Engine Control System for Work Machine Hydraulic Load Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing engine control systems are ineffective in quickly suppressing engine rotation speed decreases caused by increased hydraulic loads, leading to potential engine stall and black smoke issues.
Innovation Solution
An engine control system that includes a rotation state amount specification unit and an injection amount determination unit, which determines the fuel injection amount based on the engine's rotation state to quickly counteract hydraulic load-induced speed drops, utilizing sensors and a processor to calculate and adjust the fuel injection amount dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the maximum fuel injection amount is increased when engine rotation speed decreases, then the occurrence of black smoke and engine stall is prevented, but the suppression of engine rotation speed decrease is delayed
Solution Approach 1:
The control device increases the maximum fuel injection amount before the engine rotation speed decreases significantly, based on predictive determination using a determination value. This preliminary action allows the fuel injection amount to be increased in advance, preventing both the delay in speed suppression and the occurrence of engine stall or black smoke.
Solution Approach 2:
The control device uses feedback from the determination value (which reflects engine state and load conditions) to dynamically adjust the maximum fuel injection amount. This feedback mechanism enables real-time optimization of fuel injection, ensuring that the injection amount is increased at the appropriate time to maintain engine rotation speed while preventing stall and black smoke.
2Stability of the object's composition
If control equivalent to normal state is performed until fuel injection amount exceeds maximum, then control stability is maintained, but response time to suppress rotation speed decrease is extended
Solution Approach 1:
The system performs preliminary determination of whether to increase the maximum fuel injection amount based on the determination value before the engine rotation speed actually decreases. This allows the control system to prepare the appropriate fuel injection amount in advance, reducing response time while maintaining control stability through systematic decision-making.
Solution Approach 2:
The control device dynamically adjusts the maximum fuel injection amount based on real-time determination values that reflect changing engine conditions. This dynamic adjustment allows the system to transition from normal control to increased fuel injection control smoothly and rapidly, reducing response time while maintaining overall control stability.
Data Source
AI summary
An engine control system controls a work machine including an engine, a fuel injection device that injects fuel into the engine, and a hydraulic pump that is driven by the engine. The rotation state amount specification unit specifies a rotation state amount related to rotation of the engine. The injection amount determination unit determines a fuel injection amount by the fuel injection device based on the rotation state amount.