Noise suppression system and method
a technology of noise suppression and suppression system, applied in the direction of fuel intake silencer, combustion air/fuel air treatment, charge feed system, etc., can solve the problems of significant increase in induction noise, significant disadvantage of throttleless engine, and induction noise that cannot be significantly reduced, so as to suppress induction noise, suppress induction noise, and limit induction noise
Inactive Publication Date: 2005-09-01
FORD GLOBAL TECH LLC
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Benefits of technology
The patent describes a system and method for controlling the noise generated by an engine. The system includes two venturis that provide air to the engine, and a valve that can limit the air flow through one or both of the venturis. This allows for precise control of the air flow and simultaneous reduction of noise. The system can also include a larger and smaller venturi, with the larger venturi being closed during low engine air requirement operations to further suppress noise. Overall, the system helps to create a quieter engine while still meeting its air requirements.
Problems solved by technology
However, the inventors herein have recognized a potential disadvantage of throttleless engines.
Specifically, induction noise can be significantly greater when a throttle is not present.
This is particularly true at low engine speeds, where traditional throttled designs have had a substantially closed throttle plate that reflects induction noise.
Throttleless engines have a substantially unobstructed passage to the combustion chamber, which can significantly increase induction noise.
Furthermore, the actuation of the electronic valves themselves may increase induction noise, thereby exacerbating induction noise issues.
Method used
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[0015]FIG. 1 shows an exemplary internal combustion engine 10, which can be used to power a vehicle such as a car or a truck. Engine 10 can include a plurality of cylinders, an exemplary one of which is shown at 12 of FIG. 1. Cylinder 12 includes a combustion chamber 14 that is partially defined by cylinder walls 16 and reciprocating piston 18. Cylinder 12 also includes intake valve 20, exhaust valve 22, fuel injector 24, and spark plug 26. Fuel injector 24 can be configured to spray fuel directly into combustion chamber 14 or the fuel injector can be aimed into an inlet air passage. In some embodiments, a cylinder may include two or more fuel injectors, which can be configured to inject fuel into different areas and / or two or more spark plugs, which can be used to facilitate complete combustion by initiating two flame fronts. Furthermore, it is within the scope of this disclosure to utilize two or more intake valves and / or exhaust valves.
[0016] Combustion chamber 14 is an area whe...
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A noise suppression assembly includes a first venturi configured to provide air to a combustion chamber and a second venturi configured to provide air to the combustion chamber. The noise suppression assembly also includes a valve subsystem configured to selectively limit air flow through at least one of the first venturi and the second venturi.
Description
BACKGROUND OF THE INVENTION [0001] Internal combustion engines have traditionally utilized a throttle to regulate airflow to the combustion chamber of a cylinder. Improvements in electronic engine control have enabled the intake and exhaust valves of the cylinder to control airflow, thereby eliminating the need for a traditional throttle. Such engines are commonly referred to as electronic valve actuated engines and / or throttleless engines. Throttleless engines can demonstrate improved performance, fuel economy, transient response, combustion stability, and emissions when compared to conventionally throttled engines. [0002] However, the inventors herein have recognized a potential disadvantage of throttleless engines. Specifically, induction noise can be significantly greater when a throttle is not present. This is particularly true at low engine speeds, where traditional throttled designs have had a substantially closed throttle plate that reflects induction noise. Throttleless eng...
Claims
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IPC IPC(8): F01N1/00F01N7/00F01N13/10F02M35/12
CPCF02M35/1211F02M35/1288F02M35/1222
Inventor BOZZI, LLOYDKHOSLA, SUNNY R.
Owner FORD GLOBAL TECH LLC