Diesel Injection Control Region Division for Torque Stability
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Solution Overview
Problem
Existing exhaust gas purification systems face challenges in simplifying data control for multi-injection systems in diesel engines, leading to increased complexity and torque shocks during forced regeneration control, particularly in high-load operation states.
Innovation Solution
A control method that divides the operation state into multi-injection, transition, and normal injection regions based on engine load and speed, using interpolation to smoothly switch from multi-injection to normal injection, reducing the number of data maps and meshes required for control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multi-injection control is used to raise exhaust gas temperature for forced regeneration, then the oxidation catalyst activation temperature is achieved, but the number of data maps and meshes for injection control becomes extremely large
Solution Approach 1:
The operation state space is segmented into three distinct regions: multi-injection control region, transition region, and normal injection control region. This segmentation allows different control strategies to be applied in different operating conditions, reducing the overall data complexity while maintaining effective temperature control for forced regeneration.
Solution Approach 2:
The system dynamically switches between multi-injection control and normal injection control based on the current operation state. By making the control strategy adaptive rather than static, the system can simplify data requirements in high-load states where multi-injection is not needed, thus reducing the number of data maps required.
2Device complexity
If multi-injection control is switched to normal injection control in high-load operation state, then the number of data maps is reduced, but torque shock occurs during transition
Solution Approach 1:
A transition region is introduced as an intermediary between the multi-injection control region and the normal injection control region. In this transition region, the system uses interpolated injection control data to smoothly bridge the two control modes, preventing abrupt changes in injection strategy that would cause torque shock while still reducing data complexity.
Solution Approach 2:
The system changes the control parameters (injection timing, injection amount) gradually through interpolation in the transition region rather than abruptly switching between control modes. This parameter transition approach maintains torque stability while enabling the reduction of data maps in high-load operation states.
3Loss of time
If the number of meshes and data maps is decreased to simplify control, then calculation time and preparation processes are reduced, but control precision may be compromised
Solution Approach 1:
Instead of creating comprehensive data maps for all possible operating conditions, the system applies multi-injection control only when necessary (in low-load states requiring temperature rise) and uses normal injection control for high-load states. This partial application of complex control only where needed reduces calculation time while maintaining sufficient precision for each operating regime.
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 approach reduces the complexity of data control and prevents torque shocks by allowing seamless transition between injection modes, thereby improving controllability and simplifying the number of data maps needed for environmental corrections.
Implementation Method 1
HC (hydrocarbon) supplied into the exhaust gas by post injection (post-injection) in a cylinder (in-cylinder) and the like is burned by the oxidation catalyst arranged on the upstream side of the filter or the oxidation catalyst carried by the filter
Implementation Method 2
HC (hydrocarbon) supplied into the exhaust gas by post injection (post-injection) in a cylinder (in-cylinder) and the like is burned by the oxidation catalyst
Implementation Method 3
the oxidation reaction is not promoted, and oxidation of the PM and regeneration of the filter become difficult
Data Source
AI summary
In forced regeneration control of an exhaust gas purification device a number of data for injection control, such as a number of meshes of a data map and a number of data maps for multi injection control, is decreased while occurrence of torque shock, which is a rapid fluctuation of a generated torque, is avoided. In this forced regeneration control, when an operation state of an internal combustion engine is a high-load operation state, the normal injection control by stopping the multi injection is carried out and, according to a rotation speed and a load of the internal combustion engine, a region for control is divided into a multi-injection control region, a transition region, and a normal injection control region. In the transition region, data for injection control obtained by interpolation of data for injection control on the multi-injection control region side and data for injection control on the normal injection control region side is used.