| 摘要 |
The invention relates to the adjustment of the cylinder 21, 22, 23, 24 air/ fuel ratio for the optimisation of combustion in an internal combustion engine of a motor vehicle. It involves measurement of a crank angle on a crankshaft 3 to determine the point in the combustion cycle at which to take or select scanned lambda probe 8 measurements of the combustion products. These are combined with global lambda values in a computer model such as an exhaust gas pressure or exhaust gas back pressure model to calculate an effective combustion lambda. The crank angle detection may take place or be selected when no scavenging air flow is visible in the exhaust gas flow. The scavenging air flow may also be calculated. The effective combustion lambda may be compared to a set point value and a correction value calculated when a deviation occurs. The scanned lambda probe signal may be filtered and statistically evaluated. The computer may send signals to a control unit to adjust the cylinder air-gas mixture. Lambda probe 8 measurements may be taken for each cylinder 21, 22, 23, 24 and an effective combustion lambda may be calculated for each individual cylinder. |
