| 摘要 |
PROBLEM TO BE SOLVED: To optimize an air-fuel ratio in a transition operation by calculating an injection signal for an injection amount best for LPG based on a gasoline injection valve drive signal, in an LPG injection system using a gasoline injection system. SOLUTION: The LPG injection system comprises: an electronic control unit 15 for LPG, receiving the gasoline injection valve drive signal output from an electronic control unit 20 for gasoline to calculate an LPG injection amount; and an LPG injection valve 7. For supplying the LPG to the engine by the LPG injection system, the electronic control unit 15 has a predetermined calculation filtering function, and in the previous step of calculating the LPG injection valve drive signal based on the received gasoline injection valve drive signal, an excessive part of the gasoline injection valve drive signal caused by difference in vaporization property between the gasoline and LPG is cut to acquire an appropriate air-fuel ratio. COPYRIGHT: (C)2005,JPO&NCIPI
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