Device and method for regenerating an exhaust gas aftertreatment device
AssigneeFord Global Technologies, LLC
InventorsJohannes Kuenstler, Paul Eduard Moraal, Urs Christen, Yasser M. Yacoub
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Abstract
The invention relates to a method for regenerating a particulate filter in the exhaust system of a diesel engine, an increase in the temperature of the exhaust gases being brought about by post-injection of fuel. The intake pressure (MAP) and/or the air mass flow rate (MAF) are reduced as a function of the ambient temperature of the engine and preferably also when the engine load is low by throttling the engine. In this way, the proportions of burned or unburned post-injected fuel can be stabilized.
Claims21
A method for regenerating an exhaust gas aftertreatment device disposed in the exhaust system of an internal combustion engine, the engine having a throttle valve disposed in the engine intake and a fuel injector disposed in a combustion cylinder of the engine configured for multiple injections during a combustion cycle, comprising:
- injecting fuel into the combustion cylinder at least twice in a single engine cycle, said injections including a main injection followed by a post injection;
- and
- regulating a position of the throttle valve to provide a desired value of an exhaust gas parameter wherein said regulation is based on an estimated ambient temperature.
A method for regenerating an exhaust gas aftertreatment device disposed in the exhaust system of an internal combustion engine, the engine having a throttle valve disposed in the engine intake and a fuel injector disposed in a combustion cylinder of the engine configured multiple injections during a combustion cycle, comprising:
- injecting fuel into the combustion cylinder at least twice in a single engine cycle, said injections including a main injection followed by a post injection;
- and
- regulating a position of the throttle valve to provide a desired value of an exhaust gas parameter wherein the position of the throttle valve is regulated so that temperature in the combustion cylinder does not drop below a predetermined threshold at the time of said post injection.
An internal combustion engine, comprising:
- an exhaust gas aftertreatment device arranged in an engine exhaust;
- a throttle valve disposed in an engine intake;
- a fuel injector disposed in each of engine combustion cylinders, said injector providing a main injection followed by a post injection, said injections occurring within a single engine cycle;
- and
- an electronic control unit operably connected to the engine, said electronic control unit adjusting a timing of said post injected fuel and a position of said throttle valve to provide a desired value of an exhaust ass parameter wherein said desired value of said exhaust gas parameter leads to regeneration of said exhaust ass aftertreatment device wherein said throttle valve is adjusted to provide a predetermined intake manifold pressure.
A method for regenerating a particulate filter disposed in the exhaust system of a diesel engine, the engine having a throttle valve disposed in the engine intake and a fuel injector disposed in a combustion cylinder of the engine configured for multiple injections during a combustion cycle, comprising:
- injecting fuel into the combustion cylinder at least twice in a single engine cycle, said injections including a main injection followed by a post injection;
- and
- determining a desired input value for an engine intake parameter to provide a desired output value of an engine exhaust parameter;
- basing said desired input value on an estimated ambient temperature;
- and
- regulating a position of the throttle valve to provide said desired output value.
An internal combustion engine, comprising:
- an exhaust gas aftertreatment device arranged in an engine exhaust;
- a throttle valve disposed in an engine intake;
- a fuel injector disposed in each of engine combustion cylinders, said injector providing a main injection followed by a post injection, said injections occurring within a single engine cycle;
- and
- an electronic control unit operably connected to the engine, said electronic control unit adjusting a position of said throttle valve to provide a desired value of an exhaust gas parameter and to provide a predetermined intake manifold pressure wherein said desired value of said exhaust gas parameter leads to regeneration of said exhaust gas aftertreatment.
An internal combustion engine, comprising:
- an exhaust gas aftertreatment device arranged in an engine exhaust;
- a throttle valve disposed in an engine intake;
- a fuel injector disposed in each of engine combustion cylinders, said injector providing a main injection followed by a post injection, said injections occurring within a single engine cycle;
- and
- an electronic control unit operably connected to the engine, said electronic control unit adjusting a position of said throttle valve to provide a desired value of an exhaust gas parameter and to provide a predetermined intake mass airflow wherein said desired value of said exhaust gas parameter leads to regeneration of said exhaust gas aftertreatment.
Dependencies are inferred from the claim text.