The EGR conduit (32) is provided with an EGR valve (34), an EGR scrubber (36), and an EGR blower (38).
The method further includes controlling an EGR flow rate with the EGR valve at relatively closed EGR valve positions, and controlling the EGR flow rate with exhaust pressure at relatively open EGR valve positions.
An EGR valve position control system includes an EGR valve manager responsive to an EGR valve command to drive an EGR valve actuator.
The engine further comprises a variable geometry EGR turbine (17) located on the EGR line (12), driven by the EGR gas flowing in the EGR line (12).
An external EGR device (21) comprises an EGR passage (21a) connected to the exhaust passage at one end and connected to the intake passage at the other end and an EGR valve (21b) capable of opening and closing the EGR passage.
One embodiment of the invention may include a method of controlling exhaust gas recirculation (EGR) in a turbocharged compression-ignition engine system including a high pressure (HP) EGR path and a low pressure (LP) EGR path.
An EGR valve (213) is in fluid communication with the EGR cooler (211), and a purge valve (205) is in fluid communication with the EGR cooler (211) and the outlet of the turbine (203).
Also, ejecting the liquid ammonia toward the EGR gas within a flow path (84) for recirculation can facilitate the cooling of the EGR gas required when recirculating the EGR gas to the intake air.
Provided is an EGR device in which an EGR gas passage and a cooling water passage for cooling EGR gas can be configured using a reduced number of parts.
Examples: PC NA, DI TCA EGR.