Engine Control Device for Hydrogen EGR Condensed Water Management
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Solution Overview
Problem
Internal combustion engines using gaseous fuels like hydrogen face increased cylinder temperatures during high-load operations, as the vaporization of gaseous fuels does not effectively suppress temperature rises, leading to potential pre-ignition issues.
Innovation Solution
An internal combustion engine control device that determines the generation of condensed water in the intake passage and adjusts its collection based on engine load, reducing condensed water collection during high-load operations to recirculate exhaust gas and introduce it into the cylinder, thereby suppressing temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If condensed water is collected in the exhaust gas recirculation passage, then the harmful effect of condensed water on engine components is reduced, but the temperature suppression effect in the cylinder during high-load operation is weakened
Solution Approach 1:
The control device dynamically adjusts the operation of the water collection valve based on engine operating conditions (load and temperature). During high-load operations, the valve is kept open to allow condensed water to return to the cylinder for cooling, while during normal operations, the valve closes to prevent water accumulation and protect components.
Solution Approach 2:
The system changes the operational state of the water collection valve from a static closed position to a dynamic controlled position based on engine parameters (load and temperature). This parameter-based control allows the system to optimize between component protection and temperature suppression depending on operating conditions.
2Reliability
If the water collection valve is kept closed, then condensed water accumulates in the passage protecting components, but cylinder temperature increases during high-load operation
Solution Approach 1:
The water collection valve transitions from a static closed state to a dynamically controlled state that opens during high-load operations. This dynamic adjustment allows condensed water to be released into the cylinder when needed for cooling while remaining closed during normal operations to protect components.
Solution Approach 2:
The control device uses feedback from engine load and temperature sensors to determine when to open or close the water collection valve. When high load and temperature conditions are detected, the valve opens to allow water return; otherwise, it remains closed to protect components.
3Object-generated harmful factors
If gaseous fuel is used, then emission performance is improved, but the temperature suppression effect through fuel vaporization is reduced
Solution Approach 1:
Condensed water from the exhaust gas recirculation passage serves as an intermediary cooling medium. Since gaseous fuel vaporization provides insufficient cooling, the condensed water acts as a substitute cooling agent that evaporates in the cylinder to suppress temperature rises during high-load operations.
Solution Approach 2:
The system utilizes the phase transition of condensed water from liquid to vapor during evaporation in the cylinder. This phase change absorbs heat and provides the necessary cooling effect that compensates for the reduced vaporization cooling from gaseous fuel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control device effectively suppresses cylinder temperature rises during high-load operations, reducing the likelihood of pre-ignition and maintaining engine performance by optimizing the recirculation of exhaust gas and condensed water.
Implementation Method 1
an EGR cooler configured to cool the EGR gas flowing through the EGR passage
Implementation Method 2
an increase in temperature in the cylinder can be suppressed as the liquid fuel is vaporized in the cylinder
Implementation Method 3
an exhaust gas recirculation device configured to recirculate, into the intake passage, part of the exhaust gas flowing through the exhaust passage
Data Source
AI summary
When EGR gases are introduced into the intake passage through EGR passage, the control device determines whether or not the condensed water is generated in the merging portion of the intake passage, which is the portion to which EGR passage is connected. The control device determines whether or not the internal combustion engine is in a high-load operation based on the engine speed and the engine torque. The control device determines that the condensed water is generated in the merging portion of the intake passage, and reduces the amount of the condensed water collected by the collection device when the internal combustion engine is determined to be in a high-load operation.