Method of improving engine startability using hardware wake-up period control and vehicle using the same
First Claim
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-offtimer 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,wherein the performing the pump operation control mode includes detecting a low-pressure rail pressure and a high-pressure rail pressure formed by residual fuel in a fuel line for supplying fuel to the engine after the key-off, determining and outputting a target pressure of the residual fuel under the low-pressure rail pressure and the high-pressure rail pressure, detecting the high-pressure rail pressure formed by the residual fuel and determining whether the detected high-pressure rail pressure value satisfies a set pressure value, and operating the low-pressure fuel pump in response to the signal of the key-off output and stopping the operation of the low-pressure fuel pump by cut-off of the key-off output.
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Accused Products
Abstract
Disclosed herein is a vehicle having improved engine startability using hardware wake-up period control by performing a vehicle state detection mode to which a battery voltage, an engine oil temperature, and an engine coolant temperature are applied by a controller in a key-off state of an engine, a wake-up fuel pressure control mode for determining whether a soaking time reaches a wake-up set time by the count of a key-off timer for 80 minutes, a pump operation control mode for operating a low-pressure fuel pump for approximately 1 second by the current supplied in response to a key-off output signal over the period of 80 minutes, and a wake-up repetition control mode for repeating a number of times the low-pressure fuel pump is operated to maximum 6 times.
3 Citations
19 Claims
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1. A method of improving engine startability, comprising:
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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-offtimer 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, wherein the performing the pump operation control mode includes detecting a low-pressure rail pressure and a high-pressure rail pressure formed by residual fuel in a fuel line for supplying fuel to the engine after the key-off, determining and outputting a target pressure of the residual fuel under the low-pressure rail pressure and the high-pressure rail pressure, detecting the high-pressure rail pressure formed by the residual fuel and determining whether the detected high-pressure rail pressure value satisfies a set pressure value, and operating the low-pressure fuel pump in response to the signal of the key-off output and stopping the operation of the low-pressure fuel pump by cut-off of the key-off output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification