CONTROL APPARATUS AND CONTROL METHOD FOR AUTOMATIC TRANSMISSION

• US 20100222974A1
• Filed: 08/24/2006
• Published: 09/02/2010
• Est. Priority Date: 09/07/2005
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Watanabe, Kazuyuki, Nakamura, Kazuaki
• Application Number:
  US11/997,381
• Publication Number:
  US 20100222974A1
• Time in Patent Office: Days
• US Class Current: 701/62
• CPC Class Codes: F16H 2061/0239 Selecting ratios for preventing or cancelling wheel slip
• CPC Class Codes: F16H 2061/044 when a freewheel device is disengaged or bridged
• CPC Class Codes: F16H 59/66 Road conditions, e.g. slope, slippery
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 61/16 Inhibiting or initiating shift during unfavourable conditions, e.g. preventing forward reverse shift at high vehicle speed, preventing engine over speed unintentional control input F16H61/18

Abstract

An ECU executes a program including the step (S130) of inhibiting, in a traveling state where a one-way clutch F may engage as in driven state in first gear (YES in S100, YES in S110), normal gear-shifting control under which a gear to be implemented is determined based on the output shaft revolution number NO, in the case where the degree of change ΔNO by which the output shaft revolution number NO changes in a predetermined time period is larger than a threshold value Δ NO (1) (YES in S120) and thus it is regarded that popping could occur due to free turning of drive wheels, and the step (S140) of forcing the gear to be shifted to a gear except for first gear implemented by engagement of the one-way clutch F.

Claims

1. A control apparatus for an automatic transmission implementing a gear by engagement of any of a plurality of frictional engagement elements (3610, 3620, 3630, 3640, 3650), at least any one of gears to be implemented being implemented by engagement of a restraining member (3660) allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

a sensing unit (8014) sensing the number of revolutions of an output shaft of said automatic transmission (2000);

a first control unit (8000) controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented that is different from the gear implemented by the engagement of said restraining member (3660);

a second control unit (8000) controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft; and

an inhibiting unit (8000) inhibiting the control by said second control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

2. The control apparatus for the automatic transmission according to claim 1, said control apparatus further comprising:

a stopping unit stopping the control by said first control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change under the condition that the control by said first control unit (8000) is executed while the control by said second control unit (8000) is inhibited; and

a canceling unit canceling the inhibition of the control by said second control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most the degree of change smaller than said predetermined degree of change under the condition that the control by said first control unit (8000) is executed while the control by said second control unit (8000) is inhibited.

3. A control apparatus for an automatic transmission (2000) implementing a gear by engagement of any of a plurality of frictional engagement elements, at least any one of gears to be implemented being implemented by engagement of a restraining member (3660) allowing rotation of an outer race and an inner race with respect to each, other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), and a difference in number of revolutions between said outer race and said inner race being suppressed by engagement of at least any one of a plurality of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

a sensing unit (8014) sensing the number of revolutions of an output shaft of said automatic transmission (2000);

a first control unit (8000) controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that the difference in number of revolutions between said outer race and said inner race is suppressed;

a second control unit (8000) controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft; and

an inhibiting unit (8000) inhibiting the control by said second control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

4. The control apparatus for the automatic transmission according to claim 3, said control apparatus further comprising a third control unit controlling, in the case where the control by said second control unit (8000) is inhibited, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on an average of the number of revolutions of said output shaft in a predetermined time period.

5. The control apparatus for the automatic transmission according to claim 3, said control apparatus further comprising:

a stopping unit stopping the control by said first control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change under the condition that the control by said first control unit (8000) is executed while the control by said second control unit (8000) is inhibited; and

a canceling unit canceling the inhibition of the control by said second control unit (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most the degree of change smaller than said predetermined degree of change under the condition that the control by said first control unit (8000) is executed while the control by said second control unit (8000) is inhibited.

6. A control apparatus for an automatic transmission implementing a gear by engagement of any of a plurality of frictional engagement elements (3610, 3620, 3630, 3640, 3650), at least any one of gears to be implemented being implemented by engagement of a restraining member (3660) allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

sensing means (8014) for sensing the number of revolutions of an output shaft of said automatic transmission (2000);

first control means (8000) for controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented that is different from the gear implemented by the engagement of said restraining member (3660);

second control means (8000) for controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft; and

inhibiting means (8000) for inhibiting the control by said second control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

7. The control apparatus for the automatic transmission according to claim 6, said control apparatus further comprising:

means for stopping the control by said first control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change under the condition that the control by said first control means (8000) is executed while the control by said second control means (8000) is inhibited; and

means for canceling the inhibition of the control by said second control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most the degree of change smaller than said predetermined degree of change under the condition that the control by said first control means (8000) is executed while the control by said second control means (8000) is inhibited.

8. A control apparatus for an automatic transmission (2000) implementing a gear by engagement of any of a plurality of frictional engagement elements, at least any one of gears to be implemented being implemented by engagement of a restraining member (3660) allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), and a difference in number of revolutions between said outer race and said inner race being suppressed by engagement of at least any one of a plurality of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

sensing means (8014) for sensing the number of revolutions of an output shaft of said automatic transmission (2000);

first control means (8000) for controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that the difference in number of revolutions between said outer race and said inner race is suppressed;

second control means (8000) for controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft; and

inhibiting means (8000) for inhibiting the control by said second control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

9. The control apparatus for the automatic transmission according to claim 8, said control apparatus further comprising means for controlling, in the case where the control by said second control means (8000) is inhibited, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on an average of the number of revolutions of said output shaft in a predetermined time period.

