IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0643785
(2006-12-22)
|
등록번호 |
US-7618344
(2009-11-27)
|
우선권정보 |
JP-2005-378389(2005-12-28); JP-2005-378390(2005-12-28); JP-2005-378391(2005-12-28) |
발명자
/ 주소 |
- Hayashi, Takayuki
- Yamaguchi, Tetsuya
- Noda, Kazuyuki
- Todo, Minoru
- Ozaki, Kazuhisa
- Nozaki, Kazutoshi
- Honda, Atsushi
|
출원인 / 주소 |
- Aisin AW Co., Ltd.
- Toyota Jidosha Kabushiki Kaisha
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
5 |
초록
▼
A hydraulic control apparatus for a multi-stage automatic transmission includes solenoid valves such as the linear solenoid valves that are formed as normally closed valves. A first clutch apply relay valves that outputs a forward range pressure as a reverse input pressure during an all-solenoid-off
A hydraulic control apparatus for a multi-stage automatic transmission includes solenoid valves such as the linear solenoid valves that are formed as normally closed valves. A first clutch apply relay valves that outputs a forward range pressure as a reverse input pressure during an all-solenoid-off mode, and a second clutch apply relay valve that switches between a left half position that inputs a reverse input pressure to a discharge port and a right half position that inputs the reverse pressure to the discharge port are provided. The second clutch apply relay valve is set to the right half position during normal engine startup and locked based on the lock pressure by feeding the line pressure as a lock pressure and is set at the left half position that interrupts the lock pressure after the engine is restarted during all-solenoids-off.
대표청구항
▼
What is claimed is: 1. A hydraulic control apparatus, for a multi-stage automatic transmission, having a plurality of shift speeds according to an engagement state of a plurality of friction engagement elements that are engaged and disengaged by respective hydraulic servos, the hydraulic control ap
What is claimed is: 1. A hydraulic control apparatus, for a multi-stage automatic transmission, having a plurality of shift speeds according to an engagement state of a plurality of friction engagement elements that are engaged and disengaged by respective hydraulic servos, the hydraulic control apparatus comprising: an oil pump that generates an oil pressure in correspondence with the engine speed; a line pressure generating device that generates an oil pressure in the oil pump at a line pressure; a range pressure output device that can input the line pressure and output a forward range pressure based on a shift position; a first hydraulic servo among the respective hydraulic servos that engages and disengages a respective one of the friction engagement elements that engages at a relatively low speed; a second hydraulic servo among the respective hydraulic servos that engages and disengages a respective one of the friction engagement elements that engages at a relatively high speed; a plurality of engagement pressure control solenoid valves that include a first engagement pressure control solenoid valve that supplies an engagement pressure to the first hydraulic servo, and a second engagement pressure control solenoid valve that supplies the engagement pressure to the second hydraulic servo, wherein, when in a de-energized state, the plurality of engagement pressure control solenoid valves interrupt an input port that inputs oil pressure based on the line pressure and an output port and communicate the output port and a discharge port, and, when in an energized state, the plurality of engagement pressure control solenoid valves communicate the input port and the output port to thereby regulate the engagement pressure supplied to the respective hydraulic servos; a first switching valve that, during a failure in which all solenoid valves are de-energized, is switched to a reverse input pressure generating position that outputs the forward range pressure as a reverse input pressure; and a second switching valve that switches between a first position at which the reverse input pressure is input to the discharge port of the first engagement pressure control solenoid valve and a second position at which the reverse input pressure is input to the discharge port of the second engagement pressure control solenoid valve; wherein: the second switching valve is set at the second position during a normal engine startup and is locked at the second position based on a lock pressure by feeding the lock pressure, and during a failure in which all solenoid valves are de-energized, is set to a first position that interrupts the lock pressure after the engine is restarted. 2. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 1, wherein the second switching valve provides the lock pressure by feeding the line pressure when in the second position. 3. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 2, further comprising: a fail solenoid valve that outputs a signal pressure in the de-energized state and interrupts the signal pressure after being set to an energized state at least during the normal engine start-up; wherein: the second switching valve inputs a signal pressure of the fail solenoid valve before being locked by the lock pressure and switches to the first position due to the signal pressure during the failure in which all of the solenoid valves are de-energized. 4. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 3, further comprising a delay device that communicates with the second switching valve by delaying the lock pressure that is fed by the second switching valve. 5. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 4, wherein the delay device includes a third switching valve that switches between an urging position that is urged by a first urging device and a communicating position that communicates the lock pressure to the second switching valve when the lock pressure is input against the urging of the first urging device. 6. