Abstract: A method for detecting knocking of an engine includes receiving a knock signal indicating a vibration level in a cylinder of the engine and a crank angle signal indicating a crank angle by which a knocking window and an end of injection (EOI) of an injector of the engine are expressed, determining whether the knocking window and the EOI overlap, based on the crank angle signal, setting a second reference value for an overlapping range within the knocking window overlapping the EOI by reflecting a predetermined level on a first reference value for a non-overlapping range within the knocking window non-overlapping the EOI depending on the determination, integrating the knock signal in the knocking window, determining whether an integrated value of the knock signal exceeds the first reference value in the non-overlapping range or the second reference value in the overlapping range, and retarding an ignition timing of the engine as a knocking avoidance logic depending on the determination.

Abstract: A method of controlling vacuum pressure for vehicle braking may include checking whether a vehicle is idle or enters a deceleration state, comparing an engine vacuum pressure and a booster vacuum pressure of the vehicle with a preset reference value, checking whether a valve control system of the vehicle is operable when the engine vacuum pressure and the booster vacuum pressure are lower less than the preset reference value, controlling the valve control system when the valve control system is operable; and controlling an air conditioner (A/C) or an alternator of the vehicle when the valve control system is inoperable.

Abstract: A method of controlling vacuum pressure for vehicle braking may include checking whether a vehicle is idle or enters a deceleration state, comparing an engine vacuum pressure and a booster vacuum pressure of the vehicle with a preset reference value, checking whether a valve control system of the vehicle is operable when the engine vacuum pressure and the booster vacuum pressure are lower less than the preset reference value, controlling the valve control system when the valve control system is operable; and controlling an air conditioner (A/C) or an alternator of the vehicle when the valve control system is inoperable.