Gm Global Technolgoy Operations, Inc.

Andrea De Filippo

Rahul Mital

Chang H Kim

Jianwen Li

Shouxian Ren

Giuseppe Mazzara Bologna

Cristian Taibi

Andrea Dutto

Giorgio Nati

Antonino Conti

Adele De Domenico

A method is disclosed for operating a low pressure EGR valve in a low pressure EGR route of an internal combustion engine equipped with an aftertreatment system having a urea injector upstream of a Selective Catalytic Reduction on Filter (SCRF). During a regeneration procedure of the SCRF, an enabling condition is monitored for opening the low pressure EGR valve of the low pressure EGR route when enabling condition is satisfied. The enabling condition may be satisfied if a urea injection is not performed.

Method of operating a low pressure EGR valve in a low pressure EGR route of an internal combustion engine

A method of operating a Selective Catalytic Reduction on Diesel Particulate Filter or SDPF is disclosed. During a SDPF regeneration; temperature values are obtained for the SDPF inlet and SDPF outlet. The temperature values are used to calculate a rate of increase of SDPF outlet temperature and a rate of increase of SDPF inlet temperature. A ratio between the rate of increase of SDPF outlet temperature values and the rate of increase of SDPF inlet temperature values is calculated, and if the ratio is greater than a threshold thereof, the exhaust gas composition is modified in some manner.

Method of operating a selective catalytic reduction on filter of an automotive system

A method is disclosed of providing a fuel efficient regeneration of an exhaust after-treatment (AT) system that includes a lean oxides of nitrogen (NO) trap (LNT) and a selective catalytic reduction filter (SCRF) positioned downstream of the LNT. The method includes regulating a selectable position valve. The valve permits a first gas flow portion to pass through the LNT and diverts a remaining second portion of exhaust gas flow from a first passage connecting an engine and the AT system to a second exhaust passage to thereby bypass the LNT. The method also includes regulating a first device to inject fuel into the first portion of the exhaust gas flow. The injection of fuel in to the first portion of the exhaust gas flow provides fuel efficient regeneration of the LNT and promotes NOconversion and ammonia (NH) formation in the LNT. A system employing the method is also disclosed.

[object Object]

An after-treatment (AT) system for an exhaust gas flow from an internal combustion engine includes an AT device and an exhaust passage carrying the exhaust gas flow from the engine to the AT device. The system also includes a heat exchanger in fluid communication with the exhaust passage upstream of the AT device and configured to remove heat energy from the exhaust gas flow. The system additionally includes an exhaust gas flow bypass in fluid communication with the exhaust passage and configured to route the exhaust gas flow from the exhaust passage to the AT device around, i.e., in bypass of, the heat exchanger. Furthermore, the system includes a bypass valve configured to selectively direct the exhaust gas flow to one of the heat exchanger and the exhaust gas flow bypass. A vehicle employing the AT system and a method of operating such an AT system are also disclosed.

Exhaust after-treatment device conversion efficiency optimization

An internal combustion engine includes an aftertreatment device, an injector for injecting fuel into a cylinder and an Electronic Control Unit configured to perform a regeneration process of the aftertreatment device. The regeneration process includes determining a nominal fuel quantity to be injected by an after-injection; monitoring a temperature value of the aftertreatment device; determining a fuel quantity correction value, as a function of a difference between the monitored temperature value and a target temperature value of the aftertreatment device; correcting the nominal fuel quantity value, using the fuel quantity correction value, in order to determine a corrected fuel quantity value; performing a fuel injection cycle including a plurality of after-injections; and injecting the corrected fuel quantity value into the cylinder during one of the after-injections of the cycle.

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Piemonte, Italy

Andrea De Filippo