Diagnosing oxidation catalyst device with hydrocarbon storage
AssigneeGM Global Technology Operations LLC
InventorsChang H. Kim, Michelle H. Wiebenga, Vincent J. Tylutki, David B. Brown, Igor Anilovich, Rahul Mital
Life of this patent
Estimating the term…
Abstract
A method for diagnosing an Oxidation Catalyst (OC) device of an exhaust gas treatment system is provided. The method monitors a differential temperature across the OC device. The method determines whether the differential temperature reveals a temperature spike. The method determines that the OC device operates properly in response to determining that the differential temperature reveals a temperature spike.
Claims18
A method for diagnosing an Oxidation Catalyst (OC) device of an exhaust gas treatment system of a vehicle, the method comprising:
- monitoring a differential temperature across the OC device including a zeolite component for storing hydrocarbons before a temperature of the OC device reaches an operating temperature of the OC device;
- determining, by a control module of the exhaust gas treatment system, whether the differential temperature reveals a temperature spike;
- determining, by the control module, whether the zeolite component has depleted from the OC device based on the temperature spike so to diagnose whether the OC device operates properly;
- and
- outputting an electronic control signal to an indicator installed on the vehicle, and invoking the indicator in response to the control signal to notify an operator of the vehicle that the OC device is operating improperly due to the depletion of the zeolite component.
A diagnostic system, comprising:
- an Oxidation Catalyst (OC) device disposed in an exhaust gas treatment system of a vehicle;
- an in-vehicle indicator installed on the vehicle;
- and
- a control module configured to:
- monitor a differential temperature across the OC device including a zeolite component for storing hydrocarbons before a temperature of the OC device reaches an operating temperature of the OC device;
- determine whether the differential temperature reveals a temperature spike;
- determine whether the zeolite component has depleted from the OC device based on the temperature spike so to diagnose whether the OC device operates properly;
- and
- output an electronic control signal to an indicator installed on the vehicle, and invoking the indicator in response to the control signal to notify an operator of the vehicle that the OC device is operating improperly due to the depletion of the zeolite component.
An exhaust gas treatment system for an engine of a vehicle, comprising:
- an Oxidation Catalyst (OC) device disposed in an exhaust gas treatment system and including a zeolite component for storing hydrocarbons before a temperature of the OC device reaches an operating temperature of the OC device;
- a first temperature sensor disposed upstream of the OC device;
- a second temperature sensor disposed downstream of the OC device;
- and
- a control module configured to:
- determine a differential temperature across the OC device based on temperatures sensed by the first and second temperature sensors;
- determine whether the differential temperature reveals a temperature spike;
- and
- determine whether the zeolite component has depleted from the OC device based on the temperature spike so to diagnose whether the OC device operates properly.
Dependencies are inferred from the claim text.