Valve opening and closing timing control apparatus

Details Valve opening and closing timing control apparatus Valve opening and closing timing control apparatus

1992-03-06

1992-12-15

Argenbright, Tony M.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9031, 123 9012, 464 2, F01L 134

Patent

active

051707551

ABSTRACT:
A valve opening and closing timing control apparatus is disclosed, which includes an engine including a cam shaft and a crank shaft, a first sensor adapted for detecting rotary positions of the cam shaft, a second sensor adapted for detecting rotary positions of the crank shaft, a first hydraulic pump and a second hydraulic pump driven by the crank shaft, a hydraulic pressure switching valve disposed between a discharge port of the first hydraulic pump and a discharge port of the second hydraulic pump and communicating therewith, a rotary phase varying device disposed on the cam shaft and adapted for varying rotary phases of the cam shaft, a hydraulic line connecting the hydraulic pump and the rotary phase varying device, a hydraulic control device disposed iin the hydraulic line, and an electronic control device adapted for controlling the hydraulic device and receiving output signals which are output by the first sensor and the second sensor at least, thereby operating the rotary phase varying device with the hydraulic control device under linear control. The valve opening and closing timing control apparatus can establish the valve opening and closing timing at optimum and desired occasions, which distinguishes over the conventional digitized valve opening and closing timing. Moreover, the engine driving losses can be suppressed because the hydraulic pressure switching valve bypasses the hydraulic pressures when the rotary phase varying device requires no hydraulic pressure.

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