Control device for a synchromesh automatic transmission

Abstract

A control device for a synchromesh automatic transmission comprising: an input shaft 13 driven by a combustion engine 1 ; an output shaft 16 coupled to the input shaft 13 by gears; a plurality of groups of transmission gears 17 through 21 having different gear ratios and interposed between the input shaft 13 and the output shaft 16 ; sleeve gears 22 a , 22 b , and 22 c coupling any one of the transmission gears 17 through 21 with the output shaft 16 ; a shifting and selecting actuator 5 operating the sleeve gears 22 a , 22 b , and 22 c ; a shifting and selecting position sensor 6 detecting control inputs in a shifting direction and a selecting direction; and a control unit 4 instructing operations to the above components, wherein the control unit judges whether or not a position of completing the operations is within a range of a target position based on an output from the shifting and selecting position sensor 6 at time of finishing the gear changing operation.

What is claimed is:  
     
         1 . A control device for a synchromesh automatic transmission comprising: 
 an input shaft coupled with a crank shaft of a combustion engine;    an output shaft coupled to the input shaft by gears;    a plurality of groups of transmission gears having different gear ratios and interposed between the input shaft and the output shaft;    a coupling mechanism selectively coupling one of the plurality of groups of the transmission gears with the output shaft;    a shifting and selecting actuator operating the coupling mechanism in shifting and selecting directions;    a shifting position sensor detecting a control input in the shifting direction by the shifting and selecting actuator;    a selecting position sensor detecting a control input in the selecting direction by the shifting and selecting actuator; and    a control unit instructing an operation to the shifting and selecting actuator,    wherein the control unit detects a position of completing the operation from outputs from the shifting and selecting position sensors after finishing a gear changing operation, and judges whether or not the position of completing the operation is within a range of target position in order to finish the operation.    
     
     
         2 . A control device for a synchromesh automatic transmission comprising: 
 an input shaft coupled to a crankshaft of a combustion engine through a clutch mechanism;    an output shaft coupled to the input shaft by gears;    a plurality of groups of transmission gears having different gear ratios and interposed between the input shaft and the output shaft;    a coupling mechanism selectively coupling one of the plurality of groups of the transmission gears and the output shaft;    a shifting and selecting actuator operating the coupling mechanism in shifting and selecting directions;    an input shaft rotational speed sensor detecting a rotational speed of the input shaft;    an output shaft rotational speed sensor detecting a rotational speed of the output shaft; and    a control unit commanding an operation to the shifting and selecting actuator,    wherein the control unit calculates a target ratio of the rotational speeds of the input shaft and the output shaft from a gear ratio of transmission gears, which are newly engaged after finishing a gear changing operation, judges whether or not a rotational speed ratio obtained from outputs of the input shaft rotational speed sensor and the output shaft rotational speed sensor is within the target rotational speed ratio, and makes the operation complete.    
     
     
         3 . A control device for a synchromesh automatic transmission comprising: 
 an input shaft coupled to a crankshaft of a combustion engine through a clutch mechanism;    an output shaft coupled to the input shaft by gears;    a plurality of groups of transmission gears having different gear ratios and interposed between the input shaft and the output shaft, and one of the groups of the transmission gears is for a reverse driving;    a coupling mechanism selectively coupling one of the plurality of groups of the transmission gears with the output shaft;    a shifting and selecting actuator operating the coupling mechanism in shifting and selecting directions;    a reverse driving detecting means detecting an incident that the coupling mechanism is coupled with the transmission gears for the reverse driving;    a control unit instructing an operation to the shifting and selecting actuator; and    a shifting lever, through which an operator transmits operating conditions to the control unit,    wherein the control unit compares an instruction signal by the shifting lever with a detecting signal from the reverse driving detecting means after finishing a gear changing operation, judges whether or not the instruction signal and the detecting signal match, and finishes the operation.    
     
     
         4 . The control device for the synchromesh automatic transmission according to  claim 1 , 
 wherein when the control unit judges that the position of completing the operation is not within the range of target position, the gear changing operation is repeated.    
     
     
         5 . The control device for the synchromesh automatic transmission according to  claim 2 , 
 wherein when the control unit judges that the rotational speed ratio is not within the range of the target rotational speed ratio, the gear changing operation is repeated.    
     
     
         6 . The control device for the synchromesh automatic transmission according to  claim 3 , 
 wherein when the control unit judges that the instruction signal from the shifting lever does not match the detecting signal from the reverse driving detecting means, the gear changing operation is repeated.