EV Shift Travel Mode Torque Lockout for Stable Vehicle Behavior
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Solution Overview
Problem
Battery electric vehicles experience sudden changes in behavior due to fluctuations in torque output when simulation torque is changed in shift travel mode, leading to unpredictable vehicle behavior during travel.
Innovation Solution
A control device is implemented to prohibit changes in simulation torque while the vehicle is traveling, allowing changes only when the vehicle is in a parking range or with the parking brake activated, and a display device is used to manage user input for torque changes, ensuring that changes are not received while the vehicle is in motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If simulation torque is changed while the vehicle is traveling in shift travel mode, then the torque behavior can simulate engine vehicle characteristics, but the torque output to the drive shaft fluctuates causing sudden changes in vehicle behavior
Solution Approach 1:
The control device prohibits changes in simulation torque while the vehicle is traveling, preventing torque fluctuations before they can cause sudden vehicle behavior changes. This preemptive restriction eliminates the harmful effect of torque variability during motion, while still allowing torque changes when the vehicle is stopped for safe adjustments.
2Reliability
If the control device prohibits changes in simulation torque while traveling, then vehicle behavior stability is improved, but the adaptability of torque adjustment is reduced
Solution Approach 1:
The control device dynamically adjusts the permissibility of simulation torque changes based on vehicle state: prohibiting changes during travel to ensure stability, while permitting changes when stopped to enable adaptability. This conditional control strategy optimizes both reliability and adaptability according to operational context.
3Adaptability or versatility
If torque output to the drive shaft is allowed to fluctuate for simulation purposes, then the shift travel mode can simulate engine vehicle torque behavior, but the vehicle behavior changes suddenly during travel
Solution Approach 1:
The control device prevents torque fluctuations during travel by prohibiting simulation torque changes in this state, eliminating unpredictable vehicle behavior before it occurs. The system maintains simulation capability when stopped, preserving the ability to mimic engine vehicle characteristics without compromising operational predictability.
Data Source
AI summary
A battery electric vehicle includes: a mode selection device in which one travel mode is selected from a plurality of travel modes by an operation of a driver, the travel modes including a motor travel mode in which a motor is controlled such that required torque required for traveling is output to a drive shaft, and a shift travel mode in which the motor is controlled such that torque output to the drive shaft based on a shift operation by the driver is simulation torque that simulates torque behavior in an engine vehicle equipped with an engine and a stepped transmission; and a control device that controls the motor such that the battery electric vehicle travels in the travel mode selected by the mode selection device. The control device prohibits a change in the simulation torque while the battery electric vehicle is traveling, when the shift travel mode is selected.