Vehicle front wheel assist drive overspeed control system

Patent · Tue Jan 13 00:00:00 EST 1987

OSTI ID:6986937

Riehl, D C

This patent describes a front wheel drive speed control system for a vehicle having a rear wheel drive and an assisting front wheel drive, comprising: (a) a hydraulic pump means operably connected by a hydraulic circuit to a hydraulic motor at each driven front wheel to cause rotation of that wheel; (b) an overrunning clutch assembly interposed between the motor and each associated wheel, engageable to facilitate rotation of the driven front wheel in both forward and reverse directions; (c) a speed sensing means has main rear wheel drive sensor mounted with a vehicle transmission output to the driven rear wheels thereof operable to provide pulse signals indicative of the speed of rotation of the driven rear wheels; (d) a driven front wheel sensor mounted with the vehicle and operable to provide pulse signals indicative of the speed of rotation of the driven front wheel; (e) a comparator means operable to compare the rate of rear wheel pulse signals with a first predetermined rate to produce a front wheel enabling signal when the rear wheel pulse signals are below the first predetermined rate; and (f) a front wheel drive operating circuit means connected to the comparator means to receive the front wheel enabling signal and operable to activate the hydraulic pump means to cause rotation of the front wheel.

• Assignee: Dresser Industries, Inc., Dallas, TX
• Patent Number(s): US 4635743
• OSTI ID: 6986937
• Resource Relation: Patent File Date: Filed date 12 Apr 1984
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
VEHICLES
COMPUTERIZED CONTROL SYSTEMS
MECHANICAL TRANSMISSIONS
SPEED REGULATORS
COMPARATOR CIRCUITS
HYDRAULIC EQUIPMENT
MOTORS
PULSES
PUMPS
ROTATION
SIGNALS
VELOCIMETERS
WHEELS
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
EQUIPMENT
MACHINE PARTS
MEASURING INSTRUMENTS
MOTION
330602* - Vehicle Design Factors- Engine-Transmission Matching