Supercharger Control for Cylinder Deactivation Boost
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Solution Overview
Problem
In vehicle engines operating in Cylinder Deactivation (CDA) mode, the reduced exhaust gas volume and pressure hinder the turbocharger's ability to boost intake air pressure effectively, leading to decreased re-circulated exhaust gas volume and impaired engine performance.
Innovation Solution
A method and system for controlling a supercharger that determines whether to operate based on a difference value between target and current boost pressures, allowing the supercharger to enhance intake air pressure when the engine is in CDA mode, by adjusting the supercharger's RPM and EGR valve opening ratio to maintain optimal engine operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine operates in CDA mode to improve fuel efficiency, then fuel consumption decreases, but the exhaust gas volume and pressure decrease, causing the turbocharger to fail in boosting intake air pressure effectively
Solution Approach 1:
The patent introduces a supercharger as an intermediary device to compensate for the insufficient exhaust gas pressure and volume in CDA mode. The supercharger provides additional mechanical boosting to the intake air, mediating between the reduced exhaust gas conditions and the required intake air pressure for maintaining engine performance during fuel-efficient operation.
2Use of energy by moving object
If the engine operates in CDA mode, then fuel efficiency increases, but the re-circulated exhaust gas volume decreases, affecting EGR system performance
Solution Approach 1:
The supercharger acts as a mediator to compensate for the reduced exhaust gas volume in CDA mode. By providing additional intake air pressure, it indirectly supports the EGR system's ability to maintain proper re-circulated exhaust gas volumes despite the overall reduction in exhaust gas availability during cylinder deactivation.
3Power
If the turbocharger is used to boost intake air pressure, then engine performance is maintained, but in CDA mode the exhaust gas volume is insufficient to drive the turbocharger effectively
Solution Approach 1:
The patent merges the turbocharger and supercharger systems to work together. The turbocharger continues to provide exhaust-gas-driven boosting while the supercharger adds mechanical boosting capability. This combination allows the system to maintain high intake air pressure even when exhaust gas volume is insufficient, as the supercharger compensates for the turbocharger's reduced effectiveness in CDA mode.
Solution Approach 2:
The supercharger serves as an intermediary mechanical boosting device that compensates for the turbocharger's inability to maintain sufficient intake air pressure in CDA mode. It provides the additional pressure needed when exhaust gas volume is insufficient to drive the turbocharger effectively.
4Power
If the supercharger operates continuously to maintain intake air pressure, then engine performance is consistent, but energy consumption increases
Solution Approach 1:
The patent implements dynamic control of the supercharger operation based on real-time monitoring of exhaust gas conditions and intake air pressure requirements. The supercharger operates selectively rather than continuously, adjusting its operation to match the actual needs of the engine, particularly during transitions between normal and CDA modes. This dynamic approach maintains consistent engine performance while minimizing unnecessary energy consumption.
Solution Approach 2:
The control system monitors and responds to changes in operating parameters such as exhaust gas pressure, volume, and intake air pressure. Based on these parameter changes, the supercharger's operation is adjusted - increasing power output when parameters indicate insufficient boosting and reducing or stopping operation when parameters are within acceptable ranges, thereby optimizing energy consumption.
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
Effectively boosts intake air pressure and prevents a decrease in re-circulated exhaust gas volume, ensuring consistent engine performance even in CDA mode by strategically operating the supercharger and adjusting the EGR system.
Implementation Method 1
a turbocharger provided on an intake air flow line of an engine, and boosting pressure of intake air flowing into the engine
Implementation Method 2
the supercharger provided on the intake air flow line at a location in a downstream of the turbocharger, and boosting the pressure of intake air flowing into the engine
Data Source
AI summary
A method for controlling a supercharger of a vehicle includes: determining, at a first determination step, whether or not an engine operates in a cylinder deactivation (CDA) mode; calculating, at a second determination step, a difference value between a target boost pressure of a turbocharger and a current boost pressure of intake air boosted by the turbocharger, and determining whether or not the difference value is equal to or greater than a reference difference value; determining, at a third determination step, based on a current operating condition of the engine whether or not the supercharger is allowed to operate; determining, at a fourth determination step, a target rpm of the supercharger, and determining whether or not the target rpm is equal to or greater than a reference rpm; and operating the supercharger at an operating step.