Methods, devices, estimators, controllers and algorithms are described for estimating the torque profile of an engine and/or for controlling torque applied to a powertrain by one or more devices other than the engine itself to manage the net torque applied by the engine and other device(s) in manner
Methods, devices, estimators, controllers and algorithms are described for estimating the torque profile of an engine and/or for controlling torque applied to a powertrain by one or more devices other than the engine itself to manage the net torque applied by the engine and other device(s) in manners that reduce undesirable NVH. The described approaches are particularly well suitable for use in hybrid vehicles in which the engine is operated in a skip fire or other dynamic firing level modulation manner—however they may be used in a variety of other circumstances as well. In some embodiments, the hybrid vehicle includes a motor/generator that applies the smoothing torque.
대표청구항▼
1. A method of control of a hybrid vehicle having an internal combustion engine and an auxiliary power source/sink, the method comprising: determining a torque profile for the internal combustion engine by; determining a normalized torque profile for each stroke of a cylinder in the engine, wherein
1. A method of control of a hybrid vehicle having an internal combustion engine and an auxiliary power source/sink, the method comprising: determining a torque profile for the internal combustion engine by; determining a normalized torque profile for each stroke of a cylinder in the engine, wherein the normalized torque profile is based on intake manifold pressure;scaling the normalized torque profile to determine the cylinder torque; andsumming the cylinder torques for all cylinders in the engine to obtain an overall engine torque profile;determining whether the torque profile provides acceptable NVH;when the torque profile is determined to provide acceptable NVH, operating the hybrid vehicle solely on the output of the internal combustion engine; andwhen the torque profile is determined to provide unacceptable NVH, operating the hybrid vehicle on both the internal combustion engine and the auxiliary power source/sink, wherein the auxiliary power source/sink provides a smoothing torque to reduce NVH to an acceptable level. 2. A method as recited in claim 1 further comprising updating the torque profile profile each firing opportunity of the cylinders in the engine respectively. 3. A method as recited in claim 1 wherein acceptable NVH limit corresponds to a maximum value of instantaneous torque in the torque profile. 4. A method as recited in claim 3 wherein the maximum value of instantaneous torque varies as a function of engine speed and transmission gear. 5. A method as recited in claim 1 wherein acceptable NVH limit corresponds to a weighed RMS vibration threshold. 6. A method as recited in claim 1 performed during skip fire operation of the engine. 7. A method as recited in claim 2 wherein the scaling is based on at least one of engine speed, engine firing history, cylinder firing history, spark timing, valve timing and valve lift. 8. A method comprising: operating an engine, the engine being part of a powertrain;estimating an engine generated torque or angular acceleration profile during operation of the engine;based on the estimated torque or angular acceleration profile, identifying periods where an instantaneous torque or an instantaneous acceleration produced by the engine is expected to exceed a designated threshold, the designated threshold being an instantaneous torque threshold or an instantaneous acceleration threshold; andapplying a counteracting torque to a component of a powertrain from an energy source or sink during the identified periods such that an expected overall powertrain torque does not exceed the designated threshold, wherein the designated threshold varies as a function of engine speed and transmission gear. 9. A method as recited in claim 8 wherein the engine is operated in a skip fire manner at a current operational firing fraction having an associated firing opportunity period and each identified period corresponds to no more than the firing opportunity period. 10. A method as recited in claim 8 performed during operation of the engine in a skip fire or firing charge level modulation operational mode. 11. A method as recited in claim 8 wherein a substantial portion of energy drawn from the powertrain is returned to the powertrain within a period corresponding to a cyclic pattern associated with a current operational firing fraction. 12. A method as recited in claim 11 wherein the cyclic pattern is equal to a firing opportunity period associated with the current operational firing fraction times the denominator of the firing fraction. 13. A method of controlling an output of a powertrain that includes an engine configured to apply torque to the powertrain, the method comprising: determining an expected engine torque profile associated with a sequence of one or more engine firing opportunities;determining whether the expected engine torque profile predicts the occurrence of one or more torque spikes that exceed a designated torque spike threshold; andfor each predicted torque spike that exceeds the designated torque spike threshold, causing an opposing torque impulse to be applied to the powertrain, the opposing torque impulse being arranged to cause a net torque applied to the powertrain to not exceed the designated torque spike threshold, wherein the designated torque spike threshold varies as a function of engine speed and transmission gear. 14. A method as recited in claim 13 wherein the opposing torque is applied by a motor/generator. 