Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1995-02-13
1997-01-28
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
477144, F16H 5900, F16H 6100, B60K 4100
Patent
active
055973728
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a hydraulic control system of an automatic transmission for an automotive vehicle and more, particularly to a hydraulic control system of automatic transmission wherein line pressure is variably controlled to improve the power train efficiency and the response of shifting time during gear shifting.
2. Description of the Conventional Art
A conventional vehicle automatic transmission has a torque converter and a multiple stage transmission gear mechanism connected with the torque converter, which includes hydraulically actuated friction members for selecting one of the gear stages of the transmission gear mechanism in accordance with vehicle operating conditions.
The hydraulic control system pressurized by a hydraulic pump provides the hydraulic pressure required to operate the friction members and control valves.
A commonly used automatic transmission of a vehicle has a hydraulic torque converter which generally includes a pump impeller connected with an engine output shaft to be driven thereby, a turbine runner with an output shaft member, and a stator disposed between the pump impeller and the turbine runner, so that the fluid is circulated by the engine driven pump impeller through the turbine runner with the aid of the stator which functions to deflect the fluid from the turbine runner to a direction where the fluid flow does not disturb the rotation of the pump impeller when the fluid flows into the pump impeller.
The automatic shift is made by operating the friction members such as clutches or a kick down brake at each shift change. Also, a manual valve of which ports are converted by selecting a position of a selector lever, is designed to be supplied with fluid from a hydraulic pump and to supply the fluid to a shift control valve. In a 4-speed automatic transmission, the shift control valve has an operated port made by an electronic control system.
An example of a hydraulic pressure control system of an automatic transmission for a vehicle will be described with reference to FIG. 8 which shows a conventional hydraulic control system comprising a torque converter 1 attached to the engine through the flexible engine plate, and rotating at engine speed for transmitting power of the engine to an input shaft of the transmission gear mechanism, a damper clutch control valve 2 for controlling the application and release of a damper clutch to increase the power train efficiency inside the torque converter 1, a regulator valve 5 for regulating the output hydraulic pressure of the hydraulic pump 4 according to the automatic transmission requirements, and a reducing valve 6 for stably regulating the supply of the hydraulic pressure to a solenoid valve and the damper clutch control valve 2.
A manual valve 7, which is connected to an outlet of the hydraulic pump 4 and provided with the hydraulic pressure, is designed to deliver the line pressure to the regulator valve 5 and a shift control valve. In the manual valve 7, lands are changed according to the position of a shift selector lever.
A shift control valve 8, which is operated in response to two shift control solenoid valves A and B controlled by a TCU (Transmission Control Unit), is designed to selectively transmit the hydraulic pressure through a first-second speed shift valve 9, an end clutch valve 10, a second-third and third-fourth speed shift valve 11, and a rear clutch exhaust valve 12 to a front clutch 13, a rear clutch 14, a low-reverse brake 15, a kick down servo brake 16, an end clutch 17, and the like. An N-D control valve 18 is connected to the rear clutch 14. An N-R control valve 19 is connected to the first-second speed shift valve so as to reduce the impact caused by the shift.
Also, a pressure control solenoid valve 20 is connected to a pressure control valve 21 to reduce the shock produced by the control at the time of shifting.
According to the location of a valve spool within the shift control valve 8, which is controlled by the shift control solenoid valves
REFERENCES:
patent: 5010788 (1991-04-01), Sugano et al.
patent: 5012700 (1991-05-01), Takada et al.
patent: 5086672 (1992-02-01), Kato et al.
Hyundai Motor Co.
Ta Khoi Q.
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