Torque Management During Deceleration Fuel Cut-Off
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Solution Overview
Problem
During deceleration with injection cut-off, existing engine torque management systems fail to accurately follow the driver's desired torque, leading to unwanted torque jumps and jerking in the traction chain upon re-acceleration, due to limited ignition advance settings.
Innovation Solution
A method that switches the engine torque structure to an unbound operating mode upon detecting deceleration with injection cut-off, allowing ignition advance to vary between minimum and maximum settings, using a hysteresis function to detect injection cut-off periods and ensure the target torque is followed during subsequent acceleration, thereby applying an agreeable torque after releasing the accelerator pedal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine operates at optimum ignition advance during deceleration with injection cut-off, then engine efficiency is maximized, but unwanted torque jumps occur during subsequent acceleration
Solution Approach 1:
The ignition advance is made dynamic by switching between two operating modes: looped mode (optimum advance for efficiency) and unbound mode (restricted advance range to prevent torque jumps). The system dynamically adapts the ignition advance strategy based on driver intent detection, resolving the contradiction between efficiency and torque smoothness.
Solution Approach 2:
The patent creates a virtual model of driver intent by comparing setpoint torque with engine loss torque using hysteresis thresholds. This virtual detection mechanism copies the driver's unwinding request without physical sensors, enabling the system to anticipate torque jumps and prevent them by switching to unbound mode.
2Reliability
If ignition advance is limited to prevent knocking, then engine reliability is improved, but maximum torque output is reduced
Solution Approach 1:
The system dynamically adjusts the ignition advance strategy based on operating conditions. During normal operation, the engine operates at optimum advance for maximum torque. During detected unwinding requests, the system switches to unbound mode with restricted advance range, temporarily accepting reduced torque to prevent knocking and ensure reliability.
Solution Approach 2:
The patent changes the ignition advance parameter range based on operational context. In looped mode, the full advance range including optimum advance is available for maximum power. In unbound mode, the advance is constrained to a narrower range that prevents knocking, thus adapting the parameter to balance power and reliability.
3Use of energy by moving object
If the torque structure operates in looped mode during deceleration, then engine efficiency is maximized, but driver intent cannot be properly followed
Solution Approach 1:
The system implements feedback by continuously monitoring the difference between setpoint torque and engine loss torque. When this difference falls within hysteresis thresholds, the system detects driver unwinding intent and provides feedback by switching to unbound mode, ensuring the torque structure adapts to driver intent while maintaining efficiency during normal operation.
Solution Approach 2:
The operating mode dynamically switches between looped and unbound based on real-time detection of driver intent. This dynamic adaptation allows the system to maintain高效率 during normal deceleration while becoming versatile enough to follow driver intent when unwinding requests are detected.
4Ease of operation
If injection is not cut off during deceleration, then torque can be smoothly controlled, but fuel consumption increases
Solution Approach 1:
The system dynamically manages injection based on detected driver intent. During normal deceleration, injection is cut off to save fuel. When unwinding intent is detected, the system switches to unbound mode that allows smooth torque control without injection, thus achieving both fuel savings and torque smoothness through dynamic mode switching.
Solution Approach 2:
The injection parameter is changed from continuous operation to cut-off based on operational mode. The patent changes the fuel injection state (on/off) according to the detected driver intent and operating conditions, reducing fuel consumption during deceleration while maintaining the ability to provide smooth torque when needed.
Data Source
AI summary
The invention relates mainly to a method for managing a torque of a controlled-ignition combustion engine using a torque structure, characterized in that with the combustion engine operating on an optimal ignition advance when following a reference torque (Cc) in a looped-back mode of operation of the torque structure, it comprises the step of switching the torque structure into a non-looped mode of operation following detection of deceleration with the injection to the combustion engine cut off so that the ignition advances calculated during a period for which injection is cut off are comprised between minimum and maximum ignition advances so that the reference torque (Cc) can be followed during the subsequent acceleration.