Hydrogen Engine Controller with Combustion Feedback Fuel Limiting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hydrogen engines with forced induction devices are prone to anomalies such as wastegate valve failures or exhaust gas leaks, leading to insufficient air supply and increased likelihood of anomaly combustion like knocking and pre-ignition, which existing controllers fail to adequately address.
Innovation Solution
A hydrogen engine controller that includes processing circuitry to repeatedly set a target fuel injection amount based on engine torque, detect anomaly combustion, determine intake system anomalies, and limit fuel injection when necessary to maintain a lean air-fuel ratio and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the target fuel injection amount is set proportionally to the target engine torque, then the engine torque output is improved, but the risk of anomaly combustion increases when air supply is insufficient
Solution Approach 1:
The controller monitors combustion state to detect anomaly combustion and uses this feedback to adjust the target fuel injection amount. When anomaly combustion is detected, the controller limits the fuel injection amount to prevent further anomaly combustion, creating a closed-loop control system that adapts to actual combustion conditions.
Solution Approach 2:
The target fuel injection amount is dynamically adjusted based on real-time detection of anomaly combustion. The controller transitions from a static proportional relationship between torque and fuel injection to a dynamic control strategy that modifies fuel injection limits when anomaly combustion occurs, allowing the system to adapt to changing engine conditions.
2Reliability
If the wastegate valve cannot be closed or exhaust gas leaks, then the forced induction device cannot rotate the turbine wheel sufficiently, but the existing controller cannot detect this anomaly
Solution Approach 1:
The controller uses feedback from combustion state monitoring to indirectly detect intake system anomalies. By detecting anomaly combustion patterns that result from insufficient air supply, the system can infer wastegate valve failures or exhaust gas leaks without requiring direct sensors on these components.
Solution Approach 2:
The combustion state serves as an intermediary indicator for detecting intake system anomalies. Instead of directly monitoring the wastegate valve or turbine wheel rotation, the system uses combustion characteristics as a mediator to infer the health of the forced induction system.
3Object-affected harmful factors
If the air-fuel ratio becomes rich due to insufficient air supply, then anomaly combustion such as knocking and pre-ignition is more likely to occur, but the controller lacks the capability to prevent this
Solution Approach 1:
The controller continuously monitors combustion state and uses this feedback to adjust fuel injection amounts. When anomaly combustion is detected indicating a rich air-fuel ratio, the system responds by limiting further fuel injection to maintain a leaner mixture and prevent anomaly combustion.
Solution Approach 2:
The controller changes the fuel injection parameter (target fuel injection amount) in response to detected anomaly combustion. By limiting the fuel injection amount when anomaly combustion occurs, the system alters the air-fuel ratio parameter to prevent further anomaly combustion events.
Data Source
AI summary
The hydrogen engine includes a forced induction device and a plurality of cylinders. A controller for a hydrogen engine repeatedly sets a target fuel injection amount based on a target engine torque. The controller repeatedly determines whether anomaly combustion, which is an anomaly in which combustion occurs at a timing different from the ignition timing, is occurring. The controller executes the intake system anomaly determination process on condition that it is determined that anomaly combustion has occurred in two or more of the plurality of cylinders. The intake system anomaly determination process is a process of determining whether an intake system anomaly, which is an anomaly in which the amount of air supplied to the plurality of cylinders decreases, has occurred. The controller limits the target fuel injection amount when determining that the intake system anomaly has occurred.