Work Vehicle Engine Stop Control for Brake Failure
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Solution Overview
Problem
Existing work vehicles face a risk of continuous travel and potential collisions due to the lack of automatic engine shutdown in case of a brake mechanism defect, especially in autonomous operations where manual intervention is not possible.
Innovation Solution
A work vehicle equipped with a power transmission system that includes a clutch member and a braking device, where the engine control unit stops the engine if the brake determination unit determines that the vehicle is not braked, ensuring safe stopping even with a defective brake mechanism, and the vehicle can transition to autonomous control and four-wheels driving for enhanced braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the brake mechanism is operated to stop the vehicle, then the vehicle can be stopped, but if the brake mechanism has a defect, the vehicle cannot be stopped safely
Solution Approach 1:
The engine control unit is configured to stop the engine when a brake defect is detected, providing a backup safety mechanism before a collision can occur. This prior cushioning approach ensures that even if the brake mechanism fails, the vehicle will not continue traveling due to engine power loss.
Solution Approach 2:
The brake determination unit acts as an intermediary between the brake operation and engine control. It monitors whether the brake operation is effective and communicates this information to the engine control unit, which then decides whether to stop the engine, creating a safety intermediary layer.
2Reliability
If the engine control unit stops the engine when brake defect is detected, then the vehicle stops safely, but the vehicle cannot complete its intended work
Solution Approach 1:
The system provides beforehand cushioning by stopping the engine only when necessary for safety, allowing the vehicle to complete its work under normal conditions while ensuring safety when brake defects are detected.
3Reliability
If the clutch member is moved to the block position to block power transmission, then the vehicle can be stopped, but if the brake mechanism is defective, the vehicle may still travel
Solution Approach 1:
The brake determination unit serves as an intermediary that monitors the effectiveness of the clutch member's block position and brake operation. When it detects that the vehicle is not braked despite these actions, it signals the engine control unit to stop the engine, providing an additional safety layer.
4Productivity
If the vehicle operates in autonomous mode, then productivity is improved, but the risk of uncontrolled travel increases when brake defects occur
Solution Approach 1:
The autonomous vehicle performs self-service by automatically detecting brake defects and stopping the engine without human intervention. The engine control unit autonomously decides to stop the engine when a brake defect is detected, ensuring safety even when no operator is present.
Solution Approach 2:
The brake determination unit provides feedback to the engine control unit about the effectiveness of brake operations. This feedback loop enables the autonomous vehicle to detect brake defects and respond appropriately by stopping the engine, maintaining safety during autonomous operation.
Data Source
AI summary
According to one embodiment, a work vehicle includes: a traveling vehicle body; an engine supported by the traveling vehicle body; a power transmission device which transmits power of the engine to a wheel, and has a clutch member which is supported to be movable between a transmission position and a block position; a braking device which brakes the wheel; a brake control unit which allows the clutch member to move to the block position and the braking device to operate in a case where the traveling vehicle body is braked; a brake determination unit which determine whether the traveling vehicle body is braked in a case where the braking device is operated; and an engine control unit which stops the engine in a case where the traveling vehicle body is not braked on the basis of a determination result of the brake determination unit.