Work Vehicle Brake Control System for Slope Parking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The negative-type parking brake system experiences a time lag between the output of a parking brake instruction and its full operation, which can be inconvenient for operators, especially when operating on slopes, as they need to continuously press the brake pedal until the parking brake is fully engaged.
Innovation Solution
A control system that automatically operates the service brake device upon receiving a parking brake instruction from the operator, regardless of pedal operation, until the parking brake force reaches a predetermined value, incorporating features like oil temperature detection to adjust the operation time and vehicle speed detection to prevent sudden braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operator continuously presses the brake pedal until the parking brake is fully engaged, then the vehicle can be reliably stopped, but the operation becomes cumbersome and time-consuming
Solution Approach 1:
The service brake is activated automatically and preliminarily when the parking brake switch is operated, providing immediate braking force before the parking brake is fully engaged. This preliminary action ensures the vehicle is secured during the time lag period without requiring the operator to continuously press the brake pedal.
Solution Approach 2:
The control device acts as an intermediary between the parking brake switch and the service brake device. It detects the parking brake instruction and automatically activates the service brake, mediating the time lag between the operator's input and the parking brake's full engagement.
2Reliability
If the service brake operates concurrently with the parking brake for an extended period, then the vehicle remains securely stopped, but gear backlash may occur in the transmission
Solution Approach 1:
The control device continuously monitors the brake release pressure and detects when the parking brake has been fully engaged. Upon detecting full engagement, it automatically deactivates the service brake, providing feedback-based control that prevents excessive concurrent operation and potential gear backlash.
Solution Approach 2:
The service brake operation duration is dynamically adjusted based on the actual engagement status of the parking brake. The control device extends or shortens the service brake activation period according to the detected brake release pressure, optimizing the transition between brakes to minimize transmission stress.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
A control system for a work vehicle includes: a negative-type parking brake device that starts operating in response to a parking brake instruction; an output device that outputs the parking brake instruction; a service brake device that operates in response to an operation of a brake pedal by an operator; and a brake control device that operates the service brake device regardless of a pedal operation by the operator when the parking brake instruction is output from the output device.