Exhaust-gas recirculating system for internal-combustion engines

Details Exhaust-gas recirculating system for internal-combustion engines Exhaust-gas recirculating system for internal-combustion engines

1988-11-14

1990-03-13

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02M 2506, F02D 2108, F02D 118

Patent

active

049075608

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.

REFERENCES:
patent: 4143631 (1979-03-01), Stumpp
patent: 4286567 (1981-09-01), Ueda
patent: 4364369 (1982-12-01), Nomura et al.
patent: 4373496 (1983-02-01), Greiner et al.
patent: 4495929 (1985-01-01), Maeda et al.
patent: 4548184 (1985-10-01), Laufer et al.
patent: 4718385 (1988-01-01), Konrath

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