Vehicle Control Apparatus for Enhanced Acceleration Feeling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems fail to provide a greater feeling of acceleration in power mode when the required output of the internal combustion engine is the same as in normal mode, due to limitations in throttle valve control.
Innovation Solution
A control apparatus with a continuously variable transmission mechanism that increases the rate of rotation speed of the engine output shaft more significantly in power mode than in normal mode, even when the throttle valve is fully open, allowing for quicker acceleration and increased jerk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the throttle valve opening amount is increased to provide greater acceleration feeling in power mode, then the acceleration feeling is improved, but the throttle valve is already fully open at maximum accelerator operation so no further increase is possible
Solution Approach 1:
The patent changes the control parameter from throttle valve opening amount to transmission speed ratio. By controlling the transmission mechanism to provide a greater rate of increase in engine output shaft rotation speed, the system achieves improved acceleration feeling in power mode without requiring the throttle valve to open beyond its maximum position.
2Speed
If the rate of increase in engine output shaft rotation speed is increased in power mode, then the acceleration feeling is improved, but the required engine output remains the same as in normal mode
Solution Approach 1:
The patent introduces the transmission mechanism as an intermediary between the engine and the driving wheels. By controlling the transmission speed ratio to decrease more rapidly in power mode, the system amplifies the engine's rotational speed increase, providing enhanced acceleration feeling without requiring the engine to produce additional power beyond what is needed for normal mode operation.
Data Source
AI summary
A control apparatus for a vehicle is provided for a vehicle that has a normal mode and a power mode as vehicle driving characteristics. The control apparatus includes a continuously variable transmission mechanism that steplessly changes a speed ratio when rotational driving force of an engine output shaft is transmitted to a rotating output shaft; and a control portion that controls the continuously variable transmission mechanism such that, when a rotation speed is increased to a target rotation speed and a required output of an internal combustion engine when the power mode is selected is the same as when the normal mode is selected, the rate of increase in the rotation speed is greater when the power mode is selected than when the normal mode is selected.