Fuel injection control system

摘要

A fuel injection control system includes an engine speed detector, a throttle opening degree detector, a fuel injection device, a fuel injection controller, a fuel injection number determining device, and a fuel injection mode setting device. The engine speed detector is configured to detect an engine speed (NE). The throttle opening degree detector is configured to detect a throttle opening degree (TH). The fuel injection device is configured to inject fuel. The fuel injection controller is configured to calculate, based on an injection amount map, a fuel injection amount of the fuel to be injected from the fuel injection device and is configured to control the fuel injection device to inject the fuel according to the calculated fuel injection amount.

主权项

1. A fuel injection control system comprising:
an engine speed detector configured to detect an engine speed (NE); a throttle opening degree detector configured to detect a throttle opening degree (TH); a fuel injection device configured to inject fuel; a fuel injection controller configured to calculate, based on an injection amount map, a fuel injection amount of the fuel to be injected from the fuel injection device and configured to control the fuel injection device to inject the fuel according to the calculated fuel injection amount; a fuel injection number determining device configured to determine based on the throttle opening degree (TH) detected by the throttle opening degree detector and the engine speed (NE) detected by the engine speed detector whether a frequency of fuel injections during one cycle of an engine is to be one or two, the one cycle of the engine having a predetermined number of divided injection stages including a first predetermined injection stage, a second predetermined injection stage after the first predetermined injection stage, and a third predetermined injection stage; and a fuel injection mode setting device,
in a case where the frequency of fuel injections determined by the fuel injection number determining device is switched from one to two, which is configured to set an injection mode to a two-time fuel injection transition mode in which an injection timing is gradually advanced every predetermined number of cycles while the frequency of fuel injections is kept at one and which is configured to set the injection mode from the two-time fuel injection transition mode to a two-time fuel injection mode, when the injection timing is shifted to the first predetermined injection stage, in which the frequency of fuel injections is set to two so that the first injection timing is kept in the first predetermined injection stage and an additional injection timing is set in the second predetermined injection stage after the first predetermined injection stage, andin a case where the frequency of fuel injections determined by the fuel injection number determining device is switched from two to one, the fuel injection mode setting device being configured to set the injection mode to a one-time fuel injection transition mode in which the frequency of fuel injections is set to one and the injection timing is gradually delayed from the first predetermined injection stage every predetermined number of cycles and the fuel injection mode setting device being configured to set the injection mode from the one-time fuel injection transition mode to a one-time fuel injection mode when the injection timing returns to the third predetermined injection stage; and the fuel injection controller being configured to control the fuel injection device according to the fuel injection mode set by the fuel injection mode setting device.