Synchronizing control and method
AssigneeEaton Corporation
InventorsDouglas A. Hughes, Karen L. Marx
Life of this patent
Estimating the term…
Abstract
A control system/method for a controller-assisted, manually shifted transmission system (10). Upon sensing an intent to initiate a lever shift (ITS), the target gear ratio (GRT) is assumed to be a single shift from the currently engaged ratio (GRT=GRC±1) until a delay period of time (TDELAY) expires. After the delay period (T>TDELAY), the target ratio is determined as a function of shift lever position (SL) and/or fore/aft force (FF/FA) on the shift lever (48).
Claims60
A method for controlling a controller-assisted, manually shifted vehicular transmission system comprising a lever-shifted transmission having an input shaft drivingly connected to a fuel-controlled engine by a nonpositive coupling, a manually operated shift lever movable in a predetermined shift pattern, and a system controller for receiving inputs, including signals indicative of a position of said shift lever in said shift pattern, and processing same according to logic rules to issue command output signals to system actuators, including signals issued as a function of a determined target gear ratio (GRT), said method comprising the steps of:
- sensing initiation of a lever shift from a currently engaged gear ratio (GRC) followed by movement of the shift lever to a neutral position;
- for a period of time (TDELAY) after said initiation of a lever shift followed by movement of the shift lever to a neutral position, determining said target gear ratio as a function of said currently engaged gear ratio (GRT=GRC±1);
- and
- after expiration of said period of time (T>TDELAY), determining said target gear ratio as a function of said position of said shift lever in said shift pattern.
A control system for controlling dynamic shifting in a controller-assisted, manually shifted vehicular transmission system (10) comprising a multiple-ratio, non-synchronized transmission (12) having an output shaft (30) and an input shaft (28) connected to a fuel-controlled engine (18) by a non-positive coupling (20), a manually operated shift lever (44) movable in a shift pattern (12A) in a selection direction (X-X) and in an engageldisengage direction (Y-Y) to and from a centered neutral position (62) for disengaging and engaging selected ratios in the transmission, a position sensor (46) for continuously sensing the position of the shift lever in the shift pattern and providing an input signal (56) indicative thereof, and an electronic system controller (52) for receiving input signals (54) indicative of system operating conditions, including said signal from said position sensor, and processing same according to logic rules to issue command output signals (56) to system actuators, including signals issued as a function of a determined target gear ratio (GRT), said control system characterized by said logic rules including rules for:
- sensing a position of said shift lever in said shift pattern;
- sensing initiation of a lever shift from a currently engaged gear ratio (GRC) followed by movement of the shift lever to a neutral position;
- for a period of time (TDELAY) after said initiation of a lever shift followed by movement of the shift lever to a neutral position, determining said target gear ratio as a function of said currently engaged gear ratio (GRT=GRC±1);
- and
- after expiration of said period of time (T>TDELAY), determining said target gear ratio as a function of said position of said shift lever in said shift pattern.
Dependencies are inferred from the claim text.