Patent ID: 6105449
Filing Date: 2000-08-22
Classification: B60W,F16H,Y10T

Abstract:
A compound vehicular transmission system (10) comprising:a compound splitter-type mechanical transmission (16) having an input shaft coupled (26) to a fuel-controlled engine (12) and an output shaft (20), said transmission having a shift-lever-shifted, synchronized main transmission section (16A) connected in series with a splitter-type auxiliary section (16B), said splitter-type auxiliary transmission section (16B) interposed between said main transmission section (16A) and said engine;a fuel controller (36) for controlling fueling of the engine;a device (52) for sensing an operator intent to shift and providing a signal indicative thereof;a splitter actuator (46) for selectively causing said splitter section to be shifted into a selected one of a first splitter ratio (low), a second splitter ratio (high), or a splitter-neutral (N) position, anda controller (48, 36) for receiving input signals (68) and processing same according to logic rules to issue command output signals (70) to system actuators including said fuel controller and said splitter section actuator, said logic rules including rules for determining an engaged or neutral position of said main transmission section and of said auxiliary transmission section, and effective(a) to determine a target ratio;(b) upon sensing an intent to shift, to command (i) said engine to be fueled to minimize torque between said input and output shafts and (ii) said auxiliary section to be shifted to neutral;(c) upon sensing that either said main or said auxiliary section is in neutral, to cease commanding said engine to be fueled to minimize torque between said input and output shafts;(d) then, upon sensing said main transmission section in a neutral position, commanding said engine to be fueled to achieve a substantially synchronous speed for engaging said target ratio; and(e) after sensing engagement of said main transmission section, causing engagement of said auxiliary section.