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Method for starting a motor vehicle engine and engine control unit for controlling a motor vehicle engine

  • US 10,082,096 B2
  • Filed: 01/20/2016
  • Issued: 09/25/2018
  • Est. Priority Date: 01/23/2015
  • Status: Active Grant
First Claim
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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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