Rear Wheel Steering Operation Amount Correction
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Solution Overview
Problem
Existing operation amount acquisition devices for actuators in vehicle steering systems face challenges in accurately detecting the operation amount due to large tolerances in sensors, leading to decreased control accuracy of rear wheel steering angles.
Innovation Solution
The proposed operation amount acquisition device acquires the operation amount based on a first physical quantity detected by a first physical quantity detecting device when the vehicle is in a predetermined set state, allowing for accurate validation and correction of the operation amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If operation amount is detected using a sensor with large tolerance, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The system detects a physical quantity that changes in response to operation amount changes, compares the detected value with a reference value, and feeds back correction information to improve measurement accuracy. This feedback mechanism compensates for sensor tolerance issues without requiring complex hardware.
Solution Approach 2:
Instead of directly relying on the imprecise sensor output, the system introduces an intermediary physical quantity detection step. The physical quantity detecting device detects a related physical quantity that serves as a mediator to validate and correct the operation amount, improving precision without increasing overall device complexity.
2Measurement precision
If operation amount is corrected based on physical quantity detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control device performs multiple functions: it controls the actuator, detects operation amount, detects related physical quantities, and performs correction processing. By making the control device multi-functional, the system avoids adding separate dedicated correction devices, thus improving precision without proportionally increasing complexity.
Solution Approach 2:
The system uses its own control device to perform both the actuation and the correction functions. The control device self-corrects the operation amount detection by utilizing the physical quantity detection capability already present in the system, rather than requiring external correction mechanisms.
3Measurement precision
If operation amount is acquired based on physical quantity in set state, then measurement precision is improved, but loss of time occurs due to state validation
Solution Approach 1:
The system preliminarily determines whether the vehicle is in the set state before performing correction processing. By checking the state condition first, the system avoids unnecessary correction calculations when conditions are not met, reducing time loss while maintaining precision when needed.
Solution Approach 2:
The system performs correction processing only partially - only when the vehicle is in the predetermined set state. This selective application of correction avoids the time cost of continuous correction while maintaining high precision during critical measurement conditions.
Data Source
AI summary
An operation amount acquisition device in a rear wheel steering system including a steering rod, an actuator, and a control device configured to control a steering angle of a left rear wheel and/or a right rear wheel based on an operation amount of the actuator, the operation amount acquisition device including: an operation amount detecting device configured to detect the operation amount; an inclination-related value detecting portion configured to detect an inclination-related value related to an inclination of a front-rear direction axis of the vehicle with respect to a traveling direction thereof; and an operation amount correcting portion configured to correct, based on a detected inclination-related value, the operation amount detected in a state in which the steering angle of the left rear wheel and/or the right rear wheel is controlled by the control device based on the operation amount such that the vehicle is in a straight traveling state.