Method of using a PTO clutch for auxiliary load measurement
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[0018] With reference now to the drawings, and more particularly to FIG. 1, it can be seen that a microprocessor-based transmission control system to which the present invention is applicable is designated generally by the numeral 10. A vehicle power train includes an engine 12 which is controlled by electronic engine control unit 14, and which drives a power shift transmission (PST) 16 via input shaft 13. Transmission 16 has an internal countershaft (not shown), and an output shaft 18 which is connected to drive wheels (not shown). The PST 16 includes a set of pressure operated control elements or clutches 20 which are controlled by a corresponding set of solenoid operated proportional control valves 22. The transmission 16 may be a transmission such as described in U.S. Pat. No. 5,011,465, issued Apr. 30, 1991 to Jeffries et al., and assigned to the assignee of this application. The valves 22 may be two-stage electro-hydraulic valves as described in U.S. Pat. No.4,741,364, issued May
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