Engine Shut-Off Valve Control for Rapid Stop Determination
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Solution Overview
Problem
Existing internal combustion engines face delays in stopping operations due to the need to determine if a shut-off valve is stuck open, which continues to supply fuel even after the engine is stopped, prolonging engine operation.
Innovation Solution
A controller that includes a pressure sensor and processing circuitry to quickly determine if shut-off valves are stuck open by monitoring fuel pressure changes, allowing immediate engine shutdown when certain conditions are met, such as high vehicle speed or engine rotation speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the determination process is executed after stopping operation to check if the shut-off valve is stuck open, then the reliability of fuel supply control is improved, but the engine stoppage time is extended
Solution Approach 1:
The determination process is executed before the engine stoppage is completed, rather than after. The controller determines whether the shut-off valve is stuck open during the deceleration phase (before complete stoppage) by monitoring fuel pressure changes, allowing the engine to be stopped immediately after determination without waiting for the valve status check to complete.
Solution Approach 2:
The patent skips the traditional sequence where determination occurs after stoppage. Instead, it rushes through the determination process during the transition phase before complete stoppage, using fuel pressure monitoring to quickly assess valve status and enable immediate engine shutdown without delay.
2Speed
If the determination process is executed immediately after stopping operation, then the response speed to stoppage is improved, but the accuracy of shut-off valve status detection deteriorates
Solution Approach 1:
The determination process is initiated in advance during the deceleration phase before the engine completely stops. The controller monitors fuel pressure changes from the moment the stoppage operation is detected, allowing sufficient time to assess valve status accuracy while maintaining rapid overall response.
Solution Approach 2:
The controller continuously monitors fuel pressure changes as feedback during the deceleration phase. By tracking the rate and pattern of pressure changes, the system can accurately determine valve status even during the dynamic transition period, distinguishing between normal pressure fluctuations and indications of a stuck-open valve.
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
Enables prompt engine shutdown in critical situations by bypassing the determination process when high speed or high rotation conditions are detected, ensuring rapid engine stoppage.
Implementation Method 1
a pressure sensor disposed in a portion of the fuel passage between the shut-off valve and the fuel injection valve and configured to detect a passage fuel pressure that is a pressure of the fuel in the portion
Data Source
AI summary
A controller is configured to control an internal combustion engine mounted on a vehicle. The controller includes processing circuitry. The processing circuitry outputs a valve closing signal to a shut-off valve, and executes, when a stopping operation of the internal combustion engine is performed, a determination process of determining whether the shut-off valve is stuck open based on a decrease amount of a passage fuel pressure. The controller does not execute the determination process when at least one of a condition that a vehicle speed is higher than a first determination speed and a condition that an engine rotation speed is higher than or equal to a second determination speed is met.