Patent ID: 6119653
Filing Date: 2000-09-19
Classification: F02B,F02D,Y02T

Abstract:
An engine running control apparatus for an outboard motor comprising: an engine as a rotational driving source of a propeller shaft; a throttle valve disposed in an air intake passage connected to the engine; an air supplying channel disposed upstream of the throttle valve for supplying air to the air intake passage; and an air control valve for controlling air from the air supplying channel, wherein the engine speed is controlled by controlling air supplied from the air supplying channel by means of the air control valve, the engine running control apparatus comprising:a full-closure state detecting means for outputting a full-closure detection signal when the throttle valve is in the fully closed state;a control means for control the open degree of the air control valve;a time-measuring means for counting up a predetermined period of time in response to the full-closure detection signal;an engine speed detecting means for detecting the rotating speed of the engine; andan initial value setting means for setting up an engine speed at which control of the degree of the opening is started by the control means, in response to the full-closure detection signal, characterized in that the control means, in response to the reception of the full-closure detecting signal, fixes the degree of the opening of the air control valve until the time-measuring means counts up to a predetermined period of time, and controls the opening of the air control valve after the elapse of the predetermined time so that the engine speed will be reduced at a predetermined rate over time.