Automatic range shift arrangement
First Claim
1. A range shift control system for a vehicular compound transmission (10) comprising a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14), said main transmission section having a selectable neutral position and said auxiliary transmission section having a high speed range ratio and a low speed range ratio, operator actuated selection means (107) allowing selection of a selected main transmission section ratio or a main transmission section neutral position and an auxiliary shifting mechanism (96) for shifting said auxiliary transmission section from one of said auxiliary section range speed ratios to another of said auxiliary section range speed ratios, said control system characterized by:
- means (100) for sensing a value indicative of vehicle ground speed and for providing a signal (100A) indicative thereof;
control means (102, 110, 111,
115) for controlling the operation of said auxiliary shifting mechanism, said control means including means for receiving said signal (100A) indicative of vehicle ground speed and comparing said signal to a predetermined reference value and, (i) if said signal exceeds said reference value automatically causing said shifting mechanism to urge a shift into said high speed range ratio, and, if said signal is less than said reference value, automatically causing said shifting mechanism to urge a shift into said low speed range ratio.
2 Assignments
0 Petitions
Accused Products
Abstract
An automatic range shift control system for automatically controlling range section (14) shifting in an otherwise manually shifted range type compound transmission (10) is provided. A sensor (100) senses a value indicative of vehicle ground speed and provides a signal (100A) which is compared to a reference value. If the signal is greater than the reference, an actuator (96) is urged to engage the high speed range ratio and if the signal is less than the reference, the actuator is urged to engage the low speed range ratio.
25 Citations
29 Claims
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1. A range shift control system for a vehicular compound transmission (10) comprising a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14), said main transmission section having a selectable neutral position and said auxiliary transmission section having a high speed range ratio and a low speed range ratio, operator actuated selection means (107) allowing selection of a selected main transmission section ratio or a main transmission section neutral position and an auxiliary shifting mechanism (96) for shifting said auxiliary transmission section from one of said auxiliary section range speed ratios to another of said auxiliary section range speed ratios, said control system characterized by:
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means (100) for sensing a value indicative of vehicle ground speed and for providing a signal (100A) indicative thereof; control means (102, 110, 111,
115) for controlling the operation of said auxiliary shifting mechanism, said control means including means for receiving said signal (100A) indicative of vehicle ground speed and comparing said signal to a predetermined reference value and, (i) if said signal exceeds said reference value automatically causing said shifting mechanism to urge a shift into said high speed range ratio, and, if said signal is less than said reference value, automatically causing said shifting mechanism to urge a shift into said low speed range ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A pressurized fluid operated range shift control system for a compound transmission (10) comprising a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14), said main transmission section having a selectable neutral position and said auxiliary transmission section shiftable to a selected one of a high speed and a low speed range section speed ratios, operator actuated selection means (107) allowing selection of a selected main transmission section ratio or said main transmission section neutral position, and an auxiliary shifting mechanism (96) comprising a fluid actuated actuator piston (114) slideably and sealingly received in an actuator cylinder (103) defining a first and second cylinder chamber, shifting from one of said auxiliary section range speed ratios to the other of said auxiliary section range speed ratios requiring pressurization of a selected one of said cylinder chambers, said control system characterized by:
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means (100) for sensing a value indicative of vehicle ground speed and for providing a signal (100A) indicative thereof; control valve means (102), independent of the neutral/not neutral condition of the main transmission section, to connect a selected one of said cylinder chambers to a source of pressurized fluid, said valve means having a first position for causing said actuator piston to urge engagement of said high speed range ratio and a second position for causing said actuator piston to urge engagement of said low speed range ratio; control means (110, 111, 112,
115) for controlling the operation of said control valve means (102), said control means including means for receiving said signal (100A) indicative of vehicle speed and comparing said signal to a predetermined reference value and, (i) if said signal exceeds said reference value automatically causing said valve means to assume said first position thereof, and (ii) if said signal is less than said reference value, automatically causing said valve means to assume said second position thereof. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for controlling range shifting for a vehicular compound transmission (10) comprising a multiple speed main transmission section (12) connected in series with a multiple speed auxiliary transmission section (14), said main transmission section having a selectable neutral position and said auxiliary transmission section having a high speed range ratio and a low speed range ratio, operator actuated selection means (107) allowing selection of a selected main transmission section ratio or a main transmission section neutral position and an auxiliary shifting mechanism (96) for shifting said auxiliary transmission section from one of said auxiliary section range speed ratios to another of said auxiliary section range speed ratios, said method characterized by:
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sensing (100) a value indicative of vehicle ground speed and providing a signal (100A) indicative thereof; receiving said signal (100A) indicative of vehicle ground speed and comparing said signal to a predetermined reference value and, (i) if said signal exceeds said reference value automatically causing said shifting mechanism to urge a shift into said high speed range ratio, and, if said signal is less than said reference value, automatically causing said shifting mechanism to urge a shift into said low speed range ratio. - View Dependent Claims (28, 29)
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Specification