Method and device for adjusting the angular position of a camsha

Details Method and device for adjusting the angular position of a camsha Method and device for adjusting the angular position of a camsha

1994-06-16

1995-05-23

Yuen, Henry C.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, 464 1, 464160, F02D 1302, F01L 134

Patent

active

054171873

ABSTRACT:
A method to adjust the angular position of a camshaft, which is related to the arc of a crankshaft rotation, to a setpoint angular position with the help of a final controlling element that is triggered by an actuating signal from a controlling device that becomes operational when a control program is run. The final controlling element is able to be triggered in each case by one of three values of the actuating signal; the re-adjustment rate (v.sub.-- ESTIMATED) of the camshaft is estimated for its level at the beginning of the subsequent program run; from this re-adjustment rate and the known time response (c, v.sub.-- END) of the camshaft re-adjustment, after the switch is made to the actuating signal from the hold value, a special adjustment angle (.alpha..sub.-- ESTIMATED+) is estimated; and the change is already made from the early or late value of the actuating signal to its hold value when the deviation between the adjustment angle (.alpha..sub.-- ESTIMATED+) and the setpoint angular position lies within a tolerance band. The angular position of the camshaft is thereby able to be adjusted in a rapid and stable manner.

REFERENCES:
patent: 4928640 (1990-05-01), van Vuuren et al.
patent: 5181484 (1993-01-01), Kan et al.
patent: 5184578 (1993-02-01), Quinn, Jr. et al.
patent: 5289805 (1994-03-01), Quinn, Jr. et al.
patent: 5333577 (1994-08-01), Shinojima
patent: 5363817 (1994-11-01), Ikeda et al.

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