| 摘要 |
PURPOSE:To set various control characteristic targets to optimization according to a degree of altitude by finding a ratio between an intake air operational flow rate being found by engine speed and throttle valve opening and an intake air mass flow rate being measured according to the altitude. CONSTITUTION:Car speed, throttle valve opening, engine speed and intake air mass flow by a hot-wire flowmeter 13 are all read in. A standard altitude intake air operational flow rate is retrieved with a preallocated 3-dimentional map, and a ratio gamma of the intake air operational flow to the intake air mass flow is operated. Referring to the map setting a shift position corresponding to the car speed and the throttle valve opening, such one made up of multiplying a constant to the ratio gamma is used as a corrected parameter, setting the shift position by means of retrieval. As the above mentioned, shift timing is shifted up latish by this corrected parameter at highland, thereby securing an optimum torque, thus noise and vibration can be prevented from occurring. |
