Shift capacity control for automatic transmission
First Claim
Patent Images
1. A system for controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the system comprising:
- means for sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed;
means for determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined;
means for determining a state of a time variation in said revolution of the prime mover after said shift command signal is generated and generating a state signal indicative of said state determined;
means for determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said state signal and generating a propriety signal indicative of said propriety determined; and
means for controlling an engagement capacity of the friction element to be operated during a subsequent period of shifting in response to said propriety signal.
1 Assignment
0 Petitions
Accused Products
Abstract
A shift capacity control system for an automatic transmission is constructed to determine a state of an engine speed difference after occurrence of a shift command, determine a propriety of a shift capacity of the automatic transmission in response to the state determined, and control an engagement capacity of a friction element to be operated during a period of shifting in response to the propriety determined.
-
Citations
60 Claims
-
1. A system for controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the system comprising:
-
means for sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed; means for determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; means for determining a state of a time variation in said revolution of the prime mover after said shift command signal is generated and generating a state signal indicative of said state determined; means for determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said state signal and generating a propriety signal indicative of said propriety determined; and means for controlling an engagement capacity of the friction element to be operated during a subsequent period of shifting in response to said propriety signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
-
-
29. A method of controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the method comprising the steps of:
-
sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed; determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; determining a state of a time variation in said revolution of the prime mover after said shift command signal is generated and generating a state signal indicative of said state determined; determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said state signal and generating a propriety signal indicative of said propriety determined; and controlling an engagement capacity of the friction element to be operated during a subsequent period of shifting in response to said propriety signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
-
-
57. A system for controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the system comprising:
-
means for sensing a revolution of the prime mover and generating a revolution signa indicative of said revolution sensed; means for determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; means for determining a time variation in said revolution of the prime mover after said shift command signal is generated and generating a time variation signal indicative of said time variation determined; means for determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said time variation signal and generating a propriety signal indicative of said propriety determined; and means for controlling an engagement capacity of the friction element to be operated during a subsequent period of shifting in response to said propriety signal.
-
-
58. A method of controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the method comprising the steps of:
-
sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed; determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; determining a time variation in said revolution of the prime mover after said shift command signal is generated and generating a time variation signal indicative of said time variation determined; determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said time variation signal and generating a propriety signal indicative of said propriety determined; and controlling an engagement capacity of the friction element to be operated during a subsequent period of shifting in response to said propriety signal.
-
-
59. A system for controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the system comprising;
-
means for sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed; means for determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; means for determining a state of a time variation in said revolution of the prime mover after said shift command signal is generated and generating a state signal indicative of said state determined, said state determining means determining said state in accordance with a length of a shift response time between a point of said shift command and a point that said time variation is changed from a negative to positive for the first time after a lapse of a first set time covering a length from said point of said shift command to commencement of shifting, and before a lapse of a second set time covering a length from said point of said shift command to completion of shifting; means for determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said state signal and generating a propriety signal indicative of said propriety determined; and means for controlling an engagement capacity of the friction element to be operated during a period of shifting of the automatic transmission in response to said propriety signal.
-
-
60. A method of controlling a shift capacity of an automatic transmission for a prime mover, the automatic transmission for a prime mover, the automatic transmission being shiftable by selective engagement of friction elements, the method comprising the steps of:
-
sensing a revolution of the prime mover and generating a revolution signal indicative of said revolution sensed; determining a shift command to the automatic transmission and generating a shift command signal indicative of said shift command determined; determining a state of a time variation in said revolution of the prime mover after said shift command signal is generated and generating a state signal indicative of said state determined, said state determining step being carried out in accordance with a length of a shift response time between a point of said shift command and a point that said time variation is changed form negative to positive for the first time after a lapse of a first set time covering a length from said point of said shift command to commencement of shifting, and before a lapse of a second set time covering a length from said point of said shift command to completion of shifting; determining a propriety of the shift capacity of the automatic transmission during a period of shifting thereof in response to said state signal and generating a propriety signal indicative of said propriety determined; and controlling an engagement capacity of the friction element to be operated during a period of shifting of the automatic transmission in response to said propriety signal.
-
Specification