Electric Vehicle Motor Torque Synchronization Control

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Solution Overview

Problem

Conventional methods for controlling motor torque in electric vehicles result in sudden changes and unsynchronization between regenerative braking torque and coast regenerative braking torque, leading to reduced ride comfort and efficiency.

Innovation Solution

A method that determines vehicle driving conditions, limits and synchronizes creep torque and coast regenerative braking torque increase rates, and cancels limitations based on specific conditions to prevent sudden motor torque changes, ensuring synchronized operation of regenerative and coast regenerative braking torques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If regenerative braking torque and coast regenerative braking torque are applied according to predetermined curves independently, then each torque can be optimized for its specific function, but the torques become unsynchronized causing sudden motor torque changes and reduced ride comfort

Engineering Contradiction:

Improveride comfortVSAvoidtorque control synchronization

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the independent control of regenerative braking torque and coast regenerative braking torque into a unified synchronized control system. The controller coordinates both torques to be applied simultaneously at matching vehicle speeds, eliminating sudden torque transitions and improving ride comfort while maintaining the functional benefits of both torque types.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements dynamic adjustment of torque application timing and magnitude based on real-time vehicle speed and driving conditions. The control system continuously adapts the torque curves to ensure smooth transitions and synchronization, rather than using fixed predetermined curves that cause discontinuities.

Inventive Principle:

Principle #15Dynamics

2Ease of operation

If creep torque is applied to enable stationary vehicle movement, then vehicle mobility is improved, but sudden torque changes occur when transitioning from regenerative braking to creep torque reducing ride comfort

Engineering Contradiction:

Improvevehicle mobilityVSAvoidride comfort

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies beforehand cushioning by gradually reducing regenerative braking torque before transitioning to creep torque, and simultaneously gradually increasing creep torque. This cushioning approach prevents sudden torque changes at the transition point, maintaining ride comfort while enabling smooth vehicle mobility.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The control system dynamically adjusts the torque transition timing and rate based on vehicle speed and loading conditions. The creep torque application is dynamically coordinated with regenerative braking torque reduction to ensure continuous, smooth torque delivery without abrupt changes.

Inventive Principle:

Principle #15Dynamics

3Loss of energy

If regenerative braking is activated at high vehicle speeds, then fuel efficiency is improved through energy recovery, but the activation region is limited by vehicle speed constraints

Engineering Contradiction:

Improvefuel efficiencyVSAvoidactivation region

Core Design Contradiction:

Loss of energyVSAdaptability or versatility

Solution Approach 1:

The patent makes the coast regenerative braking system universal by enabling it to operate across a broader range of vehicle speeds and driving conditions. The synchronized torque application allows regenerative braking to be activated not only during traditional braking scenarios but also during coasting conditions, expanding the activation region and energy recovery opportunities.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent changes the operational parameters of regenerative braking by introducing coast regenerative braking torque that can be applied at higher vehicle speeds where traditional regenerative braking is limited. The synchronized control coordinates torque application parameters to optimize energy recovery across different speed ranges.

Inventive Principle:

Principle #35Parameter changes

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

This approach prevents shocks in the drive system, enhances ride comfort, and increases the activation region of coast regenerative braking, thereby improving fuel efficiency.

Implementation Method 1

the electric vehicle improves fuel efficiency through regenerative braking that converts kinetic energy into electrical energy

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS10532743B2Method for controlling motor torque in electric vehicle

Publication Date: 2020.01.14 HYUNDAI MOTOR CO LTD

AI summary

A method for controlling a motor torque in an electric vehicle, includes the steps of: (a) determining a driving condition of the vehicle; (b) determining whether or not a predetermined limiting condition for a creep torque increase rate is satisfied when it is determined that the vehicle is decelerating in step (a); and (c) limiting the creep torque increase rate when the limiting condition for a creep torque increase rate is satisfied, and applying a creep torque of which the increase rate has been limited.