Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1994-11-23
1996-02-06
Hill, Mitchell J.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
B62D 600, B62D 1302
Patent
active
054890055
ABSTRACT:
In machines that are articulated in response to a steer input mechanism, it is many times necessary for the operator to make a steer input and then to make corrective adjustments in order to obtain the desired steer angle of the machine. In the subject invention, an electro-hydraulic steering system is provided which senses the desired steer input by the operator, senses the degree of articulation of the machine and a microprocessor delivers an electrical control signal (P) to an electro-hydraulic valve mechanism which effectively controls articulation of the machine. Once the machine has reached the degree of articulation desired by the operator, the microprocessor signals the electro-hydraulic valve mechanism to stop articulation of the machine. Consequently, the operator does not have to provide any adjustments thereto. Additionally, the ground speed of the machine is sensed and the rate of articulation is controlled in response thereto. In the subject arrangement, in the event of an electrical system failure, a back-up steering control circuit is automatically functional to control steering of the machine in a conventional manner. This arrangement provides an electro-hydraulic steering system that eases the operators fatigue by eliminating the need for corrective steer adjustments and is simple in construction and reliable in operation.
REFERENCES:
patent: 3439768 (1969-04-01), Medley
patent: 3943824 (1976-03-01), Fletcher
patent: 4811806 (1989-03-01), Lang
patent: 5174597 (1992-12-01), Uttenthaler
Marcott Tony L.
Nelson David E.
Rytter Noel J.
Burrows J. W.
Caterpillar Inc.
Hill Mitchell J.
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