Vehicle Shift Feeling Evaluation Method
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Solution Overview
Problem
Existing methods for evaluating shift feeling in vehicles with automated transmission are subjective and fail to provide a proper, objective quantification, leading to mixed sensations of smoothness and fastening, limiting the setting of accurate shift control targets.
Innovation Solution
An evaluation method that detects 6 measurement factors from vehicle acceleration signals and calculates sensory factors using arithmetic coefficients, followed by a sensory score calculation to objectively quantify shift feeling, enabling optimal shifting control based on human sensibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acceleration variation amount is used as shift control target, then responsiveness is improved, but smoothness deteriorates causing acceleration delay feeling
Solution Approach 1:
The patent segments the shift feeling evaluation into six distinct measurement factors (initial acceleration response time, final acceleration arriving time, average acceleration maintaining amount, acceleration rising slope, initial maximum jerk, end maximum jerk) instead of using a single acceleration variation metric. This segmentation allows independent optimization of responsiveness and smoothness by controlling each factor separately through weighted scoring.
Solution Approach 2:
The patent changes the evaluation parameter from simple acceleration variation amount to a comprehensive six-factor parameter system with weighted sensory scores. This parameter transformation enables precise control of shift characteristics by adjusting individual factor weights and target values, resolving the contradiction between responsiveness and smoothness.
2Loss of time
If prompt response time is attempted, then responsiveness is improved, but mixed sensations of smoothness and fastening occur
Solution Approach 1:
The patent introduces sensory factors (responsiveness, strength, smoothness, unperceivable) as intermediary metrics between physical acceleration measurements and human perception. These sensory factors act as mediators that translate six measurement factors into perceptually relevant dimensions, enabling precise evaluation and control of shift feeling without mixed sensations.
3Ease of operation
If subjective shift feeling evaluation is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces subjective human evaluation with an automated computational system that calculates sensory scores from acceleration sensor data. This substitution maintains ease of operation through automated processing while dramatically improving measurement precision through objective mathematical evaluation of six measurement factors against target values.
Data Source
AI summary
An evaluation method for a shift feeling of a vehicle, through which the shift feeling during a kick down operation of a driver is deduced as objectively quantitative value, it may be applied to a proper shift control corresponding to an expectancy of a driver based on the quantitative value.