Adaptive torque mitigation by micro-hybrid system
First Claim
1. A powertrain controller for operating an internal combustion engine in a dynamic firing level modulation manner using an operational effective firing fraction that is fuel efficient and has acceptable noise, vibration and harshness (NVH) characteristics, the powertrain controller comprising:
- a firing fraction calculator arranged to generate an operational effective firing fraction to deliver a requested engine torque; and
a firing determination timing module that is arranged to generate a firing sequence used to operate the engine in a dynamic firing level modulation manner, the firing sequence being based on the operational effective firing fraction;
wherein the powertrain controller uses an adaptive filter feed forward controller that is arranged to determine a smoothing torque that is applied to a powertrain by an energy storage/capture/release device,wherein the smoothing torque is arranged to at least partially cancel out a variation in torque generated by the firing sequence, thereby reducing NVH that would otherwise be generated by the firing sequence.
1 Assignment
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Accused Products
Abstract
A variety of methods and arrangements for reducing noise, vibration and harshness (NVH) in a skip fire engine control system are described. In one aspect, a firing sequence is used to operate the engine in a dynamic firing level modulation manner. A smoothing torque is determined by adaptive control that is applied to a powertrain by an energy storage/release device. The smoothing torque is arranged to at least partially cancel out variation in torque generated by the firing sequence. Various methods, powertrain controllers, arrangements and computer software related to the above operations are also described.
153 Citations
38 Claims
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1. A powertrain controller for operating an internal combustion engine in a dynamic firing level modulation manner using an operational effective firing fraction that is fuel efficient and has acceptable noise, vibration and harshness (NVH) characteristics, the powertrain controller comprising:
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a firing fraction calculator arranged to generate an operational effective firing fraction to deliver a requested engine torque; and a firing determination timing module that is arranged to generate a firing sequence used to operate the engine in a dynamic firing level modulation manner, the firing sequence being based on the operational effective firing fraction; wherein the powertrain controller uses an adaptive filter feed forward controller that is arranged to determine a smoothing torque that is applied to a powertrain by an energy storage/capture/release device, wherein the smoothing torque is arranged to at least partially cancel out a variation in torque generated by the firing sequence, thereby reducing NVH that would otherwise be generated by the firing sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for operating an internal combustion engine in a dynamic firing level manner using an operational effective firing fraction that is fuel efficient and has acceptable noise, vibration and harshness (NVH) characteristics, the method comprising:
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generating an operational firing fraction to deliver a requested engine torque; generating a firing sequence used to operate the engine in a dynamic firing level modulation manner, the firing sequence being based on the operational effective firing fraction; determining, via adaptive filter feed forward control, a smoothing torque that is applied to a powertrain by an energy storage/capture/release device wherein the smoothing torque is arranged to at least partially cancel out variations in torque generated by the firing sequence, thereby reducing NVH that would otherwise be generated by the firing sequence. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A computer readable storage medium that includes executable computer code embodied in a tangible form and suitable for operating an internal combustion engine in a dynamic firing level modulation manner using an operational effective firing fraction that is fuel efficient and has acceptable noise, vibration and harshness (NVH) characteristics wherein the computer readable medium includes:
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executable computer code for generating an operational effective firing fraction to deliver a requested torque; executable computer code for generating a firing sequence used to operate the engine in a dynamic firing level modulation manner, the firing sequence being based on the operational effective firing fraction; and executable computer code for determining, via adaptive filter feed forward control, a smoothing torque that is applied to a powertrain by an energy storage/capture/release device wherein the smoothing torque is arranged to at least partially cancel out variations in torque generated by the firing sequence, thereby reducing NVH that would otherwise be generated by the firing sequence. - View Dependent Claims (33)
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34. A powertrain controller for operating an internal combustion engine in a dynamic firing level modulation manner using an operational effective firing fraction that is fuel efficient and has acceptable noise, vibration and harshness (NVH) characteristics, the powertrain controller comprising:
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a firing fraction calculator arranged to generate an operational effective firing fraction to deliver a requested engine torque; and a firing determination timing module that is arranged to generate a firing sequence used to operate the engine in a dynamic firing level modulation manner, the firing sequence being based on the operational effective firing fraction; wherein the powertrain controller is an adaptive controller that is arranged to determine a smoothing torque that is applied to a powertrain by an energy storage/capture/release device wherein the smoothing torque is arranged to at least partially cancel out a variation in torque generated by the firing sequence, thereby reducing NVH that would otherwise be generated by the firing sequence, wherein the dynamic firing level modulation manner has three torque levels associated with each firing opportunity, wherein the three torque levels are a high torque output, a low torque output level, and a skipped output level. - View Dependent Claims (35, 36, 37, 38)
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Specification