Vehicle Shift Control Device Gradient-Based Neutral Clutch Management
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Solution Overview
Problem
Conventional vehicle shift control methods during coasting fail to distinguish road gradients, leading to frequent clutch engagement and disengagement, causing drivability issues and fuel inefficiency due to unintentional deceleration and kick-down shifts.
Innovation Solution
A device and method that detect the road gradient and distance to adjust the shift stage by releasing the clutch and performing neutral control, determining the stop condition based on gradient and distance, and correcting the target shift stage to prevent unnecessary kick-down shifts and improve fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional neutral control method is used based on accelerator and brake operation, then fuel efficiency is improved during coasting, but clutch engagement and disengagement frequency increases causing rattling and acceleration delay
Solution Approach 1:
The system performs preliminary detection of road gradient and distance to the gradient position before neutral control is needed. By predicting the road conditions ahead, the system determines the appropriate shift stage in advance, preventing frequent clutch engagement/disengagement while maintaining fuel efficiency during coasting.
Solution Approach 2:
The system continuously monitors driving information including vehicle speed, accelerator/brake operation state, and road gradient. This feedback mechanism allows the control unit to adjust the shift stage dynamically based on actual road conditions, resolving the contradiction between fuel efficiency and drivability by making informed control decisions.
2Use of energy by moving object
If neutral control is performed without considering road gradient, then fuel efficiency is improved, but shift stage determination becomes inaccurate leading to kick-down shifts
Solution Approach 1:
The system collects driving information and detects road gradient in advance before neutral control is executed. This preliminary detection of gradient and distance allows the control unit to accurately determine the shift stage before coasting begins, preventing kick-down shifts while maintaining fuel efficiency.
Solution Approach 2:
The system changes the control parameters by incorporating road gradient and distance to gradient position into the shift stage determination. Instead of using only vehicle speed and pedal operation, the system adjusts the shift stage based on gradient degree, improving measurement precision while maintaining fuel efficiency benefits.
3Adaptability or versatility
If clutch is frequently engaged and disengaged during neutral control, then coasting control flexibility is improved, but drivability deteriorates due to rattling and acceleration delay
Solution Approach 1:
The system determines the shift stage in advance by detecting road gradient and distance before neutral control is activated. This preliminary determination prevents the need for frequent clutch engagement/disengagement during coasting, maintaining control flexibility while eliminating rattling and acceleration delay issues.
Solution Approach 2:
The system uses feedback from road gradient detection and vehicle state monitoring to make informed decisions about shift stage and clutch control. This feedback mechanism allows the system to maintain coasting control flexibility while avoiding frequent clutch operations that cause drivability issues.
Data Source
AI summary
A method for controlling a shift of a vehicle during a coasting driving is provided. The method includes performing a neutral control by releasing a clutch when an operation condition of the neutral control is satisfied during the coasting driving. Driving information regarding the vehicle is collected and a gradient of a forward road is detected using the driving information. A stop condition of the neutral control is determined using the gradient of the forward road, and a shift stage is determined when the neutral control is stopped.