The method may comprise estimating an operating condition of the turbocharger, determining a maximum value of an operating parameter as a function of the estimated operating condition of the turbocharger, measuring a value of the operating parameter, determining {HEAD ~ an error value} as {TAIL ~ a function} of the maximum value of the first operating parameter and the measured value of the operating parameter, and limiting fuel supplied to the engine based on the error value 
The method may comprise estimating an operating condition of the turbocharger , determining a maximum value of an operating parameter as a function of the estimated operating condition of the turbocharger , measuring a value of the operating parameter , determining { HEAD ~ an error value } as { TAIL ~ a function } of the maximum value of the first operating parameter and the measured value of the operating parameter , and limiting fuel supplied to the engine based on the error value
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