Electric Compressor Valve Control for Engine Boost Transients
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Solution Overview
Problem
Existing internal combustion engines face issues with rapid drops or losses in intake pressure, particularly boost pressure, during engine load transients, leading to adverse engine power fluctuations and oscillations, which are not adequately addressed by current technologies.
Innovation Solution
An internal combustion engine system incorporating a compressor driven by an electric machine, a control valve, and a controller that adjusts the compressor and control valve to influence mass flow and intake pressure, using command values based on control valve positions and gradients to maintain stable intake pressure and engine power during and after transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the electric machine is switched off after a desired engine load is reached, then energy consumption is reduced, but intake pressure and engine power drop rapidly causing adverse oscillations
Solution Approach 1:
The controller performs preliminary action by controlling the electric machine in dependence on command values for the control valve before the electric machine is switched off. This ensures that intake pressure is maintained at a desired level even during transient operations, preventing rapid pressure drops and adverse oscillations when the electric machine is subsequently switched off.
2Reliability
If the electric machine operates temporarily during transients to maintain intake pressure, then intake pressure stability is improved, but the control complexity increases due to timing and rate of change requirements
Solution Approach 1:
The controller uses feedback by continuously monitoring command values for the control valve and adjusting the electric machine operation accordingly. The electric machine is controlled in dependence on these command values, creating a closed-loop control system that automatically maintains intake pressure without requiring complex timing algorithms or manual intervention.
3Ease of operation
If the electric machine is operated with bad timing or unfavorable rate of change, then ease of operation is simplified, but intake pressure loss and engine power oscillation increase
Solution Approach 1:
The feedback mechanism ensures that the electric machine is always controlled with appropriate timing and rate of change by continuously adjusting operation based on current control valve command values. This eliminates the harmful effects of bad timing or unfavorable rate of change while keeping the operation simple through automatic control.
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
The system ensures smooth transitions from active to inactive electric machine operation, preventing intake pressure losses and maintaining reference engine power, enhancing efficiency and component longevity without complex control algorithms.
Implementation Method 1
at least one compressor (4) for compressing a gas flow
Data Source
AI summary
Internal combustion engine with an intake for intaking air and/or an air-fuel-mixture, at least one compressor for compressing a gas flow, an electric machine for driving the at least one compressor, at least one control valve, and a controller for controlling the electric machine and the at least one control valve, wherein the at least one compressor and the at least one control valve are configured to directly or indirectly influence a mass flow and/or an intake pressure in the intake, wherein the controller is configured to control the electric machine in dependence on at least one command value for the at least one control valve.