EV-to-MT Mode Switching With Speed-Based Virtual Gear Selection
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Solution Overview
Problem
In battery electric vehicles with a shift device that relatively specifies gear position, the gear position cannot be uniquely determined when switching from an EV mode to an MT mode, as the virtual gear position is not set in the EV mode.
Innovation Solution
A battery electric vehicle system that includes a processor to control the electric motor, a first controller for continuous operation, and a second controller for discrete operations, allowing the selection of a virtual gear position based on vehicle speed when switching from EV to MT mode, using a relative control type shift device and pseudo clutch pedal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a relative control type shift device is used to specify gear position, then the device complexity is reduced and ease of operation is improved, but the gear position cannot be uniquely determined when switching from EV mode to MT mode
Solution Approach 1:
The control device automatically determines the virtual gear position in advance when switching from EV mode to MT mode, based on vehicle speed and acceleration requirements. This preliminary action ensures that the gear position information is established before the driver operates the shift device, resolving the contradiction by providing the necessary information without increasing device complexity.
Solution Approach 2:
The control device uses vehicle speed and acceleration information to automatically select the appropriate virtual gear position, making the system self-sufficient in determining gear position. This self-service approach eliminates the need for additional hardware to specify gear position, maintaining ease of operation while preventing information loss.
2Device complexity
If virtual gear position is not set in EV mode, then the system simplicity is maintained, but acceleration performance may be insufficient or excessive when switching to MT mode
Solution Approach 1:
The control device changes the virtual gear position parameter based on vehicle speed and acceleration requirements when switching from EV mode to MT mode. By dynamically adjusting this parameter, the system maintains simplicity while ensuring reliable acceleration performance matched to current driving conditions.
Solution Approach 2:
The virtual gear position is dynamically determined based on real-time vehicle speed and acceleration information rather than being fixed. This dynamic approach allows the system to maintain simplicity while adapting to varying driving conditions, ensuring reliable acceleration performance when switching modes.
Data Source
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AI summary
A battery electric vehicle (100) includes a processor (102), a first controller (22), and a second controller (24). The battery electric vehicle (100) includes a first mode and a second mode. The processor (102) is configured to execute switching a relationship between an operation amount of the first controller (22) and torque of the electric motor (4F, 4R) from among a plurality of predetermined relationships in accordance with an operation of the second controller (24) in a case where the electric motor (4F, 4R) is controlled in the second mode, and selecting the relationship between the operation amount of the first controller (22) and the torque of the electric motor (4F, 4R) from among the predetermined relationships in accordance with a vehicle speed of the battery electric vehicle (100) in a case where the first mode is switched to the second mode.