JPH0317141U - - Google Patents

Description

[Brief explanation of the drawing]

1 and 2 show a rotary valve device with a fail-safe mechanism as a first embodiment of the present invention, FIG. 1a is a schematic diagram showing its configuration, FIG. 1b is a schematic plan view thereof, FIG. 2 is a graph illustrating a method for determining abnormality in a rotary valve, FIG. 3 is a schematic configuration diagram showing a rotary valve device with a fail-safe mechanism as a second embodiment of the present invention, and FIG. Figures 6 to 6 show conventional examples of rotary valves for intake control, Figure 4 is a sectional view thereof, and Figures 5 and 6 are a plan view sectional view and a side sectional view of an automobile engine equipped with the rotary valve. , FIG. 7 is a block diagram showing another conventional example of a rotary valve device, and FIGS. 8 to 11 are diagrams showing problems with the conventional rotary valve device. DESCRIPTION OF SYMBOLS 1...Four cylinder engine, 1a...Cylinder head portion, 1A...Combustion chamber, 2a-2d...Cylinder, 3...Intake manifold, 4...Rotary valve, 4a...Valve body, 5a, 5b...
Intake valve, 8, 8a to 8d... Intake flow hole, 10...
...Crankshaft, 9, 9a-9d...Intake manifold passage section, 51, 51a-51
d...Bypass passage, 52...Bypass opening/closing valve, 53...Valve drive mechanism, 54...Pneumatic cylinder, 54a...Cylinder interior, 54b...Return spring, 55...Negative pressure tank, 56...
...Air flow path, 57...Solenoid valve, 58...
...Controller unit (CU) as a control device
), 59a...engine rotation speed sensor, 59b...
...Throttle opening sensor, 59c...Intake air amount sensor, NE...Engine speed, θTH...Throttle opening, QA...Intake air amount.

Claims (1)

[Scope of utility model registration request] In a rotary valve that is rotationally driven at a speed corresponding to an intake valve installed in an intake passage of an engine and controls the timing of intake air into a combustion chamber, the intake passage includes a bypass passage provided in parallel with the rotary valve, and a bypass passage provided in the intake passage in parallel with the rotary valve. a bypass opening/closing valve provided in the passage and normally kept closed;
a valve driving mechanism capable of driving the bypass opening/closing valve; an abnormality detection means for detecting an abnormality in the rotary valve; and a valve driving mechanism configured to open the bypass opening/closing valve upon receiving an abnormality detection signal from the abnormality detection means. A rotary valve device with a fail-safe mechanism, characterized in that it is equipped with a control device that controls the operation of the mechanism.