Battery EV Pseudo Shifter Control for Shorter Shift Time
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Solution Overview
Problem
Battery electric vehicles struggle to simulate manual transmission shifting operations of internal combustion engine vehicles, leading to prolonged shift times that cause driver discomfort.
Innovation Solution
A battery electric vehicle equipped with an electric motor, an accelerator pedal, a pseudo shifter, and a controller that adjusts the relationship among vehicle speed, accelerator operation, and torque in response to the pseudo shifter operation, incorporating a vehicle model with driver, engine, clutch, and transmission models to ensure shifting is completed within a predetermined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the rotational speed difference between the virtual engine rotational speed and the virtual input shaft rotational speed must decrease before clutch engagement, then the shifting operation accuracy is improved, but the shift time becomes excessively long causing driver discomfort
Solution Approach 1:
The system performs preliminary actions by calculating and preparing the virtual engine rotational speed and virtual input shaft rotational speed in advance using driver models and vehicle models before the actual clutch engagement. This allows the system to predict the rotational speed difference and prepare for optimal clutch engagement timing, thereby reducing the actual shift time while maintaining accuracy.
Solution Approach 2:
The patent replaces the mechanical clutch engagement process with a computational model that calculates virtual rotational speeds and determines clutch engagement timing algorithmically. This substitution allows for precise control of the shifting process without the delays inherent in mechanical systems, as the controller can instantly compute and execute the optimal engagement point.
2Stability of the object's composition
If the system waits for the rotational speed difference to decrease naturally, then the clutch engagement smoothness is improved, but the shift time increases causing driver discomfort
Solution Approach 1:
The system continuously monitors the calculated rotational speed difference between the virtual engine and virtual input shaft, and uses this feedback to determine the optimal moment for clutch engagement. The driver model and vehicle model provide real-time feedback on the shifting state, allowing the controller to execute clutch engagement at the precise moment when smooth engagement is achieved, without unnecessary waiting time.
Solution Approach 2:
The system dynamically adjusts the clutch engagement timing based on real-time calculations of rotational speed differences. Rather than following a fixed timing schedule, the system adapts the clutch engagement moment to the current dynamic state of the vehicle, ensuring smooth engagement while minimizing shift time. This dynamic approach allows the system to respond optimally to changing vehicle conditions.
Data Source
AI summary
A battery electric vehicle includes an electric motor as a driving source. The battery electric vehicle includes an accelerator pedal, a pseudo shifter, and a controller. The pseudo shifter imitates a shifter that is used to perform a shifting operation of a manual transmission internal combustion engine vehicle. The controller is configured to change a relationship among a vehicle speed of the battery electric vehicle, an accelerator operation amount of the accelerator pedal, and torque of the electric motor in response to an operation of the pseudo shifter. The controller is configured to change the relationship within a predetermined time after the pseudo shifter is operated.