15. A method as recited in claim 13 wherein the engine is operated in a skip fire manner at a current operational firing fraction having an associated firing opportunity period and each opposing torque impulse has a duration of less than the firing opportunity period. 16. A method as recited in claim 13 performed during operation of the engine in skip fire or firing charge level modulation operational mode. 17. A method of determining an operational firing fraction for delivering a desired engine output during operation of an engine, the method comprising: (a) determining an estimated torque profile associated with operating the engine at a candidate firing fraction under current engine operating conditions to deliver the desired engine output;(b) determining whether a smoothing torque would be required to meet NVH criteria during operation of the engine at the candidate firing fraction under the current engine operating conditions;(c) determining a fuel efficiency associated with the candidate firing fraction;(d) repeating steps (a)-(c) for each of a plurality of candidate firing fractions; and(e) selecting one of the candidate firing fractions as the operational firing fraction based at least in part of the determined fuel efficiency of the candidate firing fractions, wherein the fuel efficiency implications of applying the smoothing torque are considered in the determination of the fuel efficiency of each candidate firing fraction that requires a smoothing torque. 18. A method as recited in claim 17 further comprising operating the engine at the selected candidate firing fraction. 19. A method as recited in claim 17 further comprising, when a smoothing torque is required for a particular candidate firing fraction, determining whether it would be practical to apply the smoothing torque, wherein when it would not be practical to apply the smoothing torque, the candidate firing fraction is rejected from consideration as the operational firing fraction. 20. A method as recited in 17 wherein each torque profile is based at least in part on intake manifold pressure, engine speed, camshaft phase and spark timing. 21. A method as recited in claim 17 wherein: each torque profile is compared to a torque limit associated with operating the engine under the current operating conditions to determine whether a smoothing torque is required for such torque profile; andthe smoothing torque is a counteracting torque that is expected to prevent torque delivered during operation at the associated candidate firing fraction from exceeding the torque limit. 22. A method as recited in claim 17 wherein the method is performed during operation of the engine in a skip fire operational mode. 23. A method as recited in claim 17 wherein the method is performed during operation of the engine in a multi-charge level operational mode. 24. A method as recited in claim 17 wherein the candidate firing fraction selected as the operational firing fraction is the firing fraction candidate having the best fuel economy for delivering the desired engine output. 25. A method as recited in claim 21 wherein the smoothing torque is a filtered version of the torque profile. 26. A method of control of a hybrid vehicle having an internal combustion engine and an auxiliary power source/sink, the method comprising: operating the internal combustion engine in a dynamic skip fire mode, wherein for a given reduced effective displacement that is less than full displacement of the internal combustion engine, a firing decision to either fire or skip firing a cylinder of the internal combustion engine is dynamically made on a firing opportunity-by-firing opportunity basis;determining a torque profile for the internal combustion engine;determining whether the torque profile provides acceptable NVH;when the torque profile is determined to provide acceptable NVH, operating the hybrid vehicle solely on the output of the internal combustion engine; andwhen the torque profile is determined to provide unacceptable NVH while operating in the dynamic skip fire mode, operating the hybrid vehicle on both the internal combustion engine and the auxiliary power source/sink, wherein the auxiliary power source/sink provides a smoothing torque to reduce NVH to an acceptable level. 27. The method as recited in claim 26, wherein the torque profile is determined by: determining a normalized torque profile for each stroke of the cylinder in the engine, wherein the normalized torque profile is based on intake manifold pressure;scaling the normalized torque profile to determine the cylinder torque; andsumming the cylinder torques for all cylinders in the engine to obtain an overall engine torque profile. 28. The method as recited in claim 27 wherein the torque profile is updated each firing opportunity of the cylinders in the engine respectively. 29. The method as recited in claim 26, wherein acceptable NVH limit corresponds to a maximum value of instantaneous torque in the torque profile. 30. The method as recited in claim 29, wherein the maximum value of instantaneous torque varies as a function of engine speed and transmission gear. 31. The method as recited in claim 26, wherein the acceptable NVH limit corresponds to a weighed RMS vibration threshold. 32. The method as recited in claim 27 wherein the scaling is based on at least one of engine speed, engine firing history, cylinder firing history, spark timing, valve timing and valve lift.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (72)
Kim, Sung Jae; Eo, Jeong Soo, Apparatus and method for active vibration control of hybrid vehicle.
