Ozone converting catalyst fault identification systems and methods
AssigneeGM Global Technology Operations LLC
InventorsEtsuko Muraji Stewart, Scott H. Wittkopp, Stuart R. Smith
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Abstract
A system for a vehicle includes a conversion efficiency module, a threshold determination module, and a catalyst fault indication module. The conversion efficiency module generates an ozone conversion efficiency of a catalyst that converts ozone into oxygen based on a first amount of ozone in air measured upstream of the catalyst and a second amount of ozone in air measured downstream of the catalyst. The threshold determination module generates an efficiency threshold based on ambient humidity. The catalyst fault indication module selectively indicates that a fault is present in the catalyst when the ozone conversion efficiency is less than the efficiency threshold.
Claims20
A system for a vehicle, comprising:
- a conversion efficiency module that generates an ozone conversion efficiency of a catalyst that converts ozone into oxygen based on a first amount of ozone in air measured upstream of the catalyst and a second amount of ozone in air measured downstream of the catalyst;
- a threshold determination module that generates an efficiency threshold based on ambient humidity;
- and
- a catalyst fault indication module that selectively indicates that a fault is present in the catalyst when the ozone conversion efficiency is less than the efficiency threshold.
A method for a vehicle, comprising:
- generating, using a conversion efficiency module, an ozone conversion efficiency of a catalyst that converts ozone into oxygen based on a first amount of ozone in air measured upstream of the catalyst and a second amount of ozone in air measured downstream of the catalyst;
- generating, using a threshold determination module, an efficiency threshold based on ambient humidity;
- and
- selectively indicating, using a catalyst fault indication module, that a fault is present in the catalyst when the ozone conversion efficiency is less than the efficiency threshold.
A vehicle comprising:
- a catalyst that converts ozone into oxygen and that is applied to a heat exchanger of the vehicle;
- a first ozone sensor that measures a first amount of ozone in air upstream of the catalyst;
- a second ozone sensor that measures a second amount of ozone in air downstream of the catalyst;
- and
- an engine control module (ECM) including:
- a conversion efficiency module that generates an ozone conversion efficiency of the catalyst based on the first amount of ozone upstream of the catalyst and the second amount of ozone downstream of the catalyst;
- a threshold determination module that generates an efficiency threshold based on ambient humidity;
- and
- a catalyst fault indication module that selectively indicates that a fault is present in the catalyst when the ozone conversion efficiency is less than the efficiency threshold.
Dependencies are inferred from the claim text.