10. The control apparatus for the automatic transmission according to claim 8, said control apparatus further comprising:

means for stopping the control by said first control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change under the condition that the control by said first control means (8000) is executed while the control by said second control means (8000) is inhibited; and

means for canceling the inhibition of the control by said second control means (8000), in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most the degree of change smaller than said predetermined degree of change under the condition that the control by said first control means (8000) is executed while the control by said second control means (8000) is inhibited.

11. A control apparatus for an automatic transmission implementing a gear by engagement of any of a plurality of frictional engagement elements (3610, 3620, 3630, 3640, 3650), at least any one of gears to be implemented being implemented by engagement of a one-way clutch (3660) allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

an output shaft revolution number sensor (8014) sensing the number of revolutions of an output shaft of said automatic transmission (2000); and

an ECU (8000),

said ECU (8000) controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented that is different from the gear implemented by the engagement of said one-way clutch (3660),

said ECU (8000) controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft, and

said ECU (8000) inhibiting the control by said ECU (8000) of said frictional engagement elements so that a gear is implemented based on the number of revolutions of said output shaft, in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

12. A control apparatus for an automatic transmission (2000) implementing a gear by engagement of any of a plurality of frictional engagement elements, at least any one of gears to be implemented being implemented by engagement of a one way clutch (3660) allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), and a difference in number of revolutions between said outer race and said inner race being suppressed by engagement of at least any one of a plurality of said frictional engagement elements (3610, 3620, 3630, 3640, 3650), said control apparatus comprising:

an output shaft revolution number sensor (8014) sensing the number of revolutions of an output shaft of said automatic transmission (2000); and

an ECU (8000),

said ECU (8000) controlling, in the case where a degree of change by which the number of revolutions of said output shaft changes in a predetermined time period is larger than a predetermined degree of change, said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that the difference in number of revolutions between said outer race and said inner race is suppressed,

said ECU (8000) controlling said frictional engagement elements (3610, 3620, 3630, 3640, 3650) so that a gear is implemented based on the number of revolutions of said output shaft, and

said ECU (8000) inhibiting the control by said ECU (8000) of said frictional engagement elements so that a gear is implemented based on the number of revolutions of said output shaft, in the case where said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than the predetermined degree of change.

13. A control method for an automatic transmission implementing a gear by engagement of any of a plurality of frictional engagement elements, at least any one of gears to be implemented being implemented by engagement of a restraining member allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements, said control method comprising the steps of:

determining whether or not a degree of change by which the number of revolutions of an output shaft of said automatic transmission changes in a predetermined time period is larger than a predetermined degree of change; and

inhibiting gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft and controlling said frictional engagement elements so that a gear is implemented that is different from the gear implemented by the engagement of said restraining member, in the case where it is determined that said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than said predetermined degree of change.

14. The control method for the automatic transmission according to claim 13, further comprising the steps of:

determining, when the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft is inhibited and said frictional engagement elements are controlled so that a gear is implemented that is different from the gear implemented by the engagement of said restraining member, whether or not said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change; and

canceling the inhibition of the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft, in the case where it is determined that said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change, when the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft is inhibited and said frictional engagement elements are controlled so that a gear is implemented that is different from the gear implemented by the engagement of said restraining member.

15. A control method for an automatic transmission implementing a gear by engagement of any of a plurality of frictional engagement elements, at least any one of gears to be implemented being implemented by engagement of a restraining member allowing rotation of an outer race and an inner race with respect to each other in one direction and restraining rotation thereof in the opposite direction, in addition to the engagement of said frictional engagement elements, and a difference in number of revolutions between said outer race and said inner race being suppressed by engagement of at least any one of a plurality of said frictional engagement elements, said control method comprising the steps of:

determining whether or not a degree of change by which the number of revolutions of an output shaft of said automatic transmission changes in a predetermined time period is larger than a predetermined degree of change; and

inhibiting gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft and controlling said frictional engagement elements so that the difference in number of revolutions between said outer race and said inner race is suppressed, in the case where it is determined that said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is larger than said predetermined degree of change.

16. The control method for the automatic transmission according to claim 15, further comprising the step of executing gear-shifting control under which a gear to be implemented is determined based on an average of the number of revolutions of said output shaft in a predetermined time period, in the case where the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft is inhibited.

17. The control method for the automatic transmission according to claim 15, further comprising the steps of:

determining, when the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft is inhibited and said frictional engagement elements are controlled so that the difference in number of revolutions between said outer race and said inner race is suppressed, whether or not said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change; and

stopping the control of said frictional engagement elements for suppressing the difference in number of revolutions between said outer race and said inner race and canceling the inhibition of the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft, in the case where it is determined that said degree of change by which the number of revolutions of said output shaft changes in the predetermined time period is at most a degree of change smaller than said predetermined degree of change, when the gear-shifting control under which a gear to be implemented is determined based on the number of revolutions of said output shaft is inhibited and said frictional engagement elements are controlled so that the difference in number of revolutions between said outer race and said inner race is suppressed.