EV Torque Control With Virtual Clutch and Sequential Shifting
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Solution Overview
Problem
Existing electric vehicles fail to replicate the operational feeling of a transmission vehicle while maintaining ease of operation.
Innovation Solution
Incorporation of a control device that manages the relationship between base torque, vehicle speed, and operation amounts through indicators simulating a clutch pedal and sequential shifter, allowing for gear shift operations similar to a transmission vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electric vehicle uses normal EV traveling mode, then ease of operation is maintained, but operational feeling similar to transmission vehicle is not achieved
Solution Approach 1:
The system dynamically switches between EV traveling mode and MT traveling mode based on driver selection. In MT mode, the control device reproduces transmission vehicle behavior by virtually simulating gear shifts and clutch operations, allowing the same vehicle to adapt to different driving experience requirements while maintaining ease of operation in EV mode.
Solution Approach 2:
The control device changes operational parameters by virtually reproducing gear shift positions and clutch operation states. When the driver operates the shift lever or clutch pedal in MT mode, the control device adjusts motor torque and vehicle behavior parameters to simulate corresponding transmission vehicle characteristics, providing authentic transmission vehicle operational feeling.
2Adaptability or versatility
If the electric vehicle reproduces transmission vehicle behavior, then operational feeling similar to transmission vehicle is achieved, but device complexity increases
Solution Approach 1:
Instead of physically installing a real transmission system, the patent uses virtual copying by simulating transmission vehicle behavior through control software. The control device creates virtual gear shift positions and clutch operation states that replicate transmission vehicle characteristics, achieving authentic operational feeling without the complexity of actual transmission mechanical components.
Solution Approach 2:
The patent replaces the mechanical transmission system with an electrical control system. The control device uses motor torque control and virtual gear ratio calculations to substitute for physical gears and clutch mechanisms, thereby achieving transmission vehicle-like operation while eliminating complex mechanical transmission components.
3Adaptability or versatility
If the electric vehicle uses sequential shifter operation, then gear shift operation similar to transmission vehicle is achieved, but ease of operation decreases
Solution Approach 1:
The system dynamically adjusts its operational characteristics based on the selected mode. In EV mode, simple accelerator-based control provides ease of operation. In MT mode, the system dynamically reproduces sequential shifter behavior where gear shifts occur in fixed sequences, providing authentic transmission vehicle gear shift operation experience.
Data Source
AI summary
An electric vehicle has an electric motor as a drive source and includes a control device, a first indicator, a second indicator, and a third indicator. The control device switches a relationship among base torque, an operation amount of the first indicator, and a vehicle speed of the electric vehicle, in a plurality of predetermined relationships in accordance with operation of the second indicator, decreases the torque of the electric motor from the base torque in response to a direction from the third indicator, and accepts input from the second indicator only when an operation amount of the third indicator is larger than a predetermined amount.