Automatic Parking Brake Control for Work Vehicles
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Solution Overview
Problem
Work vehicles, such as loaders and excavators, face the risk of unintended rolling when the driver leaves the vehicle, especially on uneven terrain, due to the lack of automatic engagement of the parking brake, which can lead to accidents as the engine's vibrations may cause the vehicle to start moving over time, especially in hydrostatically driven systems.
Innovation Solution
A braking system with a brake control that automatically activates the parking brake device based on predefined conditions, including inactivity of the accelerator pedal, neutral direction switch, zero speed, activation of the service brake, and absence of the driver from the seat, to prevent the vehicle from rolling away without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking brake requires manual operation by the driver, then the driver has control over brake activation, but the vehicle may roll away unintentionally when the driver leaves the vehicle
Solution Approach 1:
The brake control system automatically monitors vehicle conditions (speed, accelerator pedal position, direction switch position) and activates the parking brake without requiring manual intervention from the driver. The system serves itself by detecting when the vehicle is stationary and the driver is absent, then autonomously applying the brake to prevent unintended rolling.
Solution Approach 2:
The brake control continuously receives feedback from sensors monitoring vehicle speed, accelerator pedal position, and direction switch position. Based on this feedback, the control system determines when to activate the parking brake automatically, creating a closed-loop control system that responds to real-time vehicle conditions.
2Productivity
If the driver leaves the vehicle with the engine running, then the driver can perform work activities, but the vehicle may start rolling due to engine vibrations or hydraulic motor braking torque
Solution Approach 1:
The brake control system activates the parking brake in advance before the driver completely leaves the vehicle, based on detecting that the driver has been absent for a predetermined period. This preliminary action ensures the vehicle is secured against rolling before the driver moves away to perform work activities.
Solution Approach 2:
The system automatically monitors whether the driver is present or absent and autonomously activates the parking brake when the driver leaves, without requiring the driver to manually operate the brake. This self-service capability allows the driver to freely perform work activities while the system ensures vehicle stability.
3Object-affected harmful factors
If the parking brake is not applied when the driver leaves, then the vehicle operation is simple, but the surrounding area is endangered by unintended vehicle movement
Solution Approach 1:
The brake control system uses feedback from sensors to monitor vehicle speed, accelerator pedal position, and direction switch position. When the feedback indicates the vehicle is stationary and the driver is absent, the system automatically activates the parking brake to prevent harmful unintended movement, thereby protecting the surrounding area.
Solution Approach 2:
The automatic brake control system protects the surrounding area by autonomously detecting when the driver leaves and activating the parking brake without manual intervention. This self-protective capability eliminates the need for the driver to remember to apply the brake, thereby preventing potential hazards to the surrounding environment.
Data Source
Figure 1
Figure 2
AI summary
A work vehicle is specified with a braking system, with an engine (1) whose speed can be changed via an accelerator pedal (2), a parking brake device (8) and with a brake control (10) for actuating the parking brake device (8).The brake control (10) is designed to automatically activate the parking brake device (8) when at least one of the following conditions is met: - the accelerator pedal (2) is not actuated for a predetermined period of inactivity and the vehicle's speed is below a predetermined speed limit; - a direction switch (5) is in the "Neutral" position and the vehicle's speed is below a predetermined speed limit; - the vehicle speed is zero and subsequently increases without the accelerator pedal (2) being actuated; - the vehicle speed is zero and a service brake (6) is activated by a driver; - the vehicle speed is zero and the driver is not present in a driver's seat (16).