Steering Torque Compensation for Judder and Shimmy Detection
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Solution Overview
Problem
Existing torque compensating systems often incorrectly detect judder and shimmy in steering wheels, leading to uncomfortable driving experiences due to inappropriate inverse compensation torque application.
Innovation Solution
A torque compensating device and method that calculates a compensation torque amount through band pass filtering based on vehicle speed, generates inverse compensation torque when judder or shimmy is detected, and stops its generation if the torque amount is below a certain reference value, distinguishing between actual judder/shimmy and temporary kickback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inverse compensation torque is generated to cancel steering wheel vibrations, then driver comfort is improved, but erroneous detection of judder and shimmy causes continuous inverse compensation torque to be applied unnecessarily, deteriorating steering feeling
Solution Approach 1:
The system dynamically adjusts the detection threshold for judder and shimmy based on vehicle speed. As vehicle speed changes, the threshold is updated accordingly, allowing the system to adapt to different operating conditions. This dynamic adjustment prevents erroneous detection that would occur with a fixed threshold, thereby improving reliability while maintaining vibration cancellation when actually needed.
Solution Approach 2:
The patent changes the detection parameters (threshold values) based on vehicle speed. By modifying the threshold parameter dynamically, the system can accurately distinguish between actual judder/shimmy vibrations and normal steering inputs across different speed ranges. This parameter adaptation resolves the contradiction by improving detection accuracy without sacrificing vibration cancellation effectiveness.
2Device complexity
If a fixed threshold is used to detect judder and shimmy, then detection is simple, but detection accuracy deteriorates due to varying vehicle speeds and conditions
Solution Approach 1:
The detection threshold is made dynamic rather than fixed, automatically adjusting based on vehicle speed. This maintains relatively simple system architecture while significantly improving detection accuracy across varying operating conditions. The dynamic threshold adapts to different speed ranges, preventing both false positives and false negatives without requiring complex multiple-sensor systems.
Solution Approach 2:
The system changes the detection threshold parameter based on vehicle speed conditions. This single parameter adjustment dramatically improves measurement precision while keeping the overall detection system relatively simple. The threshold is updated according to pre-established speed-threshold relationships, avoiding the need for complex real-time analysis algorithms.
3Stability of the object's composition
If inverse compensation torque is applied to cancel judder and shimmy, then steering wheel vibration is reduced, but driver comfort deteriorates when the torque is applied erroneously due to misdetection
Solution Approach 1:
The inverse compensation torque generation is dynamically controlled based on real-time detection of actual judder and shimmy conditions. The system only applies torque when genuine vibrations are detected, avoiding erroneous applications that would occur with fixed thresholds. This dynamic control ensures steering wheel stability when needed while preventing harmful erroneous torque applications that would deteriorate driver comfort.
Solution Approach 2:
The system uses feedback from the vibration detection system to control torque application. By continuously monitoring steering wheel vibrations and comparing them against dynamic thresholds, the system receives feedback about actual vibration conditions. This feedback mechanism prevents erroneous torque application by ensuring torque is only generated when actual judder or shimmy is detected, rather than normal steering inputs.
Data Source
AI summary
The embodiments of the present disclosure relate to a torque compensating device and method. Specifically, the torque compensating device according to the present disclosure may include a compensation torque amount calculator for calculating a compensation torque amount by performing band pass filtering on a frequency corresponding to a vehicle speed of a host vehicle, an inverse compensation torque generator for generating an inverse compensation torque if it is determined that judder and shimmy of a steering wheel have occurred based on the compensation torque amount, and a controller configured to control the generation of the inverse compensation torque to be stopped by determining to be a temporary kickback if the compensation torque amount is calculated to be less than or equal to a first reference value.