摘要:
An automatic clutch control system for controlling a vehicle master clutch drivingly interposed a throttle controlled engine and a change gear transmission having a clutch protection portion (70) to prevent the clutch from destructively overheating due to excessive slipping is provided. The clutch protection portion (70) includes a device for maintaining a variable parameter simulating clutch operating temperature (110) and devices (104 and 116) for causing said variable parameter to be increased and decreased, respectively, at first and second rates selected to simulate clutch heating and cooling rates, respectively. A signal generating device (126) is responsive to the simulated value exceeding a predetermined limit to generate a clutch protection output signal (84) effective to cause the clutch to be operated in a non-slipping, preferably fully engaged, mode of operation. The devices (104 and 116) for causing the numerical value to be increased or decreased are actuated in response to sensed and/or calculated inputs (72, 74, 76, 78 and 82). The device (126) for generating the clutch protection signal may be reset to a non-signal generating condition in response to selected sensed and/or calculated imputs thereto.
摘要:
Disclosed is an automatic control system for a powershift, preselect transmission (10) including a plurality of power paths (36, 38) alternately connectable between input (12) and output (20) shafts by first engaging selected ones of synchronizer clutches (42, 74, 84) associated with each of a plurality speed ratio gears (44,46,76,78,80) in each path and then alternately engaging a powershift clutch (48, 82) associated with each path. The control system includes a hydraulic logic system (118) which may be electronic and a hydraulic and shift valve system which may be electrically controlled should the logic be electronic. The control system preselects ratio gears in a nondriving path and then alternately engages the powershift clutches to switch driving connections from one path to the other. The logic system includes an improved reverse sequence valve (132) and improved shift valves (124, 126, 128). The shift valve system includes the feature of trimmer valves (364, 370, 372, 374) to control the engagement rate of the synchronizer clutches and combination trimmer valves (360, 366) to control the engagement rate of the powershift clutches. The logic system further includes the feature of a reverse sequence valve (132') for preselecting reverse as a function of speed and independent of the shift selector position.
摘要:
A truck tractor and trailer electrical communication system having one electronic control unit (8) located in tractor and another electronic control unit located in at least one trailer both respectively controlling the state of a plurality of switching devices (10A,10B,12A,12B,13A,13B,16) to establish the appropriate electrical connection into and out of a standard seven pin tractor/trailer electrical connector (22,24) where high speed data communication links are used for control and diagnostics.
摘要:
57 An improved control system for an automatic change gear transmission (10) driven by a throttle (18) controlled engine (12) is provided. The control system includes a processing unit (30) for receiving inputs indicating at least throttle position (18), engine speed (20) and vehicle speed (28) and for processing these inputs in accordance with a program to determine the correct engaged gear ratio and for issuing command signals to a transmission shifting mechanism (26). The processing unit includes of operator actuated selection means (32) for selecting a mode of operation (D, or D L ) wherein vehicle performance is maximized and the control will evaluate and execute allowable skip downshifts.
摘要:
A truck tractor and trailer electrical communication system having one electronic control unit (8) located in tractor and another electronic control unit (40) located in at least one trailer both respectively controlling the state of a plurality of switching devices (10A,10B,12A,12B,13A,13B,14,44,56,66) to establish the appropriate electrical connection into and out of a standard seven pin tractor/trailer electrical connector (22,24) where high speed data communication links are used for control and diagnostics.
摘要:
Disclosed is an automatic control system for a powershift, preselect transmission (10) including a plurality of power paths (36, 38) alternately connectable between input (12) and output (20) shafts by first engaging selected ones of synchronizer clutches (42, 74, 84) associated with each of a plurality speed ratio gears (44,46,76,78,80) in each path and then alternately engaging a powershift clutch (48, 82) associated with each path. The control system includes a hydraulic logic system (118) which may be electronic and a hydraulic and shift valve system which may be electrically controlled should the logic be electronic. The control system preselects ratio gears in a nondriving path and then alternately engages the powershift clutches to switch driving connections from one path to the other. The logic system includes an improved reverse sequence valve (132) and improved shift valves (124, 126, 128). The shift valve system includes the feature of trimmer valves (364, 370, 372, 374) to control the engagement rate of the synchronizer clutches and combination trimmer valves (360, 366) to control the engagement rate of the powershift clutches. The logic system further includes the feature of a reverse sequence valve (132') for preselecting reverse as a function of speed and independent of the shift selector position.