Injector Controller With Asymmetric Torque Correction
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Solution Overview
Problem
In internal combustion engines with multiple cylinders, variations in air-fuel ratios between cylinders can lead to significant torque differences, causing fluctuations in engine torque and potentially unstable combustion states.
Innovation Solution
A controller for injectors that adjusts fuel injection amounts based on a correspondence between torque differences and injection correction values, using correction information to either increase or decrease the fuel injection amount in each cylinder to stabilize torque and combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the correction amount of the supplied fuel is uniformly increased for all cylinders in accordance with the degree of deviation of the air-fuel ratio, then the air-fuel ratio can be corrected, but the torque may suddenly change and combustion state may become unstable
Solution Approach 1:
The patent applies parameter changes by differentiating the correction amounts based on the direction of torque deviation. When individual cylinder torque is greater than all-cylinder mean torque, a first correction amount is applied; when it is less, a second correction amount is applied. This asymmetric parameter adjustment resolves the contradiction by preventing sudden torque changes while maintaining air-fuel ratio correction precision.
Solution Approach 2:
The patent implements dynamics by making the correction amount adaptive rather than fixed. The correction system dynamically adjusts fuel supply based on real-time torque differences, switching between different correction amounts depending on whether the cylinder torque is above or below the mean. This dynamic approach maintains combustion stability while achieving precise air-fuel ratio control.
2Reliability
If the fuel injection amount is corrected to eliminate torque difference between cylinders, then torque fluctuations can be reduced, but the system complexity increases due to continuous monitoring and adjustment
Solution Approach 1:
The patent implements feedback control by continuously monitoring individual cylinder torque and comparing it with all-cylinder mean torque. The correction amount determination unit uses this feedback to automatically adjust fuel injection amounts, eliminating torque differences while maintaining manageable system complexity through automated closed-loop control.
Solution Approach 2:
The control system performs self-service by automatically determining and applying correction amounts based on detected torque differences. The system monitors its own performance and self-adjusts fuel injection without external intervention, achieving torque stabilization while keeping the control architecture relatively simple through autonomous operation.
Data Source
AI summary
A controller for injectors is provided. A torque difference is a difference between an individual cylinder torque and an all-cylinder mean torque. Correction information indicates a correspondence relationship between the torque difference and an injection correction value. In the correction information, the injection correction value for a case in which the individual cylinder torque is greater than the all-cylinder mean torque indicates a decrease correction. The injection correction value for a case in which the individual cylinder torque is less than the all-cylinder mean torque indicates an increase correction. When the absolute value of the torque difference during the increase correction is equal to the absolute value of the torque difference during the decrease correction, a correction amount of the increase correction is greater than a correction amount of the decrease correction.