Oxidation catalyst/hydrocarbon injector testing system
AssigneeGM Global Technology Operations LLC
InventorsJanean E. Kowalkowski, Chad E. Marlett, Vincent J. Tylutki, Yun Xiao, Umar Z. Khan
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Abstract
An oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system includes a controller having a first oxygen sensor input configured and disposed to receive a first oxygen sensor value upstream of an oxidation catalyst (OC) device and a second oxygen sensor input configured to receive a second oxygen sensor value downstream of the OC device. The controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values.
Claims20
An oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system comprising:
- a controller including a first oxygen sensor input configured and disposed to receive a first oxygen sensor value upstream of an oxidation catalyst (OC) device and a second oxygen sensor input configured to receive a second oxygen sensor value downstream of the OC device, wherein the controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values.
An exhaust system for a motor vehicle comprising:
- a hydrocarbon injector (HCI) configured to introduce hydrocarbons into the exhaust system;
- an oxidation catalyst (OC) device arranged downstream of the HCI;
- a first oxygen sensor arranged upstream of the OC device;
- a second oxygen sensor arranged downstream of the OC device;
- and
- an oxidation catalyst (OC)/hydrocarbon injector (HCI) testing system comprising:
- a controller including a first oxygen sensor input operatively connected to the first oxygen sensor, the first oxygen sensor input being configured and disposed to receive a first oxygen sensor value and a second oxygen sensor input operatively connected to the second oxygen sensor, the second oxygen sensor input being configured to receive a second oxygen sensor value, wherein the controller is configured and disposed to perform a first test to detect one of a faulty OC device and a faulty HCI based on a difference between the first and second oxygen sensor values.
A method of monitoring an oxidation catalyst (OC) device and a hydrocarbon injector (HCI) in an exhaust system, the method comprising:
- sensing a first oxygen sensor value at a first oxygen sensor arranged upstream of the OC device;
- sensing a second oxygen sensor value at a second oxygen sensor arranged downstream of the OC device;
- calculating a difference between the first oxygen sensor value and the second oxygen sensor value;
- and
- performing a first test to determine whether one of the OC device and the HCI is faulty based on the difference between the first oxygen sensor value and the second oxygen sensor value.
Dependencies are inferred from the claim text.