Dynamic Torque Control Reducing Powertrain Oscillations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current torque control systems in vehicles, which use static torque ramps to mitigate powertrain oscillations, fail to optimize torque requests for various driving modes, leading to reduced vehicle performance and discomfort due to unnecessary torque limitations or insufficient oscillation reduction.
Innovation Solution
A dynamic torque control system that adjusts torque demand based on current and desired torque values, derivatives, and total delay time, ensuring optimal torque adjustment at the right time to minimize powertrain oscillations and enhance comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If static torque ramps are used to limit engine torque requests, then powertrain oscillations are reduced, but vehicle performance is unnecessarily reduced and driver comfort deteriorates due to overly conservative torque limitations
Solution Approach 1:
The patent implements dynamic torque ramps that adapt in real-time based on powertrain operating conditions, replacing static torque limitation strategies. The system continuously adjusts torque requests according to current engine speed, load, and oscillation characteristics, enabling optimal torque delivery that prevents oscillations while maintaining vehicle performance and driver intent across varying driving modes.
Solution Approach 2:
The system dynamically modifies torque ramp parameters including slope, magnitude, and duration based on real-time powertrain state. By changing these parameters adaptively rather than using fixed values, the system achieves effective oscillation suppression across different operating conditions without unnecessarily limiting vehicle performance or driver comfort.
2Device complexity
If static torque ramps are used to simplify control complexity, then device complexity is reduced, but adaptability to different driving modes deteriorates leading to suboptimal torque control
Solution Approach 1:
The control system transitions from static to dynamic torque ramp generation that automatically adapts to different driving modes, vehicle loads, and engine operating conditions. This dynamic approach maintains relatively simple control architecture while achieving high adaptability through real-time parameter adjustment based on sensor feedback and powertrain state.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor powertrain oscillations and operating conditions, using this information to continuously adjust torque ramp characteristics. This feedback-driven adaptation enables the control system to respond appropriately to varying driving modes without requiring complex pre-programmed strategies for each condition.
3Object-affected harmful factors
If torque ramps are applied to prevent powertrain oscillations, then rocking movements are reduced, but torque delivery timing is delayed causing loss of driver intent and vehicle responsiveness
Solution Approach 1:
The system applies preliminary torque ramp adjustments in anticipation of powertrain oscillations, modifying torque requests before oscillations fully develop. This proactive approach prevents rocking movements while minimizing torque delivery delay by preparing the torque profile in advance based on predicted powertrain response.
Solution Approach 2:
The dynamic torque ramp system continuously adapts ramp timing and magnitude based on real-time powertrain response characteristics, optimizing the balance between oscillation suppression and torque delivery speed. This dynamic adjustment reduces unnecessary torque delays while effectively preventing rocking movements.
Data Source
Figure 1
Figure 2
Figure 3~7
AI summary
The present invention relates to a method and a system for the control of a torque Tq demand requested from an engine in a vehicle, wherein the engine provides a dynamic torque Tq fw in response to said torque Tq demand . Control of the requested torque Tq demand is performed in such a way that the control provides a desired value Tq fw_req for the dynamic torque and/or a desired derivativeTq fw_req for the dynamic torque. This is achieved by basing the control on at least one current value Tq fw_pres for the dynamic torque, on one or several of the desired value Tq fw_req and the desired derivative Tq fw_req for the dynamic torque, and on a total delay time t delay-total elapsing from determination of at least one parameter value, to when a change of said dynamic torque Tq f w based on the determined at least one parameter value, has been effected.