Exhaust-gas recirculating system for internal-combustion engines
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United States of America Patent
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Mar 13, 1990
Grant Date -
N/A
app pub date -
Nov 14, 1988
filing date -
Dec 3, 1987
priority date (Note) -
Expired
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Abstract
An exhaust-gas recirculating system for internal-combustion engines includes a fuel-injection system which generates a hydraulic back pressure during control of the load- and speed-dependent variation of the beginning of delivery within a given set of load and speed characteristics. An hydraulic back pressure is used directly to control a pneumatic directional valve by means of an hydraulic servomotor. This directional valve, in turn, controls a vacuum-operated exhaust-gas recirculation valve. The hydraulic back pressure is also controlled by means of a pressure-holding valve and a constricting throttle.
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