# US 2014/0150408 A1 · Integrated load bank and exhaust heater system with load shed capability for a diesel genset exhaust aftertreatment system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0150408 A1 - Document ID: US20140150408A1 - Status: Published application - Kind: A1 - Application number: 13/706,309 - Filed: 2012-12-05 - Published: 2014-06-05 - Earliest claimed: 2012-12-05 - Assignees: Cummins Cal Pacific, LLC - Inventors: Herman Van Niekerk; Eric G. Wiemers; Mark Yragui - Web page: https://patentgrep.com/patent/US20140150408A1 ## CPC - F01N 3/2013: {using electric or magnetic heating means} - F01N 3/027: using electric or magnetic heating means - F01N 3/2066: {Selective catalytic reduction [SCR]} - F01N 9/00: Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) - F01N 9/002: {of filter regeneration} - F01N 2590/10: for stationary applications - F01N 2900/0422: measuring the elapsed time - Y02T 10/12: Improving ICE efficiencies - Y02T 10/40: Engine management systems - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An integrated load bank and exhaust heater for a diesel genset exhaust aftertreatment system of the type having a diesel particulate filter (DPF) and a selective catalytic reduction (SCR) section. The load bank/heater can function as a load bank when testing the genset, as a heat source to optimize SCR efficiency, as to thermally regenerate the DPF filter. ## Claims ### Claim 1 A method for operating a control system to control the distribution of power from a genset having an output power capacity to an electrical load powered by the genset and to a load bank/heater in an exhaust after treatment (AT) system coupled to the genset, the method including: applying power from the genset to the electrical load; applying power from the genset to the load bank/heater to heat exhaust from the genset; monitoring power demand on the genset while applying power to the electrical load and the load bank/heater; and reducing the amount of power applied to the load bank/heater when the monitored power demand on the genset is greater than a selected output power capacity or the genset output power capacity. ### Claim 2 (depends on 1) The method of claim 1 wherein reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater by at least an amount about equal to an amount that the power demand on the genset exceeds the genset output power capacity or the selected output capacity. ### Claim 3 (depends on 2) The method of claim 2 wherein reducing the amount of power applied to the load bank/heater includes discontinuing the application of power to the load bank/heater when the amount of power demanded by the electrical load about equals or exceeds the genset output power capacity or the selected output capacity. ### Claim 4 (depends on 1) The method of claim 1 wherein reducing the amount of power applied to the load bank/heater includes discontinuing the application of power to the load bank/heater when the amount of power demanded by the electrical load about equals or exceeds the genset output power capacity of the selected output capacity. ### Claim 5 (depends on 1) The method claim 1 wherein: applying power to the load bank/heater includes applying power to the load bank/heater during a genset test when the genset is disconnected from the electrical load; and reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater during the genset test when the exhaust temperature exceeds a selected limit. ### Claim 6 (depends on 1) The method of claim 1 wherein: applying power to the load bank/heater includes applying power to the load bank/heater during operation in a diesel particulate filter (DPF) regeneration mode; and reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater during the DPF filter regeneration mode when the electrical load demands power during the DPF filter regeneration mode. ### Claim 7 (depends on 1) The method of claim 1 wherein: applying power to the load bank/heater includes applying power to the load bank/heater during operation in an AT run mode; and reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater during the AT run mode when the electrical load demands power during the AT run mode. ### Claim 8 (depends on 1) The method of claim 1 wherein reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater when the electrical load increases its demand power at a high rate of change. ### Claim 9 (depends on 8) The method of claim 8 wherein the high rate of change for power demand is determined with a differential or second order differential of the increase in power demand. ### Claim 10 (depends on 1) The method of claim 1 wherein reducing the amount of power applied to the load bank/heater includes reducing the amount of power applied to the load bank/heater and not restoring it until one of a selected time window has expired and an electrical demand at a selected lower hysteresis level has been attained. ### Claim 11 An exhaust after treatment system for use with a genset having an output power capacity coupled to an electrical load, including: a load bank/heater configured to be powered by the genset and to heat exhaust from the genset; a power sensor to monitor power demand on the genset; and a control system coupled to the load bank/heater and the power sensor, to control the amount of power applied to the load bank/heater and to reduce the amount of power applied to the load bank/heater when the monitored power demand on the genset is greater than the genset output power capacity or exceeds a selected limit. ### Claim 12 (depends on 11) The exhaust after treatment system of claim 11 wherein the control system reduces the amount of power applied to the load bank/heater by at least an amount about equal to an amount that the power demand on the genset exceeds the genset output power capacity or the selected limit. ### Claim 13 (depends on 12) The exhaust after treatment system of claim 12 wherein the control system discontinues the application of power to the load bank/heater when the amount of power demanded by the electrical load exceeds the genset output power capacity or the selected limit. ### Claim 14 (depends on 11) The exhaust after treatment system of claim 11 wherein the control system discontinues the application of power to the load bank/heater when the amount of power demanded by the electrical load exceeds the genset output power capacity or the selected limit. ### Claim 15 (depends on 1) The exhaust after treatment system of claim 1 wherein the control system includes: a switch coupling power from the genset to the load bank/heater; and a controller coupled to the switch and the power sensor, to control the switch.