EV Motor Control Switching for Manual Shift and ACC
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Solution Overview
Problem
In battery electric vehicles, the auto cruise control function is hindered when the vehicle speed is limited by the operation position of the shift device during manual shifting, preventing drivers from enjoying the driving experience similar to a manual transmission vehicle while maintaining the functionality of auto cruise control.
Innovation Solution
A battery electric vehicle with an electric motor, an accelerator pedal, a shifter, a mode selection device, and an auto cruise control device, where the motor control device switches control modes from manual to automatic when auto cruise control is requested, allowing the electric motor's output to vary with the accelerator pedal operation regardless of the shifter position, thus enabling unrestricted vehicle speed and unhindered auto cruise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the vehicle speed is limited according to the operation position of the shift device during manual shifting operation, then the driver can enjoy driving like an MT vehicle, but the function of the auto cruise control is hindered
Solution Approach 1:
The control device dynamically switches between manual mode and automatic mode based on whether auto cruise control is active. When auto cruise control is not active, the system operates in manual mode where motor output varies according to shifter position to provide MT-like driving experience. When auto cruise control becomes active, the system automatically switches to automatic mode where motor output varies independently of shifter position, ensuring uninterrupted cruise control functionality.
Solution Approach 2:
The system changes the control parameter for motor output based on the operational state. In manual mode, motor output is controlled by shifter position parameters. In automatic mode, motor output is controlled by cruise control parameters independent of shifter position. This parameter switching resolves the contradiction by adapting the control strategy to the current operational context.
2Adaptability or versatility
If the motor control device varies output characteristic according to shifter operation position in manual mode, then the driver enjoys MT vehicle driving experience, but the vehicle speed is restricted and auto cruise control cannot function properly
Solution Approach 1:
The system dynamically adjusts the relationship between shifter position and motor output based on the active control mode. In manual mode, motor output characteristics change according to shifter position to simulate MT driving. In automatic mode during cruise control, the system decouples motor output from shifter position, allowing vehicle speed to be determined solely by cruise control requirements rather than shifter position limitations.
Solution Approach 2:
The control device serves multiple functions by implementing different control strategies for different operational contexts. It provides MT-like driving experience when cruise control is inactive, and enables unrestricted speed control when cruise control is active. This multi-functionality allows the single system to satisfy both driving experience requirements and cruise control functionality.
Data Source
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AI summary
A battery electric vehicle includes: an accelerator pedal (22); a shifter (26); a mode selection device (42) that selects a control mode for an electric motor (2) from a manual mode and an automatic mode in accordance with a mode selection operation by a driver; and a motor control device (520). The motor control device (520) varies an output characteristic of the electric motor (2) for an operation of the accelerator pedal (22) in accordance with an operation position of the shifter (26) in the manual mode. The motor control device (520) varies an output of the electric motor (2) in accordance with the operation of the accelerator pedal (22), irrespective of the operation position of the shifter (26), in the automatic mode. When ACC is requested during control in the manual mode, the motor control device (520) switches control for the electric motor (2) from the manual mode to the automatic mode.