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Passive pumping for recirculating exhaust gas

A technology of exhaust gas recirculation and exhaust gas, applied in the direction of exhaust gas recirculation, engine components, combustion engines, etc., can solve the problems of reducing efficiency and increasing the possibility of knocking

Active Publication Date: 2020-06-26
WOODWARD GOVERNOR CO
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Problems solved by technology

However, this classic method of driving EGR actually increases the knock potential by retaining residual gas and reduces efficiency by working negative pressure on the engine - in a way that reduces the amount of backlash, ie there are two steps forward to Reduces the knock of cEGR but has a step back due to how it is pumped leading to a point of zero gain where the cost of driving cEGR outweighs the benefit of delivering cEGR

Method used

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  • Passive pumping for recirculating exhaust gas
  • Passive pumping for recirculating exhaust gas

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Embodiment Construction

[0070] Exhaust gas recirculation (EGR) can have a parasitic effect on the engine system, that is, it reduces the effective power output of the engine system due to the energy required to move exhaust gases from the exhaust manifold into the intake manifold. This is particularly problematic on supercharged aspirated engines where intake manifold pressure may be higher than exhaust manifold pressure. Ironically, EGR is most needed when intake manifold pressure is high, such as when the engine is running under high load. In the case of turbocharged engines, increased back pressure in the exhaust manifold can also lead to knocking under high load.

[0071] The concepts here relate to EGR systems that can be used in internal combustion engines, including supercharged induction internal combustion engines. An injection pump is added to the engine intake system between the throttle valve and the intake manifold. If a compressor is provided in the intake system, the jet pump may be ...

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Abstract

An exhaust gas recirculation mixer includes a convergent nozzle in a flow path from an air inlet of the mixer to an outlet of the mixer. The convergent nozzle is oriented converging toward the outletof the mixer. The nozzle accelerates the flow to high velocity, which is released as a free-jet. The mixer includes an exhaust gas housing having an exhaust gas inlet into an interior of the exhaust gas housing, and a convergent-divergent nozzle having an air-fuel-exhaust gas inlet in fluid communication to receive fluid flow from the convergent nozzle (i.e., the free-jet), the interior of the exhaust gas housing, and a fuel supply into the mixer.

Description

[0001] priority statement [0002] This application claims priority to U.S. Patent Application Serial No. 15 / 714,699, filed September 25, 2017, which is incorporated herein by reference in its entirety. technical field [0003] The present application relates to exhaust gas recirculation (EGR) systems for internal combustion engines. Background technique [0004] Exhaust gas recirculation, especially cooled EGR, can be added to internal combustion engine systems to reduce NOx emissions and reduce the likelihood of knocking. In this system, a quantity of exhaust gas is added to the air and / or fuel mixture within the engine's air intake manifold. The challenge is that, especially for high efficiency engines, which are generally most efficient when the exhaust manifold pressure is lower than the intake manifold pressure, there is a cost in delivering cooled EGR (cEGR). The pressure differential creates a positive scavenging pressure differential across the engine that sweeps ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/10F02M21/04
CPCF02M21/047F02M26/10F02M26/19F02M35/10222F02M26/05F02D9/02
Inventor G·J·汉普森D·切拉
Owner WOODWARD GOVERNOR CO
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