Driveline Torque Transition Control for Impact Reduction
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Solution Overview
Problem
Existing engine control techniques fail to effectively minimize driveline system impact reverberation, leading to undesirable tactile and audible noises, vibration, and harshness due to abrupt torque reversals.
Innovation Solution
A control technique that extends the time of torque reversal by adjusting fueling rates and determining appropriate ramp rates to reduce driveline impact forces, using a controller connected to the engine and transmission to manage torque transitions during Tip-In and Tip-Out events without additional mechanical or electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If abrupt torque reversal is used to respond quickly to driver input, then engine responsiveness is improved, but driveline impact reverberation and vibration increase
Solution Approach 1:
The system dynamically adjusts the torque transition characteristics based on operating conditions. During tip-in events, the torque transition is controlled to pass through a reversal region at a reduced rate, while during tip-out events, the transition is extended over time. This dynamic adjustment resolves the contradiction by adapting the torque reversal behavior to different driving scenarios, reducing driveline impact while maintaining appropriate responsiveness.
Solution Approach 2:
The system changes key parameters including torque transition rate, fueling rate, and ramp rate selection based on detected torque reversal conditions. By modifying these parameters during torque transitions, the system reduces the abruptness of torque reversal, thereby minimizing driveline impact reverberation while still responding to driver input in a timely manner.
2Object-affected harmful factors
If torque transition time is extended to reduce impact forces, then driveline reverberation is reduced, but engine responsiveness deteriorates
Solution Approach 1:
The system implements dynamic control where the torque transition duration is adaptively adjusted based on the specific operating condition. During tip-in events, the transition passes through the reversal region quickly at a controlled reduced rate, while during tip-out events, the transition is extended. This dynamic approach ensures that driveline impact is reduced without unnecessarily prolonging torque transitions, thus maintaining engine responsiveness.
Solution Approach 2:
The system detects torque reversal conditions in advance and applies preliminary control actions by selecting appropriate ramp rates and adjusting fueling rates before the torque transition completes. This preliminary anti-action prevents excessive driveline impact forces from developing, allowing for faster overall response times while still protecting against harmful reverberation.
3Object-affected harmful factors
If fueling rate is adjusted to control torque transition, then torque reversal is smoothed, but fuel control complexity increases
Solution Approach 1:
The system uses feedback from torque sensors and operating condition detectors to continuously monitor torque transitions. Based on this feedback, the controller adjusts the fueling rate in real-time to smooth torque reversals. This feedback mechanism enables effective torque control without requiring complex mechanical modifications, as the control is achieved through intelligent fuel management based on sensed conditions.
Solution Approach 2:
The system replaces potential mechanical complexity with electronic control of the fueling rate. Instead of using mechanical devices to physically smooth torque transitions, the system uses the existing electronic fuel injection system to control torque by adjusting fuel delivery. This substitution maintains simplicity by utilizing existing electronic control infrastructure rather than adding mechanical complexity.
Data Source
AI summary
A method for driveline impact reverberation reduction including operating an engine coupled to a transmission; regulating operation of the engine with a controller to adjust fueling of the engine which includes providing a signal to the controller representative of a requested engine torque; determining a first fueling rate as a function of the signal and a set of preselected operating instructions; adjusting a set of engine operating parameters according to the first fueling rate; determining a second fueling rate as a function of the first fueling rate; and adjusting a set of engine operating conditions according to the second fueling rate.