초록 ▼

A control system for an internal combustion engine for driving a vehicle, which controls an output torque of the engine, is provided. In this control system, a rapid change in a demand torque of the engine is detected, and a feedforward correction amount is generated during a correction period which

A control system for an internal combustion engine for driving a vehicle, which controls an output torque of the engine, is provided. In this control system, a rapid change in a demand torque of the engine is detected, and a feedforward correction amount is generated during a correction period which is substantially equal to a resonance period of a powertrain of the vehicle, from a time when the rapid change in the demand torque is detected. An output torque control amount of the engine is corrected with the feedforward correction amount. A torque change amount integrated value is calculated by integrating an amount of change in the demand torque, and the feedforward correction amount is generated according to the torque change amount integrated value.

대표청구항 ▼

1. A control system for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control system comprising: torque change detecting means for detecting a rapid change in a demand torque of said engine;feedforward correction amount generating means for

1. A control system for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control system comprising: torque change detecting means for detecting a rapid change in a demand torque of said engine;feedforward correction amount generating means for generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle, from a time when the rapid change in the demand torque is detected; andfeedforward torque correcting means for correcting an output torque control amount of said engine with the feedforward correction amount. 2. The control system according to claim 1, wherein said feedforward correction amount generating means generates the feedforward correction amount so that the output torque control amount is corrected in a direction opposite to a direction of the change in the demand torque from a time when the rapid change in the demand torque is detected, to a half-period elapsed time when a time period which is substantially equal to a half of the resonance period has elapsed, and the output torque control amount is corrected in a direction equal to the direction of the change in the demand torque after the half-period elapsed time. 3. The control system according to claim 1, wherein said feedforward correction amount generating means calculates a torque change amount integrated value by integrating an amount of change in the demand torque, and generates the feedforward correction amount according to the torque change amount integrated value. 4. The control system according to claim 1, wherein said feedforward correction amount generating means calculates the feedforward correction amount according to a direction of change in the demand torque. 5. A control system for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control system comprising: rotational speed detecting means for detecting a rotational speed of said engine;high-pass filtering means for performing a high-pass filtering of the detected engine rotational speed, wherein a cutoff frequency of the high-pass filtering is set to a frequency lower than a resonance frequency of a powertrain of the vehicle; andfeedback torque correcting means for correcting an output torque control amount of said engine in a feedback manner according to the high-pass filtered engine rotational speed. 6. The control system according to claim 5, wherein said feedback torque correcting means corrects the output torque control amount so that the high-pass filtered engine rotational speed becomes “0”. 7. The control system according to claim 5, further comprising timing correcting means for performing a timing correction of the high-pass filtered engine rotational speed, wherein said feedback torque correcting means corrects the output torque control amount according to the engine rotational speed corrected by said timing correcting means. 8. The control system according to claim 7, wherein said timing correcting means performs the timing correction according to a phase advance caused by the high-pass filtering, a detection delay of said rotational speed detecting means, and a torque change delay which corresponds to a time period from a change in the output torque control amount to a change in the output torque of said engine caused by the change in the output torque control amount. 9. The control system according to claim 8, wherein said timing correcting means calculates an advance time period corresponding to the phase advance caused by the high-pass filtering, according to a gear ratio of a transmission connected to an output shaft of said engine, and performs the timing correction using the calculated advance time period. 10. The control system according to claim 5, wherein said feedback torque correcting means sets a gain of the feedback correction according to a gear ratio of a transmission connected to an output shaft of said engine and an intake air flow rate of said engine. 11. The control system according to claim 5, further comprising inhibiting means for inhibiting a fuel cut operation in which a fuel supply to said engine is stopped, when the feedback torque correcting means corrects the output torque control amount in a direction of increasing the output torque. 12. The control system according to claim 5, further comprising torque change detecting means for detecting a rapid change in a demand torque of said engine: feedforward correction amount generating means for generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle from a time when the rapid change in the demand torque is detected; andfeedforward torque correcting means for correcting the output torque control amount with the feedforward correction amount. 