| 摘要 |
<p>The present invention concerns a system for regulating the fuel-air mixture in a multi-cylinder internal combustion engine (1), a sensor combination for a similar system, and a process for determining the mixture of fuel and air in an internal combustion engine. Only by using a single sensor arranged in the exhaust gas piping after the exhaust gases from a multi-cylinder internal combustion engine have been combined, can a cylinder by cylinder regulation of the fuel-air mixture take place. The present invention utilises a sensor (10) with a binary output signal, i.e. that provides a signal switching between two signal levels. With a rapid-acting sensor that is sensitive to HC can be determined for each individual combustion event whether the combustion has taken place with an excess of fuel, i.e. a net reducing mixture in the exhaust gases, and the relative excess amount of fuel. The relative excess amount of fuel is proportional to the state, i.e. the pulse width, of the signal level that is indicating the level of the excess fuel. The present invention permits the fuel supply to each individual cylinder to be regulated more closely, so that stoichiometric combustion can be maintained during continuous operation, whether the operation is under constant load or during transients.</p> |
