Engine Injection Timing Conflict Resolution
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Solution Overview
Problem
Internal combustion engines face conflicts in actuating multiple injection valves due to temporal overlapping of injection cycles, particularly when late partial injections are required for exhaust-gas aftertreatment systems, leading to potential power losses and increased pollutant emissions.
Innovation Solution
A method and device that utilize a control device with an output stage to manage injection cycles by determining working injections and late injections in relation to the crankshaft rotational angle, allocating a setpoint crankshaft angle range for late injections within the injection cycle of subsequent cylinders, ensuring conflict-free actuation and optimizing pollutant emission control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If late partial injections are performed for exhaust-gas aftertreatment system regeneration, then the temperature in the exhaust-gas aftertreatment system is increased, but temporal overlapping of injection cycles occurs leading to actuation conflicts
Solution Approach 1:
The patent applies dynamics by making the injection timing flexible and adaptable. The control device dynamically adjusts the injection timing of late partial injections based on real-time detection of output stage availability. Instead of fixed timing, the system continuously monitors and adapts injection schedules to avoid conflicts, allowing the injection system to respond dynamically to changing operational conditions while ensuring reliable actuation.
Solution Approach 2:
The patent implements feedback by detecting whether the output stage is available at the desired injection timing and using this information to adjust subsequent injection commands. The control device monitors the actuation status and timing conflicts, then feeds this information back to modify injection scheduling, ensuring that late partial injections for aftertreatment regeneration are performed only when the output stage is available, thus preventing actuation conflicts.
2Device complexity
If multiple injection valves are actuated simultaneously using a common output stage, then device complexity is reduced, but temporal overlapping leads to actuation conflicts and power losses
Solution Approach 1:
The patent introduces an intermediary control device that mediates between the injection control signals and the common output stage. This intermediary layer detects timing conflicts before they occur and adjusts injection commands to prevent simultaneous actuation requests. By inserting this intelligent control layer, the system maintains the simplicity of a common output stage while eliminating the energy losses associated with actuation conflicts and failed injections.
3Adaptability or versatility
If late injections are scheduled within the injection cycle of subsequent cylinders, then exhaust-gas aftertreatment regeneration is enabled, but injection cycle conflicts arise
Solution Approach 1:
The patent applies preliminary action by detecting and reserving output stage availability in advance before scheduling late partial injections. The control device proactively identifies time windows where the output stage is free and schedules regeneration injections within these pre-validated time slots. This preliminary planning ensures that late injections are precisely timed to avoid conflicts with subsequent cylinder injection cycles, maintaining both flexibility and precision.
Data Source
AI summary
In a method and the corresponding apparatus for operating an internal combustion engine with a plurality of cylinders (Z1 to Z4) which are assigned in each case one injection valve (18) for metering in fuel, a control apparatus (25) is provided with in each case one output stage (25a) for actuating the injection valves (18) of the plurality of cylinders. Here, first of all work injection operations (P0 to P4) are determined for a cylinder (CYL_i) with the duration and positioning in relation to the crankshaft rotary angle. Following this, late injection operations (P5), which are required in certain operating modes, for the preceding cylinder (CYL_i−1) in the ignition sequence are arranged in a setpoint crankshaft angular range (SB) in such a way that no temporal overlaps occur between individual work and late injection operations.