Particulate filter regeneration post-injection fuel rate control
AssigneeGM Global Technology Operations LLC
InventorNicasio Gomez, III
Life of this patent
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Abstract
A control system for a vehicle includes a mode determination module that selects one of a first post-injection mode and a second post-injection mode based on a regeneration enable signal and a particulate filter temperature signal. An adjustment module selects one of N ramp rate tables based on the selected one of the first post-injection mode and the second post-injection mode. N is an integer greater than 1. The adjustment module generates a post-injected fuel signal based on the selected one of the N ramp rate tables, an ambient temperature signal and the particulate filter temperature signal. The adjustment module outputs the post-injected fuel signal to a fuel injection system.
Claims24
A control system for a vehicle comprising:
- a first electronic circuit configured to select one of a first post-injection mode and a second post-injection mode based on a regeneration enable signal and a particulate filter (PF) temperature signal, wherein post-injected fuel is supplied to a fuel injection system during both of the first post-injection mode and the second post-injection mode;
- and
- a second electronic circuit configured to select one of N ramp rate tables based on the selected one of the first post-injection mode and the second post-injection mode and generate a post-injected fuel signal based on the selected one of the N ramp rate tables, an ambient temperature signal and the PF temperature signal, wherein the post-injected fuel signal is generated to control a ramp-up rate of an amount of post-injection fuel to be supplied via the fuel injection system, and where N is an integer greater than 1,
- wherein the second electronic circuit is configured to output the post-injected fuel signal to the fuel injection system, wherein the post-injected fuel signal indicates the amount of post-injection fuel to be supplied via the fuel injection system,
- wherein the second electronic circuit does not limit an amount of post-injection fuel supplied via the fuel injection system while operating in the first post-injection mode and based on a first one of the N ramp rate tables, and is configured to limit an amount of post-injection fuel supplied via the fuel injection system while operating in the second post-injection mode based on a second one of the N ramp rate tables.
A post-injection method for an exhaust system of a vehicle comprising:
- selecting one of a first post-injection mode and a second post-injection mode based on a regeneration enable signal and a particulate filter (PF) temperature signal, wherein post-injected fuel is supplied to a fuel injection system during both of the first post-injection mode and the second post-injection mode;
- selecting one of N ramp rate tables based on the selected one of the first post-injection mode and the second post-injection mode, where N is an integer greater than 1;
- based on the selected one of the N ramp rate tables, an ambient temperature signal and the PF temperature signal, generating a post-injected fuel signal to control a ramp-up rate of an amount of post-injection fuel to be supplied via the fuel injection system;
- outputting the post-injected fuel signal to the fuel injection system, wherein the post-injected fuel signal indicates the amount of post-injection fuel to be supplied via the fuel injection system;
- not limiting the amount of post-injection fuel supplied via the fuel injection system while operating in the first post-injection mode based on a first one of the N ramp rate tables;
- and
- limiting the amount of post-injection fuel supplied via the fuel injection system while operating in the second post-injection mode based on a second one of the N ramp rate tables.
Dependencies are inferred from the claim text.