BEV Motor Control Mode Switching for Consistent Startup Driving
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Solution Overview
Problem
Drivers of battery electric vehicles experience discomfort due to unpredictable control modes at startup, which differ between driving like a manual transmission (MT) vehicle and a normal electric vehicle, requiring mode switching that can feel troublesome.
Innovation Solution
A battery electric vehicle with a mode selection device and control device that allows drivers to select between MT and EV modes, automatically initializing to EV mode at startup, and controlling the electric motor output based on accelerator and shifter operations to mimic MT vehicle dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the control mode at startup is not determined and left to driver selection, then drivers can selectively enjoy both MT vehicle driving and normal EV driving, but drivers have to deal with the difference in operation due to different control modes which makes them feel troublesome
Solution Approach 1:
The control device automatically determines and sets the control mode at startup before the driver begins operating the vehicle. This preliminary action eliminates the need for drivers to manually select modes at each startup, ensuring consistent operation characteristics while still allowing mode switching during driving through the mode selection device.
2Ease of operation
If the control mode is automatically determined at startup, then operation consistency is improved and driver trouble is eliminated, but driver flexibility in selecting between MT and EV driving modes is reduced
Solution Approach 1:
The system performs preliminary automatic mode determination at startup to ensure operational consistency, but preserves driver flexibility by allowing mode switching through the mode selection device during driving operations.
Solution Approach 2:
The control mode transitions from a static automatic determination at startup to a dynamic state where drivers can switch modes during driving using the mode selection device, adapting the system behavior to different driving phases and driver preferences.
3Adaptability or versatility
If different control modes are available for selection, then driving experience versatility is improved, but device complexity increases due to mode selection mechanism
Solution Approach 1:
The mode selection device serves multiple functions: it allows driver preference selection, enables switching between MT and EV driving modes, and works in conjunction with the automatic determination feature. This multi-functionality reduces the need for separate systems while achieving versatile driving experiences.
Solution Approach 2:
The patent combines the automatic mode determination feature with the manual mode selection device into a unified control system. The control device integrates both automatic startup mode selection and manual mode switching capabilities, reducing overall system complexity compared to having separate independent systems.
Data Source
AI summary
Battery electric vehicle includes an accelerator pedal, a shifter, a mode selection device, and a control device. When the electric motor is controlled in EV mode, the control device changes the output of the electric motor in accordance with the operation of the accelerator pedal regardless of the operation position of the shifter, and when the electric motor is controlled in MT mode, the control device changes the output characteristic of the electric motor with respect to the operation of the accelerator pedal in accordance with the operation position of the shifter. When battery electric vehicle is activated, the mode selection device automatically selects a particular control mode, preferably an EV mode, between EV mode and MT mode.