Temperature-compensated exhaust gas recirculation system

Details Temperature-compensated exhaust gas recirculation system Temperature-compensated exhaust gas recirculation system

1996-01-16

1997-05-13

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

25112915, 335217, 335219, F02M 2507, F16K 3102

Patent

active

056282966

ABSTRACT:
A solenoid exhaust gas recirculation (EGR) valve (12) includes a first inductive coil (48) that generates a magnetic field when energized by a signal from a control unit (13). The magnetic field drives a ferromagnetic armature valve (64) open and closed--metering the flow of recovered exhaust gases from an engine exhaust manifold (14) to an engine air intake manifold (16). The exhaust gas flow rate depends upon the amount of current flowing through the first coil (48). The resistance of the first coil (48) is temperature-dependent. Therefore, to reduce changes in coil current and magnetic field strength due to temperature changes, the first coil (48) is connected in series with a thermistor (75) having a temperature coefficient of resistance that is opposite that of the first coil (48). A temperature stable resistor in the form of a second coil (72) is connected across the thermistor (75) to modify the thermistor temperature-response curve to more closely offset that of the first coil (48). The second coil (72) may be disposed adjacent the first coil (48) to generate a magnetic field opposite that of the first coil (48). The opposing field reduces residual magnetism causing the valve (12) to respond to control inputs more positively.

REFERENCES:
patent: 3625476 (1971-12-01), Meier
patent: 4168756 (1979-09-01), Enzmann et al.
patent: 4240580 (1980-12-01), Fehr
patent: 4348710 (1982-09-01), Woods
patent: 4522371 (1985-06-01), Fox et al.
patent: 4556926 (1985-12-01), Yanagida
patent: 4805582 (1989-02-01), Braun et al.
patent: 4944276 (1990-07-01), House et al.
patent: 4961413 (1990-10-01), Grey et al.
patent: 4986246 (1991-01-01), Kessler de Vivie et al.
patent: 5094218 (1992-03-01), Everingham et al.
patent: 5237980 (1993-08-01), Gillier
patent: 5263439 (1993-11-01), Doherty et al.
patent: 5460146 (1995-10-01), Frankenberg
patent: 5494255 (1996-02-01), Pearson et al.
Standard NTC Thermistor Applications (Ketema, Rodan Division) (no date given).

Affiliated with

Also associated with

Rating

Temperature-compensated exhaust gas recirculation system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Temperature-compensated exhaust gas recirculation system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature-compensated exhaust gas recirculation system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1378748