Automotive valve actuation method

Internal-combustion engines – Poppet valve operating mechanism – Electrical system

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Details

123490, 361154, 361190, F01L 118, H01H 4732

Patent

active

047066199

ABSTRACT:
A circuit and method for actuation of a gas intake or exhaust valve which is electromagnetically held in its opened and closed positions by an actuator assembly having a ferromagnetic element attractable by actuating solenoids. Control of the holding current flow through the solenoid coil is provided by a relaxation circuit element, and the excitation current is directly monitored and measured. Upon deexcitation of the coil and relaxation circuit-element activation, the decay current is not measured but is instead simulated. The relaxation circuit is supplied with pulsed current during the stationary phase of the valve, the current being measured in the pulse cycle during current supply, and is turned off upon exceeding a ceiling value. After the decay current has reached a threshold value, the current is turned on and permitted to rise momentarily. It is thereafter cycled off and on between an I.sub.1 and I.sub.2 value which is only about 10-20% of I.sub.max, the capture current.

REFERENCES:
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patent: 3700985 (1972-10-01), Applequist
patent: 4180026 (1979-12-01), Schulzke
patent: 4266261 (1981-05-01), Streit
patent: 4355619 (1982-10-01), Wilkinson
patent: 4360855 (1982-11-01), Ohba
patent: 4377144 (1983-03-01), Takahashi
patent: 4452210 (1984-06-01), Sasayama
patent: 4599674 (1986-07-01), Ishikawa

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