Method and system for controlling temperatures of exhaust gases emitted from internal combustion engine to facilitate regeneration of a particulate filter
AssigneeDetroit Diesel Corporation
InventorsOliver Warner, Admir Kreso, Michael Balnaves
Life of this patent
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Abstract
Method, system, and controller for controlling exhaust gas temperatures by adjusting exhaust valve timing and/or fueling for one or more cylinders wherein normal operating cylinders receive additional fuel to compensate for the adjusted cylinders, thereby increasing exhaust gas temperatures. The method, system, and controller may be applicable in systems having an engine which emits exhaust gases having particulates which are captured by the particulate filter.
Claims20
A method for controlling temperatures of exhaust gases emitted from an internal combustion engine to facilitate regeneration of a particulate filter being in fluid communication therewith, the internal combustion engine having a number of cylinders for internal combustion which emit exhaust gases, a doser being in fluid communication with the particulate filter for injecting fuel into the exhaust gases, an oxidation catalyst (OC) being in fluid communication with the particulate filter for burning the fuel injected by the doser, the method comprising:
- determining a desired exhaust gas temperature at the doser to facilitate vaporization of the fuel injected by the doser so that the vaporized fuel is delivered to the OC where it oxidizes to increase the temperature of the exhaust gases which in turn oxidize the particulates captured by the particulate filter, the desired exhaust gas temperature at the doser being greater than an exhaust gas temperature of exhaust gases emitted from the engine when all cylinders are fueled;
- and
- controlling the engine to emit gases at the desired exhaust gas temperature for improved fuel vaporization by changing exhaust valve events for at least one exhaust valve of at least one cylinder to compress and discharge gas to the doser before expansion and increasing fueling of the remaining cylinders having normal valve events to maintain engine speed or output power.
A method for controlling temperatures of exhaust gases emitted from an internal combustion engine to facilitate regeneration of particulates captured with a particulate filter, the internal combustion engine having a number of cylinders for internal combustion which emit exhaust gases to the particulate filter, the method comprising:
- determining a desired exhaust gas temperature to facilitate regeneration of the particulates captured with the particulate filter, the desired exhaust gas temperature being greater than an exhaust gas temperature of exhaust gases emitted from the engine when each cylinder is fueled;
- and
- controlling the engine to emit gases at the desired exhaust gas temperature by controlling at least one exhaust valve of at least one of the cylinders.
A controller for controlling temperatures of exhaust gases emitted from an internal combustion engine to facilitate regeneration of particulates captured with a particulate filter, the internal combustion engine having a number of cylinders for internal combustion which emit exhaust gases to the particulate filter, the controller configured for:
- determining a desired exhaust gas temperature to facilitate regeneration of the particulates captured with the particulate filter, the desired exhaust gas temperature being greater than an exhaust gas temperature of exhaust gases emitted from the engine when each cylinder is fueled;
- and
- controlling the engine to emit gases at the desired exhaust gas temperature by controlling at least one exhaust valve of at least one of the cylinders.
The controller of claim 18 further configured for at least one of opening an exhaust valve during a compression stroke to increase the temperature of the emitted exhaust gases;
- delaying opening of an exhaust valve during an exhaust stroke to increase the temperature of the emitted exhaust gases;
- or opening an exhaust valve during an expansion stroke to increase the temperature of the emitted exhaust gases.
A system for regeneration a particulate filter, the system comprising
- an engine having a number of cylinders for internal combustion which emit exhaust gases;
- one or more injection and valve mechanisms in communication with one or more cylinders of the engine;
- and
- a controller in communication with the injection mechanism for controlling the engine to operate with one or more unfueled cylinders and with one or more cylinders having adjusted exhaust valve timing events as a function of a desired regeneration exhaust gas temperature so as to control the engine to emit exhaust gases sufficient for regeneration.
Dependencies are inferred from the claim text.