EV Pseudo Gear Shift Control for Curve Exit Acceleration
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Solution Overview
Problem
When deceleration control is activated in a battery electric vehicle capable of simulating gear shift operation of a manual transmission internal combustion engine vehicle, the acceleration property when exiting a curved road decreases due to the virtual engine speed going out of the torque band.
Innovation Solution
A battery electric vehicle with a pseudo gear shift operation member and a control apparatus that encourages the driver to operate the pseudo gear shift operation member as if increasing the gear ratio of a manual transmission internal combustion engine vehicle during deceleration control, thereby maintaining the virtual engine speed within the torque band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If deceleration control is executed when entering a curved road, then the vehicle can autonomously decelerate to navigate the curve, but the virtual engine speed goes out of the torque band causing decreased acceleration property when exiting the curved road
Solution Approach 1:
The control apparatus executes preliminary downshift control before the vehicle exits the curved road to ensure the virtual engine speed remains within the torque band. This advance action prevents the acceleration property degradation that would occur if the engine speed remained outside the optimal range throughout the entire curved road navigation.
Solution Approach 2:
The system dynamically adjusts the gear ratio by controlling the pseudo gear shift operation member based on real-time vehicle conditions. During deceleration control on curved roads, the control apparatus actively manages gear shifts to maintain virtual engine speed within the torque band, adapting the transmission ratio dynamically rather than using a fixed gear configuration.
2Adaptability or versatility
If the vehicle simulates manual transmission gear shift operation, then the driving experience resembles traditional vehicles, but the virtual engine speed may go out of the torque band during automated deceleration
Solution Approach 1:
The control apparatus continuously monitors the virtual engine speed and provides feedback control to the pseudo gear shift operation member. When detecting that the virtual engine speed approaches or exits the torque band during deceleration control, the system automatically adjusts gear shifts to bring the speed back within the optimal range, ensuring both simulation authenticity and performance reliability.
Solution Approach 2:
The system changes the gear ratio parameter dynamically during deceleration control to maintain virtual engine speed within the torque band. By adjusting the gear ratio in response to changing vehicle conditions, the system preserves the manual transmission simulation experience while preventing acceleration property degradation.
Data Source
AI summary
A battery electric vehicle according to an embodiment of the present disclosure includes a pseudo gear shift operation member that imitates an operation member used in gear shift operation of a manual transmission internal combustion engine vehicle in addition to a driving operation member used in driving thereof. A control apparatus that controls battery electric vehicle is configured to control the operation of the battery electric vehicle with respect to operation of the driving operation member in accordance with an operation state of the pseudo gear shift operation member. The control apparatus executes deceleration control that autonomously decelerates an own vehicle when the own vehicle enters a curved road. The control apparatus encourages a driver to operate the pseudo gear shift operation member in a manner similar to that when a gear ratio of the manual transmission internal combustion engine vehicle is increased when the deceleration control is executed.