Automated transmission system control with zero engine flywheel torque determination
AssigneeEaton Corporation
InventorsTHOMAS A. GENISE, RONALD K. MARKYVECH, JAMES R. MCREYNOLDS
Life of this patent
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Abstract
A control system/method for an at least partially automated transmission system (100) includes means to determine engine fueling required to cause a gross engine output torque (TEG (for zero flywheel torque)) resulting in zero flywheel torque (TFW=0). The engine (102) is caused to be fueled to the level required to cause zero flywheel torque at certain predetermined conditions, such as, for example, when disengaging a currently engaged ratio or during throttle recovery.
Claims34
A method for controlling an at least partially automated vehicular mechanical transmission system comprising a fuel-controlled engine, an engine controller for controlling fueling of the engine in accordance with command output signals, a multiple-speed mechanical transmission having an input shaft driven by the engine and an output shaft and a control unit for receiving input signals and processing same according to predetermined logic rules to issue command output signals, said method characterized by:
- determining a level of engine fueling required to cause substantially zero torque to the input shaft under current vehicle operating conditions;
- and
- controlling said system as a function of said level of engine fueling.
A vehicular semi-automated shift implementation system comprising:
- a manually shifted 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;
- means for determining a level of engine fueling required to cause substantially zero torque to the input shaft under current vehicle operating conditions;
- and
- means to sense conditions indicative of an operator intention to shift said transmission into neutral and effective, upon sensing conditions indicative of an operator intention to shift into neutral, to automatically cause said engine to be fueled to said level of engine fueling.
Dependencies are inferred from the claim text.