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 5, wherein: the second switching valve comprises a second spool that switches between the first position and the second position; the third switching valve comprises a third spool that switches between the urging position and the communicating position, and is disposed so as to be able to abut the second spool concentrically; and the second spool of the second switching device is set to the second position due to the abutment of the third spool when the third spool of the third switching valve is in the urging position. 7. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 4, wherein the delay device includes a third switching valve that switches between an urging position that is urged by a first urging device and a communicating position that communicates the lock pressure to the second switching valve when the forward range pressure is input against the urging of the first urging device. 8. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 7, wherein: the second switching valve comprises a second spool that switches between the first position and the second position; the third switching valve comprises a third spool that switches between the urging position and the communicating position, and is disposed so as to be able to abut the second spool concentrically; and the second spool of the second switching device is set to the second position due to the abutment of the third spool when the third spool of the third switching valve is in the urging position. 9. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 3, wherein: the first switching valve switches between an interrupt position that interrupts the forward range pressure by being urged by a second urging device and a reverse input pressure output position that communicates and outputs the forward range pressure as reverse input pressure when the signal pressure of the fail solenoid valve is input against the urging of the second urging device. 10. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 1, further comprising: a fail solenoid valve that outputs a signal pressure in the de-energized state and interrupts the signal pressure after being set to an energized state at least during the normal engine start-up; wherein: the second switching valve inputs a signal pressure of the fail solenoid valve before being locked by the lock pressure and switches to the first position due to the signal pressure during the failure in which all of the solenoid valves are de-energized. 11. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 10, further comprising a delay device that communicates with the second switching valve by delaying the lock pressure that is fed by the second switching valve. 12. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 11, wherein the delay device includes a third switching valve that switches between an urging position that is urged by a first urging device and a communicating position that communicates the lock pressure to the second switching valve when the lock pressure is input against the urging of the first urging device. 13. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 12, wherein: the second switching valve comprises a second spool that switches between the first position and the second position; the third switching valve comprises a third spool that switches between the urging position and the communicating position, and is disposed so as to be able to abut the second spool concentrically; and the second spool of the second switching device is set to the second position due to the abutment of the third spool when the third spool of the third switching valve is in the urging position. 14. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 11, wherein the delay device includes a third switching valve that switches between an urging position that is urged by a first urging device and a communicating position that communicates the lock pressure to the second switching valve when the forward range pressure is input against the urging of the first urging device. 15. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 14, wherein: the second switching valve comprises a second spool that switches between the first position and the second position; the third switching valve comprises a third spool that switches between the urging position and the communicating position, and is disposed so as to be able to abut the second spool concentrically; and the second spool of the second switching device is set to the second position due to the abutment of the third spool when the third spool of the third switching valve is in the urging position. 16. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 10, wherein: the first switching valve switches between an interrupt position that interrupts the forward range pressure by being urged by a second urging device and a reverse input pressure output position that communicates and outputs the forward range pressure as reverse input pressure when the signal pressure of the fail solenoid valve is input against the urging of the second urging device. 17. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 1, further comprising: a third hydraulic servo that engages and disengages a friction engagement element that is engaged at the relatively low speed and the relatively high speed; wherein: the plurality of engagement pressure control solenoid valves include a third engagement pressure control solenoid valve that supplies the engagement pressure to the third hydraulic servo; and the first switching valve outputs the reverse input pressure directly to the discharge port of the third engagement pressure control solenoid valve during the failure in which all of the solenoid valves are de-energized. 18. The hydraulic control apparatus, for the multi-stage automatic transmission, according to claim 1, further comprising: a fourth hydraulic servo that engages and disengages a friction engagement element that engages at a shift speed that is different from the relatively low speed and the relatively high speed; wherein: the plurality of engagement pressure control solenoid valves include a fourth engagement pressure control solenoid valve that supplies the engagement pressure to the fourth hydraulic servo; and the fourth engagement pressure control solenoid valve inputs the lock pressure to the input port via the second switching valve as the line pressure.
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