| 摘要 |
PROBLEM TO BE SOLVED: To switch a throttle in response to an intention of an operator, while securing safety by preventing a sudden change in an engine speed, when an indication effective throttle is switched to a sub-throttle from a main throttle, in a fuel injection system comprising the main throttle and the sub-throttle for indicating the engine speed of an engine. SOLUTION: When abnormality is caused in indicating the engine speed by the main throttle, a target engine speed Na calculated on the basis of an indicated value from the main throttle, is gradually reduced up to a preset minimum engine seed No. When the target engine speed reduces, when the target engine speed calculated on the basis of the indicated value from the sub-throttle is increased from the minimum preset engine speed No, the effective throttle is switched to the sub-throttle from the main throttle when the target engine speed calculated on the basis of the indicated value from the sub-throttle coincides with the reduced target engine speed (an intersection D). COPYRIGHT: (C)2006,JPO&NCIPI
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