Turbo Compound Control for Exhaust Energy Trade-Off
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Solution Overview
Problem
Existing turbo-compound systems face a trade-off between recovering exhaust energy and increasing fuel efficiency, as high back pressure leads to pumping loss and deteriorated fuel efficiency, with existing solutions either not addressing the paradoxical relationship or increasing apparatus size.
Innovation Solution
A control system for a turbo-compound system that includes a turbocharger, a turbine generator, a power-generation-amount control unit, a back-pressure control unit, and a turbo controller to manage the power generation and back pressure, optimizing the system for low fuel consumption by balancing the increase in pumping loss and energy recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If exhaust energy is recovered by an electric turbo compound, then energy recovery is improved, but back pressure increases causing pumping loss and deteriorated fuel efficiency
Solution Approach 1:
The system dynamically adjusts the power generation amount of the turbine generator based on engine operating conditions (engine speed, load, exhaust temperature). By making the power generation amount variable rather than fixed, the system can optimize the balance between energy recovery and back pressure at different operating points, preventing excessive pumping loss while maximizing exhaust energy utilization.
Solution Approach 2:
The control device changes the power generation amount parameter of the turbine generator according to engine operating conditions. By adjusting this parameter dynamically, the system optimizes the trade-off between exhaust energy recovery and back pressure-induced pumping loss, ensuring fuel efficiency is not deteriorated while achieving energy recovery.
2Power
If power generation amount of turbine generator is increased, then energy recovery is improved, but back pressure increases causing fuel efficiency deterioration
Solution Approach 1:
The system makes the power generation amount dynamic by adjusting it based on real-time engine operating conditions including engine speed, load, and exhaust temperature. This dynamic adjustment allows the system to maximize power generation when conditions are favorable while reducing power generation when it would cause excessive back pressure and fuel efficiency deterioration.
Solution Approach 2:
The control device uses feedback from engine operating parameters (engine speed, load, exhaust temperature) to continuously adjust the power generation amount. This closed-loop control ensures that power generation is optimized based on actual operating conditions, preventing the back pressure from increasing to levels that would deteriorate fuel efficiency while still achieving effective energy recovery.
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
Enables low fuel-consumption operation by effectively controlling back pressure and generator output, ensuring that the recovery of exhaust energy improves fuel efficiency without increasing pumping loss, thus maintaining advantageous effects of the turbo compound.
Implementation Method 1
a turbine generator (7) rotated by exhaust gas from an engine (3)
Data Source
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AI summary
An object is to enable low fuel-consumption operation of an engine by controlling a back pressure and a power generation amount taking account of a trade-off relationship between deterioration of fuel efficiency due to an increase in pumping loss due to a back-pressure rise of the engine and improvement of fuel efficiency due to recovery of exhaust energy by a turbo compound. A control system includes: a turbocharger 5; a turbine generator 7; a power-generation-amount control unit 51 of the turbine generator 7; a back-pressure control unit 53 configured to control a back pressure of the engine; and a turbo controller 17 including a power-generation-mode setting unit 31 to set the turbine generator to a low fuel-consumption mode, the turbo controller 17 being configured to, in the low fuel-consumption mode, control the power-generation-amount control 51 unit and the back-pressure control unit 53 so that the engine 3 continues low fuel-consumption operation, on the basis of a relationship between an increase in pumping loss due to a back-pressure rise for rotating the turbine generator 7 and a recovery amount of exhaust energy by the turbine generator 7.