System for virtual frost sensor
AssigneeCaterpillar Inc.
InventorJames C. Durand
Life of this patent
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Abstract
A system for a virtual frost sensor is disclosed including a method for operating the virtual frost sensor. The method includes determining a first temperature indicative of a fluid upstream of the component and determining a second temperature indicative of a fluid downstream of the component. The method also includes sensing at least one engine parameter and determining a first parameter as a function of the at least one engine parameter. The method further includes determining a third temperature indicative of a temperature associated with the engine component as a function of the first temperature, the second temperature, and the first parameter.
Claims20
A method for operating a virtual frost sensor with respect to an engine component comprising:
- determining a first temperature indicative of a fluid upstream of the component;
- determining a second temperature indicative of a fluid downstream of the component;
- sensing at least one engine parameter;
- determining a first parameter as a function of the at least one engine parameter;
- and
- determining a third temperature indicative of a temperature associated with the engine component as a function of the first temperature, the second temperature, and the first parameter.
A virtual frost sensor for an engine system having an air cooler comprising:
- first and second sensors configured to produce first and second signals indicative of first and second temperatures, respectively;
- a third sensor configured to produce a third signal indicative of at least one parameter of an engine system;
- and
- a controller configured to:
- receive the first, second, and third signals;
- and
- determine a third temperature indicative of an inner wall temperature of the air cooler as a function of the first, second, and third signals.
A method for controlling exhaust gas recirculation with respect to an engine comprising:
- sensing a first temperature indicative of ambient air downstream of an air filter;
- sensing a second temperature indicative of combustion air downstream of an air cooler;
- sensing at least one parameter indicative of an operation of the engine;
- determining a third temperature indicative of a temperature of an inner wall of the air cooler as a function of the first temperature, second temperature, and the at least one parameter;
- and
- comparing the third temperature with a predetermined temperature and selectively limiting an amount of exhaust gas recirculated from downstream of the engine to the air cooler if the third temperature is less than the predetermined temperature.
Dependencies are inferred from the claim text.