Engine Speed Display Smoothing During Garage Parking Shifts
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Solution Overview
Problem
During a garage-parking shifting operation in a vehicle, the engine speed display can vary significantly due to changes in load and torque control, causing discomfort for the vehicle operator due to inadequate response times and temperature variations.
Innovation Solution
An engine speed display control device that implements a variation restricting display control, smoothing the displayed engine speed by using a target value instead of the actual value, and gradually changing the display during transitions to minimize variations and deviations from the target speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the actual engine speed value is displayed during garage-parking shifting operation, then the display reflects the true engine state, but the operator feels uneasy due to significant variations in displayed speed caused by load changes and torque control delays
Solution Approach 1:
The patent introduces an intermediary display value that mediates between the actual engine speed and the target engine speed during garage-parking shifting operations. This intermediary value is calculated to reduce variation compared to displaying the actual value directly, thereby reducing operator discomfort while still providing meaningful speed information.
Solution Approach 2:
The patent changes the display parameter from showing the actual engine speed value to showing a calculated value with reduced variation. This parameter change is applied specifically during garage-parking shifting operations when the accelerator pedal is in the non-operated position, transforming how speed information is presented to minimize operator unease.
2Stability of the object's composition
If the engine torque is controlled to match the timing of shifting action, then the engine speed variation is reduced, but it is difficult to adequately reduce variation due to variations in control response and transmission shifting control response caused by temperature and viscosity changes
Solution Approach 1:
The patent applies preliminary action by detecting the garage-parking shifting operation in advance and switching to variation restricting display control before significant engine speed variations occur. This allows the system to prepare for and mitigate the effects of control response delays and transmission shifting variations proactively.
Solution Approach 2:
The patent uses feedback by continuously monitoring the accelerator pedal position and transmission operating position to determine when garage-parking shifting operations are occurring. This feedback mechanism enables the system to dynamically adjust the display control strategy to maintain engine speed stability under varying conditions.
Data Source
AI summary
In an engine speed display control device of a vehicle including an engine speed display to display a determined display value of the engine speed, the engine speed display control device determines the display value of the engine speed, and includes a variation restricting display control portion configured to implement a variation restricting display control when a garage-parking shifting operation of the transmission shifting member is performed while the vehicle is held stationary in a non-operated position of the accelerator pedal. The variation restricting display control portion determines the display value of the engine speed in the variation restricting display control such that an amount of variation of the display value is smaller than in a normal display control in which the display value is determined according to the actual value.