| 摘要 |
PURPOSE: A speed change returns quickly the change step of a vehicle to a neutral position by providing compressed air to both cylinder room of a transmission. CONSTITUTION: A method comprises following steps. At first, an electronic controlling device determines whether the change step of a vehicle is a neutral state or not by using a received change lever position signal(S110). If the position of the change lever is in a neutral position, a first magnetic valve chamber is controlled to be turned off during a predetermined specified time(S120). If the predetermined specified time is over, the first and a second magnetic valve chambers are controlled to be turned on. |
