초록 ▼

A method of controlling an internal combustion engine that includes an exhaust line fitted with a particulate filter, the method including: a) acquiring a charge parameter relating to a fill level of the particulate filter, b) comparing the charge parameter with at least one determined threshold, an

A method of controlling an internal combustion engine that includes an exhaust line fitted with a particulate filter, the method including: a) acquiring a charge parameter relating to a fill level of the particulate filter, b) comparing the charge parameter with at least one determined threshold, and c) bringing the internal combustion engine to a set operating point determined as a function of various criteria of differing levels of importance. Prior to c) and with one of the criteria being the mass flow rate of particles entering the particulate filter, a constraint level coefficient is determined as a function of the result of the comparing b) and applied to the particulate mass flow rate to weight importance of this criterion in determining the engine operating point. Thus, the engine is controlled taking account of the fill level of the particulate filter, making it possible to optimize a compromise between constraint on the particulate flow rate through the exhaust line and other engine control constraints.

대표청구항 ▼

1. A method of controlling an internal combustion engine including an exhaust line fitted with a particulate filter, comprising: acquiring a fill rate of the particulate filter;comparing, simultaneously, the fill rate with at least two determined thresholds;when the fill rate is less than the two de

1. A method of controlling an internal combustion engine including an exhaust line fitted with a particulate filter, comprising: acquiring a fill rate of the particulate filter;comparing, simultaneously, the fill rate with at least two determined thresholds;when the fill rate is less than the two determined thresholds, controlling the internal combustion engine at a first operating point such that a flow rate of particulates emitted from cylinders of the engine is not modified;when the fill rate is greater than the two determined thresholds, controlling the internal combustion engine at a second operating point such that the flow rate of particulates emitted from the cylinders of the engine is reduced;when the fill rate is between the two determined thresholds, determining an autonomy parameter and a probability parameter, the autonomy parameter being based on a calculated distance or duration available for regenerating the particulate filter with the fill rate between the two determined thresholds and the probability parameter being based on an estimated distance or duration needed to find running conditions suitable for regenerating the particulate filter;when the autonomy parameter is greater than the probability parameter, controlling the internal combustion engine at the first operating point; andwhen the autonomy parameter is less than the probability parameter, controlling the internal combustion engine at the second operating point. 2. The control method as claimed in claim 1, in which the autonomy parameter is calculated according to a charge parameter or an average charge speed of the particulate filter or a distance covered since a last active regeneration of the particulate filter or a duration that has elapsed since the last active regeneration of the particulate filter or a fill rate band within which the particulate filter can be regenerated in favorable regeneration conditions. 3. The control method as claimed in claim 1, in which the probability parameter is calculated according to a distance covered or a duration that has passed since a last instant when the running conditions were suitable for the regeneration of the particulate filter, and an average distance or an average duration between two instants when the running conditions are suitable for the regeneration of the particulate filter. 4. The control method as claimed in claim 3, in which the probability parameter is also calculated according to a minimum threshold distance or a minimum threshold duration between two active regenerations of the particulate filter. 5. The control method as claimed in claim 1, in which each threshold has a predetermined fixed value. 6. The control method as claimed in claim 1, in which each threshold has a variable value. 7. The control method as claimed in claim 6, in which the variable value is deduced from usual conditions of use of the internal combustion engine. 8. The control method as claimed in claim 1, in which the constraint level varies continuously or in levels. 9. An internal combustion engine comprising: cylinders;a line for intake of fresh air into the cylinders;means of injecting fuel into the cylinders;an exhaust line for burnt gases from the cylinders which is fitted with a particulate filter; anda control unit for controlling flow rates of fresh air and fuel injected into the cylinders,wherein the control unit is configured to be capable of implementing:acquiring a fill rate of the particulate filter;comparing, simultaneously, the fill rate with at least two determined thresholds;when the fill rate is less than the two determined thresholds, controlling the internal combustion engine at a first operating point such that a flow rate of particulates emitted from cylinders of the engine is not modified;when the fill rate is greater than the two determined thresholds, controlling the internal combustion engine at a second operating point such that the flow rate of particulates emitted from the cylinders of the engine is reduced;when the fill rate is between the two determined thresholds, determining an autonomy parameter and a probability parameter, the autonomy parameter being based on a calculated distance or duration available for regenerating the particulate filter with the fill rate between the two determined thresholds and the probability parameter being based on an estimated distance or duration needed to find running conditions suitable for regenerating the particulate filter;when the autonomy parameter is greater than the probability parameter, controlling the internal combustion engine at the first operating point; andwhen the autonomy parameter is less than the probability parameter, controlling the internal combustion engine at the second operating point. 10. The control method as claimed in claim 1, in which the two determined thresholds are 30% and 90%, respectively. 11. The control method as claimed in claim 1, in which the two determined thresholds includes a first determined threshold that varies between 20 and 40% and a second determined threshold that varies between 80 and 90%. 12. The control method as claimed in claim 1, further comprising: determining a running profile of the vehicle,wherein the two determined thresholds are determined from the running profile of the vehicle. 13. The control method as claimed in claim 1, in which the determining the autonomy parameter and the probability parameter is performed after the comparing, simultaneously, the fill rate with the at least two determined thresholds.