Variable valve timing operated engine

Details Variable valve timing operated engine Variable valve timing operated engine

1992-03-11

1992-11-10

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

F01L 134

Patent

active

051614979

ABSTRACT:
A method of operating an automotive-type engine by independently phase shifting the intake and exhaust valves to provide at part loads late closing of the intake valve during the compression stroke to reduce pumping losses, with a delayed overlap between the opening of the intake valve and closing of the exhaust valve controlled to reduce HC and control NO.sub.x by providing a desired level internal EGR by the backflow of gases into the cylinder and intake port, and late opening of the exhaust valve during the expansion stroke to increase expansion work; also a low overlap at idle for improved stability, and optimizing valve timings at wide open throttle for increased torque and power output.

REFERENCES:
patent: 4305352 (1981-12-01), Oshima et al.
patent: 4327676 (1982-05-01), McIntire et al.
patent: 4534323 (1985-08-01), Kato et al.
patent: 4582029 (1986-04-01), Masuda et al.
patent: 4685429 (1987-08-01), Oyaizu
patent: 4700684 (1987-10-01), Pischinger et al.
patent: 4703734 (1987-11-01), Aoyama et al.
patent: 4722315 (1988-02-01), Pickel
patent: 5020487 (1991-06-01), Kruger
SAE Paper No. 800794, Jun. 1980, Tuttle.

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