Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1981-05-08
1984-09-04
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
74869, 74752A, 74870, 74878, F16H 548
Patent
active
044689870
ABSTRACT:
A master controller can be set by the driver in any of a range of forward drive positions D1 to D6 to pre-set upper and lower limits to the engine speed in any of a range of forward ratios such that any increase or reduction in vehicle speed which would cause the engine speed to exceed the upper limit or to fall below the lower limit of the setting chosen will result in an automatic shift to the next higher or to the next lower ratio respectively. Thus gear shifts occur at lower engine speeds in setting D1 than in setting D6. An additional setting B automatically brings about a shift to whatever ratio raises the engine speed nearest to the maximum safe limit to provide the maximum engine braking effect. Road speed is sensed by a sensor which yields its maximum output signal when the vehicle is stationary, the output signal decreasing progressively with increasing road speed so that in the event of failure of disconnection of the sensor, the control system causes the transmission to shift to the highest ratio in the range. The supply of oil under pressure to friction devices is controlled through relay valves. During an upshift, the pressure in the friction device associated with the outgoing brake is released at a controlled rate until the pressure in the incoming brake or clutch reaches a predetermined value whereupon the outgoing brake is then fully released. During a downshift, the outgoing brake or clutch is released immediately when the incoming brake starts to be applied.
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AB Volvo
Herrmann Allan D.
Rolnicki Joseph M.
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