Method of monitoring emission of nitrogen oxides by an internal combustion engine
First Claim
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1. Method of monitoring the emission of nitrogen oxides, NOx, in the exhaust gas of an internal combustion engine, comprising the steps of:
- installing an accelerometer on a component delimiting a combustion chamber of a control engine analogous to the engine to be monitored,installing a known device for measuring the emission of nitrogen oxides in the exhaust gas of the control engine,operating the control engine at various loads and various speeds to cover the full operating range of the control engine,simultaneously recording data concerning an accelerometer signal, a characteristic parameter of which is calculated, the measured quantity of nitrogen oxides NOx contained in the exhaust gas of the control engine and characteristic engine operating parameters, including at least its speed, loaf and cylinder air inlet temperature,establishing, on the basis of the recorded data, a correlation between the measured quantity of nitrogen oxides and the characteristic parameter of the accelerometer signal,installing an accelerometer on the engine to be monitored subject to the same conditions as on the control engine,simultaneously recording, foe the engine to be monitored in operation, data concerning the accelerometer signal, the characteristic parameter of which is calculated, and the characteristic engine parameters including at least its speed, load and cylinder inlet air temperature,establishing, from the data recorded in the previous stage and from the correlations established for the control engine, an equivalent nitrogen oxide emission value for the engine to be monitored,taking decisions, if appropriate, as to actions needed to comply with a set point value imposed of the emission of nitrogen oxides.
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Abstract
In a method of monitoring the emission of nitrogen oxides NOx in the exhaust gas of an internal combustion engine, the engine to be monitored incorporates an accelerometer used as a sensor. The signals produced by the accelerometer are analyzed to determine the NOx concentration in the engine exhaust gas by comparison with data supplied by an accelerometer fitted to a control engine.
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9 Claims
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1. Method of monitoring the emission of nitrogen oxides, NOx, in the exhaust gas of an internal combustion engine, comprising the steps of:
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installing an accelerometer on a component delimiting a combustion chamber of a control engine analogous to the engine to be monitored, installing a known device for measuring the emission of nitrogen oxides in the exhaust gas of the control engine, operating the control engine at various loads and various speeds to cover the full operating range of the control engine, simultaneously recording data concerning an accelerometer signal, a characteristic parameter of which is calculated, the measured quantity of nitrogen oxides NOx contained in the exhaust gas of the control engine and characteristic engine operating parameters, including at least its speed, loaf and cylinder air inlet temperature, establishing, on the basis of the recorded data, a correlation between the measured quantity of nitrogen oxides and the characteristic parameter of the accelerometer signal, installing an accelerometer on the engine to be monitored subject to the same conditions as on the control engine, simultaneously recording, foe the engine to be monitored in operation, data concerning the accelerometer signal, the characteristic parameter of which is calculated, and the characteristic engine parameters including at least its speed, load and cylinder inlet air temperature, establishing, from the data recorded in the previous stage and from the correlations established for the control engine, an equivalent nitrogen oxide emission value for the engine to be monitored, taking decisions, if appropriate, as to actions needed to comply with a set point value imposed of the emission of nitrogen oxides. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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