Patent ID: 7422501

Claim:
A throttle valve opening control device for a watercraft engine, in which at least one throttle valve opening of the engine is controlled by an operation of a remote controller, comprising: a remote controller operating position detecting means for detecting an operating position of the remote controller; and a control section for controlling a valve drive section that drives at least one throttle valve based upon a signal from the remote controller operating position detecting means, wherein the control section determines whether the operating position is in a trolling range or in a propelling range by the signal from the remote controller operating position detecting means, and when the control section determines that the operating position is in the trolling range, the control section configured to adjust the throttle valve opening by a change amount, relative to an operational amount of the remote controller, smaller than the change amount at a moment when the control section determines that the operating position is in the propelling range, the control section computing a target value of the throttle valve opening by multiplying a value of the operating position of the remote controller by a characteristic conversion coefficient, and when the operating position of the remote controller is in the trolling range, the value of the characteristic conversion coefficient is smaller than the value of the characteristic conversion coefficient at a moment when the operating position is in the propelling range.