EV Control System Signal Torque Vibration Feedback
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Solution Overview
Problem
Electric vehicles without a torque converter do not provide drivers with the necessary feedback to sense changes in vehicle behavior when launching, making it difficult for drivers to grasp the situation and shift position, leading to potential discomfort and misinterpretation of the vehicle's condition.
Innovation Solution
A control system that generates a signal torque by the motor when the brake pedal is returned, creating vibrations that allow drivers to sense changes in the vehicle's behavior, ensuring the driver can accurately understand the vehicle's situation and condition, including shift position and direction, without unintentionally launching the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor generates creep torque when the brake pedal is released, then the vehicle can be launched smoothly at low speed, but the driver cannot sense the change in vehicle behavior and may not grasp the situation accurately
Solution Approach 1:
The patent applies mechanical vibration by generating a signal torque that causes the vehicle body to vibrate when the brake pedal is released. This vibration provides tactile feedback to the driver, allowing them to sense the vehicle's launch state. The vibration is created by controlling the motor to generate a specific torque pattern that resonates with the vehicle's natural frequency, making the driver aware of the vehicle's condition without affecting overall vehicle movement.
Solution Approach 2:
The patent implements feedback by creating a sensory loop between the motor control system and the driver. When the brake pedal is released, the system generates a signal torque that produces vibrations detectable by the driver. This feedback mechanism allows the driver to perceive the vehicle's state (launching, shifting position) through tactile sensation, thereby improving situational awareness and understanding of the vehicle's operational condition.
2Loss of information
If the motor generates signal torque to provide driver feedback, then the driver can sense vehicle behavior changes, but the vehicle may unintentionally launch
Solution Approach 1:
The patent applies partial action by generating a signal torque that is sufficient to create perceptible vibrations but deliberately kept below the threshold that would cause vehicle launch. The control system calculates the brake force magnitude and generates a signal torque that is a fraction of the total brake force, ensuring it provides sensory feedback without overcoming the brake force to the extent of causing unintended movement.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the signal torque magnitude based on the detected brake force. The system modifies the torque parameter in real-time, ensuring it remains within safe limits that provide driver feedback while preventing vehicle launch. The signal torque is set to a specific range that creates vibrations without exceeding the brake force balance required to maintain vehicle stability.
3Use of energy by moving object
If conventional electric vehicles do not generate creep torque like conventional vehicles with torque converters, then electric consumption is reduced, but the driver experience and situational awareness are degraded
Solution Approach 1:
The patent applies mechanical vibration to recreate the sensory experience of conventional vehicle creep torque without the continuous energy consumption. By generating periodic signal torque that causes vibrations, the system provides tactile feedback to the driver during launch and shifting operations. This vibration-based approach achieves the driver experience goal while maintaining the energy efficiency advantage of electric vehicles by not requiring continuous creep torque generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The control system effectively allows drivers to sense and understand the vehicle's behavior changes, enhancing the driving experience by providing necessary feedback and reducing discomfort, while preventing unintentional movement by limiting the signal torque within the brake force limits.
Implementation Method 1
generating a signal torque by the motor when a brake pedal is returned, so as to allow a driver to sense a change in a behavior of the electric vehicle resulting from returning the brake pedal
Data Source
AI summary
A control system for an electric vehicle configured to allow a driver to grasp the situation of the electric vehicle when launching the electric vehicle by operating a brake pedal, and to reduce electric consumption of a motor. A controller controls the motor to generate a signal torque when a brake pedal depressed to generate brake force is returned so as to allow the driver to sense a change in a behavior of the vehicle, and terminate generation of the signal torque by the motor before the brake force is reduced to zero.