Work Machine Engine Stop Control for Delayed Shutdown Override
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Solution Overview
Problem
Existing engine stop systems for work machines do not provide a configuration to suspend control during delayed engine stop, which is necessary to return to normal engine operation.
Innovation Solution
A stop system for work machine engines that includes an engine stop control unit for delayed stop control and an engine stop control suspension unit that can suspend or continue delayed stop control based on the lock state of the work equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If delayed stop control is performed to prevent engine shutdown until exhaust temperature decreases, then exhaust system temperature can be reduced safely, but the operator cannot immediately stop the engine when needed
Solution Approach 1:
The engine stop control system transitions from a static delayed stop mode to a dynamic state where the operator can override the delay by operating the work equipment. The system adapts its behavior based on operator input: if work equipment operation is detected during the delay period, the delayed stop control is canceled and the engine stops immediately, allowing the operator to maintain full control when needed.
Solution Approach 2:
The work equipment operation serves as an intermediary mechanism to communicate the operator's intent to cancel the delayed stop. By detecting operation of the work equipment, the system infers that the operator wishes to immediately stop the engine, using the work equipment as a mediator between the operator and the engine control system.
2Ease of operation
If the engine is stopped immediately upon stop instruction, then engine stop responsiveness is improved, but exhaust system temperature may be too high causing damage
Solution Approach 1:
The system performs preliminary action by delaying the engine stop until the exhaust system temperature decreases to a safe level. This preliminary cooling period prevents thermal damage to the exhaust system while still allowing for immediate stop if the operator needs to cancel the delayed stop by operating the work equipment.
Solution Approach 2:
The system changes the parameter of engine stop timing based on the exhaust system temperature parameter. When the temperature is high, the stop is delayed; when the temperature decreases to a safe threshold, the engine can be stopped. The operator can also change this behavior by operating the work equipment during the delay period.
3Temperature
If delayed stop control is implemented without suspension capability, then exhaust temperature safety is improved, but operational flexibility is reduced
Solution Approach 1:
The control system is made dynamic by allowing the operator to suspend or cancel the delayed stop control through work equipment operation. This creates adaptability where the system can switch between delayed stop mode for safety and immediate stop mode for operational flexibility, depending on operator needs.
Data Source
AI summary
A stop system for an engine of a work machine includes an engine stop control unit and an engine stop control suspension unit. The engine stop control unit, in a case in which there is a stop instruction that instructs to stop the engine of the work machine, performs delayed stop control to delay the stop of the engine until a predetermined condition is established, and then stops the engine. The engine stop control suspension unit, in a case in which there is a cancellation instruction to cancel the stop instruction, suspends the delayed stop control when work equipment of the work machine is in a locked state, and continues to perform the delayed stop control when the work equipment is in an unlocked state.