Turbocharger Turbine Flow Cross-Section Control for Torque Response

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Solution Overview

Problem

Internal combustion engines experience boost pressure overshoots and delayed torque response during non-stationary operating states due to limitations in existing boost pressure regulators, which affect drivability and torque build-up.

Innovation Solution

A control unit that determines the lower limit of the turbine flow cross-section as a function of engine speed to optimize boost pressure and torque increase, avoiding excessive scavenging gradients and allowing rapid torque build-up without additional sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the turbine flow cross-section is limited at the bottom to avoid boost pressure overshoot, then boost pressure stability is improved, but torque build-up speed deteriorates

Engineering Contradiction:

Improveboost pressure stabilityVSAvoidtorque build-up speed

Core Design Contradiction:

Stability of the object's compositionVSSpeed

Solution Approach 1:

The patent applies dynamics by making the turbine flow cross-section adjustable and variable during operation. The control unit dynamically adapts the turbine flow cross-section based on operating conditions (stationary vs. non-stationary states), allowing the system to optimize between stability and response speed depending on the current operational context.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of turbine flow cross-section to resolve the contradiction. By adjusting this parameter differently in stationary states (to prevent overshoot) versus non-stationary states (to enable rapid torque build-up), the system achieves both stability when needed and rapid response when required.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If the regulator manipulated variable is limited to reduce overshooting, then boost pressure control precision is improved, but torque response delay increases

Engineering Contradiction:

Improveboost pressure control precisionVSAvoidtorque response delay

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The control unit dynamically adjusts the turbine flow cross-section based on whether the system is in a stationary or non-stationary state. During transient conditions, the system prioritizes rapid torque response over precise boost pressure control, temporarily allowing larger deviations to achieve faster response.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control unit anticipates the need for rapid torque build-up in non-stationary states and pre-adjusts the turbine flow cross-section accordingly, rather than waiting for the overshoot to occur and then correcting it.

Inventive Principle:

Principle #10Preliminary action

3Power

If exhaust gas energy is maximally transmitted to the turbine wheel, then turbine power is improved, but scavenging gradient increases causing charge pressure delay

Engineering Contradiction:

Improveturbine powerVSAvoidcharge pressure delay

Core Design Contradiction:

PowerVSLoss of time

Solution Approach 1:

The patent changes the turbine flow cross-section parameter to balance turbine power generation with scavenging gradient control. By adjusting this parameter, the system optimizes the trade-off between extracting energy from exhaust gases and maintaining adequate charge pressure for rapid torque build-up.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7954319B2Method and control unit for setting a turbine flow cross-section

Publication Date: 2011.06.07 DR ING H C F PORSCHE AG

AI summary

A turbine flow cross-section of a turbocharger of an internal combustion engine, is set such that a lower limit (TSQ_dyn_min) of a range of settable values of the turbine flow cross-section is determined as a function of an operating parameter of the internal combustion engine in non-stationary operating states. A speed of the internal combustion engine can be used as the operating parameter.