric terrain working vehicle having a parking brake actuated in response to an operator presence system detecting the presence of, or the absence of, an operator in relation to the electric terrain working vehicle. The operator presence system may send a signal to a controller and the controller may command the actuation of the parking brake between an engaged stated and a disengaged state.