System for controlling particulate filter temperature
First Claim
1. System for controlling particulate filter temperature, the system comprising:
- an internal combustion engine producing exhaust gas at an exhaust outlet;
a particulate filter having a filter inlet fluidly coupled to said exhaust outlet and a filter outlet;
means for determining a pressure differential between said filter inlet and said filter outlet;
means for determining a volumetric flow rate of said exhaust gas entering said filter inlet; and
a control circuit determining a regeneration parameter as a function of said pressure differential and said volumetric flow rate, said control circuit controlling temperature of said particulate filter as a function of said regeneration parameter.
1 Assignment
0 Petitions
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.
-
Citations
57 Claims
-
1. System for controlling particulate filter temperature, the system comprising:
-
an internal combustion engine producing exhaust gas at an exhaust outlet;
a particulate filter having a filter inlet fluidly coupled to said exhaust outlet and a filter outlet;
means for determining a pressure differential between said filter inlet and said filter outlet;
means for determining a volumetric flow rate of said exhaust gas entering said filter inlet; and
a control circuit determining a regeneration parameter as a function of said pressure differential and said volumetric flow rate, said control circuit controlling temperature of said particulate filter as a function of said regeneration parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
-
34. A method of controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine, the method comprising the steps of:
-
determining a pressure differential across the particulate filter;
determining a volumetric flow rate of exhaust gas entering the particulate filter;
determining a regeneration parameter as a function of the pressure differential and the volumetric flow rate; and
controlling temperature of the particulate filter as a function of the regeneration parameter.
-
-
35. System for controlling particulate filter temperature, the system comprising:
-
an internal combustion engine producing exhaust gas at an exhaust gas outlet;
a particulate filter having an filter inlet fluidly coupled to said exhaust outlet and a filter outlet;
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 if said temperature of said particulate filter exceeds a first temperature to thereby cool said particulate filter by increasing exhaust gas flow therethrough. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. A method of controlling the temperature of a particulate filter coupled to an exhaust outlet of an internal combustion engine operating at rotational speeds between an idle speed and a maximum speed, the method comprising the steps of:
-
determining a temperature of the particulate filter; and
increasing the idle speed if the temperature of the particulate filter exceeds a first temperature to thereby cool the particulate filter by increasing a flow rate of engine exhaust gas therethrough. - View Dependent Claims (45, 46, 47)
-
-
48. System for controlling particulate filter temperature, the system comprising:
-
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, 50, 51, 52, 53, 54)
-
-
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:
-
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)
-
Specification