Hybrid Vehicle Torque Control for TCS Reliability

Solution Overview

Problem

Hybrid electric vehicles face challenges in maintaining engine torque and satisfying driver demand torque during traction control system (TCS) operations, leading to battery state of charge depletion and reduced power performance.

Innovation Solution

A method and apparatus that determine the engine operating point based on TCS demand torque, maintain engine torque, and perform torque reduction using both motor and engine torque, with the controller adjusting outputs based on a comparison with the motor's charging limit torque to preserve battery state of charge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the hybrid electric vehicle decreases engine torque to satisfy TCS demand torque, then the TCS requirement is met, but the driver's demand torque cannot be satisfied and the vehicle cannot smoothly start again

Engineering Contradiction:

ImproveTCS operation reliabilityVSAvoidvehicle acceleration performance

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent segments the torque reduction task between engine torque and motor torque. The engine torque is reduced to a level that maintains driver demand satisfaction, while the motor torque provides additional reduction capability to meet TCS requirements without compromising vehicle performance after TCS operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically adjusts the engine operating point parameters (torque and speed) based on TCS demand torque calculations. By changing the engine operating parameters to an optimal point that satisfies both TCS and driver demand, the system resolves the contradiction between TCS reliability and acceleration performance

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the hybrid electric vehicle decreases motor torque to satisfy TCS demand torque, then the TCS requirement is met, but the battery state of charge is depleted and power performance deteriorates

Engineering Contradiction:

ImproveTCS operation reliabilityVSAvoidbattery state of charge

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent segments the torque reduction task between engine torque and motor torque. The engine torque is reduced to a level that maintains driver demand satisfaction, while the motor torque provides additional reduction capability to meet TCS requirements without compromising vehicle performance after TCS operation

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically adjusts the engine operating point parameters (torque and speed) based on TCS demand torque calculations. By changing the engine operating parameters to an optimal point that satisfies both TCS and driver demand, the system resolves the contradiction between TCS reliability and acceleration performance

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10000196B2Apparatus and method for controlling torque reduction of hybrid electric vehicle

Publication Date: 2018.06.19 HYUNDAI MOTOR CO LTD

AI summary

A method for controlling torque reduction of a hybrid electric vehicle including a motor and an engine as a power source includes: determining whether a traction control system (TCS) is operating; calculating a demand torque of the TCS when the TCS is operating; determining an engine operating point according to the demand torque of the TCS; maintaining an engine torque according to the engine operating point; comparing a difference between the demand torque of the TCS and the engine torque according to the engine operating point with a charging limit torque of the motor; and performing torque reduction using a motor torque and the engine torque based on a result of the comparison.