Variable cam engine

Details Variable cam engine Variable cam engine

1991-09-30

1992-11-03

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134

Patent

active

051599058

ABSTRACT:
A variable cam engine comprises a low speed power cam arranged so as to generate high power at low engine speeds, a high speed power cam arranged so as to generate high power at high engine speeds, and an economy cam arranged so as to give good fuel cost performance. The engine is provided with a device for detecting the running condition of the engine, a device for identifying a target cam from among the cams depending on the running condition of the engine, a device for identifying a present cam, a device for selecting either the target cam or another cam depending on whichever gives the smaller torque step with respect to the present cam, and a device for transmitting the motion of the cam selected to a valve. In the above construction, when there is a large torque step between the present cam and the target cam, cams can be changed over via a cam intermediate between the two. The torque step when the cams are changed over is therefore reduced, and the change-over to the target cam proceeds smoothly.

REFERENCES:
patent: 4887561 (1989-12-01), Kishi
patent: 4887563 (1989-12-01), Ishida et al.
patent: 4926804 (1990-05-01), Fukuo

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