Control device for an automatic transmission
First Claim
1. A control device for an automatic transmission, said automatic transmission having at least a one-way clutch and achieving a down-shift by applying said one-way clutch, comprising:
- a driving environment detector for detecting a driving environment of a vehicle including said automatic transmission;
a low speed condition detector for detecting that the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission; and
prohibition means for prohibiting a down-shift caused by applying said one-way clutch when said low speed condition means detects that the down-shift is indicated.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention offers a control device for an automatic transmission mounted on a vehicle which prevents a shock caused by sudden working of a one-way clutch, when the vehicle accelerates after a deceleration near an intersection or in an intersection. The control device includes an automatic transmission having at least a one-way clutch and achieving a down-shift by applying the one-way clutch, a driving environment detector, a low speed condition detector, and a prohibition means. The driving environment detector detects a driving environment of a vehicle including the automatic transmission. The low speed condition detector detects when the vehicle approaches or enters into a place indicative of a down-shift of the automatic transmission, and the prohibition means prohibits a down-shift caused by applying the one-way clutch when the low speed condition detector detects that the down-shift is indicated.
26 Citations
20 Claims
-
1. A control device for an automatic transmission, said automatic transmission having at least a one-way clutch and achieving a down-shift by applying said one-way clutch, comprising:
-
a driving environment detector for detecting a driving environment of a vehicle including said automatic transmission;
a low speed condition detector for detecting that the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission; and
prohibition means for prohibiting a down-shift caused by applying said one-way clutch when said low speed condition means detects that the down-shift is indicated. - View Dependent Claims (2, 3, 4, 5)
a speed determinater for determining whether the vehicle speed is lower than a predetermined speed; and
permission means for permitting a down-shift to a next lower gear when said speed determinater determines that the vehicle speed is lower than said predetermined speed.
-
-
6. A control device for an automatic transmission, said automatic transmission having at least a one-way clutch and achieving a down-shift from the 2nd gear to the 1st gear by applying said one-way clutch, comprising:
-
a driving environment detector for detecting a driving environment of a vehicle including said automatic transmission;
a low speed condition detector for detecting that the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission; and
prohibition means for prohibiting a down-shift from the 2nd gear to the 1st gear when said low speed condition means detects that the down-shift is indicated. - View Dependent Claims (7, 8, 9, 10)
a speed determinater for determining whether the vehicle speed is lower than a predetermined speed; and
permission means for permitting a down-shift to the 1st gear when said speed determinater determines that the vehicle speed is lower than said predetermined speed.
-
-
11. A control method for an automatic transmission, said automatic transmission having at least a one-way clutch and achieving a down-shift by applying said one-way clutch, comprising:
-
detecting a driving environment of a vehicle including said automatic transmission;
detecting a low speed condition that the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission; and
prohibiting a down-shift caused by applying said one-way clutch when said low speed condition is detected and the down-shift is indicated. - View Dependent Claims (12, 13, 14, 15)
prohibiting a down-shift when an intersection is detected ahead of the vehicle.
-
-
13. The control method for an automatic transmission according to claim 11, further comprising:
prohibiting a down-shift when a distance between the vehicle and an intersection ahead of the vehicle is less than a predetermined value.
-
14. The control method for an automatic transmission according to claim 11, further comprising:
prohibiting a down-shift when the vehicle is approaching or entering into a place requiring a down-shift of said automatic transmission and the vehicle is decelerating.
-
15. The control method for an automatic transmission according to claim 11, further comprising:
-
determining whether the vehicle speed is lower than a predetermined speed; and
permitting a down-shift when the vehicle speed condition is lower than said predetermined speed.
-
-
16. A control method for an automatic transmission, said automatic transmission having a one-way clutch and achieving a down-shift from the 2nd gear to the 1st gear by applying said one-way clutch, comprising:
-
detecting a driving environment of a vehicle including said automatic transmission;
detecting a low speed condition that the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission; and
prohibiting a down-shift from the 2nd gear to the 1st gear when said low speed condition is detected and the down-shift is indicated. - View Dependent Claims (17, 18, 19, 20)
prohibiting a down-shift from the 2nd gear to the 1st gear when an intersection is detected ahead of the vehicle.
-
-
18. The control method for an automatic transmission according to claim 16, further comprising:
prohibiting a down-shift from the 2nd gear to the 1st gear when a distance between the vehicle and an intersection ahead of the vehicle is less than a predetermined value.
-
19. The control method for an automatic transmission according to claim 16, further comprising:
prohibiting a down-shift from the 2nd gear to the 1st gear when the vehicle is approaching or entering into a place indicative of a down-shift of said automatic transmission and the vehicle is decelerating.
-
20. The control method for an automatic transmission according to claim 16, further comprising:
-
determining whether the vehicle speed is lower than a predetermined speed; and
permitting a down-shift to the 1st gear when the vehicle speed is lower than said predetermined speed.
-
Specification