BEV Motor Control Switching for Manual Shift and ACC
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Solution Overview
Problem
In battery electric vehicles, auto cruise control is hindered when the vehicle speed is limited by the operation position of the shift device during manual shifting, preventing drivers from enjoying driving like a manual transmission vehicle while maintaining the functionality of auto cruise control.
Innovation Solution
A battery electric vehicle with an electric motor, accelerator pedal, shifter, mode selection device, and 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 output to vary with the accelerator pedal operation irrespective of the shifter position, enabling seamless transition between manual and automatic modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual shifting operation is simulated by controlling motor torque according to shifter position, then manual transmission-like driving experience is improved, but auto cruise control function is hindered due to vehicle speed limitation
Solution Approach 1:
The control device dynamically switches between manual mode and automatic mode based on whether auto cruise control is active. In manual mode, motor torque is controlled according to shifter position to provide manual transmission-like driving. In automatic mode, vehicle speed is not limited by shifter position, enabling auto cruise control functionality. This dynamic switching resolves the contradiction by adapting the control strategy to the current operational context.
Solution Approach 2:
The system changes the control parameter from shifter-position-dependent torque control (manual mode) to accelerator-pedal-dependent torque control (automatic mode) when auto cruise control is activated. This parameter change allows the vehicle to transition from manual transmission simulation to unrestricted speed control, resolving the conflict between manual driving experience and auto cruise control functionality.
2Stability of the object's composition
If vehicle speed is limited according to shifter operation position during manual mode, then manual transmission driving characteristics are maintained, but auto cruise control cannot execute properly
Solution Approach 1:
The control device dynamically adjusts the speed limitation parameter based on the operational mode. When auto cruise control is active, the system switches to automatic mode where no speed limitation is applied, ensuring reliable cruise control execution. When auto cruise control is inactive, the system returns to manual mode with speed limitation according to shifter position, maintaining manual transmission characteristics.
Solution Approach 2:
The system changes the speed limitation parameter from 'limited by shifter position' in manual mode to 'unlimited' in automatic mode. This parameter change ensures that when auto cruise control is executed, the vehicle speed is not constrained by the shifter position, allowing proper cruise control functionality while preserving manual driving characteristics when cruise control is inactive.
3Ease of operation
If motor torque is controlled according to both accelerator pedal and shifter position, then manual driving engagement is enhanced, but system complexity increases
Solution Approach 1:
The control system is segmented into two distinct operational modes: manual mode and automatic mode. In manual mode, torque control follows shifter position for manual driving engagement. In automatic mode, torque control follows accelerator pedal position for cruise control functionality. This segmentation simplifies the control logic by avoiding complex simultaneous processing of multiple control inputs, reducing overall system complexity while maintaining manual driving engagement when needed.
Solution Approach 2:
The control device is designed to perform multiple functions through a single unified system that can operate in different modes. The same control device handles both manual transmission simulation (when in manual mode) and unrestricted speed control for cruise control (when in automatic mode), eliminating the need for separate control systems and reducing overall device complexity.
Data Source
AI summary
A battery electric vehicle includes: an accelerator pedal; a shifter; a mode selection device that selects a control mode for an electric motor from a manual mode and an automatic mode in accordance with a mode selection operation by a driver; and a motor control device. The motor control device varies an output characteristic of the electric motor for an operation of the accelerator pedal in accordance with an operation position of the shifter in the manual mode. The motor control device varies an output of the electric motor in accordance with the operation of the accelerator pedal, irrespective of the operation position of the shifter, in the automatic mode. When ACC is requested during control in the manual mode, the motor control device switches control for the electric motor from the manual mode to the automatic mode.