Vehicle Torque Regulation Reducing Power Train Oscillations
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Solution Overview
Problem
Existing torque regulation methods in vehicles result in power train oscillations due to their static nature, leading to inferior vehicle performance and uncomfortable rocking, as they fail to optimize torque demand in various operating situations.
Innovation Solution
A dynamic torque regulation system that actively limits the difference between demanded torque and dynamic torque using feedback from earlier time intervals, allowing the torque demand to be continuously varied based on the dynamic torque pattern, thereby reducing power train oscillations by making the power train behave as if it were rigid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If static torque limiting ramps are employed to reduce power train oscillations, then power train oscillations are reduced, but vehicle performance becomes inferior due to unnecessarily limited torque demand
Solution Approach 1:
The patent transitions from static torque limiting ramps to dynamic torque limiting ramps that continuously adapt to current operating conditions. The system calculates optimal torque limits based on real-time parameters such as engine speed, load, and power train state, allowing torque demand to be optimized for each specific situation rather than being constrained by fixed conservative limits.
Solution Approach 2:
The patent changes the torque limiting parameter from a fixed static value to a dynamically calculated value that varies with operating conditions. The torque limit is computed as a function of engine speed, load, and power train characteristics, enabling the system to adjust torque demand parameters optimally for each operating point while still preventing oscillations.
2Object-affected harmful factors
If static torque limiting ramps are used to prevent power train oscillations, then oscillations are reduced, but the torque limit is not optimized for different operating situations leading to unnecessary performance loss
Solution Approach 1:
The system implements dynamic torque limiting ramps that continuously adapt to current operating conditions including engine speed, load, and power train state. This allows the torque limit to be optimized for each specific operating situation rather than using a single conservative static limit applicable to all conditions.
Solution Approach 2:
The patent employs feedback mechanisms where the system continuously monitors operating parameters and uses this information to adjust the torque limit dynamically. The torque limiting calculation incorporates real-time feedback about engine state and power train conditions to determine the optimal torque limit for preventing oscillations while maximizing performance.
Data Source
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AI summary
The present invention proposes a system for regulation of torque demanded Tq demand from a prime mover of a vehicle, which prime mover is adapted to responding to the torque demanded Tq demand by delivering a dynamic torque Tq fw . This dynamic torque Tq fw is related by a gear ratio i to a dynamic wheel torque Tq wheel which a power train comprising the prime mover is adapted to imparting to at least one tractive wheel of the vehicle. According to the present invention the system is adapted to conducting the regulation of the torque demanded Tq demand in such a way that a difference between the torque demanded Tq demand and the dynamic torque Tq fw is actively limited by employing feedback of the dynamic torque Tq fw (t— Δt) at an earlier time t— Δt . The torque demanded Tq demand at a time t for the regulation is here limited to a maximum value Tq demand,max which exceeds the dynamic torque Tq f W (t— Δt) at an earlier time t— Δt by an offset value Tq offset max , i.e. Tq demand,max (t) = Tq fw (t -Δ t) + Tq offset>max . The torque demanded Tq demand is thus continuously varied according to the dynamic torque Tq fw , so that power train oscillations in the vehicle are reduced in number and/or magnitude.