Engine start method of vehicle having starter motor and ISG
First Claim
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1. An engine start method of vehicle having a starter motor and an ISG, comprising:
- receiving an engine coolant temperature and voltage values of a high-voltage battery and a low-voltage battery;
determining an objective start speed rpm1 of the starter and an objective start speed rpm1 of the ISG based on the engine coolant temperature;
deciding whether to use the starter or the ISG based on the voltage values of the batteries, and determining an objective start speed rpm2 based on the voltage value of at least one of the batteries;
determining a final objective start speed based on the objective start speeds of the starter and/or the ISG; and
driving the starter and/or the ISG, and, if an engine speed reaches the final objective start speed, then executing a fuel injection and a firing.
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Abstract
An engine start method of a vehicle having starter and ISG considers the temperature of an engine coolant and the voltage of a battery. The objective start rpm of the starter is raised and the objective start rpm of the ISG is lowered as the engine temperature is lowered.
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Citations
9 Claims
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1. An engine start method of vehicle having a starter motor and an ISG, comprising:
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receiving an engine coolant temperature and voltage values of a high-voltage battery and a low-voltage battery; determining an objective start speed rpm1 of the starter and an objective start speed rpm1 of the ISG based on the engine coolant temperature; deciding whether to use the starter or the ISG based on the voltage values of the batteries, and determining an objective start speed rpm2 based on the voltage value of at least one of the batteries; determining a final objective start speed based on the objective start speeds of the starter and/or the ISG; and driving the starter and/or the ISG, and, if an engine speed reaches the final objective start speed, then executing a fuel injection and a firing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification