Engine Control Torque Shaping Transition
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Solution Overview
Problem
Existing engine control systems face conflicts between maintaining minimum idle speed and ensuring driving comfort, often resulting in compromised performance and comfort due to the lack of a continuous transition between idle control and torque shaping, and parameterization interdependence.
Innovation Solution
An engine control system that implements a continuous transition between idle control and torque shaping, using situation recognition to determine a weighting index for shaping the torque requirement, allowing for independent optimization of both controller performance and driving comfort by decoupling parameterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If torque shaping is completely switched off to prevent engine stalling, then engine reliability is improved, but driving comfort deteriorates
Solution Approach 1:
The patent applies dynamics by making the torque shaping continuously adaptive based on real-time engine operating conditions. Instead of a fixed switch-off threshold, the system dynamically adjusts the degree of torque shaping through a weighting factor that varies with engine speed, load, and other parameters, allowing smooth transition between comfort-oriented and safety-oriented control modes
Solution Approach 2:
The patent changes parameters by introducing a weighting factor that continuously varies between 0 and 1, modifying the torque requirement in a graded manner. This parameter change enables the system to balance between torque shaping (for comfort) and idle speed maintenance (for reliability) based on current operating conditions, rather than using binary on/off control
2Reliability
If torque conversion is strengthened in the near-idle range to prevent stalling, then engine reliability is improved, but oscillations in engine speed occur worsening control stability
Solution Approach 1:
The system dynamically adjusts the torque conversion strength based on real-time feedback from engine sensors. The weighting factor is continuously updated according to engine speed deviations, ensuring that torque conversion is applied smoothly and adaptively rather than as a fixed strong correction, thereby preventing oscillations while maintaining reliability
3Reliability
If idle speed control operates with high dynamics to counteract speed changes, then engine reliability is improved, but driver's desired torque is negatively influenced worsening driving comfort
Solution Approach 1:
The patent introduces a weighting factor parameter that continuously varies between 0 and 1, allowing the idle speed control to adaptively adjust its influence on the final torque requirement. When driver torque demand is high, the weighting factor reduces the idle control's impact, preserving driver intent while still maintaining engine stability through subtle adjustments
4Device complexity
If switching solution is used between idle control and torque shaping, then implementation simplicity is improved, but conflicts between idle speed control and driving comfort arise
Solution Approach 1:
The patent introduces a weighting factor as an intermediary element that mediates between idle speed control and torque shaping. This intermediary allows both control strategies to work simultaneously with varying degrees of influence, eliminating the need for abrupt switching while maintaining implementation feasibility through a straightforward calculation approach
Data Source
Figure 1
Figure 2a~2b
Figure 3
AI summary
The invention relates to an engine control, an engine control method and to a corresponding computer program. The engine control is designed to form the torque request of an idle speed control (MLL) as a function of a situation recognition (2).