Engine Control Device Cylinder Injection Homogeneity
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Solution Overview
Problem
Existing electronic control devices for internal combustion engines in vehicles primarily focus on optimizing smooth engine running through cylinder equalization during lean operation but fail to ensure homogeneous operation and maintain emission limits effectively, especially when dealing with irregular running conditions and injector aging.
Innovation Solution
An electronic control device that adjusts the injection quantity of cylinders associated with a lambda probe by differential adjustment values to achieve a predetermined lambda value of approximately 1, ensuring homogeneous operation by adjusting each cylinder individually and storing correction values based on empirical irregular running differential values, which can be adapted to varying operating points and fault conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cylinder equalization is performed based on total torque during lean operation, then smooth engine running is optimized, but homogeneous operation and emission limits cannot be reliably maintained
Solution Approach 1:
The control system segments the engine operation into individual cylinder control based on lambda probe signals. Each cylinder is independently monitored and adjusted using its specific irregular running values, allowing precise control of air-fuel mixture in each cylinder rather than treating the engine as a single unit.
Solution Approach 2:
The system continuously monitors lambda values from lambda probes and uses this feedback to dynamically adjust injection quantities. The control unit compares actual lambda values with target values and modifies injection parameters in real-time to maintain homogeneous operation and meet emission limits.
2Reliability
If injection quantity is adjusted individually for each cylinder to achieve homogeneous operation, then emission limits are maintained, but control complexity increases
Solution Approach 1:
The control unit performs multiple functions using a unified approach: it determines irregular running values, calculates differential adjustment values, modifies injection quantities, and stores correction values all through the same control architecture. This multi-functionality reduces overall system complexity despite individual cylinder control.
Solution Approach 2:
The system pre-determines irregular running differential values under fault-free conditions and stores them as correction values. These pre-calculated values are then applied during actual operation to adjust injection quantities, reducing the need for complex real-time calculations and simplifying the control mechanism.
3Manufacturing precision
If differential adjustment values are determined empirically under fault-free conditions, then correction values can be stored and applied, but the system cannot immediately respond to varying operating points and fault conditions
Solution Approach 1:
The control system dynamically adapts the pre-stored correction values to current operating conditions. The control unit modifies the application of correction values based on actual lambda values, irregular running conditions, and operating points, enabling the system to respond to varying conditions while maintaining the benefits of empirically determined values.
Data Source
AI summary
An electronic control device according to the invention is disclosed for controlling the internal combustion engine in a motor vehicle, for fault recognition with an irregular running determination unit and with an injection quantity correction unit, a defined group of cylinders being associated with a lambda probe, the injection quantity of a cylinder to be investigated of the defined group is adjusted in the direction of lean by a differential adjustment value associated with an irregular running differential value, and the injection value of at least one of the remaining cylinders, which are associated with the same lambda probe, is correspondingly adjusted in the direction of rich, so that in total a predetermined lambda value of this group of at least approximately 1 is reached. Homogeneous operation is thus ensured. The differential adjustment values may, for example, relate to the injection quantity itself, the injector stroke or the injection time. In this manner, a differential adjustment value individual to the cylinder is adjusted for each cylinder of the defined group. Correction values individual to the cylinder are then determined in that the differential adjustment values individual to the cylinder are related to one another.