13. A control system for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control system comprising: torque change detecting means for detecting a rapid change in a demand torque of said engine;feedforward correction amount generating means for generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle from a time when the rapid change in the demand torque is detected;feedforward torque correcting means for correcting a first output torque control amount of said engine with the feedforward correction amount;rotational speed detecting means for detecting a rotational speed of said engine;high-pass filtering means for performing a high-pass filtering of the detected engine rotational speed; andfeedback torque correcting means for correcting a second output torque control amount of said engine in a feedback manner according to the high-pass filtered engine rotational speed. 14. A control method for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control method comprising the steps of: a) detecting a rapid change in a demand torque of said engine;b) generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle, from a time when the rapid change in the demand torque is detected; andc) correcting an output torque control amount of said engine with the feedforward correction amount. 15. The control method according to claim 14, wherein the feedforward correction amount is generated so that the output torque control amount is corrected in a direction opposite to a direction of the change in the demand torque from a time when the rapid change in the demand torque is detected, to a half-period elapsed time when a time period which is substantially equal to a half of the resonance period has elapsed, and the output torque control amount is corrected in a direction equal to the direction of the change in the demand torque after the half-period elapsed time. 16. The control method according to claim 14, wherein a torque change amount integrated value is calculated by integrating an amount of change in the demand torque, and the feedforward correction amount is generated according to the torque change amount integrated value. 17. The control method according to claim 14, wherein the feedforward correction amount is calculated according to a direction of change in the demand torque. 18. A control method for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control method comprising the steps of: a) detecting a rotational speed of said engine;b) performing a high-pass filtering of the detected engine rotational speed, wherein a cutoff frequency of the high-pass filtering is set to a frequency lower than a resonance frequency of a powertrain of the vehicle; andc) correcting an output torque control amount of said engine in a feedback manner according to the high-pass filtered engine rotational speed. 19. The control method according to claim 18, wherein the output torque control amount is corrected so that the high-pass filtered engine rotational speed becomes “0”. 20. The control method according to claim 18, further comprising the step of d) performing a timing correction of the high-pass filtered engine rotational speed, wherein the output torque control amount is corrected according to the timing-corrected engine rotational speed. 21. The control method according to claim 20, wherein the timing correction is performed according to a phase advance caused by the high-pass filtering, a detection delay in the detection of the engine rotational speed, and a torque change delay which corresponds to a time period from a change in the output torque control amount to a change in the output torque of said engine caused by the change in the output torque control amount. 22. The control method according to claim 21, wherein an advance time period corresponding to the phase advance caused by the high-pass filtering, is calculated according to a gear ratio of a transmission connected to an output shaft of said engine, and the timing correction is performed using the calculated advance time period. 23. The control method according to claim 18, wherein a gain of the feedback correction is set according to a gear ratio of a transmission connected to an output shaft of said engine and an intake air flow rate of said engine. 24. The control method according to claim 18, further comprising the step of e) inhibiting a fuel cut operation in which a fuel supply to said engine is stopped, when the output torque control amount is corrected in a direction of increasing the output torque. 25. The control method according to claim 18, further comprising the steps of f) detecting a rapid change in a demand torque of said engine:g) generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle from a time when the rapid change in the demand torque is detected; andh) correcting the output torque control amount with the feedforward correction amount. 26. A control method for an internal combustion engine for driving a vehicle, which controls an output torque of said engine, said control method comprising the steps of: a) detecting a rapid change in a demand torque of said engine;b) generating a feedforward correction amount during a correction period which is substantially equal to a resonance period of a powertrain of said vehicle from a time when the rapid change in the demand torque is detected;c) correcting a first output torque control amount of said engine with the feedforward correction amount;d) detecting a rotational speed of said engine;e) performing a high-pass filtering of the detected engine rotational speed; andf) correcting a second output torque control amount of said engine in a feedback manner according to the high-pass filtered engine rotational speed.