Hybrid Vehicle Torque Intervention Control via Motor Intermediary

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Solution Overview

Problem

Hybrid vehicles face inefficiencies in torque intervention control during gear shifting, leading to fuel waste and reduced engine efficiency, particularly in dual clutch transmissions, where dynamic ignition angle control sacrifices engine efficiency to follow demand torque.

Innovation Solution

A method and device for controlling torque intervention in hybrid vehicles that adjust engine and motor torque by predicting shifting times and using eco ignition angle control to maximize engine efficiency, reducing engine torque before shifting and increasing motor torque, thereby avoiding engine torque intervention and improving fuel efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If torque intervention control is performed by reducing engine torque during gear shifting, then transmission shock is reduced, but engine efficiency deteriorates due to dynamic ignition angle control

Engineering Contradiction:

Improvetransmission shock reductionVSAvoidengine efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The motor acts as an intermediary to handle torque intervention during gear shifting. Instead of directly reducing engine torque (which causes efficiency loss), the motor compensates for transmission torque fluctuations, allowing the engine to maintain optimal operating conditions while still achieving smooth gear transitions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces traditional engine-based torque intervention (mechanical/combustion control) with motor-based torque intervention (electrical control). This substitution allows for more precise and efficient torque management during gear shifting, as the motor can rapidly adjust torque output without the efficiency penalties associated with engine ignition angle adjustments.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Adaptability or versatility

If engine torque is reduced by dynamic ignition angle control to follow demand torque, then torque demand is met, but combustion efficiency is sacrificed

Engineering Contradiction:

Improvetorque demand responseVSAvoidcombustion efficiency

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary torque intervention by the motor before actual gear shifting occurs. By anticipating the torque demand changes during gear shifts and compensating in advance, the engine can maintain its ignition angle for optimal combustion efficiency while the motor handles the transient torque requirements.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the control parameter from engine ignition angle to motor torque output. Instead of modifying engine combustion parameters (which directly impacts efficiency), the system adjusts motor torque parameters to meet demand variations, thereby decoupling torque adaptability from combustion efficiency.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If motor torque is increased to compensate for engine torque reduction, then transmission input torque is maintained, but overall energy efficiency decreases

Engineering Contradiction:

Improvetransmission input torque stabilityVSAvoidoverall energy efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent merges engine torque and motor torque control into a coordinated hybrid torque management system. During gear shifting, the motor and engine work together synergistically - the engine maintains base torque for efficiency while the motor provides supplemental torque for smooth shifting, achieving both torque stability and energy efficiency through combined action.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10106147B2Method and device for controlling torque intervention of hybrid vehicle

Publication Date: 2018.10.23 HYUNDAI MOTOR CO LTD

AI summary

A method for controlling torque intervention of a hybrid vehicle includes: during a torque phase time interval, reducing torque of an engine which is connected to a motor and generates a power transferred to a transmission by reducing an amount of air supplied to the engine in a state in which control for generating optimal combustion efficiency of the engine is maintained; increasing torque of the motor as much as the reduced torque of the engine during the torque phase time interval; and during an inertia phase time interval, reducing the increased torque of the motor by subtracting the reduced torque of the engine from an amount of torque intervention request for the transmission. The control for generating optimal combustion efficiency is obtained by controlling an ignition angle of the engine according to the amount of air supplied to the engine to maximize efficiency of the engine.