Dynamic Torque Command Inclination Control for Drive Motor Responsiveness

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Solution Overview

Problem

Conventional control methods for drive motor torque in eco-friendly vehicles, such as hybrid vehicles, result in delayed responsiveness and reduced drivability due to a fixed torque command inclination that does not account for varying demand torque levels or motor temperatures, leading to potential over-current issues.

Innovation Solution

A controller that dynamically adjusts the inclination of the drive motor torque command based on the demand torque and motor temperature, reducing the inclination as demand torque increases and motor temperature rises, to enhance responsiveness and prevent over-current.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fixed torque command inclination is used to prevent over-current, then element protection is improved, but motor torque responsiveness deteriorates

Engineering Contradiction:

Improveelement protectionVSAvoidmotor torque responsiveness

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The patent applies dynamics by making the torque command inclination variable rather than fixed. The controller dynamically adjusts the inclination based on real-time motor temperature and demand torque conditions, allowing the system to optimize between protection and responsiveness depending on operating state

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of torque command inclination based on motor temperature and demand torque. By adjusting this parameter according to operating conditions, the system achieves both element protection when needed and rapid torque response when conditions permit

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a conservative torque command inclination is used to protect elements, then reliability is improved, but time to reach demand torque increases

Engineering Contradiction:

Improveelement protectionVSAvoidtime to reach demand torque

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements feedback by continuously monitoring motor temperature and demand torque conditions, then using this information to adjust the torque command inclination. This closed-loop approach allows the system to learn from operating conditions and optimize the balance between protection and speed

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adapts the torque command inclination based on real-time feedback from temperature and torque sensors, transitioning from conservative fixed values to adaptive variable values that respond to actual operating conditions

Inventive Principle:

Principle #15Dynamics

3Device complexity

If a fixed torque command inclination is used regardless of motor temperature, then control simplicity is maintained, but drivability deteriorates

Engineering Contradiction:

Improvecontrol simplicityVSAvoiddrivability

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The patent makes the control system dynamic by adjusting torque command inclination based on motor temperature and demand torque. This dynamic adaptation improves drivability by matching the control characteristics to actual operating conditions without requiring complex manual intervention

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS10882507B2Vehicle having drive motor and method of controlling the same

Publication Date: 2021.01.05 HYUNDAI MOTOR CO LTD

AI summary

A vehicle having a drive motor is provided. The vehicle includes a controller that changes the inclination of a drive motor torque command based on a demand torque of a driver or a temperature of a drive motor. A motor controller then operates the drive motor to change the motor torque changes based on the inclination of the motor torque command.