Engine Timing Correction for High Speed Gradient Protection
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Solution Overview
Problem
Existing engine control systems fail to accurately account for rapid changes in engine speed during high-speed gradients, leading to premature ignition or injection events that cause peak pressure surges and potential component damage.
Innovation Solution
A method that adjusts ignition and injection timing by incorporating a characteristic map that considers engine speed, load point, boost pressure, and other parameters, using a correction value to maintain the target angle and prevent pressure peaks by delaying ignition or reducing fuel pressure when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ignition and injection timing is determined based on current rotational speed at setting time, then the control system responds quickly to speed changes, but premature ignition events occur during high speed gradients causing peak pressure surges
Solution Approach 1:
The control system determines the speed gradient by comparing current rotational speed with previously measured speeds before the setting time. This preliminary speed gradient determination allows the system to predict and compensate for upcoming speed changes, adjusting ignition and injection timing in advance to prevent premature combustion events and peak pressure surges.
Solution Approach 2:
The patent applies a correction value derived from the speed gradient to cushion against premature ignition events. By calculating the speed gradient beforehand and applying compensatory timing adjustments, the system prevents the harmful effects of peak pressure surges before they occur, rather than reacting after damage has been caused.
2Productivity
If ignition timing is advanced to maintain target angle during speed changes, then combustion efficiency improves, but peak pressure exceedances occur causing component damage
Solution Approach 1:
The patent dynamically changes the ignition and injection timing parameters based on the calculated speed gradient. When a high speed gradient is detected, the system adjusts the timing parameters to delay ignition and injection events, preventing peak pressure exceedances while maintaining optimal combustion efficiency under normal operating conditions.
Solution Approach 2:
The control system transitions from static timing determination to dynamic timing adjustment by continuously monitoring speed gradients. This dynamic approach allows the system to adapt ignition and injection timing in real-time based on actual engine conditions, optimizing both combustion efficiency and pressure control.
3Reliability
If speed gradient monitoring is implemented to prevent knocking, then component reliability improves, but device complexity increases due to additional monitoring requirements
Solution Approach 1:
The control unit utilizes its existing speed measurement capabilities to determine the speed gradient by comparing current speed with previously stored speed values. This self-service approach allows the system to implement knock prevention and peak pressure protection without requiring external or additional specialized sensors, thereby minimizing the increase in device complexity.
Solution Approach 2:
The existing rotational speed measurement system serves multiple functions: it provides both the current speed value for timing determination and the historical speed data needed for gradient calculation. This multi-functionality allows the control unit to implement comprehensive protection against both knocking and peak pressure surges using a single integrated system.
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
Effectively prevents peak pressure exceedances by ensuring precise ignition and injection timing, even during rapid speed changes, thereby reducing the risk of component damage.
Implementation Method 1
determining a speed gradient on the basis of the rotational speed and a previously measured rotational speed
Implementation Method 2
a correction value is provided... which is added to a period determined in this way... thereby delaying the ignition and/or injection timing
Data Source
Figure 1~2
AI summary
The invention relates to a method for operating an internal combustion engine, in particular a motor vehicle, in which fuel is ignited and/or injected into a combustion chamber of one of several cylinders (Zn) at a specific time (ttoll) depending on a predetermined target angle (phisoll) of a rotating component of the internal combustion engine, which corresponds to the crank angle (KW) of a crankshaft of the internal combustion engine. The ignition and/or injection time (tsoll) is determined at a latest setting time (tvor) with knowledge of the target angle (phivor) and the current rotational speed (rpmvor) of one of the several cylinders (Zn) at the setting time (tvor). It is provided that at the latest setting time (tvor), a decision is made...Whether a change in rotational speed occurring after the latest setting time (tbefore) and the ignition and/or injection time (tset) leads to a shift in the ignition and/or injection time (tset) by monitoring the rotational speed (rpmbefore-1) of at least one of the several cylinders (Zn) preceding the one cylinder under consideration (Zn) in the firing order at a time (tpre-1) prior to the latest setting time (tbefore), wherein exceeding a predefinable rotational speed gradient (Δrpm) between the times between (tpre) and (tpre-1) leads to the activation of a protective function, in which, at least depending on the determined rotational speed gradient (Δrpm), a correction of the ignition and/or injection time (tset) set without activation is made by setting a corrected ignition and/or injection time. (tsoll) is doneso that, despite the change in engine speed, the specified target angle (phisolt) is maintained at the corrected ignition and/or injection timing (tsoll').