Patent Document ID: 9067662
Application ID: 14149920
Patent Flag: 1

Claim One:
1. An atmospheric pressure estimation device of an outboard motor unequipped with a battery and configured to start an engine by manually rotating a crankshaft, comprising: an electronic control unit that controls the engine; an operation state detection portion that detects an operation state of the engine; an intake pressure detection portion that detects an intake pressure of the engine; and a throttle opening detection portion that detects opening of an intake metering valve of the engine, wherein the electronic control unit performs: processing to match a throttle full-open value at every engine rotation speed calculated from a rotation speed of the engine using the intake pressure and set the matched value in a throttle full-open map; processing to determine an atmospheric pressure learning region on the basis of the throttle full-open value found from the throttle full-open map and a value of actual throttle opening; processing to match an estimated atmospheric pressure using an average intake pressure calculated by the intake pressure detection portion and set the matched value in an estimated atmospheric pressure map; and processing to obtain an atmospheric pressure learning value by applying filtering to the estimated atmospheric pressure found from the estimated atmospheric pressure map in the atmospheric pressure learning region and update the atmospheric pressure learning value at predetermined intervals.