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METHOD OF IMPROVING ENGINE STARTABILITY USING HARDWARE WAKE-UP PERIOD CONTROL AND VEHICLE USING THE SAME

  • US 20180163655A1
  • Filed: 10/03/2017
  • Published: 06/14/2018
  • Est. Priority Date: 12/12/2016
  • Status: Active Grant
First Claim
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1. A method of improving engine startability, comprising:

  • performing a vehicle state detection mode in which a battery voltage detection value, an engine oil temperature detection value, and an engine coolant temperature detection value are read by a controller in a key-off state of an engine, a soaking time is stored, and a count of a key-off timer is initiated;

    performing a wake-up fuel pressure control mode in which when each of the battery voltage detection value, the engine oil temperature detection value, and the engine coolant temperature detection value satisfies a set condition, whether the soaking time reaches a wake-up set time is determined by the count of the key-off timer;

    performing a pump operation control mode in which key-off output is sent in response to a signal of the key-off timer when the soaking time reaches the wake-up set time, and after a low-pressure fuel pump is operated by a current supplied thereto for a time at which the key-off output is maintained, the operation of the low-pressure fuel pump is configured to be stopped by cut-off of the key-off output; and

    performing a wake-up repetition control mode in which a number of times the low-pressure fuel pump is operated is counted as 1, and after the operation and stop of the low-pressure fuel pump are repeated until a number of times the low-pressure fuel pump is operated is counted as 6, the count of the key-off timer is stopped.

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