Vehicle Body Tilting Control Using Corrected Shaft Angle Sensing

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Solution Overview

Problem

The accuracy of existing vehicle body tilting apparatuses is limited by the accuracy of absolute angle sensors, which restricts the improvement of lean actuator performance and hinders its application in products requiring higher accuracy.

Innovation Solution

A vehicle body tilting apparatus that includes a swing member connected to tie rods, a lean actuator with a motor and reducer to tilt the vehicle body, and a controller that corrects the rotation angle of the output shaft based on the difference between estimated and detected relative angles of the motor, using a combination of absolute and relative angle sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If an absolute angle sensor is mounted on the output shaft to directly detect the rotation angle, then the detection is straightforward, but the accuracy is limited by the sensor's inherent precision

Engineering Contradiction:

Improverotation angle detection accuracyVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent introduces a relative angle sensor on the motor shaft and an absolute angle sensor on the output shaft as intermediary measurement points. By measuring the relative motion at the motor shaft and combining it with the absolute position at the output shaft, the system achieves higher precision rotation angle detection without directly mounting a high-precision sensor on the output shaft

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces direct mechanical coupling measurement with a combined electromechanical measurement system. Instead of relying solely on a mechanical absolute angle sensor on the output shaft, the system uses electrical signals from both the relative angle sensor and absolute angle sensor, processed through a controller to calculate the corrected rotation angle, thereby achieving higher precision through signal processing rather than mechanical measurement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If a high-precision absolute angle sensor is used on the output shaft, then the lean actuator accuracy improves, but the product size and manufacturing cost increase

Engineering Contradiction:

Improvelean actuator accuracyVSAvoidproduct weight

Core Design Contradiction:

Measurement precisionVSWeight of moving object

Solution Approach 1:

The patent segments the measurement function into two parts: a relative angle sensor on the motor shaft measuring rotational position changes, and an absolute angle sensor on the output shaft measuring absolute orientation. This segmentation allows each sensor to be smaller and less expensive while their combined data provides high-precision lean actuator accuracy through controller processing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a virtual high-precision measurement system by copying and combining data from two lower-precision sensors. The relative angle sensor captures motor shaft position changes, and the absolute angle sensor captures output shaft orientation, and their combined information in the controller creates a virtual measurement system that achieves high precision without requiring a single large, expensive sensor

Inventive Principle:

Principle #26Copying

3Measurement precision

If a high-precision absolute angle sensor is used on the output shaft, then the lean actuator accuracy improves, but the manufacturing cost increases

Engineering Contradiction:

Improvelean actuator accuracyVSAvoidmanufacturing cost

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent segments the measurement function into two parts: a relative angle sensor on the motor shaft measuring rotational position changes, and an absolute angle sensor on the output shaft measuring absolute orientation. This segmentation allows each sensor to be smaller and less expensive while their combined data provides high precision lean actuator accuracy through controller processing

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent changes the measurement parameters from relying on a single high-precision absolute angle sensor to using two lower-precision sensors with different measurement functions (relative and absolute). This parameter change allows the use of more cost-effective sensors while achieving the same or better accuracy through mathematical combination of their readings in the controller

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12280626B2Vehicle body tilting apparatus and control method thereof

Publication Date: 2025.04.22 HL MANDO CORP

AI summary

Disclosed herein is a vehicle body tilting apparatus including a swing member connected to a pair of tie rods and provided to be swung around an output shaft, a lean actuator configured to swing the swing member by rotating the output shaft through a motor and a reducer so that a vehicle body is tilted in a right-left direction, and a controller electrically connected to the motor. The controller is configured to correct a rotation angle of the output shaft based on a relative angle of the motor, and control the motor according to the corrected rotation angle.