Pels Thomas,DEX ; Revermann Klaus,DEX ; Zeyen Klaus-Peter,DEX, Apparatus and methods for controlling idling speed of an internal combustion engine by reducing torque fluctuations.
Younkins, Matthew A.; Parsels, John W.; Van Ess, Joel D.; Hashemi, Siamak, Determination of a high pressure exhaust spring in a cylinder of an internal combustion engine.
Adler Uwe (Schweinfurt DEX) Drexl Hans-Jrgen (Schonungen DEX) Lutz Dieter (Schweinfurt DEX) Nagler Franz (Ottendorf DEX) Ochs Martin (Schweinfurt DEX) Schiebold Stefan (Schweinfurt DEX) Schmidt-Brcke, Drive system for a motor vehicle.
Masberg Ullrich,DEX ; Pels Thomas,DEX ; Zeyen Klaus-Peter,DEX ; Grundl Andreas,DEX ; Hoffmann Bernhard,DEX, Drive system for a motor vehicle with a drive unit and electric machine, and method of operating the system.
Ullrich Masberg DE; Thomas Pels DE; Klaus-Peter Zeyen DE; Andreas Grundl DE; Bernhard Hoffmann DE, Drive system, particularly for a motor vehicle, and process for operating it.
Wilcutts, Mark A.; Yuan, Xin; Switkes, Joshua P.; Carlson, Steven E.; Impeduglia, John F.; Parsels, John W., Drive train slip for vibration mitigation during skip fire operation.
Pirjaberi, Mohammad R.; Carlson, Steven E.; Serrano, Louis J.; Yuan, Xin; Chien, Li-Chun; Tripathi, Adya S., Firing fraction management in skip fire engine control.
Kohama Tokio (Nishio JPX) Huzino Seizi (Okazaki JPX) Obayashi Hideki (Okazaki JPX) Kawai Hisasi (Toyohashi JPX) Egami Tsuneyuki (Aichi JPX), Method and system for output control of internal combustion engine.
Zillmer,Michael; Pott,Ekkehard; Holz,Matthias, Method for operating a hybrid vehicle and hybrid vehicle with a multi-cylinder internal combustion engine coupled to an electric motor.
Loucks, Charles H.; Van Ess, Joel D.; Hashemi, Siamak; Serrano, Louis J.; Pirjaberi, Mohammad R.; Chen, Shikui Kevin; Younkins, Matthew A.; Shost, Mark A.; Wilcutts, Mark A., Misfire detection system.
Serrano, Louis J.; Yuan, Xin; Parsels, John W.; Pirjaberi, Mohammad R.; Wilcutts, Mark A.; Nagashima, Masaki, Noise, vibration and harshness reduction in a skip fire engine control system.
Peter V. Woon ; Axel O. Zur Loye ; Larry J. Brackney ; Jay F. Leonard ; Eric K. Bradley ; Terry M. Vandenberghe ; Jacqueline M. Yeager ; Julie A. Wagner ; Greg A. Moore, Operating techniques for internal combustion engines.
Kenji Nakashima JP, Parallel hybrid vehicle employing parallel hybrid system, using both internal combustion engine and electric motor generator for propulsion.
Frster Hans-Joachim (Stuttgart DEX) Lbbing Bernd-Eric (Winterbach DEX) Letsche Ulrich (Stuttgart DEX), Process and apparatus for intermittent control of a cyclically operating internal combustion engine.
Ullrich Masberg DE; Thomas Pels DE; Klaus-Peter Zeyen DE; Andreas Grundl DE; Bernhard Hoffmann DE, System for actively reducing rotational nonuniformity of a shaft, in particular, the drive shaft of an internal combustion engine, and method for this.
Wilcutts, Mark A.; Yuan, Xin; Switkes, Joshua P.; Chien, Li-Chun; Carlson, Steven E.; Chandler, Christopher W.; Hand, Christopher C.; Younkins, Matthew A.; Tripathi, Adya S., Using cylinder firing history for combustion control in a skip fire engine.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.