VCT system having robust closed loop control employing dual loop

Details VCT system having robust closed loop control employing dual loop VCT system having robust closed loop control employing dual loop

1992-03-05

1993-02-09

Nelli, Raymond A.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, 123 9011, F01L 134

Patent

active

051845784

ABSTRACT:
A camshaft (26) has a vane (60) secured to an end thereof for non-oscillag rotation therewith. The camshaft also carries a sprocket (32) which can rotate with the camshaft but which is oscillatable with the camshaft. The vane has opposed lobes (60a, 60b) which are received in opposed recesses (32a, 32b), respectively, of the sprocket. The recesses have greater circumferential extent than the lobes to permit the vane and sprocket to oscillate with respect to one another, and thereby permit the camshaft to change in phase relative to a crankshaft whose phase relative to the sprocket is fixed by virtue of a chain drive extending therebetween. The camshaft tends to change in reaction to pulses which it experiences during its normal operation, and it is permitted to change only in a given direction, either to advance or retard, by selectively blocking or permitting the flow of hydraulic fluid, preferably engine oil, through the return lines (94, 96) from the recesses by controlling the position of a spool (100) within a valve body (98) of a control valve in response to a signal indicative of an engine operating condition determined from a closed loop feedback system.

REFERENCES:
patent: 4313165 (1982-01-01), Clelford et al.
patent: 4675804 (1987-06-01), Wiemer
patent: 4771742 (1988-09-01), Nelson et al.
patent: 4787345 (1988-11-01), Thoma
patent: 4802376 (1989-02-01), Stidworthy
patent: 4813339 (1989-03-01), Uno et al.
patent: 4841924 (1989-06-01), Hampton et al.
patent: 4854273 (1989-08-01), Uesugi et al.
patent: 4856465 (1989-08-01), Denz et al.
patent: 4858572 (1989-08-01), Shirai et al.
patent: 4862845 (1989-09-01), Butterfield et al.
patent: 4872426 (1989-10-01), Sapienza, IV
patent: 4878461 (1989-11-01), Sapienza, IV et al.
patent: 4890589 (1990-01-01), Miyate
patent: 4907493 (1990-03-01), Bellanger et al.
patent: 4909194 (1990-03-01), Bauer
patent: 4914365 (1990-04-01), Murakami et al.
patent: 4928640 (1990-05-01), van Vuuren et al.
patent: 4942854 (1990-06-01), Shirai et al.
patent: 4967701 (1990-11-01), Isogai et al.
patent: 4976229 (1990-12-01), Charles
patent: 4993370 (1991-02-01), Hashiyama et al.
patent: 4995351 (1991-02-01), Ohkubo et al.
patent: 4996954 (1991-03-01), Seki et al.
patent: 5002023 (1991-03-01), Butterfield et al.
patent: 5003937 (1991-04-01), Matsumoto et al.
patent: 5009203 (1991-04-01), Seki
patent: 5012773 (1991-05-01), Akasaka et al.
patent: 5020487 (1991-06-01), Kruger
patent: 5022357 (1991-06-01), Kawamura
patent: 5023535 (1991-06-01), Miller et al.
patent: 5027753 (1991-07-01), Hamazaki et al.
patent: 5031583 (1991-07-01), Konno
patent: 5040499 (1991-08-01), Akasaka et al.
patent: 5046460 (1991-09-01), Butterfield et al.
patent: 5063895 (1991-11-01), Maunpferer
patent: 5067450 (1991-11-01), Kane et al.
patent: 5078647 (1992-01-01), Hampton
patent: 5080052 (1992-01-01), Hoffa et al.
patent: 5090365 (1992-02-01), Hoffa et al.
patent: 5113814 (1992-05-01), Suga et al.
patent: 5117785 (1992-06-01), Suga et al.
patent: 5121717 (1992-06-01), Simko et al.
patent: 5138985 (1992-08-01), Szodfridi et al.

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