System for controlling particulate filter temperature
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Accused Products
Abstract
A system for controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine includes a controller responsive to volumetric flow and temperature of exhaust gas to determine a filter regeneration parameter. In a hybrid electric-engine vehicle application, various control strategies are implemented as a function of the regeneration parameter to control exhaust gas temperature suitably for proper regeneration of the particulate filter. Such strategies include shifting the duty cycle of the engine toward lower engine speed operation along lines of constant power output, modifying the ratio of electrical power and engine power and controlling recharging of the battery supplying electrical energy to the vehicle'"'"'s electric drive motor under vehicle deceleration conditions. In vehicle applications including a transmission coupled directly to the engine, shift points of the transmission are modified as a function of the regeneration parameter to control exhaust gas temperature.
46 Citations
75 Claims
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1-16. -16. (canceled)
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17. System for controlling particulate filter temperature, the system comprising:
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an internal combustion engine producing exhaust gas at an exhaust gas outlet;
a particulate filter having a filter inlet fluidly coupled to said exhaust gas outlet and a filter outlet;
means for determining a volumetric flow rate of said exhaust gas entering said filter inlet;
means for determining a pressure differential between said filter inlet and said filter outlet;
a transmission coupled to said engine, said transmission including a number of automatically selectable gear ratios, and a control circuit determining a regeneration parameter as a function of said pressure differential and said volumetric flow rate, said control circuit controlling automatic shifting of said transmission as a function of said regeneration parameter. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34-41. -41. (cancelled)
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42. System for controlling particulate filter temperature. the system comprising:
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an internal combustion engine producing exhaust gas at an exhaust gas outlet;
a particulate filter having a filter inlet fluidly coupled to said exhaust outlet and a filter outlet;
a transmission coupled to said engine and including a number of selectable gear ratios;
means for determining a temperature of said particulate filter; and
a control circuit controlling rotational speed of said engine between an idle speed and a maximum speed, said control circuit increasing said idle speed from a first idle speed value to a second higher idle speed value if said temperature of said particulate filter exceeds a first temperature to thereby cool said particulate filter by increasing exhaust gas flow therethrough and decreasing said idle speed from said second idle speed value back to said first idle speed value if said temperature of said particulate filter drops below a second temperature less than said first temperature, said control circuit operable to either of log a fault code within a memory in communication with said control circuit and activate a warning indicator if said temperature of said particulate filter exceeds a third temperature greater than said first temperature. - View Dependent Claims (43)
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44-47. -47. (cancelled)
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48. System for controlling particulate filter temperature, the system comprising:
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an internal combustion engine producing exhaust gas at an exhaust gas outlet;
a particulate filter having a filter inlet fluidly coupled to said exhaust outlet and a filter outlet;
means for determining a temperature of said particulate filter;
a transmission coupled to said engine and having a number of automatically selectable gear ratios; and
a control circuit responsive to said temperature of said particulate filter exceeding a first temperature to command automatic shifting of said transmission according to a shift schedule having higher engine speed shift points than those of a default engine speed shift point schedule, said engine resultantly operating at higher engine speeds with correspondingly higher exhaust gas flow through said particulate filter to thereby cool said particulate filter. - View Dependent Claims (49, 51, 52, 53, 54)
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50. (canceled)
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55. A method of controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine coupled to a transmission having a number of automatically selectable gear ratios, the method comprising the steps of:
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determining a temperature of the particulate filter; and
commanding automatic shifting of the transmission according to a shift schedule having higher engine speed shift points than those of a default engine speed shift point schedule if the temperature of the particulate filter exceeds a first temperature, resulting in the engine operating at higher engine speeds with correspondingly higher exhaust gas flow through the particulate filter to thereby cool the particulate filter. - View Dependent Claims (56, 57)
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58. A method of controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine coupled to a transmission having a number of automatically selectable gear ratios, the method comprising the steps of
determining a volumetric flow rate of said exhaust gas entering said filter inlet; -
determining a pressure differential between said filter inlet and said filter outlet;
determining a regeneration parameter as a function of said pressure differential and said volumetric flow rate; and
controlling automatic shifting of said transmission as a function of said regeneration parameter. - View Dependent Claims (59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73)
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74. System for controlling particulate filter temperature, the system comprising:
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a particulate filter receiving exhaust gas produced by an internal combustion engine;
a transmission coupled to said engine and having a number of automatically selectable gear ratios;
means for determining a volumetric flow rate of said exhaust gas received by said particulate filter;
means for determining a pressure differential of said exhaust gas across said particulate filter; and
a control circuit controlling the particulate filter temperature by controlling temperature of said exhaust gas, the control circuit controlling the temperature of said exhaust gas by controlling engine speed shift points of said transmission as a function of said volumetric flow rate and of said pressure differential.
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75. A method for controlling the temperature of a particulate filter receiving exhaust gas produced by an internal combustion engine coupled to a transmission having a number of selectable gear ratios, the method comprising:
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determining a volumetric flow rate of the exhaust gas received by the particulate filter;
means for determining a pressure differential of the exhaust gas across the particulate filter; and
controlling the temperature of the particulate filter by controlling engine speed shift points of the transmission as a function of the volumetric flow rate and of the pressure differential.
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Specification