Method for three zone diesel oxidation catalyst light off control system
AssigneeDetroit Diesel Corporation
InventorJeffrey M. Girbach
Life of this patent
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Abstract
A method to regenerate a diesel particulate filter in an exhaust system with a fuel doser for normal and transient vehicle travel. The vehicle may be equipped with an electronically controlled compression ignition engine with an electronic control unit having memory and capable of receiving data signals from remote senor indicative of vehicle operating conditions.
Claims14
A method to regenerate a diesel oxidation catalyst in an exhaust system with a fuel doser for normal and transient vehicle travel;
- said vehicle equipped with an electronically controlled compression ignition engine with an electronic control unit having memory and for receiving data signals from remote senor indicative of vehicle operating conditions;
- determining exhaust gas flow temperature at the diesel oxidation catalyst inlet;
- determining whether the exhaust gas temperature at the diesel oxidation catalyst inlet exceeds a first predetermined temperature value for a first predetermined period of time;
- dosing the exhaust system at the diesel oxidation catalyst inlet with a quantity of fuel based upon the exhaust gas flow temperature to regenerate a diesel particulate filter;
- determining whether the exhaust gas temperature at the diesel oxidation catalyst inlet exceeds a second, predetermined temperature for a second predetermined period of time, the second predetermined temperature being lower than the first predetermined temperature;
- determining whether the exhaust temperature at the DOC inlet exceeds a second predetermined temperature for less than a second predetermined period of time, wherein if the temperature at the DOC inlet exceeds the second predetermined temperature for less than the second predetermined period of time, the method suspends regeneration and continues normal engine operation;
- dosing the exhaust system at the diesel oxidation catalyst inlet with a quantity of fuel for up to a second predetermined period of time.
A method to determine operation mode of a vehicle having a compression ignition engine with an exhaust system including a fuel doser and a diesel oxidation catalyst, said engine equipped with an electronic control unit with memory, said electronic control unit for receiving data input signals from remote sensors indicative of operating conditions, said method comprising:
- determining exhaust gas temperature at the diesel oxidation catalyst inlet;
- determining whether the exhaust gas temperature at the diesel oxidation catalyst inlet exceeds a first predetermined temperature for a first predetermined period of time;
- determining whether the exhaust gas temperature at the diesel oxidation catalyst inlet exceed a second predetermined temperature for a second predetermined period of time, wherein the diesel oxidation catalyst inlet first predetermined exhaust gas temperature is greater than the second predetermined exhaust gas temperature;
- determining the vehicle operation mode based upon the temperature at the diesel oxidation catalyst for a predetermined period of time;
- dosing the exhaust gas stream at the diesel oxidation catalyst with a quantity of fuel based upon the mode of vehicle travel to regenerate the diesel particulate filter.
Dependencies are inferred from the claim text.