Exhaust and component temperature estimation systems and methods
AssigneeGM Global Technology Operations LLC
InventorPatrick Barasa
Life of this patent
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Abstract
An exhaust control system comprises a nominal specific heat module, a correction module, a specific heat determination module, and a convective loss estimation module. The nominal specific heat module determines a nominal specific heat of exhaust input to a component of an exhaust system based on a temperature of the exhaust input to the component and based on a predetermined oxygen content. The correction module determines a specific heat correction based on an oxygen content measured by a sensor. The specific heat determination module determines a specific heat of the exhaust based on the nominal specific heat and the specific heat correction. The convection loss estimation module estimates a convective energy loss rate associated with the component based on the specific heat.
Claims20
An exhaust control system comprising:
- a nominal specific heat module that determines a nominal specific heat of exhaust input to a component of an exhaust system based on a temperature of the exhaust input to the component and based on a predetermined oxygen content;
- a correction module that determines a specific heat correction based on an oxygen content measured by a sensor;
- a specific heat determination module that determines a specific heat of the exhaust based on the nominal specific heat and the specific heat correction;
- and
- a convection loss estimation module that estimates a convective energy loss rate associated with the component based on the specific heat.
An exhaust control method comprising:
- determining a nominal specific heat of exhaust input to a component of an exhaust system based on a temperature of the exhaust input to the component and based on a predetermined oxygen content;
- determining a specific heat correction based on an oxygen content measured by a sensor;
- determining a specific heat of the exhaust based on the nominal specific heat and the specific heat correction;
- and
- estimating a convective energy loss rate associated with the component based on the specific heat.
Dependencies are inferred from the claim text.