Exhaust flow calibration apparatus and method
AssigneeDaimlerChrysler AG
InventorsDennis M Blumke, Majed S Marji
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Abstract
A method and apparatus calibrates an exhaust gas measurement system for a motor vehicle. The method includes the steps of providing a flow of air to the exhaust gas measurement system having a known flow rate, measuring and storing a signal output from the exhaust gas measurement system, repeating the first two steps a predetermined plurality number of times, calculating a calibration curve based on the known flow rates and the stored signal; and using the calibration curve in the exhaust gas measurement system.
Claims17
A method for calibration of an exhaust gas flow measurement system for a motor vehicle, including the steps of:
- providing a flow of air to the exhaust gas flow measurement system having a known flow rate;
- measuring and storing a signal indicative of air flow output from the exhaust gas flow measurement system;
- repeating the first two steps a predetermined plurality number of times;
- calculating a calibration curve based on the known flow rates and the stored signal;
- and
- using the calibration curve in the exhaust gas flow measurement system.
An exhaust flow calibration unit for calibration of an exhaust flow measurement device, the calibration unit comprising:
- an air flow circuit to provide a known air flow rate;
- and
- a central processing unit in communication with said air flow circuit, said central processing unit storing data corresponding to said known air flow rate and a signal output from said exhaust flow measurement device in response to said known air flow rate and calculating a calibration curve therefrom.
Dependencies are inferred from the claim text.