| Patent application number | Description | Published |
|---|
| 20100083639 | Apparatus and Method for Optimizing Exhaust Temperature Control in a Vehicle During Particulate Filter Regneration - A method controls an exhaust gas temperature from a vehicle engine during regeneration of particulate filter (PF) in a vehicle having an oxidation catalyst (OC) and a selective catalytic reduction catalyst (SCR). The method ensures that a final OC temperature does not exceed a maximum of the target OC outlet temperature and a calibrated maximum OC outlet temperature. An apparatus for controlling a temperature of the exhaust gas includes sensors for measuring a temperature within the exhaust system and a controller having an algorithm, an OC temperature lookup table, and a PF temperature lookup table. The algorithm calculates a target OC outlet temperature using the lookup tables and a delayed error value that compensates for a thermal mass of the SCR. Actual OC outlet temperature is limited during regeneration of the PF to the lesser of the target OC outlet temperature and a calibrated maximum OC outlet temperature. | 04-08-2010 |
| 20100212417 | EXHAUST TREATMENT DIAGNOSTIC SYSTEM AND METHOD - A method and system for monitoring operation of an exhaust treatment system of a diesel engine includes a dosing system including an injector for injecting an injection fluid and a pump for pressurizing the injection fluid. The system also includes a pressure sensor in communication with the dosing system generating a pressure signal. The system further includes a control module that determines a pressure error signal in response to the pressure signal and generates a fault signal in response. | 08-26-2010 |
| 20100223910 | ENVIRONMENTAL FACTOR BASED PARTICULATE FILTER REGENERATION - A control module for a vehicle includes a correction module that generates a correction signal based on a regeneration state of an exhaust system of the vehicle and based on a received environmental signal. The environmental signal includes at least one of an altitude value, an ambient temperature, and an air flow value. The air flow value corresponds to air flow across an external area of the exhaust system. A first post injection module generates a first post injection signal. A second post injection module adjusts the first post injection signal based on the correction signal to generate a second post injection signal. | 09-09-2010 |
| 20100300074 | EXHAUST HYDROCARBON INJECTION CONTROL SYSTEM AND METHOD - A system comprises an injection control module and a fuel film module. The injection control module controls a flow rate of fuel injected into an exhaust system to adjust a temperature of exhaust gas. The fuel film module determines an accumulation rate of fuel on a surface of the exhaust system based on the flow rate of the fuel. The fuel film module determines a release rate of fuel from the surface of the exhaust system based on a flow rate of the exhaust gas. The injection control module adjusts the flow rate of the fuel based on the accumulation rate and the release rate. | 12-02-2010 |
| 20110030348 | SYSTEM AND METHODS FOR CONTROLLING SELECTIVE CATALYTIC REDUCTION SYSTEMS - An engine system includes an aging factor generation module, a temperature comparison module, and a mode control module. The aging factor generation module generates an aging factor that indicates deterioration of a catalyst in a selective catalytic reduction (SCR) system. The temperature comparison module compares inlet and outlet temperatures of the SCR system to predetermined effective inlet and outlet temperatures of the SCR system, respectively, wherein the predetermined effective inlet and outlet temperatures are based on the aging factor. The mode control module controls at least one of a throttle and a plurality of fuel injectors based on a first predetermined air/fuel (A/F) ratio when the inlet and outlet temperatures of the SCR system are greater than the predetermined effective inlet and outlet temperatures of the SCR system, respectively. | 02-10-2011 |
| 20110041477 | SYSTEM AND METHOD FOR CONTROLLING REDUCING AGENT INJECTION IN A SELECTIVE CATALYTIC REDUCTION SYSTEM - An engine control system includes a dosing control module and an offset determination module. The dosing control module actuates an injector to inject a first amount of reducing agent into exhaust gas produced by an engine during a period when a temperature of the exhaust gas is greater than a predetermined temperature threshold. The offset determination module determines an efficiency of a selective catalytic reduction (SCR) material based on measured amounts of nitrogen oxide (NOx) during the period and expected NOx amounts, wherein the measured amounts of NOx are measured at locations upstream and downstream from the SCR material, and wherein the expected NOx amounts are based on the temperature of the exhaust gas and the first amount of reducing agent. | 02-24-2011 |
| 20110107741 | EXHAUST GAS OXYGEN CONCENTRATION CONTROL SYSTEM AND METHOD - An engine control system comprises an oxygen comparison module and a regeneration control module. The oxygen comparison module compares an oxygen concentration of an exhaust gas of an engine to an oxygen threshold. A regeneration control module initiates regeneration of a particulate filter and controls regeneration based on the oxygen comparison and at least one of a particulate filter load, a particulate filter temperature, and a speed of the engine. | 05-12-2011 |
| 20110314793 | SYSTEM AND METHOD FOR DETERMINING AN AGE OF AND CONTROLLING A SELECTIVE CATALYTIC REDUCTION CATALYST - An exhaust treatment system for exhaust gas produced by an engine includes a condition control module, a load determination module, and an age determination module. The condition control module decreases a load on a selective catalytic reduction (SCR) catalyst below a predetermined load threshold and increases exhaust gas temperature (EGT) to a predetermined temperature. The load determination module increases injection of a dosing agent into the exhaust gas and determines a load on the SCR catalyst when dosing agent is detected downstream from the SCR catalyst. The age determination module determines an age of the SCR catalyst based the determined load and predetermined loads for first and second SCR catalysts, respectively. | 12-29-2011 |
