Vehicle Control Apparatus Knocking Suppression
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Solution Overview
Problem
Existing vehicle control systems fail to effectively suppress knocking and reduce carbon monoxide emissions when operating at theoretical air-fuel ratios across all engine regions, leading to increased exhaust CO levels and potential engine damage.
Innovation Solution
A vehicle control apparatus and method that includes a supercharger, spark plug, variable valve apparatus, and controller, which adjust ignition timing and intake valve closing timing based on engine operating regions to prevent knocking, while maintaining theoretical air-fuel ratios, by retarding ignition timing, advancing intake valve closing, and increasing supercharging pressure as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rich burn is performed to suppress knocking in high load region, then knocking margin is secured and exhaust temperature is reduced, but carbon monoxide emission is increased excessively
Solution Approach 1:
The system dynamically changes the air-fuel ratio parameter based on engine operating conditions. In high load regions, it transitions from theoretical air-fuel ratio to rich burn to suppress knocking, while in low load regions it maintains theoretical air-fuel ratio to minimize CO emissions. This parameter adaptation resolves the contradiction between knocking suppression and CO emission reduction.
Solution Approach 2:
The air-fuel ratio is made dynamic rather than fixed, allowing the engine control system to adjust between theoretical and rich burn modes based on real-time operating conditions. This dynamic adjustment enables the system to optimize both knocking suppression and emission control across different operating regions.
2Object-generated harmful factors
If theoretical air-fuel ratio is used in all operating regions, then carbon monoxide emission is reduced, but knocking cannot be suppressed in high load region
Solution Approach 1:
The system changes the air-fuel ratio parameter from fixed theoretical ratio to a variable ratio that becomes richer in high load regions. This parameter transformation allows the system to maintain low CO emissions in most operating regions while enabling knocking suppression when needed in high load conditions.
3Power
If rich burn is performed to reduce exhaust temperature and prevent engine damage, then engine output is increased, but carbon monoxide exhaust amount is increased excessively
Solution Approach 1:
The air-fuel ratio parameter is adjusted dynamically based on load conditions. Rich burn is applied selectively in high load regions where it provides the benefits of reduced exhaust temperature and increased engine output, while theoretical air-fuel ratio is maintained in lower load regions to minimize CO emissions. This conditional parameter change resolves the contradiction between power enhancement and emission 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
This approach effectively suppresses knocking and reduces carbon monoxide emissions by dynamically adjusting engine parameters, ensuring efficient combustion and minimizing exhaust CO levels across all engine operating regions.
Implementation Method 1
a supercharger configured to supply compressed air to a the combustion chamber of the engine
Implementation Method 2
an spark plug configured to ignite mixed air supplied to the combustion chamber
Implementation Method 3
a variable valve apparatus configured to adjust an opening timing and closing timing of the intake valve
Data Source
AI summary
An apparatus of controlling a vehicle and a method thereof are provided. The operating region of an engine is operated with theoretical air-fuel ratio. The apparatus includes a supercharger that supplies compressed air to a the combustion chamber of the engine and a spark plug that ignites mixed air supplied to the combustion chamber. An intake valve selectively opens and closes the combustion chamber for inflowing the mixed air therein. A variable valve apparatus adjusts an opening timing and closing timing of the intake valve and a controller adjusts an ignition timing of the spark plug and the closing timing of the intake valve through the variable valve apparatus based on the operating region of the engine.