JPS6246332U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a cross-sectional view of the throttle body, Figure 3 is a view taken in the direction of arrow A in Figure 2, Figure 4 is a line diagram showing changes in air flow rate with respect to changes in the rotation angle of the throttle drum, Figure 5 is a flowchart, and Figure 6 is a diagram. 7 is a sectional view showing another embodiment, FIG. 7 is a flowchart, FIG. 8 is a sectional view showing a conventional example of an intake air flow meter, and FIG. 9 is a diagram showing characteristics during transient operation in the conventional example. be. 2...Main intake passage, 3...Main throttle valve, 5...Sub-intake passage, 6...Sub-throttle valve, 10...Throttle drum, 14...Main throttle valve operation link, 15...Sub-throttle valve Operating cam, 23...Throttle opening sensor, 26
...control circuit.

Claims (1)

[Scope of utility model registration request] A main intake passage, a main throttle valve provided in the main intake passage and kept substantially fully closed in the low flow rate control range, a sub-intake passage that bypasses the main throttle valve, and a low-flow control valve provided in the sub-intake passage. A needle-type sub-throttle valve that controls the flow rate in a control region, a throttle valve opening detection means that detects the opening degrees of the main throttle valve and the sub-throttle valve, and an engine rotation speed detection means that detects the engine rotation speed. An intake air flow meter for an internal combustion engine, characterized in that the intake air flow rate is detected from the throttle valve opening degree and the engine rotational speed.