Electronic feedback EGR valve

Details Electronic feedback EGR valve Electronic feedback EGR valve

1983-12-20

1986-01-28

Feinberg, Craig R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

137907, 251 615, F02M 2506

Patent

active

045664234

ABSTRACT:
A vacuum operated EGR valve/controller having a vacuum signal responsive diaphragm converted to operate the EGR poppet valve. A flow limiting orifice is provided upstream of the valve and a flow sensing pressure tap provided intermediate the valve and the orifice. Flow pressure is sensed by a piezoresistive transducer which gives an electrical signal indicative thereof. In one embodiment, the transducer is stationary and flow sensing tube is extended to the valve body. In a second embodiment, the transducer is mounted on the diaphragm for movement therewith and flow sensing is internal through the valve actuator. In another embodiment, a flow sensing orifice is provided downstream of the valve and the transducers has a reference and dynamic probe for sensing the differential of flow pressure on opposite sides of the sensing orifice. In another embodiment, plates attached to the diaphragm form a flow pressure sensing chamber and the transducer tube is received through the plate rail and is sealed by a flexible seal.

REFERENCES:
patent: 895426 (1908-08-01), Cable
patent: 4142495 (1979-03-01), Lahiff
patent: 4290404 (1981-09-01), Hata et al.
patent: 4318385 (1982-03-01), Yamaguchi
patent: 4399798 (1983-08-01), Stoltman

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