Solenoid valve control system for hydrostatic transmission

Details Solenoid valve control system for hydrostatic transmission Solenoid valve control system for hydrostatic transmission

1990-03-12

1991-05-21

Smith, Leonard E.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

417222, 91506, F04B 4906, F04B 126

Patent

active

050170945

ABSTRACT:
A control system (33, 41) is disclosed of the type used to control the displacement of a variable displacement pump (11) having stroking cylinders (25, 27). The control system includes a pair of ON-OFF electromagnetic valves (49, 51) and a proportional valve (85). When a first direction of operation is selected, a first direction command signal (43) is transmitted to the first ON-OFF valve (40) such that control pressure from the charge pump (17) flows through the valve (49), then through the proportional valve (85) and through the valve (51) to the reservoir (75) until the proportional valve (85), in response to an increasing displacement signal (47), moves from its minimum displacement position (FIG. 1) toward a position corresponding to the desired displacement of the pump. With the control system of the present invention, two of the three electromagnetic valves (49, 51, 85) would have to fail, such as being stuck in an open position, in order for the vehicle operator to be unable to bring the vehicle to a safe stop.

REFERENCES:
patent: 3529422 (1970-09-01), Herndon
patent: 3924410 (1975-12-01), Cornell
patent: 3935707 (1976-02-01), Murphy
patent: 4107924 (1978-08-01), Dezelan
patent: 4194361 (1980-03-01), Pahl
patent: 4244678 (1981-01-01), Uehara
patent: 4274257 (1981-06-01), Koch
patent: 4282711 (1981-08-01), Branstetter
patent: 4408453 (1983-10-01), Westveer
patent: 4810171 (1989-03-01), Krebs
patent: 4823552 (1989-04-01), Ezell

Affiliated with

Also associated with

Rating

Solenoid valve control system for hydrostatic transmission does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Solenoid valve control system for hydrostatic transmission, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solenoid valve control system for hydrostatic transmission will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-234577