Hybrid Vehicle Turbo Boost Line Control for Torque Response

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Solution Overview

Problem

Hybrid vehicles with internal combustion engines and forced induction devices face delays in torque response due to limited power output from the power storage device, which the motor generator may not adequately compensate for, especially when the allowable power output is small.

Innovation Solution

The hybrid vehicle incorporates a forced induction device with a boost line mapped to rotation speed and torque, and a controller that adjusts the operating point to exceed the boost line at a higher rotation speed when power output is limited, increasing exhaust gas energy supplied to the forced induction device, thereby reducing the delay in torque response.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the motor generator is driven by the power storage device to compensate for torque response delay, then the torque response delay is reduced, but when the allowable power output from the power storage device is limited to a small value, the motor generator cannot generate sufficient torque to compensate

Engineering Contradiction:

Improvetorque response delayVSAvoidallowable power output from power storage device

Core Design Contradiction:

Loss of timeVSPower

Solution Approach 1:

The patent changes the operating parameters of the internal combustion engine by adjusting the boost line based on the allowable power output from the power storage device. When the allowable power output is small, the boost line is set to activate at higher rotation speeds, thereby increasing exhaust gas energy to enhance forced induction response and compensate for limited motor generator torque capability.

Inventive Principle:

Principle #35Parameter changes

2Speed

If the forced induction device boosts suctioned air at lower rotation speeds, then torque response is improved, but exhaust gas energy available for boosting is insufficient

Engineering Contradiction:

Improverotation speed at which boosting startsVSAvoidexhaust gas energy

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent dynamically adjusts the boost line parameters based on operating conditions. When allowable power output is limited, the boost line is configured to activate at higher rotation speeds where sufficient exhaust gas energy is available, ensuring effective forced induction while adapting to energy constraints.

Inventive Principle:

Principle #35Parameter changes

3Power

If the motor generator generates torque to compensate for engine torque delay, then overall torque response is improved, but the power storage device may not have sufficient capacity when allowable power output is small

Engineering Contradiction:

Improvetorque generated by motor generatorVSAvoidpower storage capacity

Core Design Contradiction:

PowerVSQuantity of substance

Solution Approach 1:

The patent enables the internal combustion engine to self-compensate for torque response delay by utilizing its own exhaust gas energy to enhance forced induction. This reduces reliance on external power storage capacity, as the engine's waste energy is harnessed to improve its own response characteristics.

Inventive Principle:

Principle #25Self-service

4Use of energy by moving object

If the boost line is set to activate at higher rotation speeds, then exhaust gas energy is increased for boosting, but torque response delay may increase at lower rotation speeds

Engineering Contradiction:

Improveexhaust gas energy for boostingVSAvoidtorque response delay at low rotation speeds

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The patent implements dynamic adjustment of the boost line based on real-time operating conditions, including allowable power output from the power storage device. The control system adapts the boost activation threshold to balance exhaust gas energy availability and torque response requirements across different operating ranges.

Inventive Principle:

Principle #15Dynamics

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 configuration reduces the delay in torque response when power output is limited, ensuring the vehicle maintains efficient performance by compensating with increased exhaust gas energy and precise control of the internal combustion engine and rotating electric machine.

Implementation Method 1

The internal combustion engine includes a forced induction device that boosts suctioned air to be fed to the internal combustion engine

Methodology Applied

Scientific EffectForced induction: Gas Compressor

Implementation Method 2

increase exhaust gas energy supplied to the forced induction device

Methodology Applied

Scientific EffectExhaust gas energy: Turbine

Data Source

PatentUS11554769B2Hybrid vehicle

Publication Date: 2023.01.17 TOYOTA JIDOSHA KK

AI summary

A vehicle includes an engine, a first MG, a planetary gear mechanism, a battery that stores power generated by the first MG and supplies the stored power to the first MG, and an HV-ECU that controls the engine and the first MG. The engine includes a turbo. A boost line is determined on a map representing a relationship between the rotation speed of the engine and torque generated by the engine, and the turbo boosts suctioned air when torque generated by the engine, as indicated by an operating point on the map, exceeds the boost line. The HV-ECU controls the engine and the first MG so that when the allowable value Wout of power output from the battery is small, the operating point exceeds the boost line at a higher rotation speed than when the allowable value Wout is large.