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.

Abstract: An automobile engine misfire detecting method adapted to use a wide—range oxygen sensor mounted at a gas exhausting system wherein an abrupt man—made concentration change of oxygen is generated prior to entry of conventional misfire detection judging logic and response characteristic of wide—range oxygen sensor is measured therefrom, on which standard value of misfire detection judgment and standard phase angle range for distinguishing misfired cylinder are corrected to perform the misfire detection and misfired cylinder discrimination, thereby enabling to minimize the influence caused by aged wide—range oxygen sensor and characteristics of each sensor and to effect a more accurate detecting operation.

Abstract: An automobile engine misfire detecting method adapted to use a wide-range oxygen sensor mounted at a gas exhausting system wherein an abrupt man-made concentration change of oxygen is generated prior to entry of conventional misfire detection judging logic and response characteristic of wide-range oxygen sensor is measured therefrom, on which standard value of misfire detection judgment and standard phase angle range for distinguishing misfired cylinder are corrected to perform the misfire detection and misfired cylinder discrimination, thereby enabling to minimize the influence caused by aged wide-range oxygen sensor and characteristics of each sensor and to effect a more accurate detecting operation.