Vehicular semi-automatic shift implementation system for lever-shifted, splitter-type, compound transmission with an intent-to-shift switch operable to cause automatic control of engine fueling and initiation of a splitter shift
First Claim
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1. A vehicular semi-automated shift implementation system comprising:
- a manually shifted, compound transmission having a main section and a splitter section, said transmission having an input shaft driven by a fuel-controlled engine, an output shaft and a plurality of selectably engageable and disengageable jaw clutches allowing selection of a plurality of drive ratios and neutral, said jaw clutches selectively positioned by a manually operated shift lever having a plurality of selectable shift lever positions defining a shift pattern;
a manually operated intent-to-shift switch by which an operator can signal, independent of moving said shift lever, an intention to manually shift the transmission;
means to sense operation of said intent-to-shift switch and effective, upon sensing operation of said intent-to-shift switch, (1) to automatically cause said engine to be fueled to minimize torque transfer between said input shaft and said output shaft, and (2) to automatically initiate a splitter shift.
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Abstract
A semi-automatic shift implementation system (100) for a lever-shifted mechanical transmission (10) includes an intent-to-shift sensor (122), such as an intent-to-shift button (120). Upon sensing an intent to shift, a controller (146) will cause the engine to be fueled to minimize torque-lock conditions at jaw clutches to be disengaged.
53 Citations
10 Claims
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1. A vehicular semi-automated shift implementation system comprising:
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a manually shifted, compound transmission having a main section and a splitter section, said transmission having an input shaft driven by a fuel-controlled engine, an output shaft and a plurality of selectably engageable and disengageable jaw clutches allowing selection of a plurality of drive ratios and neutral, said jaw clutches selectively positioned by a manually operated shift lever having a plurality of selectable shift lever positions defining a shift pattern; a manually operated intent-to-shift switch by which an operator can signal, independent of moving said shift lever, an intention to manually shift the transmission; means to sense operation of said intent-to-shift switch and effective, upon sensing operation of said intent-to-shift switch, (1) to automatically cause said engine to be fueled to minimize torque transfer between said input shaft and said output shaft, and (2) to automatically initiate a splitter shift. - View Dependent Claims (2, 3)
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4. A vehicular semi-automated shift implementation system comprising:
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a manually shifted, compound transmission having a main section and a splitter section, said transmission having an input shaft driven by a fuel-controlled engine, an output shaft and a plurality of selectably engageable and disengageable main section jaw clutches allowing selection of a plurality of drive ratios and neutral, said jaw clutches selectively positioned by a manually operated shift lever having a plurality of selectable shift lever positions defining a shift pattern; a splitter section operator for non-manually shifting said splitter section; an engine controller effective to fuel said engine in accordance with command output signals; an operator-actuated intent-to-shift switch for providing an intent-to-shift signal indicative of operator intent to shift into neutral; and a controller for receiving input signals including said intent-to-shift signals and for processing same according to predetermined logic rules to issue command output signals to system actuators including said engine controller and said splitter section operator; said logic rules including rules for (1) causing said engine to be fueled to minimize torque transfer between said input and output shafts and (2) automatically selecting a splitter shift upon sensing operator actuation of said intent-to-shift switch. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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Specification