Engine Torque Responsiveness During Active Fuel Management Transitions
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Solution Overview
Problem
Current active fuel management systems in automobile engines experience slow torque responsiveness during transitions out of fuel management modes, leading to undesirable driveline disturbances and reduced vehicle responsiveness to driver input.
Innovation Solution
A method that detects driver torque requests and modifies torque request signal ramp rates based on excess air pressure and engine manifold conditions, using sensors like accelerator pedal, vehicle speed, and engine speed sensors to enhance torque output responsiveness, and includes torque shaping and smoothing mechanisms to ensure smooth transitions during cylinder reactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If current engine controls for reactivation are designed to allow for smooth transitions out of active fuel management, then driveline disturbances are prevented, but vehicle torque responsiveness during pedal tip-ins becomes slow
Solution Approach 1:
The patent implements dynamic control of the torque request signal ramp rate based on real-time detection of driver torque requests. When a driver torque request is detected during active fuel management, the system modifies the ramp rate to increase torque output responsiveness, while still maintaining smooth transitions through controlled ramping. This dynamic adjustment allows the system to adapt between smooth operation and rapid response based on driving conditions.
Solution Approach 2:
The system changes the parameter of the torque request signal ramp rate based on detected driving conditions. By modifying this parameter in response to driver torque requests, the system achieves faster torque responsiveness when needed while preventing driveline disturbances through controlled ramping, thus resolving the contradiction between smooth transitions and rapid response.
2Speed
If torque request signal ramp rate is increased to improve torque responsiveness, then vehicle responsiveness to driver input improves, but driveline disturbances may increase
Solution Approach 1:
The system dynamically adjusts the torque request signal ramp rate based on detected driver torque requests and current engine operating conditions. This dynamic control allows the ramp rate to be increased for faster response when needed, while still being modulated to prevent excessive driveline disturbances, achieving a balance between responsiveness and smoothness.
Solution Approach 2:
The system uses feedback from driver torque request detection to modify the torque request signal ramp rate. This feedback mechanism allows the system to respond to actual driving conditions, increasing responsiveness when the driver requests torque while maintaining control to prevent driveline disturbances, thus resolving the contradiction.
Data Source
AI summary
A method of improving active fuel management reactivation torque responsiveness. The method includes detecting a driver torque request signal for increased torque output during active fuel management reactivation, modifying a torque request signal ramp rate based on excess air pressure available within an engine manifold during active fuel management, performing torque shaping on the driver torque request signal using the modified torque request signal ramp rate to obtain a shaped driver torque request signal, modifying manifold model torque estimation based on the excess air pressure available within the engine manifold during active fuel management reactivation, and modifying the smoothed driver torque request signal based on the modified manifold model to increase torque output responsiveness proportional to the driver torque request signal when exiting active fuel management.