Detecting leakage of engine exhaust gas using exhaust mass...

Details Detecting leakage of engine exhaust gas using exhaust mass... Detecting leakage of engine exhaust gas using exhaust mass...

2006-01-31

2006-01-31

Dolinar, Andrew M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C073S118040

Reexamination Certificate

active

06993428

ABSTRACT:
An internal combustion engine has cylinders within which combustion occurs and an exhaust system through which products of combustion are exhausted from the cylinders. A temperature sensor and an electric heater are disposed in temperature sensing relation to the exhaust gas flow. A processor develops temperature data obtained from the temperature sensor, and power data representing power required to heat the electric heater to a temperature in excess of temperature of exhaust gas flow past the heater. The processor processes the temperature data, the power data, and data representing mass flow through the engine upstream of the temperature sensor and heater according to an algorithm for yielding data representing difference between mass flow of exhaust gas past the temperature sensor and heater and mass flow upstream of the temperature sensor and heater. The measurement may then be used to measure leakage from the exhaust system by subtracting it from flow measurement in a different location.

REFERENCES:
patent: 4399698 (1983-08-01), Hiromasa et al.
patent: 5708585 (1998-01-01), Kushion
Ganseman, Chris and Joe Griffin, “EGR Mass Flow Sensor”, EPIQ Sensor-Nite, Jan. 29, 2002 and Feb. 11, 2002.

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