Multidependent valve timing overlap control for the cylinders of

Details Multidependent valve timing overlap control for the cylinders of Multidependent valve timing overlap control for the cylinders of

1983-11-29

1989-08-15

Lazarus, Ira S.

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134

Patent

active

048564656

ABSTRACT:
The oil pressure applied to a hydraulic device for controlling within a limited angular range of a cam shaft and its drive gear is controlled by a magnetic valve (35) which is switched between its open and closed position under control of the same microcomputer which controls engine ignition and/or fuel injection with reference to a predetermined function of some of the same engine operation parameters, namely engine speed and engine load, which are used to control ignition and/or fuel injection. The control function can advantageously also take account of rate of change of engine load or engine speed. A transducer (43) for reporting back the sleeve (22) which controls the mechanical rotary shift in response to oil pressure can be used to provide an actual value signal to the computer for generation of an error signal for controlling the magnetic valve so as to provide a continuous control of the overlap of the open periods of the intake and exhaust valves of the engine. The control function for the operation of the magnetic valve provides for hysteresis to prevent excessive switching back and forth.

REFERENCES:
patent: 3741176 (1973-06-01), Schmidt et al.
patent: 3978829 (1976-09-01), Takahashi et al.
patent: 4091776 (1978-05-01), Clemens et al.
patent: 4231330 (1980-11-01), Garcea
patent: 4354460 (1982-10-01), Mae et al.
patent: 4408580 (1983-10-01), Kosuda et al.
patent: 4452188 (1984-06-01), Kosuda et al.

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