Method and device for regulating the NO.sub.x emission of an internal combustion engine
First Claim
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1. Method for regulating an internal combustion engine by adjusting of an air/fuel ratio as a function of operating conditions of said engine, the output of said engine being measured, said method comprising:
- determining a desired efficiency of said engine under said operating conditions;
measuring an efficiency under said operating conditions, andaltering the air/fuel ratio of an air/fuel mixture in such a way that the desired and measured efficiencies are equal, the air/fuel ratio being reduced if the measured efficiency is higher than the desired efficiency.
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Abstract
Method and device for regulating the NOx emission of an internal combustion engine. It has been found that the NOx emission is dependent on the efficiency of the engine. That is to say the NOx emission can be optimized by determining and controlling the efficiency. This can be performed by making the measured and determined efficiencies equal to one another by altering the air/fuel ratio.
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14 Claims
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1. Method for regulating an internal combustion engine by adjusting of an air/fuel ratio as a function of operating conditions of said engine, the output of said engine being measured, said method comprising:
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determining a desired efficiency of said engine under said operating conditions; measuring an efficiency under said operating conditions, and altering the air/fuel ratio of an air/fuel mixture in such a way that the desired and measured efficiencies are equal, the air/fuel ratio being reduced if the measured efficiency is higher than the desired efficiency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Device for regulating a combustion engine comprising means for measuring the engine output, memory storage means, comparison means, computing means and also means for changing an air/fuel ratio controlled by the comparison means, wherein
the memory storage means stores a desired efficiency of said engine, the computing means determine a measured efficiency as a function of a quantity of air/fuel mixture introduced and the comparison means become operative in the event of a difference between said measured and said desired efficiencies.
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