Hydraulic control system for transmissions

• US 6,514,175 B2
• Filed: 05/17/2001
• Issued: 02/04/2003
• Est. Priority Date: 05/19/2000
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Tamura, Tadashi, Hattori, Yuji, Habuchi, Ryoji, Morioka, Hiroshi, Matsuo, Kenji, Kondo, Hiroki, Taniguchi, Hiroji, Yasue, Hideki, Kono, Katsumi
• Primary Examiner(s): Lorence, Richard M.
• Assistant Examiner(s): HO, HA DINH
• Application Number:
  US09/858,452
• Publication Number:
  US 20010044361A1
• Time in Patent Office: 628 Days
• Field of Search: 477/44, 477/45, 477/46, 477/50, 477/115, 477/121, 477/127, 477/138, 477/156, 477/157, 477/158, 477/159, 477/160, 475/159, 475/161
• US Class Current: 477/156
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/111 with separate change-speed gear trains arranged in series
• CPC Class Codes: F16H 2061/0087 Adaptive control, e.g. the control parameters adapted by learning
• CPC Class Codes: F16H 61/0021 Generation or control of line pressure
• CPC Class Codes: F16H 61/662 with endless flexible members

Abstract

A hydraulic control system including: a rotating speed raising unit for raising the rotating speed of the prime mover while the transmission is not rotated by the prime mover, to increase an output volume of the hydraulic pump; at oil pressure instructor for outputting a plurality of instruction signals of different pressure instruction values to the valve modulating mechanism while the output volume of the hydraulic pump is increased; an oil pressure detector for detecting the oil pressure to be modulated and fed to the transmission, at a plurality of pressure levels; and a learning corrector for learning and correcting the instruction signals on the basis of the outputted pressure instruction value and the detected oil pressure detected.

Claims

1. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising:

rotating speed raiser for raising a rotating speed of said prime mover while said transmission is not rotated by said prime mover, to increase an output volume of said hydraulic pump;

oil pressure instructor for outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

oil pressure detector for detecting the oil pressure to be modulated and fed to said transmission, at a plurality of pressure levels; and

learning and correction unit for learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructor and the oil pressure detected by said oil pressure detector.

2. A hydraulic control system according to claim 1,

wherein said rotating speed raiser raises the rotating speed of said prime mover to a predetermined rotating speed larger than the rotating speed at which said hydraulic pump outputs an oil pressure higher than the highest pressure used in said transmission.

3. A hydraulic control system according to claim 1, further comprising:

learning instructor for outputting instructions to execute, for a predetermined time period;

the increase in the rotating speed of said prime mover by said rotating speed raiser;

the output of the instruction signal of the pressure instruction value to said pressure modulating mechanism by said oil pressure instructor;

the detection of the oil pressure by said oil pressure detector; and

the learning and correction of said instruction signals by said learning and correction unit.

4. A hydraulic control system according to claim 3,

wherein said predetermined time period is a term before a vehicle having said transmission mounted thereon is shipped from a factory.

5. A hydraulic control system according to claim 1, further comprising:

rounding oil pressure instructor for outputting an instruction signal to instruct an oil pressure higher than that to be used for said learning and correction, before said oil pressure instructor outputs the instruction signal for instructing the oil pressure to be used in said learning and correction.

6. A hydraulic control system according to claim 1, further comprising:

corrector for correcting the pressure instruction value for said pressure modulating mechanism in an oil pressure increasing side, before the output volume of said hydraulic pump is increased by said rotating speed raiser to make the learning and correction by said learning and correction unit, thereby to feed an oil pressure higher than the pressure instruction value to the transmission.

7. A hydraulic control system according to claim 1,

wherein said pressure modulating mechanism has a non-modulating range in which the output oil pressure accompanying the change in said instruction signal does not change, and

wherein said oil pressure instructor outputs an oil pressure other than an oil pressure in said non-modulating range, as the pressure instruction value.

8. A hydraulic control system according to claim 1, further comprising:

judger for judging that at least one of the rotating speed of said prime mover and its fluctuation is within predetermined ranges which are preset according to individuals,

wherein said oil pressure instructor outputs said plurality of instruction signals where the rotating speed of said prime mover or its fluctuation falls within the individual predetermined ranges.

9. A hydraulic control system according to claim 1,

wherein said oil pressure instructor includes means for outputting an instruction signal at a predetermined pressure instruction value in a rising procedure of output oil pressure of said pressure modulating mechanism, and an instruction signal at a predetermined pressure instruction value in a falling procedure of the output oil pressure of said pressure mechanism, and

wherein said oil pressure detector detects an oil pressure according to said pressure instruction value in the rising procedure of the output oil pressure of said pressure modulating mechanism and an oil pressure according to said pressure instruction value in the falling procedure of the output oil pressure of said pressure modulating mechanism.

10. A hydraulic control system according to claim 1,

wherein said pressure instruction value includes at least any two of the highest pressure value in a using range of said transmission, an average oil pressure value in an ordinary running state which is the most frequent for the vehicle having said transmission mounted thereon, and the lowest pressure value in the range of said transmission.

11. A hydraulic control system according to claim 1, further comprising:

inhibiter for inhibiting the learning and correction by said learning and correction unit, where either a deviation between said pressure instruction value and the oil pressure detected by said oil pressure detector or the learning and correction based on said pressure instruction value and the oil pressure detected by said oil pressure detector is higher than a predetermined value.

12. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmissions, comprising a controller which executes control of:

raising a rotating speed of said prime mover while said transmission is not rotated by said prime mover, to increase an output volume of said hydraulic pump;

oil pressure instructing for outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission, at said plurality of pressure levels; and

learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said detect oil pressure instructing control and the oil pressure detected by said oil pressure detecting control.

13. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising steps of:

raising a rotating speed of said prime mover while said transmission is not rotated by said prime mover, to increase an output volume of said hydraulic pump;

outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission, at said plurality of pressure levels; and

learning and correcting said instruction signals on the basis of to outputted pressure instruction value and the detected oil pressure.

14. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising:

oil pressure instructor for outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism to output an oil pressure at a predetermined pressure level;

oil pressure detector for detecting the oil pressure to be modulated and fed to said transmission, at a plurality of pressure levels;

learning and correction unit for learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructor and the oil pressure detected by said oil pressure detector; and

rotating speed raiser for raising the rotating speed of said prime mover when an output timing of said oil pressure instructor is detected.

15. A hydraulic control system for generating an oil pressure from a hydraulic pump by turning a prime mover, as connected to a transmission capable of selecting a non-running shift position transmitting no power and said hydraulic pump, and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to said transmission in a vehicle comprising:

rotating speed raiser for raising the rotating speed of said prime mover, while said non-running shift position is selected and/or where the vehicle is stopped, to increase an output volume of said hydraulic pump;

oil pressure instructor for outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

oil pressure detector for detecting the oil pressure to be modulated and fed to said transmission, at said plurality of pressure levels; and

learning and correction unit for learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructor and the oil pressure detected by said oil pressure detector.

16. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising:

vehicle speed detector for detecting the speed of a vehicle having said transmission mounted thereon;

oil pressure instructor for outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism, when the vehicle speed detected by said vehicle speed detector is higher than a predetermined reference vehicle speed and is stable, to output oil pressures at a plurality of pressure levels;

oil pressure detector for detecting the oil pressure to be modulated and fed to said transmission; and

learning and correction unit for learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructor and the oil pressure detected by said oil pressure detector.

17. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising a controller which executes controls of:

outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism to output an oil pressure at a predetermined pressure level;

detecting the oil pressure to be modulated and fed to said transmission, at a plurality of pressure levels;

learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructing control and the oil pressure detected by said oil pressure detecting control; and

raising the rotating speed of said prime mover when an output timing of said oil pressure instructing control is detected.

18. A hydraulic control system for generating an oil pressure from a hydraulic pump by turning a prime mover, as connected to a transmission capable of select a non-running shift position transmitting no power and said hydraulic pump, and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to said transmission in a vehicle comprising a controller which executes controls of:

raising the rotating speed of said prime mover, while said non-running shift position is selected and/or where the vehicle is stopped, to increase an output volume of said hydraulic pump;

outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission, at said plurality of pressure levels; and

learning and correcting said instruction signals on the basis of the mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising steps of;

outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism to output an oil pressure at a predetermined pressure level;

detecting the oil pressure to be modulated and fed to said transmission, at a plurality of pressure levels;

learning and correcting said instruction signals on the basis of the pressure instruction value outputted at said oil pressure instructing step and the oil pressure detected at said oil pressure detecting step; and

raising the rotating speed of said prime mover when an output timing of said oil pressure instructing step is detected.

19. A hydraulic control system for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising a controller which executes controls of:

detecting the speed of a vehicle having said transmission mounted thereon;

outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism, when the vehicle speed detected by said vehicle speed detecting control is higher than a predetermined reference vehicle speed and is stable, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission; and

learning and correcting said instruction signals on the basis of the pressure instruction value outputted by said oil pressure instructing control and the oil pressure detected by said oil pressure detecting control.

20. A hydraulic control method for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising steps of:

outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism to output an oil pressure at a predetermined pressure level;

detecting the oil pressure to be modulated and fed to said transmission, at a plurality of pressure levels;

learning and correcting said instruction signals on the basis of the pressure instruction value outputted at said oil pressure instructing step and the oil pressure detected at said oil pressure detecting step; and

raising the rotating speed of said prime mover when an output timing of said oil pressure instructing step is detected.

21. A hydraulic control method for generating an oil pressure from a hydraulic pump by turning a prime mover, as connected to a transmission capable of selecting a non-running shift position transmitting no power and said hydraulic pump, and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to said transmission in a vehicle comprising steps of:

raising the rotating speed of said prime mover, while said non-running shift position is selected and/or where the vehicle is stopped, to increase an output volume of said hydraulic pump;

outputting a plurality of instruction signals of different pressure instruction values to said pressure modulating mechanism while the output volume of said hydraulic pump is increased, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission, at said plurality of pressure levels; and

learning and correcting said instructing signals on the basis of the pressure instruction value outputted at said oil pressure instruction step and the oil pressure detected at said oil pressure detecting step.

22. A hydraulic control method for generating an oil pressure by turning a prime mover connected to a hydraulic pump and for outputting an oil pressure instruction signal to an electrically activated pressure modulating mechanism, to modulate the oil pressure generated in said hydraulic pump to an oil pressure according to the instruction signal and to feed the modulated oil pressure to a transmission, comprising steps of:

detecting the speed of a vehicle having said transmission mounted thereon;

outputting an instruction signal at a predetermined pressure instruction value to said pressure modulating mechanism, when the vehicle speed detected by said vehicle speed detecting step is higher than a predetermined reference vehicle speed and is stable, to output oil pressures at a plurality of pressure levels;

detecting the oil pressure to be modulated and fed to said transmission; and

learning and correcting said instruction signals on the basis of the pressure instruction value outputted at said oil pressure instructing step and the oil pressure detected at said oil pressure detecting step.