Engine Control Device for Turbo Lag Reduction
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Solution Overview
Problem
Existing control methods for turbo-supercharger-equipped internal combustion engines fail to enhance acceleration performance across all supercharging regions and do not effectively reduce turbo lag.
Innovation Solution
A control device that includes a variable valve mechanism, ignition timing adjustment, and fuel injection management to optimize valve timing and ignition timing based on supercharging pressure, allowing for retarding of ignition timing in low supercharging regions and completion of correction in high supercharging regions, along with valve overlap to enhance scavenging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ignition timing is retarded in low supercharging region, then supercharging efficiency is improved, but acceleration performance in high supercharging region is not optimized
Solution Approach 1:
The control device dynamically adjusts ignition timing and valve timing based on the supercharging pressure level. In low supercharging regions, ignition timing is retarded to improve supercharging efficiency. In high supercharging regions, the control switches to valve timing control with valve overlap to enable scavenging. This dynamic adaptation resolves the contradiction by optimizing parameters for different operating conditions.
Solution Approach 2:
The control device changes operating parameters (ignition timing angle, valve timing positions) based on the detected supercharging pressure. By switching between different parameter sets appropriate for low and high supercharging regions, the system achieves both improved supercharging efficiency and optimized acceleration performance across all regions.
2Loss of energy
If valve timing control for scavenging is applied, then supercharging efficiency is enhanced in high supercharging region, but low supercharging region performance is not improved
Solution Approach 1:
The control device dynamically selects the appropriate control strategy based on supercharging pressure levels. Valve timing control for scavenging is applied only when supercharging pressure is sufficient (high region), while ignition timing retard control is used in low supercharging regions. This dynamic selection ensures optimal performance across all operating conditions.
Solution Approach 2:
The control device adjusts timing parameters based on operating conditions. In high supercharging regions, valve timing is adjusted to create overlap for scavenging. In low supercharging regions, ignition timing is retarded instead. This parameter adaptation resolves the contradiction by matching the control strategy to the operating region.
3Speed
If ignition timing is retarded to increase exhaust temperature, then turbine response is improved, but comprehensive acceleration performance across all regions is not optimized
Solution Approach 1:
The control device dynamically adjusts ignition timing based on supercharging pressure to optimize turbine response in different regions. In low supercharging regions, ignition timing is retarded to increase exhaust temperature and improve turbine response. In high supercharging regions, the control switches to valve timing control for scavenging to optimize acceleration performance.
Solution Approach 2:
The control device changes ignition timing parameters based on the detected supercharging pressure level. By adapting the ignition timing angle to match the operating region, the system improves turbine response when needed while maintaining optimized acceleration performance across all regions.
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 solution reduces turbo lag and enhances acceleration performance by optimizing supercharging efficiency across all regions, ensuring rapid torque increase and smooth acceleration.
Implementation Method 1
an air-fuel ratio at which a mixture air of a scavenging gas and an exhaust gas is easily burned within an exhaust passage is provided
Data Source
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AI summary
There is provided a control device of an internal combustion engine that includes a supercharger which is driven by exhaust energy and a variable valve mechanism, the control device including: a valve timing change means that controls the variable valve mechanism; an ignition timing change means; a fuel injection amount change means; an acceleration request detection means; a supercharging pressure detection means; and an acceleration control means that corrects, when the acceleration request is detected, retarding of ignition timing in a low supercharging region where the supercharging pressure is lower than a predetermined value, that completes the correction of the retarding of the ignition timing in a high supercharging region where the supercharging pressure is equal to or higher than the predetermined value to provide a valve overlap and that changes the fuel injection amount such that an air-fuel ratio at which a mixture air of a scavenging gas and an exhaust gas is easily burned within an exhaust passage is provided.