Engine Control Apparatus Managing Fuel Vaporization Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control apparatuses for internal combustion engines face challenges in achieving required torque and preventing accidental fires due to errors in final injection termination timing, particularly when the timing approaches the end of the effective injection period.
Innovation Solution
A control apparatus that includes a calculation part to determine a second timing advanced from the ignition timing by the time required for fuel vaporization, and a control part that adjusts the injector or ignition device to ensure sufficient vaporization time, thereby securing the required fuel injection amount even if the final injection termination timing occurs after the first or second timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the final injection termination timing is set close to the ignition timing to maximize fuel injection amount, then the fuel injection amount is increased, but the risk of accidental fire increases and vaporization time may be insufficient
Solution Approach 1:
The system performs preliminary determination of whether the final injection termination timing exceeds the predetermined timing before ignition occurs. Based on this determination, it preemptively adjusts either the injection timing or ignition timing to prevent accidental fire while ensuring sufficient vaporization time, thus resolving the contradiction between maximizing fuel injection amount and preventing accidental fire
Solution Approach 2:
The system dynamically changes the parameters of injection timing or ignition timing based on the determined relationship between final injection termination timing and predetermined timing. By adjusting these temporal parameters, the system ensures adequate vaporization time and prevents accidental fire while maintaining required fuel injection amounts
2Reliability
If the final injection termination timing is advanced to prevent accidental fire, then the safety is improved, but the fuel injection amount may become insufficient to achieve required torque
Solution Approach 1:
The system performs preliminary determination of the relationship between final injection termination timing and predetermined timing before ignition. Based on this determination, it preemptively adjusts injection or ignition timing to prevent accidental fire while compensating for any loss in fuel injection amount to maintain required torque
Solution Approach 2:
The system uses feedback from the determination of timing relationships to adjust injection or ignition timing. This closed-loop control ensures that safety requirements are met while maintaining sufficient fuel injection amounts for required torque output
3Duration of action of moving object
If the injection timing is adjusted to secure vaporization time, then the vaporization time is sufficient, but the fuel injection amount required for torque may not be achieved
Solution Approach 1:
The system dynamically adjusts the parameters of injection timing or ignition timing based on the determined relationship between final injection termination timing and predetermined timing. By optimizing these temporal parameters, the system ensures adequate vaporization time while maintaining sufficient fuel injection amounts for required torque
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
This solution ensures the achievement of required torque and avoidance of accidental fires by securing sufficient time for fuel vaporization, even when errors occur in the final injection termination timing, by retarding the ignition timing or adjusting injection intervals.
Implementation Method 1
time required for vaporization of fuel injected into a cylinder
Data Source
AI summary
Provided is a control apparatus for an internal combustion engine which can achieve required torque and avoid the risk of an accidental fire even in the case where an error occurs in final injection termination timing. A microcomputer calculates T902 which has been further advanced from T106 which precedes ignition timing by time required for vaporization of fuel injected into a cylinder of an internal combustion engine. The microcomputer determines whether final injection termination timing (T903) comes after T106 or T902. When it has been determined that final injection termination timing (T1204) comes after T106 or T902, the microcomputer controls an injector or an ignition device so as to secure time for vaporization of the fuel injected into the cylinder of the internal combustion engine while satisfying a fuel injection amount required in one combustion cycle.