| CPC F02N 11/0862 (2013.01) [B60K 6/26 (2013.01); B60K 6/387 (2013.01); B60W 10/06 (2013.01); B60W 10/26 (2013.01); B60W 20/15 (2016.01); B60W 20/40 (2013.01); H02J 7/14 (2013.01); B60W 2400/00 (2013.01); B60W 2540/10 (2013.01); B60W 2540/12 (2013.01); B60W 2710/06 (2013.01); B60Y 2200/92 (2013.01); B60Y 2300/91 (2013.01); B60Y 2400/61 (2013.01); F02N 2200/0809 (2013.01)] | 12 Claims |
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1. A method of controlling running of an engine, the method comprising:
receiving, by an input unit, required power data;
executing, by a controller, one among a first control for running the engine, a second control for keeping on running the engine, and a third control for stopping the engine, each of the first, and third controls being executed according to the required power data; and
discharging or charging a battery under control of the controller;
wherein, when a power demand is less than a reference value, the first control is executed by temporarily switching a charge depleting (CD) mode in which battery power of the battery is consumed to a charge sustaining (CS) mode in which the battery power is sustained;
wherein, when any one of an acceleration input, an engine off request, and a deceleration input is absent, the second control is executed by holding an engine-on state by delaying the engine off in preparation for re-acceleration in a state where there is not an acceleration input;
wherein the second control comprises any one of an engine charge mode control in which the engine-on state is held while the engine holds power of a certain amount or higher to charge the battery, an engine fuel-cut control in which the engine-on state is held in a state without fuel injection, an engine zero torque control in which the engine-on state is held by offsetting an engine load with engine outputting zero torque, and an exhaust gas recirculation (EGR) ratio-considered engine torque control in which the engine-on state is held by driving the engine by power through which an engine efficiency is highest in terms of an EGR ratio;
wherein in the second control, the engine-on state is held and the charging is performed, an engine clutch remains engaged, the engine is driven at a driving point selected to achieve a predetermined EGR ratio and to generate an engine torque for a constant amount, and the battery is charged by a driving motor; and
wherein the third control comprises selectively and sequentially performing:
a cumulative charge/discharge amount control, when there is no deceleration input, for accumulating a charge/discharge amount and turning the engine off when the cumulative charge/discharge amount is equal to or greater than a first preset reference amount;
a cumulative charge amount control, when a state of charge (SOC) of the battery is not charged to a certain level, for accumulating a charge amount and turning the engine off when the cumulative charge amount is equal to or greater than a second preset reference amount; and
an acceleration intention-considered cumulative charge amount control for accumulating an acceleration intention-considered charge amount while there is an acceleration input and turning the engine off when the acceleration intention-considered charge cumulative amount is a second preset reference or greater.
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