Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-04-25
1979-04-10
Scott, Samuel
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4106
Patent
active
041482310
ABSTRACT:
An electronic digital control system is disclosed for vehicle power transmissions, especially adapted for off-highway earth moving vehicles. Automatic forward speed range shifting is provided in response to the vehicle speed subject to certain overriding manual control. A transmission output speed signal is applied to a shift signal generating means which has a plurality of channels each corresponding to a different forward speed range. A level detecting means in each channel produces digital upshift and downshift signals and shift signal counting means, connected with all channels, produces a net count of upshift and downshift signal events and a command signal representing the speed range into which the transmission is to be shifted. A shift control circuit responds to the command signal to effect the required ratio change in the transmission. Feedback means are provided from the counting means to the shift signal generating means to ensure that a shift signal event will not be produced for any speed range except those immediately higher or lower than the existing speed range. A manual range selector switch inhibits the automatic system from shifting to a speed range higher than that selected by the operator. The system includes means for causing lock-up of the torque converter in a predetermined speed range and for momentary unlock of the converter during shifting of the transmission. Manual control functions including reverse drive, neutral and low-low drive are provided in the control system.
REFERENCES:
patent: 3961546 (1976-06-01), Gilmore et al.
Clark Equipment Company
McKenzie, Jr. Frank H.
Scott Samuel
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