Method for starting a motor vehicle engine and engine control unit for controlling a motor vehicle engine
First Claim
1. A method for starting a motor vehicle engine, comprising:
- measuring a profile of a rotational speed of an engine shaft of the motor vehicle engine over a time period that includes multiple previous working cycles of a cylinder of the motor vehicle engine, wherein measuring the profile of the rotational speed of the engine shaft of the motor vehicle includes, for each of the multiple previous working cycles of the cylinder, determining a rotational speed increase of the engine shaft and a value of an ignition counter,determining, by extrapolating the profile of the rotational speed of the engine shaft of the motor vehicle for a future working cycle of the cylinder, an estimated rotational speed of the engine shaft that is expected to be present after the future working cycle of the cylinder takes place,comparing the estimated rotational speed with a resonant rotational speed range of a vibration damper, the vibration damper being configured as a dual-mass flywheel, wherein resonant vibrations occur in the vibration damper within the resonant rotational speed range, andif the estimated rotational speed is within the resonant rotational speed range, changing at least one of introduction parameters for a fluid to be introduced into the cylinder or an ignition time of the cylinder, by selecting a rotational speed lying outside the resonant rotational speed range which is close to the estimated rotational speed, calculating a cylinder power necessary to reach the selected rotational speed, and adjusting an opening or a closing timing of at least one electrically actuated valve so as to change the estimated rotational speed to be outside the resonant rotational speed range.
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Accused Products
Abstract
A method for starting a motor vehicle engine includes measuring the profile of a rotational speed of an engine shaft of the motor vehicle engine. An estimated rotation speed of the engine shaft is determined that is expected to be present after one working cycle of the next cylinder to be fired. The estimated rotational speed is compared with a resonant rotational speed range of a vibration damper. Where the vibration damper is configured as a dual-mass flywheel and resonant vibrations occur in the vibration damper within the resonant rotational speed range. If the estimated rotational speed is within the resonant rotational speed range, at least one of introduction parameters for the introduction of a fluid to be introduced into the cylinder or an ignition time of the cylinder is changed so as to change the estimated rotational speed to be outside the resonant rotational speed range.
12 Citations
14 Claims
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1. A method for starting a motor vehicle engine, comprising:
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measuring a profile of a rotational speed of an engine shaft of the motor vehicle engine over a time period that includes multiple previous working cycles of a cylinder of the motor vehicle engine, wherein measuring the profile of the rotational speed of the engine shaft of the motor vehicle includes, for each of the multiple previous working cycles of the cylinder, determining a rotational speed increase of the engine shaft and a value of an ignition counter, determining, by extrapolating the profile of the rotational speed of the engine shaft of the motor vehicle for a future working cycle of the cylinder, an estimated rotational speed of the engine shaft that is expected to be present after the future working cycle of the cylinder takes place, comparing the estimated rotational speed with a resonant rotational speed range of a vibration damper, the vibration damper being configured as a dual-mass flywheel, wherein resonant vibrations occur in the vibration damper within the resonant rotational speed range, and if the estimated rotational speed is within the resonant rotational speed range, changing at least one of introduction parameters for a fluid to be introduced into the cylinder or an ignition time of the cylinder, by selecting a rotational speed lying outside the resonant rotational speed range which is close to the estimated rotational speed, calculating a cylinder power necessary to reach the selected rotational speed, and adjusting an opening or a closing timing of at least one electrically actuated valve so as to change the estimated rotational speed to be outside the resonant rotational speed range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. An engine controller for controlling a motor vehicle engine, comprising:
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a sensor configured to measure a profile of a rotational speed of an engine shaft of the motor vehicle engine over a time period that includes multiple previous working cycles of a cylinder of the motor vehicle engine, wherein measuring the profile of the rotational speed of the engine shaft of the motor vehicle includes, for each of the multiple previous working cycles of the cylinder, determining a rotational speed increase of the engine shaft and a value of an ignition counter; a computer programmed to determine, by extrapolating the profile of the rotational speed of the engine shaft of the motor vehicle for a future working cycle of the cylinder, an estimated rotational speed of the engine shaft which is expected to be present after the future working cycle of the cylinder takes place; a comparator programmed to compare the estimated rotational speed with a resonant rotational speed range of a vibration damper configured as a dual-mass flywheel, wherein resonant vibrations in the vibration damper occur within the resonant rotational speed range; and a cylinder controller programmed to, if the estimated rotational speed is within the resonant rotational speed range, change at least one of introduction parameters for a fluid to be introduced into the cylinder or an ignition time of the cylinder, by selecting a rotational speed lying outside the resonant rotational speed range which is close to the estimated rotational speed, calculating a cylinder power necessary to reach the selected rotational speed, and adjusting an opening or a closing timing of at least one electrically actuated valve so as to change the estimated rotational speed to be outside the resonant rotational speed range.
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12. A motor vehicle engine for driving a motor vehicle, comprising:
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an engine shaft configured to output a torque; at least one cylinder configured to generate the torque by burning an introduced fluid; and an engine controller configured to influence at least one of introduction parameters for the introduced fluid or an ignition time for the at least one cylinder as a function of a rotational speed profile of the engine shaft, the engine controller including; a sensor configured to measure a profile of a rotational speed of the engine shaft of the motor vehicle engine over a time period that includes multiple previous working cycles of the at least one cylinder of the motor vehicle engine, wherein measuring the profile of the rotational speed of the engine shaft of the motor vehicle includes, for each of the multiple previous working cycles of the at least one cylinder, determining a rotational speed increase of the engine shaft and a value of an ignition counter; a computer programmed to determine, by extrapolating the profile of the rotational speed of the engine shaft of the motor vehicle for a future working cycle of the at least one cylinder, an estimated rotational speed of the engine shaft which is expected to be present after the future working cycle of the at least one cylinder takes place; a comparator programmed to compare the estimated rotational speed with a resonant rotational speed range of a vibration damper configured as a dual-mass flywheel, wherein resonant vibrations in the vibration damper occur within the resonant rotational speed range; and a cylinder controller programmed to, if the estimated rotational speed is within the resonant rotational speed range, change at least one of introduction parameters for the fluid to be introduced into the at least one cylinder or the ignition time of the at least one cylinder, by selecting a rotational speed lying outside the resonant rotational speed range which is close to the estimated rotational speed, calculating a cylinder power necessary to reach the selected rotational speed, and adjusting an opening or a closing timing of at least one electrically actuated valve so as to change the estimated rotational speed to be outside the resonant rotational speed range. - View Dependent Claims (13)
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Specification